Force parallelogram rule demonstration instrument

Abstract

The utility model is suitable for the technical field of teaching instruments, and provides a force parallelogram rule demonstration instrument, which comprises a guide wheel and a spring dynamometer which are arranged on a plate frame through a mounting frame, the dial is assembled on the plate frame and is used for measuring the angle of the parallelogram; the fine line is arranged on the dial, the guide wheel and the spring dynamometer; the rubber strip is arranged on the fine line and the dial, and a weight is arranged on the rubber strip. The force parallelogram rule demonstration instrument provided by the scheme can vividly carry out teaching demonstration on the parallelogram rule, and the teaching demonstration effect is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the teaching instrument technical field especially relates to a force parallelogram rule demonstration instrument. BACKGROUND

[0002] The parallelogram is two groups of opposite sides respectively parallel quadrilateral. In other words, if a quadrilateral, there are two groups of opposite sides respectively parallel, then this quadrilateral is parallelogram.

[0003] In physics, the parallelogram rule is mainly used for the synthesis and decomposition of force, for example, when two forces act on the same object, the resultant force of the two forces can be obtained by the parallelogram rule. Similarly, a force can also be decomposed into two or more component forces, which are equivalent to the original force in effect. In the process of teaching the parallelogram rule, the teachers currently still draw pictures on the blackboard to demonstrate, the demonstration effect is poor, and the teaching effect is reduced. UTILITY MODEL CONTENT

[0004] The utility model provides a force parallelogram rule demonstration instrument, aims at solving the problem of poor teaching effect of the parallelogram rule proposed in the above background technology.

[0005] To solve the above problems, the utility model is realized in this way, a force parallelogram rule demonstration instrument, comprising: guide pulley and spring dynamometer are arranged on the board frame through the mounting frame;Scale disc is assembled on the board frame and used for measuring the angle of parallelogram;Thin line is arranged on the scale disc, the guide pulley and the spring dynamometer;Rubber strip is arranged on the thin line and the scale disc, and the rubber strip is provided with a weight.

[0006] Preferably, the scale disc is fixedly installed with a coordinate rod, and the board frame is provided with a coordinate paper for referencing the use coordinate position of the scale disc.

[0007] Preferably, two connecting rods are symmetrically fixedly installed on the board frame, two connecting seats are symmetrically fixedly installed on the two mounting frames, the connecting seat and the connecting rod are slidingly connected, and the connecting rod and the connecting seat are provided with an adjusting mechanism for adjusting the use position of the mounting frame.

[0008] Preferably, the adjusting mechanism comprises: an installation cavity is opened in the connecting seat;A positioning rod is slidingly installed in the installation cavity, a stop block is fixedly sleeved on the positioning rod, and a spring is sleeved on the positioning rod;A plurality of positioning grooves are opened in the connecting rod, and the plurality of positioning grooves are connected with the end of the positioning rod.

[0009] Preferably, two ends of the two connecting rods are fixedly provided with threaded blocks, and a plurality of threaded blocks are respectively threadedly provided with nuts.

[0010] Preferably, the plate frame and the dial are provided with a fixing mechanism for fixing the dial on the plate frame, and the fixing mechanism comprises: an anode magnet arranged on the plate frame; and a cathode magnet arranged on the dial, the cathode magnet and the anode magnet being matched.

[0011] Preferably, the bottom end of the rubber strip and the bottom end of the weight are provided with connecting rings, and a plurality of the weights are provided with hooks matched with the weights.

[0012] Compared with the related art, the parallelogram rule demonstration instrument for force has the following beneficial effects:

[0013] Compared with the prior art, the parallelogram rule demonstration instrument for force can vividly and visually demonstrate the parallelogram rule, and effectively improves the teaching demonstration effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a front view structural schematic diagram of the parallelogram rule demonstration instrument for force provided by the utility model;

[0015] Figure 2 is a front view structural schematic diagram of the utility model;

[0016] Figure 3 is Figure 2 is an enlarged structural schematic diagram of the A part shown in the figure;

[0017] Figure 4 is Figure 2 is an enlarged structural schematic diagram of the B part shown in the figure;

[0018] Figure 5 is a front view structural schematic diagram of the plate frame, the dial, the coordinate rod, the anode magnet and the cathode magnet in the utility model.

[0019] Fig. 1 plate frame; 2 mounting frame; 3 guide wheel; 4 spring dynamometer; 5 dial; 6 fine wire; 7 rubber strip; 8 weight; 9 coordinate rod; 10 coordinate paper; 11 connecting rod; 12 connecting seat; 13 mounting cavity; 14 positioning rod; 15 stop block; 16 spring; 17 positioning groove; 18 threaded block; 19 nut; 20 anode magnet; 21 cathode magnet; 22 connecting ring; 23 hook. DETAILED DESCRIPTION

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the present application is not limited to the examples provided and illustrated herein which are intended as illustrations only and not limitations; unless otherwise indicated, the terms "comprising," "comprises" and any variations thereof as used in connecting the present application are intended to be open-ended and to mean that the applications so described can include one or more items, but not excluding others. Terms "first," "second," and the like, as used in to describe various elements in the specification, are generally not intended to indicate relative importance or a particular order but are used to distinguish one element from another. The terms "inner," "outer," "left," "right," and the like describe the orientation or position as shown in the figures and are used for convenience in describing the present application and its possible embodiments to assist in understanding the application without limiting it; therefore, it cannot be understood as limiting the present application to a particular orientation, configuration and operation, and thus cannot be understood as a limitation of the present application.

[0021] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely possible embodiments of the application and are not a limitation on the scope of the application. It is expressly understood that the embodiments described herein are merely possible embodiments of the application and are not a limitation on the scope of the application. It is expressly understood that the embodiments described herein are merely possible embodiments of the application and are not a limitation on the scope of the application.

[0022] The utility model discloses an embodiment of a force parallelogram rule demonstration instrument, as shown in Figures 1-5 The force parallelogram rule demonstration instrument includes a guide wheel 3 and a spring dynamometer 4 arranged on a plate frame 1 through a mounting frame 2; a scale disc 5 is assembled on the plate frame 1 and used for measuring the angle of a parallelogram; a fine line 6 is arranged on the scale disc 5, the guide wheel 3 and the spring dynamometer 4; a rubber strip 7 is arranged on the fine line 6 and the scale disc 5, and a weight 8 is arranged on the rubber strip 7.

[0023] In the embodiment, when the parallelogram rule demonstration teaching is carried out, one end of the thin line 6 is connected with the spring dynamometer 4 on one mounting frame 2, then the thin line 6 is passed through the guide wheel 3 on the mounting frame 2, then the thin line 6 is passed through the guide wheel 3 on the other mounting frame 2, and the other end of the thin line 6 is connected with the spring dynamometer 4 on the mounting frame 2, and the rubber strip 7 is connected with the thin line 6, the weight 8 is placed on the rubber strip 7 according to requirements, during the demonstration, the demonstrator records the reading on the spring dynamometer 4, and moves the scale disc 5 according to actual requirements, and the scale disc 5 is centered on the weight 8, the angle between the two ends of the thin line with the weight 8 as the vertical line can be read, and when recording, the four marks O, a, b and c are drawn on the coordinate paper 10 with a pencil, the position behind the knot is O, the positions behind the three thin lines are a, b and c, the coordinate paper 10 is taken off and is arranged along the directions of Oa, Ob and Oc to determine the scale, and the forces Fa and Fb are drawn on Oa and Ob with O as the origin according to the readings of the two spring dynamometers 4, the resultant force F is drawn according to the parallelogram rule of forces, and F1 is drawn along the direction of cO with O as the origin according to the gravity of the weight 8, if F and F1 are equal in size and same in direction within the error range, the parallelogram rule of the synthesis of the two concurrent forces can be verified, the demonstration teaching work of the parallelogram rule is completed, during the demonstration, the relative positions of the two mounting frames 2, the mass of the weight 8 and the position of the weight 8 can be changed according to actual requirements, the angle between the two adjacent sides of the parallelogram and the size of the force of the two adjacent sides can be changed, and the actual teaching requirements can be better met, the teaching demonstration of the parallelogram rule can be vividly and visually carried out through the whole device, and the teaching demonstration effect is effectively improved.

[0024] In the further preferable embodiment of the utility model, the scale disc 5 is fixedly installed with a coordinate rod 9, and the board frame 1 is provided with a coordinate paper 10 for referencing the use coordinate position of the scale disc 5.

[0025] In the embodiment, the thin line 6 and the rubber strip 7 are conveniently connected through the coordinate rod 9, and the use coordinate position of the scale disc 5 on the board frame 1 is conveniently referenced through the coordinate paper 10.

[0026] In the further preferable embodiment of the utility model, the board frame 1 is symmetrically fixedly installed with two connecting rods 11, and the two mounting frames 2 are symmetrically fixedly installed with connecting seats 12, the connecting seat 12 and the connecting rod 11 are slidingly connected, and the connecting rod 11 and the connecting seat 12 are provided with an adjusting mechanism for adjusting the use position of the mounting frame 2.

[0027] In the embodiment, the mounting frame 2 is conveniently installed on the board frame 1 through the connecting rod 11 and the connecting seat 12, the use position of the mounting frame 2 can be adjusted through the adjusting mechanism, and the connecting seat 12 can be fixed on the connecting rod 11.

[0028] The adjusting mechanism comprises: an installation cavity 13 formed on the connecting seat 12; a positioning rod 14 slidably installed in the installation cavity 13, a stopper 15 is fixedly sleeved on the positioning rod 14, and a spring 16 is sleeved on the positioning rod 14; a plurality of positioning grooves 17 are formed on the connecting rod 11, and the plurality of positioning grooves 17 are connected with the end of the positioning rod 14.

[0029] In the embodiment, when the relative use positions of the two mounting racks 2 and the guide wheels 3 need to be adjusted, the experimental demonstration personnel pull the positioning rod 14 on the connecting seat 12 at both ends of the mounting rack 2 to drive the stopper 15 to compress the spring 16, the positioning rod 14 is moved and the corresponding positioning groove 17 is disconnected, then the position of the connecting seat 12 on the connecting rod 11 is moved, after the position is adjusted, the position of the connecting seat 12 on the connecting rod 11 is fine adjusted, that is, the corresponding positioning groove 17 is adjusted to one side of the positioning rod 14, then the positioning rod 14 is released, at this time, the spring 16 is reset, so that the end of the positioning rod 14 is connected with the corresponding positioning groove 17, thereby the use position of the mounting rack 2 after adjustment is fixed, and then it is convenient to change the angle of the two adjacent sides of the parallelogram and the size of the force of the two adjacent sides according to actual experimental demonstration requirements, so that the students are taught and demonstrated more vividly and the actual teaching requirements are better met, and the teaching effect is effectively improved.

[0030] In the further preferred embodiment of the utility model, threaded blocks 18 are fixedly installed at both ends of the two connecting rods 11, and nuts 19 are threadedly installed on the threaded blocks 18.

[0031] In the embodiment, when the guide wheels 3 and the spring dynamometer 4 on the mounting rack 2 need to be disassembled from the plate rack 1 for maintenance, the nuts 19 are rotated to separate the nuts 19 and the threaded blocks 18, then the experimental demonstration personnel operate the positioning mechanism to disconnect and fix the connecting rod 11 and the connecting seat 12, so that the connecting seat 12 can be disassembled from the connecting rod 11, which is convenient and simple to operate and is more flexible to use.

[0032] In the further preferred embodiment of the utility model, the plate rack 1 and the dial 5 are provided with a fixing mechanism for fixing the dial 5 on the plate rack 1, and the fixing mechanism comprises: an anode magnet 20 arranged on the plate rack 1; and a cathode magnet 21 arranged on the dial 5, wherein the cathode magnet 21 is matched with the anode magnet 20.

[0033] In the embodiment, when the using position of the dial 5 on the plate frame 1 needs to be adjusted, the dial 5 is pulled to separate the cathode magnet 21 and the anode magnet 20, and after the placing position of the dial 5 on the plate frame 1 is determined, the cathode magnet 21 on the dial 5 and the anode magnet 20 on the plate frame 1 are adsorbed and fixed.

[0034] In the further preferred embodiment of the utility model, the bottom end of the rubber band 7 and the bottom end of the weight 8 are provided with connecting rings 22, and the weights 8 are provided with hooks 23, and the hooks 23 are connected with the weights 8.

[0035] In the embodiment, the hooks 23 and the connecting rings 22 are matched with each other, so that the weights 8, the rubber band 7 and the weights 8 are connected with each other.

[0036] In summary, compared with the related art, the whole device can vividly demonstrate the parallelogram rule, and effectively improve the teaching demonstration effect.

[0037] In the several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways.

[0038] The above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit the protection scope of the utility model. Obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still make modifications to the features of the embodiments of the utility model according to the circumstances without creative labor, such as mutual combination, addition or deletion or other adjustments, so as to obtain different other technical solutions which do not deviate from the concept of the utility model. These technical solutions also belong to the scope of protection of the utility model.

Claims

1. A force parallelogram law demonstration device, characterized in that, include: Guide wheels and spring force gauges are mounted on the plate frame using a mounting bracket; A scale mounted on the plate frame for measuring the angles of a parallelogram; Fine lines are set on the dial, the guide wheel, and the spring balance; A rubber strip is provided on the thin line and the dial, and a weight is provided on the rubber strip.

2. The parallelogram law demonstration device for forces as described in claim 1, characterized in that, A coordinate rod is fixedly installed on the dial, and coordinate paper is provided on the plate frame for reference of the coordinate position of the dial.

3. The parallelogram law demonstration device for forces as described in claim 1, characterized in that, Two connecting rods are symmetrically fixedly installed on the plate frame, and connecting seats are symmetrically fixedly installed on both mounting brackets. The connecting seats and the connecting rods are slidably connected, and the connecting rods and the connecting seats are provided with adjustment mechanisms for adjusting the usage position of the mounting brackets.

4. The parallelogram law demonstration device for forces as described in claim 3, characterized in that, The adjustment mechanism includes: A mounting cavity is formed on the connector; A positioning rod is slidably installed in the mounting cavity, a stop block is fixedly sleeved on the positioning rod, and a spring is sleeved on the positioning rod; Multiple positioning grooves are formed on the connecting rod, and each of the multiple positioning grooves is adapted to be connected to the end of the positioning rod.

5. The parallelogram law demonstration device for forces as described in claim 3, characterized in that, Both ends of the two connecting rods are fixedly installed with threaded blocks, and nuts are threadedly installed on the multiple threaded blocks respectively.

6. The parallelogram law demonstration device for forces as described in claim 1, characterized in that, The plate frame and the dial are provided with a fixing mechanism for fixing the dial to the plate frame, the fixing mechanism including: Anode magnets are mounted on the plate frame; A cathode magnet is disposed on the dial, and the cathode magnet is adapted to the anode magnet.

7. The parallelogram law demonstration device for forces as described in claim 1, characterized in that, Both the bottom end of the rubber strip and the bottom end of the weight are provided with a connecting ring, and each of the weights is provided with a hook, which is adapted to be connected to the weight.

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