Object shadow length change demonstration instrument

Abstract

The utility model relates to the technical field of demonstration instruments, in particular to an object shadow length change demonstration instrument which comprises a supporting arm, a sliding groove is formed in the lower surface of the inner side of the supporting arm, a sliding shaft is arranged in the sliding groove in a sliding mode, a demonstration board is fixedly arranged on one side of the sliding shaft, and a plurality of annular grooves are formed in the surface of the upper end of the demonstration board. A sliding baffle in a storage box is inserted into an annular groove, and a motor is started to drive a lead screw to rotate, so that a threaded sleeve is driven to move, a sliding sleeve is driven to slide on the surface of a sliding rod, a light source is driven to move, and the direct solar radiation condition is presented; the conclusion that the solar altitude is gradually decreased from a direct solar radiation point to all directions, the shadow length of an object is gradually increased from the direct solar radiation point to all directions, the noon solar altitude is gradually decreased from the latitude of the direct solar radiation point to two poles, and the noon solar altitude and the shadow length of two wefts with the same degree from the latitude of the direct solar radiation point are consistent is obtained.

Description

Technical Field

[0001] This utility model relates to the field of demonstration instrument technology, specifically to a demonstration instrument for the change of shadow length of an object. Background Technology

[0002] The shadow length change demonstrator can simulate the changing characteristics of an object's shadow length by observing the effects of direct sunlight. By demonstrating direct sunlight, it can be deduced that the solar altitude angle decreases from the point of direct sunlight in all directions; the shadow length decreases from the point of direct sunlight in all directions; the noon solar altitude angle decreases from the latitude of the point of direct sunlight towards the poles; and the noon solar altitude angle is the same at two latitudes equidistant from the point of direct sunlight.

[0003] Knowledge about Earth's movements requires a high level of spatial reasoning ability from students. Currently, with the limitations of educational technology, teachers often rely on multimedia presentations and verbal explanations, which can be difficult for some students to understand and absorb. Therefore, a demonstrator of changes in shadow length is needed to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a demonstration device for the change of shadow length of an object, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A shadow length change demonstrator includes a support arm, a groove on the lower inner surface of the support arm, a sliding shaft slidingly disposed inside the groove, a demonstration board fixedly disposed on one side of the sliding shaft, a plurality of annular grooves on the upper surface of the demonstration board, sliding baffles slidingly disposed on the surface of the annular grooves, a sliding rod fixedly disposed on the inner side of the support arm, a sliding sleeve slidingly disposed on the surface of the sliding rod, a motor fixedly disposed on one side of the support arm, a lead screw driven at the output end of the motor, a threaded sleeve threadedly connected to the surface of the lead screw, and a light source fixedly disposed at the lower end of the threaded sleeve.

[0007] As a preferred embodiment of this utility model, the threaded sleeve and the sliding sleeve are fixedly connected.

[0008] As a preferred embodiment of this utility model, the inner side of the support arm is provided with an L-shaped groove, and a limiting rod is fixedly provided on the side of the demonstration board, with the limiting rod corresponding to the L-shaped groove.

[0009] As a preferred embodiment of this utility model, a storage box is slidably provided inside the demonstration board.

[0010] As a preferred embodiment of this utility model, the upper end of the sliding baffle is a rectangular baffle, and the bottom end is an arc-shaped slider.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, by inserting the sliding baffle inside the storage box into the annular groove, starting the motor to drive the lead screw to rotate, thereby driving the threaded sleeve to move, and at the same time driving the sliding sleeve to slide on the surface of the sliding rod, thereby driving the light source to move, presenting the condition of direct sunlight, it is concluded that the solar altitude angle decreases from the point of direct sunlight to all directions, the shadow length of an object increases from the point of direct sunlight to all directions, the noon solar altitude angle decreases from the latitude of the point of direct sunlight to the poles, and the noon solar altitude angle and shadow length are the same for two latitudes that are equal in degree from the latitude of the point of direct sunlight;

[0013] 2. In this utility model, when storing, the demonstration board is rotated by the sliding shaft, so that the limiting rod at the end of the demonstration board is locked into the limiting rod, making it easy to carry. In class, this demonstration device can be used to allow students to observe intuitively, draw conclusions and reinforce the following: the solar altitude angle decreases from the subsolar point in all directions; the shadow length of an object increases from the subsolar point in all directions; the noon solar altitude angle decreases from the latitude of the subsolar point towards the poles; and the noon solar altitude angle and shadow length are the same for two latitudes with the same degree of distance from the subsolar point. At the same time, it can create a good classroom atmosphere and stimulate students' enthusiasm for learning. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional unfolded structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the overall three-dimensional storage structure of this utility model;

[0016] Figure 3 This is a top view of the overall structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the overall front structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the overall side structure of this utility model.

[0019] In the diagram: 1. Support arm; 2. L-shaped groove; 3. Slide groove; 4. Sliding shaft; 5. Annular groove; 6. Sliding baffle; 7. Demonstration board; 8. Storage box; 9. Limiting rod; 10. Motor; 11. Lead screw; 12. Light source; 13. Threaded sleeve; 14. Sliding sleeve; 15. Sliding rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0025] Please see Figure 1-5 This utility model provides a technical solution:

[0026] A demonstration device for changing the length of an object's shadow includes a support arm 1. A groove 3 is provided on the lower inner surface of the support arm 1. A sliding shaft 4 is slidably mounted inside the groove 3. A demonstration board 7 is fixed to one side of the sliding shaft 4. Several annular grooves 5 are provided on the upper surface of the demonstration board 7. Sliding baffles 6 are slidably mounted on the surface of the annular grooves 5. A sliding rod 15 is fixed to the inner side of the support arm 1. A sliding sleeve 14 is slidably mounted on the surface of the sliding rod 15. A motor 10 is fixed to one side of the support arm 1. A lead screw 11 is driven at the output end of the motor 10. A threaded sleeve 13 is threaded onto the surface of the lead screw 11. A light source 12 is fixed to the lower end of the threaded sleeve 13. The device works by inserting the sliding baffle 6 inside the storage box 8 into the annular grooves 5. Slot 5, starting motor 10 drives lead screw 11 to rotate, thereby driving threaded sleeve 13 to move, and at the same time driving sliding sleeve 14 to slide on the surface of sliding rod 15, thereby driving light source 12 to move, presenting the state of direct sunlight, and deducing that the solar altitude angle decreases from the point of direct sunlight to all directions, the shadow length of objects increases from the point of direct sunlight to all directions, the noon solar altitude angle decreases from the latitude of the point of direct sunlight to the poles, and the noon solar altitude angle and shadow length are the same for two latitudes with the same degree of distance from the latitude of the point of direct sunlight. When storing, the demonstration board 7 is rotated by sliding shaft 4, so that the limiting rod 9 at the end of the demonstration board 7 is locked into the limiting rod 9 for easy carrying.

[0027] As an example of this utility model, the threaded sleeve 13 and the sliding sleeve 14 are fixedly connected.

[0028] As an example of this utility model, the inner side of the support arm 1 is provided with an L-shaped groove 2, and the side of the demonstration board 7 is fixedly provided with a limiting rod 9, which is correspondingly set with the L-shaped groove 2.

[0029] As an example of this utility model, a storage box 8 is slidably provided inside the demonstration board 7.

[0030] As an example of this utility model, the upper end of the sliding baffle 6 is a rectangular baffle, and the bottom is an arc-shaped slider.

[0031] Working principle: When in use, by inserting the sliding baffle 6 inside the storage box 8 into the annular groove 5, the motor 10 is started to drive the lead screw 11 to rotate, thereby driving the threaded sleeve 13 to move. At the same time, the sliding sleeve 14 slides on the surface of the sliding rod 15, thereby driving the light source 12 to move, presenting the condition of direct sunlight. It is concluded that the solar altitude angle decreases from the point of direct sunlight to all directions, the shadow length of an object increases from the point of direct sunlight to all directions, the noon solar altitude angle decreases from the latitude of the point of direct sunlight to the poles, and the noon solar altitude angle and shadow length are the same for two latitudes with the same degree of distance from the latitude of the point of direct sunlight. When storing, the sliding shaft 4 drives the demonstration board 7 to rotate, thereby causing the limiting rod 9 at the end of the demonstration board 7 to be locked into the limiting rod 9 for easy carrying.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A demonstration device for the change of shadow length of an object, comprising a support arm (1), characterized in that: The lower inner surface of the support arm (1) is provided with a groove (3), and a sliding shaft (4) is slidably provided inside the groove (3). A demonstration board (7) is fixedly provided on one side of the sliding shaft (4). Several annular grooves (5) are provided on the upper surface of the demonstration board (7). A sliding baffle (6) is slidably provided on the surface of the annular grooves (5). A sliding rod (15) is fixedly provided on the inner side of the support arm (1). A sliding sleeve (14) is slidably provided on the surface of the sliding rod (15). A motor (10) is fixedly provided on one side of the support arm (1). A lead screw (11) is driven at the output end of the motor (10). A threaded sleeve (13) is threadedly connected to the surface of the lead screw (11). A light source (12) is fixedly provided at the lower end of the threaded sleeve (13).

2. The object shadow length change demonstration device according to claim 1, characterized in that: The threaded sleeve (13) and the sliding sleeve (14) are fixedly connected.

3. The object shadow length change demonstration device according to claim 2, characterized in that: The support arm (1) has an L-shaped groove (2) on its inner side, and a limiting rod (9) is fixed on the side of the demonstration board (7), with the limiting rod (9) corresponding to the L-shaped groove (2).

4. The object shadow length change demonstration device according to claim 3, characterized in that: The demonstration board (7) has a sliding storage box (8) inside.

5. The object shadow length change demonstration device according to claim 4, characterized in that: The upper end of the sliding baffle (6) is a rectangular baffle, and the bottom is an arc-shaped slider.

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