Projection demonstration mechanism

Abstract

The utility model discloses a projection demonstration mechanism, which belongs to the field of projection demonstration and comprises a working table, a turntable is mounted on the upper surface of the working table through a bearing, a friction rubber pad is glued on the upper surface of the turntable, four clamping grooves are uniformly formed in the lower surface of the turntable, and the four clamping grooves mutually form 90 degrees. A mounting groove is formed in the upper surface of the workbench and located below the rotary disc, a clamping strip is slidably mounted on the upper portion of the interior of the mounting groove, the section of the clamping strip is semicircular, the top of the clamping strip is matched with the interior size of the clamping groove, and springs are symmetrically arranged in the mounting groove. The rotary table is arranged on the rear plate, the rotary table is irradiated through the light emitting source, the light is projected to the rear plate, observation and learning of geometric projection are more convenient, meanwhile, when the angle of the rotary table is adjusted, it can be guaranteed that slight clamping occurs every time the rotary table rotates by 90 degrees, adjustment of the angle of an exhibit is facilitated, and observation at different angles is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of projection demonstration, and more specifically, to a projection demonstration mechanism. Background Art

[0002] When exhibits are used for teaching or geometric research, it is necessary to project the exhibits from different angles to obtain geometric figures of different views (such as six views). At present, when rotating exhibits, they are usually placed on a turntable and the rotation angle of the exhibits is controlled by manual rotation. However, this method cannot guarantee that each rotation is exactly 90 degrees, which will affect the geometric projection effect of some exhibits. Utility Model Content

[0003] 1. Technical problems to be solved

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a projection demonstration mechanism, which can quickly realize the projection of exhibits at different angles and facilitate the study of geometric projection.

[0005] 2. Technical solution

[0006] In order to solve the above problems, the utility model adopts the following technical solutions. A projection demonstration mechanism includes a workbench, a turntable is installed on the upper surface of the workbench through a bearing, a friction rubber pad is glued to the upper surface of the turntable, four card slots are evenly opened on the lower surface of the turntable, and the four card slots are 90 degrees to each other, and a mounting groove is opened on the upper surface of the workbench, and the mounting groove is placed below the turntable. A card strip is slidably installed on the upper part of the mounting groove, and the cross-section of the card strip is semicircular, and the top of the card strip is adapted to the internal size of the card slot, and springs are symmetrically arranged inside the mounting groove, and the tops of the two springs are in contact with the lower surface of the card strip.

[0007] Furthermore, a storage groove is provided on the front side of the upper surface of the workbench, a rotating seat is installed at one end of the storage groove through a pin shaft, and the installation axis of the rotating seat is located at the center of the workbench.

[0008] Furthermore, a slide rod is slidably installed at the end of the rotating seat, a locking bolt A is screwed on the top of the end of the rotating seat, a support plate is arranged at the end of the slide rod away from the rotating seat, and a support tube is vertically arranged on the top of the support plate.

[0009] Furthermore, an adjustment column is slidably installed above the support tube, a holder is provided on the top of the adjustment column, and a light source is engaged with the inner side of the holder.

[0010] Furthermore, a limiting groove is provided on the outer arc surface of the adjustment column, and a locking bolt B is screwed on one side of the top of the support tube. The locking bolt B passes through the main body of one side of the support tube, and the end of the locking bolt B is placed inside the limiting groove.

[0011] Furthermore, a rear plate is provided on the rear side of the upper surface of the workbench.

[0012] Furthermore, pillars are symmetrically arranged at the bottom of the workbench, and bases are screwed together at the bottoms of a plurality of the pillars, and a level ruler is embedded on the upper surface of the workbench.

[0013] 3. Beneficial effects

[0014] Compared with the prior art, the advantages of the present invention are as follows: the present invention provides a projection demonstration mechanism, which places the exhibit on a rotatable turntable and illuminates it through a light source so that it is projected onto the back plate, making it more convenient to observe and learn about geometric projection. At the same time, when the turntable is adjusted in angle, it can be ensured that there will be a slight freeze every 90 degrees of rotation, so as to facilitate the adjustment of the exhibit angle, ensure the accuracy of the projection direction when observing at different angles, and ensure the intuitiveness of the teaching demonstration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of the rotating seat and the base of the utility model;

[0017] Figure 3 This is a bottom view of the structure of the rotating seat of the utility model;

[0018] Figure 4 It is a schematic diagram of the support tube and the light-emitting body installation structure of the utility model.

[0019] Explanation of the numbers in the figure: 1. Workbench; 2. Pillar; 3. Base; 4. Back plate; 5. Level; 6. Storage slot; 7. Rotating seat; 8. Locking bolt A; 9. Sliding rod; 10. Support plate; 11. Support cylinder; 12. Adjusting column; 13. Clamping seat; 14. Light source; 15. Limiting slot; 16. Locking bolt B; 17. Turntable; 18. Friction rubber pad; 19. Clamping slot; 20. Mounting slot; 21. Clamping strip; 22. Spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0021] Embodiment 1:

[0022] See also Figure 1-4 A projection demonstration mechanism includes a workbench 1, a turntable 17 is installed on the upper surface of the workbench 1 through a bearing, and a friction rubber pad 18 is glued to the upper surface of the turntable 17 to increase the friction with the exhibits, prevent the exhibits from falling off during the rotation of the turntable 17, and ensure that the exhibits can rotate with the turntable 17.

[0023] Please refer to Figure 3 As shown, four slots 19 are evenly formed on the lower surface of the turntable 17 , and the four slots 19 are 90° apart from each other, so as to ensure that the angle can be limited by the slots 19 each time the angle is adjusted.

[0024] Please refer to Figure 2 As shown, a mounting groove 20 is provided on the upper surface of the workbench 1, and the position of the mounting groove 20 corresponds to the position of the annular projection of the four card slots 19. The mounting groove 20 is placed below the turntable 17, and a card strip 21 is slidably installed on the upper part of the mounting groove 20. The cross-section of the card strip 21 is semicircular. The semicircular card strip 21 can ensure that scales appear when rotating 90 degrees, but the turntable 17 will not be limited too much. The top of the card strip 21 is adapted to the internal size of the card slot 19, and springs 22 are symmetrically arranged inside the mounting groove 20. The tops of the two springs 22 are in contact with the lower surface of the card strip 21, and the springs 22 ensure that the card strip 21 always has an upward force.

[0025] Please refer to Figure 1 As shown, a storage groove 6 is opened on the front side of the upper surface of the workbench 1, and a rotating seat 7 is installed at one end of the storage groove 6 through a pin shaft. The rotating seat 7 is adapted to the internal size of the storage groove 6 to ensure that the rotating seat 7 can be retracted into the storage groove 6 when not in use, and the rotating seat 7 can only rotate 90 degrees. The installation axis of the rotating seat 7 is at the center position of the workbench 1 to ensure that after the rotating seat 7 rotates outward, it can be on the same horizontal line with the exhibits on the upper surface of the turntable 17.

[0026] Please refer to Figure 4As shown, a slide bar 9 is slidably installed at the end of the rotating seat 7, and a locking bolt A8 is screwed on the top of the end of the rotating seat 7, which can adjust the relative distance, and then adjust the horizontal distance between the light source 14 and the exhibit to adjust the focal length of the light source 14. A support plate 10 is provided at the end of the slide bar 9 away from the rotating seat 7, and a support cylinder 11 is vertically provided on the top of the support plate 10. An adjustment column 12 is slidably installed above the support cylinder 11, and the adjustment column 12 can adjust the height of the light source 14. A holder 13 is provided on the top of the adjustment column 12, and the light source 14 is engaged on the inner side of the holder 13.

[0027] Among them, a limiting groove 15 is provided on the outer arc surface of the adjustment column 12, and a locking bolt B16 is screwed on one side of the top of the support tube 11. The locking bolt B16 passes through the main body of one side of the support tube 11, and the end of the locking bolt B16 is placed on the inner side of the limiting groove 15. The mutual cooperation between the locking bolt B16 and the limiting groove 15 can ensure the fixation of the angle of the light source 14 and the fixation of the height.

[0028] Please refer to Figure 1 As shown, a rear plate 4 is provided on the rear side of the upper surface of the workbench 1 to form a projection, pillars 2 are symmetrically provided at the bottom of the workbench 1, bases 3 are screwed on the bottom of multiple pillars 2, and a level ruler 5 is embedded on the upper surface of the workbench 1 to facilitate adjustment of the levelness of the workbench 1.

[0029] When in use: first adjust the parallelism of the upper surface of the workbench 1, which can be done by observing the bubble position inside the level ruler 5, and then move it by rotating the base 3 at different angles. Before performing a demonstration, the parallelism of the surface of the workbench 1 must be ensured, and then the exhibit to be projected is placed on the upper surface of the turntable 17, and the friction with the friction rubber pad 18 ensures that the exhibit remains stable during the rotation of the turntable 17, and then rotates the rotating seat 7 to make it perpendicular to the front edge of the workbench 1, and adjust the distance between the light source 14 and the exhibit by sliding the slide bar 9 and the rotating seat 7, and then fix it with the locking bolt A8, and then adjust the height of the adjustment column 12 relative to the support tube 11, and judge the relative height of the light source 14 by the scale on the surface of the adjustment column 12, so that the height of the light source 14 is consistent with the exhibit, because the locking bolt B16 is in contact with the limit groove 1 5 cooperate with each other to ensure that the direction of the light source 14 will not change, and the adjustment column 12 is locked by the limit groove 15 to ensure the stability of the light source 14. The illumination of the exhibit by the light source 14 will be projected onto the surface of the rear plate 4 to obtain the front projection of the exhibit. Before the demonstration, the surface of the turntable 17 is properly rotated so that the card strip 21 can be placed in one of the card slots 19 to ensure its initial position. Due to the existence of the spring 22, the card strip 21 is always placed at the top of the stroke. Since the top of the card strip 21 is arc-shaped, it can rotate when a rotational force is applied to the turntable 17. When it is rotated to 90 degrees, the card strip 21 is placed in another card slot 19 to ensure that when the turntable 17 drives the exhibit to rotate, there will be a jam when it is rotated to 90 degrees, so as to facilitate the projection of different viewing angles during the projection demonstration.

[0030] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A projection demonstration mechanism, comprising a workbench (1), characterized in that: A turntable (17) is mounted on the upper surface of the workbench (1) via a bearing. A friction rubber pad (18) is glued to the upper surface of the turntable (17). Four slots (19) are evenly arranged on the lower surface of the turntable (17). The four slots (19) are 90 degrees to each other. A mounting slot (20) is arranged on the upper surface of the workbench (1). The mounting slot (20) is placed below the turntable (17). A clip strip (21) is slidably mounted on the upper part of the mounting slot (20). The cross section of the clip strip (21) is semicircular. The top of the clip strip (21) matches the inner size of the clip slot (19). Springs (22) are symmetrically arranged inside the mounting slot (20). The tops of the two springs (22) are in contact with the lower surface of the clip strip (21).

2. A projection demonstration mechanism according to claim 1, characterized in that: A receiving groove (6) is provided on the front side of the upper surface of the workbench (1), and a rotating seat (7) is installed at one end of the receiving groove (6) via a pin shaft, and the installation axis of the rotating seat (7) is located at the center of the workbench (1).

3. A projection demonstration mechanism according to claim 2, characterized in that: A slide rod (9) is slidably mounted on the end of the rotating seat (7), a locking bolt A (8) is screwed on the top of the end of the rotating seat (7), a support plate (10) is arranged at the end of the slide rod (9) away from the rotating seat (7), and a support tube (11) is vertically arranged on the top of the support plate (10).

4. A projection demonstration mechanism according to claim 3, characterized in that: An adjustment column (12) is slidably mounted above the support tube (11), a clamping seat (13) is arranged on the top of the adjustment column (12), and a light source (14) is clamped inside the clamping seat (13).

5. A projection demonstration mechanism according to claim 4, characterized in that: The outer arc surface of the adjustment column (12) is provided with a limiting groove (15), and a locking bolt B (16) is screwed on one side of the top of the support tube (11). The locking bolt B (16) passes through a main body of one side of the support tube (11), and the end of the locking bolt B (16) is placed inside the limiting groove (15).

6. A projection demonstration mechanism according to claim 5, characterized in that: A rear plate (4) is arranged on the rear side of the upper surface of the workbench (1).

7. A projection demonstration mechanism according to claim 1, characterized in that: The bottom of the workbench (1) is symmetrically provided with pillars (2), the bottoms of a plurality of the pillars (2) are all screwed with bases (3), and the upper surface of the workbench (1) is inlaid with a level ruler (5).

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