A teaching aid combination structure for cultivating logical thinking of young children
Patent Information
- Application Number
- CN202611363565.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-04
- Publication Date
- 2026-10-30
AI Technical Summary
[0005]本发明提供一种用于幼儿逻辑思维培养的教具组合结构,可以有效解决上述背景技术中提出的培养幼儿逻辑思维的教具每种分开,使用时需要选用对应的教具,需要专门的箱子或收纳盒进行摆放,存放取用均不方便,不利于幼儿逻辑培养教学的进行,且使用过程中容易遗失散落的问题
1、设置有切换组合组件,从处于上方的教具箱内部抽出教具框,转动教具框,转动采集框内的转接臂,再于旋转槽内转动旋转头,调节功能臂和摄像头的位置,使得摄像头对准双面磁吸板,在幼儿操作时,可通过控制器和外界的控制台相连,并通过网络平台查看幼儿操作状况,并通过播放器语音提示,人工引导幼儿进行操作;
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Figure CN123016740A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of teaching aids technology, specifically to a teaching aid combination structure for cultivating logical thinking in young children. Background Technology
[0002] Developing logical thinking in young children is a gradual process that requires stimulating interest through games and interactions. Educational toys on the market can be broadly categorized into several types, each with its own focus. For example, some emphasize building and spatial imagination with common 3D puzzles, while others emphasize reasoning and problem-solving with magnetic puzzles and Sempel's Logic Dog.
[0003] The patent application with application number CN201610119061.9 mentions "an electronic building block module and an electronic building block teaching aid." The electronic building block modules rely on magnetic splicing. Since they cannot be connected when the magnetic fields are opposite, it can prevent incorrect assembly and is very easy to assemble. Both children and adults can acquire basic electronic knowledge, cultivate logical thinking skills, and develop creative thinking from electronic building block teaching aids.
[0004] However, the teaching aids for cultivating children's logical thinking on the market are all separate. When using them, you need to select the corresponding teaching aid and store them in a special box or storage box. This is inconvenient for storage and retrieval, which is not conducive to the teaching of children's logical thinking. In addition, they are easy to lose or scatter during use. Summary of the Invention
[0005] This invention provides a teaching aid combination structure for cultivating logical thinking in young children. It can effectively solve the problems mentioned in the background art, such as the separate use of each teaching aid for cultivating logical thinking in young children, the need to select the corresponding teaching aid when using it, the need for special boxes or storage boxes for storage, the inconvenience of storage and retrieval, the disadvantage of teaching logical thinking in young children, and the easy loss and scattering during use.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a teaching aid combination structure for cultivating logical thinking in young children, comprising a teaching aid box, wherein the teaching aid box is equipped with a switching combination component, and the switching combination component includes a detachable end plate; The edges of the four teaching aid boxes are hinged together. A detachable end plate is installed at one end of each teaching aid box by screws. One end of the detachable end plate is connected to one end of a folding rod inside the teaching aid box. The other end of the folding rod is hinged to the inside of the control box. A movable sealing plate is hinged to the bottom of one end of the control box. A rotating shaft is installed in the middle of the side of the movable sealing plate. A teaching aid frame is rotatably connected to one end of the rotating shaft. A double-sided magnetic plate is embedded inside the teaching aid frame. An information collection frame is embedded on one side inside the teaching aid frame. A shaft is installed on one side of the disassembly end plate, and a locking rod is installed on the other side of the disassembly end plate. A positioning rod is rotatably connected to the outside of the shaft. A positioning hole is opened on the positioning rod near the locking rod. The length of the shaft is twice the length of the locking rod.
[0007] According to the above technical solution, an adapter arm is rotatably installed at one end of the information collection frame, a rotating groove is opened at one end of the adapter arm, a rotating head is rotatably installed inside the rotating groove, a functional arm is connected to one end of the rotating head, a camera is rotatably installed at one end of the functional arm, and a player is embedded in the middle of the functional arm.
[0008] According to the above technical solution, a controller is installed on one side inside the control box, and a battery box is installed inside the control box near the controller. The camera and player input terminals are electrically connected to the controller output terminal, and the controller input terminal is electrically connected to the battery box output terminal.
[0009] According to the above technical solution, the teaching aid box is symmetrically welded with slide rails inside, and the control box, movable sealing plate and teaching aid frame are provided with support slide grooves at the corresponding slide rails.
[0010] According to the above technical solution, when adjacent teaching aid boxes are perpendicular to each other, the distance between the shaft and the positioning rod of the same disassembly end plate is equal to the distance between the shaft and the positioning rod of the adjacent disassembly end plate.
[0011] According to the above technical solution, the folding rod is composed of two straight rods connected by rotation, and the maximum length of the folding rod is equal to the length of the teaching aid frame.
[0012] According to the above technical solution, a switching support assembly is installed on the outside of the teaching aid box, and the switching support assembly includes an internally threaded shaft tube; The teaching aid box has an internally threaded shaft tube welded to the middle of its side. A turntable box is rotatably sleeved on the outside of the internally threaded shaft tube. A fixing screw is threadedly connected inside the internally threaded shaft tube. An extrusion plate is welded to one end of the fixing screw. A support tube is welded through the turntable box. A support plate is slidably installed inside the support tube. A counterweight box is welded to the bottom of the support plate. A rotating rod is hinged to one end of the counterweight box. A magnetic slider is rotatably connected to one end of the rotating rod. The magnetic slider is slidably installed inside a magnetic rail. A movable support strip is glued to one side of the magnetic rail.
[0013] According to the above technical solution, the turntable box and the support tube are evenly provided with fixed height openings on one side, and the support plate is equipped with arc-shaped spring clips corresponding to the fixed height openings.
[0014] According to the above technical solution, the bottom surface of the counterweight box is provided with an adsorption groove, a suction cup is installed inside the adsorption groove, and an anti-slip pad is adhered to the bottom surface of the counterweight box.
[0015] According to the above technical solution, a protective support box is snapped onto one side of the teaching aid box, and a magnetic piece is embedded in the middle of the other side of the teaching aid box, with the opposite polarities of the magnetic pieces of adjacent teaching aid boxes being opposite.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. It is equipped with a switching combination component. The teaching aid frame can be pulled out from the teaching aid box at the top, the teaching aid frame can be rotated, the adapter arm in the acquisition frame can be rotated, and then the rotating head in the rotating slot can be rotated to adjust the position of the functional arm and the camera so that the camera is aligned with the double-sided magnetic plate. When the child is operating, it can be connected to the external control console through the controller, and the child's operation status can be viewed through the network platform. The child can be manually guided to operate through the voice prompts of the player. The double-sided magnetic board can be used to teach young children to do magnetic puzzles. While cultivating children's logical thinking, it also teaches basic magnetism. After the double-sided magnetic board on the front is assembled, the teaching aid frame is rotated around the pivot to assemble the back side. Similarly, the four teaching aid boxes can be rotated to remove the teaching aid frames from the remaining boxes. Multiple teaching aids are integrated into one teaching aid, and the teaching aid box also has a storage function, making it easy to access, less likely to be lost, and more convenient to operate. The end plate can be removed to replace the battery box inside the control box, or it can be replaced with other types of teaching aids, such as drawing boards or building blocks, making the teaching aids more versatile. After use, the tube composed of four teaching aid boxes is folded, making the hollow tube in the middle flat. This structure is stacked to reduce space occupation, making it more convenient to store and retrieve.
[0017] 2. Equipped with a switching support component, the turntable box rotates around the internal threaded shaft tube under the action of gravity, with the counterweight box facing the ground. The movable support bar and the counterweight box serve as the support structure, and the pulling of the movable support bar expands the support area. When placing the device, the magnetic slider can be pulled along the magnetic rail to change the position of the movable support bar, preventing placement difficulties due to space limitations, making it more adaptable to the space, and improving the stability of the placement. Pulling the support plate along the support tube allows the arc spring to engage with the corresponding height-adjusting slot, thus adjusting the height of the teaching aid for the convenience of children. In summary, when the switching assembly is tubular, it is convenient for children or teachers to operate. The switching support assembly can be adjusted to a suitable height for stable support. When the switching assembly is flat for storage, the switching support assembly can be used to store it, further reducing the space occupied by the switching assembly and making it more convenient to use. Attached Figure Description
[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.
[0019] In the attached diagram: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the switching combination component of the present invention; Figure 3 This is a schematic diagram of the installation structure of the double-sided magnetic suction plate of the present invention; Figure 4 This is a schematic diagram of the installation structure of the positioning rod of the present invention; Figure 5 This is a schematic diagram of the structure of the switching support component of the present invention; Figure 6 This is a schematic diagram of the installation structure of the turntable box of the present invention; Figure 7 This is a schematic diagram of the installation structure of the suction cup of the present invention; Figure 8 This is a schematic diagram of the installation structure of the magnetic rail of the present invention; Numbered in the diagram: 1. Teaching aid box; 2. Switching assembly components; 201. Disassembling end plate; 202. Folding rod; 203. Control box; 204. Movable sealing plate; 205. Rotating shaft; 206. Teaching aid frame; 207. Double-sided magnetic suction plate; 208. Information collection frame; 209. Shaft; 210. Locking rod; 211. Positioning rod; 212. Positioning hole; 213. Adapter arm; 214. Rotating groove; 215. Rotating head; 216. Functional arm; 217. Camera; 218. Player; 219. Controller; 220. Battery box; 221. Slide rail; 222. Supporting slide rail; 3. Switching support components; 301. Internal threaded shaft tube; 302. Turntable box; 303. Fixing screw; 304. Extrusion plate; 305. Support tube; 306. Support plate; 307. Counterweight box; 308. Rotating rod; 309. Magnetic slider; 310. Magnetic rail; 311. Movable support bar; 312. Height-fixing opening; 313. Arc-shaped spring clip; 314. Adsorption groove; 315. Suction cup; 316. Anti-slip pad; 317. Protective support box; 318. Magnetic sheet. Detailed Implementation
[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0021] Example: Figure 1-8As shown, the present invention provides a teaching aid combination structure technical solution for cultivating logical thinking in young children, including a teaching aid box 1. The teaching aid box 1 is equipped with a switching combination component 2. The switching combination component 2 includes a detachable end plate 201, a folding rod 202, a control box 203, a movable sealing plate 204, a rotating shaft 205, a teaching aid frame 206, a double-sided magnetic suction plate 207, an information collection frame 208, a shaft 209, a clamping rod 210, a positioning rod 211, a positioning hole 212, an adapter arm 213, a rotating groove 214, a rotating head 215, a functional arm 216, a camera 217, a player 218, a controller 219, a battery box 220, a slide rail 221, and a support slide groove 222. Four teaching aid boxes 1 are hinged together at their edges. A detachable end plate 201 is screwed onto one end of each teaching aid box 1. One end of the detachable end plate 201 is connected to one end of a folding rod 202 inside the teaching aid box 1. The other end of the folding rod 202 is hinged to the inside of a control box 203. A movable sealing plate 204 is hinged to the bottom of one end of the control box 203. A rotating shaft 205 is installed in the middle of the side of the movable sealing plate 204. One end of the rotating shaft 205 is rotatably connected to a teaching aid frame 206. The folding rod 202 is composed of two straight rods rotatably connected together. The maximum length of 202 is equal to the length of the teaching aid frame 206 to prevent the teaching aid frame 206 from being pulled out excessively and falling. The teaching aid frame 206 is inlaid with a double-sided magnetic plate 207. An information collection frame 208 is inlaid on one side of the teaching aid frame 206. The teaching aid box 1 is symmetrically welded with slide rails 221. The control box 203, the movable sealing plate 204 and the teaching aid frame 206 are provided with support grooves 222 at the corresponding slide rails 221 to facilitate the smooth sliding of the slide rails 221, control box 203, movable sealing plate 204 and teaching aid frame 206. A shaft 209 is installed on one side of the disassembly end plate 201, and a locking rod 210 is installed on the other side of the disassembly end plate 201. A positioning rod 211 is rotatably connected to the outside of the shaft 209. When adjacent teaching aid boxes 1 are perpendicular to each other, the distance between the shaft 209 and the positioning rod 211 of the same disassembly end plate 201 is equal to the distance between the shaft 209 and the positioning rod 211 of the adjacent disassembly end plate 201, which facilitates the support of the teaching aid box 1 to maintain stability. A positioning hole 2 is opened on the positioning rod 211 near the locking rod 210. 12. The length of the shaft 209 is twice the length of the clamp 210. One end of the information collection frame 208 is rotatably mounted with an adapter arm 213. One end of the adapter arm 213 is provided with a rotating groove 214. A rotating head 215 is rotatably mounted inside the rotating groove 214. One end of the rotating head 215 is connected to a functional arm 216. One end of the functional arm 216 is rotatably mounted with a camera 217. A player 218 is embedded in the middle of the functional arm 216 to facilitate monitoring of children's learning status and avoid dangerous situations.
[0022] A controller 219 is installed on one side inside the control box 203. A battery box 220 is installed inside the control box 203 near the controller 219. The input terminals of the camera 217 and the player 218 are electrically connected to the output terminal of the controller 219, and the input terminal of the controller 219 is electrically connected to the output terminal of the battery box 220, ensuring that the camera 217, the player 218 and the controller 219 work normally.
[0023] The teaching aid box 1 is equipped with a switching support assembly 3 on its outside. The switching support assembly 3 includes an internally threaded shaft tube 301, a turntable box 302, a fixing screw 303, a pressing plate 304, a support tube 305, a support plate 306, a counterweight box 307, a rotating rod 308, a magnetic slider 309, a magnetic rail 310, a movable support bar 311, a height-fixing opening 312, an arc-shaped spring clip 313, an adsorption groove 314, a suction cup 315, an anti-slip pad 316, a protective support box 317, and a magnetic piece 318. A threaded shaft tube 301 is welded to the middle of the side of the teaching aid box 1. A turntable box 302 is rotatably sleeved on the outside of the threaded shaft tube 301. A fixing screw 303 is threadedly connected inside the threaded shaft tube 301. An extrusion plate 304 is welded to one end of the fixing screw 303. A support tube 305 is welded through the turntable box 302. A support plate 306 is slidably installed inside the support tube 305. A counterweight box 307 is welded to the bottom of the support plate 306. The counterweight box 307 contains... One end is hinged to a rotating rod 308, and the other end of the rotating rod 308 is rotatably connected to a magnetic slider 309. The magnetic slider 309 is slidably installed inside a magnetic rail 310. A movable support strip 311 is glued to one side of the magnetic rail 310. A fixed height opening 312 is evenly opened on one side of the turntable box 302 and the support tube 305. An arc-shaped spring clip 313 is installed on the support plate 306 corresponding to the fixed height opening 312 so that the arc-shaped spring clip 313 can be movably engaged in the fixed height opening 312.
[0024] The bottom surface of the counterweight box 307 is provided with an adsorption groove 314, and a suction cup 315 is installed inside the adsorption groove 314. An anti-slip pad 316 is attached to the bottom surface of the counterweight box 307 to ensure that the counterweight box 307 is placed stably. A protective support box 317 is snapped onto one side of the teaching aid box 1, and a magnetic piece 318 is embedded in the middle of the other side of the teaching aid box 1. The magnetic pieces 318 of adjacent teaching aid boxes 1 have opposite polarities on their opposite sides. The protective support box 317 protects the switching support component 3 and facilitates stacking.
[0025] The working principle and usage process of this invention: When the teaching aid is needed, the instructor rotates the teaching aid box 1 around the connection point as the axis, so that the adjacent teaching aid boxes 1 are perpendicular to each other. The positioning rod 211 is pulled along the shaft 209. After the positioning rod 211 is disengaged from the original positioning rod 211, the positioning rod 211 is rotated to engage the positioning hole 212 with the positioning rod 211 of the adjacent disassembly end plate 201. While the adjacent teaching aid boxes 1 are perpendicular to each other, the angle between the adjacent teaching aid boxes 1 and the positioning rod 211 forms a right-angled isosceles triangle for support. The four teaching aid boxes 1 are combined into a tube with open ends, and the stability of the tube structure is ensured. Next, the pressing plates 304 on the left and right sides are loosened. Under the action of gravity, the turntable box 302 rotates around the internal threaded shaft tube 301. The counterweight box 307 faces the ground. The pressing plates 304 are rotated and press the turntable box 302 to fix it. The movable support bar 311 is pulled and the rotating rod 308 rotates. The movable support bar 311 and the counterweight box 307 serve as a support structure. The pulling of the movable support bar 311 expands the support area. In conjunction with the suction cup 315 on the bottom of the counterweight box 307, it adheres to the placement surface, making the support more stable. When placing, the magnetic slider 309 can be pulled along the magnetic rail 310 to change the position of the movable support bar 311 to prevent the problem of difficulty in placement due to space size. This makes it more adaptable to the placement space and improves the stability of placement. The support plate 306 is pulled along the support tube 305 so that the arc spring clip 313 is engaged in the corresponding fixed height opening 312 to adjust the height of the teaching aid, thereby facilitating the use of children. The teaching aid frame 206 is pulled out from the upper teaching aid box 1. The folding rod 202 in the control box 203 changes from a folded state to an unfolded state. At this time, the movable sealing plate 204 is at the end of the teaching aid box 1 away from the disassembly end plate 201. The teaching aid frame 206 is rotated, and the teaching aid frame 206 remains vertical under the influence of gravity. The adapter arm 213 in the information collection box 208 is rotated, and then the rotating head 215 is rotated in the rotating slot 214 to adjust the position of the functional arm 216 and the camera 217 so that the camera 217 is aligned with the double-sided magnetic plate 207. When the child is operating, it can be connected to an external control console through the controller 219 and through a network platform. The system monitors the children's operation and guides them through the operation via voice prompts from the player 218. The double-sided magnetic board 207 can be used to teach children magnetic puzzles, cultivating their logical thinking while also teaching basic magnetism. After the double-sided magnetic board 207 on the front is assembled, the teaching aid frame 206 is rotated around the pivot 205 to assemble the back side. Similarly, the four teaching aid boxes 1 can be rotated to extract the teaching aid frames 206 from the remaining boxes. Multiple teaching aids are integrated into one teaching aid, and the teaching aid box 1 also has a storage function, making it easy to access, less likely to be lost, and more convenient to operate. The end plate 201 can be removed and replaced with the battery box 220 inside the control box 203. It can also be replaced with other types of teaching aids frame 206, such as drawing board or building blocks, which makes the teaching aids more widely used. After use, rotate the positioning rod 211, the positioning hole 212 disengages from the clamping rod 210, rotate the positioning rod 211 to be parallel to the long side of the disassembly end plate 201, fold the tube body composed of the four teaching aid boxes 1, the magnetic pieces 318 attract each other, and then attach the protective support box 317 to the outside of the teaching aid box 1 to protect the switching support component 3, so that the hollow tube body in the middle becomes a flat structure, and the structure can be stacked to reduce the space occupied, further facilitating storage and retrieval.
[0026] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A teaching aid combination structure for cultivating logical thinking in young children, comprising a teaching aid box (1), characterized in that: The teaching aid box (1) is equipped with a switching assembly (2), which includes a detachable end plate (201). The edges of the four teaching aid boxes (1) are hinged together. A disassembly end plate (201) is installed at one end of the teaching aid box (1) by screws. The disassembly end plate (201) is located inside the teaching aid box (1) and is connected to one end of a folding rod (202). The other end of the folding rod (202) is hinged to the inside of the control box (203). A movable sealing plate (204) is hinged to the bottom of one end of the control box (203). A rotating shaft (205) is installed in the middle of the side of the movable sealing plate (204). A teaching aid frame (206) is rotatably connected to one end of the rotating shaft (205). A double-sided magnetic suction plate (207) is embedded inside the teaching aid frame (206). An information collection frame (208) is embedded on one side inside the teaching aid frame (206). A shaft (209) is installed on one side of the disassembly end plate (201), and a locking rod (210) is installed on the other side of the disassembly end plate (201). A positioning rod (211) is rotatably connected to the outside of the shaft (209). A positioning hole (212) is provided on the positioning rod (211) near the locking rod (210). The length of the shaft (209) is twice the length of the locking rod (210).
2. The teaching aid combination structure for cultivating logical thinking in young children according to claim 1, characterized in that, The information collection frame (208) has an adapter arm (213) rotatably mounted on one end. The adapter arm (213) has a rotating groove (214) at one end. A rotating head (215) is rotatably mounted inside the rotating groove (214). A functional arm (216) is connected to one end of the rotating head (215). A camera (217) is rotatably mounted on one end of the functional arm (216). A player (218) is embedded in the middle of the functional arm (216).
3. The teaching aid combination structure for cultivating logical thinking in young children according to claim 2, characterized in that, A controller (219) is installed on one side inside the control box (203), and a battery box (220) is installed inside the control box (203) near the controller (219). The input terminals of the camera (217) and the player (218) are electrically connected to the output terminal of the controller (219), and the input terminal of the controller (219) is electrically connected to the output terminal of the battery box (220).
4. The teaching aid combination structure for cultivating logical thinking in young children according to claim 1, characterized in that, The teaching aid box (1) has symmetrically welded slide rails (221) inside, and the control box (203), movable sealing plate (204) and teaching aid frame (206) have support grooves (222) at the corresponding slide rails (221).
5. The teaching aid combination structure for cultivating logical thinking in young children according to claim 1, characterized in that, When adjacent teaching aid boxes (1) are perpendicular to each other, the distance between the shaft (209) and the positioning rod (211) of the same disassembly end plate (201) is equal to the distance between the shaft (209) and the positioning rod (211) of the adjacent disassembly end plate (201).
6. The teaching aid combination structure for cultivating logical thinking in young children according to claim 1, characterized in that, The folding rod (202) is composed of two straight rods connected by rotation, and the maximum length of the folding rod (202) is equal to the length of the teaching aid frame (206).
7. The teaching aid combination structure for cultivating logical thinking in young children according to claim 1, characterized in that, The teaching aid box (1) is equipped with a switching support assembly (3) on the outside, and the switching support assembly (3) includes an internally threaded shaft tube (301). The teaching aid box (1) has an internally threaded shaft tube (301) welded to the middle of its side. A turntable box (302) is rotatably sleeved on the outside of the internally threaded shaft tube (301). A fixing screw (303) is threadedly connected inside the internally threaded shaft tube (301). An extrusion plate (304) is welded to one end of the fixing screw (303). A support tube (305) is welded through the outside of the turntable box (302). A support plate (306) is slidably installed inside the support tube (305). A counterweight box (307) is welded to the bottom of the support plate (306). A rotating rod (308) is hinged to one end of the counterweight box (307). A magnetic slider (309) is rotatably connected to one end of the rotating rod (308). A magnetic slider (309) is slidably installed inside a magnetic rail (310). A movable support strip (311) is glued to one side of the magnetic rail (310).
8. The teaching aid combination structure for cultivating logical thinking in young children according to claim 7, characterized in that, The turntable box (302) and the support tube (305) are evenly provided with height-fixed openings (312) on one side, and the support plate (306) is equipped with an arc-shaped spring clip (313) corresponding to the height-fixed opening (312).
9. The teaching aid combination structure for cultivating logical thinking in young children according to claim 7, characterized in that, The bottom surface of the counterweight box (307) is provided with an adsorption groove (314), and a suction cup (315) is installed inside the adsorption groove (314). An anti-slip pad (316) is adhered to the bottom surface of the counterweight box (307).
10. A teaching aid combination structure for cultivating logical thinking in young children according to claim 7, characterized in that, The teaching aid box (1) is attached to a protective support box (317) on one side, and a magnet (318) is embedded in the middle of the other side of the teaching aid box (1). The magnets (318) of adjacent teaching aid boxes (1) have opposite polarities on their opposite sides.
Citation Information
Patent Citations
Electronic building block module and electronic building block teaching aid
CN105513474A
