Probability demonstration device

Abstract

The utility model provides a probability demonstration device which comprises a frame body, and the front end of the frame body is fixedly connected with an observation window. Compared with the prior art, the teaching aid has the advantages that the pull rope in the ball inlet assembly is pulled downwards to be matched with the ejection block, the ejection cylinder and the reset spring to open the ball inlet, the demonstration ball rolls to the top end of the ejection block at the moment, then the pull rope is loosened, and the demonstration ball enters the frame body along the ball inlet pipe, so that the demonstration process is simpler, and the demonstration effect is better. Foreign matters and the like can be prevented from entering the catapulting cylinder from the ball inlet pipe, normal operation of the device is guaranteed, a rotating rod in a plugging assembly is rotated after demonstration is completed, a second gear, a first gear, a threaded rod and a guide groove are matched to enable a moving block to move downwards, and a transmission rod and a sealing plate are matched to enable a demonstration ball to fall into the bottom of a frame body along the sealing plate; therefore, the demonstration balls in the space separated by the plurality of partition plates at the bottom of the frame body can be taken out without opening the cover plate, and the demonstration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a probability demonstration device, belonging to the field of mathematics teaching. Background Art

[0002] Probability is also called probability, chance, chance or possibility. It is a real number between 0 and 1. It is a measure of the probability of a random event. Therefore, the number that represents the probability of an event is called the probability of the event. In the teaching process of probability theory in higher mathematics, probability demonstration devices are usually used for demonstration to facilitate students' understanding.

[0003] In the prior art, some probability demonstration devices require the user to hold the pull rod by hand and pull it down until it can no longer be pulled, and then put the demonstration ball into the goal tube. The demonstration ball in the goal tube will roll onto the piston, and then the user releases the hand. The spring squeezed by the piston will reset and allow the demonstration ball on the piston to enter the rectangular frame along the ball outlet tube. Finally, the above operation can be repeated according to actual needs to complete the probability demonstration. However, since the goal tube opens upward and is located between the piston and the spring, foreign matter can easily enter the space between the piston and the spring, thereby hindering the movement of the piston and affecting the service life of the device. In addition, before each demonstration, the cover plate needs to be opened to take out the demonstration ball in the rectangular frame before another demonstration can be performed, which greatly reduces the teaching efficiency. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present utility model is to provide a probability demonstration device to solve the problem that some probability demonstration devices in the above-mentioned background technology have a ball tube opening upward and is located between the piston and the spring, which makes it easy for foreign matter to enter the space between the piston and the spring, thereby hindering the movement of the piston and affecting the service life of the device, and before each demonstration, it is necessary to open the cover and take out the demonstration ball in the rectangular frame before demonstrating again, which greatly reduces the teaching efficiency.

[0005] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a probability demonstration device, including a frame, an observation window is fixedly connected to the front end of the frame, a plurality of blocking columns are fixedly connected to the inner wall of the rear end of the frame, a plurality of partitions are fixedly connected to the inner wall of the bottom end of the frame, a blocking assembly is arranged in the frame below the blocking columns, a plurality of demonstration balls are movably connected in the frame below the blocking assembly, and a goal assembly is arranged on the side of the frame.

[0006] Furthermore, the blocking assembly includes a guide groove opened on the inner wall of the rear end of the frame, the inner wall of the guide groove is rotatably connected to a threaded rod, the bottom end of the threaded rod extends out of the guide groove and is fixedly connected to a first gear, a rotating rod is rotatably connected to the frame below the first gear, a second gear is fixedly connected to the surface of the rotating rod, the second gear is meshed with the first gear, a moving block is threadedly connected to the surface of the threaded rod, the front end of the moving block is rotatably connected to a transmission rod, the other end of the transmission rod is rotatably connected to a sealing plate, and the sealing plate and the frame are rotatably connected.

[0007] Furthermore, the goal-scoring assembly includes an ejection tube fixedly connected to the side of the frame, and the frame and the opposite sides of the ejection tube are provided with goal-scoring openings. A goal tube is fixedly connected to the top of the ejection tube, and an ejection block is slidably connected inside the ejection tube. A pull rope is fixedly connected to the bottom end of the ejection block, and a reset spring is fixedly connected to the inner wall of the bottom end of the ejection tube, and the reset spring and the ejection block are fixedly connected.

[0008] Furthermore, the top of the partition is arc-shaped, a first protection pad is fixedly connected to the top of the partition, and a protective cover is provided on the surface of the blocking column.

[0009] Furthermore, a second protection pad is fixedly connected to the top end of the sealing plate, and the inner wall of the bottom end of the frame is inclined.

[0010] Furthermore, the width of the ejection tube is equal to the width of the demonstration ball, the size of the ejection block is larger than the size of the ball entry hole, and a third protective pad is fixedly connected to the top of the ejection block.

[0011] The beneficial effects of the utility model are as follows: first, the device is placed in a suitable position, and then the pull rope in the goal assembly is pulled downward, and the goal opening can be opened in cooperation with the ejection block, the ejection tube and the return spring. The demonstration ball will roll to the top of the ejection block at this time, and then the pull rope is released, and the demonstration ball will enter the interior of the frame along the goal tube and move downward under the action of gravity. In this process, the demonstration ball will collide with several blocking columns, so that the sliding trajectory of the small ball can be more random to improve the accuracy of the demonstration result, and finally the demonstration ball will fall into one of the spaces separated by several partitions at the bottom of the frame. Compared with the original device, the present application does not need to hold the pull rod with one hand and put the small ball into the goal tube with the other hand. The demonstration ball can automatically roll to the top of the ejection block as the ejection block moves downward, which not only makes the demonstration process more streamlined, but also can prevent foreign matter from entering the interior of the ejection tube from the goal tube, thereby ensuring the normal operation of the device;

[0012] After the demonstration is completed, the rotating rod in the sealing assembly is rotated, and the second gear, the first gear, the threaded rod and the guide groove are cooperated to move the moving block downward. The transmission rod and the sealing plate are cooperated to make the demonstration ball fall into the bottom of the frame along the sealing plate, so that the demonstration ball located in the space separated by several partitions at the bottom of the frame can be taken out without opening the cover plate, thereby improving the efficiency of the demonstration. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0014] Figure 1 It is a schematic diagram of the overall structure of a probability demonstration device of the utility model;

[0015] Figure 2 It is a schematic diagram of the front view structure of a probability demonstration device of the utility model;

[0016] Figure 3 It is a schematic diagram of the side cross-sectional structure of a probability demonstration device of the utility model;

[0017] Figure 4 It is a schematic diagram of the enlarged structure at A of a probability demonstration device of the utility model.

[0018] In the figure: 1. frame; 2. observation window; 3. blocking column; 4. partition; 5. blocking assembly; 51. guide groove; 52. threaded rod; 53. first gear; 54. rotating rod; 55. second gear; 56. moving block; 57. transmission rod; 58. sealing plate; 6. demonstration ball; 7. goal assembly; 71. ejection tube; 72. goal port; 73. goal tube; 74. ejection block; 75. pull rope; 76. reset spring. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model provides a technical solution: a probability demonstration device, including a frame 1, an observation window 2 is fixedly connected to the front end of the frame 1, a plurality of blocking columns 3 are fixedly connected to the inner wall of the rear end of the frame 1, a plurality of partitions 4 are fixedly connected to the inner wall of the bottom end of the frame 1, a blocking component 5 is arranged below the blocking column 3 in the frame 1, a plurality of demonstration balls 6 are movably connected below the blocking component 5 in the frame 1, and a goal component 7 is arranged on the side of the frame 1.

[0021] First, put the device in a suitable position, then pull down the pull rope 75 in the goal assembly 7, cooperate with the ejection block 74, the ejection tube 71 and the return spring 76 to open the goal port 72, and the demonstration ball 6 will roll to the top of the ejection block 74 at this time, then release the pull rope 75, the demonstration ball 6 will enter the frame 1 along the goal tube 73 and move down under the action of gravity. In this process, the demonstration ball 6 will collide with several blocking columns 3, so that the sliding trajectory of the small ball can be more random to improve the accuracy of the demonstration result, and finally the demonstration ball 6 will fall into one of the spaces separated by several partitions 4 at the bottom of the frame 1. Compared with the original device, the present application does not need to hold the pull rod with one hand and put the small ball into the pipe with the other hand. The demonstration ball 6 can automatically roll to the top of the ejection block 74 as the ejection block 74 moves downward, which not only makes the demonstration process more streamlined, but also can prevent foreign matter from entering the ejection tube 71 from the pipe, thereby ensuring the normal operation of the device;

[0022] After the demonstration is completed, the rotating rod 54 in the blocking assembly 5 is rotated, and the moving block 56 can be moved downward in cooperation with the second gear 55, the first gear 53, the threaded rod 52 and the guide groove 51. The transmission rod 57 and the sealing plate 58 are combined to make the demonstration ball 6 fall into the bottom of the frame 1 along the sealing plate 58, so that the demonstration ball 6 located in the space separated by several partitions 4 at the bottom of the frame 1 can be taken out without opening the cover, thereby improving the efficiency of the demonstration.

[0023] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The blocking component 5 includes a guide groove 51 formed on the inner wall of the rear end of the frame 1, and a threaded rod 52 is rotatably connected to the inner wall of the guide groove 51. The bottom end of the threaded rod 52 extends out of the guide groove 51 and is fixedly connected to a first gear 53. A rotating rod 54 is rotatably connected below the first gear 53 in the frame 1, and a second gear 55 is fixedly connected to the surface of the rotating rod 54. The second gear 55 is meshed with the first gear 53. A moving block 56 is threadedly connected to the surface of the threaded rod 52, and a transmission rod 57 is rotatably connected to the front end of the moving block 56. The other end of the transmission rod 57 is rotatably connected to a sealing plate 58, and the sealing plate 58 is rotatably connected to the frame 1. After the demonstration is completed, the rotating rod 54 is rotated to drive the second gear 55 to rotate, and then the threaded rod 52 connected to the first gear 53 is driven to rotate. Due to the limitation of the guide groove 51, the moving block 56 moves downward along the surface of the threaded rod 52, and then the transmission rod 57 drives the sealing plate 58 to rotate downward around the inner wall of the frame 1, so that the demonstration ball 6 falls into the bottom of the frame 1 along the sealing plate 58, so that the demonstration ball 6 located in the space separated by several partitions 4 at the bottom of the frame 1 can be taken out without opening the cover plate, thereby improving the efficiency of the demonstration.

[0024] The goal assembly 7 includes an ejection tube 71 fixedly connected to the side of the frame 1, and a goal opening 72 is opened on the opposite sides of the frame 1 and the ejection tube 71. A goal tube 73 is fixedly connected to the top of the ejection tube 71, and an ejection block 74 is slidably connected inside the ejection tube 71. A pull rope 75 is fixedly connected to the bottom end of the ejection block 74, and a return spring 76 is fixedly connected to the inner wall of the bottom end of the ejection tube 71. The return spring 76 and the ejection block 74 are fixedly connected. The pull rope 75 is pulled downward so that it drives the ejection block 74 to slide downward along the inner wall of the ejection tube 71 and squeeze the return spring 76. When the pull rope 75 can no longer be pulled downward, the ejection block 74 will move away from the goal hole 72. The demonstration ball 6 can now roll along the inner wall of the bottom end of the frame 1 from the goal hole 72 to the top of the ejection block 74 in the ejection tube 71. Then the pull rope 75 is released, and the return spring 76 will reset and push the ejection block 74 back to its original position, thereby allowing the demonstration ball 6 to enter the interior of the frame 1 along the goal tube 73. Compared with the original device, the present application does not need to hold the pull rod with one hand and put the ball into the pipe with the other hand. The demonstration ball 6 can automatically roll to the top of the ejection block 74 as the ejection block 74 moves downward, which not only makes the demonstration process more streamlined, but also prevents foreign matter from entering the ejection tube 71 from the pipe, thereby ensuring the normal operation of the device.

[0025] The top of the partition 4 is arc-shaped, and a first protective pad is fixedly connected to the top of the partition 4, and a protective cover is provided on the surface of the blocking column 3. The top of the partition 4 is arc-shaped to ensure that the demonstration ball 6 can be guided to both sides of the partition 4 after falling to the top of the partition 4. The first protective pad and the protective cover can provide a buffer for the demonstration ball 6, thereby preventing the demonstration ball 6 from being damaged due to collision.

[0026] The top of the sealing plate 58 is fixedly connected with a second protective pad, and the inner wall at the bottom of the frame 1 is inclined. The second protective pad can provide a buffer for the demonstration ball 6, thereby preventing the demonstration ball 6 from being damaged due to collision. The inner wall at the bottom of the frame 1 is inclined to guide the demonstration ball 6 to the ball inlet 72, thereby facilitating the subsequent delivery of the demonstration ball 6 into the frame 1.

[0027] The width of the ejection barrel 71 is equal to the width of the demonstration ball 6, the size of the ejection block 74 is larger than the size of the goal hole 72, and a third protective pad is fixedly connected to the top of the ejection block 74. The width of the ejection barrel 71 is equal to the width of the demonstration ball 6 to ensure that only one demonstration ball 6 enters the ejection barrel 71 at a time when the ejection block 74 no longer blocks the goal hole 72. The size of the ejection block 74 is larger than the size of the goal hole 72 to ensure that the ejection block 74 can completely block the goal hole 72. The third protective pad can provide a buffer for the demonstration ball 6, thereby preventing the demonstration ball 6 from being damaged due to collision.

[0028] Specific implementation method: first put the device to a suitable position, then pull the pull rope 75 downward to drive the ejection block 74 to slide downward along the inner wall of the ejection tube 71 and squeeze the return spring 76. When the pull rope 75 can no longer be pulled down, the ejection block 74 will move away from the goal hole 72. The demonstration ball 6 can now roll from the goal hole 72 along the inner wall of the bottom end of the frame 1 to the top of the ejection block 74 in the ejection tube 71. Then release the pull rope 75, the return spring 76 will reset and push the ejection block 74 back to its original position, so that the demonstration ball 6 enters the interior of the frame 1 along the goal tube 73 and moves downward under the action of gravity. The demonstration ball 6 will collide with several blocking columns 3, so that the trajectory of the ball's sliding can be more random to achieve an uncontrollable landing point of the ball, which is conducive to improving the accuracy of the demonstration result. Finally, the demonstration ball 6 will fall into one of the spaces separated by several partitions 4 at the bottom of the frame 1. Compared with the original device, the present application does not need to hold the pull rod with one hand and put the ball into the pipe with the other hand. The demonstration ball 6 can automatically roll to the top of the ejection block 74 as the ejection block 74 moves downward, which not only makes the demonstration process more streamlined, but also prevents foreign matter from entering the ejection tube 71 from the pipe, ensuring the normal operation of the device;

[0029] After the demonstration is completed, the rotating rod 54 is rotated to drive the second gear 55 to rotate, and then the threaded rod 52 connected to the first gear 53 is driven to rotate. Due to the limitation of the guide groove 51, the moving block 56 moves downward along the surface of the threaded rod 52, and then the transmission rod 57 drives the sealing plate 58 to rotate downward around the inner wall of the frame 1, so that the demonstration ball 6 falls into the bottom of the frame 1 along the sealing plate 58, so that the demonstration ball 6 located in the space separated by several partitions 4 at the bottom of the frame 1 can be taken out without opening the cover plate, thereby improving the efficiency of the demonstration.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A probability demonstration device, comprising a frame (1), wherein the front end of the frame (1) is fixedly connected to an observation window (2), the inner wall of the rear end of the frame (1) is fixedly connected to a plurality of blocking columns (3), and the inner wall of the bottom end of the frame (1) is fixedly connected to a plurality of partitions (4), characterized in that: A blocking component (5) is arranged in the frame (1) below the blocking column (3), a plurality of demonstration balls (6) are movably connected in the frame (1) below the blocking component (5), and a ball-playing component (7) is arranged on the side of the frame (1).

2. A probability demonstration device according to claim 1, characterized in that: The blocking assembly (5) comprises a guide groove (51) formed on the inner wall of the rear end of the frame (1); a threaded rod (52) is rotatably connected to the inner wall of the guide groove (51); a bottom end of the threaded rod (52) extends out of the guide groove (51) and is fixedly connected to a first gear (53); a rotating rod (54) is rotatably connected to the frame (1) below the first gear (53); a second gear (55) is fixedly connected to the surface of the rotating rod (54); the second gear (55) is meshed with the first gear (53); a moving block (56) is threadedly connected to the surface of the threaded rod (52); a transmission rod (57) is rotatably connected to the front end of the moving block (56); a sealing plate (58) is rotatably connected to the other end of the transmission rod (57); and the sealing plate (58) is rotatably connected to the frame (1).

3. A probability demonstration device according to claim 1, characterized in that: The ball assembly (7) comprises a launching tube (71) fixedly connected to a side surface of the frame (1); opposite sides of the frame (1) and the launching tube (71) are each provided with a ball-entry opening (72); a ball tube (73) is fixedly connected to the top of the launching tube (71); an launching block (74) is slidably connected inside the launching tube (71); a pull rope (75) is fixedly connected to the bottom end of the launching block (74); a return spring (76) is fixedly connected to the inner wall of the bottom end of the launching tube (71); and the return spring (76) and the launching block (74) are fixedly connected.

4. A probability demonstration device according to claim 3, characterized in that: The top end of the partition (4) is arc-shaped, a first protective pad is fixedly connected to the top end of the partition (4), and a protective cover is provided on the surface of the blocking column (3).

5. A probability demonstration device according to claim 2, characterized in that: A second protective pad is fixedly connected to the top of the sealing plate (58), and the inner wall of the bottom end of the frame body (1) is inclined.

6. A probability demonstration device according to claim 3, characterized in that: The width of the ejection tube (71) is equal to the width of the demonstration ball (6), the size of the ejection block (74) is larger than the size of the ball entry hole (72), and a third protective pad is fixedly connected to the top of the ejection block (74).

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