CN113689764B - University's mathematics probability distribution demonstrates teaching aid - Google Patents
University's mathematics probability distribution demonstrates teaching aid Download PDFInfo
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- CN113689764B CN113689764B CN202110982973.XA CN202110982973A CN113689764B CN 113689764 B CN113689764 B CN 113689764B CN 202110982973 A CN202110982973 A CN 202110982973A CN 113689764 B CN113689764 B CN 113689764B
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Abstract
The invention relates to the technical field of demonstration teaching aids, in particular to a demonstration teaching aid for probability distribution of mathematics in universities; comprises a demonstration bin and a demonstration board module; because the Golgin board is often used in the probabilistic discipline for demonstrating normal distribution, a large-scale teaching aid is required during teaching, is inconvenient to operate during use, can interfere with the space of a platform, shields the view of observing a blackboard in a classroom and influences normal teaching; therefore, the demonstration cabin with the cone-shaped structure is arranged, the wireless spotlight on the cone angle of the demonstration cabin irradiates the demonstration board module made of the transparent acrylic material on the bottom surface, the accumulation process of demonstration balls in the Golgin board is displayed on the projection surface, repeated demonstration is carried out by utilizing the overturning demonstration cabin, the demonstration effect of a large-scale teaching aid is achieved by using the miniaturized demonstration cabin, the occupation of the space of the talkback platform and the shielding of the blackboard are avoided, and the application effect of the demonstration teaching aid for the probability distribution of mathematics in university is improved.
Description
Technical Field
The invention relates to the technical field of demonstration teaching aids, in particular to a demonstration teaching aid for probability distribution of mathematics in universities.
Background
In the teaching of university subjects, most of the subjects teach on the basis of slide courseware, and the subjects including actual operation contents perform actual operation to improve the knowledge content mastery of students; in the teaching of university's mathematics probability branch of academic or vocational study, adopt the teaching aid to carry out the demonstration of probability incident, can strengthen understanding and the knowledge to the probability to the vividness of classroom teaching has been increased simultaneously.
Wherein probability subject often uses the Golgin board to carry out the demonstration of normal distribution, need adopt large-scale teaching aid when teaching to ensure that the demonstration content of observing the teaching aid can both be clear to the position everywhere in classroom, and large-scale teaching aid is inconvenient to be operated in the use, still can cause the interference to the space of podium, shelters from the sight of observing the classroom blackboard, influences normal teaching effect.
The teaching aid comprises a probability demonstration screen, a slide rail is fixedly connected to the upper end of the probability demonstration screen, a slide block is slidably connected to the front end of the slide rail, a demonstration board is fixedly connected to the front end of the slide block, locking blocks are fixedly connected to the left end and the right end of the slide block, locking boxes are fixedly connected to the left end and the right end of the slide rail, outer pipes are fixedly connected to the lower inner walls of the two locking boxes, springs are fixedly connected to the lower inner walls of the two outer pipes, inner pipes are slidably connected to the two outer pipes, the two inner pipes are located on the upper sides of the two springs respectively, clamping grooves are formed in the lower ends of the two locking blocks, clamping blocks are fixedly connected to the upper ends of the two inner pipes, and the clamping block located on the left side is clamped to the clamping groove, and the technical scheme aims to solve the problem that key points and processes in the prior art are inconvenient to record; but the demonstration teaching aid that uses among this technical scheme still need carry out gliding operation with the demonstration board in the use, has increased the space that occupies, and the demonstration screen of taking compares with the slide courseware that shows in the university teaching, is difficult to embody the problem of teaching aid probability distribution demonstration actual process.
In view of the above, the invention provides a university mathematics probability distribution demonstration teaching aid, which solves the technical problems.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a university mathematics probability distribution demonstration teaching aid, which is characterized in that a demonstration cabin with a cone-shaped structure is arranged, a wireless spotlight on a cone angle of the demonstration cabin irradiates a demonstration board module made of a transparent acrylic material on a bottom surface, the accumulation process of demonstration balls in a Golgin board is displayed on a projection surface, repeated demonstration is carried out by turning the demonstration cabin, the demonstration effect of a large-scale teaching aid is achieved by using a miniaturized demonstration cabin, the occupation of an intercom platform space and the shielding of a blackboard are avoided, and the application effect of the university mathematics probability distribution demonstration teaching aid is improved.
The invention relates to a university mathematics probability distribution demonstration teaching aid, which comprises a demonstration bin and a demonstration board module; the demonstration bin is a conical shell, the demonstration board module is mounted on the bottom surface of the demonstration bin, the inner wall of the conical surface of the demonstration bin is a reflecting mirror surface, the wireless spotlight is mounted on the conical angle of the demonstration bin, and the wireless spotlight faces the demonstration board module on the bottom surface of the demonstration bin;
the demonstration board module is made of transparent acrylic materials and comprises a Golgin board, a flow guide hopper and a ball bin; the Gordon board covers the bottom surface of the demonstration bin, a ball bin is arranged above the Gordon board, and the ball bin is communicated with the top end of the Gordon board; the top of the ball bin is also provided with a convex cylinder, and the diameter of the convex cylinder is greater than the width of the ball bin; a rotary barrel box is also arranged in the convex barrel, and the opening of the barrel box is matched with the port of the ball bin; the end part of the barrel box is also provided with a rotating handle which penetrates through the outer side of the convex barrel; the opening of the cylinder box faces the inner wall of the convex cylinder under the driving of the rotating handle, and a black demonstration ball of a Golgin plate is filled in the cylinder box; the ball bin is also provided with a flow guide hopper which enables the convex cylinder and the Golgin plates to be communicated; the caliber of the flow guide hopper is gradually reduced from the direction of the convex cylinder to the direction of the Golgin plate, and the bottom end of the flow guide hopper is positioned at the center of the top end of the Golgin plate; the length of the flow guide hopper is smaller than that of the ball bin, membrane cloth is further arranged between the two ends of the Golton board and the end of the ball bin, a deflector rod is arranged on the membrane cloth in the direction towards the end of the ball bin, the deflector rod is installed on the side wall of the ball bin in a sliding mode and protrudes outwards, and the membrane cloth is controlled by the sliding deflector rod to separate the ball bin;
in the prior art, a Goldon board is often used in the probabilistic discipline for normal distribution demonstration, a large-scale teaching aid is required during teaching to ensure that the demonstration content of the teaching aid can be clearly observed at each position of a classroom, and the large-scale teaching aid is inconvenient to operate during use, can also interfere with the space of a platform, shields the view of observing a blackboard in the classroom and influences the normal teaching effect;
therefore, the demonstration bin is set into a conical shell, the demonstration board module made of transparent acrylic materials is installed on the bottom surface of the conical demonstration bin, the wireless spotlight on the cone angle of the demonstration bin is started in a matching manner, the image in the demonstration board module is projected onto the wall surface of a classroom, when demonstration is performed, the opening of the barrel box is enabled to face the ball bin by rotating the barrel box, the demonstration balls in the barrel box fall to the middle of the top end of the Golgin board along the flow guide hopper, after all the demonstration balls roll and are accumulated at the bottom of the Golgin board, a normal distribution pattern with the position of the bottom end of the flow guide hopper as the center is formed, namely, the demonstration process of probability distribution is completed once, then the demonstration bin is reversed, so that the demonstration balls at the bottom of the Golgin board roll back to the ball bin, sliding deflector rods at two ends of the ball bin to open the membrane cloth, so that the spaces at the end parts of the ball bin are communicated, part of the demonstration balls rolling down from the bottom of the Golton plate fall back from a bottom port of the flow guide hopper, part of the demonstration balls move to two ends of the flow guide hopper along a convergent inclined plane of the flow guide hopper, the demonstration balls enter the barrel box through the space communicated by the end parts of the ball bin, then rotating a rotating handle to turn the barrel box over, so that an opening of the barrel box faces the inner wall of the convex barrel, then turning the demonstration bin back to an initial state, sliding the deflector rods on the ball bin, so that the membrane cloth separates two ends of the ball bin, and rotating the barrel box to enable the demonstration balls to fall into the Golton plate along the flow guide hopper when the Golton plate is required to perform normal distribution demonstration in such a reciprocating manner; the demonstration cabin with the cone-shaped structure is utilized, the wireless spotlight on the cone angle of the demonstration cabin irradiates the demonstration board module made of transparent acrylic materials on the bottom surface, the accumulation process of demonstration balls in the Golgin board is displayed on the projection surface, repeated demonstration is carried out by turning the demonstration cabin, the demonstration effect of a large-scale teaching aid is achieved by using the miniaturized demonstration cabin, the occupation of the space of an intercom platform and the shielding of the blackboard are avoided, and therefore the application effect of the demonstration teaching aid for the probability distribution of mathematics in universities is improved.
Preferably, the diversion hopper further comprises a limiting frame, a diversion frame, a side plate and a rolling film; the outer side of the end part of the limiting frame is fixed with the membrane cloth, and a self-contraction scroll is arranged below the end part of the limiting frame; the flow guide frame is slidably mounted at the top end of the Golgin plate, and a traction rod is further arranged on the flow guide frame and penetrates through the surface of the outer wall of the ball bin; a side plate is fixed between the limiting frame and the flow guide frame in the length direction, a pair of rolled films is arranged between the limiting frame and the flow guide frame in the width direction, the top ends of the rolled films are installed on a self-contraction scroll, and the bottom ends of the rolled films 34 are fixedly connected to the flow guide frame; during operation, through setting up spacing frame and the water conservancy diversion frame in the water conservancy diversion fill, make water conservancy diversion frame slidable mounting on the top of Golgin board, the cooperation is installed at the book membrane on the self-contraction spool, after the position of water conservancy diversion frame at the Golgin board top is changed to the removal traction lever, pull the roll membrane through the water conservancy diversion frame, make it be adapted to the position relation between water conservancy diversion frame and spacing frame to roll up the membrane, install the curb plate between water conservancy diversion frame and spacing frame, ensure to change the roll membrane at inclination and can maintain the guide effect of water conservancy diversion fill to the whereabouts of demonstration ball, and then change the position that the demonstration ball falls into the top of Golgin board, utilize the distance that the water conservancy diversion frame is close to the end of Golgin board to be as the coefficient variable of deviation in the probability, make demonstration board module show the condition of skewed state distribution, the probability distribution kind that the demonstration storehouse can be shown has been increased, thereby university mathematics probability distribution demonstration teaching aid application effect has been promoted.
Preferably, the bottom surfaces of the two sides of the flow guide frame are also provided with arc blocks; a flange is arranged on the top end face of the Golgin plate, and an arc groove is formed in the surface of the flange; the guide frame is contacted with the arc groove on the top end surface of the Golgin plate through the arc block; during operation, through setting up arc piece and arc groove on water conservancy diversion frame and the Golgin board, make the water conservancy diversion frame move the position under the traction lever drives after, utilize the block between arc piece and the arc groove to keep fixed, when avoiding the demonstration ball in the barrel box to pound the roll membrane that falls the different tensile length in water conservancy diversion frame both sides, the gravity of demonstration ball on the longer roll membrane of accumulation overcomes the gravity of demonstration ball on the shorter roll membrane, cause the inclined to pull to the water conservancy diversion frame, the position of slidable mounting at the top water conservancy diversion frame of Golgin board has been changed, make the demonstration ball in the score class fill fall from the fixed position in top of the Golgin board, and the flange on the surface of Golgin board has increased the area of contact with the water conservancy diversion frame bottom, the stability of arc piece block in the arc groove has been promoted, ensure the process of demonstrating the skewed state distribution, thereby the demonstration teaching aid application effect of university mathematics probability distribution demonstration has been stabilized.
Preferably, the bottom surfaces of the two ends of the flow guide frame are fixedly connected with elastic steel sheets, the section of each steel sheet is in a shape like a Chinese character ji, the two ends of each steel sheet are respectively abutted against the flanges, and the flow guide frame is clamped on the flanges of the Golgin plates through the steel sheets; during operation, through the steel sheet of setting on the water conservancy diversion frame bottom surface, further stabilize the block relation between water conservancy diversion frame and the Golgin board, prevent to pound down to the vibration transmission of the demonstration ball of rolling up the membrane after the water conservancy diversion frame, make the contact surface production between arc piece and arc groove rock, and utilize and set to the steel sheet of "nearly" shape, make the clamping-force equilibrium of steel sheet act on the flange contact surface of water conservancy diversion frame and Golgin board, maintain the stability of water conservancy diversion frame gesture on the Golgin board, thereby university's mathematics probability distribution demonstration teaching aid application effect has been stabilized.
Preferably, the steel sheet is further provided with raised convex balls, and the convex balls are positioned at two ends of the steel sheet and are in contact with the flanges; when the guide frame works, the steel sheet slides along the surface of the flange under the movement of the guide frame; through carrying out the punching press processing to the both ends of steel sheet, form the protruding ball of uplift, make the sliding friction of steel sheet and the inter-flange contact surface turn into the point contact friction of protruding ball, the dynamics of traction lever when having reduced the removal of drive water conservancy diversion frame is convenient for operate in order to change the position of water conservancy diversion frame on the board of Golgin to university's mathematics probability distribution demonstration teaching aid result of use has been promoted.
Preferably, a locking ring and an upright post are further arranged on the cone angle of the demonstration bin, and the demonstration bin changes the placing posture of the demonstration bin by adjusting the height of the locking ring on the upright post; during operation, through setting up catch and the stand in demonstration storehouse taper angle department, make the posture adaptation after the demonstration storehouse changes in the classroom podium and the projection surface between the position difference, ensure to demonstrate the distribution state that the ball pile formed in the board of Golgin and show to maintain college mathematics probability distribution demonstration teaching aid result of use.
The invention has the following beneficial effects:
1. according to the demonstration device, the demonstration cabin with the cone-shaped structure is arranged, the wireless spotlight on the cone angle of the demonstration cabin irradiates the demonstration board module made of the transparent acrylic material on the bottom surface, the accumulation process of demonstration balls in the Golgin board is displayed on the projection surface, repeated demonstration is carried out by turning the demonstration cabin, the demonstration effect of a large-scale teaching aid is achieved by using the miniaturized demonstration cabin, and the occupation of the space of the intercom table and the shielding of the blackboard are avoided.
2. According to the demonstration device, the guide frame is arranged at the top end of the Golgin plate in a sliding mode through the limiting frame and the guide frame arranged in the guide hopper, the guide frame is matched with the coiled film arranged on the self-contraction reel, the position of the demonstration ball falling into the top end of the Golgin plate is further changed, the distance between the guide frame and the end of the Golgin plate is used as a deviation coefficient variable in probability, the demonstration board module shows the condition of deviation distribution, and the probability distribution types which can be shown by the demonstration bin are increased.
3. According to the demonstration device, the arc blocks and the arc grooves are arranged on the flow guide frame and the Golgin plate, so that the flow guide frame is kept fixed by clamping between the arc blocks and the arc grooves after being driven by the traction rod to move to a position, the phenomenon that the flow guide frame is dragged by a rolling film when a demonstration ball in a barrel box falls on the rolling film with different inclined postures on two sides of the flow guide frame is avoided, the position of the flow guide frame which is slidably arranged at the top end of the Golgin plate is changed, the demonstration ball in the flow scoring hopper can fall from the position fixed at the top end of the Golgin plate, and the process of demonstrating the skewed distribution is ensured.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a perspective view of a university mathematics probability distribution demonstration teaching aid in the invention;
FIG. 2 is an exploded view of the funnel assembly of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is an enlarged view of a portion of FIG. 2 at C;
in the figure: 1. a demonstration bin; 11. a wireless spot light; 12. a locking ring; 13. a column; 2. a Golgin plate; 21. a flange; 211. an arc groove; 3. a flow guide hopper; 31. a limiting frame; 311. a self-retracting reel; 32. a flow guide frame; 321. a draw bar; 322. an arc block; 323. a steel sheet; 324. a convex ball; 33. a side plate; 34. rolling the film; 4. a ball bin; 41. a convex cylinder; 42. a cartridge; 421. a handle is rotated; 43. film cloth; 431. a deflector rod.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the university mathematics probability distribution demonstration teaching aid comprises a demonstration bin 1 and a demonstration board module; the demonstration cabin 1 is a conical shell, a demonstration board module is installed on the bottom surface of the demonstration cabin 1, the inner wall of the conical surface of the demonstration cabin 1 is a reflecting mirror surface, a wireless spotlight 11 is installed on the conical angle of the demonstration cabin 1, and the wireless spotlight 11 faces the demonstration board module on the bottom surface of the demonstration cabin 1;
the demonstration board module is made of transparent acrylic materials and comprises a Golgin board 2, a flow guide hopper 3 and a ball bin 4; the Gordon board 2 covers the bottom surface of the demonstration bin 1, a ball bin 4 is arranged above the Gordon board 2, and the ball bin 4 is communicated with the top end of the Gordon board 2; the top of the ball bin 4 is also provided with a convex cylinder 41, and the diameter of the convex cylinder 41 is greater than the width of the ball bin 4; a rotary barrel box 42 is also arranged in the convex barrel 41, and the opening of the barrel box 42 is matched with the port of the ball bin 4; the end part of the barrel box 42 is also provided with a rotating handle 421, and the rotating handle 421 penetrates to the outer side of the convex barrel 41; the cylinder box 42 is driven by the rotating handle 421 to enable the opening to face the inner wall of the convex cylinder 41, and the black demonstration ball of the Golgin plate 2 is filled in the cylinder box 42; the ball bin 4 is also provided with a flow guide hopper 3, and the convex cylinder 41 is communicated with the Golgin plate 2 through the flow guide hopper 3; the aperture of the flow guide hopper 3 is gradually reduced from the direction of the convex cylinder 41 to the direction of the Golgin plate 2, and the bottom end of the flow guide hopper 3 is positioned at the center of the top end of the Golgin plate 2; the length of the flow guide hopper 3 is smaller than that of the ball bin 4, a film cloth 43 is arranged between the two ends of the Golgin plate 2 and the end part of the ball bin 4, a deflector rod 431 is arranged in the direction of the end part of the ball bin 4 towards the film cloth 43, the deflector rod 431 is slidably arranged on the side wall of the ball bin 4 and protrudes outwards, and the film cloth 43 is controlled by the sliding deflector rod 431 to separate the ball bin 4;
in the prior art, a Goldon board 2 is often used in the probability discipline for normal distribution demonstration, a large-scale teaching aid is required during teaching to ensure that the demonstration content of the teaching aid can be clearly observed at each position of a classroom, and the large-scale teaching aid is inconvenient to operate during use, can interfere with the space of a platform, shields the view of observing a blackboard of the classroom and influences the normal teaching effect;
therefore, the demonstration bin 1 is set to be a conical shell, the demonstration board module made of transparent acrylic materials is installed on the bottom surface of the conical demonstration bin 1, the wireless spotlight 11 on the cone angle of the demonstration bin 1 is started in a matching mode, the image in the demonstration board module is projected onto the wall surface of a classroom, when demonstration is performed, the opening of the cylinder box 42 faces the ball bin 4 by rotating the cylinder box 42, the demonstration balls in the cylinder box 42 fall to the middle of the top end of the Golgi plate 2 along the flow guide hopper 3, after all the demonstration balls roll and are accumulated at the bottom of the Golgi plate 2, a normal distribution pattern with the bottom end position of the flow guide hopper 3 as the center is formed, namely, the demonstration process of probability distribution is completed once, then the demonstration bin 1 is reversed, the demonstration balls at the bottom of the Golgi plate 2 roll back to the ball bin 4, at the moment, the deflector rods 431 at the two ends of the sliding ball bin 4 open the membrane cloth 43, so that the spaces at the end parts of the ball bin 4 are communicated, part of the demonstration balls rolled from the bottom of the Golgin plate 2 fall back from the bottom port of the flow guide hopper 3, and part of the demonstration balls move to the two ends of the flow guide hopper 3 along the convergent inclined plane of the flow guide hopper 3, enter the barrel box 42 through the space communicated with the end parts of the ball bin 4, then the rotating handle 421 is rotated to turn the barrel box 42 over, so that the opening of the barrel box 42 faces the inner wall of the convex barrel 41, then the demonstration bin 1 is turned back to the initial state, and the deflector rods 431 on the ball bin 4 are slid, so that the membrane cloth 43 separates the two ends of the ball bin 4, when the Golgin plate 2 is required to be normally distributed, the barrel box 42 is rotated to make the demonstration balls fall into the Golgi plate 2 along the flow guide hopper 3, and the probability of normally distributed is demonstrated in a reciprocating manner; the demonstration device utilizes the demonstration cabin 1 with a cone-shaped structure, the wireless spotlight 11 on the cone angle of the demonstration cabin 1 irradiates a demonstration board module made of transparent acrylic materials on the bottom surface, the accumulation process of demonstration balls in the Goldon board 2 is displayed on the projection surface, repeated demonstration is carried out by turning the demonstration cabin 1, the small demonstration cabin 1 is used for achieving the demonstration effect of a large-scale teaching aid, the occupation of a talkback platform space and the shielding of a blackboard are avoided, and therefore the application effect of the demonstration teaching aid for the probability distribution of college mathematics is improved.
As an embodiment of the present invention, the diversion hopper 3 further includes a limiting frame 31, a diversion frame 32, a side plate 33, and a rolling film 34; the outer side of the end part of the limiting frame 31 is fixed with the membrane cloth 43, and a self-contraction scroll 311 is arranged below the end part of the limiting frame 31; the flow guide frame 32 is slidably mounted at the top end of the Golgin plate 2, a traction rod 321 is further arranged on the flow guide frame 32, and the traction rod 321 penetrates through the outer wall surface of the ball bin 4; a side plate 33 is fixed between the limiting frame 31 and the flow guide frame 32 in the length direction, a pair of rolling films 34 is arranged between the limiting frame 31 and the flow guide frame 32 in the width direction, the top ends of the rolling films 34 are installed on a self-contraction winding shaft 311, and the bottom ends of the rolling films 34 are fixedly connected to the flow guide frame 32; during operation, the guide frame 32 is slidably mounted at the top end of the Golgin plate 2 through the limiting frame 31 and the guide frame 32 arranged in the guide hopper 3, the coiled film 34 is mounted on the self-contraction scroll 311 in a matching manner, when the position of the guide frame 32 at the top end of the Golgin plate 2 is changed by moving the draw bar 321, the coiled film 34 is pulled through the guide frame 32, the coiled film 34 is adapted to the position relation between the guide frame 32 and the limiting frame 31, and the side plate 33 mounted between the guide frame 32 and the limiting frame 31 ensures that the coiled film 34 with the changed inclination angle can maintain the guiding effect of the guide hopper 3 on the falling of the demonstration ball, so that the position of the demonstration ball falling into the top end of the Golgin plate 2 is changed, the distance of the guide frame 32 close to the end part of the Golgin plate 2 is used as a deviation coefficient variable in probability, so that the demonstration plate module shows the state distribution condition, the probability distribution type of the demonstration chamber 1 is increased, and the demonstration application effect of the probability distribution teaching aid of university teaching aid is improved.
As an embodiment of the present invention, arc blocks 322 are further disposed on the bottom surfaces of the two sides of the flow guiding frame 32; a flange 21 is arranged on the top end face of the Golgin plate 2, and an arc groove 211 is arranged on the surface of the flange 21; the guide frame 32 is contacted with the arc groove 211 on the top end surface of the Golgin plate 2 through an arc block 322; when the demonstration device works, after the flow guide frame 32 is driven by the traction rod 321 to move to a position through the arc block 322 and the arc groove 211 which are arranged on the flow guide frame 32 and the Golgin plate 2, the arc block 322 and the arc groove 211 are clamped and fixed, so that the situation that when a demonstration ball in the barrel box 42 falls on the rolling films 34 with different stretching lengths on two sides of the flow guide frame 32, the gravity of the demonstration ball accumulated on the long rolling film 34 overcomes the gravity of the demonstration ball on the short rolling film 34 to cause deviation pulling on the flow guide frame 32, the position of the flow guide frame 32 which is arranged at the top end of the Golgin plate 2 in a sliding mode is changed, the demonstration ball in the flow scoring hopper can fall from the fixed position at the top end of the Golgin plate 2, the contact area between the flange 21 on the surface of the Golgin plate 2 and the bottom of the flow guide frame 32 is increased, the stability of clamping of the arc block 322 in the arc groove 211 is improved, the process of demonstrating the deviation distribution of mathematics teaching aids is ensured, and the application effect of demonstrating the probability distribution of university mathematics teaching aids is stabilized.
As an embodiment of the invention, the bottom surfaces of the two ends of the flow guiding frame 32 are further fixedly connected with an elastic steel sheet 323, the section of the steel sheet 323 is in a shape of a Chinese character 'ji', the two ends of the steel sheet 323 respectively abut against the flanges 21, and the flow guiding frame 32 is clamped on the flanges 21 of the golton plates 2 through the steel sheet 323; during operation, through steel sheet 323 that sets up on the bottom surface of guide frame 32, further stabilize the block relation between guide frame 32 and the Golgin board 2, prevent to pound down to the demonstration ball of rolling up membrane 34 after the vibration transmits guide frame 32, make the contact surface between arc piece 322 and arc groove 211 rock to utilize the steel sheet 323 that sets up to "nearly" shape, make the clamping-force equilibrium of steel sheet 323 act on guide frame 32 and the flange 21 contact surface of Golgin board 2, maintain the stability of guide frame 32 on Golgin board 2 attitude, thereby stabilized university's mathematics probability distribution demonstration teaching aid application effect.
As an embodiment of the present invention, the steel sheet 323 is further provided with raised convex balls 324, and the convex balls 324 are located at both ends of the steel sheet 323 and contact with the flange 21; in operation, the steel sheet 323 slides along the surface of the flange 21 under the movement of the guide frame 32; through carrying out stamping treatment to the both ends of steel sheet 323, form the protruding pompon 324 of uplift, make the sliding friction of steel sheet 323 and the contact surface between flange 21, turn into pompon 324's point contact friction, reduced the dynamics power of traction lever 321 when driving water conservancy diversion frame 32 and remove, be convenient for operate in order to change the position of water conservancy diversion frame 32 on the board 2 of Golgin to the mathematics university probability distribution demonstration teaching aid result of use has been promoted.
As an embodiment of the invention, a locking ring 12 and a vertical column 13 are further arranged on the cone angle of the demonstration bin 1, and the demonstration bin 1 changes the placing posture thereof by adjusting the height of the locking ring 12 on the vertical column 13; the during operation, through setting up catch 12 and stand 13 in 1 cone angle department in demonstration storehouse, make the posture adaptation after 1 changes in demonstration storehouse podium and the projection surface in the classroom between the position difference, ensure to demonstrate the distribution state that the ball pile formed in the board 2 of Golgin and show to maintain college mathematics probability distribution demonstration teaching aid result of use.
The specific working process is as follows:
the demonstration bin 1 is set to be a conical shell, the demonstration board module made of transparent acrylic materials is installed on the bottom surface of the conical demonstration bin 1, the wireless spotlight 11 on the cone angle of the demonstration bin 1 is started in a matching mode, images in the demonstration board module are projected onto the wall surface of a classroom, when demonstration is carried out, the opening of the demonstration board module faces the ball bin 4 by rotating the barrel box 42, demonstration balls in the barrel box 42 fall to the middle of the top end of the Golgin board 2 along the flow guide hopper 3, after the demonstration balls all fall and are accumulated at the bottom of the Golgin board 2, a normal distribution pattern taking the bottom end position of the flow guide hopper 3 as the center is formed, namely, the demonstration process of probability distribution is completed once, then the demonstration bin 1 is reversed, and the demonstration balls at the bottom of the Golgin board 2 roll back to the ball bin 4, at the moment, the deflector rods 431 at the two ends of the sliding ball bin 4 open the membrane cloth 43, so that the spaces at the end parts of the ball bin 4 are communicated, part of the demonstration balls rolled from the bottom of the Golgin plate 2 fall back from the bottom port of the flow guide hopper 3, and part of the demonstration balls move to the two ends of the flow guide hopper 3 along the convergent inclined plane of the flow guide hopper 3, enter the barrel box 42 through the space communicated with the end parts of the ball bin 4, then the rotating handle 421 is rotated to turn the barrel box 42 over, so that the opening of the barrel box 42 faces the inner wall of the convex barrel 41, then the demonstration bin 1 is turned back to the initial state, and the deflector rods 431 on the ball bin 4 are slid, so that the membrane cloth 43 separates the two ends of the ball bin 4, when the Golgin plate 2 is required to be normally distributed, the barrel box 42 is rotated to make the demonstration balls fall into the Golgi plate 2 along the flow guide hopper 3, and the probability of normally distributed is demonstrated in a reciprocating manner; the limiting frame 31 and the guide frame 32 are arranged in the guide hopper 3, the guide frame 32 is slidably arranged at the top end of the Golgin plate 2 and is matched with the coiled film 34 arranged on the self-contraction scroll 311, after the guide frame 32 is moved to change the position of the guide frame 32 at the top end of the Golgin plate 2, the coiled film 34 is pulled through the guide frame 32, the coiled film 34 is adapted to the position relation between the guide frame 32 and the limiting frame 31, the side plate 33 arranged between the guide frame 32 and the limiting frame 31 ensures that the coiled film 34 with the changed inclination angle can maintain the guiding effect of the guide hopper 3 on the falling of the demonstration ball, further the position of the demonstration ball falling into the top end of the Golgin plate 2 is changed, the distance of the guide frame 32 close to the end of the Golgin plate 2 is used as a deviation coefficient variable in probability, so that the demonstration board module shows the condition of deviation distribution, and the type of probability distribution which can be shown by the demonstration bin 1 is increased; the arc block 322 and the arc groove 211 which are arranged on the flow guide frame 32 and the Golton plate 2 ensure that the flow guide frame 32 moves down by the driving of the traction rod 321, the arc block 322 and the arc groove 211 are fixedly clamped, the situation that when a demonstration ball in the barrel box 42 falls on the rolling films 34 with different inclined postures on two sides of the flow guide frame 32, the flow guide frame 32 is pulled through the rolling films 34 is avoided, the position of the flow guide frame 32 which is slidably arranged on the top end of the Golton plate 2 is changed, the demonstration ball in the flow scoring bucket can fall down from the fixed position on the top end of the Golton plate 2, the contact area between the flange 21 on the surface of the Golton plate 2 and the bottom of the flow guide frame 32 is increased, the clamping stability of the arc block 322 in the arc groove 211 is improved, and the process of demonstrating skewed distribution is ensured; the lock ring 12 and the upright post 13 which are arranged at the cone angle of the demonstration bin 1 enable the posture of the demonstration bin 1 after being changed to be adapted to the position difference between the podium and the projection surface in the classroom, and ensure that the distribution state formed by the accumulation of the demonstration balls in the Golgin plate 2 is displayed.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A university mathematics probability distribution demonstration teaching aid comprises a demonstration bin (1) and a demonstration board module; it is characterized in that; the demonstration cabin (1) is a conical shell, the demonstration board module is installed on the bottom surface of the demonstration cabin (1), the inner wall of the conical surface of the demonstration cabin (1) is a reflecting mirror surface, the wireless spotlight (11) is installed on the conical angle of the demonstration cabin (1), and the wireless spotlight (11) faces the demonstration board module on the bottom surface of the demonstration cabin (1);
the demonstration board module is made of transparent acrylic materials and comprises a Golgin board (2), a flow guide hopper (3) and a ball bin (4); the Gordon board (2) covers the bottom surface of the demonstration bin (1), a ball bin (4) is arranged above the Gordon board (2), and the ball bin (4) is communicated with the top end of the Gordon board (2); the top of the ball bin (4) is also provided with a convex cylinder (41), and the diameter of the convex cylinder (41) is larger than the width of the ball bin (4); a rotary barrel box (42) is also arranged in the convex barrel (41), and an opening of the barrel box (42) is matched with a port of the ball bin (4); the end part of the barrel box (42) is also provided with a rotating handle (421), and the rotating handle (421) penetrates through the outer side of the convex barrel (41); the opening of the cylinder box (42) faces the inner wall of the convex cylinder (41) under the driving of the rotating handle (421), and a black demonstration ball filled with a Golgin plate (2) is arranged in the cylinder box (42); the ball bin (4) is also internally provided with a flow guide hopper (3), and the convex cylinder (41) is communicated with the Golgin plate (2) through the flow guide hopper (3); the caliber of the flow guide hopper (3) is gradually reduced from the direction of the convex cylinder (41) to the direction of the Goldon board (2), and the bottom end of the flow guide hopper (3) is positioned at the center of the top end of the Goldon board (2); the length of the flow guide hopper (3) is smaller than that of the ball bin (4), a film cloth (43) is further arranged between the two ends of the Goldon plate (2) and the end part of the ball bin (4), a deflector rod (431) is arranged on the film cloth (43) towards the end part of the ball bin (4), the deflector rod (431) is slidably mounted on the side wall of the ball bin (4) and protrudes outwards, and the film cloth (43) is controlled by the sliding deflector rod (431) to separate the ball bin (4);
the flow guide hopper (3) further comprises a limiting frame (31), a flow guide frame (32), a side plate (33) and a rolling film (34); the outer side of the end part of the limiting frame (31) is fixed with the membrane cloth (43), and a self-contraction scroll (311) is arranged below the end part of the limiting frame (31); the flow guide frame (32) is slidably mounted at the top end of the Golgin plate (2), a traction rod (321) is further arranged on the flow guide frame (32), and the traction rod (321) penetrates through the surface of the outer wall of the ball bin (4); a side plate (33) is fixed between the limiting frame (31) and the guide frame (32) in the length direction, a pair of rolling films (34) is arranged between the limiting frame (31) and the guide frame (32) in the width direction, the top ends of the rolling films (34) are arranged on a self-contraction reel (311), and the bottom ends of the rolling films (34) are fixedly connected to the guide frame (32); the position of the guide frame (32) at the top end of the Golgin plate (2) can be changed by moving the traction rod (321), so that the position of the demonstration ball falling into the top end of the Golgin plate (2) is changed.
2. A university mathematics probability distribution demonstration teaching aid according to claim 1, characterized in that: the bottom surfaces of the two sides of the flow guide frame (32) are also provided with arc blocks (322); a flange (21) is arranged on the top end face of the Golgin plate (2), and an arc groove (211) is formed in the surface of the flange (21); the guide frame (32) is contacted with the arc groove (211) on the top end surface of the Golgin plate (2) through the arc block (322).
3. A university mathematics probability distribution demonstration teaching aid according to claim 2, characterized in that: the bottom surfaces of the two ends of the flow guide frame (32) are fixedly connected with elastic steel sheets (323), the section of each steel sheet (323) is in a shape like a Chinese character 'ji', the two ends of each steel sheet (323) are respectively abutted against the flanges (21), and the flow guide frame (32) is clamped on the flanges (21) of the Golgin plates (2) through the steel sheets (323).
4. A university mathematics probability distribution demonstration teaching aid according to claim 3, characterized in that: the steel sheet (323) is also provided with raised convex balls (324), and the convex balls (324) are positioned at two ends of the steel sheet (323) and are in contact with the flange (21).
5. A university mathematics probability distribution demonstration teaching aid according to claim 1, characterized in that: the cone angle of the demonstration bin (1) is further provided with a lock ring (12) and an upright post (13), and the demonstration bin (1) changes the placing posture of the demonstration bin by adjusting the height of the lock ring (12) on the upright post (13).
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