CN111081122B - Physical teaching demonstration device for gravitational acceleration and use method thereof - Google Patents
Physical teaching demonstration device for gravitational acceleration and use method thereof Download PDFInfo
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- CN111081122B CN111081122B CN201911392321.XA CN201911392321A CN111081122B CN 111081122 B CN111081122 B CN 111081122B CN 201911392321 A CN201911392321 A CN 201911392321A CN 111081122 B CN111081122 B CN 111081122B
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Abstract
The invention discloses a physical teaching demonstration device for gravitational acceleration and a use method thereof, wherein the demonstration device comprises a box body, two fixed rods are fixedly connected to the inner top wall of the box body, the lower ends of the fixed rods are fixedly connected with limit sleeves, drive rods are commonly inserted into the two limit sleeves, a second belt pulley is fixedly sleeved on the outer side of the drive rod positioned between the two limit sleeves, a motor is fixedly connected to the upper side wall of the box body, the output end of the motor is fixedly connected with a first belt pulley, the first belt pulley and the second belt pulley are connected through belt transmission, an opening is formed in the upper side wall of the box body, a belt penetrates through the opening, and first bevel gears are fixedly connected to the two ends of the drive rod. The height of the detection ball can be adjusted according to needs, the resistance to the detection ball can be changed by using the fan, and the distance between the first photoelectric door and the second photoelectric door can be adjusted by arranging the screw rod, the thread block and the third rotating rod.
Description
The application is a divisional application of a physical teaching demonstration device for gravitational acceleration, wherein the application date is 2018, 05, 28 and the application number is CN 201810522321.6.
Technical Field
The invention relates to the technical field of demonstration devices, in particular to a physical teaching demonstration device for gravitational acceleration and a using method thereof.
Background
The free-fall motion is derived from gravity, and the motion of an object falling from a relative rest under the action of gravity alone is called free-fall motion, such as a physical phenomenon occurring after a hand is lightly released under an ideal condition that the object is held by the hand and no external force is applied. The acceleration of the free-falling body is a constant. It is a uniform acceleration linear motion with an initial velocity of zero. When students learn courses relating to free-fall movements, the knowledge of the free-fall movements needs to be deepened with the aid of a presentation device. The traditional free falling body demonstration device is inconvenient to adjust the height of a measured object and the distance between photoelectric doors, is not visual in demonstration and hardly arouses learning interest.
Disclosure of Invention
The invention aims to solve the problems that the height adjustment of a measured object and the distance adjustment between photoelectric doors are inconvenient, the demonstration is not visual and the study interest is difficult to arouse in the traditional free falling body demonstration device for students in the prior art, and provides a physical teaching demonstration device for gravitational acceleration.
In order to achieve the purpose, the invention adopts the following technical scheme:
a physical teaching demonstration device for gravitational acceleration comprises a box body, wherein two fixed rods are fixedly connected to the inner top wall of the box body, the lower ends of the fixed rods are fixedly connected with limiting sleeves, driving rods are commonly inserted into the two limiting sleeves, a second belt wheel is fixedly sleeved on the outer side of each driving rod between the two limiting sleeves, a motor is fixedly connected to the upper side wall of the box body, the output end of the motor is fixedly connected with a first belt wheel, the first belt wheel is connected with the second belt wheel through belt transmission, an opening is formed in the upper side wall of the box body, a belt penetrates through the opening, first bevel gears are fixedly connected to the two ends of each driving rod, outer threaded rods are rotatably connected to the inner top walls of the box body, which are positioned on the two sides of the two first bevel gears, and second bevel gears are fixedly sleeved on the outer threaded rods, the second bevel gear is meshed with the first bevel gear, an inner threaded rod is sleeved on the outer thread of the lower end of the outer threaded rod, a moving plate is fixedly connected to the lower end of the inner threaded rod, two groups of clamping devices are fixedly connected to the lower side wall of the moving plate, a detection ball is clamped between the clamping devices, an arc-shaped groove matched with the detection ball is formed in the lower side wall of the moving plate, a first photoelectric door is connected between the inner side walls of the box body below the detection ball in a sliding mode, a second photoelectric door is connected between the inner side walls of the box body below the first photoelectric door in a sliding mode, both the first photoelectric door and the second photoelectric door are connected with a timing device, a lead screw is rotatably connected between the inner side walls of the box body between the first photoelectric door and the second photoelectric door, one end of the lead screw penetrates through the side wall of the box body and is fixedly connected with a handle, and two threaded blocks are connected to the lead screw in a threaded mode, each thread block is rotatably connected with two third rotating rods, the two third rotating rods positioned on the same thread block are respectively rotatably connected with a first photoelectric door and a second photoelectric door, both sides of the first photoelectric door and the second photoelectric door are fixedly connected with limit blocks, the inner side walls of the front side and the back side of the box body are respectively provided with limit grooves, vertical rods are fixedly connected in the limit grooves, the limit blocks are sleeved on the vertical rods, the outer side wall of one side of the box body is fixedly connected with a locking device, the locking device is positioned below a handle, an arc-shaped buffer plate is slidably connected between the inner walls of the box body positioned below the second photoelectric door, rubber pads are bonded on the upper side walls of the arc-shaped buffer plate, two symmetrically arranged connecting blocks are fixedly connected on the lower side wall of the arc-shaped buffer plate, a bottom plate is fixedly connected with the inner bottom wall of the box body, and two first buffer grooves and two second buffer grooves are formed in the bottom plate, the equal fixedly connected with second spring of first dashpot inner wall, the first movable block of the other end fixedly connected with of second spring, second dashpot inner wall fixedly connected with third spring, the other end fixedly connected with second movable block of third spring, it is connected with first dwang to rotate on the second movable block, it is connected with the second dwang to rotate on the first movable block, second dwang upper end is rotated with the connecting block and is connected, the first dwang other end rotates with second dwang middle part position and is connected, the goal has been seted up to box one side lateral wall, is located the goal exit rotate on the box lateral wall and be connected with the collection ball frame, tie up in the collection ball frame and collect the ball net, through bolted connection between collection ball frame and the box.
Preferably, the first pulley and the second pulley are of the same size, and the width of the opening is greater than the sum of the diameter of the first pulley and the thickness of the belt.
Preferably, every group clamping device is including two second fixed blocks, two of equal fixed connection lateral wall under the movable plate fixedly connected with gag lever post between the second fixed block, every the slider has all been cup jointed in the equal slip on the gag lever post, lateral wall fixedly connected with draws the piece under the slider, two draw the equal fixedly connected with pull rod of one side lateral wall that the piece deviates from each other, the shifting chute with the pull rod assorted has all been seted up to box both sides lateral wall, the other end of pull rod passes shifting chute and fixedly connected with second and draws the piece.
Preferably, the locking device comprises a fixing plate fixedly connected to the outer side wall of the box body, a connecting rod is inserted into the fixing plate, a U-shaped clamping block is fixedly connected to the upper end of the connecting rod, the inner wall of the U-shaped clamping block is in contact with the lead screw, a pull plate is fixedly connected to the lower end of the connecting rod, two first springs are fixedly connected between the pull plate and the fixing plate, the two first springs are distributed on two sides of the connecting rod, and a pull ring is fixedly connected to the lower side wall of the pull plate.
Preferably, the first photogate and the second photogate have the same specification parameters and are both in a concave structure.
Preferably, the box body is of a transparent structure, scales are arranged on the box body, and the length of the scales is larger than the distance between the first photoelectric door and the second photoelectric door.
Preferably, a fan is fixedly connected to the inner side wall of the box body between the first photoelectric door and the second photoelectric door, and the model of the fan is CY-150P.
Preferably, the thread directions of the two ends of the screw rod are opposite, and the internal threads inside the thread block are matched with the threads of the screw rod.
The invention has the following beneficial effects: the detection ball can be clamped by arranging two arc-shaped clamping plates, the pull rod, the first pull block, the sliding block and the fourth rotating rod are arranged, so that the pull rod can be pulled to drive the first pull block to move, the first pull block drives the sliding block to move, the sliding block drives the fourth rotating rod to move, the two fourth rotating rods drive the two arc-shaped clamping plates to rotate, the release of the detection ball is realized, the height of the detection ball is conveniently observed by arranging scales, the motor, the first belt pulley, the belt, the second belt pulley, the first bevel gear, the second bevel gear, the external threaded rod and the internal threaded rod are arranged, so that the motor can drive the first belt pulley to rotate, the second belt pulley is driven by the belt to rotate, the first bevel gear is driven to rotate by the transmission of the driving rod, the external threaded rod rotates, the movement of the internal threaded rod is realized, and the movement of the movable plate is realized, thereby can adjust the release height that detects the ball, through setting up the fan, change the different resistances to detecting the ball to obtain more accurate data, can realize the cushioning effect to detecting the ball through setting up arc buffer board and rubber pad, avoid causing the damage to the device when falling to the ground.
Drawings
FIG. 1 is a schematic structural diagram of a physical teaching demonstration apparatus for gravitational acceleration according to the present invention;
FIG. 2 is a schematic side view of a portion of a gravity acceleration teaching demonstration apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of part A of a physical teaching demonstration apparatus for gravitational acceleration according to the present invention;
FIG. 4 is a schematic structural diagram of part B of a gravitational acceleration physical teaching demonstration apparatus according to the present invention;
FIG. 5 is a schematic view of a part of a gravity acceleration physical teaching demonstration apparatus according to the present invention;
fig. 6 is a schematic structural view of a first photoelectric gate of the device for demonstrating physics teaching of gravitational acceleration according to the present invention.
In the figure: the device comprises a box body 1, a motor 2, a belt 3, a first belt pulley 4, a second belt pulley 5, a limiting sleeve 6, a fixing rod 7, an internal threaded rod 8, a first bevel gear 9, an external threaded rod 10, a second bevel gear 11, a first fixing block 12, a movable plate 13, a detection ball 14, an arc-shaped clamping plate 15, a first photoelectric door 16, a second photoelectric door 17, a fan 18, an arc-shaped buffer plate 19, a connecting block 20, a first rotating rod 21, a second rotating rod 22, a first moving block 23, a second moving block 24, a bottom plate 25, a ball net 26, a third rotating rod 27, a screw rod 28, a thread block 29, a handle 30, a U-shaped clamping block 31, a connecting rod 32, a first pulling block 33, a fourth rotating rod 34, a second fixing block 35, a limiting rod 36, a pulling rod 37, a sliding block 38, a limiting block 39, a fixing plate 40, a pulling plate 41 and a vertical rod 42.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-6, a gravity acceleration physical teaching demonstration device, comprising a box body 1, two fixed rods 7 fixedly connected to the inner top wall of the box body 1, position-limiting sleeves 6 fixedly connected to the lower ends of the fixed rods 7, driving rods jointly inserted into the two position-limiting sleeves 6, a second belt pulley 5 fixedly sleeved on the outer side of the driving rod between the two position-limiting sleeves 6, a motor 2 fixedly connected to the upper side wall of the box body 1, the motor 2 being a servo motor, the servo motor being of the SGMJV-04ADA21 type, a first belt pulley 4 fixedly connected to the output end of the motor 2, the first belt pulley 4 being in transmission connection with the second belt pulley 5 through a belt 3, an opening formed in the upper side wall of the box body 1, the first belt pulley 4 being of the same size as the second belt pulley 5, the width of the opening being greater than the sum of the diameter of the first belt pulley 4 and the thickness of the belt 3, the belt 3 passes the opening setting, and the equal fixedly connected with first bevel gear 9 in both ends of actuating lever, roof all rotate in the box 1 that is located two first bevel gear 9 both sides and are connected with external screw thread pole 10, and external screw thread pole 10 external fixation cover is equipped with second bevel gear 11, second bevel gear 11 and first bevel gear 9 intermeshing.
The external thread of the lower end of the external thread rod 10 is sleeved with an internal thread rod 8, the lower end of the internal thread rod 8 is fixedly connected with a movable plate 13, the lower side wall of the movable plate 13 is fixedly connected with two groups of clamping devices, each group of clamping devices comprises two second fixed blocks 35 which are fixedly connected with the lower side wall of the movable plate 13, a limiting rod 36 is fixedly connected between the two second fixed blocks 35, a sliding block 38 is sleeved on each limiting rod 36 in a sliding manner, a pull block 33 is fixedly connected with the lower side wall of the sliding block 38, a pull rod 37 is fixedly connected with one side wall of each pull block 33, the side wall of each pull block 33, which is opposite to each other, moving grooves matched with the pull rods 37 are formed in the side walls of the two sides of the box body 1, the other end of each pull rod 37 passes through the moving grooves and is fixedly connected with the second pull blocks, the detection ball 14 is clamped between the clamping devices, the lower side wall of the movable plate 13 is provided with arc grooves matched with the detection ball 14, and a first photoelectric door 16 is connected between the inner side wall of the box body 1 below the detection ball 14 in a sliding manner, the second photoelectric door 17 is slidably connected between the inner side walls of the box body 1 below the first photoelectric door 16, the first photoelectric door 16 and the second photoelectric door 17 are both connected with a timing device, a fan 18 is fixedly connected on the inner side wall of the box body 1 between the first photoelectric door 16 and the second photoelectric door 17, and the fan 18 is CY-150P in model.
The box body 1 is of a transparent structure, so that the demonstration process is more convenient to observe and operate, scales are arranged on the box body 1, the length of the scales is larger than the distance between the first photoelectric door and the second photoelectric door, the specification parameters of the first photoelectric door 16 and the second photoelectric door 17 are the same, the photoelectric door is a door-like device, a light-emitting device is installed while a receiving device is installed and connected with a timing device, when an object passes through the photoelectric door, light is blocked, a timer starts timing, and when the object leaves, timing is stopped, so that the moving speed of the object can be calculated according to the size of the object and the moving time; if the timing device has the operation function, the instantaneous speed of an object can be directly measured by using a randomly configured light blocking sheet (with a certain width), the photoelectric gate consists of a small light-gathering bulb and a photosensitive tube, the light-gathering bulb is aligned to the photosensitive tube, and a small hole is arranged in front of the photosensitive tube and can receive the illumination of light. The light-sensitive gate is coupled to the timer in the following manner. When any one of the two photoelectric doors is blocked, the timer starts to count time; when any one of the two photoelectric doors is blocked by light again, the timing is terminated, the timer displays the time interval between two light blocking, and the two photoelectric doors are of a concave structure, a screw rod 28 is rotatably connected between the inner side walls of the box body 1 between the first photoelectric door 16 and the second photoelectric door 17, one end of the screw rod 28 penetrates through the side wall of the box body 1 and is fixedly connected with a handle 30, two thread blocks 29 are connected with the screw rod 28 in a threaded manner, the thread directions of the two ends of the screw rod 28 are opposite, the internal threads inside the thread blocks 29 are matched with the threads of the screw rod 28, two third rotating rods 27 are rotatably connected with each thread block 29, the two third rotating rods 27 on the same thread block 29 are respectively rotatably connected with the first photoelectric door 16 and the second photoelectric door 17, both sides of the first photoelectric door 16 and the second photoelectric door 17 are fixedly connected with a limiting block 39, the inner side walls of the front side and the back side of the box body 1 are provided with limiting grooves, a vertical rod 42 is fixedly connected in the limiting groove, a limiting block 39 is sleeved on the vertical rod 42, the handle 30 is rotated to drive the screw rod 28 to rotate, the screw rod 28 drives the thread block 29 to move, the thread block 29 drives the third rotating rod 27 to move, the third rotating rod 27 drives the first photoelectric door 16 and the second photoelectric door 17 to move, so that the distance between the two photoelectric doors can be adjusted, a locking device is fixedly connected to the outer side wall of one side of the box body 1, the locking device comprises a fixing plate 40 fixedly connected to the outer side wall of the box body 1, a connecting rod 32 is inserted in the fixing plate 40, a U-shaped clamping block 31 is fixedly connected to the upper end of the connecting rod 32, the inner wall of the U-shaped clamping block 31 is contacted with the screw rod 28, a pull plate 41 is fixedly connected to the lower end of the connecting rod 32, two first springs are fixedly connected between the pull plate 41 and the fixing plate 40, and the two first springs are distributed on two sides of the connecting rod 32, side wall fixedly connected with pull ring under arm-tie 41, through setting up U-shaped clamp splice 31, loosen the pull ring, under the elasticity of first spring, drive arm-tie 41 and remove, arm-tie 41 drives connecting rod 32 and removes, connecting rod 32 drives U-shaped clamp splice 31 and removes, make it offset with lead screw 28, realize fixed effect, prevent handle 20's rotation, the pulling ring, the pull ring drives arm-tie 41 and connecting rod 32 and removes, connecting rod 32 drives U-shaped clamp splice 31 and lead screw 28 separation, locking device is located handle 30's below.
An arc-shaped buffer plate 19 is slidably connected between the inner walls of the box body 1 below the second photoelectric door 17, a rubber pad is bonded on the upper side wall of the arc-shaped buffer plate 19, two connecting blocks 20 which are symmetrically arranged are fixedly connected on the lower side wall of the arc-shaped buffer plate 19, a bottom plate 25 is fixedly connected on the inner wall of the box body 1, two first buffer grooves and two second buffer grooves are arranged in the bottom plate 25, second springs are fixedly connected on the inner walls of the first buffer grooves, a first moving block 23 is fixedly connected on the other ends of the second springs, a third spring is fixedly connected on the inner wall of the second buffer groove, a second moving block 24 is fixedly connected on the other end of the third spring, a first rotating rod 21 is rotatably connected on the second moving block 24, a second rotating rod 22 is rotatably connected on the first moving block 23, the upper end of the second rotating rod 22 is rotatably connected with the connecting blocks 20, and the other end of the first rotating rod 21 is rotatably connected with the middle position of the second rotating rod 22, when receiving the impact of detecting ball 14, the rubber pad on the arc buffer board 19 can play certain cushioning effect, second dwang 22 and first dwang 21 also can take place to rotate simultaneously, drive first movable block 23 and second movable block 24 and remove towards opposite direction, the second spring and then the deformation takes place for the third spring, also play the effect of buffering, box 1 one side lateral wall has seted up out the ball mouth, it has the collection ball frame to be located to rotate on the box 1 lateral wall of play ball mouth exit, it has collection ball net 26 to tie up in the collection ball frame, through bolted connection between collection ball frame and the box 1, when needs take out detection ball 14, lift the bolt off, will collect detection ball 14 in the ball net 26 and take out.
In the invention, a user firstly puts a detection ball between two arc-shaped clamping plates 15, then turns on a motor 2, the motor 2 drives a first belt pulley 4 to rotate, the first belt pulley 4 drives a second belt pulley 5 to rotate through a belt 3, the second belt pulley 5 drives a driving rod to rotate, the driving rod drives two first bevel gears 9 to rotate, the first bevel gear 9 drives a second bevel gear 11 to rotate, the second bevel gear 11 drives an outer threaded rod 10 to rotate, the outer threaded rod 10 drives an inner threaded rod 8 to move, the inner threaded rod 8 drives a movable plate 13 to move, so that the arc-shaped clamping plates arranged on the movable plate 13 through a first fixing block 12 drive the detection ball 14 to move, thereby adjusting the release height of the detection ball 14 according to requirements, releasing the detection ball 14 at different heights to measure acceleration, pulling two second pulling blocks drive a pull rod 37 to move, the pull rod 37 drives the slide block 38 to move, the slide block 38 drives the fourth rotating rod 34 to move, the fourth rotating rod 34 pulls the arc-shaped clamping plate 15, so that the arc-shaped clamping plate 15 is separated from the detection ball 14, the detection ball 14 falls at the speed of zero initial speed, and the first photoelectric door 16 and the second photoelectric door 17 are used by the detection ball, and the basic principle of the detection ball is as follows: in a very short timeThe average speed can be approximated as the instantaneous speed v at that time d/Δ t, the instantaneous speed through the first and second photogates 16, 17 is calculated, the distance between the two photogates is calculated by a scale, and the equation S is (v ═ d/[ delta ] t1 2-vo 2) And (2a), calculating the acceleration a, obtaining average data through multiple experiments, finally dropping the detection ball 14 on the arc-shaped buffer plate 19, buffering by using an upper rubber pad of the arc-shaped buffer plate 19, dropping the detection ball 14 into the collection ball net 26 through a ball outlet, and measuring the value of the gravity acceleration by increasing the variable by opening the fan.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A physical teaching demonstration device for gravitational acceleration comprises a box body (1), a movable plate (13), a detection ball (14), a first photoelectric door (16) slidably connected between the inner side walls of the box body (1) below the detection ball (14), a second photoelectric door (17) slidably connected between the inner side walls of the box body (1) below the first photoelectric door (16), timing devices connected with the first photoelectric door (16) and the second photoelectric door (17), and is characterized in that the inner top wall of the box body (1) is fixedly connected with two fixed rods (7), the lower ends of the fixed rods (7) are fixedly connected with limit sleeves (6), driving rods are jointly inserted into the two limit sleeves (6), a second belt pulley (5) is fixedly connected to the outer side of the driving rod between the two limit sleeves (6), and a motor (2) is fixedly connected to the side wall of the box body (1), the output end of the motor (2) is fixedly connected with a first belt pulley (4), the first belt pulley (4) is in transmission connection with a second belt pulley (5) through a belt (3), the side wall of the box body (1) is provided with an opening, the belt (3) penetrates through the opening, two ends of the driving rod are fixedly connected with first bevel gears (9), the inner top walls of the box body (1) positioned at two sides of the two first bevel gears (9) are rotatably connected with outer threaded rods (10), the outer threaded rods (10) are fixedly sleeved with second bevel gears (11), the second bevel gears (11) are meshed with the first bevel gears (9), the outer threads at the lower ends of the outer threaded rods (10) are sleeved with inner threaded rods (8), the lower ends of the inner threaded rods (8) are fixedly connected with two groups of clamping devices, and the lower side wall of the movable plate (13) is fixedly connected with two groups of clamping devices, the detection ball (14) is clamped between the clamping devices, the lower side wall of the movable plate (13) is provided with arc-shaped grooves matched with the detection ball (14), the inner side wall of the box body (1) between the first photoelectric door (16) and the second photoelectric door (17) is rotatably connected with a lead screw (28), one end of the lead screw (28) penetrates through the side wall of the box body (1) and is fixedly connected with a handle (30), the lead screw (28) is in threaded connection with two thread blocks (29), each thread block (29) is rotatably connected with two third rotating rods (27), the two third rotating rods (27) on the same thread block (29) are respectively rotatably connected with the first photoelectric door (16) and the second photoelectric door (17), and the two sides of the first photoelectric door (16) and the second photoelectric door (17) are both fixedly connected with a limiting block (39), the inner side walls of the front side and the rear side of the box body (1) are respectively provided with a limiting groove, a vertical rod (42) is fixedly connected in the limiting grooves, a limiting block (39) is sleeved on the vertical rod (42), the outer side wall of one side of the box body (1) is fixedly connected with a locking device, the locking device is positioned below the handle (30), an arc-shaped buffer plate (19) is slidably connected between the inner walls of the box body (1) and positioned below the second photoelectric door (17), a rubber pad is bonded on the side wall of the arc-shaped buffer plate (19), two symmetrically arranged connecting blocks (20) are fixedly connected on the side wall of the arc-shaped buffer plate (19), a bottom plate (25) is fixedly connected on the inner side wall of the box body (1), two first buffer grooves and two second buffer grooves are arranged in the bottom plate (25), second springs are fixedly connected on the inner walls of the first buffer grooves, and a first moving block (23) is fixedly connected on the other ends of the second springs, the inner wall of the second buffer groove is fixedly connected with a third spring, the other end of the third spring is fixedly connected with a second moving block (24), the second moving block (24) is rotatably connected with a first rotating rod (21), the first moving block (23) is rotatably connected with a second rotating rod (22), the upper end of the second rotating rod (22) is rotatably connected with a connecting block (20), the other end of the first rotating rod (21) is rotatably connected with the middle position of the second rotating rod (22), a ball outlet is formed in the side wall of one side of the box body (1), a collecting ball frame is rotatably connected to the outer side wall of the box body (1) at the ball outlet, a collecting ball net (26) is tied in the collecting ball frame, and the collecting ball frame is connected with the box body (1) through bolts;
each group of clamping devices comprises two second fixing blocks (35) which are fixedly connected to the lower side wall of the movable plate (13), a limiting rod (36) is fixedly connected between the two second fixing blocks (35), a sliding block (38) is sleeved on each limiting rod (36) in a sliding manner, a pull block (33) is fixedly connected to the lower side wall of each sliding block (38), pull rods (37) are fixedly connected to the side walls of the two pull blocks (33) on the sides which are away from each other, moving grooves matched with the pull rods (37) are formed in the side walls of the two sides of the box body (1), and the other ends of the pull rods (37) penetrate through the moving grooves and are fixedly connected with the second pull blocks;
the locking device comprises a fixing plate (40) fixedly connected to the outer side wall of the box body (1), a connecting rod (32) is inserted into the fixing plate (40), a U-shaped clamping block (31) is fixedly connected to the upper end of the connecting rod (32), the inner wall of the U-shaped clamping block (31) is in contact with a screw rod (28), a pull plate (41) is fixedly connected to the lower end of the connecting rod (32), two first springs are fixedly connected between the pull plate (41) and the fixing plate (40) and distributed on two sides of the connecting rod (32), and pull rings are fixedly connected to the lower side wall of the pull plate (41).
2. A device for demonstrating the physical teaching of the acceleration of gravity according to claim 1, characterized in that said first pulley (4) and said second pulley (5) are of the same size, and the width of said opening is greater than the sum of the diameter of the first pulley (4) and the thickness of the belt (3).
3. The device for demonstrating physics of gravitational acceleration according to claim 1, characterized in that said first photoelectric gate (16) and said second photoelectric gate (17) have the same specification parameters and are both in a concave structure.
4. The gravity acceleration physical teaching demonstration device according to claim 1, wherein the box body (1) is of a transparent structure, and scales are arranged on the box body (1), and the length of the scales is larger than the distance between the first photoelectric door (16) and the second photoelectric door (17).
5. The gravity acceleration physical teaching demonstration device according to claim 1, wherein a fan (18) is fixedly connected to the inner side wall of the box body (1) between the first photoelectric door (16) and the second photoelectric door (17), and the type of the fan (18) is CY-150P.
6. The gravitational acceleration physical teaching demonstration device according to claim 1, wherein the screw rod (28) has opposite thread directions at both ends, and the internal thread inside the screw block (29) is matched with the thread of the screw rod (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911392321.XA CN111081122B (en) | 2018-05-28 | 2018-05-28 | Physical teaching demonstration device for gravitational acceleration and use method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810522321.6A CN108777105B (en) | 2018-05-28 | 2018-05-28 | Physical teaching demonstration device for gravitational acceleration |
| CN201911392321.XA CN111081122B (en) | 2018-05-28 | 2018-05-28 | Physical teaching demonstration device for gravitational acceleration and use method thereof |
Related Parent Applications (1)
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| CN108777105A (en) | 2018-11-09 |
| CN111081122A (en) | 2020-04-28 |
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