CN217484996U

CN217484996U - Gravity trolley track for teaching experiments

Info

Publication number: CN217484996U
Application number: CN202220544108.7U
Authority: CN
Inventors: 李超; 赵亮
Original assignee: Chongqing Chongkezi Technology Co ltd
Current assignee: Chongqing Chongkezi Technology Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-09-23
Anticipated expiration: 2032-03-09

Abstract

The utility model provides a gravity dolly track for teaching experiments belongs to teaching equipment technical field to solve the problem that the gravity dolly track for teaching experiments of prior art can not launch many gravity dollies simultaneously, include: the track component comprises a straight track, an inclined plane track arranged at one end of the straight track, and a plurality of groups of arc tracks with one ends connected with the inclined plane track, the other ends of the arc tracks are connected with the straight track, the included angle between the inclined plane track and the horizontal plane is alpha, and alpha is more than 0 degree and less than 90 degrees; the departure mechanism comprises a departure support fixedly connected to the inclined track, a rotating shaft rotatably connected with the departure support, and a plurality of gear rods fixedly connected to the rotating shaft in an array manner; the gravity trolley is placed at the rear part of the stop lever; the starting point position sensor is arranged on the departure support and can detect the rotating position of the rotating shaft, the end point support is arranged at the other end of the straight track, and the end point support is provided with a plurality of end point position sensors.

Description

Gravity trolley track for teaching experiments

Technical Field

The utility model belongs to the technical field of the teaching equipment, more specifically say, in particular to gravity dolly track for teaching experiments.

Background

The model is a traditional science and technology project, and is deeply loved by the masses of teenagers due to unique knowledge and interestingness. In general teaching experiments, particularly physical experiments, various trolley models are essential elements for exploring the physical principle, and students can further explore the scientific essence of the motion model through the trolley simulation motion process.

As in application No.: CN 201710356609.6.

Based on the above patent search, and in conjunction with the discovery of prior art devices, the prior art track does not solve the problem of launching multiple gravity vehicles simultaneously.

Therefore, in view of this, research and improvement are performed on the existing structure and defects, and a gravity trolley track for teaching experiments is provided, so as to achieve the purpose of having more practical value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a gravity dolly track for teaching experiments to solve the problem that the gravity dolly track for teaching experiments of prior art can not launch a plurality of gravity dollies simultaneously.

The utility model relates to a purpose and efficiency of gravity dolly track for teaching experiments is reached by following specific technological means:

a gravity trolley track for teaching experiments, comprising:

the track component comprises a straight track, an inclined plane track arranged at one end of the straight track, and a plurality of groups of arc tracks of which one ends are connected with the inclined plane track, the other ends of the arc tracks are connected with the straight track, the included angle between the inclined plane track and the horizontal plane is alpha, and alpha is more than 0 degree and less than 90 degrees;

the train dispatching mechanism comprises a train dispatching support fixedly connected to the inclined plane track, a rotating shaft rotatably connected with the train dispatching support, and a plurality of gear rods fixedly connected to the rotating shaft in an array manner, wherein the gear rods are distributed along the axial direction of the rotating shaft and are in transmission connection with a rotating mechanism;

a plurality of gravity trolleys are arranged on the inclined plane track side by side and are arranged at the rear part of the stop rod;

the system is characterized in that a starting point position sensor is arranged on the departure support and can detect the rotating position of the rotating shaft, a terminal point support is arranged at the other end of the straight track, a plurality of terminal point position sensors are mounted on the terminal point support, the number of the terminal point position sensors is consistent with that of gravity trolleys and corresponds to that of the gravity trolleys one by one, and the terminal point position sensors respectively detect the time when the trolleys at corresponding positions reach the terminal point support.

Further, the straight track and the inclined plane track are formed by one track unit or formed by splicing more than two track units, each track unit comprises a flat plate, side baffles arranged on two sides of the flat plate, and a plurality of guide convex parts arranged transversely, each guide convex part comprises two convex strips arranged in parallel, and the two convex strips guide the moving direction of the trolley.

Further, the arc track is arc connecting elements, arc connecting elements includes two inboard arc dogs and two outside arc dogs, two inboard arc dogs set up in two between the outside arc dogs, the cambered surface one end and the orbital sand grip smooth connection of straight of inboard arc dog, the cambered surface other end and the orbital sand grip smooth connection of inclined plane of inboard arc dog, the cambered surface width and the sand grip width of inboard arc dog are unanimous.

Further, the arc track is the arc connecting seat, the arc connecting seat includes supporting part, fixed connection in the track cambered surface on supporting part upper portion, transverse arrangement in a plurality of guide rail portions of track cambered surface, guide rail portion upper portion and the orbital sand grip smooth connection in inclined plane, guide rail portion lower part and straight orbital sand grip smooth connection, guide rail portion width is unanimous with the sand grip width.

Furthermore, the arc-shaped track is a flexible connecting piece, the flexible connecting piece comprises a docking plate and a plurality of flexible guide rails which are transversely arranged, the flexible guide rails are formed by longitudinally arranging a plurality of convex blocks, the convex blocks are fixedly connected to the upper surface of the docking plate, the docking plate is connected with the straight track and the inclined plane track along the distribution direction of the convex blocks, and the flexible guide rails are arranged corresponding to the convex strips.

Furthermore, the rotating mechanism is a steering engine, and the steering engine is in transmission connection with one end of the rotating shaft.

Furthermore, the rotating mechanism is a handle fixedly connected to one end of the rotating shaft.

Furthermore, the lower part of the rear side of the inclined plane track is connected with a rear support frame.

Furthermore, the rear support frame is a fixed support, the fixed support comprises a transverse support frame fixedly connected with the lower end of the inclined plane track, and a longitudinal support frame fixedly connected with the lower end of the inclined plane track and the rear part of the transverse support frame, and the upper part of the longitudinal support frame is fixedly connected with the upper part of the inclined plane track.

Furthermore, the rear support frame is an adjusting support frame, the adjusting support frame comprises a transverse support frame and an adjusting longitudinal support column, the lower end of the adjusting longitudinal support column is fixedly connected with the transverse support frame, the adjusting longitudinal support column comprises a sleeve, the lower end of the sleeve is fixedly connected with the transverse support frame, a telescopic rod is sleeved in the sleeve in a sliding mode, a sliding locking component is installed at the upper end of the telescopic rod, and a buckling component is installed on the outer circumference of the sleeve;

a through hole penetrates through the upper part and the lower part of the sleeve, a sliding hole is formed in the circumferential side wall of the upper part of the sleeve, and the sliding hole is communicated with the through hole;

a plurality of tooth sockets are arrayed on the telescopic rod along the axial direction of the telescopic rod;

the sliding locking component comprises a sliding block hinged with the upper end of the telescopic rod and a locking knob in threaded connection with the sliding block, and the sliding block can be locked on the inclined track by the locking knob;

the clamping buckle component comprises a clamping block arranged in the sliding hole in a sliding mode, a spring, a buckle cover and a prying piece, one end of the spring is fixedly connected with the side portion of the clamping block, the buckle cover is fixedly connected to the outer circumferential wall of the sleeve, the middle of the prying piece is rotatably connected with the outer circumferential wall of the sleeve, the other end of the spring is fixedly connected with the buckle cover, and the prying piece can pry the clamping block to move towards the right side;

the inclined plane track lower extreme is provided with the articulated frame, the articulated frame includes the articulated elements that are connected with straight track rear end fixed connection's first articulated rod, with first articulated rod rear end, front end and articulated elements are connected's second articulated rod, second articulated rod and inclined plane track lower extreme fixed connection.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides a gravity dolly track for teaching experiments can launch many gravity dollies simultaneously. The same track and different gravity trolleys combine theory and reality through teaching experiments to master the relationship among gravitational potential energy, kinetic energy, inertial energy and consumption.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view (first view angle) of a second embodiment of the present invention.

Fig. 3 is a schematic perspective view (second view angle) of a second embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Fig. 5 is an enlarged schematic view of B in fig. 3.

Fig. 6 is a schematic perspective view of the track unit of the present invention.

Fig. 7 is a schematic side view of a third embodiment of the present invention.

Fig. 8 is an enlarged schematic view of C in fig. 7.

Fig. 9 is a schematic perspective view of an arc rail according to a first embodiment of the present invention.

Fig. 10 is a schematic perspective view of an arc rail according to a second embodiment of the present invention.

Fig. 11 is a schematic perspective view of an arc rail according to a third embodiment of the present invention.

Fig. 12 is a schematic perspective view of an adjusting longitudinal support according to a third embodiment of the present invention.

Fig. 13 is an enlarged schematic view of fig. 12 at D.

Fig. 14 is a schematic circuit diagram of the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

track member 1, straight track 11, inclined track 12, arc track 13, inner arc stopper 131, outer arc stopper 132, support 133, track arc 134, rail section 135, docking plate 136, flexible rail 137, protrusion 137a, track unit 10, side guards 101, guide protrusion 102, protrusion 102a

Departure mechanism 2, departure support 21, rotating shaft 22, gear lever 221, steering gear 23, starting position sensor 24, handle 25, ending support 3, ending position sensor 31,

A rear support frame 4, a transverse support frame 41, a longitudinal support frame 42, an adjusting longitudinal strut 43, a hinge bracket 44, a first hinge rod 441, a hinge 442, a second hinge rod 443,

The sleeve 431, the through hole 4311, the sliding hole 4312, the telescopic rod 432, the toothed groove 4321, the sliding locking member 433, the sliding block 4331, the locking knob 4332, the buckling member 434, the clamping block 4341, the spring 4342, the buckling cover 4343, the pry plate 4344 and the gravity trolley 5.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of 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. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

as shown in figures 1 to 13:

the utility model provides a gravity dolly track for teaching experiments, include:

the track component 1 comprises a straight track 11, an inclined plane track 12 arranged at one end of the straight track 11, and a plurality of groups of arc tracks 13 with one ends connected with the inclined plane track 12, wherein the other ends of the arc tracks 13 are connected with the straight track 11, the included angle between the inclined plane track 12 and the horizontal plane is alpha, and alpha is more than 0 degree and less than 90 degrees;

the departure mechanism 2, the departure mechanism 2 includes departure support 21 fixedly connected to the inclined track 12, the spindle 22 rotatably connected with the departure support 21, a plurality of shelves 221 fixedly connected to the spindle 22 in an array, the shelves 221 are distributed along the axial direction of the spindle 22, the shelves 221 are connected with the rotating mechanism in a transmission manner;

a plurality of gravity trolleys 5 are arranged on the inclined rail 12 side by side, and the gravity trolleys 5 are arranged at the rear part of the blocking rod 221;

the departure support 21 is provided with a starting point position sensor 24, the starting point position sensor 24 can detect the rotating position of the rotating shaft 22, the other end of the straight track 11 is provided with an end point support 3, the end point support 3 is provided with a plurality of end point position sensors 31, the number of the end point position sensors 31 is consistent with that of the gravity trolleys 5 and corresponds to one another, and the end point position sensors 31 respectively detect the time when the trolleys at corresponding positions reach the end point support 3.

In this embodiment, the gravity trolleys 5 are stopped at the rear portion of the stop rod 221, after the stop rod is rotated for a certain angle, the gravity trolleys 5 can slide downwards from the inclined rail 12, when the stop rod 221 rotates for a certain angle, the starting position sensor 24 can detect the original position in the disk of the stop rod 221, and start timing, so as to obtain the departure time of the gravity trolleys 5, and after the end point is reached, the end point position sensor 31 correspondingly arranged on each gravity trolley 5 detects the time when the trolley reaches the end point, so that the gravity trolleys 5 can move from the starting point to the end point.

The rotating mechanism is a steering engine 23, and the steering engine 23 is in transmission connection with one end of the rotating shaft 22. Or the rotating mechanism is that the handle 25 is fixedly connected with one end of the rotating shaft 22.

Wherein the rotating mechanism adopts a steering engine 23 or a handle 25 to rotate, and can realize the simultaneous departure of a plurality of gravity trolleys 5. Adopt steering wheel 23 control can realize automated control, through setting up controller, power, start button to realize the pivoted purpose of control pivot 22 with steering wheel 23 electric connection.

The lower part of the rear side of the inclined plane track 12 is connected with a rear support frame 4.

The rear support frame 4 is a fixed support, the fixed support comprises a transverse support frame 41 fixedly connected with the lower end of the inclined plane track 12 and a longitudinal support frame 42 fixedly connected with the lower end of the transverse support frame 41, and the upper part of the longitudinal support frame 42 is fixedly connected with the upper part of the inclined plane track 12.

The arrangement of the rear support frame 4 can make the inclined plane track 12 more stable and not easy to incline or overturn.

The straight track 11 and the inclined track 12 are formed by one track unit 10 or formed by splicing more than two track units 10, each track unit 10 comprises a flat plate 103, side baffles 101 arranged on two sides of the flat plate 103 and a plurality of guide convex parts 102 arranged transversely, each guide convex part 102 comprises two convex strips 102a arranged in parallel, and the two convex strips 102a guide the moving direction of the trolley.

Wherein, the track unit 10 can be integrally formed by bending or stamping, and the structure is simple and practical. The guide projection 102 serves to guide the direction of movement of the gravity trolley 5. When the device is used for an experiment, the gravity trolleys 5 cannot collide with each other, so that mutual interference is prevented. When carrying out the gravity dolly match through the device, the same track, different gravity dolly 5 lets the student combine theory and reality through teaching experiment, masters the relation between gravitational potential energy, kinetic energy and energy consumption. The influence of the profile of the gravity trolley 5 on the travelling speed can be derived, for example, from the speed at which the gravity trolley 5 of different profiles glides to the end point.

Arc track 13 is arc connecting means, and arc connecting means includes two inboard arc dogs 131 and two outside arc dogs 132, and two inboard arc dogs 131 set up between two outside arc dogs 132, and the cambered surface one end of inboard arc dog 131 and straight track 11's sand grip 102a smooth connection, and the cambered surface other end of inboard arc dog 131 and inclined plane track 12's sand grip 102a smooth connection, and the cambered surface width of inboard arc dog 131 is unanimous with sand grip 102a width.

The inner arc-shaped stop block 131 and the outer arc-shaped stop block 132 are arranged to enable the straight track 11 and the inclined plane track 12 to be connected smoothly, the gravity trolley 5 can smoothly slide from the inclined plane track 12 to guide the straight track 11, and the inner arc-shaped stop block 131 plays a role in guiding the moving direction of the gravity trolley 5.

As shown in fig. 14, the circuit connection of the present invention is, through the USB data line, connected with the ED (i.e. slave), to realize data transmission, the ED is powered by 18650 battery, the power supply voltage is 6-12V, and the ED is powered by the start position sensor, each end position sensor, and the steering engine, and is connected with the ED through the signal line. At first send actuating signal for the steering wheel through ED, then the steering wheel rotates, drives pivot 22 and rotates, and then realizes the departure, and at this moment, starting point position sensor sends for the ED signal of telecommunication, begins the timing, and when the car of certain lane arrived the terminal point, the terminal point position sensor meter of corresponding position sent an electric signal for ED, and ED can stop the timing this moment to reacing every car and corresponding the time of arriving the terminal point position. The integrated data information can be transmitted to the PC end and can be checked by the user.

The second embodiment:

as shown in fig. 2, 3, 6 and 10, the other structures are the same as the first embodiment, except that in this embodiment, the arc-shaped rail 13 is an arc-shaped connection seat, the arc-shaped connection seat includes a support portion 133, a rail arc surface 134 fixedly connected to an upper portion of the support portion 133, and a plurality of rail portions 135 transversely arranged on the rail arc surface 134, an upper portion of the rail portion 135 is smoothly connected to the protruding strip 102a of the inclined surface rail 12, a lower portion of the rail portion 135 is smoothly connected to the protruding strip 102a of the straight rail 11, and a width of the rail portion 135 is the same as a width of the protruding strip 102 a.

Wherein arc track 13 in this embodiment simple structure easily makes, and adopts the integration setting, when changing inclined plane track 12 inclination, can quick replacement suitable arc track 13.

Example three:

as shown in fig. 7, 8, 11, 12 and 13, the remaining structure is the same as the first embodiment, except that in this embodiment, the arc-shaped rail 13 is a flexible connector, the flexible connector includes a docking plate 136 and a plurality of flexible rails 137 arranged transversely, the flexible rails 137 are formed by a plurality of protrusions 137a arranged longitudinally, the plurality of protrusions 137a are fixedly connected to the upper surface of the docking plate 136, the docking plate 136 is connected with the straight rail 11 and the inclined rail 12 along the distribution direction of the protrusions 137a, and the flexible rails 137 are arranged corresponding to the convex strips 102 a.

Wherein the arc-shaped track 13 in this embodiment is flexibly structured, the docking plate 136 has a certain flexibility, and can be bent within a certain angle range, and the protrusions 137a are arranged on the docking plate 136 at certain intervals, so that the docking plate 136 can be bent, and can be connected with the protruding strips 102a, thereby playing a role in guiding the moving direction of the gravity trolley 5.

The docking plate 136 may be made of plastic, rubber, leather, paper, or other flexible material, and may be coated with an abrasion-resistant material or a waterproof material according to circumstances.

The rear support frame 4 is an adjusting bracket, the adjusting bracket comprises a transverse support frame 41 and an adjusting longitudinal strut 43, the lower end of the adjusting longitudinal strut 43 is fixedly connected with the transverse support frame 41, the adjusting longitudinal strut 43 comprises a sleeve 431, the lower end of the sleeve 431 is fixedly connected with the transverse support frame 41, an expansion rod 432 is slidably sleeved in the sleeve 431, a sliding locking member 433 is installed at the upper end of the expansion rod 432, and a buckling member 434 is installed on the outer circumference of the sleeve 431;

the sleeve 431 is vertically provided with a through hole 4311 in a penetrating way, the circumferential side wall of the upper part of the sleeve 431 is provided with a sliding hole 4312, and the sliding hole 4312 is communicated with the through hole 4311;

a plurality of tooth sockets 4321 are arrayed on the telescopic rod 432 along the axial direction;

the sliding locking member 433 comprises a sliding block 4331 hinged with the upper end of the telescopic rod 432, and a locking knob 4332 in threaded connection with the sliding block 4331, wherein the locking knob 4332 can lock the sliding block 4331 on the inclined track 12;

the fastening member 434 includes a fastening block 4341 slidably disposed in the sliding hole 4312, a spring 4342 having one end fixedly connected to a side of the fastening block 4341, a fastening cover 4343 fixedly connected to an outer circumferential wall of the sleeve 431, and a pry 4344 having a middle portion rotatably connected to the outer circumferential wall of the sleeve 431, wherein the other end of the spring 4342 is fixedly connected to the fastening cover 4343, and the pry 4344 can pry the fastening block 4341 to move rightward;

the lower end of the inclined plane track 12 is provided with a hinge frame 44, the hinge frame 44 comprises a first hinge rod 441 fixedly connected with the rear end of the straight track 11, a hinge element 442 connected with the rear end of the first hinge rod 441, and a second hinge rod 443 connected with the hinge element 442 at the front end, and the second hinge rod 443 is fixedly connected with the lower end of the inclined plane track 12.

Wherein, the rear support frame 4 is an adjusting support, and the inclination angle of the inclined plane track 12 can be conveniently adjusted according to the requirement. When the height of the telescopic rod 432 is adjusted to be high, the locking knob 4332 is firstly unscrewed, then the telescopic rod 432 is moved upwards, the tooth groove 4321 of the telescopic rod 432 is buckled with the clamping block 4341 of the buckling member 434, the telescopic rod 432 can be limited to move downwards continuously, the clamping block 4341 can be pried to move towards the side part by pressing the prying sheet 4344, then the telescopic rod 432 is moved downwards for a certain distance, so that the height is adjusted step by step, and the locking knob 4332 is screwed after the height is adjusted to prevent the sliding block 4331 and the inclined plane track 12 from sliding relatively. When the inclined track 12 is adjusted in the inclined angle, the docking plate 136 can change the curvature along with the rotation of the hinge 442.

The specific use mode and function of the embodiment are as follows:

the utility model discloses when using, place a plurality of gravity dollies 5 on inclined plane track 12, keep off with shelves pole 221, later rotate pivot 22, a plurality of gravity dollies 5 are dispatched a car simultaneously, and starting point position sensor 24 times simultaneously, and when gravity dolly 5 reachs the terminal point, the arrival time of gravity dolly 5 is measured to the terminal point position sensor 31 of every gravity dolly 5 corresponding position.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a gravity dolly racetrack for teaching experiments which characterized in that: the method comprises the following steps:

the track component (1) comprises a straight track (11), an inclined plane track (12) arranged at one end of the straight track (11), and a plurality of groups of arc-shaped tracks (13) with one ends connected with the inclined plane track (12), wherein the other ends of the arc-shaped tracks (13) are connected with the straight track (11), the inclined plane track (12) and a horizontal plane form an included angle alpha, and the angle alpha is more than 0 degree and less than 90 degrees;

the system comprises a departure mechanism (2), wherein the departure mechanism (2) comprises a departure support (21) fixedly connected to an inclined track (12), a rotating shaft (22) rotatably connected with the departure support (21), and a plurality of stop rods (221) fixedly connected to the rotating shaft (22) in an array manner, the stop rods (221) are distributed along the axial direction of the rotating shaft (22), and the stop rods (221) are in transmission connection with a rotating mechanism;

a plurality of gravity trolleys (5) are arranged on the inclined plane track (12) side by side, and the gravity trolleys (5) are arranged at the rear part of the blocking rod (221);

the starting support (21) is provided with a starting position sensor (24), the starting position sensor (24) can detect the rotating position of the rotating shaft (22), the other end of the straight track (11) is provided with a terminal support (3), the terminal support (3) is provided with a plurality of terminal position sensors (31), the number of the terminal position sensors (31) is consistent with that of the gravity trolleys (5) and corresponds to that of the gravity trolleys one by one, and the terminal position sensors (31) respectively detect the time when the trolleys in corresponding positions reach the terminal support (3).

2. The gravity trolley race track for teaching experiments as claimed in claim 1, wherein: the straight track (11) and the inclined plane track (12) are formed by one track unit (10) or formed by splicing more than two track units (10), each track unit (10) comprises a flat plate (103), side baffles (101) arranged on two sides of the flat plate (103) and a plurality of guide convex parts (102) arranged transversely, each guide convex part (102) comprises two convex strips (102a) arranged in parallel, and the two convex strips (102a) guide the moving direction of the trolley.

3. The gravity trolley race track for teaching experiments as claimed in claim 2, wherein: arc track (13) are arc connecting elements, arc connecting elements includes two inboard arc dog (131) and two outside arc dog (132), two inboard arc dog (131) set up in two between outside arc dog (132), the cambered surface one end of inboard arc dog (131) and sand grip (102a) smooth connection of straight track (11), the cambered surface other end of inboard arc dog (131) and sand grip (102a) smooth connection of inclined plane track (12), the cambered surface width of inboard arc dog (131) is unanimous with sand grip (102a) width.

4. The gravity trolley race track for teaching experiments as claimed in claim 2, wherein: arc track (13) are the arc connecting seat, the arc connecting seat includes supporting part (133), fixed connection in track cambered surface (134) on supporting part (133) upper portion, transversely arranges in a plurality of guide rail portion (135) of track cambered surface (134), guide rail portion (135) upper portion and sand grip (102a) smooth connection of inclined plane track (12), guide rail portion (135) lower part and sand grip (102a) smooth connection of straight track (11), guide rail portion (135) width is unanimous with sand grip (102a) width.

5. The gravity trolley race track for teaching experiments as claimed in claim 2, wherein: the arc-shaped track (13) is a flexible connecting piece, the flexible connecting piece comprises a docking plate (136) and a plurality of flexible guide rails (137) which are transversely arranged, the flexible guide rails (137) are formed by longitudinally arranging a plurality of convex blocks (137a), the convex blocks (137a) are fixedly connected to the upper surface of the docking plate (136), the docking plate (136) is connected with the straight track (11) and the inclined track (12) along the distribution direction of the convex blocks (137a), and the flexible guide rails (137) are correspondingly arranged with the convex strips (102 a).

6. The gravity trolley track for teaching experiments as claimed in claim 1, wherein: the rotating mechanism is a steering engine (23), and the steering engine (23) is in transmission connection with one end of the rotating shaft (22).

7. The gravity trolley race track for teaching experiments as claimed in claim 1, wherein: the rotating mechanism is characterized in that a handle (25) is fixedly connected to one end of the rotating shaft (22).

8. The gravity trolley race track for teaching experiments as claimed in claim 1, wherein: the lower part of the rear side of the inclined plane track (12) is connected with a rear supporting frame (4).

9. The gravity trolley race track for teaching experiments as claimed in claim 8, wherein: the rear support frame (4) is a fixed support, the fixed support comprises a transverse support frame (41) fixedly connected with the lower end of the inclined plane track (12), and a longitudinal support frame (42) fixedly connected with the rear part of the transverse support frame (41), and the upper part of the longitudinal support frame (42) is fixedly connected with the upper part of the inclined plane track (12).

10. The gravity trolley track for teaching experiments as claimed in claim 8, wherein: the rear support frame (4) is an adjusting support, the adjusting support comprises a transverse support frame (41) and an adjusting longitudinal support (43) with the lower end fixedly connected with the transverse support frame (41), the adjusting longitudinal support (43) comprises a sleeve (431) with the lower end fixedly connected with the transverse support frame (41), an expansion rod (432) slidably sleeved in the sleeve (431), a sliding locking member (433) installed at the upper end of the expansion rod (432), and a buckling member (434) installed at the outer circumference of the sleeve (431);

the sleeve (431) is provided with a through hole (4311) in a vertical penetrating manner, the circumferential side wall of the upper part of the sleeve (431) is provided with a sliding hole (4312), and the sliding hole (4312) is communicated with the through hole (4311);

a plurality of tooth sockets (4321) are arranged on the telescopic rod (432) in an array along the axial direction of the telescopic rod;

the sliding locking component (433) comprises a sliding block (4331) hinged with the upper end of the telescopic rod (432) and a locking knob (4332) in threaded connection with the sliding block (4331), and the locking knob (4332) can lock the sliding block (4331) on the inclined track (12);

the buckling component (434) comprises a clamping block (4341) arranged in the sliding hole (4312) in a sliding mode, a spring (4342) with one end fixedly connected with the side portion of the clamping block (4341), a buckling cover (4343) fixedly connected to the outer circumferential wall of the sleeve (431), and a prying piece (4344) with the middle portion rotatably connected with the outer circumferential wall of the sleeve (431), the other end of the spring (4342) is fixedly connected with the buckling cover (4343), and the prying piece (4344) can pry the clamping block (4341) to move towards the right side;

the lower end of the inclined plane track (12) is provided with a hinge frame (44), the hinge frame (44) comprises a first hinge rod (441) fixedly connected with the rear end of the straight track (11), a hinge piece (442) connected with the rear end of the first hinge rod (441), and a second hinge rod (443) with the front end connected with the hinge piece (442), and the second hinge rod (443) is fixedly connected with the lower end of the inclined plane track (12).