CN110424290B

CN110424290B - A warning device for road engineering construction

Info

Publication number: CN110424290B
Application number: CN201910841728.XA
Authority: CN
Inventors: 王坚
Original assignee: CCCC First Highway Engineering Co Ltd; Third Engineering Co Ltd of Highway Engineering Bureau of CCCC
Current assignee: CCCC First Highway Engineering Co Ltd; Third Engineering Co Ltd of Highway Engineering Bureau of CCCC
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2021-09-17
Anticipated expiration: 2039-09-06
Also published as: CN110424290A

Abstract

The invention discloses a warning device for road engineering construction, which comprises two supporting blocks, wherein a driving cavity with a right opening is arranged in the supporting block on the left side, a driven cavity with a left opening is arranged in the supporting block on the right side, a driving mechanism for driving the driving device to operate is arranged in the driving cavity, a moving cavity with a right end wall communicated with an external space is arranged in the lower end wall of the driving cavity, a moving mechanism for controlling the supporting block on the right side to move left and right is arranged in the moving cavity, the upper end wall of the moving cavity is communicated with the driving cavity, the moving mechanism comprises a moving plate with the upper end positioned in the driving cavity, a first connecting rod is fixed on the right end surface of the lower end of the moving plate, when the device works, the device can be divided into two parts according to needs, so that warning boards can face two directions to provide warning information for more vehicles or pedestrians, and when the device does not need to work, the device can be moved in a pushing mode, is convenient for transferring and collecting.

Description

A warning device for road engineering construction

Technical Field

The invention relates to the field of road warning, in particular to a warning device for road engineering construction.

Background

When the construction is carried out in a road, warning signs are usually placed on the road by a construction unit to provide warning information for passing vehicles and pedestrians;

at present, most warning boards can only warn towards one direction, when warning information needs to be provided towards a plurality of directions, a plurality of warning boards need to be used, warning cost is increased, and when the warning boards are moved in a carrying mode, most people need to lift the warning boards to move, and the warning boards are very inconvenient and low in efficiency.

Disclosure of Invention

The invention aims to solve the technical problem of providing a warning device for road engineering construction, which solves the problems that the warning boards are not changed in transportation and only one warning board can provide warning information in one direction, and the like, and is more convenient to transport.

The invention is realized by the following technical scheme.

The warning device for road engineering construction comprises two supporting blocks, wherein a driving cavity with a right opening is formed in the supporting block on the left side, a driven cavity with a left opening is formed in the supporting block on the right side, a driving mechanism for driving the driving device to operate is arranged in the driving cavity, and a moving cavity with a right end wall communicated with an external space is formed in the lower end wall of the driving cavity;

a moving mechanism for controlling the supporting block on the right side to move left and right is arranged in the moving cavity, the upper end wall of the moving cavity is communicated with the driving cavity, the moving mechanism comprises a moving plate, the upper end of the moving plate is positioned in the driving cavity, a first connecting rod is fixed on the right end face of the lower end of the moving plate, the right end of the first connecting rod is rotatably connected with a rotating shaft, a transmission cavity is arranged in the lower end wall of the driven cavity, a second connecting rod, the right end of the second connecting rod is positioned in the transmission cavity, a lifting cavity with a leftward opening is arranged in the lower end of the moving plate, a spring block and a supporting spring for supporting the spring block are arranged in the lifting cavity, a rack rod with the left end positioned in the moving cavity is fixed on the left end face of the spring block, two ejection cavities communicated with the driving cavity are also arranged in the upper end of the moving plate, an ejection block with one end positioned in the driving cavity and an ejection spring for connecting the ejection block with the end wall of the ejection cavity are arranged in the ejection cavity, an electromagnet capable of being attracted towards the ejection block is fixed on the end wall of the ejection cavity close to the center of the moving plate, a lower pressing block with the lower end contacting with the spring block is further arranged in the lifting cavity, and two ropes with upper ends respectively penetrating through the end walls of the two ejection cavities and fixedly connected with the ejection blocks are fixed at the upper ends of the lower pressing blocks;

the driving mechanism drives the moving mechanism to work, so that the left supporting block and the right supporting block are separated, and then the driving mechanism works to control the driven mechanism to work, so that the right supporting block moves, and the orientation of the right supporting block is changed.

Further, actuating mechanism includes the motor, the drive chamber left end wall is fixed with the right-hand member and is located the fixed plate of driven intracavity, motor lower extreme power connection has the lower extreme to run through the fixed plate and remove the chamber upper end wall and be located remove the drive shaft of intracavity, the drive shaft upper end is fixed with first belt pulley just the drive shaft lower extreme is fixed with drive gear, the rack bar with the meshing of drive gear rear end is connected, be equipped with in the fixed plate and run through the slip chamber of fixed plate, the movable plate upper end runs through the slip chamber, the fixed plate up end still is fixed with two and is located respectively the gag lever post of both sides around the slip chamber, the gag lever post with ejecting piece contact, the gag lever post left end is close to the slip chamber just the gag lever post right-hand member is kept away from the slip chamber.

Furthermore, the moving mechanism also comprises a transmission shaft with the front end and the rear end respectively connected with the front end wall and the rear end wall of the transmission cavity in a rotating way, a transmission gear with the upper end in contact with the lower end surface of the second connecting rod is fixed on the transmission shaft, a baffle plate positioned on the right side of the transmission gear is also fixed at the right end of the second connecting rod, a spring plate in contact with the left end of the rack rod and a telescopic spring for connecting the spring plate and the left end wall of the moving cavity are also arranged in the moving cavity, a lifting cavity with an upward opening is arranged in the supporting block, a lifting block with the upper end positioned in an external space and a lifting spring for connecting the lifting block and the lower end wall of the lifting cavity are arranged in the lifting cavity, a first magnet is fixed on the lower end wall of the lifting cavity, a second magnet which is repellent to the first magnet is fixed on the lower end of the lifting block, and a warning board is fixed on the upper end of the lifting block, the lift chamber is close to one side end wall of motor is equipped with the intercommunication the spring chamber in lift chamber, the spring intracavity is equipped with one end and is located just simultaneously in the lift chamber first magnet with iron plate between the second magnet, the spring intracavity still is equipped with the connection the iron plate with the coupling spring of spring chamber end wall, the iron plate is close to the one end of motor is fixed with the chain, and the left side the chain runs through remove chamber left end wall and with spring board fixed connection, right side the chain runs through transmission chamber right side end wall just fixes on the transmission shaft.

Further, the driven mechanism includes the driven plate and connects the driven plate with the driven spring of driven chamber right-hand member wall, the driven plate left end face is fixed with the third connecting rod, the third connecting rod left end be fixed with the lower extreme with the rotation axis of fixed plate right-hand member rotation connection, the rotation axis lower extreme still be fixed with through the belt with the second belt pulley of first belt pulley connection.

Furthermore, the rolling mechanism comprises a rotating cavity communicated with the external space, a circular cavity with a downward opening is arranged in the lower end wall of the rotating cavity, a cylindrical block is arranged in the circular cavity, two support rods with the lower ends positioned in the external space are fixed at the lower ends of the cylindrical block, the two support rods are connected through a rolling shaft, the rolling shaft is fixed with a roller, the upper side of the cylindrical block is provided with a circular plate, the circular plate is connected with the cylindrical block through a lifting spring, the lower end surface of the circular plate is also fixedly provided with two friction plates, the lower ends of the two friction plates penetrate through the cylindrical block and are positioned in the external space, the lower ends of the two friction plates are respectively positioned at the left side and the right side of the roller, a lower pressing rod with the lower end penetrating through the lower end wall of the rotating cavity and contacting with the upper end of the circular plate is arranged in the rotating cavity, the upper end of the lower pressing rod is fixed with a poking rod, and a limiting cavity with a forward opening and communicated with the external space is arranged in the rear end wall of the rotating cavity.

Further, under the initial condition, the belt is in loose state, can not realize the transmission between first belt pulley with the second belt pulley, after ejecting spring reset ejecting piece, can make ejecting piece with the belt contact, and make the belt tensioning.

Further, in an initial state, the ejection spring, the support spring, the extension spring, the lifting spring and the driven spring are all in a compressed state, and the connecting spring and the lifting spring are in a normal stretching state.

Further, when the area of contact between the friction plate and the roller is increased, the friction plate can restrict the rotation of the roller.

Further, the upper end of the first magnet and the lower end of the second magnet repel each other.

The invention has the beneficial effects that: the device simple structure, the simple operation, the device can be divided into two as required at the during operation, makes the warning sign face two directions, for more vehicles or pedestrian provide warning information, and the device is when not needing the during operation, and the mode mobile device that the accessible promoted is convenient for shift the collection.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of A-A of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1 according to an embodiment of the present invention;

fig. 4 is an enlarged schematic view of the structure at C in fig. 1 according to the embodiment of the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The warning device for road engineering construction described with reference to fig. 1-4 includes two supporting blocks 28, a driving cavity 12 with a right opening is provided in the supporting block 28 on the left side, a driven cavity 33 with a left opening is provided in the supporting block 28 on the right side, a driving mechanism 68 for driving the driving device to operate is provided in the driving cavity 12, a moving cavity 40 with a right end wall communicating with the external space is provided in the lower end wall of the driving cavity 12, a moving mechanism 67 for controlling the supporting block 28 on the right side to move left and right is provided in the moving cavity 40, the upper end wall of the moving cavity 40 communicates with the driving cavity 12, the moving mechanism 67 includes a moving plate 35 with an upper end located in the driving cavity 12, a first connecting rod 18 is fixed on the lower end surface of the moving plate 35, a rotating shaft 19 is rotatably connected to the right end of the first connecting rod 18, a transmission cavity 52 is provided in the lower end wall of the driven cavity 33, the upper end of the rotating shaft 19 is fixed with a second connecting rod 20, the right end of the second connecting rod is located in the transmission cavity 52, the lower end of the moving plate 35 is provided with a lifting cavity 44 with a left opening, the lifting cavity 44 is internally provided with a spring block 42 and a supporting spring 43 for supporting the spring block 42, the left end face of the spring block 42 is fixed with a rack rod 16, the left end of the rack rod is located in the moving cavity 40, the upper end of the moving plate 35 is further provided with two ejection cavities 46 communicated with the driving cavity 12, the ejection cavity 46 is internally provided with an ejection block 36 with one end located in the driving cavity 12 and an ejection spring 47 for connecting the ejection block 36 with the end wall of the ejection cavity 46, the end wall of the ejection cavity 46 close to the center of the moving plate 35 is fixed with an electromagnet 48 capable of sucking the ejection block 36, the lifting cavity 44 is further provided with a lower pressing block 41 with the lower end in contact with the spring block 42, and the upper end of the lower pressing block 41 is fixed with two upper ends respectively penetrating through the end walls of the ejection cavities 46 and in contact with the ejection cavity 46 The rope 45 is fixedly connected with the outlet block 36, a driven mechanism 69 which can be driven by the driving mechanism 68 to work so as to control the movement of the supporting block 28 on the right side is arranged in the driven cavity 33, two rolling mechanisms 66 which provide support for the supporting block 28 are also arranged in the supporting block 28, the driving mechanism 68 works to drive the moving mechanism 67 to work so as to separate the left supporting block 28 from the right supporting block 28, and then the driving mechanism 68 works to control the driven mechanism 69 to work so as to move the supporting block 28 on the right side and change the orientation of the supporting block 28 on the right side.

Advantageously, the driving mechanism 68 comprises a motor 11, the left end wall of the driving chamber 12 is fixed with a fixing plate 39 whose right end is located in the driven chamber 33, a driving shaft 34 with a lower end penetrating through the fixing plate 39 and the upper end wall of the moving cavity 40 and positioned in the moving cavity 40 is dynamically connected to the lower end of the motor 11, a first belt pulley 13 is fixed at the upper end of the driving shaft 34 and a driving gear 17 is fixed at the lower end of the driving shaft 34, the rack bar 16 is engaged with the rear end of the driving gear 17, a sliding cavity 70 penetrating through the fixing plate 39 is arranged in the fixing plate 39, the upper end of the moving plate 35 penetrates through the sliding cavity 70, two limit rods 38 respectively positioned at the front side and the rear side of the sliding cavity 70 are fixed on the upper end surface of the fixed plate 39, the limiting rod 38 is in contact with the ejection block 36, the left end of the limiting rod 38 is close to the sliding cavity 70, and the right end of the limiting rod 38 is far away from the sliding cavity 70.

Advantageously, the moving mechanism 67 further comprises a transmission shaft 49 with front and rear ends rotatably connected to the front and rear end walls of the transmission chamber 52, respectively, a transmission gear 50 with an upper end in contact with the lower end surface of the second connecting rod 20 is fixed on the transmission shaft 49, a baffle 51 positioned at the right side of the transmission gear 50 is fixed at the right end of the second connecting rod 20, a spring plate 15 in contact with the left end of the rack bar 16 and a telescopic spring 14 connecting the spring plate 15 and the left end wall of the moving chamber 40 are further arranged in the moving chamber 40, a lifting chamber 27 with an upward opening is arranged in the supporting block 28, a lifting block 30 with an upper end in an external space and a lifting spring 26 connecting the lifting block 30 and the lower end wall of the lifting chamber 27 are arranged in the lifting chamber 27, a first magnet 24 is fixed on the lower end wall of the lifting chamber 27, a second magnet 25 repulsive to the first magnet 24 is fixed on the lower end of the lifting block 30, the warning sign 10 is fixed with to elevator 30 upper end, lift chamber 27 is close to one side end wall of motor 11 is equipped with the intercommunication lift chamber 27's spring chamber 71, it is located to be equipped with one end in the spring chamber 71 lift chamber 27 just is located simultaneously first magnet 24 with iron plate 23 between the second magnet 25, still be equipped with the connection in the spring chamber 71 iron plate 23 with the coupling spring 72 of spring chamber 71 end wall, iron plate 23 is close to the one end of motor 11 is fixed with chain 53, and the left side chain 53 runs through remove chamber 40 left end wall and with spring plate 15 fixed connection, the right side chain 53 runs through transmission chamber 52 right-hand member wall just fixes on the transmission shaft 49.

Advantageously, the driven mechanism 69 comprises a driven plate 31 and a driven spring 29 connecting the driven plate 31 and the right end wall of the driven cavity 33, a third connecting rod 32 is fixed on the left end surface of the driven plate 31, a rotating shaft 21 with the lower end rotatably connected with the right end of the fixed plate 39 is fixed on the left end of the third connecting rod 32, and a second pulley 22 connected with the first pulley 13 through the belt 37 is further fixed on the lower end of the rotating shaft 21.

Advantageously, the rolling mechanism 66 comprises a rotating cavity 57 communicated with the external space, a circular cavity 59 with a downward opening is arranged in the lower end wall of the rotating cavity 57, a cylindrical block 61 is arranged in the circular cavity 59, two support rods 63 with lower ends located in the external space are fixed at the lower ends of the cylindrical block 61, the two support rods 63 are connected through a rolling shaft 64, a roller 65 is fixed on the rolling shaft 64, a circular plate 58 is arranged on the upper side of the cylindrical block 61, the circular plate 58 is connected with the cylindrical block 61 through a lifting spring 60, two friction plates 62 with lower ends penetrating through the cylindrical block 61 and located in the external space are further fixed on the lower end surface of the circular plate 58, the lower ends of the two friction plates 62 are respectively located on the left side and the right side of the roller 65, a lower pressing rod 54 with a lower end penetrating through the lower end wall of the rotating cavity 57 and contacting with the upper end of the circular plate 58 is arranged in the rotating cavity 57, a poke rod 55 is fixed at the upper end of the lower pressure rod 54, and a limit cavity 56 with a forward opening and communicated with the external space is arranged in the rear end wall of the rotating cavity 57.

Advantageously, in the initial condition, the belt 37 is in a loose condition, no transmission is possible between the first pulley 13 and the second pulley 22, and after the ejection spring 47 has returned to eject the ejection block 36, the ejection block 36 can be brought into contact with the belt 37 and the belt 37 can be tensioned.

Advantageously, in the initial state, the ejection spring 47, the support spring 43, the extension spring 14, the lifting spring 26 and the follower spring 29 are all in a compressed state, and the connecting spring 72 and the lifting spring 60 are in a normal tension state.

Advantageously, the friction plate 62 limits the rotation of the roller 65 when the area of contact between the friction plate 62 and the roller 65 increases.

Advantageously, the upper end of the first magnet 24 is repelled from the lower end of the second magnet 25.

Sequence of mechanical actions of the whole device:

1: the poke rod 55 is manually pressed to drive the lower pressing rod 54 to descend, so that the circular plate 58 descends, the lifting spring 60 is compressed, the circular plate 58 descends to enable the friction plates 62 to descend, so that the two friction plates 62 are positioned on the left side and the right side of the roller 65, the contact area between the friction plates 62 and the roller 65 is increased, so that the rotation of the roller 65 is limited, at the moment, the poke rod 55 is rotated to enable the poke rod 55 to be positioned in the limiting cavity 56, so that the lifting spring 60 is limited to reset, when the reset is needed, the poke rod 55 is manually rotated to enable the poke rod 55 to leave the limiting cavity 56, the lifting spring 60 resets to drive the circular plate 58 to move upwards, so that the poke rod 55 and the lower pressing rod 54 move upwards to reset, so that the friction plates 62 move upwards, so that the friction plates 62 are separated from the roller 65, and the roller 65 can rotate;

2: when the orientation of the right warning sign 10 is different from the orientation of the left warning sign 10, the rolling mechanism 66 in the supporting block 28 on the left side is manually controlled to work, so that the roller 65 on the left side cannot rotate, the motor 11 works to drive the driving shaft 34 to rotate, so as to drive the first belt pulley 13 and the driving gear 17 to rotate, the driving gear 17 rotates to drive the rack bar 16 to move rightwards, so as to drive the moving plate 35 to move rightwards, so as to drive the first connecting rod 18 and the rotating shaft 19 to move rightwards, so as to drive the second connecting rod 20 and the baffle 51 to move rightwards, the second connecting rod 20 moves rightwards to drive the driving gear 50 to rotate, so as to drive the driving shaft 49 to rotate and wind up the right-side chain 53, so as to return the right-side iron block 23 to the right-side connecting spring 72, so as to directly repel the first magnet 24 on the right side and the second magnet 25 on the right side, so as to move the rack bar 16 to move rightwards, so as to restore the expansion spring 14 to drive the spring plate 15 to move rightwards, thereby driving the left side chain 53 to move rightwards, so that the left side iron block 23 returns to the left side connecting spring 72, so that the first magnet 24 on the left side and the second magnet 25 on the left side directly repel each other, and the lifting block 30 moves upwards due to the repulsion of the first magnet 24 and the second magnet 25, so that the warning board 10 moves upwards, and the lifting spring 26 resets;

3: the second connecting rod 20 moves rightwards with the baffle 51 to contact with the right end wall of the transmission cavity 52, so as to drive the right side supporting block 28 to move rightwards, so that the left side supporting block 28 and the right side supporting block 28 are far away from each other, when the rotating shaft 19 moves rightwards and is positioned in the external space and the rotating shaft 19 and the rotating shaft 21 are positioned on the same vertical line, the moving plate 35 moves rightwards and contacts with the right end wall of the sliding cavity 70, in the process that the moving plate 35 moves rightwards, due to the limiting rod 38, the ejecting spring 47 is gradually reset to drive the ejecting block 36 to gradually leave the ejecting cavity 46, when the moving plate 35 moves rightmost, the ejecting block 36 contacts with the belt 37 and tensions the belt 37, the movement of the ejecting block 36 pulls the rope 45, so as to drive the lower pressing block 41 to move upwards, the supporting spring 43 drives the resetting spring block 42 to move upwards, so as to drive the rack rod 16 to move upwards, and when the ejecting block 36 stops driving the lower pressing block 41 to move upwards, the rack bar 16 is just separated from the driving gear 17, at this time, the motor 11 works to drive the driving shaft 34 to rotate, so as to drive the first belt pulley 13 and the driving gear 17 to rotate, the first belt pulley 13 rotates to drive the second east belt pulley 22 to rotate through the transmission of the chain 53, so as to drive the rotating shaft 21 and the third connecting rod 32 to rotate, so as to drive the driven plate 31 and the right supporting block 28 to rotate and move, so that the right warning board 10 rotates and moves, and therefore the warning board 10 faces different positions;

4: when the device needs to be reset, the driving shaft 34 is operated to drive the driving shaft 34 to rotate reversely, so that the driving gear 17 and the first belt pulley 13 rotate reversely, the first belt pulley 13 rotates to drive the second belt pulley 22 to rotate reversely through the chain 53, so that the rotating shaft 21 and the third connecting rod 32 are reset, so that the driven plate 31 and the right supporting block 28 are reset, so that the right warning board 10 is reset, then the electromagnet 48 operates to attract the ejection block 36, so that the ejection block 36 returns to the ejection cavity 46, so that the belt 37 is loosened again, the rope 45 is loosened during resetting of the ejection block 36, so that the lower pressing block 41 descends under the action of self weight, so that the spring block 42 descends, so that the rack bar 16 descends to be meshed with the driving gear 17 again, the supporting spring 43 is compressed, the driving gear 17 rotates reversely to drive the rack bar 16 to move leftwards, so that the moving plate 35, the first connecting rod 18, the second connecting rod 18, and the third connecting rod 28 move leftwards, The rotating shaft 19, the second connecting rod 20 and the baffle 51 move leftwards, the second connecting rod 20 moves leftwards to drive the transmission gear 50 and the transmission shaft 49 to rotate, so that the right-side chain 53 is loosened, the right-side connecting spring 72 is reset to drive the right end of the right-side iron block 23 to reset to be positioned on the upper side of the right-side first magnet 24, at the moment, the right-side first magnet 24 and the second magnet 25 are not repelled, so that the warning board 10 and the lifting block 30 on the right side descend and reset under the action of dead weight, the right-side lifting spring 26 is compressed, when the baffle 51 moves leftwards to be in contact with the transmission gear 50, the baffle 51 continues to be driven leftwards to move, so that the transmission gear 50 and the transmission shaft 49 are driven to move leftwards to reset, the right-side supporting block 28 is driven to move leftwards, when the rack bar 16 moves leftwards to reset, the spring plate 15 is driven to move leftwards to reset, the left-side chain 53 is loosened, and the telescopic spring 14 is compressed, because the left side chain 53 loosens to make left side connecting spring 72 reset and drive left side iron plate 23 left end and reset and lie in left side first magnet 24 upside again, left first magnet 24 and second magnet 25 are no longer repulsive at this moment, thereby make left warning sign 10 and elevator 30 descend under the effect of dead weight and reset, left side lift spring 26 is compressed, and the device is accomplished and is reset.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a warning device for road engineering construction, includes two supporting shoes, its characterized in that: a driving cavity with a right opening is formed in the supporting block on the left side, a driven cavity with a left opening is formed in the supporting block on the right side, a driving mechanism for driving the driving device to operate is arranged in the driving cavity, and a moving cavity with a right end wall communicated with an external space is formed in the lower end wall of the driving cavity; a moving mechanism for controlling the supporting block on the right side to move left and right is arranged in the moving cavity, the upper end wall of the moving cavity is communicated with the driving cavity, the moving mechanism comprises a moving plate, the upper end of the moving plate is positioned in the driving cavity, a first connecting rod is fixed on the right end face of the lower end of the moving plate, the right end of the first connecting rod is rotatably connected with a rotating shaft, a transmission cavity is arranged in the lower end wall of the driven cavity, a second connecting rod, the right end of the second connecting rod is positioned in the transmission cavity, a lifting cavity with a leftward opening is arranged in the lower end of the moving plate, a spring block and a supporting spring for supporting the spring block are arranged in the lifting cavity, a rack rod with the left end positioned in the moving cavity is fixed on the left end face of the spring block, two ejection cavities communicated with the driving cavity are also arranged in the upper end of the moving plate, an ejection block with one end positioned in the driving cavity and an ejection spring for connecting the ejection block with the end wall of the ejection cavity are arranged in the ejection cavity, an electromagnet capable of being attracted towards the ejection block is fixed on the end wall of the ejection cavity close to the center of the moving plate, a lower pressing block with the lower end contacting with the spring block is further arranged in the lifting cavity, and two ropes with upper ends respectively penetrating through the end walls of the two ejection cavities and fixedly connected with the ejection blocks are fixed at the upper ends of the lower pressing blocks; the driven cavity is internally provided with a driven mechanism which can be driven by the driving mechanism to work so as to control the support block on the right side to move, two rolling mechanisms which provide support for the support blocks are also arranged in the support blocks, the driving mechanism works to drive the moving mechanism to work so as to separate the left support block from the right support block, and then the driving mechanism works to control the driven mechanism to work so as to move the support block on the right side and change the orientation of the support block on the right side; the driving mechanism comprises a motor, a fixed plate with the right end located in the driven cavity is fixed on the left end wall of the driving cavity, the lower end of the motor is in power connection with a driving shaft with the lower end penetrating through the fixed plate and the upper end wall of the moving cavity and located in the moving cavity, a first belt pulley is fixed at the upper end of the driving shaft, a driving gear is fixed at the lower end of the driving shaft, the rack rod is meshed with the rear end of the driving gear, a sliding cavity penetrating through the fixed plate is arranged in the fixed plate, the upper end of the moving plate penetrates through the sliding cavity, two limiting rods respectively located on the front side and the rear side of the sliding cavity are further fixed on the upper end surface of the fixed plate, the limiting rods are in contact with the ejection block, the left end of the limiting rod is close to the sliding cavity, and the right end of the limiting rod is far away from the sliding cavity; the moving mechanism further comprises a transmission shaft, the front end wall and the rear end wall of the transmission chamber are respectively connected with the front end wall and the rear end wall of the transmission chamber in a rotating mode, a transmission gear with the upper end in contact with the lower end face of the second connecting rod is fixed on the transmission shaft, a baffle plate positioned on the right side of the transmission gear is further fixed on the right end of the second connecting rod, a spring plate in contact with the left end of the rack rod and a telescopic spring for connecting the spring plate with the left end wall of the moving chamber are further arranged in the moving chamber, a lifting chamber with an upward opening is arranged in the supporting block, a lifting block with the upper end positioned in an external space and a lifting spring for connecting the lifting block with the lower end wall of the lifting chamber are arranged in the lifting chamber, a first magnet is fixed on the lower end wall of the lifting chamber, a second magnet which is repellent to the first magnet is fixed on the lower end of the lifting block, a warning board is fixed on the upper end of the lifting chamber, and a spring chamber which is close to one side of the motor is provided with a spring chamber communicated with the lifting chamber, an iron block with one end positioned in the lifting cavity and positioned between the first magnet and the second magnet is arranged in the spring cavity, a connecting spring for connecting the iron block and the end wall of the spring cavity is further arranged in the spring cavity, a chain is fixed at one end, close to the motor, of the iron block, the chain on the left side penetrates through the left end wall of the moving cavity and is fixedly connected with the spring plate, and the chain on the right side penetrates through the right end wall of the transmission cavity and is fixed on the transmission shaft; the driven mechanism comprises a driven plate and a driven spring which is connected with the driven plate and the right end wall of the driven cavity, a third connecting rod is fixed on the left end face of the driven plate, a rotating shaft with the lower end rotatably connected with the right end of the fixed plate is fixed on the left end of the third connecting rod, and a second belt pulley connected with the first belt pulley through a belt is further fixed on the lower end of the rotating shaft; the rolling mechanism comprises a rotating cavity communicated with the external space, a circular cavity with a downward opening is arranged in the lower end wall of the rotating cavity, a cylindrical block is arranged in the circular cavity, two support rods with the lower ends positioned in the external space are fixed at the lower ends of the cylindrical block, the two support rods are connected through a rolling shaft, the rolling shaft is fixed with a roller, the upper side of the cylindrical block is provided with a circular plate, the circular plate is connected with the cylindrical block through a lifting spring, the lower end surface of the circular plate is also fixedly provided with two friction plates, the lower ends of the two friction plates penetrate through the cylindrical block and are positioned in the external space, the lower ends of the two friction plates are respectively positioned at the left side and the right side of the roller, a lower pressing rod with the lower end penetrating through the lower end wall of the rotating cavity and contacting with the upper end of the circular plate is arranged in the rotating cavity, a poke rod is fixed at the upper end of the lower pressing rod, and a limiting cavity with a forward opening and communicated with the external space is arranged in the rear end wall of the rotating cavity; in an initial state, the belt is in a loose state, transmission cannot be realized between the first belt pulley and the second belt pulley, and after the ejection spring is reset to eject the ejection block, the ejection block can be in contact with the belt, and the belt is tensioned; in an initial state, the ejection spring, the support spring, the extension spring, the lifting spring and the driven spring are all in a compressed state, and the connecting spring and the lifting spring are in a normal stretching state; when the contact area between the friction plate and the roller is increased, the friction plate can limit the rotation of the roller; the upper end of the first magnet and the lower end of the second magnet repel each other.