CN111292657A

CN111292657A - Billboard used on roof of taxi

Info

Publication number: CN111292657A
Application number: CN202010252476.XA
Authority: CN
Inventors: 彭嵩; 侯美芳; 项炳海
Original assignee: Individual
Current assignee: Shenzhen Zhongyuan Culture Media Co ltd
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2020-06-16
Anticipated expiration: 2038-09-20
Also published as: CN111292657B; CN109064950B; CN109064950A; CN111261065B; CN111261065A

Abstract

The invention belongs to the technical field of advertising boards, and particularly relates to an advertising board used on the roof of a taxi, which comprises a base, a triangular advertising board, an adjusting mechanism, a wind energy mechanism and the like, wherein the triangular advertising board can stop rotating and switching when the taxi runs at a high speed, and intermittently rotate and switch when the taxi runs at a low speed, so that the triangular advertising board can effectively propagate three-sided advertisements. The design that the friction wheel moves towards the front cone end of the first cone-shaped friction wheel enables the rotation switching speed of the triangular advertising board to be kept unchanged as much as possible when a taxi runs at different low speeds, and the advertising effect of the triangular advertising board is improved. In addition, the rotating adjusting ring is used for pushing the pushed ring, so that the compression amount of the first spring is increased, the time that the triangular shifting rod sequentially crosses the limiting block is longer and longer, the driving cylinder drives the triangular advertising board to rotate and switch, and the advertising effect of the triangular advertising board under different conditions is met.

Description

Billboard used on roof of taxi

Technical Field

The invention belongs to the technical field of advertising boards, and particularly relates to an advertising board used on the roof of a taxi.

Background

At present, a billboard used on the roof of a taxi is a traditional fixed billboard with a non-LED screen. For the traditional fixed type non-LED screen billboard, the advertisement propaganda needs to be carried out by advertisement words posted on the billboard, and the advertisement words can only propagate two sides of the billboard at most, so that the advertisement effect of the traditional fixed type non-LED screen billboard is much worse than that of the fixed type LED billboard on the market; but the traditional fixed non-LED screen billboard also has certain advantages: it can not be used for advertising because of the failure of the LED advertising screen. In order to effectively expand the advertising effect of the conventional fixed non-LED panel billboard, a rotary conventional fixed non-LED panel billboard needs to be designed to increase the number of the slogans of the conventional fixed non-LED panel billboard and to switch them uninterruptedly, thereby making up for the problem of poor advertising effect.

The invention designs a billboard used on the roof of a taxi to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a billboard used on the roof of a taxi, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "below", "upper" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention usually place when using, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A billboard used on the roof of a taxi is characterized in that: the solar energy advertising board comprises a base, a first supporting plate, a fixed rod, a triangular advertising board, an adjusting mechanism and a wind energy mechanism, wherein the first supporting plate is fixedly arranged on the upper surface of one end of the base; one end of the fixed rod is arranged in the round hole of the first supporting plate through a bearing, and the other end of the fixed rod is fixedly provided with a triangular billboard; the adjusting mechanism and the wind energy mechanism are both arranged on the upper surface of the base, and the adjusting mechanism is positioned between the wind energy mechanism and the triangular billboard; one end of the adjusting mechanism is connected with the wind energy mechanism, and the other end of the adjusting mechanism is connected with the triangular billboard.

The wind energy mechanism comprises blades, a fifth supporting plate, a sixth supporting plate, a seventh supporting plate, an eighth supporting plate, a connecting rod, a first ring sleeve, a fixed shaft, a first centrifugal wheel, a second rotating shaft, a third gear, a second centrifugal wheel, a connecting strip, a second ring sleeve, a friction wheel, a telescopic rod, a second gear, a first conical friction wheel, a second conical friction wheel, a third rotating shaft, a fourth gear, a centrifugal block, a first centrifugal spring, a first centrifugal chute, a centrifugal plate, a second centrifugal spring, a U-shaped plate, a U-shaped through groove and a second centrifugal chute, wherein the fifth supporting plate, the sixth supporting plate, the seventh supporting plate and the eighth supporting plate are all arranged on the upper surface of the base, and the fifth supporting plate is positioned at one end of the base; the sixth supporting plate and the seventh supporting plate are positioned between the fifth supporting plate and the eighth supporting plate; the sixth supporting plate is positioned between the seventh supporting plate and the fifth supporting plate; one end of the fixed shaft is arranged on the fifth supporting plate, and the other end of the fixed shaft is nested with the first ring sleeve; a plurality of blades are uniformly arranged on the outer circular surface of the first ring sleeve along the circumferential direction; the second rotating shaft is arranged in a circular hole of the sixth supporting plate through a bearing, and two ends of the second rotating shaft penetrate through the sixth supporting plate; one end of the second rotating shaft is nested with the first centrifugal wheel, and the other end of the second rotating shaft is fixedly provided with the second centrifugal wheel; the third gear is arranged on the second rotating shaft and is positioned between the second centrifugal wheel and the sixth supporting plate; one ends of the three connecting rods are respectively and fixedly arranged on the side surface of the first ring sleeve far away from the fifth supporting plate, and the other ends of the three connecting rods are respectively and fixedly arranged on the side surface of the first centrifugal wheel far away from the sixth supporting plate; the three connecting rods are uniformly distributed along the circumferential direction; the inner circular surface of the first centrifugal wheel is uniformly provided with three first centrifugal chutes along the circumferential direction; the three centrifugal blocks are respectively arranged in the three first centrifugal chutes in a sliding fit manner; one end of each of the three first centrifugal springs is respectively arranged on the three centrifugal blocks, and the other end of each of the three first centrifugal springs is respectively arranged on the bottom groove surfaces of the three first centrifugal chutes; the three first centrifugal springs are respectively positioned in the three first centrifugal chutes; the three centrifugal blocks are respectively matched with the second rotating shaft; two second centrifugal chutes are symmetrically arranged on the outer circular surface of the second centrifugal wheel; the two centrifugal plates are respectively arranged in the two second centrifugal chutes in a sliding fit manner; one end of each of the two second centrifugal springs is mounted on the two centrifugal plates, and the other end of each of the two second centrifugal springs is mounted on the bottom groove surfaces of the two second centrifugal chutes; the two second centrifugal springs are respectively positioned in the two second centrifugal chutes; one end of each centrifugal plate, which is far away from the second centrifugal spring, is provided with a U-shaped through groove; two U-shaped plates are symmetrically arranged on the outer circular surface of the second ring sleeve; one ends of the two connecting strips are respectively arranged in the U-shaped through grooves of the two centrifugal plates through pins, and the other ends of the two connecting strips are respectively arranged in the two U-shaped plates through pins; the telescopic rod consists of a telescopic inner rod and a telescopic outer sleeve; the telescopic outer sleeve is arranged in a round hole of the eighth supporting plate through a bearing, and two ends of the telescopic outer sleeve penetrate through the eighth supporting plate; a second gear is fixedly arranged at one end of the telescopic outer sleeve far away from the telescopic inner rod; one end of the telescopic inner rod, which is far away from the telescopic outer sleeve, is arranged in the second ring sleeve through a bearing; the friction wheel is arranged on the telescopic inner rod and is positioned between the telescopic outer sleeve and the second ring sleeve; the third rotating shaft is arranged in a round hole of the seventh supporting plate through a bearing, and two ends of the third rotating shaft penetrate through the seventh supporting plate; one end of the third rotating shaft is fixedly provided with a fourth gear, and the other end of the third rotating shaft is fixedly provided with a second conical friction wheel; the fourth gear is positioned between the seventh supporting plate and the sixth supporting plate; the fourth gear is meshed with the third gear; the second conical friction wheel is positioned between the seventh supporting plate and the eighth supporting plate; the first conical friction wheel is arranged on the eighth supporting plate through a shaft and is positioned between the friction wheel and the second conical friction wheel; the first conical friction wheel is in friction fit with the second conical friction wheel and the friction wheel respectively.

The adjusting mechanism comprises a driving cylinder, a one-way clutch ring, a support ring, a fixed ring sleeve, an adjusting ring, a first gear, a first rotating shaft, a fourth support plate, a third support plate, a second support plate, a volute spring, a triangular deflector rod, a limiting block, a guide groove, a first spring, a pushed ring, a limiting chute, an annular groove and an inclined plane, wherein the second support plate, the third support plate and the fourth support plate are fixedly arranged on the upper surface of the base, and the third support plate is positioned between the second support plate and the fourth support plate; the fourth supporting plate is close to an eighth supporting plate in the wind energy mechanism, and the second supporting plate is close to the triangular billboard; a support ring is fixedly arranged at one end of the second support plate far away from the base; a unidirectional clutch ring is arranged on the outer circular surface of the driving cylinder; the driving cylinder is arranged in the supporting ring through a one-way clutch ring; both ends of the driving cylinder penetrate out of the supporting rings; one end of the driving cylinder is connected with the side surface of the triangular billboard, and a triangular deflector rod is fixedly arranged on the outer circular surface of the other end; a fixed ring sleeve is fixedly arranged at one end of the third supporting plate far away from the base; the fixed ring sleeve is nested on the outer circular surface of the driving cylinder and is positioned between the support ring and the triangular deflector rod; the outer circle surface of the middle position of the fixed ring sleeve is provided with a ring groove; the inner circular surface of the ring groove is provided with an external thread; the adjusting ring is nested in the ring groove; the inner circular surface of the adjusting ring is provided with an internal thread; the internal thread on the adjusting ring is in threaded fit with the external thread on the ring groove; the pushed ring is nested in the ring groove; the side surface of the fixed ring sleeve close to the triangular shifting rod is uniformly provided with three limiting sliding grooves along the circumferential direction; the three limiting sliding chutes are communicated with the ring groove; two guide grooves are symmetrically formed in two sides of each limiting sliding groove; the pushed ring is positioned between the adjusting ring and the limiting sliding groove; the side surface of the pushed ring is in contact with the side surface of the adjusting ring.

The structure of each limiting chute in the fixed ring sleeve is the same, and for any one limiting chute, a limiting block is arranged in the limiting chute in a sliding fit manner; one end of the first spring is arranged on the limiting block, and the other end of the first spring is arranged on the side surface of the pushed ring; two guide blocks are symmetrically arranged on two side surfaces of one end, connected with the first spring, of the limiting block; the two guide blocks are respectively arranged in the guide grooves at two sides of the limiting sliding chute in a sliding fit manner; one end of the limiting block, which is far away from the first spring, is provided with an inclined plane; the inclined plane on the limiting block is matched with the triangular shifting rod.

The first rotating shaft, the first gear and the volute spiral spring in the adjusting mechanism are arranged as follows: the first rotating shaft is arranged in a round hole of the fourth supporting plate through a bearing, and two ends of the first rotating shaft penetrate through the fourth supporting plate; one end of the first rotating shaft is fixedly provided with a first gear, and the other end of the first rotating shaft is inserted into the driving cylinder; one end of the spiral spring is arranged on the outer circular surface of one end of the first rotating shaft far away from the first gear, and the other end of the spiral spring is arranged on the inner circular surface of the driving cylinder.

The second gear is meshed with the first gear.

A generatrix of the first conical friction wheel in frictional contact with the friction wheel is parallel to the axis of the telescopic inner rod; the first conical friction wheel is provided with a front conical end and a rear conical end, and the diameter of the front conical end is smaller than that of the rear conical end; the front cone end of the first cone-shaped friction wheel is close to the second ring sleeve.

As a further improvement of the technology, the air conditioner also comprises a protective shell and an air inlet square groove, wherein the protective shell is arranged on the upper surface of the base; the wind energy mechanism and the adjusting mechanism are both positioned in the protective shell; an air inlet square groove is formed in the protective shell, and corresponding blades in the wind energy mechanism penetrate out of the air inlet square groove. The blades penetrate through the air inlet square groove, the blades at the upper end of the first ring sleeve can be blown by external wind, the blades at the lower end of the first ring sleeve cannot be blown by the external wind under the shielding of the protective shell, and therefore the blades on the first ring sleeve can be smoothly blown by the external wind to rotate, and the blades drive the first ring sleeve to rotate.

As a further improvement of the present technology, the above-mentioned billboard is equipped with a lighting system. The design is convenient for the taxi to pass through the lighting system at night, so that the pedestrian can still see the advertising words on the triangular billboard.

As a further improvement of the present technology, the first centrifugal spring is a compression spring; the first centrifugal spring is always in a compressed state. The design is that: firstly, when the first centrifugal wheel does not rotate, the centrifugal block tightly presses the second rotating shaft under the action of the first centrifugal spring; secondly, when the first centrifugal wheel rotates slowly, the extrusion force of the centrifugal block on the second rotating shaft can still ensure that the centrifugal block can drive the second rotating shaft to rotate after the pressure of the first centrifugal spring is offset by the centrifugal force generated by the centrifugal block; thirdly, when the first centrifugal wheel rotates rapidly, after the pressure of the first centrifugal spring is offset by the centrifugal force generated by the centrifugal block, the extrusion force of the centrifugal block on the second rotating shaft is insufficient to ensure that the centrifugal block can drive the second rotating shaft to rotate, and further the rotation of the first centrifugal wheel cannot drive the second rotating shaft to rotate through the centrifugal block.

As a further improvement of the present technology, the second centrifugal spring is an extension spring; when the second centrifugal spring is not stretched, one end of the centrifugal plate with the U-shaped through groove is positioned on the outer side of the outer circular surface of the second centrifugal wheel.

As a further improvement of the present technology, the diameter of the third gear is smaller than the diameter of the fourth gear. The design is that when the third gear drives the fourth gear to rotate, the rotating speed of the fourth gear can be obviously slower than that of the third gear, and the speed reduction effect is achieved.

As a further improvement of the technology, the inner circular surface of the pushed ring is a smooth surface; the surface of the pushed ring, which is contacted with the adjusting ring, is coated with lubricating oil. Because the internal thread on the adjustable ring is in thread fit with the external thread on the annular groove, when the adjustable ring is rotationally adjusted by a user, the adjustable ring moves towards the direction of the pushed ring along the axis of the fixed ring sleeve under the action of thread fit, and then the adjustable ring pushes the pushed ring to move towards the direction of the limiting block, so that the first spring is continuously compressed. The surface of the pushed ring, which is in contact with the adjusting ring, is coated with lubricating oil, so that when the adjusting ring pushes the pushed ring in a rotating manner, the adjusting ring cannot drive the pushed ring to rotate, and the first spring is guaranteed to be smoothly compressed. The inner round surface of the pushed ring is smooth so as to ensure that the pushed ring can be pushed smoothly.

As a further improvement of the present technology, the first spring is a compression spring, and the first spring is always in a compressed state.

As a further improvement of the technology, the diameter of the first gear is 18-20 times of that of the second gear. The design is that: in the process of rotation of the second gear, the second gear drives the first gear to rotate at a slower speed so as to ensure that the first gear can be driven to rotate for about one circle after the second gear rotates for a plurality of circles, and the first gear can drive the triangular shifting lever to cross the corresponding limit block through the first rotating shaft, the volute spiral spring and the driving cylinder after a period of time.

The design of a first ring sleeve, a connecting rod, a first centrifugal wheel, a first centrifugal spring, a centrifugal block and a second rotating shaft is as follows: the first ring sleeve drives the first centrifugal wheel to rotate through the connecting rod, and the first centrifugal spring and the centrifugal block rotate along with the first centrifugal wheel; when the first ring sleeve rotates slowly, the first centrifugal wheel can drive the second rotating shaft to rotate through the centrifugal block; when the rotation speed of the first ring sleeve is gradually increased and reaches a certain critical value, the first centrifugal wheel cannot drive the second rotating shaft to rotate through the centrifugal block, and at the moment, the first centrifugal wheel still drives the first centrifugal spring and the centrifugal block to rotate.

The second centrifugal chute, the second centrifugal spring and the centrifugal plate of the invention need to meet the following requirements: when the centrifugal plate extends out of the second centrifugal chute under the centrifugal force in the rotating process of the second centrifugal wheel, the centrifugal plate can not be separated from the second centrifugal chute all the time.

To second pivot, third gear, second centrifugal wheel, centrifugal plate, second centrifugal spring, connecting strip, U template, second ring cover, telescopic link, second gear, first tapered friction pulley, second tapered friction pulley and fourth gear's design lie in: the second rotating shaft drives the third rotating shaft to rotate through the third gear and the fourth gear, the third rotating shaft drives the first conical friction wheel to rotate through the second conical friction wheel, the first conical friction wheel drives the telescopic inner rod to rotate through the friction wheel, and the telescopic inner rod drives the second gear to rotate through the telescopic outer sleeve. The second rotating shaft drives the second annular sleeve to rotate through the second centrifugal wheel, the centrifugal plate, the connecting strip and the U-shaped plate. Because the end of the telescopic inner rod, which is far away from the telescopic outer sleeve, is arranged in the second ring sleeve through the bearing, the rotation of the telescopic inner rod and the rotation of the second ring sleeve cannot be influenced under the action of the bearing. For the second centrifugal wheel, when the second centrifugal wheel does not rotate, the friction wheel is in friction fit with the rear conical end of the first conical friction wheel; when the second centrifugal wheel rotates, the centrifugal plate extends out of the second centrifugal wheel under the action of centrifugal force, the second centrifugal spring is stretched, the centrifugal plate drives the telescopic inner rod to move towards the direction of the second centrifugal wheel through the connecting strip, the U-shaped plate and the second ring sleeve in the process that the centrifugal plate extends out of the second centrifugal wheel, the friction wheel moves along with the telescopic inner rod, and then the friction wheel moves towards the direction of the front cone end of the first cone-shaped friction wheel; when the rotation speed of the second centrifugal wheel is gradually increased, the larger the distance that the second ring sleeve pulls the friction wheel to move towards the second centrifugal wheel through the telescopic inner rod is, the closer the friction wheel and the first conical friction wheel are in friction fit with each other to the front conical end of the first conical friction wheel. That is to say: firstly, when the second centrifugal wheel is not driven by the second rotating shaft to rotate, the friction wheel is in friction fit with the rear cone end of the first cone-shaped friction wheel; secondly, when the second rotating shaft drives the rotating speed of the second centrifugal wheel to gradually increase from zero, the friction wheel moves towards the front cone end direction of the first cone-shaped friction wheel; thirdly, when the second rotating shaft drives the second centrifugal wheel to rotate at the maximum speed, the friction wheel is just in friction fit with the front conical end of the first conical friction wheel.

The design that the generating line of the first conical friction wheel in frictional contact with the friction wheel is parallel to the axis of the telescopic inner rod ensures that the friction wheel can always be in friction fit with the outer conical surface of the first conical friction wheel when the friction wheel moves towards the front conical end of the first conical friction wheel. The design purpose that the friction wheel moves to the front cone end direction of the first cone-shaped friction wheel is as follows: in the process that the rotating speed of the second rotating shaft is gradually increased, after the transmission of each structure, the rotating speed of the first conical friction wheel is also increased, the diameter of the outer conical surface of the friction wheel in friction fit with the first conical friction wheel is reduced, so that the rotating speed of the friction wheel is kept unchanged as much as possible in the process that the rotating speeds of the second rotating shaft and the first conical friction wheel are gradually increased, and finally the rotating speed of the friction wheel driving the first gear through the telescopic rod and the second gear can be kept unchanged as much as possible.

The design of the adjusting ring, the pushed ring, the first spring, the guide block and the limiting block is as follows: because first spring is in compression state all the time, so the guide block can be located the deepest of guide slot under the effect of first spring and stopper to guarantee that the guide block can not break away from the guide slot, and then make the stopper can not break away from spacing spout under the power that resets of first spring. The adjustable ring promotes to be pushed away the ring and removes to the stopper direction, just so can further adjust the volume of being compressed of first spring to make the stopper by the extrusion enter into the strength of spacing spout bigger and bigger.

The invention relates to a design of a first gear, a first rotating shaft, a volute spiral spring, a driving cylinder, a triangular deflector rod, a limiting block and a one-way clutch ring, which comprises the following steps: the first gear drives the driving cylinder to rotate through the first rotating shaft and the volute spiral spring, the triangular deflector rod rotates along with the driving cylinder, and the rotating direction of the driving cylinder is set to be clockwise; the driving cylinder drives the triangular billboard to rotate clockwise; the design purpose of the unidirectional clutch ring is as follows: the driving cylinder is allowed to rotate clockwise, and the driving cylinder is forbidden to rotate anticlockwise, so that the triangular billboard is guaranteed not to rotate anticlockwise.

Inclined plane and triangle driving lever matched with effect on the stopper: firstly, when the first rotating shaft does not rotate and the driving cylinder does not rotate, the volute spiral spring is in a natural state, and the triangular deflector rod is in contact with the inclined plane of a limiting block; secondly, when the first rotating shaft rotates, the first rotating shaft drives the driving cylinder to rotate through the volute spiral spring, and at the moment, because the first spring is compressed, the triangular shifting lever on the driving cylinder is difficult to extrude the limiting block into the limiting sliding groove, so that the triangular shifting lever and the driving cylinder cannot rotate, and the volute spiral spring is compressed to store energy; thirdly, when the volute spiral spring is compressed to a certain amount, the volute spiral spring can completely push the limiting block into the limiting sliding groove by the poking force provided by the driving cylinder to the triangular poking rod, and then the first rotating shaft can cross the limiting block through the volute spiral spring, the driving cylinder and the triangular poking rod; fourthly, after the triangular shifting lever crosses the corresponding limit block, the driving cylinder and the triangular shifting lever can rapidly rotate to the position of the next limit block under the continuous rotation of the second rotating shaft and the reset of the volute spiral spring, and then the triangular shifting lever is contacted and matched with the inclined plane of the limit block again.

According to the invention, the larger the force of the limiting block which is extruded into the limiting sliding groove is, the larger the compression amount of the volute spiral spring needs to be, and finally the first rotating shaft needs more time to rotate and store energy, so that the time that the first rotating shaft sequentially passes through the limiting block through the volute spiral spring, the driving cylinder and the triangular shifting rod is longer and longer, the frequency of the driving cylinder driving the triangular advertising board to rotate and switch is slowed down, and the advertising effect of the triangular advertising board under different conditions is met.

The design of three stopper along circumferential direction for the rotation angle that the driving cylinder crossed behind each stopper through the triangle driving lever is 120 degrees, and then makes the rotation angle that the driving cylinder drove the triangle bill-board set at 120 degrees, satisfies the purpose that the triangle bill-board propagated the trilateral advertisement of triangle bill-board through rotatory switching.

The billboard is arranged on the top of a taxi. When the taxi does not run, the blade does not drive the first ring sleeve to rotate, the first rotating shaft does not rotate, the volute spiral spring is in a natural state, the triangular deflector rod is in contact with the inclined plane of the limiting block, and the advertisement surfaces on the two sides of the triangular billboard are publicized to the outside at the moment. The second centrifugal wheel does not rotate, and the friction wheel is in friction fit with the rear conical end of the first conical friction wheel.

Setting: when a taxi runs, the blades are blown by wind to drive the first ring sleeve to rotate clockwise; when the running speed of the taxi reaches 30km/h, the first centrifugal wheel just can not drive the second rotating shaft to rotate through the centrifugal block.

When the taxi runs at a slow speed, the blades are blown by wind to drive the first ring sleeve to rotate clockwise, the first ring sleeve drives the first centrifugal wheel to rotate clockwise through the connecting rod, the first centrifugal spring and the centrifugal block rotate along with the first centrifugal wheel, and at the moment, the first centrifugal wheel can drive the second rotating shaft to rotate clockwise through the centrifugal block. The second rotating shaft drives the second gear to rotate anticlockwise through the third gear, the fourth gear, the third rotating shaft, the second conical friction wheel, the first conical friction wheel, the friction wheel and the telescopic rod. The second gear drives the first gear to rotate clockwise; first gear drives first pivot clockwise rotation, and first pivot drives the driving barrel rotation through volute spiral spring, and because first spring is compressed this moment, the triangle driving lever on the driving barrel is difficult to extrude the stopper and enter into spacing spout, so triangle driving lever and driving barrel can not rotate, and volute spiral spring is compressed the energy storage. When the volute spiral spring is compressed to a certain amount, the volute spiral spring can completely enable the limiting block to be extruded into the limiting sliding groove through the poking force provided by the driving cylinder to the triangular poking rod, and then the first rotating shaft can cross the limiting block through the volute spiral spring, the driving cylinder and the triangular poking rod. After the limiting block is extruded into the limiting sliding groove and the triangular shifting rod passes over the limiting block, the limiting block moves and resets under the action of the first spring. After the triangle driving lever crosses the corresponding limiting block, the driving cylinder and the triangle driving lever can rapidly rotate to the position of the next limiting block under the continuous rotation of the second rotating shaft and the reset of the volute spiral spring, then the triangle driving lever is contacted and matched with the inclined plane of the limiting block again, and the rotating angle of the driving cylinder is 120 degrees at the moment. Then the driving cylinder drives the triangular billboard to rotate 120 degrees, the triangular billboard drives the fixed rod to rotate, and the triangular billboard is rotated and switched to propagate the advertisement on the other side of the triangular billboard. When the triangular billboard rotates and is switched next time, the process that the triangular deflector rod passes over the limiting block after the scroll spring is compressed to a certain amount is repeated.

When the running speed of the taxi is gradually increased and approaches to 30km/h, the first ring sleeve drives the rotating speed of the second rotating shaft to reach the maximum through the first centrifugal wheel. Due to the design that the friction wheel moves towards the front cone end of the first cone-shaped friction wheel, in the process that the rotating speeds of the second rotating shaft and the first cone-shaped friction wheel are gradually increased, the rotating speed of the friction wheel is kept unchanged as much as possible, the rotating speed of the friction wheel which drives the first gear through the telescopic rod and the second gear can be kept unchanged as much as possible, finally, the speed of the first gear which drives the driving cylinder to rotate in a clearance mode through the first rotating shaft and the volute spiral spring is kept unchanged as much as possible, when the taxi is driven at a speed less than 30km/h, the rotating switching speed of the triangular advertising board is kept unchanged as much as possible, and the advertising effect of the triangular advertising board is improved.

When the running speed of the taxi exceeds 30km/h, the first ring sleeve drives the first centrifugal wheel to rotate clockwise through the connecting rod, but the first centrifugal wheel cannot drive the second rotating shaft to rotate through the centrifugal block, so that the second rotating shaft does not rotate any more, the second rotating shaft does not input power any more, and the triangular billboard does not rotate and is switched. Such a design has the advantages that: when the running speed of the taxi exceeds 30km/h, pedestrians cannot easily see the advertising words of the triangular billboard clearly, the function of rotating and switching the triangular billboard has no better effect, and therefore, after the running speed of the taxi exceeds 30km/h, the triangular billboard stops rotating and switching. In addition, the design that the triangular billboard stops rotating also avoids the action that the triangular billboard still does not stop rotating and switching after the running speed of the taxi exceeds 30km/h, thereby reducing the structural wear of the triangular billboard caused by long-time rotating and switching; the service life of the related structure is prolonged equivalently when the triangular billboard is switched in a rotating way.

After the running speed of the taxi exceeds 30km/h, the second rotating shaft does not rotate any more, the centrifugal plate resets to the original position under the reset action of the second centrifugal spring, and the centrifugal plate drives the friction wheel to move and reset to the original position through the connecting strip, the U-shaped plate, the second ring sleeve and the telescopic inner rod, namely the friction wheel is in friction fit with the rear conical end of the first conical friction wheel.

The one-way clutch ring can limit the counterclockwise rotation of the triangular billboard, and the clockwise rotation of the triangular billboard can pass through the corresponding limit block after the scroll spring stores enough energy; when the external action causes the clockwise rotation triangular billboard to be in, the clockwise rotation switching of the triangular billboard needs enough energy, so that the general external action is not enough to cause the clockwise rotation switching of the triangular billboard, thereby greatly reducing the possibility that the triangular billboard can be freely rotated and switched after being influenced by the external action. When the triangular billboard is switched clockwise, the driving cylinder can completely drive the triangular billboard to rotate 120 degrees quickly under the reset force of the scroll spring, and the reset action of the scroll spring can compensate the error of the triangular billboard during rotation switching, so that the triangular billboard is ensured to rotate 120 degrees every time.

Compared with the traditional billboard technology, the triangular billboard can stop rotating and switching when a taxi runs at a high speed, and intermittently rotate and switch when the taxi runs at a low speed, so that the triangular billboard can effectively propagate three-side advertisements, and the advertising benefit is greatly increased. The design that the friction wheel moves towards the front cone end of the first cone-shaped friction wheel can keep the rotating switching speed of the triangular advertising board unchanged as much as possible when a taxi runs at different low speeds, and the advertising effect of the triangular advertising board is improved. In addition, the driver can promote through rotatory adjustable ring and be pushed away the ring to the compression capacity of increase first spring makes first pivot cross the time of stopper more and more long through spiral spring, drive cylinder and triangle driving lever in proper order, and the frequency that the drive cylinder drove the rotatory switching of triangle bill-board becomes slow, thereby satisfies the advertising effect of triangle bill-board under the different situation. The invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of a billboard.

Fig. 2 is a schematic sectional view of the whole billboard.

Fig. 3 is a schematic view of the blade in cooperation with the protective shell.

Fig. 4 is a schematic view of the adjustment mechanism and the wind energy mechanism installation.

Fig. 5 is an overall schematic view of the adjustment mechanism.

Fig. 6 is an overall sectional front view of the adjustment mechanism.

Fig. 7 is a first gear mounting schematic.

FIG. 8 is a one-way clutch ring installation schematic.

Fig. 9 is a cross-sectional view of a retaining ring.

Fig. 10 is a first spring installation schematic.

Fig. 11 is a schematic view of the triangular shift lever and the stopper.

FIG. 12 is a schematic view of the wind energy mechanism as a whole.

FIG. 13 is a schematic view of blade installation.

FIG. 14 is an installation schematic diagram of a first centrifugal wheel, a second centrifugal wheel, and a first cone-type friction wheel.

FIG. 15 is a schematic cross-sectional front view of the internal structure of the first centrifugal wheel.

FIG. 16 is a schematic view of the centrifugal block and the second shaft.

FIG. 17 is a schematic perspective view of a first centrifugal wheel.

Fig. 18 is a schematic view of the attachment strip installation.

FIG. 19 is a cross-sectional view of the internal structure of a second centrifugal wheel.

FIG. 20 is a perspective schematic view of a second centrifugal wheel.

Number designation in the figures: 1. a base; 2. a first support plate; 3. fixing the rod; 4. a triangular billboard; 5. a protective shell; 6. an air inlet square groove; 7. an adjustment mechanism; 8. a wind energy mechanism; 9. a blade; 10. a fifth support plate; 12. a sixth support plate; 13. a seventh support plate; 14. an eighth support plate; 15. a connecting rod; 16. a first loop; 17. a fixed shaft; 18. a first centrifugal wheel; 19. a second rotating shaft; 20. a third gear; 21. a second centrifugal wheel; 22. a connecting strip; 23. a second loop; 24. a telescopic inner rod; 25. a friction wheel; 26. a telescopic outer sleeve; 27. a telescopic rod; 28. a second gear; 29. a first conical friction wheel; 30. a second tapered friction wheel; 31. a third rotating shaft; 32. a fourth gear; 33. a centrifugal block; 34. a first centrifugal spring; 35. a first centrifugal chute; 36. a centrifugal plate; 37. a second centrifugal spring; 38. a U-shaped plate; 39. a U-shaped through groove; 40. a second centrifugal chute; 42. a drive cylinder; 43. a unidirectional clutch ring; 44. a support ring; 45. fixing the loop; 46. an adjusting ring; 47. a first gear; 48. a first rotating shaft; 49. a fourth support plate; 50. a third support plate; 51. a second support plate; 52. a volute spiral spring; 53. a triangular deflector rod; 54. a limiting block; 55. a guide block; 56. a guide groove; 57. a first spring; 58. a pushed ring; 59. a limiting chute; 60. a ring groove; 61. a bevel.

Detailed Description

As shown in fig. 1, 2 and 4, the wind energy advertising board comprises a base 1, a first supporting plate 2, a fixing rod 3, a triangular advertising board 4, an adjusting mechanism 7 and a wind energy mechanism 8, wherein the first supporting plate 2 is fixedly arranged on the upper surface of one end of the base 1 as shown in fig. 1 and 2; one end of the fixed rod 3 is arranged in a round hole of the first supporting plate 2 through a bearing, and the other end is fixedly provided with a triangular billboard 4; as shown in fig. 2 and 4, the adjusting mechanism 7 and the wind energy mechanism 8 are both installed on the upper surface of the base 1, and the adjusting mechanism 7 is located between the wind energy mechanism 8 and the triangular billboard 4; one end of the adjusting mechanism 7 is connected with the wind energy mechanism 8, and the other end is connected with the triangular billboard 4.

As shown in fig. 12, 13, 14 and 15, the wind energy mechanism 8 includes a blade 9, a fifth support plate 10, a sixth support plate 12, a seventh support plate 13, an eighth support plate 14, a connecting rod 15, a first ring sleeve 16, a fixed shaft 17, a first centrifugal wheel 18, a second rotating shaft 19, a third gear 20, a second centrifugal wheel 21, a connecting bar 22, a second ring sleeve 23, a friction wheel 25, a telescopic rod 27, a second gear 28, a first conical friction wheel 29, a second conical friction wheel 30, a third rotating shaft 31, a fourth gear 32, a centrifugal block 33, a first centrifugal spring 34, a first centrifugal chute 35, a centrifugal plate 36, a second centrifugal spring 37, a U-shaped plate 38, a U-shaped through slot 39 and a second centrifugal chute 40, as shown in fig. 12, wherein the fifth support plate 10, the sixth support plate 12, the seventh support plate 13 and the eighth support plate 14 are all installed on the upper surface of the base 1, and the fifth support plate 10 is located at one end of the base 1; the sixth support plate 12 and the seventh support plate 13 are located between the fifth support plate 10 and the eighth support plate 14; the sixth support plate 12 is located between the seventh support plate 13 and the fifth support plate 10; as shown in fig. 13, one end of the fixed shaft 17 is mounted on the fifth supporting plate 10, and the other end is nested with the first ring 16; a plurality of vanes 9 are uniformly arranged on the outer circular surface of the first ring sleeve 16 along the circumferential direction; as shown in fig. 14, the second rotating shaft 19 is mounted in a circular hole of the sixth supporting plate 12 through a bearing, and both ends of the second rotating shaft 19 penetrate through the sixth supporting plate 12; one end of the second rotating shaft 19 is nested with the first centrifugal wheel 18, and the other end is fixedly provided with a second centrifugal wheel 21; the third gear 20 is installed on the second rotating shaft 19, and the third gear 20 is located between the second centrifugal wheel 21 and the sixth supporting plate 12; as shown in fig. 12 and 13, one end of each of the three connecting rods 15 is fixedly mounted on the side of the first loop 16 away from the fifth support plate 10, and the other end is fixedly mounted on the side of the first centrifugal wheel 18 away from the sixth support plate 12; the three connecting rods 15 are uniformly distributed along the circumferential direction; as shown in fig. 15 and 17, the inner circumferential surface of the first centrifugal wheel 18 is uniformly opened with three first centrifugal chutes 35 in the circumferential direction; as shown in fig. 15 and 16, the three centrifugal blocks 33 are respectively installed in the three first centrifugal chutes 35 by a sliding fit manner; one ends of the three first centrifugal springs 34 are respectively mounted on the three centrifugal blocks 33, and the other ends are respectively mounted on the bottom groove surfaces of the three first centrifugal chutes 35; the three first centrifugal springs 34 are respectively positioned in the three first centrifugal chutes 35; as shown in fig. 15, three centrifugal blocks 33 are respectively engaged with the second rotating shaft 19; as shown in fig. 20, two second centrifugal chutes 40 are symmetrically formed on the outer circumferential surface of the second centrifugal wheel 21; as shown in fig. 18 and 19, the two centrifugal plates 36 are respectively installed in the two second centrifugal chutes 40 by a sliding fit; one end of each of the two second centrifugal springs 37 is mounted on each of the two centrifugal plates 36, and the other end is mounted on the bottom groove surface of each of the two second centrifugal chutes 40; the two second centrifugal springs 37 are respectively positioned in the two second centrifugal chutes 40; as shown in fig. 19, one end of each centrifugal plate 36 away from the second centrifugal spring 37 is provided with a U-shaped through slot 39; as shown in fig. 18, two U-shaped plates 38 are symmetrically installed on the outer circumferential surface of the second loop 23; one ends of the two connecting strips 22 are respectively arranged in the U-shaped through grooves 39 of the two centrifugal plates 36 through pins, and the other ends are respectively arranged in the two U-shaped plates 38 through pins; as shown in fig. 14, the telescopic rod 27 is composed of a telescopic inner rod 24 and a telescopic outer sleeve 26; the telescopic outer sleeve 26 is arranged in a round hole of the eighth support plate 14 through a bearing, and two ends of the telescopic outer sleeve 26 penetrate through the eighth support plate 14; a second gear 28 is fixedly arranged at one end of the telescopic outer sleeve 26 far away from the telescopic inner rod 24; one end of the telescopic inner rod 24 far away from the telescopic outer sleeve 26 is arranged in the second ring sleeve 23 through a bearing; the friction wheel 25 is arranged on the telescopic inner rod 24, and the friction wheel 25 is positioned between the telescopic outer sleeve 26 and the second ring sleeve 23; the third rotating shaft 31 is installed in a circular hole of the seventh supporting plate 13 through a bearing, and two ends of the third rotating shaft 31 penetrate through the seventh supporting plate 13; one end of the third rotating shaft 31 is fixedly provided with a fourth gear 32, and the other end is fixedly provided with a second conical friction wheel 30; the fourth gear 32 is located between the seventh support plate 13 and the sixth support plate 12; the fourth gear 32 is meshed with the third gear 20; the second tapered friction wheel 30 is located between the seventh support plate 13 and the eighth support plate 14; a first tapered friction wheel 29 is mounted on the eighth support plate 14 through a shaft, and the first tapered friction wheel 29 is located between the friction wheel 25 and the second tapered friction wheel 30; the first conical friction wheel 29 is frictionally engaged with the second conical friction wheel 30 and the friction wheel 25, respectively.

As shown in fig. 5, 6 and 8, the adjusting mechanism 7 includes a driving cylinder 42, a one-way clutch ring 43, a supporting ring 44, a fixed ring sleeve 45, an adjusting ring 46, a first gear 47, a first rotating shaft 48, a fourth supporting plate 49, a third supporting plate 50, a second supporting plate 51, a volute spring 52, a triangular shift lever 53, a limit block 54, a guide block 55, a guide groove 56, a first spring 57, a pushed ring 58, a limit sliding groove 59, a ring groove 60 and a slope 61, as shown in fig. 5, wherein the second supporting plate 51, the third supporting plate 50 and the fourth supporting plate 49 are all fixedly mounted on the upper surface of the base 1, and the third supporting plate 50 is located between the second supporting plate 51 and the fourth supporting plate 49; the fourth supporting plate 49 is close to the eighth supporting plate 14 in the wind energy mechanism 8, and the second supporting plate 51 is close to the triangular billboard 4; as shown in fig. 5 and 8, a support ring 44 is fixedly mounted at one end of the second support plate 51 away from the base 1; as shown in fig. 6 and 8, a one-way clutch ring 43 is mounted on the outer circumferential surface of the driving cylinder 42; the driving cylinder 42 is mounted in the supporting ring 44 by means of a one-way clutch ring 43; both ends of the driving cylinder 42 penetrate through the supporting ring 44; as shown in fig. 4, one end of the driving cylinder 42 is connected to the side of the triangular billboard 4, as shown in fig. 8, and a triangular shift lever 53 is fixedly mounted on the outer circumferential surface of the other end; as shown in fig. 5 and 8, a fixing ring sleeve 45 is fixedly installed at one end of the third supporting plate 50 far away from the base 1; the fixed ring sleeve 45 is nested on the outer circular surface of the driving cylinder 42, and the fixed ring sleeve 45 is positioned between the support ring 44 and the triangular shifting lever 53; as shown in fig. 9, the outer circumferential surface of the middle of the fixing ring 45 is provided with a ring groove 60; the ring groove 60 has an external thread on its inner circumferential surface; as shown in fig. 6 and 10, the adjusting ring 46 is nested within the ring groove 60; the adjusting ring 46 has an internal thread on its inner circumferential surface; the internal threads on the adjusting ring 46 are in threaded engagement with the external threads on the ring groove 60; the pushed ring 58 is nested in the ring groove 60; as shown in fig. 8 and 9, the side surface of the fixed ring sleeve 45 close to the triangular shift lever 53 is uniformly provided with three limit sliding grooves 59 along the circumferential direction; the three limiting sliding chutes 59 are communicated with the annular groove 60; as shown in fig. 9, two guide grooves 56 are symmetrically formed on both sides of each of the stopper slide grooves 59; as shown in fig. 6, the pushed ring 58 is located between the adjusting ring 46 and the stop runner 59; the side of the pushed ring 58 contacts the side of the adjusting ring 46.

The structure of each position-limiting sliding groove 59 in the fixing ring sleeve 45 is the same, and for any one position-limiting sliding groove 59, as shown in fig. 6, 9 and 10, the position-limiting block 54 is installed in the position-limiting sliding groove 59 in a sliding fit manner; one end of the first spring 57 is mounted on the stopper 54, and the other end is mounted on the side surface of the pushed ring 58; two guide blocks 55 are symmetrically arranged on two side surfaces of one end of the limiting block 54 connected with the first spring 57; the two guide blocks 55 are respectively arranged in the guide grooves 56 at two sides of the limit sliding groove 59 in a sliding fit manner; the end of the stop block 54 away from the first spring 57 is provided with a slope 61; as shown in FIG. 11, the inclined surface 61 of the stopper 54 is engaged with the triangular lever 53.

The first rotating shaft 48, the first gear 47 and the spiral spring 52 of the adjusting mechanism 7 are installed as follows: as shown in fig. 7, the first rotating shaft 48 is mounted in a circular hole of the fourth supporting plate 49 through a bearing, and both ends of the first rotating shaft 48 penetrate through the fourth supporting plate 49; as shown in fig. 6 and 7, one end of the first rotating shaft 48 is fixedly mounted with the first gear 47, and the other end is inserted into the driving cylinder 42; as shown in fig. 7 and 8, one end of the spiral spring 52 is mounted on the outer circumferential surface of the first rotating shaft 48 at the end away from the first gear 47, and the other end is mounted on the inner circumferential surface of the driving cylinder 42.

As shown in fig. 5, the second gear 28 meshes with the first gear 47.

As shown in fig. 14, a generatrix of the first conical friction wheel 29 in frictional contact with the friction wheel 25 is parallel to the axis of the telescopic inner rod 24; the first conical friction wheel 29 has a front conical end and a rear conical end, and the diameter of the front conical end is smaller than that of the rear conical end; the front conical end of the first conical friction wheel 29 is close to the second collar 23.

As shown in fig. 2 and 3, it further comprises a protective shell 5 and an air inlet square groove 6, as shown in fig. 2 and 3, wherein the protective shell 5 is installed on the upper surface of the base 1; the wind energy mechanism 8 and the adjusting mechanism 7 are both positioned in the protective shell 5; an air inlet square groove 6 is formed in the protective shell 5, and corresponding blades 9 in the wind energy mechanism 8 penetrate out of the air inlet square groove 6. The blades 9 penetrating through the air inlet square groove 6 are designed in such a way that the blades 9 at the upper end of the first ring sleeve 16 can be blown by outside wind, and the blades 9 at the lower end of the first ring sleeve 16 cannot be blown by outside wind under the shielding of the protective shell 5, so that the blades 9 on the first ring sleeve 16 can be smoothly blown by outside wind to rotate, and the blades 9 drive the first ring sleeve 16 to rotate.

And the billboard is internally provided with an illumination system. The design is convenient for the taxi to pass through the lighting system at night, so that the pedestrians can still see the advertising words on the triangular billboard 4.

The first centrifugal spring 34 is a compression spring; the first centrifugal spring 34 is always in a compressed state. The design is that: firstly, when the first centrifugal wheel 18 is not rotated, the centrifugal block 33 tightly presses the second rotating shaft 19 under the action of the first centrifugal spring 34; secondly, when the first centrifugal wheel 18 rotates slowly, after the pressure of the first centrifugal spring 34 is offset by the centrifugal force generated by the centrifugal block 33, the extrusion force of the centrifugal block 33 on the second rotating shaft 19 can still ensure that the centrifugal block 33 can drive the second rotating shaft 19 to rotate; third, when the first centrifugal wheel 18 rotates rapidly, after the centrifugal force generated by the centrifugal block 33 cancels the pressure of the first centrifugal spring 34, the pressing force of the centrifugal block 33 on the second rotating shaft 19 is not enough to ensure that the centrifugal block 33 can drive the second rotating shaft 19 to rotate, and further the rotation of the first centrifugal wheel 18 cannot drive the second rotating shaft 19 to rotate via the centrifugal block 33.

The second centrifugal spring 37 is an extension spring; when the second centrifugal spring 37 is not stretched, one end of the centrifugal plate 36 having the U-shaped through groove 39 is located outside the outer circular surface of the second centrifugal wheel 21.

As shown in fig. 14, the diameter of the third gear 20 is smaller than the diameter of the fourth gear 32. The design is that when the third gear 20 drives the fourth gear 32 to rotate, the rotation speed of the fourth gear 32 can be significantly slower than that of the third gear 20, so as to achieve the effect of speed reduction.

The inner circular surface of the pushed ring 58 is a smooth surface; the surface of the pushed ring 58 in contact with the adjusting ring 46 is coated with a lubricating oil. Since the internal thread of the adjusting ring 46 is threadedly engaged with the external thread of the annular groove 60, when the adjusting ring 46 is adjusted by the user, the adjusting ring 46 moves along the axis of the fixed ring sleeve 45 toward the pushed ring 58 under the action of the threaded engagement, and the adjusting ring 46 pushes the pushed ring 58 to move toward the stopper 54, so that the first spring 57 continues to be compressed. The surface of the pushed ring 58 in contact with the adjusting ring 46 is coated with a lubricating oil so that when the adjusting ring 46 rotationally pushes the pushed ring 58, the adjusting ring 46 does not rotate the pushed ring 58, thereby ensuring that the first spring 57 can be smoothly compressed. The inner circular surface of the pushed ring 58 is smooth to ensure that the pushed ring 58 can be pushed smoothly.

The first spring 57 is a compression spring, and the first spring 57 is always in a compressed state.

As shown in fig. 5, the diameter of the first gear 47 is 18 to 20 times the diameter of the second gear 28. The design is that: during the rotation of the second gear 28, the second gear 28 drives the first gear to rotate at a slower speed, so as to ensure that the first gear 47 can be driven to rotate for about one turn after the second gear 28 rotates for many turns, so that the first gear 47 can drive the triangular shifting lever 53 to pass through the corresponding limit block 54 via the first rotating shaft 48, the spiral spring 52 and the driving cylinder 42 after a period of time.

The design of the first ring sleeve 16, the connecting rod 15, the first centrifugal wheel 18, the first centrifugal spring 34, the centrifugal block 33 and the second rotating shaft 19 in the invention is as follows: the first ring sleeve 16 drives the first centrifugal wheel 18 to rotate through the connecting rod 15, and the first centrifugal spring 34 and the centrifugal block 33 rotate along with the first centrifugal wheel 18; when the first ring sleeve 16 rotates slowly, the first centrifugal wheel 18 can drive the second rotating shaft 19 to rotate through the centrifugal block 33; when the rotation speed of the first ring 16 gradually increases and reaches a certain threshold value, the first centrifugal wheel 18 cannot drive the second rotating shaft 19 to rotate via the centrifugal block 33, and at this time, the first centrifugal wheel 18 still drives the first centrifugal spring 34 and the centrifugal block 33 to rotate.

The second centrifugal chute 40, the second centrifugal spring 37 and the centrifugal plate 36 of the present invention need to satisfy: during the rotation of the second centrifugal wheel 21, the centrifugal plate 36 does not always fall out of the second centrifugal chute 40 when the centrifugal plate 36 protrudes from the second centrifugal chute 40 under centrifugal force.

The design of the second rotating shaft 19, the third gear 20, the second centrifugal wheel 21, the centrifugal plate 36, the second centrifugal spring 37, the connecting bar 22, the U-shaped plate 38, the second ring sleeve 23, the telescopic rod 27, the second gear 28, the first conical friction wheel 29, the friction wheel 25, the second conical friction wheel 30 and the fourth gear 32 is as follows: the second rotating shaft 19 drives the third rotating shaft 31 to rotate through the third gear 20 and the fourth gear 32, the third rotating shaft 31 drives the first conical friction wheel 29 to rotate through the second conical friction wheel 30, the first conical friction wheel 29 drives the telescopic inner rod 24 to rotate through the friction wheel 25, and the telescopic inner rod 24 drives the second gear 28 to rotate through the telescopic outer sleeve 26. The second rotating shaft 19 drives the second ring sleeve 23 to rotate through the second centrifugal wheel 21, the centrifugal plate 36, the connecting strip 22 and the U-shaped plate 38. Since the end of the telescopic inner rod 24 far from the telescopic outer sleeve 26 is mounted in the second ring sleeve 23 through a bearing, the rotation of the telescopic inner rod 24 and the rotation of the second ring sleeve 23 are not affected by the bearing. For the second centrifugal wheel 21, when the second centrifugal wheel 21 is not rotated, the friction wheel 25 is in friction fit with the rear conical end of the first conical friction wheel 29; when the second centrifugal wheel 21 rotates, the centrifugal plate 36 extends out of the second centrifugal wheel 21 under the action of centrifugal force, the second centrifugal spring 37 is stretched, and in the process that the centrifugal plate 36 extends out of the second centrifugal wheel 21, the centrifugal plate 36 drives the telescopic inner rod 24 to move towards the direction of the second centrifugal wheel 21 through the connecting strip 22, the U-shaped plate 38 and the second ring sleeve 23, the friction wheel 25 moves along with the telescopic inner rod 24, and then the friction wheel 25 moves towards the direction of the front cone end of the first cone-shaped friction wheel 29; when the rotation speed of the second centrifugal wheel 21 is gradually increased, the larger the distance that the second ring sleeve 23 pulls the friction wheel 25 to move towards the second centrifugal wheel 21 through the telescopic inner rod 24 is, the closer the position where the friction wheel 25 is in friction fit with the first conical friction wheel 29 is to the front conical end of the first conical friction wheel 29. That is to say: firstly, when the second centrifugal wheel 21 is not driven by the second rotating shaft 19 to rotate, the friction wheel 25 is in friction fit with the rear conical end of the first conical friction wheel 29; secondly, when the second rotating shaft 19 drives the second centrifugal wheel 21 to increase the rotating speed gradually from zero, the friction wheel 25 moves towards the front cone end direction of the first cone-shaped friction wheel 29; thirdly, when the second centrifugal wheel 21 is driven by the second rotating shaft 19 to rotate at the maximum speed, the friction wheel 25 is just in friction fit with the front cone end of the first cone-shaped friction wheel 29.

The design that the generatrix of the first conical friction wheel 29 in frictional contact with the friction wheel 25 is parallel to the axis of the telescopic inner rod 24 ensures that the friction wheel 25 can always be in frictional fit with the outer conical surface of the first conical friction wheel 29 when the friction wheel 25 moves towards the front conical end of the first conical friction wheel 29. The purpose of the movement of the friction wheel 25 in the direction of the front cone end of the first cone-shaped friction wheel 29 is to: in the process that the rotating speed of the second rotating shaft 19 is gradually increased, after the transmission of the structures, the rotating speed of the first conical friction wheel 29 is also gradually increased, and the diameter of the outer conical surface of the friction wheel 25 in friction fit with the first conical friction wheel 29 is gradually decreased, so that the rotating speed of the friction wheel 25 is kept as constant as possible in the process that the rotating speeds of the second rotating shaft 19 and the first conical friction wheel 29 are gradually increased, and finally, the rotating speed of the friction wheel 25 driving the first gear 47 through the telescopic rod 27 and the second gear 28 is kept as constant as possible.

For the design of the adjusting ring 46, the pushed ring 58, the first spring 57, the guide block 55 and the stop block 54: because the first spring 57 is always in a compressed state, the guide block 55 is located at the deepest position of the guide groove 56 under the action of the first spring 57 and the limiting block 54, so that the guide block 55 is ensured not to be separated from the guide groove 56, and the limiting block 54 is further enabled not to be separated from the limiting sliding groove 59 under the reset force of the first spring 57. The adjustment ring 46 pushes the pushed ring 58 to move toward the stopper 54, so as to further adjust the amount of compression of the first spring 57, and thus the stopper 54 is pushed into the stopper chute 59 with a greater force.

The design of the first gear 47, the first rotating shaft 48, the volute spring 52, the driving cylinder 42, the triangular shift lever 53, the limit block 54 and the one-way clutch ring 43 in the invention is as follows: the first gear 47 drives the driving cylinder 42 to rotate through the first rotating shaft 48 and the spiral spring 52, and the triangular shift lever 53 rotates along with the driving cylinder 42, as shown in fig. 8, the rotating direction of the driving cylinder 42 at this time is set to be clockwise; the driving cylinder 42 drives the triangular billboard 4 to rotate clockwise; the design of the one-way clutch ring 43 aims at: the clockwise rotation of the driving cylinder 42 is allowed and the counterclockwise rotation of the driving cylinder 42 is prohibited, thereby ensuring that the triangular signboard 4 does not rotate counterclockwise.

Inclined plane 61 on stopper 54 and triangle driving lever 53 matched with effect: first, when the first rotating shaft 48 does not rotate and the driving cylinder 42 does not rotate, the spiral spring 52 is in a natural state, and the triangular shift lever 53 contacts with the inclined surface 61 of a stopper 54; secondly, when the first rotating shaft 48 rotates, the first rotating shaft 48 drives the driving cylinder 42 to rotate through the spiral spring 52, at this time, because the first spring 57 is compressed, the triangular shift lever 53 on the driving cylinder 42 is difficult to extrude the limiting block 54 into the limiting sliding groove 59, then the triangular shift lever 53 and the driving cylinder 42 cannot rotate, and the spiral spring 52 is compressed to store energy; thirdly, when the spiral spring 52 is compressed to a certain amount, the shifting force provided by the spiral spring 52 to the triangular shifting rod 53 through the driving cylinder 42 at this time can completely extrude the stopper 54 into the stopper chute 59, and the first rotating shaft 48 can cross over the stopper 54 through the spiral spring 52, the driving cylinder 42 and the triangular shifting rod 53; fourthly, after the triangular shift lever 53 passes over the corresponding stopper 54, the driving cylinder 42 and the triangular shift lever 53 can be rapidly rotated to the position of the next stopper 54 under the continuous rotation of the second rotating shaft 19 and the return of the spiral spring 52, and then the triangular shift lever 53 is again in contact with and engaged with the inclined surface 61 of the stopper 54.

According to the invention, the increase and adjustment of the compression amount of the first spring 57 can ensure that the force of the limiting block 54 which is extruded into the limiting sliding groove 59 is larger, and further the compression amount of the scroll spring 52 is required to be larger, and finally the first rotating shaft 48 needs more time to rotate and store energy, so that the time that the first rotating shaft 48 sequentially passes through the limiting block 54 through the scroll spring 52, the driving cylinder 42 and the triangular shifting lever 53 is longer and longer, the frequency of the driving cylinder 42 driving the triangular advertising board 4 to rotate and switch is slower, and the advertising effect of the triangular advertising board 4 under different conditions is met.

The design of three stopper 54 along the circumferential direction for the rotation angle that the driving cylinder 42 crossed behind each stopper 54 through triangle driving lever 53 is 120 degrees, and then makes the rotation angle that the driving cylinder 42 drove triangle bill-board 4 set at 120 degrees, satisfies the purpose that triangle bill-board 4 propaganda triangle bill-board 4's trilateral advertisement through rotatory switching.

The specific implementation mode is as follows: the billboard is arranged on the top of a taxi. When the taxi is not running, the blade 9 does not drive the first ring sleeve 16 to rotate, the first rotating shaft 48 does not rotate, the volute spiral spring 52 is in a natural state, the triangular shifting rod 53 is in contact with the inclined surface 61 of the limiting block 54, and at the moment, the advertising surfaces on the two sides of the triangular advertising board 4 are publicized to the outside. The second centrifugal wheel 21 does not rotate, and the friction wheel 25 is in friction fit with the rear conical end of the first conical friction wheel 29.

Setting: when a taxi runs, the blades 9 are blown by wind and then drive the first ring sleeve 16 to rotate clockwise; when the running speed of the taxi reaches 30km/h, the first centrifugal wheel 18 just can not drive the second rotating shaft 19 to rotate through the centrifugal block 33.

When the taxi runs at a slow speed, the blades 9 are blown by wind to drive the first ring sleeve 16 to rotate clockwise, the first ring sleeve 16 drives the first centrifugal wheel 18 to rotate clockwise through the connecting rod 15, the first centrifugal spring 34 and the centrifugal block 33 rotate along with the first centrifugal wheel 18, and at the moment, the first centrifugal wheel 18 can drive the second rotating shaft 19 to rotate clockwise through the centrifugal block 33. As shown in fig. 14, the second rotating shaft 19 drives the second gear 28 to rotate counterclockwise through the third gear 20, the fourth gear 32, the third rotating shaft 31, the second tapered friction wheel 30, the first tapered friction wheel 29, the friction wheel 25 and the telescopic rod 27. As shown in fig. 5, the second gear 28 rotates the first gear 47 clockwise; as shown in fig. 5 and 6, the first gear 47 drives the first rotating shaft 48 to rotate clockwise, the first rotating shaft 48 drives the driving cylinder 42 to rotate through the spiral spring 52, at this time, because the first spring 57 is compressed, the triangular shift lever 53 on the driving cylinder 42 is difficult to extrude the limit block 54 into the limit sliding groove 59, so that the triangular shift lever 53 and the driving cylinder 42 cannot rotate, and the spiral spring 52 is compressed to store energy. When the spiral spring 52 is compressed to a certain amount, the shifting force of the spiral spring 52 provided to the triangular shifting lever 53 through the driving cylinder 42 can completely push the stopper 54 into the stopper chute 59, and the first rotating shaft 48 can pass over the stopper 54 through the spiral spring 52, the driving cylinder 42 and the triangular shifting lever 53. After the stopper 54 is pressed into the stopper sliding groove 59 and the triangular shift lever 53 passes over the stopper 54, the stopper 54 is moved to be reset by the reset action of the first spring 57. After the triangular shift lever 53 passes over the corresponding stopper 54, the driving cylinder 42 and the triangular shift lever 53 can be rapidly rotated to the position of the next stopper 54 under the continuous rotation of the second rotating shaft 19 and the return of the spiral spring 52, and then the triangular shift lever 53 is again in contact with and matched with the inclined surface 61 of the stopper 54, and the rotation angle of the driving cylinder 42 is 120 degrees. Then the driving cylinder 42 drives the triangular billboard 4 to rotate 120 degrees, the triangular billboard 4 drives the fixing rod 3 to rotate, and the triangular billboard 4 is switched to propagate the advertisement on the other side of the triangular billboard 4. When the triangular billboard 4 is switched to rotate next time, the process that the scroll spring 52 is compressed to a certain amount and then the triangular shift lever 53 goes over the limit block 54 is repeated.

When the running speed of the taxi is gradually increased and approaches to 30km/h, the first loop 16 drives the rotation speed of the second rotating shaft 19 to reach the maximum through the first centrifugal wheel 18. Due to the design that the friction wheel 25 moves towards the front cone end of the first cone-shaped friction wheel 29, in the process that the rotating speeds of the second rotating shaft 19 and the first cone-shaped friction wheel 29 are gradually increased, the rotating speed of the friction wheel 25 is kept unchanged as much as possible, the rotating speed of the friction wheel 25, which drives the first gear 47 through the telescopic rod 27 and the second gear 28, can be kept unchanged as much as possible, finally, the speed of the first gear 47, which drives the driving cylinder 42 to rotate intermittently through the first rotating shaft 48 and the spiral spring 52, is kept unchanged as much as possible, when the taxi runs at a speed less than 30km/h, the rotating switching speed of the triangular advertising board 4 is kept unchanged as much as possible, and the advertising effect of the triangular advertising board 4 is improved.

When the running speed of the taxi exceeds 30km/h, the first loop 16 drives the first centrifugal wheel 18 to rotate clockwise through the connecting rod 15, but the first centrifugal wheel 18 cannot drive the second rotating shaft 19 to rotate through the centrifugal block 33, so that the second rotating shaft 19 does not rotate any more, the second rotating shaft 19 does not input power any more, and the triangular billboard 4 does not rotate and switch any more. Such a design has the advantages that: when the running speed of the taxi exceeds 30km/h, pedestrians cannot easily see the advertising words of the triangular advertising board 4 clearly, the function of rotating and switching the triangular advertising board 4 has no better effect, and therefore, after the running speed of the taxi exceeds 30km/h, the triangular advertising board 4 stops rotating and switching. In addition, the design that the triangular billboard 4 stops rotating also avoids the action that the triangular billboard 4 still does not stop rotating and switching after the running speed of the taxi exceeds 30km/h, thereby reducing the structural wear of the triangular billboard 4 caused by long-time rotating and switching; the service life of the related structure is prolonged when the triangular billboard 4 is switched in rotation.

After the running speed of the taxi exceeds 30km/h, the second rotating shaft 19 does not rotate any more, the centrifugal plate 36 is reset to the original position under the reset action of the second centrifugal spring 37, and the friction wheel 25 is driven by the centrifugal plate 36 through the connecting strip 22, the U-shaped plate 38, the second ring sleeve 23 and the telescopic inner rod 24 to move and reset to the original position, namely the friction wheel 25 is in friction fit with the rear conical end of the first conical friction wheel 29.

The one-way clutch ring 43 of the present invention can limit the counterclockwise rotation of the triangular billboard 4, and the clockwise rotation of the triangular billboard 4 requires the spiral spring 52 to store enough energy before it can pass the corresponding limit block 54; when the external action causes the clockwise rotation of the triangular billboard 4, the clockwise rotation of the triangular billboard 4 needs enough energy, so that the general external action is not enough to cause the clockwise rotation of the triangular billboard 4 to switch, thereby greatly reducing the possibility that the triangular billboard 4 can be freely rotated and switched after being influenced by the external action. When the triangular billboard 4 is switched clockwise, the driving cylinder 42 can completely drive the triangular billboard 4 to rotate 120 degrees quickly under the reset force of the spiral spring 52, and the reset action of the spiral spring 52 can make up the error when the triangular billboard 4 is switched rotationally, so that the triangular billboard 4 is ensured to rotate 120 degrees every time.

In conclusion, the invention has the main beneficial effects that: the triangular billboard 4 of the invention can stop rotating and switching when the taxi runs at high speed, and intermittently rotate and switch when the taxi runs at low speed, so that the triangular billboard 4 can effectively publicize three-side advertisements, thereby greatly increasing the advertising benefit. The design that the friction wheel 25 moves towards the front cone end of the first cone-shaped friction wheel 29 can keep the rotating switching speed of the triangular advertising board 4 unchanged as much as possible when the taxi runs at different low speeds, and further improve the advertising effect of the triangular advertising board 4. In addition, the driver can push the pushed ring 58 by rotating the adjusting ring 46, so as to increase the compression amount of the first spring 57, so that the time that the first rotating shaft 48 sequentially passes through the limiting block 54 through the spiral spring 52, the driving cylinder 42 and the triangular shifting lever 53 is longer and longer, the frequency of the driving cylinder 42 driving the triangular advertising board 4 to rotate and switch is slower, and the advertising effect of the triangular advertising board 4 under different conditions is met. The invention has simple structure and better use effect.

Claims

1. A billboard used on the roof of a taxi is characterized in that: the solar energy advertising board comprises a base, a first supporting plate, a fixed rod, a triangular advertising board, an adjusting mechanism and a wind energy mechanism, wherein the first supporting plate is fixedly arranged on the upper surface of one end of the base; one end of the fixed rod is arranged in the round hole of the first supporting plate through a bearing, and the other end of the fixed rod is fixedly provided with a triangular billboard; the adjusting mechanism and the wind energy mechanism are both arranged on the upper surface of the base, and the adjusting mechanism is positioned between the wind energy mechanism and the triangular billboard; one end of the adjusting mechanism is connected with the wind energy mechanism, and the other end of the adjusting mechanism is connected with the triangular billboard;

the wind energy mechanism comprises blades, a fifth supporting plate, a sixth supporting plate, a seventh supporting plate, an eighth supporting plate, a connecting rod, a first ring sleeve, a fixed shaft, a first centrifugal wheel, a second rotating shaft, a third gear, a second centrifugal wheel, a connecting strip, a second ring sleeve, a friction wheel, a telescopic rod, a second gear, a first conical friction wheel, a second conical friction wheel, a third rotating shaft, a fourth gear, a centrifugal block, a first centrifugal spring, a first centrifugal chute, a centrifugal plate, a second centrifugal spring, a U-shaped plate, a U-shaped through groove and a second centrifugal chute, wherein the fifth supporting plate, the sixth supporting plate, the seventh supporting plate and the eighth supporting plate are all arranged on the upper surface of the base, and the fifth supporting plate is positioned at one end of the base; the sixth supporting plate and the seventh supporting plate are positioned between the fifth supporting plate and the eighth supporting plate; the sixth supporting plate is positioned between the seventh supporting plate and the fifth supporting plate; one end of the fixed shaft is arranged on the fifth supporting plate, and the other end of the fixed shaft is nested with the first ring sleeve; a plurality of blades are uniformly arranged on the outer circular surface of the first ring sleeve along the circumferential direction; the second rotating shaft is arranged in a circular hole of the sixth supporting plate through a bearing, and two ends of the second rotating shaft penetrate through the sixth supporting plate; one end of the second rotating shaft is nested with the first centrifugal wheel, and the other end of the second rotating shaft is fixedly provided with the second centrifugal wheel; the third gear is arranged on the second rotating shaft and is positioned between the second centrifugal wheel and the sixth supporting plate; one ends of the three connecting rods are respectively and fixedly arranged on the side surface of the first ring sleeve far away from the fifth supporting plate, and the other ends of the three connecting rods are respectively and fixedly arranged on the side surface of the first centrifugal wheel far away from the sixth supporting plate; the three connecting rods are uniformly distributed along the circumferential direction; the inner circular surface of the first centrifugal wheel is uniformly provided with three first centrifugal chutes along the circumferential direction; the three centrifugal blocks are respectively arranged in the three first centrifugal chutes in a sliding fit manner; one end of each of the three first centrifugal springs is respectively arranged on the three centrifugal blocks, and the other end of each of the three first centrifugal springs is respectively arranged on the bottom groove surfaces of the three first centrifugal chutes; the three first centrifugal springs are respectively positioned in the three first centrifugal chutes; the three centrifugal blocks are respectively matched with the second rotating shaft; two second centrifugal chutes are symmetrically arranged on the outer circular surface of the second centrifugal wheel; the two centrifugal plates are respectively arranged in the two second centrifugal chutes in a sliding fit manner; one end of each of the two second centrifugal springs is mounted on the two centrifugal plates, and the other end of each of the two second centrifugal springs is mounted on the bottom groove surfaces of the two second centrifugal chutes; the two second centrifugal springs are respectively positioned in the two second centrifugal chutes; one end of each centrifugal plate, which is far away from the second centrifugal spring, is provided with a U-shaped through groove; two U-shaped plates are symmetrically arranged on the outer circular surface of the second ring sleeve; one ends of the two connecting strips are respectively arranged in the U-shaped through grooves of the two centrifugal plates through pins, and the other ends of the two connecting strips are respectively arranged in the two U-shaped plates through pins; the telescopic rod consists of a telescopic inner rod and a telescopic outer sleeve; the telescopic outer sleeve is arranged in a round hole of the eighth supporting plate through a bearing, and two ends of the telescopic outer sleeve penetrate through the eighth supporting plate; a second gear is fixedly arranged at one end of the telescopic outer sleeve far away from the telescopic inner rod; one end of the telescopic inner rod, which is far away from the telescopic outer sleeve, is arranged in the second ring sleeve through a bearing; the friction wheel is arranged on the telescopic inner rod and is positioned between the telescopic outer sleeve and the second ring sleeve; the third rotating shaft is arranged in a round hole of the seventh supporting plate through a bearing, and two ends of the third rotating shaft penetrate through the seventh supporting plate; one end of the third rotating shaft is fixedly provided with a fourth gear, and the other end of the third rotating shaft is fixedly provided with a second conical friction wheel; the fourth gear is positioned between the seventh supporting plate and the sixth supporting plate; the fourth gear is meshed with the third gear; the second conical friction wheel is positioned between the seventh supporting plate and the eighth supporting plate; the first conical friction wheel is arranged on the eighth supporting plate through a shaft and is positioned between the friction wheel and the second conical friction wheel; the first conical friction wheel is in friction fit with the second conical friction wheel and the friction wheel respectively;

the adjusting mechanism comprises a driving cylinder, a one-way clutch ring, a support ring, a fixed ring sleeve, an adjusting ring, a first gear, a first rotating shaft, a fourth support plate, a third support plate, a second support plate, a volute spring, a triangular deflector rod, a limiting block, a guide groove, a first spring, a pushed ring, a limiting chute, an annular groove and an inclined plane, wherein the second support plate, the third support plate and the fourth support plate are fixedly arranged on the upper surface of the base, and the third support plate is positioned between the second support plate and the fourth support plate; the fourth supporting plate is close to an eighth supporting plate in the wind energy mechanism, and the second supporting plate is close to the triangular billboard; a support ring is fixedly arranged at one end of the second support plate far away from the base; a unidirectional clutch ring is arranged on the outer circular surface of the driving cylinder; the driving cylinder is arranged in the supporting ring through a one-way clutch ring; both ends of the driving cylinder penetrate out of the supporting rings; one end of the driving cylinder is connected with the side surface of the triangular billboard, and a triangular deflector rod is fixedly arranged on the outer circular surface of the other end; a fixed ring sleeve is fixedly arranged at one end of the third supporting plate far away from the base; the fixed ring sleeve is nested on the outer circular surface of the driving cylinder and is positioned between the support ring and the triangular deflector rod; the outer circle surface of the middle position of the fixed ring sleeve is provided with a ring groove; the inner circular surface of the ring groove is provided with an external thread; the adjusting ring is nested in the ring groove; the inner circular surface of the adjusting ring is provided with an internal thread; the internal thread on the adjusting ring is in threaded fit with the external thread on the ring groove; the pushed ring is nested in the ring groove; the side surface of the fixed ring sleeve close to the triangular shifting rod is uniformly provided with three limiting sliding grooves along the circumferential direction; the three limiting sliding chutes are communicated with the ring groove; two guide grooves are symmetrically formed in two sides of each limiting sliding groove; the pushed ring is positioned between the adjusting ring and the limiting sliding groove; the side surface of the pushed ring is contacted with the side surface of the adjusting ring;

the structure of each limiting chute in the fixed ring sleeve is the same, and for any one limiting chute, a limiting block is arranged in the limiting chute in a sliding fit manner; one end of the first spring is arranged on the limiting block, and the other end of the first spring is arranged on the side surface of the pushed ring; two guide blocks are symmetrically arranged on two side surfaces of one end, connected with the first spring, of the limiting block; the two guide blocks are respectively arranged in the guide grooves at two sides of the limiting sliding chute in a sliding fit manner; one end of the limiting block, which is far away from the first spring, is provided with an inclined plane; the inclined plane on the limiting block is matched with the triangular shifting lever;

the first rotating shaft, the first gear and the volute spiral spring in the adjusting mechanism are arranged as follows: the first rotating shaft is arranged in a round hole of the fourth supporting plate through a bearing, and two ends of the first rotating shaft penetrate through the fourth supporting plate; one end of the first rotating shaft is fixedly provided with a first gear, and the other end of the first rotating shaft is inserted into the driving cylinder; one end of the volute spiral spring is arranged on the outer circular surface of one end of the first rotating shaft, which is far away from the first gear, and the other end of the volute spiral spring is arranged on the inner circular surface of the driving cylinder;

the second gear is meshed with the first gear;

a generatrix of the first conical friction wheel in frictional contact with the friction wheel is parallel to the axis of the telescopic inner rod; the first conical friction wheel is provided with a front conical end and a rear conical end, and the diameter of the front conical end is smaller than that of the rear conical end; the front cone end of the first cone-shaped friction wheel is close to the second ring sleeve;

the air inlet square groove is arranged on the upper surface of the base; the wind energy mechanism and the adjusting mechanism are both positioned in the protective shell; an air inlet square groove is formed in the protective shell, and corresponding blades in the wind energy mechanism penetrate through the air inlet square groove;

the triangular billboard is provided with an illuminating system;

the first centrifugal spring is a compression spring; the first centrifugal spring is always in a compressed state.

2. A billboard for use on a roof of a taxi according to claim 1, in which: the second centrifugal spring is an extension spring; when the second centrifugal spring is not stretched, one end of the centrifugal plate with the U-shaped through groove is positioned on the outer side of the outer circular surface of the second centrifugal wheel.

3. A billboard for use on a roof of a taxi according to claim 1, in which: the diameter of the third gear is smaller than that of the fourth gear.

4. A billboard for use on a roof of a taxi according to claim 1, in which: the inner circle surface of the pushed ring is a smooth surface; the surface of the pushed ring, which is contacted with the adjusting ring, is coated with lubricating oil.

5. A billboard for use on a roof of a taxi according to claim 1, in which: the first spring is a compression spring and is always in a compression state.

6. A billboard for use on a roof of a taxi according to claim 1, in which: the diameter of the first gear is 15-18 times of that of the second gear.