High-speed limit board switching mechanism

Abstract

The invention provides a high-speed speed limiting board switching mechanism, and belongs to the technical field of high-speed speed limiting facilities, the high-speed speed limiting board switching mechanism comprises a main board body, a support rod, a first driving assembly and a second driving assembly, a round hole is formed in the main board body, a speed limiting board is embedded in the round hole, and different speed values are printed on the two opposite sides of the speed limiting board. The support rod is arranged on the back face of the main board body and used for supporting the main board body, the first driving assembly and the second driving assembly are installed on the support rod, and the first driving assembly is used for driving the speed limiting board to move in a reciprocating mode in the direction perpendicular to the main board body. Compared with the prior art, different speed limit values are set on the two sides of the speed limit board, and the first driving assembly and the second driving assembly are matched, so that automatic switching of speed limit can be achieved, speed reduction reminding can be conveniently given to a rear vehicle when a traffic accident occurs on a front road or construction is carried out, and the safety of the vehicle is improved. The method has the advantage that speed limiting switching is convenient and fast.

Description

Technical Field

[0001] This invention belongs to the technical field of highway speed limit facilities, specifically a highway speed limit sign switching mechanism. Background Technology

[0002] Speed ​​limit signs are signs used in road traffic to indicate the maximum or minimum speed limits for vehicles, and serve as a warning.

[0003] Currently, when a traffic accident occurs on a highway or road construction is required, workers typically need to move a new speed limit sign to the location of the original speed limit sign. Then, a lifting device is used to lift the new speed limit sign, obscuring the original one and thus switching the speed limit. The switched speed limit sign displays a lower speed limit to remind following vehicles to slow down in time and avoid secondary accidents. However, this method of switching speed limit signs is relatively traditional. On the one hand, switching speed limit signs is time-consuming and labor-intensive. On the other hand, after the traffic accident is cleared or the road construction is completed, workers still need to return to the location of the speed limit sign to remove the new sign and restore the original speed limit. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a high-speed speed limit sign switching mechanism.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A high-speed speed limit sign switching mechanism includes a main sign body, a support rod, a first drive assembly, and a second drive assembly. The main body of the sign has a circular hole, and a speed limit sign is embedded in the circular hole. Different speed values ​​are printed on opposite sides of the speed limit sign. The support rod is located on the back of the main sign body and is used to provide support for the main sign body. The first drive assembly and the second drive assembly are mounted on the support rod. The first drive component is used to drive the speed limit sign to reciprocate in a direction perpendicular to the main sign body. When the speed limit sign approaches the main sign body, the second drive component is used to drive the speed limit sign to rotate 180°.

[0006] As a further improvement of the present invention: the first driving assembly includes an air supply pipe, a piston rod, a first piston sleeve, and a first L-shaped connecting rod. The first piston sleeve is fixedly mounted on the support rod. One end of the piston rod extends into the first piston sleeve and telescopically engages with the first piston sleeve. The other end extends to the outside of the first piston sleeve and is connected to the speed limit sign through the first L-shaped connecting rod. The air supply pipe is fixedly mounted on the side wall of the support rod. One end of the air supply pipe is connected to the external air pump, and the other end is connected to the first piston sleeve. The external air pump is mounted on the support rod.

[0007] As a further improvement of the present invention: a shaft is fixedly provided on the side wall of the speed limit sign, and the end of the first L-shaped connecting rod away from the piston rod is sleeved on the outside of the shaft and rotatably engaged with the shaft. The second drive assembly includes a gear, a second L-shaped connecting rod, a helical gear plate, and a first spring. The gear is fixedly mounted outside the shaft. One end of the second L-shaped connecting rod is fixedly connected to the support rod, and the other end extends to the side of the gear. Several sets of helical gears are provided. Several helical gears are hinged to the side wall of the second L-shaped connecting rod and can mesh with the gear in one direction. One side of each set of helical gears is connected to the second L-shaped connecting rod through a set of first springs. The first springs are used to provide elastic support for the helical gears.

[0008] As a further improvement of the present invention: the edge of the circular hole on the main body is provided with a slot for accommodating the shaft and the gear.

[0009] As a further improvement to the present invention: the high-speed speed limit sign switching mechanism further includes a cleaning component. When the external air pump supplies air into the first piston sleeve through the air supply pipe, thereby driving the speed limit sign to move towards the back of the main sign body, the cleaning component is used to clean the side wall of the speed limit sign.

[0010] As a further improvement of the present invention: the cleaning assembly includes a wiping component and a power component mounted on the support rod. When the external air pump supplies air into the first piston sleeve through the air supply pipe, thereby driving the speed limit sign to move toward the back of the main sign body, the power component is used to drive the wiping component to rotate against the side wall of the speed limit sign.

[0011] As a further improvement of the present invention: the wiping component includes a support rod, a flexible wiping strip, and a second piston sleeve. One end of the second piston sleeve is movably fitted outside the first piston sleeve, and the other end is fixedly connected to the support rod. The support rod is perpendicular to the second piston sleeve, and the flexible wiping strip is fixedly disposed on the side wall of the support rod. The power component includes a spiral groove and a protrusion. The spiral groove is formed on the outer wall of the first piston sleeve, and the protrusion is fixedly installed on the inner wall of the second piston sleeve. The protrusion extends into the spiral groove and slides in cooperation with the spiral groove.

[0012] As a further improvement of the present invention: a second spring is also provided inside the second piston sleeve, one end of the second spring being connected to the inner wall of the second piston sleeve and the other end being connected to the end of the first piston sleeve, for providing elastic support for the second piston sleeve.

[0013] As a further improvement to the present invention: the cleaning component further includes a water supply component, When the external air pump supplies air into the first piston sleeve through the air supply pipe, thereby driving the speed limit sign to move towards the back of the main sign body, the water supply component is used to supply water to the side wall of the speed limit sign.

[0014] As a further improvement of the present invention: a flexible water inlet pipe is provided on the side wall of the second piston sleeve, and the end of the flexible water inlet pipe away from the second piston sleeve is connected to an external water tank. The external water tank is fixedly installed on the support rod or placed near the road edge of the support rod. The water supply component includes a water supply strip. The water supply bar is fixedly installed on the outer wall of the second piston sleeve. The water supply bar is perpendicular to the second piston sleeve. The water supply bar has a water supply channel that communicates with the inner cavity of the second piston sleeve. Several spray holes are opened on the side wall of the water supply bar. One-way valves are installed inside the flexible water inlet pipe and the water supply channel. Water is stored inside the second piston sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this embodiment of the invention, initially, the speed limit sign is located inside the circular hole, and the side of the speed limit sign with the normal speed value (e.g., 120 km / h) faces the direction of oncoming traffic. When a traffic accident or construction occurs ahead, requiring a speed reduction reminder for vehicles behind, the first drive component moves the speed limit sign in a direction perpendicular to the main sign body. At this time, the speed limit sign moves out of the circular hole and away from the main sign body. Then, the first drive component moves the speed limit sign in the opposite direction in a direction perpendicular to the main sign body. At this time, the speed limit sign moves closer to the main sign body and then moves back into the circular hole. During this process, the second drive component drives... The speed limit sign rotates 180° so that after moving in the opposite direction into the circular hole, the side with the lower speed value (e.g., 60 km / h) faces the direction of oncoming traffic. This serves as a reminder to following vehicles to slow down, thereby reducing the probability of accidents and improving safety. Compared to existing technologies, by setting different speed limits on both sides of the speed limit sign, and in conjunction with the first and second drive components, automatic speed limit switching can be achieved. This allows for speed reduction reminders to following vehicles when there is a traffic accident or construction ahead, offering the advantage of convenient and quick speed limit switching. Attached Figure Description

[0016] Figure 1 A schematic diagram of the front structure of a high-speed speed limit sign switching mechanism. Figure 1 ; Figure 2 A schematic diagram of the front structure of a high-speed speed limit sign switching mechanism. Figure 2 ; Figure 3 This is a schematic diagram of the rear structure of a high-speed speed limit sign switching mechanism; Figure 4 for Figure 1 Enlarged view of region A in the middle; Figure 5 for Figure 2 Enlarged view of region B in the middle; Figure 6 for Figure 3 Enlarged diagram of region C in the middle; Figure 7 for Figure 3 Enlarged schematic diagram of region D in the middle; Figure 8 for Figure 3 Enlarged schematic diagram of region E in the middle; In the diagram: 10-Main sign body, 101-Speed ​​limit sign, 1011-Shaft, 102-Groove, 20-Bracket rod, 30-First drive assembly, 301-Air supply pipe, 302-Piston rod, 303-First piston sleeve, 304-First L-shaped connecting rod, 40-Second drive assembly, 401-Gear, 402-Second L-shaped connecting rod, 403-Helical gear, 404-First spring, 50-Cleaning assembly, 501-Wiping component, 5011-Support rod, 5012-Flexible wiping strip, 5013-Second piston sleeve, 5014-Second spring, 5015-Flexible water inlet pipe, 502-Water supply component, 5021-Water supply strip, 5022-Spray nozzle, 5023-Water supply channel, 503-Power component, 5031-Spiral groove, 5032-Protrusion. Detailed Implementation

[0017] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Please see Figure 1 , Figure 2 as well as Figure 3This embodiment provides a high-speed speed limit sign switching mechanism, including a main sign body 10, a support rod 20, a first drive assembly 30, and a second drive assembly 40. The main sign body 10 has a circular hole, and a speed limit sign 101 is embedded in the circular hole. The speed limit sign 101 has different speed values ​​printed on opposite sides, for example, a speed value of 120 yards on one side and a speed value of 60 yards on the other side. The support rod 20 is disposed on the back of the main sign body 10 and is used to support the main sign body 10. The first drive assembly 30 and the second drive assembly 40 are mounted on the support rod 20. The first drive assembly 30 is used to drive the speed limit sign 101 to reciprocate in a direction perpendicular to the main sign body 10. When the speed limit sign 101 is close to the main sign body 10, the second drive assembly 40 is used to drive the speed limit sign 101 to rotate 180°.

[0022] Initially, the speed limit sign 101 is located inside the circular hole, with the side of the speed limit sign 101 bearing the normal speed value (e.g., 120 km / h) facing the direction of oncoming traffic. When a traffic accident or construction occurs ahead, requiring a speed reduction reminder for following vehicles, the first drive assembly 30 moves the speed limit sign 101 in a direction perpendicular to the main sign body 10. At this time, the speed limit sign 101 moves out of the circular hole and away from the main sign body 10. Then, the first drive assembly 30 moves the speed limit sign 101 in the opposite direction perpendicular to the main sign body 10. At this time, the speed limit sign 101 moves closer to the main sign body 10 and moves back into the circular hole. During this process, the second drive assembly 40 rotates the speed limit sign 101 180°, so that after the speed limit sign 101 moves back into the circular hole, the side bearing the lower speed value (e.g., 60 km / h) faces the direction of oncoming traffic, thus reminding following vehicles to slow down, thereby reducing the probability of accidents and improving safety.

[0023] Please see Figure 2 In one embodiment, the first drive assembly 30 includes an air supply pipe 301, a piston rod 302, a first piston sleeve 303, and a first L-shaped connecting rod 304. The first piston sleeve 303 is fixedly mounted on the support rod 20. One end of the piston rod 302 extends into the interior of the first piston sleeve 303 and telescopically engages with the first piston sleeve 303, while the other end extends into the exterior of the first piston sleeve 303 and is connected to the speed limit sign 101 via the first L-shaped connecting rod 304. The air supply pipe 301 is fixedly mounted on the side wall of the support rod 20. One end of the air supply pipe 301 is connected to an external air pump (not shown in the figure), and the other end is connected to the first piston sleeve 303. The external air pump is mounted on the support rod 20.

[0024] When a traffic accident or road construction ahead necessitates a speed reduction warning for vehicles behind, staff control an external air pump. The external air pump supplies air to the first piston sleeve 303 via an air supply pipe 301. The air entering the first piston sleeve 303 pushes the piston rod 302, causing it to move outwards from the first piston sleeve 303. As the piston rod moves, it pulls the speed limit sign 101 through the first L-shaped connecting rod 304, causing it to move out of the circular hole and towards the back of the main sign body 10. Once the speed limit sign 101 reaches the predetermined position, staff control the external air pump to reverse its operation, drawing air out of the first piston sleeve 303 via the air supply pipe 301. This causes the piston rod 302 to move inwards from the first piston sleeve 303. As the piston rod moves, it pushes the speed limit sign 101 closer to the main sign body 10 and back into the circular hole.

[0025] Please see Figure 2 , Figure 4 as well as Figure 6 A shaft 1011 is fixedly installed on the side wall of the speed limit sign 101. The end of the first L-shaped connecting rod 304 away from the piston rod 302 is sleeved on the outside of the shaft 1011 and rotates with the shaft 1011. The second drive assembly 40 includes a gear 401, a second L-shaped connecting rod 402, a helical gear 403, and a first spring 404. The gear 401 is fixedly installed on the outside of the shaft 1011. One end of the second L-shaped connecting rod 402 is fixedly connected to the support rod 20, and the other end extends to the side of the gear 401. Several groups of helical gears 403 are provided. Several helical gears 403 are hinged on the side wall of the second L-shaped connecting rod 402 and can mesh with the gear 401 in one direction. One side of each group of helical gears 403 is connected to the second L-shaped connecting rod 402 through a group of first springs 404. The first springs 404 are used to provide elastic support for the helical gears 403.

[0026] When an external air pump supplies air into the first piston sleeve 303, thereby moving the piston rod 302 and the first L-shaped connecting rod 304, the first L-shaped connecting rod 304 pulls the shaft 1011, thereby causing the speed limit sign 101 and the gear 401 to move synchronously. The gear 401 moves along one side of the second L-shaped connecting rod 402. At this time, the gear 401 pushes several helical gears 403, causing the helical gears 403 to deflect sequentially towards the second L-shaped connecting rod 402. The helical gears 403 cannot drive the gear 401 to rotate, and therefore cannot drive the shaft 1011 and the speed limit sign 101 to rotate. When the speed limit sign... After 101 moves to the predetermined position, the external air pump removes the air from inside the first piston sleeve 303, thereby driving the piston rod 302 and the first L-shaped connecting rod 304 to move in the opposite direction. The first L-shaped connecting rod 304 pushes the shaft 1011, thereby driving the shaft 1011, gear 401, and speed limit sign 101 to move in the opposite direction. During this process, gear 401 acts in the opposite direction on several helical gears 403 and meshes with several helical gears 403. Several helical gears 403 drive gear 401, shaft 1011, and speed limit sign 101 to rotate. When several helical gears 403 have finished meshing with gear 401, gear 401... 01. The shaft 1011 and speed limit sign 101 rotate 180° as a whole, and the speed limit sign 101 re-enters the round hole. At this time, the side of the speed limit sign 101 with the lower speed value faces the direction of oncoming traffic to remind following vehicles to slow down. After the road accident is cleared or the road construction is completed, the staff can control the external air pump to work again. The external air pump supplies air to the first piston sleeve 303 through the air supply pipe 301, thereby pushing the piston rod 302 and the first L-shaped connecting rod 304 to move again. The first L-shaped connecting rod 304 pulls the shaft 1011 again, which in turn drives the speed limit sign 101 to move. As gear 401 moves back to the back of the main sign body 10, when the speed limit sign 101 moves to the predetermined position again, the staff controls the external air pump to work in reverse to draw the air out of the first piston sleeve 303 through the air supply pipe 301. The piston rod 302 and the first L-shaped connecting rod 304 move in reverse again, and the speed limit sign 101 and gear 401 move in reverse again. Through the meshing action between several helical gears 403 and gear 401, the speed limit sign 101 is driven to rotate 180° again, thereby displaying the previous normal speed limit value to the oncoming vehicle and realizing the reset of the speed limit sign 101.

[0027] Please see Figure 4 as well as Figure 6 In one embodiment, the edge of the circular hole on the main body 10 is provided with a slot 102 for accommodating the shaft 1011 and the gear 401.

[0028] Because the speed limit sign 101 is suspended above or on the edge of the road, it is constantly exposed to the outdoors. The sides of the sign are easily covered in dust, which affects the clarity of the speed limit value and makes it difficult for drivers to see the actual speed limit. This poses a significant safety hazard. Therefore, please refer to [link / reference needed]. Figure 2 In one embodiment, the high-speed speed limit sign switching mechanism further includes a cleaning component 50. When the external air pump supplies air to the inside of the first piston sleeve 303 through the air supply pipe 301, thereby driving the speed limit sign 101 to move toward the back of the main sign body 10, the cleaning component 50 is used to clean the side wall of the speed limit sign 101 to prevent excessive dust on the side wall of the speed limit sign 101 from making it impossible for the driver to see the speed limit value, thereby improving safety.

[0029] Please see Figure 5 as well as Figure 8 In one embodiment, the cleaning assembly 50 includes a wiping component 501 and a power component 503 mounted on the support rod 20. When the external air pump supplies air to the inside of the first piston sleeve 303 through the air supply pipe 301, thereby driving the speed limit sign 101 to move toward the back of the main sign body 10, the power component 503 is used to drive the wiping component 501 to rotate against the side wall of the speed limit sign 101, so as to wipe the dust on the side wall of the speed limit sign 101 and achieve the cleaning of the side wall of the speed limit sign 101.

[0030] For details, please continue reading. Figure 5 as well as Figure 8 In one embodiment, the wiping component 501 includes a support rod 5011, a flexible wiping strip 5012, and a second piston sleeve 5013. One end of the second piston sleeve 5013 is movably sleeved outside the first piston sleeve 303, and the other end is fixedly connected to the support rod 5011. The support rod 5011 and the second piston sleeve 5013 are perpendicular to each other. The flexible wiping strip 5012 is fixedly disposed on the side wall of the support rod 5011. The power component 503 includes a spiral groove 5031 and a protrusion 5032. The spiral groove 5031 is formed on the outer wall of the first piston sleeve 303, and the protrusion 5032 is fixedly installed on the inner wall of the second piston sleeve 5013. The protrusion 5032 extends into the spiral groove 5031 and slides in cooperation with the spiral groove 5031.

[0031] When an external air pump supplies air into the first piston sleeve 303 through the air supply pipe 301, thereby driving the speed limit sign 101 to move towards the back of the main sign body 10, the gear 401 moves along one side of the second L-shaped connecting rod 402. After the gear 401 sequentially pushes and disengages from several helical gears 403, the side wall of the speed limit sign 101 acts on the flexible wiping strip 5012, thereby pushing the support rod 5011 and the second piston sleeve 5013, causing the second piston sleeve 5013 to move along the outside of the first piston sleeve 303. When the second piston sleeve 5013 moves, it drives the protrusion 5032 to slide along the inside of the spiral groove 5031. Due to the movement of the first piston sleeve 303 and the spiral... With the groove 5031 in a fixed state, the spiral groove 5031 can push the protrusion 5032, thereby causing the second piston sleeve 5013 to rotate relative to the first piston sleeve 303. The second piston sleeve 5013 drives the support rod 5011 to rotate, and the support rod 5011 drives the flexible wiping strip 5012 to rotate against the side wall of the speed limit sign 101, thereby wiping away the dust on the side wall of the speed limit sign 101 and cleaning the side wall of the speed limit sign 101. This allows the speed value on the side wall of the speed limit sign 101 to be clearly displayed to drivers after the speed limit sign 101 rotates 180° and re-enters the circular hole, thus improving the speed limit effect and safety.

[0032] Please see Figure 8 In one embodiment, a second spring 5014 is also provided inside the second piston sleeve 5013. One end of the second spring 5014 is connected to the inner wall of the second piston sleeve 5013, and the other end is connected to the end of the first piston sleeve 303, for providing elastic support for the second piston sleeve 5013.

[0033] When the sidewall of the speed limit sign 101 acts on the flexible wiping strip 5012, thereby pushing the second piston sleeve 5013 to move along the outside of the first piston sleeve 303, the second spring 5014 is compressed, and the second piston sleeve 5013 rotates under the cooperation of the spiral groove 5031 and the protrusion 5032. Therefore, the second spring 5014 twists while being compressed. When the external air pump works in reverse to remove the air from the inside of the first piston sleeve 303, thereby driving the speed limit sign 101 and the gear 401 to move in the opposite direction, the speed limit sign 101 moves closer to the main sign body 10, and the second spring 5014 pushes the second piston sleeve 5013 so that the second piston sleeve 5013 moves along the outside of the first piston sleeve 303. When the sleeve 303 moves in the opposite direction, the reverse engagement between the spiral groove 5031 and the protrusion 5032 drives the second piston sleeve 5013 and the support rod 5011 to rotate in the opposite direction. The support rod 5011 drives the flexible wiping strip 5012 to rotate in the opposite direction against the side wall of the speed limit sign 101, thereby wiping the side wall of the speed limit sign 101 again. When the second piston sleeve 5013, the support rod 5011 and the flexible wiping strip 5012 move in the opposite direction to the initial position, the speed limit sign 101 separates from the flexible wiping strip 5012. In the subsequent reverse movement, the gear 401 meshes with several helical gears 403, thereby driving the speed limit sign 101 to rotate 180°.

[0034] Please see Figure 5 In one embodiment, the cleaning component 50 further includes a water supply component 502. When the external air pump supplies air to the inside of the first piston sleeve 303 through the air supply pipe 301, thereby driving the speed limit sign 101 to move toward the back of the main sign body 10, the water supply component 502 is used to supply water to the side wall of the speed limit sign 101. This, combined with the rotational wiping action of the flexible wiping strip 5012 on the side wall of the speed limit sign 101, improves the cleaning effect of dust on the side wall of the speed limit sign 101.

[0035] For details, please refer to Figure 5 , Figure 7 as well as Figure 8In one embodiment, a flexible water inlet pipe 5015 is provided on the side wall of the second piston sleeve 5013. The end of the flexible water inlet pipe 5015 away from the second piston sleeve 5013 is connected to an external water tank (not shown in the figure). The external water tank is fixedly installed on the support rod 20 or placed near the road edge of the support rod 20. The water supply component 502 includes a water supply strip 5021. The water supply strip 5021 is fixedly installed on the outer wall of the second piston sleeve 5013. The water supply strip 5021 is perpendicular to the second piston sleeve 5013. A water supply channel 5023 communicating with the inner cavity of the second piston sleeve 5013 is provided inside the water supply strip 5021. A plurality of spray holes 5022 are opened on the side wall of the water supply strip 5021. A one-way valve (not shown in the figure) is provided inside both the flexible water inlet pipe 5015 and the water supply channel 5023. The second piston sleeve 5013 contains a water source.

[0036] When the side wall of the speed limit sign 101 acts on the flexible wiping strip 5012, thereby driving the second piston sleeve 5013 to move along the outside of the first piston sleeve 303, the one-way valve inside the flexible water inlet pipe 5015 closes, and the one-way valve inside the water supply channel 5023 opens. The first piston sleeve 303 pressurizes the water source inside the second piston sleeve 5013 to the water supply channel 5023 inside the water supply strip 5021, and then sprays it out through several nozzles 5022, thereby acting on the side wall of the speed limit sign 101, in conjunction with the flexible wiping strip 5012. 012 rotates against the side wall of the speed limit sign 101, thereby improving the cleaning effect of the side wall of the speed limit sign 101; when the speed limit sign 101 approaches the main sign body 10, causing the second piston sleeve 5013 to move in the opposite direction along the outside of the first piston sleeve 303, the one-way valve inside the flexible water inlet pipe 5015 opens, and the one-way valve inside the water supply channel 5023 closes. The first piston sleeve 303 draws water from the external water tank through the flexible water inlet pipe 5015 into the second piston sleeve 5013, realizing automatic water replenishment.

[0037] In one embodiment, the flexible wiping strip 5012 can be a rubber strip or a silicone strip, and there is no limitation on this.

[0038] In this embodiment of the invention, initially, the speed limit sign 101 is located inside the circular hole, and the side of the speed limit sign 101 with the normal speed value (e.g., 120 km / h) faces the direction of oncoming traffic. When a traffic accident or construction occurs ahead, requiring a speed reduction reminder for vehicles behind, the first drive component 30 moves the speed limit sign 101 in a direction perpendicular to the main sign body 10. At this time, the speed limit sign 101 moves out of the circular hole and away from the main sign body 10. Then, the first drive component 30 moves the speed limit sign 101 in the opposite direction perpendicular to the main sign body 10. At this time, the speed limit sign 101 moves closer to the main sign body 10 and moves back into the circular hole. During this process, the first drive component 30 moves the speed limit sign 101 in the opposite direction perpendicular to the main sign body 10. The second drive assembly 40 rotates the speed limit sign 101 180°, so that after the speed limit sign 101 moves in the opposite direction into the round hole, the side with the smaller speed value (e.g., 60 km / h) faces the direction of oncoming traffic, so as to remind following vehicles to slow down, thereby reducing the probability of accidents and improving safety. Compared with the prior art, by setting different speed limit values ​​on both sides of the speed limit sign 101, in conjunction with the first drive assembly 30 and the second drive assembly 40, automatic speed limit switching can be achieved, so as to remind following vehicles to slow down when there is a traffic accident or construction ahead, which has the advantages of convenient and quick speed limit switching.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A high-speed speed limit sign switching mechanism, characterized in that, It includes the main body (10), the support rod (20), the first drive assembly (30) and the second drive assembly (40). The main body (10) has a circular hole, and a speed limit sign (101) is embedded in the circular hole. Different speed values ​​are printed on opposite sides of the speed limit sign (101). The support rod (20) is disposed on the back of the main plate body (10) to provide support for the main plate body (10). The first drive assembly (30) and the second drive assembly (40) are mounted on the support rod (20). The first drive component (30) is used to drive the speed limit sign (101) to reciprocate in a direction perpendicular to the main sign body (10). When the speed limit sign (101) approaches the main sign body (10), the second drive assembly (40) is used to drive the speed limit sign (101) to rotate 180°.

2. The high-speed speed limit sign switching mechanism according to claim 1, characterized in that, The first drive assembly (30) includes an air supply pipe (301), a piston rod (302), a first piston sleeve (303), and a first L-shaped connecting rod (304). The first piston sleeve (303) is fixedly mounted on the support rod (20). One end of the piston rod (302) extends into the first piston sleeve (303) and is telescopically engaged with the first piston sleeve (303). The other end extends to the outside of the first piston sleeve (303) and is connected to the speed limit sign (101) through the first L-shaped connecting rod (304). The air supply pipe (301) is fixedly mounted on the side wall of the support rod (20). One end of the air supply pipe (301) is connected to the external air pump, and the other end is connected to the first piston sleeve (303). The external air pump is mounted on the support rod (20).

3. The high-speed speed limit sign switching mechanism according to claim 2, characterized in that, A shaft (1011) is fixedly installed on the side wall of the speed limit sign (101). The end of the first L-shaped connecting rod (304) away from the piston rod (302) is sleeved on the outside of the shaft (1011) and rotates in cooperation with the shaft (1011). The second drive assembly (40) includes a gear (401), a second L-shaped connecting rod (402), a helical gear (403), and a first spring (404). The gear (401) is fixedly mounted outside the shaft (1011). One end of the second L-shaped connecting rod (402) is fixedly connected to the support rod (20), and the other end extends to the side of the gear (401). Several sets of helical gears (403) are provided. Several helical gears (403) are hinged on the side wall of the second L-shaped connecting rod (402) and can mesh with the gear (401) in one direction. One side of each set of helical gears (403) is connected to the second L-shaped connecting rod (402) through a set of first springs (404). The first springs (404) are used to provide elastic support for the helical gears (403).

4. The high-speed speed limit sign switching mechanism according to claim 3, characterized in that, The edge of the circular hole on the main body (10) is provided with a slot (102) for accommodating the shaft (1011) and the gear (401).

5. A high-speed speed limit sign switching mechanism according to claim 2, characterized in that, The high-speed speed limit sign switching mechanism also includes a cleaning component (50). When the external air pump supplies air into the first piston sleeve (303) through the air supply pipe (301) and drives the speed limit sign (101) to move toward the back of the main sign body (10), the cleaning component (50) is used to clean the side wall of the speed limit sign (101).

6. A high-speed speed limit sign switching mechanism according to claim 5, characterized in that, The cleaning assembly (50) includes a wiping component (501) mounted on the support rod (20) and a power component (503). When the external air pump supplies air into the first piston sleeve (303) through the air supply pipe (301) and drives the speed limit sign (101) to move toward the back of the main sign body (10), the power component (503) drives the wiping component (501) to rotate against the side wall of the speed limit sign (101).

7. A high-speed speed limit sign switching mechanism according to claim 6, characterized in that, The wiping component (501) includes a support rod (5011), a flexible wiping strip (5012), and a second piston sleeve (5013). One end of the second piston sleeve (5013) is movably sleeved outside the first piston sleeve (303), and the other end is fixedly connected to the support rod (5011). The support rod (5011) and the second piston sleeve (5013) are perpendicular to each other. The flexible wiping strip (5012) is fixedly disposed on the side wall of the support rod (5011). The power component (503) includes a spiral groove (5031) and a protrusion (5032). The spiral groove (5031) is formed on the outer wall of the first piston sleeve (303), and the protrusion (5032) is fixedly installed on the inner wall of the second piston sleeve (5013). The protrusion (5032) extends into the spiral groove (5031) and slides in cooperation with the spiral groove (5031).

8. A high-speed speed limit sign switching mechanism according to claim 7, characterized in that, The second piston sleeve (5013) is also provided with a second spring (5014). One end of the second spring (5014) is connected to the inner wall of the second piston sleeve (5013), and the other end is connected to the end of the first piston sleeve (303), which is used to provide elastic support for the second piston sleeve (5013).

9. A high-speed speed limit sign switching mechanism according to claim 7, characterized in that, The cleaning component (50) also includes a water supply component (502). When the external air pump supplies air into the first piston sleeve (303) through the air supply pipe (301) and drives the speed limit sign (101) to move toward the back of the main sign body (10), the water supply component (502) is used to supply water to the side wall of the speed limit sign (101).

10. A high-speed speed limit sign switching mechanism according to claim 9, characterized in that, A flexible water inlet pipe (5015) is provided on the side wall of the second piston sleeve (5013). The end of the flexible water inlet pipe (5015) away from the second piston sleeve (5013) is connected to an external water tank. The external water tank is fixedly installed on the support rod (20) or placed near the road edge of the support rod (20). The water supply component (502) includes a water supply strip (5021). The water supply strip (5021) is fixedly installed on the outer wall of the second piston sleeve (5013). The water supply strip (5021) is perpendicular to the second piston sleeve (5013). The water supply strip (5021) has a water supply channel (5023) that communicates with the inner cavity of the second piston sleeve (5013). The side wall of the water supply strip (5021) is provided with several spray holes (5022). The flexible water inlet pipe (5015) and the water supply channel (5023) are both provided with one-way valves. The second piston sleeve (5013) contains a water source.

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