CN112900311B - Road and bridge security protection limit for height device - Google Patents
Road and bridge security protection limit for height device Download PDFInfo
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- CN112900311B CN112900311B CN202110116738.4A CN202110116738A CN112900311B CN 112900311 B CN112900311 B CN 112900311B CN 202110116738 A CN202110116738 A CN 202110116738A CN 112900311 B CN112900311 B CN 112900311B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F13/00—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions
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Abstract
The invention provides a road and bridge security and protection height limiting device which comprises a first security and protection mechanism, a second security and protection mechanism, a first detection switch and a controller, wherein the second security and protection mechanism and the first security and protection mechanism are distributed front and back along the vehicle running direction, the first security and protection mechanism comprises a first security and protection bracket and a first speed reduction mechanism, the first speed reduction mechanism comprises a pressure application frame and a pressure application mechanism, the second security and protection mechanism comprises a lifting mechanism, a movable speed reduction pile and a clamping and positioning mechanism, the lifting mechanism comprises a lifting plate and two groups of lifting mechanisms, the two groups of lifting mechanisms respectively comprise a fixed upright post, a driving motor, a winch and a steel wire rope, and the movable speed reduction pile comprises a triangular pile body, a first buffer spring and a buffer plate. The height limiting device not only has the function of limiting the height, but also can effectively realize the speed reduction of the vehicle once the vehicle collides with the height limiting device, and can protect the vehicle to the maximum extent, thereby avoiding the occurrence of serious consequences.
Description
Technical Field
The invention relates to a road and bridge security and protection height limiting device.
Background
The height limiting frame is a door-shaped frame structure used at the entrance of a bridge or a tunnel, plays a role in protecting the bridge or the tunnel and prevents an ultrahigh vehicle from impacting the bridge or the tunnel to damage the bridge or the tunnel; in addition, the vehicle can also cause personal and property injuries to the vehicle and the driver when the vehicle impacts the bridge and the tunnel. The limit for height among the prior art is connected by the welded form mostly, and limit for height the frame promptly all be fixed connection in the entrance in bridge, tunnel, so, in case take place large truck and limit for height the frame and take place the striking, can lead to the vehicle to take place serious damage, injures vehicle driver and crew member by bus, brings comparatively serious consequence.
Disclosure of Invention
The invention aims to provide a road and bridge security and protection height limiting device which not only has the function of limiting the height, but also can effectively realize the deceleration of a vehicle and the protection of the vehicle to the maximum extent when the vehicle collides with the height limiting device once, so that the occurrence of serious consequences can be avoided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a road and bridge security protection height limiting device comprises a first security protection mechanism, a second security protection mechanism, a first detection switch and a controller, wherein the second security protection mechanism and the first security protection mechanism are distributed along the front and back of the vehicle running direction, the first security protection mechanism comprises a first security protection bracket and a first speed reduction mechanism, the first security protection bracket stretches across and is arranged on a road, a first supporting shaft and a first supporting plate are respectively arranged on the front side and the back side in the first security protection bracket, the first speed reduction mechanism comprises a pressure applying frame and a pressure applying mechanism, the pressure applying frame comprises an upper force applying rod and a lower force applying rod, a plurality of force transfer rods are arranged between the upper force applying rod and the lower force applying rod, the force transfer rods are hinged on the first supporting shaft, the safety height allowing the vehicle to pass is arranged below the lower force applying rod, a first limiting plate used for limiting the backward swinging of the force transfer rods is arranged on the back side of the lower portion of the first supporting shaft, the pressing mechanism always applies a forward thrust to the upper forcing rod;
the second security mechanism comprises a lifting mechanism, a movable speed reducing pile and a clamping and positioning mechanism, the lifting mechanism comprises a lifting plate and two groups of lifting mechanisms, the two groups of lifting mechanisms respectively comprise fixed stand columns, a driving motor, a winch and a steel wire rope, the fixed stand columns are oppositely and fixedly arranged on the two sides of a road left and right, the driving motor and the winch are arranged on the upper portions of the corresponding fixed stand columns, the driving motor can drive the winch to rotate, the upper end of the steel wire rope is fixedly connected with the winch, a foundation pit is arranged on the road between the two fixed stand columns, the lifting plate can be placed in the foundation pit, the lower portion of the steel wire rope is fixedly connected with the two ends of the lifting plate, the movable speed reducing pile comprises a triangular pile body, a first buffer spring and a buffer plate, the triangular pile body is placed on the lifting plate, and a plurality of first guide rods are arranged on the front side of the buffer plate, the first guide rods are sleeved on the rear side wall of the triangular pile body and can freely slide relative to the triangular pile body, each first guide rod is sleeved with one first buffer spring which always applies thrust to the buffer plate, a conical positioning block is fixedly arranged on the steel wire rope, each fixed upright post is provided with a clamping and positioning mechanism corresponding to the steel wire rope, after the conical positioning block is clamped on the clamping and positioning mechanism, the upper plane of the lifting plate is just level with the road surface of a road, a cover plate is arranged above the foundation pit, and the rear end of the cover plate is hinged on the road surface;
first detection switch is fixed to be set up first supporting shaft top, and first detection switch is used for detecting the initial position of last application of force pole, first detection switch and driving motor with controller electric connection.
Preferably, the pressure mechanism comprises a pressure plate, a pressure spring and an annular pressure air bag, a plurality of second guide rods are arranged on the rear side wall of the pressure plate, the second guide rods are sleeved on the first supporting plate and can freely slide relative to the first supporting plate, the pressure spring and the annular pressure air bag are sequentially sleeved on the second guide rods from inside to outside, and the pressure spring and the annular pressure air bag always apply a thrust to the pressure plate.
Furthermore, a plurality of buffer rollers positioned at two sides of the dowel bar are arranged on the lower force applying bar.
Furthermore, the rear side wall of the buffer plate is a smooth surface, and anti-skid grains are arranged on the bottom plane of the triangular pile body.
Furthermore, the left side and the right side of the foundation pit are provided with fourth guide rods for lifting and guiding the lifting plate, and the upper parts of the fourth guide rods are lower than the road surface.
Further, the distance from the center of the upper force applying rod to the rotation center of the dowel rod is L1, the distance from the center of the lower force applying rod to the rotation center of the dowel rod is L2, and the ratio of L1 to L2 is 2:1 or 3:1 or 4: 1.
Furthermore, the clamping and positioning mechanism comprises clamping plates and pushing springs, the two clamping plates are oppositely arranged on an L-shaped supporting plate arranged on the fixed stand column through third guide rods on the two clamping plates, the pushing springs are sleeved on the third guide rods, the two clamping plates are butted together through the pushing action of the pushing springs, half conical grooves are formed in the opposite edges of the lower portions of the two clamping plates, and the half conical grooves are matched with conical bodies on the upper portions of the conical positioning blocks.
Furthermore, a shifting rod is fixedly arranged on the steel wire rope, a travel switch matched with the shifting rod is arranged on the corresponding fixed upright post, and after the bottom of the conical positioning block moves to the position above the two clamping plates, the shifting rod can just push an actuating mechanism of the travel switch to realize the power-off operation of the driving motor.
The invention has the beneficial effects that: the invention has simple structure and stable and reliable operation; when the ultrahigh part of the vehicle collides with the buffer roller, the buffer roller swings under the pushing of the vehicle along with the continuous operation of the vehicle and swings to the upper part of the vehicle, and when the buffer roller swings, the pressing mechanism applies reverse thrust to the buffer roller, so that the buffer roller applies pressure to the vehicle, the pressure borne by the vehicle is increased, the friction force borne by the vehicle during running is increased, the vehicle is favorably stopped, the vehicle is favorably protected, further, the pressing mechanism applies pressure to the vehicle through the buffer roller by a lever principle, the pressure amplification is favorably realized, the pressure borne by the vehicle is favorably increased, and the vehicle is favorably stopped quickly; when the buffer roller swings, the controller can start the driving motor at the first time, under the rotation of the driving motor, the cover plate above the foundation pit is opened, meanwhile, the movable speed reducing mechanism is exposed from the foundation pit (at the moment, the vehicle does not run to the foundation pit), after the movable speed reducing mechanism is exposed out of the foundation pit, along with the continuous running of the vehicle, the front wheel of the vehicle is contacted with the buffer plate and pushes the triangular pile body to slide on the ground through the buffer plate, and the triangular pile body provides the resistance for the running of the vehicle in the process of sliding on the ground, so that the vehicle can be stopped quickly, and the vehicle can be stopped in a short time by simultaneously stopping the buffer roller and the triangular pile body when the vehicle is ultrahigh, so that the vehicle can be prevented from colliding with a bridge or a tunnel, and meanwhile, the buffer roller exerts acting force on goods, the buffer plate exerts acting force on the vehicle tire, so that damage to the vehicle is reduced to the maximum extent, and the economic benefit of a driver is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are part of the preferred embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall structure of the movement decelerating mechanism;
FIG. 3 is a cross-sectional view of the pressing mechanism;
FIG. 4 is a schematic view of the placement of the movement decelerating mechanism in the foundation pit;
FIG. 5 is a sectional view of the locking positioning mechanism for locking and positioning the tapered positioning block;
FIG. 6 is a schematic view of the mobile reduction gear mechanism in a raised state in the foundation pit;
FIG. 7 is an enlarged view taken at A in FIG. 1;
FIG. 8 is an enlarged view of FIG. 1 at B;
FIG. 9 is an enlarged view at C of FIG. 1;
FIG. 10 is a front view of the pressure applying frame;
in the figure: 1 a first security support, 11 a first support shaft, 12 a first support plate, 21 an upper force applying rod, 22 a lower force applying rod, 221 a buffer roller, 23 a force transferring rod, 31 a pressure applying plate, 311 a second guide rod, 32 an annular pressure applying air bag, 33 a pressure applying spring, 4 a first photoelectric detection switch, 51 a fixed upright post, 511L-shaped support plate, 52 a driving motor, 53 a winch, 54 a steel wire rope, 541 a conical positioning block, 55 a lifting plate, 61 a triangular pile body, 611 a containing cavity, 62 a first buffer spring, 63 a buffer plate, 631 a first guide rod, 632 a positioning plate, 71 a clamping plate, 711 a third guide rod, 712 a semi-conical groove, 72 a pushing spring, 73 a deflector rod, 74 a travel switch, 101 roads, 102 a foundation pit, 103 a cover plate and 104 a fourth guide rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific embodiments and accompanying drawings 1-10, and it is obvious that the described embodiments are only a part of the preferred embodiments of the present invention, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of the invention, and therefore the invention is not limited to the specific embodiments disclosed below.
The invention provides a road and bridge security height limiting device (as shown in figure 1), which comprises a first security mechanism, a second security mechanism, a first detection switch 4 and a controller, wherein the second security mechanism and the first security mechanism are distributed front and back along the vehicle running direction, namely, in the vehicle running process, a vehicle firstly passes through the first security mechanism and then passes through the second security mechanism, the first security mechanism comprises a first security support 1 and a first speed reducing mechanism, the first security support 1 is arranged on a road 101 in a crossing manner, a first support shaft 11 and a first support plate 12 are respectively arranged on the front side and the rear side in the first security support 1, the first speed reducing mechanism comprises a pressure applying frame and a pressure applying mechanism, the pressure applying frame comprises an upper force applying rod 21 and a lower force applying rod 22, a plurality of force transferring rods 23 are arranged between the upper force applying rod 21 and the lower force applying rod 22, the dowel bar 23 is hinged on the first support shaft 11, the safety height allowed by the vehicle is below the lower dowel bar 22, in this embodiment, the distance from the center of the upper dowel bar 21 to the rotation center of the dowel bar 23 is L1, the distance from the center of the lower dowel bar 22 to the rotation center of the dowel bar 23 is L2, the ratio of L1 to L2 is 2:1 or 3:1 or 4:1, the upper dowel bar 21 realizes pressure transmission on the lower dowel bar 22 through a lever principle, a first limiting plate for limiting the backward swinging of the dowel bar 23 is arranged on the rear side of the lower part of the first support shaft 11, the pressing mechanism always applies a forward pushing force to the upper dowel bar 21, and under a normal condition, the pressing mechanism applies a pushing force to the upper dowel bar 21, so that the lower dowel bar 22 has a backward swinging tendency, and under the limiting action of the first limiting plate, in practical application, when the vehicle is ultrahigh, the part of the vehicle ultrahigh pushes the lower stressing rod 22 to swing forwards, when the lower stressing rod 22 swings forwards, the upper stressing rod 21 swings backwards through the lever action of the force transmission rod 23, when the upper stressing rod 21 swings backwards, the pressing mechanism prevents the upper stressing rod 21 from swinging backwards, so that the lower stressing rod 22 blocks the movement of the vehicle, the rapid parking of the vehicle is realized, in order to reduce the damage degree of the lower stressing rod 22 to the part of the vehicle ultrahigh, a plurality of buffer rollers 221 positioned at two sides of the force transmission rod 23 are arranged on the lower stressing rod 22, the buffer rollers 221 can rotate freely, in practical application, when the vehicle continues to run, under the pushing of the vehicle, the buffer rollers 221 swing to the upper part of the vehicle, through the pushing action of the pressing mechanism, the buffer roller 221 continuously applies pressure to the vehicle, so that the friction resistance in the running process of the vehicle is increased, the vehicle is favorably stopped, and the buffer roller 221 can freely rotate, so that the damage degree to the ultrahigh part of the vehicle can be effectively reduced; to effectively increase the pressurizing effect of the lower pressurizing bar 22, the torque ratio of L1 to L2 is set to 3: 1. in this embodiment, the pressing mechanism is specifically implemented as follows: the pressing mechanism comprises a pressing plate 31, a pressing spring 33 and an annular pressing air bag 32, a plurality of second guide rods 311 are arranged on the rear side wall of the pressing plate 31, and the second guide rod 311 is sleeved on the first support plate 12, the second guide rod 311 can freely slide relative to the first support plate 12, the second guide rod 311 is sleeved with the pressure spring 33 and the annular pressure air bag 32 from inside to outside in sequence, the pressing spring 33 and the annular pressing air bag 32 always apply a pushing force to the pressing plate 31, and the pushing force of the pressing spring 33 and the annular pressing air bag 32 is utilized to realize the blocking effect of the pressing plate 31 on the upper forcing rod 21, and further, when the vehicle collides with the buffer roller 221, the compression spring 33 and the annular compression air bag 32 have compressibility, so that the collision of the vehicle with the buffer roller 221 is buffered, and the damage of the vehicle is reduced.
The second security mechanism comprises a lifting mechanism, a movable speed reducing pile and a clamping and positioning mechanism, the lifting mechanism comprises a lifting plate 55 and two groups of lifting mechanisms, the two groups of lifting mechanisms respectively comprise fixed upright posts 51, a driving motor 52, a winch 53 and a steel wire rope 54, the two fixed upright posts 51 are oppositely and fixedly arranged at the left and right sides of the road 101, the driving motor 52 and the winch 53 are arranged at the upper parts of the corresponding fixed upright posts 51, the driving motor 52 can drive the winch 53 to rotate, the upper end of the steel wire rope 54 is fixedly connected with the winch 53, a foundation pit 102 is arranged on the road 101 between the two fixed upright posts 51, the lifting plate 55 can be placed in the foundation pit 102, the lower part of the steel wire rope 54 is fixedly connected with the two ends of the lifting plate 55, the movable speed reducing pile comprises a triangular pile body 61, a first buffer spring 62 and a buffer plate 63, the triangular pile body 61 is placed on the lifting plate 55, a plurality of first guide rods 631 are arranged on the front side of the buffer plate 63, the first guide rods 631 are sleeved on the rear side wall of the triangular pile body 61, and the first guide rods 631 can freely slide relative to the triangular pile body 61, specifically, an accommodating cavity 611 for accommodating the first guide rods 631 is arranged in the triangular pile body 61, a positioning plate 632 is arranged at the lower part of the first guide rods 631, and the first guide rods 631 can be prevented from escaping from the accommodating cavity 611 by the limit of the positioning plate 632; in practical application, the driving motor 52 can pull the movable speed reducing pile out of the foundation pit 102 by using the steel wire rope 54, and the upper plane of the lifting plate 55 is flush with the road surface of the road 101, when the front wheel of the vehicle contacts the buffer plate 63, the front wheel pushes the triangular pile body 61 to slide on the road 101 through the buffer plate 63 along with the continuous running of the vehicle, and when the triangular pile body 61 slides on the road 101, resistance is provided to block the forward running of the vehicle, so that the vehicle can be stopped favorably, when the front wheel of the vehicle contacts the buffer plate 63, the buffer effect of the first buffer spring 62 is utilized to reduce the initial contact blocking strength between the buffer plate 63 and the front wheel, so that the front wheel can be protected favorably, and in order to prevent the front wheel of the vehicle from ascending on the buffer plate 63, here, the rear side wall of the buffer plate 63 is a smooth surface, and meanwhile, in order to improve the sliding resistance of the triangular pile body 61 in the sliding process, anti-skid grains are arranged on the bottom plane of the triangular pile body 61; further, in order to facilitate smooth raising of the lifting plate 55 in the foundation pit 102, fourth guide bars 104 for guiding the lifting plate 55 to be lifted are provided on both left and right sides of the foundation pit 102, and an upper portion of each fourth guide bar 104 is lower than a road surface of the road 101.
A conical positioning block 541 is fixedly arranged on the steel wire rope 54, a clamping and positioning mechanism corresponding to the steel wire rope 54 is arranged on each fixed upright post 51, after the conical positioning block 541 is clamped on the clamping and positioning mechanism, the upper plane of the lifting plate 55 is just level with the road surface of the road 101, a cover plate 103 is arranged above the foundation pit 102, and the rear end of the cover plate 103 is hinged on the road surface of the road 101, in practical application, the cover plate 103 covers the foundation pit 102, so that the normal passing of small vehicles is not influenced by the foundation pit 102, when an ultrahigh vehicle touches the buffer roller 221, the steel wire rope 54 pulls the lifting plate 55 to ascend, so that the triangular pile body 61 and the buffer plate 63 ascend, the cover plate 103 is jacked open in the ascending process of the triangular pile body 61 and the buffer plate 63, and the cover plate 103 finally turns over and lies on the road, without affecting the smooth contact of the vehicle front wheels with the bumper plate 63.
In this embodiment, the specific implementation manner of the locking and positioning mechanism is as follows: the clamping and positioning mechanism comprises clamping plates 71 and pushing springs 72, wherein the two clamping plates 71 are oppositely arranged on an L-shaped supporting plate 511 arranged on the fixed upright post 51 through third guide rods 711 on the two clamping plates, the pushing springs 72 are sleeved on the third guide rods 711, the two clamping plates 71 are butted together through the pushing action of the pushing springs 72, semi-conical grooves 712 are respectively arranged on the opposite edges of the lower parts of the two clamping plates 71, and the semi-conical grooves 712 are matched with conical bodies on the upper parts of the conical positioning blocks 541. Under normal conditions, the conical positioning block 541 is located at a position below the two clamping plates 71, when the steel wire rope 54 moves upwards, the conical positioning block 541 is synchronously driven to move upwards, along with the ascending of the conical positioning block 541, the conical positioning block 541 can push the two clamping plates 71 which are butted together away by using the guiding effect of the semi-conical groove 712, then the conical positioning block 541 continuously moves to the position above the two clamping plates 71, after the lower part of the conical positioning block 541 is separated from the clamping plates 71, the two clamping plates 71 are butted together again under the pushing of the pushing spring 72, and meanwhile, the steel wire rope 54 stops moving. After the tire of the vehicle is pressed on the lifting plate 55, the steel wire rope 54 is subjected to downward pulling force and tends to move downwards, the steel wire rope 54 can be prevented from moving downwards through the clamping action of the clamping plate 71 on the conical positioning block 541, and then the lifting plate 55 can be prevented from moving downwards, so that the tire of the vehicle is prevented from being sunk into the foundation pit 102.
The first detection switch 4 is fixedly arranged above the first supporting shaft 11, the first detection switch 4 is used for detecting the initial position of the upper stress application rod 21, the first detection switch 4 and the driving motor 52 are electrically connected with the controller, when an ultrahigh vehicle collides with the buffer roller 221, the controller is used for controlling the operation of the driving motor 52, so that the positioning and the lifting of the lifting plate 55 can be realized, after the lifting of the lifting plate 55 is stopped, the upper plane of the lifting plate 55 is flush with the road surface of the road 101, in order to further improve the positioning reliability of the lifting plate 55, a shift lever 73 is fixedly arranged on the steel wire rope 54, a travel switch 74 matched with the shift lever 73 is arranged on the corresponding fixed upright post 51, the shift lever 73 is arranged above the clamping plate 71, and the shift lever 73 and the conical positioning block 541 synchronously move upwards along with the ascending of the steel wire rope 54, when the bottom of the tapered positioning block 541 moves above the two clamping plates 71 (at this time, the upper plane of the lifting plate 55 is just flush with the road surface), the shift lever 73 can just push the actuator of the travel switch 74 to achieve the power-off operation of the driving motor 52, thereby ensuring effective clamping of the tapered positioning block 541 and accurate positioning of the lifting plate 55.
The invention provides a process for preventing an ultrahigh vehicle from decelerating and stopping, which comprises the following steps: after the ultrahigh part of the ultrahigh vehicle is contacted with the buffer roller 221, the vehicle pushes the upper stress application rod 21 to swing towards the pressure application plate 31 along with the continuous running of the vehicle, and the pressure application plate 31 is pushed by the annular inflatable air bag 32 and the pressure application spring 33, so that the buffer roller 221 applies a pushing force to the vehicle at the beginning, the running power of the vehicle can be effectively reduced, the rapid stopping of the vehicle is facilitated, the buffer roller 221 swings to the upper part of the vehicle along with the continuous running of the vehicle, and the buffer roller 221 applies a certain pressure to the vehicle, the pressure applied to the vehicle is increased, the running resistance is increased, and the rapid stopping of the vehicle is facilitated; after the upper force application rod 21 swings, the first photoelectric detection switch 4 detects the swing of the upper force application rod 21 (the swing of the upper force application rod 21, which indicates that an ultrahigh vehicle collides with the buffer roller 221), transmits a detection signal to the controller in the first time, and after the controller receives the signal, the controller starts the driving motor 52 in the first time, so that the mobile speed reduction mechanism rises from the foundation pit 102 (after the mobile speed reduction mechanism rises, at this time, the vehicle does not run to the position), after the mobile speed reduction mechanism rises in place, along with the forward movement of the vehicle, the front wheel of the vehicle contacts with the buffer plate 63, the vehicle pushes the triangular pile body 61 to slide on the ground, the triangular pile body 61 blocks the forward movement of the wheel, and then the rapid stop of the vehicle is facilitated.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
While the preferred embodiments and examples of the present invention have been described in detail, it will be apparent to those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (3)
1. A road and bridge security and protection height limiting device is characterized by comprising a first security and protection mechanism, a second security and protection mechanism, a first detection switch and a controller, wherein the second security and protection mechanism and the first security and protection mechanism are distributed along the front and back of the vehicle running direction, the first security and protection mechanism comprises a first security and protection bracket and a first speed reduction mechanism, the first security and protection bracket is arranged on the road in a crossing manner, a first supporting shaft and a first supporting plate are respectively arranged on the front side and the back side in the first security and protection bracket, the first speed reduction mechanism comprises a pressure applying frame and a pressure applying mechanism, the pressure applying frame comprises an upper force applying rod and a lower force applying rod, a plurality of force transfer rods are arranged between the upper force applying rod and the lower force applying rod, the force transfer rods are hinged on the first supporting shaft, the safety height allowing the vehicle to pass through is arranged below the lower force applying rod, a first limiting plate for limiting the backward swinging of the force transfer rods is arranged on the back side of the lower part of the first supporting shaft, the pressing mechanism always applies a forward thrust to the upper forcing rod;
the second security mechanism comprises a lifting mechanism, a movable speed reducing pile and a clamping and positioning mechanism, the lifting mechanism comprises a lifting plate and two groups of lifting mechanisms, the two groups of lifting mechanisms respectively comprise fixed stand columns, a driving motor, a winch and a steel wire rope, the two fixed stand columns are oppositely and fixedly arranged on the two sides of a road, the driving motor and the winch are arranged on the upper portions of the corresponding fixed stand columns, the driving motor can drive the winch to rotate, the upper end of the steel wire rope is fixedly connected with the winch, a foundation pit is arranged on the road between the two fixed stand columns, the lifting plate can be placed in the foundation pit, the lower portion of the steel wire rope is fixedly connected with the two ends of the lifting plate, the movable speed reducing pile comprises a triangular pile body, a first buffer spring and a buffer plate, the triangular pile body is placed on the lifting plate, and a plurality of first guide rods are arranged on the front side of the buffer plate, the first guide rods are sleeved on the rear side wall of the triangular pile body and can freely slide relative to the triangular pile body, each first guide rod is sleeved with one first buffer spring which always applies thrust to the buffer plate, a conical positioning block is fixedly arranged on the steel wire rope, each fixed upright post is provided with a clamping and positioning mechanism corresponding to the steel wire rope, after the conical positioning block is clamped on the clamping and positioning mechanism, the upper plane of the lifting plate is just level with the road surface of a road, a cover plate is arranged above the foundation pit, and the rear end of the cover plate is hinged on the road surface;
the first detection switch is fixedly arranged above the first support shaft, the first detection switch is used for detecting the initial position of the upper stress application rod, and the first detection switch and the driving motor are electrically connected with the controller; the pressure applying mechanism comprises a pressure applying plate, a pressure applying spring and an annular pressure applying air bag, a plurality of second guide rods are arranged on the rear side wall of the pressure applying plate, the second guide rods are sleeved on the first supporting plate and can freely slide relative to the first supporting plate, the pressure applying spring and the annular pressure applying air bag are sequentially sleeved on the second guide rods from inside to outside, and the pressure applying spring and the annular pressure applying air bag always apply a thrust to the pressure applying plate; a plurality of buffer rollers positioned at two sides of the dowel bar are arranged on the lower stress application bar; the distance from the center of the upper force applying rod to the rotation center of the dowel rod is L1, the distance from the center of the lower force applying rod to the rotation center of the dowel rod is L2, and the ratio of L1 to L2 is 2:1 or 3:1 or 4: 1; the clamping and positioning mechanism comprises clamping plates and pushing springs, the two clamping plates are oppositely arranged on an L-shaped supporting plate arranged on the fixed upright post through third guide rods on the two clamping plates, the pushing springs are sleeved on the third guide rods, the two clamping plates are butted together through the pushing action of the pushing springs, half conical grooves are respectively arranged on the opposite edges of the lower parts of the two clamping plates, and the half conical grooves are matched with conical bodies on the upper parts of the conical positioning blocks; and after the bottom of the conical positioning block moves above the two clamping plates, the shifting rod can just push an actuating mechanism of the travel switch to realize the power-off operation of the driving motor.
2. The road and bridge security and protection height limiting device as claimed in claim 1, wherein the rear side wall of the buffer plate is a smooth surface, and anti-slip lines are arranged on the bottom plane of the triangular pile body.
3. The road and bridge security and protection height limiting device as claimed in claim 2, wherein fourth guide rods for lifting and guiding the lifting plate are arranged on the left side and the right side of the foundation pit, and the upper parts of the fourth guide rods are lower than the road surface.
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| CN202110116738.4A CN112900311B (en) | 2021-01-28 | 2021-01-28 | Road and bridge security protection limit for height device |
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| CN202110116738.4A CN112900311B (en) | 2021-01-28 | 2021-01-28 | Road and bridge security protection limit for height device |
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| CN112900311B true CN112900311B (en) | 2022-04-08 |
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| CN113550247A (en) * | 2021-08-03 | 2021-10-26 | 重庆交通职业学院 | Height limiting rod |
| CN114164782B (en) * | 2021-12-17 | 2023-03-21 | 中电建(四川)城市运营管理有限公司 | Automatic toll collection device for expressway |
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