CN115787544A

CN115787544A - Novel road and bridge security protection device

Info

Publication number: CN115787544A
Application number: CN202211588710.1A
Authority: CN
Inventors: 邢俊峰; 高杰; 程晓辉; 姬战明; 王若冰; 刘玉哲; 邢利峰; 项广红; 林晓旭; 王迅杰
Original assignee: Luoyang City Construction Investigation & Design Institute Co ltd
Current assignee: Luoyang City Construction Investigation & Design Institute Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-03-14

Abstract

The invention relates to a security device, in particular to a novel road and bridge security device. The invention aims to provide a novel road and bridge security device which can reduce the loss of a plunger caused by misjudgment of a driver. The invention provides a novel road and bridge security device which comprises two mounting supports, two buffering springs, a mounting frame, a speed reducing motor and a screw rod, wherein the two mounting supports are connected with each other in a sliding mode, the buffering supports are connected between the two mounting supports, the at least one buffering spring is connected between the buffering supports and the mounting supports, the mounting frame is connected between the tops of the two buffering supports, the speed reducing motors are mounted on the left side and the right side of the mounting frame, and the screw rod is connected to an output shaft of the speed reducing motor. When a driver misjudges that a vehicle impacts on the height limiting frame, the buffer spring can buffer the height limiting frame so as to reduce the impact force of the vehicle, reduce the damage degree of the vehicle and the buffer frame and ensure the safety of the driver.

Description

Novel road and bridge security protection device

Technical Field

The invention relates to a security device, in particular to a novel road and bridge security device.

Background

Before the construction of the bridge, the weight of the bridge capable of being loaded is set, after the construction of the bridge is completed, and after the traffic is turned on, it is difficult to control whether the vehicle can travel on the bridge according to the load in order to avoid the vehicle with an excessive load from traveling on the bridge, so that it is limited according to the height of the vehicle whether the vehicle can travel on the bridge, and since the higher the vehicle is, the heavier the vehicle itself is, and in order to avoid the vehicle with an excessive load from traveling on the bridge, height limiting frames are generally provided on both sides of the bridge.

The existing height limiting frame is generally composed of two support rods and a height limiting rod, when the height limiting frame composed of the two support rods is used, a driver can easily judge a blind impact rod due to error, then a vehicle is clamped, the vehicle is damaged, the driving safety of the driver and other people is influenced, the rigidity of the height limiting frame is usually too large, the top of the vehicle is easily damaged when the driver collides, meanwhile, the driver is harmed by the personnel in the vehicle, and certain potential safety hazards are caused.

Disclosure of Invention

In view of this, the invention provides a novel road and bridge security device capable of reducing the loss of the plunger caused by the misjudgment of the driver.

The utility model provides a novel road and bridge security protection device, including the installing support, the buffering support, buffer spring, the installing frame, gear motor, the screw rod, the limit for height frame, controller and supporting mechanism, the installing support is provided with two, slidingly be connected with the buffering support between two installing supports, be connected with at least one buffer spring between buffering support and the installing support, be connected with the installing frame between two buffering support tops, gear motor is all installed to the installing frame both sides, be connected with the screw rod on gear motor's the output shaft, there is the limit for height frame through threaded connection between two screw rods, so that screw rod rotation control limit for height frame goes up and down, the vehicle is when hitting the limit for height frame by mistake, limit for height frame removes, buffer spring plays the cushioning effect this moment, limit for height frame and buffering support sliding fit, supporting mechanism sets up the position that is close to the installing support at the road, supporting mechanism is located road one side, be equipped with the controller on one of them installing support.

More preferably, the supporting mechanism comprises an installation bottom frame, a bearing base, a bearing plate, weighing sensors, air cylinders and a stopping assembly, the installation bottom frame is arranged on the right side of the road, one side of the installation bottom frame is connected with the bearing base, the other side of the installation bottom frame is slidably connected with the bearing plate, one side of the installation bottom frame, which is close to the bearing base, is provided with four weighing sensors, the four weighing sensors are all abutted against the bearing base, the installation bottom frame is provided with at least one air cylinder, the air cylinder is electrically connected with the controller, the weighing sensors detect that the pressure bearing weight of the bearing base exceeds the limited weight and send a signal to the controller, the controller receives the signal to control the air cylinders to start, so that the air cylinders stretch and retract, the telescopic rods of the air cylinders are connected with the bearing plate, the bearing plate is controlled to move through the air cylinders, the stopping assembly is arranged on the installation bottom frame, the stopping assembly is positioned below the bearing plate, the stopping assembly is exposed after the bearing plate moves, and when the vehicle moves to be in contact with the driving wheel of the stopping assembly, the stopping assembly can stop the vehicle.

More preferably, stop the subassembly including conveyer belt and cylinder, even interval rotates on the installation chassis and is connected with two sets of cylinders, and every group cylinder is a plurality of settings, is connected with the conveyer belt between a plurality of cylinders of every group, and the conveyer belt is exposed to the bearing plate after removing, can make its drive wheel and conveyer belt contact after the vehicle removes, and the rotatory drive power of vehicle drive wheel makes the conveyer belt rotatory this moment to make the vehicle drive wheel stop to drive the vehicle and remove.

More preferred is, still including protective assembly, protective assembly is connected with the buffer block including buffer block, anti-light strip and limit for height tablet, limit for height overhead front side for play the cushioning effect, the buffer block front side is connected with anti-light strip, is used for indicateing the limited overhead of driver, and limit for height overhead top is connected with the limit for height tablet.

More preferred, still including warning mechanism, warning mechanism is including the pivot, torque spring, warning lamp plate and extrusion subassembly, limit for height the overhead top and be close to the position rotary type of installation chassis and be connected with the pivot, be connected with torque spring between pivot and the limit for height the overhead, be connected with at least one warning lamp plate in the pivot, warning lamp plate and controller pass through electric connection, weighing sensor detects bearing base compression weight and surpasss to prescribe a limit for weight and send a signal for the controller, the controller detects that signal control warns the lamp plate and lights, be equipped with the extrusion subassembly between bearing base and the pivot, be used for control warning lamp plate to stick up.

More preferably, the extrusion subassembly is including the connecting rod, extrusion frame and shifting block, the bearing plate top is connected with the connecting rod, limit for height frame top slidingtype is connected with the extrusion frame, the position that extrusion frame and connecting rod are close to each other all is connected with magnet, the connecting rod passes through magnet and extrusion frame magnetism cooperation, so that the connecting rod drives the extrusion frame through magnetism and removes when removing, the position that the pivot is close to the extrusion frame is connected with the shifting block, the extrusion frame can support the shifting block, when the extrusion frame supports the shifting block, limit for height tablet does not stand, torque spring is compression state this moment, when the extrusion frame removes to no longer supporting the shifting block, limit for height tablet stands under torque spring's effect, stand with control limit for height tablet.

More preferably, still including buzzing alarm, install buzzing alarm on one of them installing support, buzzing alarm and controller have electric connection, and weighing sensor detects that bearing base pressurized weight surpasss to prescribe a limit to weight and sends a signal for the controller, and the controller detects signal control buzzing alarm and sends out the police dispatch newspaper to it is overweight to indicate the navigating mate.

More preferably, the buffer device further comprises a buffer, and the buffer is arranged at a position of the mounting bracket far away from the buffer bracket so as to play a buffer role when the buffer bracket moves.

The invention has the following advantages: 1. when a driver misjudges that a vehicle impacts on the height limiting frame, the buffer spring can buffer the height limiting frame so as to reduce the impact force of the vehicle, reduce the damage degree of the vehicle and the buffer frame and ensure the safety of the driver.

2. When the vehicle is detected to be overweight, the driving wheel of the vehicle can be contacted with the conveyor belt, so that the driving force of the driving wheel of the vehicle acts on the conveyor belt, and the vehicle is prevented from being continuously driven by the driving wheel of the vehicle to move.

3. When the vehicle is detected to be overweight, the warning lamp panel can be controlled to stand so as to enable the warning lamp panel 95 to stand and prompt a driver that the vehicle is overweight, so that the driver can know in advance that the vehicle is overweight and cannot pass through, and corresponding measures can be taken in time.

Drawings

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

Fig. 2 is a partial perspective view of the present invention.

Fig. 3 is a schematic perspective view of the buffer bracket, the buffer spring, the mounting bracket and other components of the invention.

Fig. 4 is a schematic perspective view of the components of the speed reducing motor, the screw, the height limiting frame and the like.

Fig. 5 is a schematic perspective view of the supporting mechanism of the present invention.

Fig. 6 is a schematic perspective view of another perspective view of the supporting mechanism of the present invention.

Fig. 7 is a schematic view of a first partial body structure of the supporting mechanism of the present invention.

FIG. 8 is a schematic view of a second partial structure of the supporting mechanism of the present invention.

Fig. 9 is a schematic perspective view of the warning mechanism of the present invention.

Fig. 10 is a schematic perspective view of a part of the warning mechanism of the present invention.

Fig. 11 is a schematic perspective view of the connecting rod and the extrusion frame of the present invention.

In the figure: 1_ installing support, 2_ buffering support, 21_ buffering spring, 3_ installing frame, 4_ gear motor, 41_ screw rod, 5_ height limiting frame, 6_ controller, 7_ supporting mechanism, 71_ installing bottom frame, 72_ bearing base, 73_ bearing plate, 74_ weighing sensor, 75_ cylinder, 76_ stop assembly, 761_ conveyer belt, 762_ roller, 8_ protective assembly, 81_ buffer block, 82_ reflective strip, 83_ height limiting plate, 9_ warning mechanism, 91_ connecting rod, 92_ extrusion frame, 921_ dial block, 93_ rotating shaft, 94_ torsion spring, 95_ warning lamp plate, 10_ buzzer alarm, 11_ buffer.

Detailed Description

The present invention will be further described with reference to specific examples, which are intended to illustrate, but not limit the scope of the invention.

Example 1

The utility model provides a novel road and bridge security protection device, as shown in fig. 1-4, including installing support 1, buffer support 2, buffer spring 21, installing frame 3, gear motor 4, screw rod 41, limit for height frame 5, controller 6 and supporting mechanism 7, installing support 1 is provided with two, sliding type connection has buffer support 2 between two installing support 1, buffer support 2 and two installing support 1 all are connected with two buffer spring 21, be connected with installing frame 3 between two buffer support 2 tops, gear motor 4 is all installed to the installing frame 3 left and right sides, be connected with screw rod 41 on the output shaft of gear motor 4, there is limit for height frame 5 through threaded connection between two screw rod 41, so that screw rod 41 rotation control limit for height frame 5 goes up and down, the vehicle is when hitting limit for height frame 5 by mistake, limit for height frame 5 removes, buffer spring 21 plays the cushioning effect this moment, limit for height frame 5 and buffer support 2 sliding fit, supporting mechanism 7 sets up the position that the road is close to installing support 1 at the road, supporting mechanism 7 is located the road right side (in the in-hand use process, the direction of vehicle traveling, the support 7 sets up the left side of the road and sets up the right side of the road traffic control mechanism 7, the traffic mechanism 7 if the road traffic control is provided on the left side of the road, the left side of the road.

As shown in fig. 5-8, the supporting mechanism 7 includes an installation chassis 71, a load-bearing base 72, a load-bearing plate 73, a load-bearing sensor 74, an air cylinder 75 and a stopping component 76, the installation chassis 71 is disposed on the right side of the road, the load-bearing base 72 is connected to the front side of the installation chassis 71, the load-bearing plate 73 is slidably connected to the rear side of the installation chassis 71, four load-bearing sensors 74 are installed on the front side of the installation chassis 71, the load-bearing sensors 74 are electrically connected to the controller 6, the four load-bearing sensors 74 all abut against the load-bearing base 72, two air cylinders 75 are installed on the installation chassis 71, the air cylinders 75 are electrically connected to the controller 6, the load-bearing sensors 74 detect that the weight of the load-bearing base 72 exceeds a limited weight and send a signal to the controller 6, the controller 6 receives the signal to control the actuation of the air cylinders 75 to extend and retract the air cylinders 75, the extendable rods of the air cylinders 75 are connected to the load-bearing plate 73 to control the movement of the load-bearing plate 73, the stopping component 76 is disposed on the installation chassis 71, the stopping component 76 is disposed below the load-bearing plate 73, the stopping component 76 exposes the stopping component 76 after the load-bearing plate 73 moves, and the vehicle, when the vehicle moves to contact the driving wheel, and the vehicle.

As shown in fig. 7 and 8, the stopping assembly 76 includes a conveyor 761 and rollers 762, two sets of rollers 762 are rotatably connected to the rear side of the mounting chassis 71 at regular intervals, each set of rollers 762 is provided in plural, the conveyor 761 is connected between the rollers 762 of each set, the bearing plate 73 exposes the conveyor 761 after moving, the driving wheel of the vehicle is brought into contact with the conveyor 761 after moving, and the driving force of the rotation of the driving wheel of the vehicle rotates the conveyor 761 to stop the driving wheel of the vehicle from moving.

When the bridge is required to be secured, the device can be used, when the device is used, the two mounting brackets 1 are respectively mounted on two sides of a road close to the bridge, the mounting underframe 71 is mounted on the right side of the road in an embedded manner, when a vehicle runs, the vehicle can sequentially move along the bearing base 72 and the bearing plate 73 until the vehicle leaves the device, if a driver judges that the vehicle is too high and the vehicle with the weight exceeding the limited weight drives the bridge, the weighing sensor 74 detects that the weight of the vehicle on the bearing base 72 exceeds the standard, at the moment, the weighing sensor 74 sends a signal to control the expansion rod of the air cylinder 75 to extend through the controller 6, the expansion rod of the air cylinder 75 drives the bearing plate 73 to move so as to expose the conveyor 761, when the driving wheel of the vehicle moves to be in contact with the conveyor 761, the driving wheel of the vehicle drives the conveyor 761 to rotate without driving the vehicle to move, and the vehicle can strike limit for height frame 5 because inertia is in the mobile state, the striking dynamics can make limit for height frame 5 remove backward, buffer spring 21 can play the cushioning effect this moment, thereby make the vehicle stop to move, simultaneously in order to avoid too big vehicle or limit for height frame 5 that lead to of striking dynamics to be impaired, also can avoid the driver to be injured, thereby reduce the loss that leads to because of the wrong card that dashes of navigating mate judgement, if the vehicle card is on limit for height frame 5, can start gear motor 4 drive screw 41 and rotate, in order to drive limit for height frame 5 and shift up, make limit for height frame 5 no longer block in vehicle department, if special vehicles such as fire engine, ambulance need pass through, its weight can not be very heavy, but vehicle height designs again is higher, also can start gear motor 4 drive screw 41 and rotate to drive limit for height frame 5 and move up a section distance, for special vehicles passes through.

Example 2

On the basis of embodiment 1, as shown in fig. 1 and 10, the safety protection device further comprises a protection component 8, the protection component 8 comprises a buffer block 81, a reflective strip 82 and a height limit board 83, the buffer block 81 is connected to the front side of the height limit frame 5 (in this embodiment, the buffer block 81 is made of polyurethane) and is used for playing a role of buffering, the reflective strip 82 is connected to the front side of the buffer block 81 and is used for prompting a driver of the limited height frame 5, and the height limit board 83 is connected to the top of the height limit frame 5.

When the vehicle is in collision, the vehicle can collide on the buffer block 81, so that a buffer effect is further achieved, the height limit board 83 can write the height, and a driver can judge whether the height of the height limit frame 5 and the vehicle can pass through more visually.

As shown in fig. 1, fig. 9, fig. 10 and fig. 11, the device further includes a warning mechanism 9, the warning mechanism 9 includes a rotating shaft 93, a torsion spring 94, a warning lamp panel 95 and a pressing component, the rotating shaft 93 is rotatably connected to the top right side of the height limiting frame 5, the torsion spring 94 is connected between the rotating shaft 93 and the height limiting frame 5, two warning lamp panels 95 are connected to the rotating shaft 93, the warning lamp panels 95 are electrically connected to the controller 6, the weighing sensor 74 detects that the pressed weight of the bearing base 72 exceeds the limited weight and sends a signal to the controller 6, the controller 6 detects that the signal controls the warning lamp panel 95 to light, the pressing component is arranged between the bearing base 72 and the rotating shaft 93, and is used for controlling the erection of the warning lamp panel 95.

As shown in fig. 9-11, the squeezing assembly includes a connecting rod 91, a squeezing frame 92 and a shifting block 921, the connecting rod 91 is connected to the right side of the top of the bearing plate 73, the squeezing frame 92 is slidably connected to the top of the height-limiting frame 5, magnets are connected to positions where the squeezing frame 92 and the connecting rod 91 are close to each other, the connecting rod 91 is magnetically attracted to the squeezing frame 92 through the magnets, so that the squeezing frame 92 is driven to move through magnetic attraction when the connecting rod 91 moves, the shifting block 921 is connected to the right side of the rotating shaft 93, the squeezing frame 92 can abut against the shifting block 921, when the squeezing frame 92 abuts against the shifting block 921, the height-limiting plate 83 is not raised, at this time, the torsion spring 94 is in a compressed state, and when the squeezing frame 92 moves to no longer abut against the shifting block 921, the height-limiting plate 83 is raised under the action of the torsion spring 94, so as to control the height-limiting plate 83 to be raised.

Initially, the extrusion frame 92 supports the shifting block 921, the torsion spring 94 is in a compressed state, the bearing plate 73 moves backwards, the bearing weight on the bearing base 72 is overweight, the warning lamp plate 95 lights at the moment, the bearing plate 73 moves backwards to drive the connecting rod 91 to move backwards, the connecting rod 91 moves backwards to drive the extrusion frame 92 to move backwards through the magnet, the extrusion frame 92 does not support the shifting block 921 any more after moving backwards, at the moment, the rotating shaft 93 rotates under the action of the torsion spring 94 to drive the warning lamp plate 95 to rotate, so that the warning lamp plate 95 stands up, the driver is reminded that the vehicle is overweight, the driver can know in advance that the vehicle is overweight and cannot pass through, corresponding measures can be made in time, if the brake stops, the bearing plate 73 rotates through the extrusion frame 92 to stir the shifting block 921 when resetting, so as to drive the rotating shaft 93 and the warning lamp plate 95 to reset, and the torsion spring 94 compresses again.

As shown in fig. 2, the vehicle-mounted load-bearing device further comprises a buzzer alarm 10, the buzzer alarm 10 is mounted on the front side of the right-side mounting bracket 1, the buzzer alarm 10 is electrically connected with the controller 6, the load cell 74 detects that the pressed weight of the load-bearing base 72 exceeds the limit weight and sends a signal to the controller 6, and the controller 6 detects the signal and controls the buzzer alarm 10 to give an alarm to prompt that the driver is overweight.

As shown in fig. 1 and 2, a buffer 11 is further included, and the buffer 11 is installed at the rear side of the mounting bracket 1 to play a role of buffering when the buffering bracket 2 moves.

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

Claims

1. A novel road and bridge security device is characterized by comprising mounting supports (1), buffer supports (2), buffer springs (21), mounting frames (3), speed reducing motors (4), screw rods (41), height limiting frames (5), a controller (6) and a supporting mechanism (7), wherein the two mounting supports (1) are arranged, the buffer supports (2) are connected between the two mounting supports (1) in a sliding mode, at least one buffer spring (21) is connected between each buffer support (2) and the corresponding mounting support (1), the mounting frames (3) are connected between the tops of the two buffer supports (2), the speed reducing motors (4) are installed on two sides of each mounting frame (3), the screw rods (41) are connected onto output shafts of the speed reducing motors (4), and the height limiting frames (5) are connected between the two screw rods (41) through threads, so that the screw (41) rotates to control the elevation limit frame (5) to lift, when the vehicle mistakenly collides with the elevation limit frame (5), the height limiting frame (5) moves, the buffer spring (21) plays a buffer role at the moment, the height limiting frame (5) is in sliding fit with the buffer bracket (2), the supporting mechanism (7) is arranged at a position of the road close to the mounting bracket (1), the supporting mechanism (7) is positioned at one side of the road, one of the mounting brackets (1) is provided with a controller (6).

2. The novel road and bridge security device as claimed in claim 1, wherein the supporting mechanism (7) comprises an installation chassis (71), a bearing base (72), a bearing plate (73), weighing sensors (74), air cylinders (75) and a stopping component (76), the installation chassis (71) is arranged on one side of the road, the bearing base (72) is connected to one side of the installation chassis (71), the bearing plate (73) is connected to the other side of the installation chassis (71) in a sliding manner, four weighing sensors (74) are installed on one side of the installation chassis (71) close to the bearing base (72), the weighing sensors (74) are electrically connected with the controller (6), the four weighing sensors (74) all abut against the bearing base (72), at least one air cylinder (75) is installed on the installation chassis (71), the air cylinders (75) are electrically connected with the controller (6), the weighing sensors (74) detect that the weight of the bearing base (72) exceeds a limited weight and send signals to the controller (6), the controller (6) receives signals to control the air cylinders (75) to start the air cylinders (75) to enable the air cylinders (75) to stretch, the air cylinders (75) are connected with the bearing plate (73), the telescopic rods (73) to move the supporting assembly (71), the stop assembly (76) is positioned below the bearing plate (73), the stop assembly (76) is exposed after the bearing plate (73) moves, and when the vehicle moves until the driving wheel of the vehicle contacts with the stop assembly (76), the stop assembly (76) can stop the vehicle from moving.

3. The novel road and bridge security device as claimed in claim 2, wherein the stopping assembly (76) comprises a conveyor belt (761) and rollers (762), two groups of rollers (762) are rotatably connected to the mounting chassis (71) at uniform intervals, each group of rollers (762) is provided in a plurality of arrangements, the conveyor belt (761) is connected between the rollers (762) of each group, the conveyor belt (761) is exposed from the bearing plate (73) after the bearing plate is moved, the driving wheel of the vehicle can be in contact with the conveyor belt (761) after the vehicle is moved, and the conveyor belt (761) is rotated by the driving force of the rotation of the driving wheel of the vehicle at the moment, so that the driving wheel of the vehicle stops driving the vehicle to move.

4. The novel road and bridge security device is characterized by further comprising a protective component (8), wherein the protective component (8) comprises a buffer block (81), a reflective strip (82) and a height limiting board (83), the buffer block (81) is connected to the front side of the height limiting frame (5) and used for playing a role of buffering, the reflective strip (82) is connected to the front side of the buffer block (81) and used for prompting a driver of the limited frame (5), and the height limiting board (83) is connected to the top of the height limiting frame (5).

5. The novel road and bridge security device is characterized by further comprising a warning mechanism (9), wherein the warning mechanism (9) comprises a rotating shaft (93), a torsion spring (94), a warning lamp plate (95) and an extrusion assembly, the rotating shaft (93) is rotatably connected to the top of the height limiting frame (5) close to the installation chassis (71), the torsion spring (94) is connected between the rotating shaft (93) and the height limiting frame (5), at least one warning lamp plate (95) is connected to the rotating shaft (93), the warning lamp plate (95) is electrically connected with the controller (6), the weighing sensor (74) detects that the pressed weight of the bearing base (72) exceeds the limited weight and sends a signal to the controller (6), the controller (6) detects that the signal controls the warning lamp plate (95) to light, and the extrusion assembly is arranged between the bearing base (72) and the rotating shaft (93) and used for controlling the warning lamp plate (95) to stand up.

6. The novel road and bridge security device is characterized in that the extrusion assembly comprises a connecting rod (91), an extrusion frame (92) and a shifting block (921), the connecting rod (91) is connected to the top of the bearing plate (73), the extrusion frame (92) is connected to the top of the height limiting frame (5) in a sliding mode, magnets are connected to positions, close to each other, of the extrusion frame (92) and the connecting rod (91), the connecting rod (91) is matched with the extrusion frame (92) in a magnetic attraction mode through the magnets, the extrusion frame (92) is driven to move through the magnetic attraction when moving, the shifting block (921) is connected to a position, close to the extrusion frame (92), of the rotating shaft (93), the shifting block (921) can abut against the extrusion frame (92), when the extrusion frame (92) abuts against the shifting block (921), the height limiting plate (83) does not stand up, the torsion spring (94) is in a compression state, when the extrusion frame (92) does not move to abut against the shifting block (921), the height limiting plate (83) stands up under the action of the torsion spring (94), and the height limiting plate (83) is controlled.

7. The novel road and bridge security device as claimed in claim 2, further comprising a buzzer alarm (10), wherein the buzzer alarm (10) is mounted on one of the mounting brackets (1), the buzzer alarm (10) is electrically connected with the controller (6), the weighing sensor (74) detects that the pressed weight of the bearing base (72) exceeds a limited weight and sends a signal to the controller (6), and the controller (6) detects the signal and controls the buzzer alarm (10) to give an alarm to prompt the driver that the weight is overweight.

8. A novel road and bridge security device as claimed in claim 1, which further comprises a buffer (11), wherein the buffer (11) is installed at a position of the mounting bracket (1) far away from the buffer bracket (2) so as to play a role of buffering when the buffer bracket (2) moves.