CN217601284U - Height limiting device - Google Patents

Abstract

The embodiment of the application provides a height limiting device, and belongs to the technical field of buildings. The height limiting device is used for being assembled on a steel box girder ramp bridge and comprises a mounting seat and a height limiting unit, the height limiting unit is arranged on the mounting seat and is provided with a first threshold value used for limiting the maximum height of a vehicle, and when the height of the vehicle is larger than the first threshold value, the height limiting unit sends an alarm signal; wherein, be equipped with the altitude mixture control subassembly on the mount pad, the altitude mixture control subassembly is used for adjusting limit for height unit first direction's position on the mount pad to make limit for height unit's first threshold value adjustable, the direction of height syntropy of first direction and mount pad. The height limiting device can improve the use flexibility of the height limiting device.

Description

Height limiting device

Technical Field

The application relates to the technical field of building construction, in particular to a height limiting device.

Background

At present, most of the existing height limiting devices adopt a height limiting portal frame type, and the road traffic safety is guaranteed by limiting the passing height of highways, ramps, culverts, bridges and the like. However, in the case of passing of construction vehicles under a steel box girder ramp bridge during construction, no very normal height limiting measure is generally adopted, and particularly for ramp bridges with low clear heights, a mechanical arm of an excavator in construction operation easily touches a box girder, scratches or damages are caused to a bottom plate of the box girder, and construction quality is influenced. Because the ground of construction site is mostly the rubble mud, the place unevenness if adopt conventional limit for height frame to carry out the limit for height, has the construction difficulty and uses inconvenient problem.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a height limiting device and excavator tamping equipment, and can improve the use flexibility of the height limiting device.

The embodiment of the application provides a height limiting device, which is used for being assembled on a steel box girder ramp bridge and comprises a mounting seat and a height limiting unit, wherein the height limiting unit is arranged on the mounting seat and is provided with a first threshold value for limiting the maximum height of a vehicle, and when the height of the vehicle is greater than the first threshold value, the height limiting unit sends an alarm signal; wherein, be equipped with the altitude mixture control subassembly on the mount pad, the altitude mixture control subassembly is used for adjusting limit for height unit first direction's position on the mount pad to make limit for height unit's first threshold value adjustable, the direction of height syntropy of first direction and mount pad.

In this scheme, can install the limit for height device on steel box girder ramp bridge through the mount pad, then utilize limit for height unit on the mount pad alright with be under construction or the automobile body height of coming and going vehicle to steel box girder ramp bridge below, thereby carry out the limit for height to the automobile body height, and after the arm at vehicle height or excavator exceeded first threshold value, limit for height unit can send alarm signal, thereby warn the driver, thereby correspondingly reduced equipment such as vehicle or excavator touches the box girder and causes the probability that the phenomenon of scratch or damage takes place to the box girder. Be provided with the altitude mixture control subassembly through the mount pad, can adjust the position of limit for height unit at the mount pad to make limit for height unit adjustable to the limit value (first threshold value) of automobile body height, make the limit for height device can be applicable to and use under the different situation, can be according to actual conditions, thereby adjust the position of limit for height unit, the corresponding limit value of having adjusted automobile body height, use more in a flexible way.

In some embodiments, the height adjusting assembly comprises a screw rod, a moving seat and a first driving piece, the screw rod is rotatably arranged on the mounting seat, and the screw rod extends along a first direction; the movable seat is arranged on the screw rod and is in threaded fit with the screw rod, the movable seat is in sliding fit with the mounting seat, and the height limiting unit is arranged on the movable seat; the first driving piece is arranged on the mounting seat and used for driving the screw rod to rotate along the axis direction of the screw rod so as to drive the moving seat to move on the screw rod along the first direction.

Among the above-mentioned technical scheme, utilize screw-nut pair mechanism to adjust the position of limit for height unit, will limit for height the unit and install on removing the seat, under the driving action of first driving piece, can make and remove the seat and remove along the extending direction of lead screw to make the position of limit for height unit automatically regulated, and adopt screw-nut pair mechanism drive to remove the seat and remove, the lead screw has certain guide effect, makes the removal precision of removing the seat higher. And adopt first driving piece drive lead screw to rotate to can the automatically regulated limit for height unit's position, do not need artificial participation, degree of automation is higher.

In some embodiments, the mounting seat is provided with a mounting groove, the mounting groove extends along a first direction, and the screw rod is rotatably arranged in the mounting groove.

Among the above-mentioned technical scheme, through setting up the lead screw in the mounting groove, the lead screw can be held to the mounting groove to play certain limiting displacement to the circumference of lead screw, thereby make the rotation of lead screw more stable.

In some embodiments, the height limiting unit comprises a detection element, a controller and an alarm, the detection element is arranged on the movable seat, and the detection element is used for emitting infrared rays to detect the height of the vehicle; the controller is arranged on the movable seat, electrically connected with the detection element and used for sending out an alarm signal when the detection element detects that the height of the vehicle is equal to or greater than a first threshold value; the alarm is arranged on the movable seat, is electrically connected with the controller and is used for giving an alarm when receiving an alarm signal.

Among the above-mentioned technical scheme, through being provided with controller and alarm on removing the seat, the electricity is connected between detecting element and the controller, the signal that detecting element detected like this can feed back to the controller in real time, when the automobile body height of vehicle equals or is greater than first threshold value, the controller can send alarm signal, alarm signal transmits for the alarm, make the alarm report to the police, thereby warn the driver of vehicle or mechanical equipment that superelevation and remind, the probability that takes place direct collision between mechanical equipment or superelevation vehicle and the case roof beam has been reduced.

In some embodiments, the height limiting device further includes an angle adjusting assembly disposed on the movable base, and the angle adjusting assembly is used for adjusting the angle of the detecting element on the movable base.

In the technical scheme, the direction of the infrared rays emitted by the detection element determines the detection accuracy of the height of the vehicle body, so that when the road surface has a certain inclination or the mounting surface of the box girder is uneven, the angle of the infrared rays emitted by the detection element needs to be adjusted to be parallel to the road surface, and the detection accuracy of the detection element is ensured. Consequently through being provided with angle adjusting assembly on removing the seat, can adjust the angle of detecting element through angle adjusting assembly to make detecting element can be more accurate monitor the vehicle height.

In some embodiments, the angle adjusting assembly includes a rotating rod rotatably disposed on the movable base, the rotating rod extending in a second direction perpendicular to the first direction; the rotating part is arranged on the rotating rod and can rotate along with the rotating rod, and the detection element is arranged on the rotating part; the second driving part is arranged on the moving seat and used for driving the rotating rod to rotate so as to drive the detection element to rotate and adjust the angle of the detection element on the moving seat.

Among the above-mentioned technical scheme, through installing detecting element on rotating the piece, rotate the piece and rotate along with the dwang, under the effect of second driving piece, can drive the dwang and rotate to adjust detecting element's installation angle, make detecting element's angularly adjustable, let detecting element can be more accurate monitor the limit for height to the vehicle.

In some embodiments, a telescopic rod is further disposed between the rotating member and the detecting element, the detecting element is disposed at an end of the telescopic rod away from the rotating member, and the telescopic rod is used for adjusting a distance between the detecting element and the movable base.

Among the above-mentioned technical scheme, through be provided with the telescopic link on rotating the piece, the telescopic link can be adjusted and add the detecting element and remove the distance between the seat for the detecting element can adjust the detecting element and remove the distance between the seat according to actual conditions, thereby better satisfies the measuring demand of detecting element.

In some embodiments, the side of the mounting seat away from the height limiting unit is provided with a mounting part, and the mounting part is used for detachably mounting the mounting seat on the steel box girder ramp bridge.

Among the above-mentioned technical scheme, through be provided with the installation department on the mount pad, utilize the installation department can make and can dismantle the connection between mount pad and the steel box girder ramp bridge, be convenient for limit for height device's installing and removing.

In some embodiments, the mounting portion is configured as a magnetic element for providing a magnetic force to magnetically fix the mounting seat to the steel box girder ramp bridge.

Among the above-mentioned technical scheme, through setting up the mount pad into magnetism and inhale the component to make the limit for height device need not rely on limit for height frame, can directly install the limit for height device in the optional position of steel box girder ramp bridge, make limit for height device simple to operate, low cost when the limit for height device need be taken off, only need cancel magnetic force or overcome the magnetic force of magnetism and inhale the component, just can take off the limit for height device, install and remove the convenience.

In some embodiments, the height limiting device further comprises a solar module, and the solar module is arranged on the movable base.

Among the above-mentioned technical scheme, through being provided with solar energy component on removing the seat, solar energy component can provide the electric energy for the use of limit for height device with the help of solar energy, ensures that the limit for height device normally works.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a height limiting device according to some embodiments of the present disclosure;

FIG. 2 is a side view of a height limiter provided in accordance with some embodiments of the present application;

FIG. 3 is a schematic view of a movable base of the height limiting device of FIG. 1;

fig. 4 is a schematic structural view of the rotating member in fig. 3.

An icon: 10-a mounting seat; 11-mounting grooves; 20-a height limiting unit; 21-a detection element; 22-an alarm; 23-a camera; 30-a height adjustment assembly; 31-a first drive member; 32-a screw rod; 33-a mobile seat; 330-a containing groove; 331-a slider; 40-rotating the rod; 41-a second driving member; 42-a rotating member; 420-fixing holes; 43-telescopic rods; 50-a mounting portion; 60-a solar panel; 61-a support bar; x-a first direction; y-a second direction; 100-height limiting device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is further noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

Referring to fig. 1 and 2, a height limiting device 100 is used for being assembled on a steel box girder ramp bridge, the height limiting device 100 includes an installation seat 10 and a height limiting unit 20, the height limiting unit 20 is arranged on the installation seat 10, the height limiting unit 20 has a first threshold value for limiting the maximum height of a vehicle, and when the height of the vehicle is greater than the first threshold value, the height limiting unit 20 sends an alarm signal; the height adjusting assembly 30 is arranged on the mounting base 10, and the height adjusting assembly 30 is used for adjusting the position of the height limiting unit 20 on the mounting base 10 in the first direction X, so that the first threshold of the height limiting unit 20 is adjustable, and the first direction X is in the same direction as the height direction of the mounting base 10.

In this scheme, can install limit for height device 100 on steel box girder ramp bridge through mount pad 10, then utilize limit for height unit 20 on mount pad 10 alright with be under construction or the automobile body height of coming and going vehicle to steel box girder ramp bridge below, thereby carry out the limit for height to the automobile body height, and after vehicle height or the arm of excavator exceeded first threshold value, limit for height unit 20 can send alarm signal, thereby warn the driver, thereby correspondingly reduced equipment such as vehicle or excavator touches the box girder thereby cause the probability that the phenomenon of scratch or damage takes place to the box girder. Height adjusting assembly 30 is arranged on mounting seat 10, and height limiting unit 20 can be adjusted at the position of mounting seat 10, so that height limiting unit 20 is adjustable for limiting value (first threshold value) of vehicle height, and the height limiting device can be applied to different conditions for use, and can be used according to actual conditions, so that the position of height limiting unit 20 is adjusted, the limiting value of vehicle height is correspondingly adjusted, and the use is more flexible.

The position of the height limiting unit 20 on the mounting base 10 can be adjusted in various ways, for example, an electronic push rod, a linear air cylinder or a way of manually pushing the height limiting unit 20 can be adopted, so that the height limiting unit 20 moves on the mounting base 10 to adjust the position of the height limiting unit 20, and of course, a screw-nut pair mechanism can also be adopted to adjust the position of the height limiting unit 20.

In some embodiments, referring to fig. 1, the height adjustment assembly 30 includes a screw 32, a movable base 33 and a first driving member 31, the screw 32 is rotatably mounted on the mounting base 10, and the screw 32 extends along a first direction X; the movable seat 33 is arranged on the screw rod 32 and is in threaded fit with the screw rod 32, the movable seat 33 is in sliding fit with the mounting seat 10, and the height limiting unit 20 is arranged on the movable seat 33; the first driving member 31 is disposed on the mounting base 10, and the first driving member 31 is used for driving the screw rod 32 to rotate along its own axis direction, so as to drive the moving base 33 to move on the screw rod 32 along the first direction X.

The position of the height limiting unit 20 is adjusted by the screw-nut pair mechanism, the height limiting unit 20 is installed on the movable seat 33, the movable seat 33 can move along the extending direction of the screw rod 32 under the driving action of the first driving piece 31, so that the position of the height limiting unit 20 can be automatically adjusted, the movable seat 33 is driven to move by the screw-nut pair mechanism, the screw rod 32 has a certain guiding effect, and the moving precision of the movable seat 33 is higher. And adopt first driving piece 31 drive lead screw 32 to rotate to can the automatic adjustment limit for height unit 20's position, need not artificial participation, degree of automation is higher.

In some embodiments, the mounting seat 10 defines a mounting groove 11, the mounting groove 11 extends along a first direction X, and the screw rod 32 is rotatably disposed in the mounting groove 11.

Through setting up the lead screw 32 in mounting groove 11, mounting groove 11 can hold lead screw 32 to play certain limiting displacement to the circumference of lead screw 32, thereby make the rotation of lead screw 32 more stable.

The mounting groove 11 is provided with a bearing at an end far away from the first driving member 31, and the bearing can be used for rotatably matching a corresponding end of the screw rod 32. In addition, guide portions may be disposed on two sides of the mounting groove 11, and the guide portions may guide the movement of the movable seat 33, so as to guide the movable seat 33 to move on the mounting seat 10 along the first direction X, so that the movable seat 33 and the mounting seat 10 are in sliding fit, and the movement of the movable seat 33 on the mounting seat 10 is more stable. The guide portion may be a guide rail or a guide groove, and the movable base 33 is correspondingly provided with a sliding block 331, and the sliding block 331 can slide on the guide rail or the guide groove.

In some embodiments, the height limiting unit 20 comprises a detecting element 21, a controller and an alarm 22, the detecting element 21 is disposed on the movable seat 33, and the detecting element 21 is used for emitting infrared rays to detect the height of the vehicle; the controller is arranged on the movable seat 33, electrically connected with the detection element 21 and used for sending out an alarm signal when the detection element 21 detects that the height of the vehicle is equal to or greater than a first threshold value; the alarm 22 is arranged on the movable seat 33, the alarm 22 is electrically connected with the controller, and the alarm 22 is used for giving an alarm when receiving an alarm signal.

Through being provided with controller and alarm 22 on removing seat 33, be connected electrically between detecting element 21 and the controller, the signal that detecting element 21 detected like this can feed back to the controller in real time, when the automobile body height of vehicle equals or is greater than first threshold value, the controller can send alarm signal, alarm signal transmits alarm 22 for alarm 22 gives an alarm, thereby warn the driver of vehicle or mechanical equipment that superelevation and remind, the probability that takes place direct collision between mechanical equipment or superelevation vehicle and the case roof beam has been reduced.

The detection element 21 can be an infrared sensor, the infrared sensor emits infrared rays, the height of the infrared rays is a first threshold, and when the height of the body of the excavator or the vehicle is lower than the infrared rays, the controller does not give an instruction. When the maximum height of the body of the excavator or the vehicle is equal to or higher than the infrared ray, the infrared ray is blocked by the body, the infrared sensor feeds back a signal to the controller, the controller sends out an alarm signal, and the alarm 22 is controlled to give an alarm to prompt a driver. The alarm 22 may be a speaker, and the speaker alarm may be a voice reporting "please notice" or a voice reporting "drip" or the like. In addition, the height limiting unit 20 may further include a camera 23, the camera 23 is disposed on the movable seat 33, and the camera 23 may continue to record and take pictures of the vehicle or mechanical equipment with an ultrahigh height, so as to store video data.

In some embodiments, the height limiting device 100 further includes an angle adjusting assembly disposed on the movable base 33, and the angle adjusting assembly is used for adjusting the angle of the detecting element 21 on the movable base 33.

Since the direction of the infrared rays emitted by the detecting element 21 determines the accuracy of detecting the height of the vehicle body, when the road surface has a certain inclination or the mounting surface of the box girder is uneven, the angle of the infrared rays emitted by the detecting element 21 needs to be adjusted to be parallel to the road surface, thereby ensuring the detection accuracy of the detecting element 21. Therefore, by providing the angle adjusting assembly on the movable seat 33, the angle of the detecting element 21 can be adjusted by the angle adjusting assembly, so that the detecting element 21 can monitor the height of the vehicle more accurately.

In some embodiments, referring to fig. 3, the angle adjustment assembly includes a rotating rod 40, a rotating part 42 and a second driving part 41, the rotating rod 40 is rotatably disposed on the movable base 33, the rotating rod 40 extends along a second direction Y, and the second direction Y is perpendicular to the first direction X; the rotating part 42 is arranged on the rotating rod 40 and can rotate along with the rotating rod 40, and the detection element 21 is arranged on the rotating part 42; the second driving member 41 is disposed on the movable seat 33, and the second driving member 41 is used for driving the rotating rod 40 to rotate so as to drive the detecting element 21 to rotate, so as to adjust the angle of the detecting element 21 on the movable seat 33.

Through installing detecting element 21 on a rotation piece 42, rotation piece 42 rotates along with dwang 40, under the effect of second driving piece 41, can drive dwang 40 and rotate to adjust detecting element 21's installation angle, make detecting element 21's angularly adjustable, let detecting element 21 can be more accurate monitor the limit for height to the vehicle.

The movable base 33 may have a receiving groove 330, and the second driving element 41 and the rotating rod 40 are disposed in the receiving groove 330. The first driving member 31 and the second driving member 41 may be driving motors, and output ends of the driving motors are in driving connection with the screw rod 32 or the rotating rod 40. Referring to fig. 4, the rotating member 42 is formed with a fixing hole 420, and the rotating member 40 is disposed through the fixing hole 420, so that the rotating member 42 is fixed on the rotating member 40.

In some embodiments, a telescopic rod 43 is further disposed between the rotating member 42 and the detecting element 21, the detecting element 21 is disposed at an end of the telescopic rod 43 away from the rotating member 42, and the telescopic rod 43 is used for adjusting a distance between the detecting element 21 and the moving base 33. By arranging the telescopic rod 43 on the rotating member 42, the telescopic rod 43 can adjust the distance between the detecting element 21 and the moving seat 33, so that the detecting element 21 can adjust the distance between the detecting element 21 and the moving seat 33 according to actual conditions, and the measuring requirement of the detecting element 21 can be better met.

In some embodiments, a side of the mounting seat 10 facing away from the height limiting unit 20 is provided with a mounting portion 50, and the mounting portion 50 is used for detachably mounting the mounting seat 10 on the steel box girder ramp bridge. By arranging the installation part 50 on the installation seat 10, the installation seat 10 can be detachably connected with the ramp bridge of the steel box girder by using the installation part 50, so that the assembly and disassembly of the height limiting device are facilitated.

The mounting portion 50 may be of various structures, for example, the mounting portion 50 may be a pasting portion, so that the mounting seat 10 is pasted on the steel box girder ramp bridge, and of course, the mounting portion 50 may also be of other structures, for example, a magnet, and the mounting seat 10 is magnetically attracted to the steel box girder ramp bridge by the magnet.

In some embodiments, the mounting portion 50 is configured as a magnetically attractive element for providing a magnetic force to magnetically secure the mounting base 10 to the steel box girder ramp bridge. Through setting up mount pad 10 to magnetism and inhale the component to make limit for height device need not rely on limit for height frame, can directly install limit for height device in the optional position of steel box girder ramp bridge, make limit for height device simple to operate, low cost when the limit for height device need be taken off, only need cancel magnetic force or overcome the magnetic force of magnetism and inhale the component, just can take off limit for height device, install and remove the convenience.

Wherein, the magnetic attraction component can be an electromagnet or a permanent magnet. When the magnetic attraction element adopts an electromagnet, the magnetic attraction element can generate magnetic force by electrifying, so that the mounting seat 10 is fixed on the steel box girder ramp bridge in a magnetic attraction way. When the mounting base 10 needs to be removed, the mounting base 10 can be removed only by powering off the magnetic attraction element. In this embodiment, the magnetic element is a permanent magnet, which has low cost, simple structure and convenient assembly and disassembly.

In some embodiments, the height limiting device further includes a solar module, and the solar module is disposed on the movable base 33. By arranging the solar module on the movable seat 33, the solar module can provide electric energy for the height limiting device by means of solar energy, and the normal operation of the height limiting device is ensured.

Wherein, the solar module can include a solar panel 60 and a storage battery, when the solar energy is sufficient, the solar panel 60 converts the solar energy into electric energy, and the electric energy is used as a main power supply of the height limiting device, and the redundant electric energy is stored in the storage battery. When solar energy is insufficient or at night, electric energy in the storage battery provides a power supply for the height limiting device, and the electric energy requirement of the height limiting device is met. Solar cell panel 60 can set up on removing seat 33 through bracing piece 61, and bracing piece 61 can be so that solar cell panel 60 is certain inclination and sets up, the better absorption solar energy of solar cell panel 60 of being convenient for.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A height limiting device for assembling on a steel box girder ramp bridge, comprising:

a mounting seat;

the height limiting unit is arranged on the mounting seat, is provided with a first threshold value used for limiting the maximum height of a vehicle, and sends out an alarm signal when the height of the vehicle is greater than the first threshold value;

the height adjusting assembly is arranged on the mounting seat and used for adjusting the position of the height limiting unit in a first direction on the mounting seat, so that the first threshold of the height limiting unit is adjustable, and the first direction is in the same direction as the height direction of the mounting seat.

2. The height limiter apparatus of claim 1, wherein the height adjustment assembly comprises:

the screw rod is rotatably arranged on the mounting seat and extends along the first direction;

the moving seat is arranged on the screw rod and is in threaded fit with the screw rod, the moving seat is in sliding fit with the mounting seat, and the height limiting unit is arranged on the moving seat;

the first driving piece is arranged on the mounting seat and used for driving the screw rod to rotate along the axis direction of the screw rod, so that the movable seat is driven to move on the screw rod along the first direction.

3. The height limiting device of claim 2, wherein the mounting seat defines a mounting groove extending along the first direction, and the screw rod is rotatably disposed in the mounting groove.

4. The height limiting device according to claim 2, wherein the height limiting unit comprises:

the detection element is arranged on the movable seat and used for emitting infrared rays to detect the height of the vehicle;

the controller is arranged on the movable seat, electrically connected with the detection element and used for sending the alarm signal when the detection element detects that the height of the vehicle is equal to or greater than the first threshold value;

the alarm is arranged on the movable seat and electrically connected with the controller, and the alarm is used for giving an alarm when receiving the alarm signal.

5. The height limiting device of claim 4, further comprising:

the angle adjusting assembly is arranged on the moving seat and used for adjusting the angle of the detection element on the moving seat.

6. The height limiting device of claim 5, wherein the angular adjustment assembly comprises:

the rotating rod is rotatably arranged on the moving seat and extends along a second direction, and the second direction is perpendicular to the first direction;

the rotating part is arranged on the rotating rod and can rotate along with the rotating rod, and the detection element is arranged on the rotating part;

the second driving part is arranged on the moving seat and used for driving the rotating rod to rotate so as to drive the detection element to rotate, so that the angle of the detection element on the moving seat can be adjusted.

7. The height limiting device according to claim 6, wherein a telescopic rod is further disposed between the rotating member and the detecting element, the detecting element is disposed at an end of the telescopic rod away from the rotating member, and the telescopic rod is used for adjusting a distance between the detecting element and the movable base.

8. The height limiting device of claim 1, wherein a side of the mounting seat facing away from the height limiting unit is provided with a mounting portion for detachably mounting the mounting seat on a steel box girder ramp bridge.

9. The height limiting device of claim 8, wherein the mounting portion is configured as a magnetic element for providing a magnetic force to magnetically fix the mounting seat to the steel box girder ramp bridge.

10. The height limiting device of claim 2, further comprising a solar module disposed on the movable base.

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