Vehicle kinetic energy recovery and passive detection deceleration strip based on friction nanometer generator

Abstract

A vehicle kinetic energy recovery and passive detection deceleration strip based on a friction nanometer generator comprises a left slope section and a right slope section which are symmetrically arranged, the paper-based friction nanometer generator is arranged on the lower portion of a space between the left slope section and the right slope section, a cover plate is sealed on the upper portion of the space, and the paper-based friction nanometer generator is connected with an energy conversion system and a control unit. The upper surface of the right slope section is an inclined plane, a return device is arranged on the left side of a bolt hole of the right slope section, the left end of the cover plate is rotatably connected with the right end of the left slope section, the right end of the cover plate is pressed above the return device, and the left side of the return device is connected with a horizontal pressing plate which is located on the upper surface of the paper-based friction nanometer generator below the cover plate. The cover plate can downwards press the return device to the position below the upper surface of the right slope section under the action of heavy pressure, and due to the design of the novel cover plate and the return device, the cover plate does not integrally descend any more but is changed into single-side height reduction, so that impact on an automobile due to vertical movement of the cover plate can be better relieved when the automobile passes through the cover plate.

Description

Technical Field

[0001] The present invention relates to the technical field of speed or impact measurement of moving objects, and in particular to vehicle kinetic energy recovery and passive detection of speed bumps based on friction nanogenerators. Background Art

[0002] In modern traffic systems, speed bumps are a commonly used traffic management facility to reduce vehicle speeds and improve road safety. Although traditional speed bumps play a certain role in controlling vehicle speeds, they do not have other additional functions, such as energy recovery or vehicle monitoring.

[0003] With the promotion of the concept of sustainable development and the development of intelligent transportation technology, how to effectively utilize the energy in traffic flow and enhance the function of road safety facilities through technical means has become a hot topic of research. Especially in the dense urban traffic environment, if the energy generated by vehicles frequently passing through speed bumps can be recovered, it will bring a new supplementary source to the urban energy system.

[0004] In addition, traditional vehicle detection systems rely on active sensors or require external energy supply, such as radars and cameras, which are often costly and complex to maintain. Therefore, it is particularly important and practical to develop a vehicle detection system that does not require an external power supply and can generate electricity autonomously. By utilizing the pressure and friction when a vehicle passes by, not only can electricity be generated, but data on the vehicle's weight and speed can also be obtained at the same time, which is of great significance for traffic management and planning.

[0005] There are also applications of applying friction nanogenerators to speed bumps in the prior art. For example, the patent number is: CN202411005680.6, and the name is a patent for a self-driven luminous speed bump based on an arched friction nanogenerator. This patent mainly drives the friction nanogenerator to work by deforming and pressing down on an arc-shaped accommodating cavity. However, in this patent, the speed bump is arranged in an arc-shaped span. The weight of the car is large. The speed bump must produce enough deformation to press down, but it must not press down too much to damage other components. The material requirements for the speed bump are extremely high, and the production cost is high.

[0006] The patent number is: CN202110553907.0, and the name is a self-powered speed measurement and deceleration alarm device based on a rotating AC nano-friction generator. It discloses a deceleration cover that can move up and down to drive the friction nano-generator to work. However, the up and down movement of the deceleration cover will inevitably produce a groove at the installation position. When a car passes by, it will have an impact on the car and affect driving. Summary of the invention

[0007] In order to solve the technical problems existing in the above-mentioned background technology and comprehensively consider the economy and driving comfort, the present invention provides a vehicle kinetic energy recovery and passive detection speed bump based on a friction nanogenerator.

[0008] The technical solution of the present invention is as follows:

[0009] The vehicle kinetic energy recovery and passive detection speed bump based on friction nanogenerator includes a symmetrically arranged left slope section and a right slope section. A paper-based friction nanogenerator is arranged at the lower part of the space between the left slope section and the right slope section. The upper part is closed with a cover plate. The upper surface of the cover plate is a plane. The position is changed by a return device, thereby driving the paper-based friction nanogenerator to generate electricity. The left slope section, the right slope section and the cover plate together form a trapezoidal shape with the upper side smaller than the lower side.

[0010] The paper-based friction nanogenerator connects the energy conversion system and the control unit.

[0011] The speed bump of the present invention can be directly fixed on the ground for use without digging grooves. The left slope section and the right slope section provide buffering for the wheels to enter and exit the cover plate. The cover plate changes its position through a return device. When it is in the highest position, it is flush with the tops of the left and right slope sections on both sides. When it is in the lowest position, it compresses the paper-based friction nanogenerator to generate electricity, thereby effectively recovering the kinetic energy generated by the passing vehicle and converting it into electrical energy. It can also realize passive detection of the vehicle speed and weight by analyzing the electrical signals generated thereby.

[0012] The left slope section and the right slope section can be in the shape of a right triangle, which is convenient for making and providing the inclined surface. Bolt holes are respectively opened on the outer surfaces of the inclined surfaces. The vertical cross-section of the bolt holes is in the shape of a right triangle, including a bottom surface and a vertical surface. The bottom surface is connected with a fixing bolt, and the vertical surface is vertically arranged close to the side of the paper-based friction nanogenerator.

[0013] The paper-based friction nanogenerator is a double-helix multilayer structure formed by cross-folding the upper friction layer and the lower friction layer;

[0014] The middle of the upper friction layer is paper, and the two sides are conductive copper tapes, and a polytetrafluoroethylene film is arranged outside the conductive copper tape on each side;

[0015] In the middle of the lower friction layer, there are conductive copper tapes on both sides.

[0016] In order to better mitigate the impact on the car caused by the up and down movement of the cover plate when the car passes over the cover plate, the present invention focuses on designing the following structure.

[0017] The upper surface of the right slope section is an inclined surface, and a return device is arranged on the left side of the bolt hole. The left end of the cover plate is rotatably connected to the right end of the left slope section, and the right end of the cover plate is pressed on the return device. A horizontal pressure plate is connected to the left side of the return device. The pressure plate is located on the upper surface of the paper-based friction nanogenerator under the cover plate. The cover plate can press the return device downward to below the upper surface of the right slope section under heavy pressure. Therefore, without affecting the operation of the paper-based friction nanogenerator, the up and down movement of the cover plate is converted into a rotational movement around a fixed axis, forming a good transition between the left slope section and the right slope section, thereby avoiding the impact caused by the wheel hitting the groove outlet.

[0018] Specifically, the cover plate is a flat plate with an inwardly inclined end surface on the left side. When the cover plate is pressed down to the lowest point, the inclined end surface can be aligned with the vertical surface on the right side of the left slope section to form an integral structure, so that the gravity acting on the cover plate is transferred to the left slope section, without making the cover plate very thick to bear the entire wheel weight, thereby saving costs by optimizing the structure.

[0019] As a preferred solution, a limiting structure is provided at the connection between the left side of the cover plate and the left slope section to limit the angle of upward rotation of the cover plate so that it can switch between the horizontal state and the right end downward movement state.

[0020] The right end of the cover plate is an arc-shaped surface, and is tangent to the right slope section bevel. A wear-resistant cloth is connected between the right end of the cover plate and the right end of the upper plane of the right slope section. The arc-shaped transition allows the wheel to reach the right slope section from the cover plate better to avoid impact. The cover plate and the right slope section are connected by the wear-resistant cloth to prevent debris from entering the gap between the two.

[0021] Preferably, the inclination of the upper surface of the right slope section is the same as the angle between the cover plate and the horizontal plane when the cover plate is pressed down to the lowest point, thereby increasing the contact area between the cover plate and the right slope section when the cover plate is pressed down onto the right slope section.

[0022] An adjustment groove is provided on the left side of the bolt hole of the right slope section, the top of the adjustment groove passes through the upper surface of the right slope section, the bottom surface of the adjustment groove is not lower than the bottom surface of the bolt hole, and is separated from the bolt hole by a sealing plate. A return device is provided in the adjustment groove, and the return device includes:

[0023] A fixing rod, which is vertically fixed at the bottom of the adjusting groove, has threads at the bottom and a top that does not exceed the upper surface of the right slope section;

[0024] The upper pressure cap has its right end buckled on the fixed rod, and its left end extends to the left side of the right slope section, and a pressure plate is connected to the lower part of the left end. A corresponding clearance hole is arranged on the left side of the right slope section on the downward pressure path of the upper pressure cap;

[0025] The support plate is sleeved on the lower part of the fixing rod, and the lower part is supported on the fixing rod through a nut;

[0026] The spring is arranged outside the fixing rod between the upper pressing cap and the supporting plate.

[0027] Preferably, the adjustment groove is a square groove, and the support plate has the same shape as the adjustment groove and cannot rotate after being installed in the adjustment groove. In this way, the position of the support plate can be conveniently adjusted by adjusting the position of the nut to adjust the height of the upper pressure cap exposed from the upper surface of the right slope section.

[0028] Specifically, the upper pressing cap is divided into a square body, an extension part and a tightening plate;

[0029] The square main body has the same shape as the square slot, and its size is slightly smaller than the square slot. A rod hole is provided in the middle of the bottom. The rod hole is a blind hole, and its diameter is larger than that of the fixing rod, so as to reduce the relative friction resistance between the upper pressure cap and the fixing rod.

[0030] One end of the extension part is connected to the square main body, and the other end passes through the left end of the right slope section, and the width of the clearance hole is the same as the width of the extension part;

[0031] The tightening plate is connected to the lower left part of the extension part, and the lower end is inclined inwards.

[0032] The pressing plate includes a connecting part and a flat plate. The connecting part is in the shape of an inverted right-angle trapezoid and is inserted between the tightening plate and the left end of the right slope section. The bottom is connected to the horizontally arranged flat plate. The pressing plate is inserted into the tightening plate from one side. In order to further improve the connection strength, it can also be fastened by a connecting piece after insertion.

[0033] Through the above design, the present invention proposes a new type of speed bump based on friction nanogenerator, which can not only effectively recover the kinetic energy generated by the passing vehicle and convert it into electrical energy, but also realize passive detection of vehicle speed and weight by analyzing the electrical signals generated thereby, providing an innovative technical solution for the realization of intelligent transportation system.

[0034] The new cover and return device are designed so that the cover no longer drops as a whole, but instead lowers its height on one side. This can better mitigate the impact on the car caused by the up and down movement of the cover when the car passes over it. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In the attached picture:

[0036] Figure 1 A three-dimensional diagram of the speed bump in Example 1;

[0037] Figure 2 for Figure 1 Front view of the middle speed bump;

[0038] Figure 3 for Figure 1 Side view of the speed bump;

[0039] Figure 4 This is a front view of the speed bump in non-working state in Example 2;

[0040] Figure 5 for Figure 4 A partial enlarged view of the X position;

[0041] Figure 6 for Figure 4 A partial enlarged view of the middle Z position;

[0042] Figure 7 This is a front view of the speed bump in working state in Example 2;

[0043] Figure 8 for Figure 7 A partial enlarged view of the Y position;

[0044] Fig. 9 It is a top view of the return device;

[0045] Fig.10 Working principle of paper-based friction nanogenerator;

[0046] Fig.11 The voltage variation curve of the paper-based friction nanogenerator;

[0047] The components represented by the reference numerals in the figure are:

[0048] 1. Left slope section; 11. Bolt hole; 2. Right slope section; 21. Closing plate; 22. Adjustment slot; 23. Fixing rod; 24. Upper pressure cap; 241. Square body; 242. Extension part; 243. Tightening plate; 25. Support plate; 26. Spring; 27. Nut; 28. Clearance hole; 3. Cover plate; 4. Paper-based friction nanogenerator; 5. Fixing screw; 6. Pressing plate; 61. Connecting part; 62. Flat plate. DETAILED DESCRIPTION

[0049] Example 1

[0050] See also Figure 1-Figure 3 The vehicle kinetic energy recovery and passive detection speed bump based on friction nanogenerator includes a symmetrically arranged left slope section 1 and a right slope section 2. A paper-based friction nanogenerator 4 is arranged at the lower part of the space between the left slope section 1 and the right slope section 2. The upper part is closed with a cover plate 3. The upper surface of the cover plate 3 is a plane. The position is changed by a return device, thereby driving the paper-based friction nanogenerator 4 to generate electricity. The left slope section 1, the right slope section 2 and the cover plate 3 together form a trapezoidal shape with an upper side smaller than a lower side.

[0051] The return device can be provided with springs under both ends of the cover plate 3, or a spring can be provided under one side to achieve the position change of the cover plate 3. The cover plate 3 directly or indirectly contacts the paper-based friction nanogenerator 4 to generate electricity.

[0052] The paper-based friction nanogenerator 4 is a double-helix multilayer structure formed by cross-folding an upper friction layer and a lower friction layer;

[0053] The middle of the upper friction layer is paper, and the two sides are conductive copper tapes, and a polytetrafluoroethylene film is arranged outside the conductive copper tape on each side;

[0054] In the middle of the lower friction layer, there are conductive copper tapes on both sides.

[0055] The working principle of paper-based friction nanogenerator can be found in Fig.10 As shown:

[0056] The working mode of the paper-based friction nanogenerator adopts the contact-separation mode. In the initial state ①, the charge is in a conservation state, and no electrical energy output is generated at this time. When the upper friction layer and the lower friction layer gradually approach and enter state ②, due to the negative electrical properties of the polytetrafluoroethylene film, negative friction charges will accumulate on its surface, thereby causing a top-down instantaneous current in the external circuit. When reaching state ③, the charge in the system reaches a dynamic balance. During the separation of the friction layer, the instantaneous current will be triggered again, and the direction is opposite to the previous one (state ④). Through continuous contact and separation cycles, the paper-based friction nanogenerator can continuously generate alternating current.

[0057] The paper-based friction nanogenerator 4 is connected to the energy conversion system and the control unit.

[0058] The energy conversion system uses the converted electrical energy to power other roadside sensors or traffic monitoring equipment.

[0059] The control unit can monitor the vehicle's speed and weight by analyzing the voltage signal generated by the friction nanogenerator.

[0060] See also Fig.11 As shown, when a vehicle passes over a speed bump, an AC signal is generated. Δx is the duration of the pulse signal. When the vehicle speed v is faster, Δx is smaller.

[0061] Preliminary testing stage: When a vehicle passes by, first record the vehicle speed v, then collect the output signal of the friction nanogenerator, and determine the duration Δx of the pulse signal.

[0062] Then, the duration of the voltage curve Δx is taken as the independent variable (x), and the vehicle speed v is taken as the dependent variable (y). The polynomial function is obtained by curve fitting by importing origin:

[0063] y=ax 3 +bx 2 +cx+d

[0064] Calculate the values ​​of a, b, c, and d, write the formula into the program, and obtain the vehicle speed in real time by identifying the duration Δx of the output voltage of the friction nanogenerator.

[0065] Δy is the peak-to-peak voltage of the triboelectric nanogenerator. The greater the force on the triboelectric nanogenerator, the greater its output voltage, that is, the greater Δy. The supporting formula is as follows:

[0066]

[0067] From the formula, we can see that V OC The relative change in V should be linear with the applied force. OC is the maximum open circuit voltage, p0 is the applied force, V OC,0 is the open circuit voltage when force is applied, k is the elasticity of the material, d is the gap distance between the two friction layers in the non-working state, and S is the contact area of ​​the friction layer.

[0068] By writing the formula into the program, the applied force p0 can be obtained in real time.

[0069] The speed bump of the present invention can be directly fixed on the ground for use without digging grooves. The left slope section 1 and the right slope section 2 provide buffering for the wheels to enter and exit the cover plate 3. The cover plate 3 changes its position through a return device. When it is in the highest position, it is flush with the top of the left slope section 1 and the right slope section 2 on both sides. When it is in the lowest position, it compresses the paper-based friction nanogenerator 4 to generate electricity, thereby effectively recovering the kinetic energy generated by the passing vehicle and converting it into electrical energy. It can also realize passive detection of the vehicle speed and weight by analyzing the electrical signal generated thereby.

[0070] The left slope section 1 and the right slope section 2 can be in the shape of a right triangle, which is convenient for making and providing an inclined surface. Bolt holes 11 are respectively opened on the outer surfaces of the inclined surfaces. The vertical cross-section of the bolt hole 11 is in the shape of a right triangle, including a bottom surface and a vertical surface. The bottom surface is connected with a fixing bolt, and the vertical surface is vertically arranged on the side close to the paper-based friction nanogenerator 4.

[0071] Example 2

[0072] See also Figure 4-Figure 9 In order to better mitigate the impact on the car caused by the up and down movement of the cover plate 3 when the car passes through the cover plate 3, the present invention focuses on designing the following structure.

[0073] The upper surface of the right slope section 2 is an inclined surface, with the left end higher and the right end lower. A return device is provided on the left side of the bolt hole 11, the left end of the cover plate 3 is rotatably connected to the right end of the left slope section 1, the right end of the cover plate 3 is pressed on the top of the return device, and a horizontal pressing plate 6 is connected to the left side of the return device, the pressing plate 6 is located on the upper surface of the paper-based friction nanogenerator 4 below the cover plate 3, and the cover plate 3 can press the return device downward to below the upper surface of the right slope section 2 under the action of heavy pressure, and at the same time, the pressing plate presses down the paper-based friction nanogenerator 4 to generate power. Thus, without affecting the work of the paper-based friction nanogenerator 4, the up and down movement of the cover plate 3 is converted into a rotational movement around a fixed axis, forming a good transition between the left slope section 1 and the right slope section 2, thereby avoiding the impact caused by the wheel hitting the groove outlet.

[0074] Specifically, the cover plate 3 is a flat plate 62, and a slanted end surface inclined inward is provided on the left side, see Figure 6 When the cover plate 3 is pressed down to the lowest point, the inclined end surface can be aligned with the vertical surface on the right side of the left slope section 1 to form an integral structure, so that the gravity acting on the cover plate 3 is transferred to the left slope section 1, without making the cover plate 3 very thick to bear the entire wheel weight, and saving costs by optimizing the structure.

[0075] As a preferred solution, a limiting structure is provided at the connection between the left side of the cover plate 3 and the left slope section 1 to limit the angle of the cover plate 3 to rotate upward, so that it can switch between the horizontal state and the right end downward state. Such limiting structures are in various forms, such as plug-in plates and rotating groove styles, and the present invention does not impose any restrictions.

[0076] The right end of the cover plate 3 is an arc-shaped surface, and is tangent to the hypotenuse of the right slope section 2 when in a horizontal state. A wear-resistant cloth is connected between the right end of the cover plate 3 and the right end of the upper plane of the right slope section 2. The arc-shaped transition allows the wheel to reach the right slope section 2 from the cover plate 3 better to avoid impact. The cover plate 3 is connected to the right slope section 2 by the wear-resistant cloth to prevent debris from entering the gap between the two.

[0077] Preferably, the inclination of the upper surface of the right slope section 2 is the same as the angle between the cover plate 3 and the horizontal plane when it is pressed down to the lowest point, and the opposing surfaces of the two can be flush to increase the contact area between the cover plate 3 and the right slope section 2 when it is pressed down onto the right slope section 2.

[0078] A square adjustment groove 22 is provided on the left side of the bolt hole 11 of the right slope section 2. The top of the adjustment groove 22 passes through the upper surface of the right slope section 2. The bottom surface of the adjustment groove 22 is not lower than the bottom surface of the bolt hole 11. The adjustment groove 22 is separated from the bolt hole 11 by a sealing plate 21. A return device is provided in the adjustment groove 22. The return device includes:

[0079] A fixing rod 23, which is vertically fixed to the bottom of the adjusting groove 22, has a thread at the bottom, and a top that does not exceed the upper surface of the right slope section 2;

[0080] The upper pressing cap 24 has its right end buckled on the fixing rod 23, and its left end extends to the left side of the right slope section 2, and is connected to a pressing plate 6 at the lower part of the left end. A corresponding clearance hole 28 is provided on the left side of the right slope section 2 on the pressing path of the upper pressing cap 24;

[0081] The support plate 25 has the same shape as the adjustment groove 22 and is a square plate. It is sleeved on the lower part of the fixing rod 23 and the lower part is supported on the fixing rod 23 by the nut 27. After being installed in the adjustment groove 22, it cannot rotate. In this way, the position of the support plate 25 can be conveniently adjusted by adjusting the position of the nut 27 to adjust the height of the upper pressure cap 24 exposed from the upper surface of the right slope section 2.

[0082] The spring 26 is arranged outside the fixing rod 23 between the upper pressing cap 24 and the supporting plate 25, and has a deformation amount greater than the height of the upper pressing cap 24. When no car passes by, the spring 26 can push the upper pressing cap 24 to push the cover plate 3 to a horizontal state.

[0083] Specifically, the upper pressing cap 24 is divided into a square body 241 , an extending portion 242 and a tightening plate 243 .

[0084] The square body 241 has the same shape as the square slot, and is slightly smaller in size than the square slot. A rod hole is provided in the middle of the bottom. The rod hole is a blind hole, and its diameter is larger than that of the fixing rod 23, so as to reduce the relative friction resistance between the upper pressure cap 24 and the fixing rod 23.

[0085] One end of the extension part 242 is connected to the square body 241, and the other end passes through the left end of the right slope section 2. The width of the clearance hole 28 is the same as the width of the extension part 242;

[0086] The tightening plate 243 is connected to the lower left portion of the extending portion 242, and the lower end thereof is tilted inward.

[0087] The pressing plate 6 includes a connecting portion 61 and a flat plate 62. The connecting portion 61 is in the shape of an inverted right-angled trapezoid and is inserted between the tightening plate 243 and the left end of the right slope section 2. The bottom is connected to the horizontally arranged flat plate 62. The pressing plate 6 penetrates into the tightening plate 243 from one side. In order to further improve the connection strength, it can also be fastened by a connecting piece after penetration.

[0088] See also Figure 1 The speed bump is a multi-section combined structure and can be arranged in any length. The width of the pressing plate 6 should be adapted to the width of the paper-based friction nanogenerator 4 and should not be too large or too small.

Claims

1. Vehicle kinetic energy recovery and passive detection speed bump based on friction nanogenerator, characterized in that: The invention comprises a symmetrically arranged left slope section (1) and a right slope section (2); a paper-based friction nanogenerator (4) is arranged at the lower part of the space between the left slope section (1) and the right slope section (2); and a cover plate (3) is sealed at the upper part; the upper surface of the cover plate (3) is a plane, and the position of the cover plate (3) is changed by a return device, thereby driving the paper-based friction nanogenerator (4) to generate electricity; the left slope section (1), the right slope section (2) and the cover plate (3) together form a trapezoidal shape with an upper side smaller than a lower side; The paper-based friction nanogenerator (4) is connected to an energy conversion system and a control unit.

2. The speed bump according to claim 1, characterized in that: The left slope section (1) and the right slope section (2) are in the shape of a right triangle, and bolt holes (11) are respectively provided on their outer surfaces. The vertical cross-section of the bolt hole (11) is in the shape of a right triangle, and includes a bottom surface and a vertical surface. The bottom surface is connected with a fixing bolt, and the vertical surface is vertically arranged on a side close to the paper-based friction nanogenerator (4).

3. The speed bump according to claim 1, characterized in that: The paper-based friction nanogenerator (4) is a double-helix multilayer structure formed by cross-folding an upper friction layer and a lower friction layer; The upper friction layer has paper in the middle and conductive copper tapes on both sides, and a polytetrafluoroethylene film is arranged outside the conductive copper tape on each side; The middle position of the lower friction layer is provided with conductive copper tapes on both sides.

4. The speed bump according to claim 2, characterized in that: The upper surface of the right slope section (2) is an inclined surface, and a return device is arranged on the left side of the bolt hole (11) thereof; the left end of the cover plate (3) is rotatably connected to the right end of the left slope section (1), and the right end of the cover plate (3) is pressed on the upper side of the return device; the left side of the return device is connected to a horizontal pressing plate (6), and the pressing plate (6) is located on the upper surface of the paper-based friction nanogenerator (4) below the cover plate (3); the cover plate (3) can press the return device downward to below the upper surface of the right slope section (2) under the action of heavy pressure.

5. The speed bump according to claim 4, characterized in that: The cover plate (3) is a flat plate (62) with an inwardly inclined oblique end surface on the left side. When the cover plate (3) is pressed down to the lowest point, the oblique end surface can be aligned with the right vertical surface of the left slope section (1). The right end of the cover plate (3) is an arc-shaped surface and is tangent to the oblique side of the right slope section (2). A wear-resistant cloth is connected between the right end of the cover plate (3) and the right end of the upper plane of the right slope section (2).

6. The speed bump according to claim 4, characterized in that: The inclination of the upper surface of the right slope section (2) is the same as the angle between the cover plate (3) and the horizontal plane when the cover plate (3) is pressed down to the lowest point.

7. The speed bump according to claim 4, characterized in that: An adjusting groove (22) is provided on the left side of the bolt hole (11) of the right slope section (2). The top of the adjusting groove (22) passes through the upper surface of the right slope section (2). The bottom surface of the adjusting groove (22) is not lower than the bottom surface of the bolt hole (11). The adjusting groove (22) is separated from the bolt hole (11) by a sealing plate (21). A return device is provided in the adjusting groove (22). The return device comprises: A fixing rod (23) is vertically fixed to the bottom of the adjusting groove (22), the lower part of which is provided with threads, and the top part of which does not exceed the upper surface of the right slope section (2); The upper pressing cap (24) has a right end buckled on the fixing rod (23), a left end extending to the left side of the right slope section (2), and a pressing plate (6) is connected at the lower part of the left end. A corresponding clearance hole (28) is arranged on the left side of the right slope section (2) on the downward pressing path of the upper pressing cap (24); A support plate (25) is sleeved on the lower part of the fixing rod (23), and the lower part is supported on the fixing rod (23) through a nut (27); The spring (26) is arranged outside the fixing rod (23) between the upper pressing cap (24) and the supporting plate (25).

8. The speed bump according to claim 7, characterized in that: The adjustment groove (22) is a square groove.

9. The speed bump according to claim 8, characterized in that: The upper pressure cap (24) is divided into a square main body (241), an extension portion (242) and a tightening plate (243); The square body (241) has the same shape as the square slot, and a rod hole is provided in the middle of the bottom. The rod hole is a blind hole, and its diameter is larger than the diameter of the fixing rod (23). One end of the extension part (242) is connected to the square body (241), and the other end passes through the left end of the right slope section (2); The tightening plate (243) is connected to the lower left portion of the extension portion (242), and the lower end is tilted inwards.

10. The speed bump according to claim 9, characterized in that: The pressing plate (6) comprises a connecting portion (61) and a flat plate (62); the connecting portion (61) is inserted between the tightening plate (243) and the left end of the right slope section (2), and the bottom is connected to the horizontally arranged flat plate (62).

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