CN216611186U - Prevent stepping on empty device - Google Patents

Abstract

The application relates to the technical field of subway security, in particular to a pedaling-preventing device which comprises a pedaling-preventing hollow plate and a driving piece, wherein the driving piece is horizontally arranged at the bottom end of a platform, the end part of the pedaling-preventing hollow plate is fixedly connected to the output end of the driving piece, the pedaling-preventing hollow plate is horizontally arranged and is arranged at the bottom end of the platform in a sliding manner along the horizontal direction, the device also comprises a control circuit for controlling the extension and retraction of the pedaling-preventing hollow plate, the control circuit comprises a first detection circuit, a driving circuit, a second detection circuit and a positioning circuit, and the first detection circuit is used for detecting a trigger signal after a vehicle arrives at the platform; the driving circuit is electrically connected with the driving piece and controls the working state of the driving piece; the second detection circuit is used for detecting whether the end part of one end of the foot-miss prevention plate, which is far away from the driving piece, is in contact with the vehicle body; the positioning circuit is electrically connected with the driving piece and controls the on-off of the driving piece. This application has the effect that reduces the passenger and takes place to step on empty or article and drop the possibility because of the clearance between shield door and the automobile body.

Description

Prevent stepping on empty device

Technical Field

The application relates to the technical field of subway security and protection, in particular to a foot-miss prevention device.

Background

At present, along with the rapid development of rail transit in China, people increasingly select subways, light rails, motor cars, high-speed rails and the like as daily transportation means.

At present, in each station, platform shield door edge is installed one kind and is prevented stepping on empty adhesive tape, prevents stepping on empty adhesive tape salient in the shield door setting, prevents stepping on empty adhesive tape and has shortened the interval between platform and the train, can reduce the passenger and get on or off the vehicle in-process and appear stepping on empty dangerous emergence or reduce the occurence of failure that article dropped to the rail line district from the clearance.

However, in actual situations, due to the difference in image design accuracy, infrastructure construction errors or vehicle body width, a large gap still exists between the vehicle body and the anti-stepping hollow rubber strip after the anti-stepping hollow rubber strip is installed at the shielding door, so that in actual situations, when a passenger's personal small object accidentally drops, the situation that the personal small object drops to a rail running area still often occurs, and the passenger, especially a child, still has the hidden danger of stepping hollow.

SUMMERY OF THE UTILITY MODEL

In order to reduce the passenger and take place to step on empty or article and drop to the possibility of going the rail district because of the clearance between shield door and the automobile body, this application provides one kind and prevents stepping on empty device.

The application provides a prevent stepping on empty device adopts following technical scheme:

the utility model provides a prevent stepping on empty device, is applied to the platform, including preventing stepping on empty board and driving piece, the driving piece level sets up on the lateral wall of platform, prevent stepping on empty board with the driving piece cooperation is connected, prevent stepping on empty board level setting and slide along the horizontal direction and set up the bottom at the platform, the driving piece is used for the drive to prevent stepping on empty board and removes to the direction that is close to the driving piece or keeps away from the driving piece.

Through adopting above-mentioned technical scheme, when the train went to the station, operating personnel opened the driving piece, made the driving piece drive prevent stepping on empty board and stretch out the platform to remove to the automobile body direction, and support tightly on the automobile body under the effect of driving piece, so that fill up the clearance between automobile body and the platform, reduce because of the clearance between shield door and the automobile body and take place to step on empty or the possibility that article dropped.

In some of the embodiments, the pedal-free device further comprises a control circuit for controlling the driving member to work in a forward direction or a reverse direction to move the pedal-free plate, the control circuit comprises a first detection circuit, a driving circuit, a second detection circuit and a positioning circuit, wherein,

the first detection circuit is used for acquiring an external trigger signal after a vehicle arrives at a station and outputting a corresponding first detection signal;

the driving circuit is electrically connected with the driving part and is connected with the first detection circuit to receive the first detection signal and control the working state of the driving part according to the corresponding first detection signal;

the second detection circuit is used for detecting whether the end part of one end, away from the driving part, of the anti-treading hollow plate is in contact with the vehicle body or not and outputting a corresponding second detection signal;

the positioning circuit is electrically connected with the driving piece and connected to the second detection circuit to receive the second detection signal and control the on-off of a power supply loop of the driving piece according to the corresponding second detection signal.

By adopting the technical scheme, when the train does not arrive at the station, the driving piece enables the anti-empty-tread plate to be positioned at the bottom end of the platform, when the train arrives at the station, the first detection circuit receives the trigger signal after the train arrives at the station and outputs a corresponding first detection signal, the driving circuit starts to drive the anti-treading hollow plate to extend out of the platform after receiving the first detection signal, when the anti-empty-pedal plate extends out for a certain distance and then contacts with the train body, the second detection circuit detects that the end part of one end of the anti-empty-pedal plate, which is far away from the driving part, contacts with the train body, and outputs a corresponding second detection signal, the positioning circuit turns off the driving part after receiving the second detection signal, so that the driving part does not drive the pedal empty prevention plate to continue to extend out, but one end of the anti-empty-stepping plate far away from the driving piece is abutted against the vehicle body, so that the gap between the vehicle body and the platform is filled, and the possibility of empty stepping or article falling caused by the gap between the shield door and the vehicle body is reduced.

In some embodiments, the positioning circuit includes a comparison circuit and a switch circuit, the comparison circuit is connected to the second detection circuit to receive the second detection signal and compare the second detection signal with the preset value signal to output a corresponding comparison signal, and the switch circuit is connected to the comparison circuit to receive the comparison signal and control the power supply circuit of the driving member to be switched on and off according to the comparison signal.

By adopting the technical scheme, the comparison circuit compares the second detection signal with the preset value signal, when the second detection signal is greater than the preset value signal, the end part of one end, away from the driving part, of the pedal empty prevention plate is in contact with the automobile body, the comparison circuit outputs the corresponding comparison signal, and after the comparison signal is received by the switch circuit, the driving part is correspondingly turned off.

In some embodiments, the second detection circuit is a pressure sensor, and the second detection circuit is disposed at an end position of the pedal vacancy prevention plate far away from the driving member.

Through adopting above-mentioned technical scheme, pressure sensor is used for detecting and prevents stepping on the empty board and keep away from the one end tip of driving piece and whether has taken place the contact with the automobile body, because of when preventing stepping on the empty board and the automobile body and taking place the moment of contact, the automobile body can produce corresponding reverse acting force to anti-sticking hole board, pressure sensor can detect the size of this reverse force, and compare the size and the default with the default of reverse force, with a definite value, after the numerical value of reverse acting force reachd this value, no longer make the driving piece to prevent stepping on the empty board and drive.

In some embodiments, the second detection circuit is an acceleration sensor, and the second detection circuit is disposed on the anti-treading plate.

By adopting the technical scheme, when the driving piece drives the anti-stepping hollow plate to be close to the automobile body, the acceleration magnitude and the direction of the anti-stepping hollow plate are changed obviously, when the anti-stepping hollow plate is contacted with the automobile body, the direction and the speed of the acceleration on the anti-stepping hollow plate are changed obviously, and the acceleration sensor is used for detecting the change of the acceleration so as to judge whether the anti-stepping hollow plate is contacted with the automobile body.

In some of these embodiments, the anti-step-empty plate is an elastic member having elasticity.

Through adopting above-mentioned technical scheme, prevent stepping on the blank and have elasticity for when preventing stepping on blank and automobile body and contacting, can take place certain deformation in the error time in the circuit triggers, reduce and prevent stepping on blank and automobile body and take place rigid contact and scratch the automobile body or make and prevent stepping on the blank and take place the possibility such as fracture, simultaneously, prevent stepping on the blank and train automobile body contact back, because of there is certain elasticity, the event take place can with seamless inseparable laminating of automobile body after the deformation.

In some of the embodiments, the end of the pedal vacancy prevention plate far away from the driving part is provided with a smooth arc-shaped chamfer.

Through adopting above-mentioned technical scheme, set up the arc chamfer and reduce and prevent stepping on empty board and automobile body and take place the damage to the automobile body when the butt, also can make simultaneously prevent stepping on the easier emergence deformation of empty board.

In some embodiments, the end of the pedal vacancy prevention plate, which is far away from the driving member, is provided with a plurality of saw-tooth protrusions, and the ends of the saw-tooth protrusions, which are far away from the driving member, are provided with smooth arc-shaped chamfers.

Through adopting above-mentioned technical scheme, set up a plurality of cockscomb structure and further reduce and prevent stepping on the scratch of blank to the automobile body, and take place deformation more easily, simultaneously because there is gapped between every cockscomb structure, so when preventing stepping on blank and the automobile body and taking place the butt and arouse to prevent stepping on the blank and take place the deformation back, prevent stepping on the blank can be inseparabler paste tight automobile body.

In some embodiments, the bottom end of the anti-treading hollow plate is provided with a plurality of supporting keels, and the plurality of supporting keels and the end part of the anti-treading hollow plate, which is far away from the driving part, are not in contact with each other.

Through adopting above-mentioned technical scheme, set up the supporting capacity that supports the fossil fragments and promote and prevent stepping on the blank, appear when the clearance between somewhere platform and the train is too big, after preventing stepping on blank and the automobile body and taking place the butt, if child has just in time stepped on preventing stepping on the blank, support the fossil fragments and can play the supporting role to preventing stepping on the blank, avoid appearing child and step on preventing stepping on behind the blank, prevent stepping on the blank and take place the unable circumstances that supports of too big deformation because of the rubber material.

In some of these embodiments, still include warning circuit and warning piece, warning circuit with the driving piece electricity is connected, and when the driving piece takes place to damage, warning circuit received the signal that the driving piece damaged, and control warning piece warns.

Through adopting above-mentioned technical scheme, when the driving piece takes place to damage, warning circuit control warns the piece and takes place to warn, reminds the staff to repair.

In summary, the present application includes at least one of the following beneficial technical effects:

when the train does not arrive at the station, the driving piece enables the anti-empty-treading plate to be positioned at the bottom end of the platform, when the train arrives at the station, the first detection circuit receives a trigger signal after the train arrives at the station, and outputs a corresponding first detection signal, the driving circuit starts to drive the anti-treading hollow plate to extend out of the platform after receiving the first detection signal, when the anti-empty-pedal plate extends out for a certain distance and then contacts with the train body, the second detection circuit detects that the end part of one end of the anti-empty-pedal plate, which is far away from the driving part, contacts with the train body, and outputs a corresponding second detection signal, the positioning circuit turns off the driving part after receiving the second detection signal, so that the driving part does not drive the pedal empty prevention plate to continue to extend out, but one end of the anti-empty-stepping plate far away from the driving piece is abutted against the vehicle body, so that the gap between the vehicle body and the platform is filled, and the possibility of empty stepping or article falling caused by the gap between the shield door and the vehicle body is reduced;

the pressure sensor is used for detecting whether the end part of one end, far away from the driving part, of the anti-stepping hollow plate is in contact with the automobile body or not, and at the moment when the anti-stepping hollow plate is in contact with the automobile body, the automobile body can generate corresponding reverse acting force on the anti-blocking hole plate;

set up the arc chamfer and reduce and prevent stepping on empty board and automobile body and take place the damage to the automobile body when the butt, also can make simultaneously prevent stepping on easier emergence deformation of empty board.

Drawings

FIG. 1 is a block diagram of an embodiment of the present application;

FIG. 2 is a simplified schematic diagram of an embodiment of the present application;

FIG. 3 is a schematic diagram of the electrical connections of the positioning circuit in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of an anti-treading blank plate according to an embodiment of the present application;

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a schematic view of the structure of the anti-treading hollow board in another embodiment of the present application;

fig. 7 is a bottom view of fig. 6.

Description of reference numerals: 1. a step-on prevention plate; 2. a drive member; 3. a control circuit; 31. a first detection circuit; 32. a drive circuit; 33. a second detection circuit; 34. a positioning circuit; 341. a comparison circuit; 342. a switching circuit; 4. arc chamfering; 5. saw-toothed protrusions; 6. a support keel; 7. a warning circuit; 8. a warning member.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses prevent stepping on empty device.

As shown in fig. 1 and 2, a foot-miss prevention device includes a foot-miss prevention plate 1, a driving member 2, and a control circuit 3.

As shown in fig. 2, a pedal is disposed between a screen door and a track area of a train platform, and the pedal protrudes from an edge of the platform. The driving piece 2 level sets up the bottom at the platform, and further, the fixed bottom that sets up in platform footboard department of driving piece 2, the output orientation of driving piece 2 is towards the orbit district, and the orbit district is the track region that the train traveles.

In one embodiment, the driving member 2 is a cylinder, a piston end of the cylinder is fixedly connected with the pedal-miss prevention plate, and the piston end of the cylinder extends and retracts to control the pedal-miss prevention plate to move.

In one of the embodiments, the drive member 2 is a drive motor.

The end part of the anti-treading hollow plate 1 is fixedly connected with the output end of the driving piece 2. The anti-empty board 1 is horizontally arranged at the bottom end of the platform, and further arranged at the bottom end of the platform pedal. Prevent that pedal empty board 1 slides along the horizontal direction and sets up in the bottom of platform footboard, and the direction of sliding is the direction of being close to the line rail district and the direction of keeping away from the line rail district.

Furthermore, the anti-treading plate 1 is made of rubber with certain elasticity, and the rubber has the characteristics of wear resistance and corrosion resistance. The anti-treading hollow plate 1 is rectangular plate-shaped, a plurality of anti-treading hollow plates 1 are arranged at the platform of a train, the anti-treading hollow plates 1 correspond to the positions of all shielding doors on the platform, and the number of the anti-treading hollow plates is also corresponding to the number of the shielding doors. The width of the anti-treading hollow plate 1 is equal to the width of the shield door, and can be slightly wider than the width of the shield door.

As shown in fig. 4 and 5, in one embodiment, the end of the kick-up prevention plate 1 away from the driving member 2 is provided with a smooth arc-shaped chamfer 4, and the arc-shaped chamfer 4 faces the track area.

In another embodiment, as shown in fig. 6 and 7, the end of the pedal idle prevention plate 1 away from the driving member 2 is provided with a plurality of serrations 5, gaps are provided between the serrations 5, and the ends of the serrations 5 away from the driving member 2 are provided with smooth arc-shaped chamfers 4. The serrations 5 are disposed toward the track area. The serration 5 is integrally connected to the kick-up preventing plate 1.

As shown in fig. 5 and 7, further, a support keel 6 is fixedly connected to the bottom end of the anti-treading plate 1, and the support keel 6 may be a metal material with certain strength. The support keel 6 is provided with a plurality of, and a plurality of support keel 6 and prevent stepping on the one end tip that empty board 1 kept away from driving piece 2 and not contact each other. In this application embodiment, each bottom end of the anti-treading hollow plate 1 is fixedly connected with five supporting keels 6, the five supporting keels 6 are arranged along the length direction of the anti-treading hollow plate 1, and gaps with the same distance exist between every two supporting keels 6.

As shown in fig. 1 and 3, the control circuit 3 is used for controlling the anti-treading hollow board 1 to extend and retract, and the control circuit 3 includes a first detection circuit 31, a driving circuit 32, a second detection circuit 33 and a positioning circuit 34.

The first detection circuit 31 is configured to detect a trigger signal after the vehicle arrives at the station, and output a corresponding first detection signal. The trigger signal can be a signal sent by a worker manually, or can be the same trigger signal after the signal control system is accessed and when the shielding door is opened. The driving circuit 32 is electrically connected to the driving member 2, and the driving circuit 32 is connected to the first detecting circuit 31 to receive the first detecting signal and control the operating state of the driving member 2 according to the first detecting signal. The second detection circuit 33 is used for detecting whether the end part of the pedal vacancy prevention plate 1, which is far away from the driving part 2, is in contact with the vehicle body or not, and outputting a corresponding second detection signal. The positioning circuit 34 is electrically connected with the driving member 2, and the positioning circuit 34 is connected with the second detection circuit 33 to receive the second detection signal and control the on/off of the driving member 2 according to the corresponding second detection signal.

The first driving circuit 32 is electrically connected to the screen door of the platform, and when the vehicle arrives at the station, the driver opens the screen door, and the first detection signal can detect the signal when the screen door is opened, and send the first detection signal to the driving circuit 32. Meanwhile, when the vehicle is going to leave the station, the driver closes the shield door, and the first detection signal can detect the signal when the shield door is closed, and send the first detection signal to the driving circuit 32.

The driving circuit 32 can be a traditional driving circuit 32 in the prior art, and only the requirement of driving the cylinder to do telescopic motion or driving the motor to rotate forward and backward according to different signals is met.

Therefore, when the shielding door is opened, the driving circuit 32 receives a corresponding first detection signal and drives the driving part 2 to enable the foot-miss prevention plate 1 to extend out of the platform correspondingly to the first detection signal; when the vehicle is about to leave and the shielding door is closed, the driving circuit 32 receives the corresponding first detection signal, and drives the driving member 2 to retract the anti-empty pedal 1 according to the first detection signal.

In some embodiments, the second detection circuit 33 is a pressure sensor, and the second detection circuit 33 is disposed at an end position of the foot pedal 1 away from the driving member 2, and is used for detecting a reverse acting force of the vehicle body on the foot pedal 1 at the moment when the foot pedal 1 contacts with the vehicle body.

In other embodiments, the second detecting circuit 33 is an acceleration sensor, and the second detecting circuit is disposed in the anti-treading hollow board and is used for detecting the acceleration during the movement of the anti-treading hollow board. When the driving piece drives and prevents stepping on the blank board and remove to the automobile body direction, prevent stepping on the blank board probably at the uniform velocity and be close to the automobile body, also can accelerate to the automobile body motion, when at the uniform velocity, prevent that the acceleration size on the blank board is 0, when accelerating, prevent stepping on the acceleration direction of blank board for preventing stepping on the blank board moving direction, and when preventing stepping on the blank board and contact the automobile body, because of preventing stepping on the relative effort of blank board and automobile body, prevent stepping on the blank board acceleration numerical value and change, and be deceleration motion because of preventing stepping on the blank board, so the acceleration direction takes place the reversal, whether so confirm to prevent stepping on the blank board and butt to the automobile body.

As shown in fig. 3, the positioning circuit 34 includes a comparing circuit 341 and a switching circuit 342, the comparing circuit 341 is connected to the second detecting circuit 33 to receive the second detecting signal, and compares the second detecting signal with the preset value signal to output a corresponding comparing signal, and controls the on/off of the driving member 2 according to the comparing signal. The switch circuit 342 is connected to the comparison circuit 341 to receive the comparison signal and control the on/off of the driving member 2 according to the comparison signal.

The comparison circuit 341 includes a comparator U1, a first resistor R1, and a second resistor R2. One end of the first resistor R1 is connected to VCC, the other end of the first resistor R1 is connected to the second resistor R2, and the other end of the second resistor R2 is grounded. The node of the first resistor R1 and the second resistor R2 is connected to the inverting input terminal of the comparator U1, the non-inverting input terminal of the comparator U1 is connected to the second detection circuit 33, and the output terminal of the comparator U1 is connected to the switch circuit 342.

As shown in fig. 3, the switching circuit 342 includes a transistor Q1 and a relay KM 1. The base of the transistor Q1 is connected to the output end of the comparator U1, the collector of the transistor Q1 is connected to the coil of the relay KM1, and the emitter of the transistor Q1 is grounded. The normally closed contact KM1 of the relay KM1 is connected to the power supply circuit of the driver 2.

When the driving part 2 drives the anti-treading hollow plate 1 to extend out and approach the vehicle body, when the end part of one end of the anti-treading hollow plate 1, which is far away from the driving part 2, is in contact with the vehicle body, the vehicle body provides a reverse acting force for the anti-treading hollow plate 1, the second detection circuit 33 detects the reverse acting force, when the reverse acting force reaches a certain value, the second detection signal is larger than a preset value signal, the comparator U1 outputs a high level, the triode Q1 is switched on after receiving the high level, the normally closed contact KM1-1 of the relay KM1 is disconnected, the power supply circuit stops supplying power to the driving part 2, the driving part 2 no longer drives the anti-treading hollow plate 1 to continue to extend out, and the anti-treading hollow plate 1 and the vehicle body are not moved any more after being tightly abutted to a certain degree.

In another embodiment, as shown in fig. 1, the device further comprises a warning circuit 7 and a warning member 8. The warning circuit 7 may include a detection element for detecting whether the driving element 2 is damaged, and when the detection element detects that the driving element 2 is damaged, a trigger signal is sent to the warning element 8 to control the warning element 8 to send out a warning. The further warning member 8 can be any part capable of warning, such as an LED lamp, a buzzer, a loudspeaker and the like.

The implementation principle is as follows:

when the train does not arrive at the station, the driving member 2 makes the anti-treading hollow plate 1 be at the bottom end of the platform, when the train arrives at the station, the first detection circuit 31 receives the trigger signal after the train arrives at the station and outputs a corresponding first detection signal, the driving circuit 32 receives the first detection signal and starts to drive the anti-treading hollow plate 1 to extend out of the platform, when the anti-treading hollow plate 1 extends out for a certain distance and then contacts with the train body, the second detection circuit 33 detects that the end part of the anti-treading hollow plate 1, which is far away from the driving member 2, contacts with the train body and outputs a corresponding second detection signal, the comparison circuit 341 compares the second detection signal with the preset value signal, when the second detection signal is greater than the preset value signal, it indicates that the end part of the anti-treading hollow plate 1, which is far away from the driving member 2, contacts with the train body, at the moment, the comparison circuit 341 outputs a corresponding comparison signal, and the switch circuit 342 receives the comparison signal, correspondingly, the driving part 2 is turned off, so that the driving part 2 does not drive the anti-treading empty plate 1 to continuously extend, but one end, far away from the driving part 2, of the anti-treading empty plate 1 is abutted to the vehicle body, so that a gap between the vehicle body and a platform is filled, and the possibility of treading empty or article falling caused by the gap between the shielding door and the vehicle body is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. An anti-empty-stepping device is characterized in that: be applied to the platform, including preventing stepping on vacant board (1) and driving piece (2), driving piece (2) level sets up on the lateral wall of platform, prevent stepping on vacant board (1) with driving piece (2) cooperation is connected, prevent stepping on vacant board (1) level setting and follow the horizontal direction and slide the setting in the bottom of platform, driving piece (2) are used for the drive to prevent stepping on vacant board (1) and remove to the direction that is close to driving piece (2) or keeps away from driving piece (2).

2. The step-down prevention device of claim 1, wherein: the pedal-free plate anti-falling device further comprises a control circuit (3) used for controlling the driving piece (2) to work in the forward direction or the reverse direction so as to move the pedal-free plate, wherein the control circuit (3) comprises a first detection circuit (31), a driving circuit (32), a second detection circuit (33) and a positioning circuit (34),

the first detection circuit (31) is used for acquiring an external trigger signal after the vehicle arrives at a station and outputting a corresponding first detection signal;

the driving circuit (32) is electrically connected with the driving part (2), and the driving circuit (32) is connected with the first detection circuit (31) to receive a first detection signal and control the working state of the driving part (2) according to the corresponding first detection signal;

the second detection circuit (33) is used for detecting whether the end part of one end of the pedal vacancy prevention plate (1) far away from the driving piece (2) is in contact with the vehicle body or not and outputting a corresponding second detection signal;

the positioning circuit (34) is electrically connected with the driving piece (2), and the positioning circuit (34) is connected with the second detection circuit (33) to receive the second detection signal and control the on-off of a power supply loop of the driving piece (2) according to the corresponding second detection signal.

3. The step-down prevention device of claim 2, wherein: the positioning circuit (34) comprises a comparison circuit (341) and a switch circuit (342), the comparison circuit (341) is connected to the second detection circuit (33) to receive the second detection signal and compare the second detection signal with a preset value signal to output a corresponding comparison signal, and the switch circuit (342) is connected to the comparison circuit (341) to receive the comparison signal and control the on-off of a power supply loop of the driving part (2) according to the comparison signal.

4. A step-down prevention device as claimed in claim 3, wherein: the second detection circuit (33) is a pressure sensor, and the second detection circuit (33) is arranged at the end position of one end of the pedal empty prevention plate (1) far away from the driving piece (2).

5. A step-down prevention device as claimed in claim 3, wherein: the second detection circuit (33) is an acceleration sensor, and the second detection circuit (33) is arranged on the pedal-free plate (1).

6. The step-down prevention device of claim 1, wherein: the pedal vacancy prevention plate (1) is an elastic piece with elasticity.

7. The step-down prevention device of claim 6, wherein: one end part of the pedal empty prevention plate (1) far away from the driving piece (2) is provided with a smooth arc-shaped chamfer (4).

8. The step-down prevention device of claim 6, wherein: prevent stepping on empty board (1) and keep away from the one end tip of driving piece (2) and be provided with a plurality of serration (5), it is a plurality of serration (5) keep away from the one end of driving piece (2) and all are provided with level and smooth arc chamfer (4).

9. An anti-step-empty device according to claim 7 or 8, characterized in that: prevent stepping on empty board (1) bottom and be provided with support fossil fragments (6), support fossil fragments (6) are provided with a plurality of, and a plurality of support fossil fragments (6) and prevent stepping on empty board (1) and keep away from the one end tip contactless of driving piece (2).

10. The step-down prevention device of claim 1, wherein: still include warning circuit (7) and warning piece (8), warning circuit (7) with driving piece (2) electricity is connected, and when driving piece (2) took place to damage, warning circuit (7) received the signal that driving piece (2) damaged, and control warning piece (8) warn.

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