CN115009963A

CN115009963A - Step missing safety device based on radio frequency identification technology

Info

Publication number: CN115009963A
Application number: CN202210772912.5A
Authority: CN
Inventors: 唐立波; 姜涛; 包启帆
Original assignee: Shanghai Mitsubishi Elevator Co Ltd
Current assignee: Shanghai Mitsubishi Elevator Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-09-06

Abstract

The invention discloses a cascade missing safety device based on radio frequency identification technology, which comprises: the RFID passive cascade tag comprises at least one FRID reader, M RFID passive cascade tags and a control system, wherein the FRID reader is provided with a built-in antenna and is in communication connection with the RFID passive cascade tags through the built-in antenna; the RFID passive stair tags are provided with preset stair numbers, and the stair numbers are different and have a preset sequence; the FRID reader-writer has a preset effective reading distance, the FRID reader-writer can simultaneously read the step numbers of N RFID passive step labels within the effective reading distance, N is more than or equal to 3, and the control system judges whether the escalator or the sidewalk has step missing faults or not according to the quantity or sequence of the RFID passive step labels simultaneously read.

Description

Step missing safety device based on radio frequency identification technology

Technical Field

The invention belongs to the technical field of passenger conveying devices, and particularly relates to a step missing safety device based on a radio frequency identification technology.

Background

The steps are connected in a loop shape in a truss of the escalator or moving sidewalk, and circularly move along a track preset by the guide rail to convey passengers. The national standard GB16899-2011 requires that escalators and moving walkways should be able to detect the absence of steps or pallets by means of devices installed on the drive station or the turnaround station and should stop before a gap (caused by the absence of steps or pallets) emerges from the combplate position.

The creation of this gap may come from: when a maintenance worker carries out maintenance, one or more steps are removed, and the steps are not restored when the maintenance is finished; after long-term operation, the fixing parts of the steps fall off to cause the steps to fall off from the shaft or the chain; the steps fail after entering the turn-over area, fall off the chain, and the like.

Reliability and safety of the step missing detection are very critical. There are various methods and devices for detecting step loss proposed in the art, but there are still some drawbacks: if the sensor fails, the detection surface is polluted, the distance of the proximity sensor is not adjusted in place, the sensor fixing support is displaced, and the like, so that false detection and missed detection are caused.

Patent CN201010564674.6 continuously detects the steps at a specific installation position through a sensor, and the sensor outputs a continuous signal during normal operation, and outputs a discontinuous signal when the steps are missing, thereby determining that the steps are missing. However, if the sensor fails, and if there is a step, the "step detected" output continues, the determination logic has a significant risk.

Patent CN201420038008.2 adopts 2 sensors facing the step secondary wheels at different positions, when the staircase has no step missing, the sensors will detect the step rollers at the same time or not detect the step rollers at the same time. When the ladder has step missing, one of the sensors can not detect the step roller. The invention has higher adjustment requirement on the approach sensor, and the ladder can be collided with the step roller when the approach is adjusted too close and can be mistakenly detected and stopped when the distance is adjusted too far.

Patent cn200980105347.x compares the phases of signals obtained by sensor a installed in the drive station and sensor B installed in the steering station, respectively, and determines whether step missing occurs. However, when the steps at sensor a and sensor B are simultaneously missing, the safety function will lose its protective effect.

Patent CN202010406946.3 scans and judges the two-dimensional code adopting 0 and 1 alternate coding through the two-dimensional code sticker and the two-dimensional code scanner. However, the design is sensitive to the use environment, and if the two-dimensional code is polluted or corroded, frequent false detection and ladder stopping can be caused.

Patent CN201810991008.7 determines whether the interval of the pulse time exceeds the threshold value by a combination of a first proximity sensor and a second proximity sensor mounted near the upper edge of the step. Similarly, the invention has high requirement on the installation accuracy of the proximity sensor, and the sensor is very close to the step and is easy to collide. The sensor fixing bracket also has a risk of displacement.

Disclosure of Invention

In order to solve the foregoing technical problem, the present invention provides a step loss safety device based on a radio frequency identification technology, including:

the RFID passive step tag comprises at least one FRID reader-writer, M RFID passive step tags and a control system, wherein M is equal to the total number of steps of the escalator or the sidewalk, and one RFID passive step tag is fixed on each step; the FRID reader-writer is provided with an internal antenna, and communication connection is established with the RFID passive cascade tag through the internal antenna; the RFID passive step labels are provided with preset step numbers, and the step numbers are different and have a preset sequence; the FRID reader-writer has a preset effective reading distance, the FRID reader-writer can simultaneously read the cascade numbers of N RFID passive cascade tags within the effective reading distance, and N is more than or equal to 3; and the control system judges whether the escalator or the sidewalk has step missing faults or not according to the number or sequence of the RFID passive step labels read simultaneously.

Preferably, the FRID reader is installed at one or more of the following locations: a driving station, a steering station, a handrail corner railing or an inner cover plate and an outer cover plate.

Preferably, the RFID passive rung labels are affixed to the non-visible portion of the rung.

Preferably, the distance between the farthest end of the preset effective reading distance and the preset end of the comb teeth is greater than the stopping distance.

Preferably, the method for judging whether the escalator or the sidewalk has the step loss fault by the control system comprises the following steps:

the FRID reader-writer reads the cascade number of the RFID passive cascade label; when the number of the RFID passive cascade tags which are read simultaneously is equal to N and the sequence accords with the preset sequence, the control system outputs a normal signal; when the number of the RFID passive cascade tags which are read simultaneously is smaller than N and the sequence does not accord with the preset sequence, the control system outputs a first fault signal.

Preferably, the control system outputs a second fault signal when the number of simultaneously read RFID passive step tags is greater than N.

Preferably, the control system outputs a third fault signal when the number of simultaneous reading of the RFID passive rung tags is equal to N, but the sequence does not conform to the preset sequence.

Preferably, when the control system outputs the first fault signal, the second fault signal or the third fault signal, a command for stopping the escalator or the sidewalk is sent out simultaneously.

Preferably, the RFID reader reads the step number of the RFID passive step tag before or after the escalator or sidewalk is started.

Drawings

FIG. 1 is a schematic view of a step loss safety device based on RFID technology according to the present invention;

FIGS. 2 to 6 are schematic views illustrating the identification of step labels for determining step missing according to the present invention;

fig. 7 is a schematic view of a passenger carrying section of an escalator or sidewalk according to the present invention.

Reference numerals:

1. an FRID reader; 2. passive fidd ladder tags; 3. a control system; 4. a built-in antenna; 5. an effective reading distance; 6. comb teeth

Detailed Description

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

As shown in fig. 1, the present embodiment provides a step loss safety device based on radio frequency identification technology, including:

the system comprises at least one FRID reader-writer 1, M RFID passive step labels 2 and a control system 3, wherein M is equal to the total number of steps of the escalator or the sidewalk, and each step is fixed with one RFID passive step label 2; the FRID reader-writer 1 is provided with an internal antenna 4, and communication connection is established with the RFID passive cascade tag 2 through the internal antenna 4; the RFID passive stair tag 2 is provided with preset stair numbers, and the stair numbers are different and have a preset sequence; the FRID reader-writer 1 has a preset effective reading distance 5, the FRID reader-writer 1 can simultaneously read the cascade numbers of N RFID passive cascade tags 2 within the effective reading distance 5, and N is more than or equal to 3; and the control system 3 judges whether the escalator or the sidewalk has step missing faults or not according to the quantity or sequence of the RFID passive step tags 1 which are read simultaneously.

The FRID reader 1 is installed at one or more of the following positions: a driving station, a steering station, a handrail corner railing or an inner cover plate and an outer cover plate.

The RFID passive rung tag 2 is fixed to the non-visible portion of the rung. The invisible portion of the step refers to a portion of the step that is not directly visible or accessible to the passenger when the step is in the passenger carrying section; the passenger carrying section refers to a section in which an escalator or a sidewalk can carry passengers, such as a to b of fig. 7.

The non-visible part can be, for example, a tripod, the back of a step tread or kick plate, a stiffener, etc. to which the step tag 2, which is the RFID passive tag 2, is fixed by mechanical structure or adhesive.

In each step label 2, numbers are pre-written, and the step labels are installed on the escalator or the sidewalk and installed in sequence; when the rfid reader reads the information in the step tag, there are step numbers, such as

numbers

4,5,6, etc., and these numbers enter the reading distance in sequence, then they are normal, and if the numbers entering in sequence are

numbers

4,6,7, it can be known that the step number 5 is missing before entering the reading distance. The sequence is such that the numbers read are consecutive, uninterrupted.

The FRID reader-writer 1 placed at any position in the driving station or the steering station establishes communication with the step label 2 within the effective reading distance 5 through the built-in antenna 4 thereof, and reads the step number information;

and the escalator or moving sidewalk control system 3 analyzes the step number information in the signal according to the RFID protocol and judges the step loss.

The method for judging whether the escalator or the sidewalk has the step loss fault by the control system 3 specifically comprises the following steps:

the FRID reader-writer 1 reads the cascade number of the RFID passive cascade tag 2; when the number of the RFID passive cascade tags 2 read simultaneously is equal to N and the sequence conforms to the preset sequence, the control system 3 outputs a normal signal, as shown in FIG. 2;

when the number of the RFID passive cascade tags which are read simultaneously is smaller than N and the sequence does not accord with the preset sequence, the control system outputs a first fault signal. As shown in fig. 3, in the effective reading distance 5, the rfid reader 1 simultaneously recognizes the signal sent by the (N-1) group of step tags and the signal sent by the (N-2) group of step tags, and if the step numbers are not consecutive, it is determined that the step is missing, and the control system 3 outputs a first failure signal and sends a stop command.

When the number of simultaneously reading the RFID passive step tags is greater than N, the control system 3 outputs a second fault signal. As shown in fig. 4, when the rfid reader 1 simultaneously recognizes the signals from the (N +1) sets of step tags within the effective reading distance 5, the steps may fall and remain at the turning position, and the step is determined to be missing, and the step missing signal is transmitted to the escalator or moving sidewalk control system 3, and the control system 3 outputs a second failure signal and issues a stop command.

As shown in fig. 5, within the effective reading distance 5, the rfid reader 1 simultaneously recognizes signals sent by N sets of step tags, and the step numbers are continuous, but the step drops and stays at the turning position, at this time, it is judged as no step missing, only when the 10 th step enters the detection range, as shown in fig. 6, the rfid reader 1 simultaneously recognizes the signal sent by the (N +1) set of step tags, it is judged as step missing, a step missing signal is transmitted to the escalator or moving sidewalk control system 3, and the control system 3 outputs a second fault signal and sends a stop command.

In order to further ensure safety, the distance between the farthest end of the preset effective reading distance and the preset end of the comb teeth is preferably greater than the braking distance. The second fault signal is output to the empty step which is lost after the escalator is stopped, so that the second fault signal cannot enter the passenger carrying section, and the safety of passengers is ensured.

Further, before the escalator is started, the detection of fig. 2 to 5 can be performed, and whether steps are missing in the effective reading distance 5 or not can be pre-determined in advance.

Further, when the number of the RFID passive step labels read simultaneously is equal to N, but the sequence does not accord with the preset sequence, the control system outputs a third fault signal. And issuing a braking instruction. The discontinuous step numbers do not meet the standard requirements of maintenance.

The above description is only an example of the present invention and is not intended to limit the scope of the present invention, and it should be understood that those skilled in the art should be able to recognize that the equivalent and obvious modifications made by the present invention and illustrated in the description and drawings should be included in the scope of the present invention.

Claims

1. A step loss safety device based on radio frequency identification technology is characterized by comprising:

the RFID passive step tag comprises at least one FRID reader-writer, M RFID passive step tags and a control system, wherein M is equal to the total number of steps of the escalator or the sidewalk, and one RFID passive step tag is fixed on each step;

the FRID reader-writer is provided with an internal antenna, and communication connection is established with the RFID passive cascade tag through the internal antenna;

the RFID passive stair tags are provided with preset stair numbers, and the stair numbers are different and have a preset sequence;

the FRID reader-writer has a preset effective reading distance, the FRID reader-writer can simultaneously read the cascade numbers of N RFID passive cascade tags within the effective reading distance, and N is more than or equal to 3;

and the control system judges whether the escalator or the sidewalk has step missing faults or not according to the number or sequence of the RFID passive step labels read simultaneously.

2. The radio frequency identification technology based step loss safety device of claim 1, wherein:

the FRID reader is installed at one or more of the following positions: a driving station, a steering station, a handrail corner railing or an inner cover plate and an outer cover plate.

3. The radio frequency identification technology based step loss safety device of claim 1, wherein:

the RFID passive rung tag is secured to the non-visible portion of the rung.

4. The radio frequency identification technology based step loss safety device of claim 1, wherein:

and the distance between the farthest end of the preset effective reading distance and the preset end of the comb teeth is greater than the braking distance.

5. The radio frequency identification technology based step loss safety device of claim 1, wherein:

the method for judging whether the escalator or the sidewalk has the step loss fault by the control system comprises the following steps:

6. The radio frequency identification technology based step loss safety device of claim 5, wherein:

and when the number of the RFID passive step labels which are read simultaneously is more than N, the control system outputs a second fault signal.

7. The radio frequency identification technology based step loss safety device of claim 5, wherein:

and when the number of the RFID passive step labels which are read simultaneously is equal to N, but the sequence does not accord with the preset sequence, the control system outputs a third fault signal.

8. The radio frequency identification technology based step loss safety device of claim 5,6 or 7, wherein:

and when the control system outputs the first fault signal, the second fault signal or the third fault signal, a command for stopping the escalator or the sidewalk is sent out simultaneously.

9. The radio frequency identification technology based step loss safety device of claim 5, wherein:

and the FRID reader-writer reads the step number of the RFID passive step label before or after the escalator or the sidewalk is started.