CN119247500A - A method for identifying transparent, semi-transparent, small-volume objects and elevator light curtain - Google Patents
A method for identifying transparent, semi-transparent, small-volume objects and elevator light curtain Download PDFInfo
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- CN119247500A CN119247500A CN202411794449.XA CN202411794449A CN119247500A CN 119247500 A CN119247500 A CN 119247500A CN 202411794449 A CN202411794449 A CN 202411794449A CN 119247500 A CN119247500 A CN 119247500A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
- B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
本发明涉及电梯光幕技术领域，具体涉及一种识别透明、半透明、小体积物体的方法及电梯光幕。所述光幕TX端设置有若干第一发射管和若干第一接收管，所述光幕RX端设置有若干第二接收管，本发明通过在同侧安装第一发射管与第一接收管，利用反射与漫反射的红外线，使不易检测的小体积、透明、半透明物体易于检出，提高了电梯光幕的功能性，本发明通过实验室的数据采集和分析，分析处将常见干扰信息的特征，运用多种通过多个判断要求，如电压值的差值、电压值的变化幅度、检测电压检测值对应距离下电压平均值的差距等，排除干扰信号，能够精准判断出透明、半透明、小体积物体，提高电梯运行的安全性。
The present invention relates to the technical field of elevator light curtains, and specifically to a method for identifying transparent, translucent, and small-volume objects and an elevator light curtain. The light curtain TX end is provided with a plurality of first transmitting tubes and a plurality of first receiving tubes, and the light curtain RX end is provided with a plurality of second receiving tubes. The present invention installs the first transmitting tube and the first receiving tube on the same side, and utilizes reflected and diffusely reflected infrared rays to make it easy to detect small-volume, transparent, and translucent objects that are difficult to detect, thereby improving the functionality of the elevator light curtain. The present invention collects and analyzes the characteristics of common interference information through laboratory data, and uses multiple judgment requirements, such as the difference in voltage values, the amplitude of voltage value changes, and the difference in the average voltage value under the corresponding distance of the detection voltage detection value, to eliminate interference signals, and can accurately judge transparent, translucent, and small-volume objects, thereby improving the safety of elevator operation.
Description
Technical Field
The invention relates to the technical field of elevator light curtains, in particular to a method for identifying transparent, semitransparent and small-size objects and an elevator light curtain.
Background
An elevator light curtain is an elevator door safety protection device manufactured by utilizing a photoelectric induction principle and is used for protecting the safety of elevator personnel and articles.
The door closing protection device generally adopts an infrared light curtain, the infrared light curtain is composed of a transmitting component and a receiving component, the transmitting end transmits an infrared light beam to the receiving end to receive the infrared light beam, and according to the specification 5.3.6.2.2.1 in GB/T7588.1-2020:
1. The protection device (such as light curtain) can cover at least 25 mm-160 mm of area above the car sill.
2. The protection device should be able to detect obstacles with a diameter not smaller than 50 mm.
The elevator light curtains on the market at present generally cannot detect less than 50mm of obstructions at 100% and cannot identify transparent, semitransparent objects.
Patent CN216918247U discloses an elevator light curtain capable of detecting transparent objects, and a plurality of infrared receiving tubes are installed at the light curtain TX end and used for receiving reflected signals and detecting transparent objects so as to avoid safety accidents. However, the method has a serious problem that the side surfaces of the light filtering strip and the elevator door at the elevator light curtain RX end are opposite to the elevator light curtain TX end, and reflected infrared light is always generated when the door is closed, so that misjudgment can be definitely caused, and whether the light filtering strip, the elevator door and the like belong to the reflection of the environment or the reflection of transparent and semitransparent objects is difficult to distinguish. Thus the method needs further optimization.
Disclosure of Invention
The invention solves the problems of low obstacle detection rate smaller than 50mm and easy misjudgment when identifying transparent and semitransparent objects in the prior art, and provides a special elevator light curtain and a method for identifying transparent, semitransparent and small-size objects.
The invention is realized by the following technical proposal, the method for identifying transparent, semitransparent and small-volume objects adopts an elevator light curtain comprising a light curtain TX end and a light curtain RX end,
The light curtain TX end is provided with a plurality of first transmitting pipes and a plurality of first receiving pipes, each first receiving pipe is matched with at least one first transmitting pipe to form a reflection signal group, and the positions of the plurality of first receiving pipes are provided with light blocking structural members;
The light curtain RX end is provided with a plurality of second receiving pipes, and each second receiving pipe is matched with at least one first transmitting pipe to form a correlation signal group;
In the elevator door closing process, an elevator light curtain is started to scan, a reflection signal group and a correlation signal group work simultaneously, namely when a first transmitting tube transmits infrared rays, a corresponding first receiving tube and a corresponding second receiving tube are started simultaneously to be used for signal detection, and the following judgment is carried out:
judging whether the infrared signal is received by the second receiving tube or not, if so, judging that a shielding object exists, and if not, judging 2;
judging whether all the first receiving pipes have no signals, if so, judging that no shielding object exists, and if not, judging 3;
Judging whether only part of the first receiving tubes receive the signals, if yes, judging that a shielding object exists if the signal strength is higher than the lowest signal strength acceptable by the first receiving tubes, if yes, but judging that no shielding object exists if the signal strength is only the lowest signal strength acceptable by the first receiving tubes, and if no, judging 4;
Judgment 4, judging by one or more of the following three methods:
Judging whether U a-b1＜Ui＜Ua+b1 is satisfied, wherein U i is the voltage received by any first receiving tube in the round of scanning, U a is the average value of the voltages of all the first receiving tubes in the round of scanning, and b 1 is the set first voltage allowable error;
judging whether the voltage of U i-b2＜Ui+1＜Ui+b2 is met, wherein U i is the voltage received by any first receiving tube in the round of scanning, U i+1 is the voltage received by the first receiving tube adjacent to the first receiving tube corresponding to U i, and b 2 is a set second voltage allowable error;
Judging whether the voltage of the first receiving tube meets the requirement of 4.3, wherein U a is the actual average value of the voltages of all the first receiving tubes in the round of scanning, the distance between light curtains is detected in the scanning process, U c is the theoretical average value of the voltages of all the first receiving tubes under the light curtain distance, and b 3 is the set third voltage allowable error;
if the condition is satisfied, it is determined that there is no shielding object, and if the condition is not satisfied, it is determined that there is a transparent shielding object.
Further, the data b 1 、b2、b3、Uc are obtained by a laboratory, the elevator environment is simulated in the laboratory, the light curtain TX end and the light curtain RX end are both arranged on an elevator door, no shielding object is arranged between the light curtain TX end and the light curtain RX end, multiple-round scanning is carried out, the voltage of all the first receiving pipes in the multiple-round scanning is collected, namely, the reflected light signal data from the light curtain RX end filter bar and the elevator door frame are collected, b 1、b2 、b3、Uc is obtained through analysis of the collected data, and the data are recorded in a storage of the MCU.
Further, when the first voltage allowable error b 1 is obtained by analysis, the following method is adopted:
collecting voltage data from the first receiving tube to the last receiving tube of each round, calculating an average value of the voltage data, calculating the maximum difference value between the voltage data of all the first receiving tubes of the round and the average voltage value of the round, selecting the maximum value of the maximum difference values of a plurality of rounds, multiplying the maximum value by a set coefficient, and recording as b 1.
Further, when the second voltage allowance b 2 is obtained by analysis, the following method is adopted:
And collecting voltage data from the first receiving tube to the last receiving tube of each round, calculating voltage difference values of two adjacent first receiving tubes, calculating the maximum value of the voltage difference values in each round, and recording the maximum value of the voltage difference values in a plurality of rounds as b 2 after multiplying a set coefficient.
Further, when the third voltage allowable errors b 3 and U c are obtained by analysis, the following method is adopted:
detecting the distance between the elevator light curtains, wherein U c is the average value of the voltages of all the first receiving pipes at the distance, and adjusting the distance between the elevator light curtains to obtain the comparison relation between U c and the light curtain distance;
And under the same distance, collecting the voltage difference value from the first receiving tube to the last first receiving tube in each round of scanning, and selecting the maximum value of the voltage difference values in a plurality of rounds of scanning to multiply the maximum value by a set coefficient and recording the maximum value as b 3.
Further, during the data collection in the laboratory, the light curtain is adjusted for multiple times during multiple rounds of scanning, and the adjustment mode comprises one or more of the following modes:
Adjusting the distance between an elevator light curtain TX end and an elevator light curtain RX end;
Adjusting the emission intensity of a first emission tube at the TX end of the elevator light curtain;
adjusting the horizontal tolerance between the elevator light curtain TX end and the light curtain RX end;
adjusting longitudinal tolerance between an elevator light curtain TX end and a light curtain RX end;
adjusting a horizontal let-off angle between an elevator light curtain TX end and a light curtain RX end;
Adjusting a longitudinal angle between an elevator light curtain TX end and a light curtain RX end;
And (5) adjusting the cleanliness of the elevator light screen filter strip and the elevator door frame.
In another aspect of the invention, an elevator light curtain is provided that includes a processor and a memory having at least one instruction stored therein, the instructions being executable by the processor to cause the elevator light curtain to perform the method of identifying transparent, translucent, small-volume objects.
Further, the light blocking structural member or the combination of the light blocking structural member and the circuit board where the first receiving pipe is located forms a cavity with the first receiving pipe, the cavity is only provided with a long and narrow opening facing the light filtering strip, the vertical section of the cavity is in a horn shape with large outside and small inside, and the light blocking structural member extends forwards to the light filtering strip.
Further, the inner wall of the light blocking structural member is provided with a reflective coating.
Further, the horn-shaped curved surface or inclined surface of the inner wall of the light blocking structural member is provided with a reflective coating, and the left side surface and the right side surface of the inner wall of the light blocking structural member are free of reflective coatings.
The beneficial effects of the invention are as follows:
1. according to the elevator light curtain, the first transmitting tube and the first receiving tube are arranged on the same side, and the infrared rays which are reflected and diffusely reflected are utilized, so that a small-size transparent and semitransparent object which is not easy to detect is easy to detect, and the functionality of the elevator light curtain is improved.
2. According to the invention, through data acquisition and analysis in a laboratory, the analysis department uses the characteristics of common interference information, and various judgment requirements such as the difference value of voltage values, the variation range of the voltage values, the difference between voltage average values under the corresponding distance of detection voltage detection values and the like are applied, so that interference signals are eliminated, transparent, semitransparent and small-volume objects can be accurately judged, and the operation safety of an elevator is improved.
3. According to the elevator light curtain, the light blocking structural member is additionally arranged at the TX end of the light curtain, the cavity is only provided with the long and narrow opening facing the light filtering strip, the vertical section of the cavity is in a horn shape with the large outside and the small inside, and the light blocking structural member extends forwards to the light filtering strip, so that the first receiving tube can be prevented from directly receiving infrared rays reflected by the inner surface of the light filtering strip. The long and narrow opening can enlarge the light inlet angle from the vertical direction, reduce the light inlet angle from the horizontal direction, and avoid the interference in the horizontal direction, for example, when the elevator is fully loaded, the clothes of people close to the door are easy to reflect infrared rays, and if the horizontal angle is larger, misjudgment is easy to occur, so that the misjudgment rate of the elevator light curtain is lower.
Drawings
Fig. 1 is a diagram of a scanning pattern of a conventional elevator light curtain;
Fig. 2 is a view showing a construction of an elevator light curtain according to the present invention;
FIG. 3 is a logic diagram of a method of identifying transparent, translucent, low-volume objects according to the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the present invention;
FIG. 6 is a schematic diagram of a third embodiment of the present invention;
FIG. 7 is a schematic diagram of a fourth embodiment of the present invention;
FIG. 8 is a diagram of a fifth embodiment of the present invention;
FIG. 9 is a diagram of a sixth embodiment of the present invention;
FIG. 10 is a seventh schematic diagram of an embodiment of the present invention;
FIG. 11 is a schematic diagram of an eighth embodiment of the present invention;
Fig. 12 is a schematic view of an elevator light curtain of the present invention identifying a small volume object;
FIG. 13 is an enlarged view of a portion of the light curtain TX;
Fig. 14 is a cross-sectional view A-A of fig. 13.
In the figure, a light curtain TX end is 100, a first transmitting tube is 101, a first receiving tube is 102, a light blocking structural member is 103, a light curtain RX end is 200, and a second receiving tube is 201.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The infrared light curtain is composed of a transmitting end (namely a TX end) and a receiving end (namely a RX end), wherein the TX end is composed of a transmitting tube, a control unit (MCU), a change-over switch and the like, and the RX end is composed of a receiving tube, a change-over circuit, an amplifying circuit, an MCU and the like. When the infrared light beam emitted by the emitting tube at the TX end is received by the corresponding receiving tube at the RX end, the connection line between the emitting tube and the receiving tube is called a light beam. The denser the beam coverage, the stronger the detection sensitivity, and the less the beam is, the worse the detection sensitivity. To improve the detectability, a combined scanning mode of parallel beams and cross beams is used (as shown in fig. 1). Wherein 3 is transmitted and 3 is received as a parallel light beam, the 3-transmission 1-transmission, the 3-transmission 2-transmission, the 3-transmission 4-transmission and the 3-transmission 5-transmission are cross beams. Typically there are 36 transmit tubes at the TX end and 36 receive tubes at the corresponding RX end. The beam scanning has the following angles, the tube No. 1 on the TX end transmits, the tube No. 1 on the RX end receives (hereinafter abbreviated as 1 transmit 1 receive), 2 transmit 2 receive, 36 transmit 36 receive. The scanning angle 2, 1,2, 3, 4, 35, 36, the scanning angle 3, 1, 3, 2,4, 34, 36, the scanning angle 4, 2, 1, 3, 2, 36, 35, 5, 3, 1,4, 2, 36, 34. Each scan angle is 1 cycle from 1 to 36, and each cycle is about 45 ms, so that the beam pattern of 5 angles "on screen" is plotted with the residual effect in seconds, as shown in fig. 2, for all beams shown. The transmitting end transmits infrared light beams to the receiving end for identification, so that a cross beam network is formed between the receiving end and the transmitting end. But appears to catch the fly at the elbow for detecting transparent, translucent, small volume objects.
The elevator light curtain adopted by the invention is the same as the conventional elevator light curtain, and comprises a light curtain TX end 100 and a light curtain RX end 200,
The light curtain TX end 100 is provided with a plurality of first transmitting pipes 101 and a plurality of first receiving pipes 102, each first receiving pipe 102 is matched with at least one first transmitting pipe 101 to form a reflected signal group, a light blocking structural member 103 is arranged at each of the plurality of first receiving pipes 102, the light blocking structural member 103 prevents the first receiving pipes 102 from directly receiving signals of the first transmitting pipes 101, the reflected signal group can adopt a scanning angle of 1st, namely 1st, 2 nd, 36 th, or similar to the conventional scanning, a plurality of scanning angles are adopted, the scanning angle of 2 nd, 1st, 2 nd, 3 rd, 35 th, 3 rd, 1st, 2 nd, 4 nd, 34 th, 4 th, 2 nd, 3 nd, 36 th, 5 th, 3 rd, 4 nd, 36 th, 36 nd, and 34 th, but not the same.
The light curtain RX end 200 is provided with a plurality of second receiving tubes 201, and each second receiving tube 201 is at least matched with one first transmitting tube 101 to form a correlation signal group, so that conventional scanning can be performed;
in the process of closing the elevator door, the elevator light curtain is started to scan, the reflected signal group and the correlation signal group work simultaneously, namely when the first transmitting tube 101 transmits infrared rays, the corresponding first receiving tube 102 and second receiving tube 201 are simultaneously started to be used for signal detection, and the following judgment is carried out:
Judging 1 whether the second receiving tube 201 does not receive the infrared signals, if yes, judging that an object blocks the route of the correlation signal group, if no, judging 2;
Judging whether all the first receiving pipes 102 have no signal, if so, judging that no object is shielded or the reflected signal is yes, if not, judging that no shielding object exists, and if so, judging 3;
Judging 3 whether only part of the first receiving tube 102 receives signals, if yes, judging that a shielding object exists if the signal intensity is higher than the lowest signal intensity which can be accepted by the first receiving tube 102, if yes, judging that no shielding object exists if the signal intensity is only the lowest signal intensity which can be accepted by the first receiving tube 102, and judging 4 if no, wherein due to the existence of an elevator door frame and a filter strip, the two infrared rays which can be reflected and diffusely reflected by the first receiving tube 101 are judged, when the distance is smaller than a certain distance in the elevator door closing process, diffuse reflection signals are strong enough to enable the first receiving tube 102 to be successfully detected, but at the critical position of the distance, part of the first receiving tube 102 has signals, part of the first receiving tube 102 has no signals, but the signal intensity is the lowest signal intensity which can be accepted by the first receiving tube 102, so that a judging condition is increased (and the signal intensity is higher than the lowest signal intensity which can be accepted by the first receiving tube 102) is used for discharging interference caused by the critical position, when the diffuse reflection of a small-volume object is shielded by the first receiving tube 102, the signal intensity which is higher than the first receiving tube 102, and the signal intensity which can be easily judged that the signal intensity is higher than the first receiving tube 102 is far from the first receiving tube 102, when the signal intensity which is higher than the first receiving tube 102 is far from the first receiving tube, and the signal intensity which can be easily judged that the signal intensity is far from the first receiving tube 102.
Judgment 4, judging by one or more of the following three methods:
Judging whether the voltage received by any first receiving tube 102 in the round of scanning is U a-b1＜Ui＜Ua+b1, wherein U i is the voltage received by any first receiving tube 102 in the round of scanning, U a is the average value of the voltages of all the first receiving tubes 102 in the round of scanning, b 1 is a set first voltage allowable error, and in theory, the infrared intensities received by thirty-six first receiving tubes 102 from the elevator door frame and diffuse reflection of the filter strip are almost the same and cannot deviate from the average value too much, so that the voltage is judged by the average value of the voltages, whether the voltage has abrupt change or not, and the existence of abrupt change indicates that an infrared signal is reflected by a shielding object, and the shielding object can be a small-size transparent and semitransparent object.
Judging whether the condition is met by 4.2, wherein U i-b2＜Ui+1＜Ui+b2 is met, U i is voltage received by any first receiving tube 102 in the round of scanning, U i+1 is voltage received by the first receiving tube 102 adjacent to the first receiving tube 102 corresponding to U i, b 2 is a set second voltage allowable error, theoretically, when an elevator light curtain is installed, a light curtain TX end 100 and a light curtain RX end 200 have a certain included angle, therefore, the infrared intensity received by thirty-six first receiving tubes 102 from the elevator door frame and the diffuse reflection light filtering strip is in increasing or decreasing, the increasing and decreasing amplitude is limited, the change condition of the infrared intensity of the adjacent first receiving tubes 102 can be distinguished through a formula U i-b2＜Ui+1＜Ui+b2, and the change is large, so that a small-size transparent semitransparent object is possible.
And judging whether the voltage of the first receiving tube 102 is 4.3 or not, wherein U a is the actual average value of the voltages of all the first receiving tubes 102 in the round of scanning, the distance between light curtains is detected in the scanning process, U c is the theoretical average value of the voltages of all the first receiving tubes 102 under the light curtain distance, b 3 is a set third voltage allowable error, theoretically, the closer the light curtain distance is, the higher the voltage is when the first receiving tube 102 receives the infrared intensity diffusely reflected by an elevator door frame and a filter strip, but the average voltages are not greatly different under the same distance, if a small-size transparent and semitransparent object appears, the reflected infrared ray is enhanced, and the average voltage value is larger than the theoretical value under the distance. Therefore, whether a small-volume, transparent or semitransparent object exists can be judged through the formula U c-b3＜Ua＜Uc+b3.
In practical application, the data b 1 、b2、b3、Uc are obtained by a laboratory, the laboratory simulates the elevator environment, the light curtain TX end 100 and the light curtain RX end 200 are both arranged on an elevator door, no shielding object is arranged between the light curtain TX end 100 and the light curtain RX end 200, multiple-round scanning is performed, the voltages of all the first receiving pipes 102 in the multiple-round scanning are collected, namely, the data of the reflected light signals from the light curtain RX end 200 filter bar and the elevator door frame are collected, b 1 、b2 、b3、Uc is obtained through the analysis of the collected data, and the data are recorded in a storage of the MCU.
In practical application, when the first voltage allowable error b 1 is obtained by analysis, the following method is adopted:
Collecting voltage data from the first receiving tube 102 to the last receiving tube 102 of each round, calculating an average value of the voltage data, calculating the maximum difference value between the voltage data of all the first receiving tubes 102 of the round and the average voltage value of the round, selecting the maximum value of the maximum difference values of a plurality of rounds, multiplying the maximum value by a set coefficient, and recording as b 1. The set coefficient is selected through experience and realization effect of a laboratory, and the low false detection rate and the low omission rate are met.
In practical application, when the second voltage allowable b 2 is obtained by analysis, the following method is adopted:
The voltage data from the first receiving tube 102 to the last receiving tube 102 of each round is collected, the voltage difference value of two adjacent first receiving tubes 102 is calculated, the maximum value of the voltage difference value in each round is calculated, and the maximum value of the voltage difference value in a plurality of rounds is selected and recorded as b 2 after being multiplied by a set coefficient. The set coefficient is selected through experience and realization effect of a laboratory, and the low false detection rate and the low omission rate are met.
In practical application, when the third voltage allowable errors b 3 and U c are obtained by analysis, the following method is adopted:
Detecting the distance between the elevator light curtains, and measuring the distance by a distance sensor or the light curtains by an RSSI distance measuring principle, wherein the description is not given here, U c is the average value of the voltages of all the first receiving pipes 102 under the distance, and the distance between the elevator light curtains is adjusted to obtain the comparison relation between U c and the light curtain distance;
And under the same distance, the voltage difference value from the first receiving tube 102 to the last first receiving tube 102 in each round of scanning is acquired, and the maximum value of the voltage difference value in a plurality of rounds of scanning is selected and recorded as b 3 after being multiplied by a set coefficient. The set coefficient is selected through experience and realization effect of a laboratory, and the low false detection rate and the low omission rate are met.
In practical application, during the data collection in the laboratory, the light curtain is adjusted for multiple times during multiple rounds of scanning, and the adjustment mode comprises one or more of the following:
The distance between the elevator light curtain TX end and the light curtain RX end 200 is adjusted, the light curtain distance is directly related to the diffuse reflection infrared intensity of the elevator door frame and the filter strip, the distance between the elevator light curtains is adjusted, and multi-round detection is carried out to obtain the comparison relation between U c and the light curtain distance;
The method comprises the steps of adjusting the emission intensity of a first emission tube 101 at the elevator light curtain TX end, wherein the emission intensity of the first emission tube 101 has a direct relation with the diffuse reflection infrared intensity of an elevator door frame and a filter strip, and influences the diffuse reflection signal intensity when a small-volume, transparent and semitransparent object appears;
adjusting the horizontal tolerance between the elevator light curtain TX end and the light curtain RX end 200, taking into account the horizontal tolerance generated at the time of installation;
Adjusting the longitudinal tolerance between the elevator light curtain TX end and the light curtain RX end 200, taking into account the longitudinal tolerance generated at installation;
adjusting the horizontal angle between the elevator light curtain TX end and the light curtain RX end 200, wherein the horizontal angle generated during installation needs to be considered;
Adjusting the longitudinal angle between the elevator light curtain TX end and the light curtain RX end 200, wherein thirty-six first receiving pipes 102 receive the infrared intensity diffusely reflected by the elevator door frame and the filter strip to be gradually increased or gradually decreased, the relation between the amplitude of signal change and the longitudinal angle is maximum, and the horizontal angle generated during installation needs to be considered;
The cleanliness of the elevator light screen filter bar and the elevator door frame is adjusted, and whether the elevator light screen filter bar and the elevator door frame are clean or not can be influenced. Elevator filter strip, elevator diffuse reflection's infrared intensity. It is necessary to take into account the cleanliness of the elevator light screen filter bar, elevator door frame.
When the data are detected, the actual working condition of the elevator can be truly simulated by taking the content into consideration, and the probability of false detection and missed detection is effectively increased.
The scene simulation is performed according to several examples:
in the first embodiment, as shown in fig. 4, the middle is the normal scanning beam of the light curtain TX end 100 and the light curtain RX end 200, the left side is the potential diagram of the first receiving tube 102, the right side is the potential diagram of the second receiving tube 201, no shielding object is left at this time, the elevator doors are far apart, the light filtering strip and the elevator door frame are weak in reflection, so that all the second receiving tubes 201 have signals, the first receiving tube 102 has no signal, the condition of judging 2 is met, and no shielding object is left.
In the second embodiment, as shown in fig. 5, the middle is the normal scanning beam of the light curtain TX end 100 and the light curtain RX end 200, the left side is the potential diagram of the first receiving tube 102, the second receiving tubes 201 on the right side are the potential diagrams, at this time, there is a small-volume shielding object, the small-volume shielding object is just in the blind area of the normal scanning beam, so all the second receiving tubes 201 have signals, the elevator doors are far away, the filter strip and the elevator door frame reflect weaker, so most of the first receiving tubes 102 have no signals, the first receiving tubes 102 close to the small-volume shielding object have signals, the closer the distance is, the stronger the signals are, the first receiving tubes 102 with the sequence number 3 are closest to the shielding object, so the signals are strongest, by judging the judging conditions of 3, all the second receiving tubes 201 have no signals, and part of the first receiving tubes 102 have signals, and then the shielding object is judged.
In the third embodiment, as shown in fig. 6, the middle is the normal scanning beam of the light curtain TX end 100 and the light curtain RX end 200, the left side is the potential diagram of the first receiving tube 102, the right side is the potential diagram of the second receiving tube 201, at this time, there is a vertical transparent shielding object, the normal scanning beam can penetrate the transparent shielding object, so all the second receiving tubes 201 have signals, the elevator doors are far apart, the light filtering strip and the elevator door frame are weak in reflection, so most of the first receiving tubes 102 have no signals, the first receiving tubes 102 close to the transparent glass have signals, and all the second receiving tubes 201 have no signals, and part of the first receiving tubes 102 have signals, so that the shielding object is judged.
In the fourth embodiment, as shown in fig. 7, the light beam is scanned (black) and reflected (red) by the light curtain TX end 100 and the light curtain RX end 200, the potential diagram of the first receiving tube 102 is on the left side, the potential diagram of the second receiving tube 201 is on the right side, no shielding object is present at this time, the second receiving tubes 201 all have signals, the first receiving tube 102 can detect the infrared ray reflected by the elevator door frame and the filter bar, all the first receiving tubes 102 have signals, and the signals are relatively uniform, so the process of judging 4 is entered, if the judging condition of 4.1 is adopted, the signals are relatively uniform, so the U a-b1＜Ui＜Ua+b1 can be satisfied, if the judging condition of 4.2 is adopted, the signals are not progressively decreased, so the U i-b2＜Ui+1＜Ui+b2 can be satisfied, if the judging condition of 4.3 is adopted, the average value and the theoretical value of the voltages are consistent, and therefore, the judging as no shielding object can be judged.
In the fifth embodiment, as shown in fig. 8, the light curtain TX end 100 and the light curtain RX end 200 are used for normal scanning (black) and reflected (red) beams in the middle, the first receiving tube 102 is used for the left side, the second receiving tube 201 is used for the right side, a small-volume shielding object is present at this time, the small-volume shielding object is just in the blind area of the normal scanning beam, the second receiving tubes 201 all have signals, the first receiving tube 102 can detect the infrared rays reflected by the elevator door frame and the filter strip, all the first receiving tubes 102 have signals, the first receiving tube 102 close to the small-volume shielding object has signals, the closer the distance is, the stronger the signals are, the process of judging 4 is entered, if the judging condition of 4.1 is adopted, the difference between the maximum voltage value and the minimum voltage value is too large, the voltage variation amplitude of the first receiving tube 102 close to the small-volume shielding object is not satisfied with U a-b1＜Ui＜Ua+b1, if the judging condition of 4.2 is adopted, the average value of the voltage close to the small-volume shielding object is not satisfied with U i-b2＜Ui+1＜Ui+b2, if the judging condition of 4.3 is adopted, and the average value of the voltage value is higher than the theoretical shielding value can be judged.
In the sixth embodiment, as shown in fig. 9, the light curtain TX end 100 and the light curtain RX end 200 are used for regular scanning (black) and reflected (red) beams, the first receiving tube 102 is used for the left side, the second receiving tube 201 is used for the right side, a vertical transparent shielding is provided at this time, the regular scanning beam can penetrate the transparent shielding, so all the second receiving tubes 201 have signals, the first receiving tube 102 can detect the infrared rays reflected by the elevator door frame and the filter strip, all the first receiving tubes 102 have signals, the first receiving tube 102 close to the transparent shielding has signals, the signals are stronger than the signal intensity reflected by the elevator door frame and the filter strip due to the diffuse reflection of the infrared rays, the signals are in two gradients, the process of judging 4 is performed, if the judging condition of 4.1 is adopted, the difference between the maximum voltage and the minimum voltage is too large, if the judging condition of 4.2 is adopted, the voltage variation amplitude of the first receiving tube 102 close to the edge of the transparent shielding is not satisfied, and if the judging condition of 533.3 is adopted, and the judging condition of the average voltage can not be satisfied, therefore, if the judging condition of the average value of the voltage is adopted is 533.
In the seventh embodiment, as shown in fig. 10, the light curtain TX end 100 and the light curtain RX end 200 are in the middle, the potential diagram of the first receiving tube 102 is on the left, the potential diagram of the second receiving tube 201 is on the right, there is a tilted transparent shielding object, the conventional scanning light beam can penetrate the transparent shielding object, so all the second receiving tubes 201 have signals, the first receiving tube 102 can detect the infrared rays reflected by the elevator door frame and the filter strip, all the first receiving tubes 102 have signals, the first receiving tube 102 close to the transparent shielding object has signals which are stronger than the signal intensity reflected by the elevator door frame and the filter strip due to the fact that the diffuse reflected infrared rays are received, and the signal is stronger as the transparent shielding object is tilted, the potential diagram is close to the first receiving tube 102 of the transparent shielding object, a part of the voltage values is decreasing, a part of the voltage values is flat, and enters the process of judging 4, if the judging condition of 4.1 is adopted, the difference between the maximum voltage value and the minimum voltage value is too large, and if the judging condition of the average value of the voltage value is not large is a-b1＜Ui＜Ua+b1, and the voltage value of the average value is not large enough, and the average value of the voltage value is not equal to that the judging condition of the average value of the U2 is adopted, and the value is not equal to the judging condition of the U2 is adopted, if the average value is higher than the threshold value of the value and 532 and is compared with the threshold value and is judged if the value.
In the eighth embodiment, as shown in fig. 11, the light beam is scanned (black) and reflected (red) by the light curtain TX end 100 and the light curtain RX end 200, the voltage map of the first receiving tube 102 is on the left side, the voltage map of the second receiving tube 201 is on the right side, and no shielding object is present at this time, but the light curtain has an included angle in the range of the vertical angle, so all the second receiving tubes 201 have signals, the first receiving tube 102 has signals, the signal intensity decreases, if the judging condition of 4.1 is adopted, the included angle is limited, and the voltage decreases, but the difference between the maximum value and the minimum value of the voltage is not large, so that the voltage can meet the requirement of U a-b1＜Ui＜Ua+b1, if the judging condition of 4.2 is adopted, the voltage variation range of the first receiving tube 102 is small, so that the voltage can meet the requirement of U i-b2＜Ui+1＜Ui+b2, and if the judging condition of 4.3 is adopted, the average value of the voltage is within the range of the theoretical value of U c±b3 under the distance, so that the voltage can be judged as no shielding object.
In another aspect of the present invention, an elevator light curtain is provided, and it should be noted that, the elevator light curtain provided by the embodiment of the present invention and the method for identifying a transparent, semitransparent, small-volume object provided by the embodiment of the present invention are based on the same inventive concept, so that the implementation of the embodiment can refer to the implementation of the foregoing method for identifying a transparent, semitransparent, small-volume object, and the repetition is omitted.
An elevator light curtain comprising a processor and a memory, wherein at least one instruction is stored in the memory, the instruction being executable by the processor to cause the elevator light curtain to perform the method of identifying transparent, translucent, small-volume objects described in the above embodiments.
In practical application, the light blocking structural member 103 itself or the combination of the circuit board where the light blocking structural member 103 and the first receiving pipe 102 are located forms a cavity with a long and narrow opening facing the light filtering strip, the vertical section of the cavity is in a horn shape with a large outside and a small inside, and the light blocking structural member 103 extends forward to the light filtering strip, so that the first receiving pipe 102 can be prevented from directly receiving infrared rays reflected by the inner surface of the light filtering strip. The long and narrow opening can enlarge the light inlet angle from the vertical direction, reduce the light inlet angle from the horizontal direction, avoid the interference in the horizontal direction, for example, when the elevator is fully loaded, the clothes of people close to the door are easy to reflect infrared rays, and if the horizontal angle is larger, misjudgment is easy to occur.
In practical application, the inner wall of the light blocking member 103 is provided with a reflective coating, and the infrared signal may be reflected by the reflective coating, so as to increase the sensitivity of the first receiving tube 102.
In practical application, the horn-shaped curved surface or inclined surface of the inner wall of the light blocking structural member 103 is provided with a reflective coating, and the left and right sides of the inner wall of the light blocking structural member 103 are not provided with reflective coatings, so that the detection sensitivity of infrared rays from the vertical direction can be enlarged, the detection sensitivity of diffuse reflection infrared rays from the horizontal direction can be reduced, and signal interference in the horizontal direction can be avoided.
In conclusion, the elevator light curtain disclosed by the invention can realize the identification of transparent, semitransparent and small-size objects, is accurate in judgment and has low misjudgment omission judgment probability.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention can be implemented by those skilled in the art without limiting the scope of the invention, therefore, all equivalent changes or modifications that are made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
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| CN202411794449.XA CN119247500A (en) | 2024-12-09 | 2024-12-09 | A method for identifying transparent, semi-transparent, small-volume objects and elevator light curtain |
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| CN1132178A (en) * | 1994-10-25 | 1996-10-02 | 奥蒂斯电梯公司 | Variable beam detection |
| CN101067679A (en) * | 2007-06-12 | 2007-11-07 | 西子奥的斯电梯有限公司 | Reflective single-light source door |
| CN105947851A (en) * | 2016-06-15 | 2016-09-21 | 广州日滨科技发展有限公司 | Obstruction detection and elevator door control methods and systems |
| CN216918247U (en) * | 2021-12-08 | 2022-07-08 | 宁波微科光电股份有限公司 | Elevator light curtain capable of detecting transparent object |
| CN117092719A (en) * | 2023-08-22 | 2023-11-21 | 伟龙意程智能科技(江苏)有限公司 | Elevator light curtain reliability testing device and testing method |
-
2024
- 2024-12-09 CN CN202411794449.XA patent/CN119247500A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132178A (en) * | 1994-10-25 | 1996-10-02 | 奥蒂斯电梯公司 | Variable beam detection |
| CN101067679A (en) * | 2007-06-12 | 2007-11-07 | 西子奥的斯电梯有限公司 | Reflective single-light source door |
| CN105947851A (en) * | 2016-06-15 | 2016-09-21 | 广州日滨科技发展有限公司 | Obstruction detection and elevator door control methods and systems |
| CN216918247U (en) * | 2021-12-08 | 2022-07-08 | 宁波微科光电股份有限公司 | Elevator light curtain capable of detecting transparent object |
| CN117092719A (en) * | 2023-08-22 | 2023-11-21 | 伟龙意程智能科技(江苏)有限公司 | Elevator light curtain reliability testing device and testing method |
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