CN109612508B - Shielding door obstacle secondary detection device for rail transit and detection method thereof - Google Patents
Shielding door obstacle secondary detection device for rail transit and detection method thereof Download PDFInfo
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- 238000005286 illumination Methods 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 2
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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Abstract
The invention relates to the technical field of rail transit equipment and discloses a secondary barrier detection device for a shield door for rail transit. According to the invention, the light beam generator and the photoresistor are arranged, so that when the left door plate and the right door plate are in a state to be closed, the light beam generator and the photoresistor are used for detecting the barrier, the traditional small barrier pressure detection is converted into small barrier shading detection, and therefore, the balance point search for the expected motor current precision of a door speed curve and the voltage correction function of a DCU in a door speed change detection method is avoided, meanwhile, the barrier detection effect is achieved on soft objects, and the potential safety hazard that soft objects such as clothes are clamped in the operation process of the existing shielding door is eliminated.
Description
Technical Field
The invention relates to the technical field of rail transit equipment, in particular to a barrier secondary detection device for a shielded gate for rail transit.
Background
The shield door is used for the rail transit platform more, keeps apart the platform area and the track area each other, and its main function lies in preventing that personnel from falling the track and taking place accident, reduces station air conditioning ventilation system's energy consumption, improves the platform environment of waiting.
The barrier detection system is a key technology of a shield door for guaranteeing passenger safety, has an anti-pinch function, and adopts the prior art to compare the expected motor current and the measured motor current in a door speed curve, namely a single controller in a door control unit DCU uses standard motor current to calculate the pressure applied to the door by the barrier. The DCU controls the speed of the sliding door according to a set speed curve, under the normal condition, the DCU controls the sliding door to move by overcoming the motion resistance of the door, if the actual speed curve of the door does not accord with the set speed curve, the DCU adjusts the voltage variable to control the actual speed curve of the door and the set speed curve to reach a constant value, if the speed of the door is lower than the preset low-speed sensitivity or suddenly reduced speed is monitored, the DCU judges that the door is not generated due to the motion resistance and is blocked by an obstacle, the DCU starts an obstacle program, starts to reversely operate a motor to brake the sliding door, opens the sliding door by about 100mm in width, automatically closes the door again after about 0-10 s (adjustable), if the door still has the obstacle, the door continues to open by 10mm, and if the door fails to close for three times, the door opens to a full-open state, and starts an alarm device above the door.
At present, the thickness of the minimum obstacle detected in the above manner is 4-5 mm, the accuracy requirement is guaranteed by continuously detecting the change of the door speed, the expected motor current accuracy of a door speed curve needs to be improved, the function of correcting the voltage by a DCU is influenced, the balance point of the current and the voltage is difficult to find, meanwhile, for the acceptance work of the screen door, a 4mm × 40mm steel bar is adopted to be clamped in a door seam for detection, the DCU can detect the change of the pressure applied to the door by the obstacle, but for soft objects such as clothes and the like, the operation is not effective, so that the situation that clothes, hair and the like of passengers are clamped frequently occurs, and potential safety hazards exist. Therefore, a secondary barrier detection device for a screen door for rail transit is provided, and aims to solve the problems.
Disclosure of Invention
Aiming at the defects of the existing shield door obstacle detection system in the background technology in the use process, the invention provides the shield door obstacle secondary detection device for rail transit, which has the advantages of making up the precision defects of the traditional obstacle detection system and realizing more accurate detection functions of small obstacles and soft objects, and solves the problem of the precision defects of the detection method for detecting the obstacles due to the change of the door speed in the background technology.
The invention provides the following technical scheme: a secondary barrier detection device of a shield door for rail transit comprises a left door plate and a right door plate, wherein rubber strips are arranged on one side surface of the left door plate opposite to the right door plate, the bottom end of one side of the left door plate is fixedly connected with a base, one side of the right door plate, which is opposite to the left door plate, is provided with a reserved groove, the width of the preformed groove is matched with the width of the base, a light beam generator is fixedly embedded in the middle of the top end of the base, the top end of the light beam generator is fixedly provided with a light-gathering cover, the top end of one side of the left door plate is fixedly connected with a top seat, the bottom end of the top seat is fixedly provided with a photoresistor which is arranged corresponding to the light beam generator, the photoresistor string is connected into the barrier detection system of the left door plate and the right door plate, a contact switch is arranged at the top end of the left door plate, and the contact switch and the light beam generator are connected in series in the control loop.
Preferably, the shape of the light beam emitted by the light beam generator is circular, and the light beam emitted by the light beam generator is completely condensed to the surface of the photoresistor by the light-condensing cover.
Preferably, the contact switch is positioned at one third of the long edge of the top end of the left door panel and close to the top seat.
Preferably, the pre-buried height value of snoot is the depth value of left door plant place slide rail, and the top of snoot flushes with floor or platform floor in the carriage.
A secondary detection method for barrier of a shield door for rail transit comprises the following detection steps:
s1, when the left door panel is closed and runs for two thirds of the length of the left door panel, the contact of the contact switch is conducted, the light beam generator is conducted, and light beam detection is started;
s2, the photoresistor is irradiated by the light beam emitted by the light beam generator, and a change state with small resistance change is generated, so that the current value in the photoresistor is changed;
s3, converting the analog signal into digital signal by the current value generated by the photoresistor through the A/D converter, transmitting the current digital signal to the current change rate calculation unit for current change rate calculation, and transmitting the result to the judgment unit;
s4, the obtained current change rate value eta is compared with a preset value mu by the judging unit, if eta is less than or equal to mu, no obstacle exists between the left door panel and the right door panel, and the left door panel and the right door panel are normally closed; if η > μ, it is determined that an obstacle exists between the left door panel and the right door panel, a specified obstacle program is started, and the process continues to step S2.
Preferably, in step S3, the current change rate calculation unit calculates the current change rate by:
{EMBED Equation.3}
in the formula, eta represents the change of the photoresistor caused by the illumination intensity compared with the light beamRate of change of current when the device is fully illuminated, I0Representing the value of the current, I, generated by the photoresistor when illuminated by the beam generator in the ideal state1Representing the real-time current value passed by the a/D converter to the current rate of change calculation unit.
The invention has the following beneficial effects:
1. according to the invention, the light beam generator and the photoresistor are arranged, so that when the left door plate and the right door plate are in a state to be closed, the light beam generator and the photoresistor are used for detecting the barrier, the traditional small barrier pressure detection is converted into small barrier shading detection, and therefore, the balance point search for the expected motor current precision of a door speed curve and the voltage correction function of a DCU in a door speed change detection method is avoided, meanwhile, the barrier detection effect is achieved on soft objects, and the potential safety hazard that soft objects such as clothes are clamped in the operation process of the existing shielding door is eliminated.
2. The invention adopts the inverted triangle projection method to make the light beam generator irradiate the photoresistor, enlarges the small-sized barrier between the light beam generator and the photoresistor according to the projection, so that the small-sized barrier can cause larger projection of the body area of the small-sized barrier on the surface of the photoresistor under the irradiation action of the light beam generator, thereby obviously weakening the illumination intensity of the photoresistor, reducing the resistance value change of the photoresistor and increasing the current change so as to ensure the precision of the current change rate calculation unit, compared with the traditional infrared transmitting and receiving device for detection, the narrow small obstacle can not cause light path shielding to the infrared transmitting and receiving device, and the method has more accurate detection performance to the small obstacle and the narrow object.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a partial bottom view of a photo resistor according to the present invention;
fig. 4 is a block diagram of the obstacle secondary detection method of the present invention.
In the figure: 1. a left door panel; 2. a right door panel; 3. an adhesive tape; 4. reserving a groove; 5. a base; 6. a light beam generator; 7. a light-gathering cover; 8. a top seat; 9. a photoresistor; 10. a contact switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a shield door obstacle secondary detection device for rail transit comprises a left door plate 1 and a right door plate 2, wherein a rubber strip 3 is arranged on one side surface of the left door plate 1 opposite to the right door plate 2, a base 5 is fixedly connected to the bottom end of one side of the left door plate 1, a reserved groove 4 is formed in one side of the right door plate 2 opposite to the left door plate 1, the reserved groove 4 is arranged to facilitate a small obstacle to be timely positioned between a light beam generator 6 and a photo resistor 9, so as to avoid the obstacle from being erroneously detected due to deviation, the width of the reserved groove 4 is matched with the width of the base 5, the light beam generator 6 is fixedly embedded in the middle of the top end of the base 5, a light-gathering cover 7 is fixedly installed at the top end of the light beam generator 6, a top seat 8 is fixedly connected to the top end of one side of the left door plate 1, the photo resistor 9 is fixedly installed at the bottom end of, the light beam generator 6 and the photoresistor 9 are correspondingly arranged from bottom to top, so as to prevent the problem that the photoresistor 9 is easy to accumulate dust at the lower part to cause the failure of detection sensitivity, the photoresistor 9 is serially connected into the obstacle detection system of the left door panel 1 and the right door panel 2, in the original DCU controller, an A/D converter, a current change rate calculation unit and a judgment unit which are connected with the photoresistor 9 are connected into the loop of the original pressure control system, the obstacle program is controlled by the secondary detection system where the photoresistor 9 is located and the original pressure control system with the same authority, namely the obstacle program is independently controlled by the original pressure control system and the secondary detection system respectively, any system does not accord with the condition, the obstacle program is started, the top end of the left door panel 1 is provided with a contact switch 10, the contact switch 10 and the light beam generator 6 are serially connected into the control loop, the left door panel 1 runs for about, the contact of the contact switch 10 is made conductive, and the light beam generator 6 is energized.
The shape of the light beam emitted by the light beam generator 6 is circular, and the light beam emitted by the light beam generator 6 is completely condensed to the surface of the photoresistor 9 by the light-condensing cover 7, namely, the light beam irradiated to the photoresistor 9 by the light beam generator 6 just forms an inverted cone shape, on one hand, the size of a small obstacle can be projected and amplified by using a projection principle, so that the light shielding effect of the small obstacle is amplified, the photoresistor 9 has a larger projection area relative to the small obstacle, namely a larger shadow area, so that the resistance change of the photoresistor 9 is less influenced, the current change of the photoresistor 9 is small, so that the relative current change rate is larger, namely, the size factor of the small obstacle is amplified by using the projection principle, and the detection precision is improved; on the other hand, the light emitted from the light beam generator 6 can be prevented from irradiating the region other than the top seat 8, and causing dazzling visual influence on the passenger.
Wherein, contact switch 10 is located the one-third department on the long limit in left door plant 1 top and is close to the position of footstock 8, make left door plant 1 all be based on former pressure measurement system operation in the two-thirds stroke in the front, get into back one-third stroke after, left door plant 1 carries out the dual detection effect of former pressure measurement system and secondary detection system, this can save secondary detection system's energy consumption, make secondary detection system only detect little barrier, in addition, contact switch 10's position is set for, can adjust according to former pressure measurement system's precision, make secondary detection system carry out the replenishment that detects the precision to former pressure measurement system in principle.
Wherein, the pre-buried height value of snoot 7 is the degree of depth value of left door plant 1 place slide rail, and the top of snoot 7 flushes with floor or platform floor in the carriage, prevents that newly-increased detecting system equipment from getting on or off the bus to the passenger and producing influences such as stumble foot.
A secondary detection method for barrier of a shield door for rail transit comprises the following detection steps:
s1, the left door panel 1 is closed to run for two thirds of the length of the left door panel, so that the contact of the contact switch 10 is conducted, the light beam generator 6 is electrified and conducted, and light beam detection is started;
s2, the photoresistor 9 is irradiated with the light beam from the light beam generator 6, and a change state in which the resistance is small is generated, thereby causing a change in the current value in the photoresistor 9;
s3, converting the analog signal into digital signal by the current value generated by the photoresistor 9 through the A/D converter, transmitting the current digital signal to the current change rate calculation unit for current change rate calculation, and transmitting the result to the judgment unit;
s4, the obtained current change rate value eta is compared with a preset value mu by the judging unit, if eta is less than or equal to mu, no obstacle exists between the left door panel 1 and the right door panel 2, and the left door panel 1 and the right door panel 2 are normally closed; if η > μ, it is determined that there is an obstacle between the left door panel 1 and the right door panel 2, a specified obstacle routine is started, and the process continues to step S2, in which the preset value μ is an error range value given in consideration of fluctuation in resistance current value between the light beam generator 6 and the photo resistor 9 due to the influence of dust or the like.
In step S3, the current change rate calculation unit calculates the current change rate by:
{EMBED Equation.3}
in the formula, eta represents the current change rate of the photoresistor 9 caused by the change of the illumination intensity compared with the full illumination of the light beam generator 6, I0Represents the value of the current, I, generated by the photoresistor 9 when illuminated by the beam generator 6 in the ideal state1Representing the real-time current value passed by the a/D converter to the current rate of change calculation unit.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides a secondary detection device of shield door barrier for track traffic, includes left door plant (1) and right door plant (2), the relative side of left door plant (1) and right door plant (2) all is equipped with adhesive tape (3), its characterized in that: the bottom end of one side of the left door plate (1) is fixedly connected with a base (5), one side of the right door plate (2) opposite to the left door plate (1) is provided with a reserved groove (4), the reserved groove (4) is arranged to facilitate a small-sized barrier to be timely positioned between a light beam generator (6) and a photoresistor (9), so that the situation that the barrier is mistakenly detected due to deviation is avoided, the width of the reserved groove (4) is matched with that of the base (5), the middle part of the top end of the base (5) is fixedly embedded with the light beam generator (6), the top end of the light beam generator (6) is fixedly provided with a light-gathering cover (7), the top end of one side of the left door plate (1) is fixedly connected with a top seat (8), the bottom end of the top seat (8) is fixedly provided with the photoresistor (9), the photoresistor (9) is arranged corresponding to the light beam generator (6), the light beam generator (6, the photoresistor (9) is connected in series into the barrier detection system of the left door panel (1) and the right door panel (2), in the original DCU controller, an A/D converter, a current change rate calculation unit and a judgment unit which are connected with a photoresistor (9) are connected into a loop of an original pressure control system, a secondary detection system where the photoresistor (9) is located and the original pressure control system control an obstacle program with the same authority, namely, the original pressure control system and the secondary detection system respectively and independently control the barrier program, any system does not meet the conditions, the barrier program is started, the top end of the left door panel (1) is provided with a contact switch (10), the contact switch (10) and the light beam generator (6) are connected in series in a control loop, the left door panel (1) runs two thirds of the travel, the contact of the contact switch (10) is conducted, so that the light beam generator (6) is electrified and conducted;
the shape of the light beam emitted by the light beam generator (6) is circular, and the light beam emitted by the light beam generator (6) is completely condensed to the surface of the photosensitive resistor (9) by the light-condensing cover (7), namely, the light beam irradiated to the photosensitive resistor (9) by the light beam generator (6) just forms an inverted cone;
the contact switch (10) is positioned at one third of the long edge of the top end of the left door panel (1) and is close to the top seat (8), so that the left door panel (1) operates based on an original pressure detection system in the front two thirds of stroke, and after the left door panel (1) enters the rear one third of stroke, the left door panel (1) performs double detection of the original pressure detection system and the secondary detection system;
wherein, the pre-buried height value of snoot (7) is the degree of depth value of left door plant (1) place slide rail, and the top of snoot (7) and floor or platform floor flush in the carriage.
2. The method for detecting the secondary barrier detection device of the screen door for rail transit according to claim 1, comprising the following steps:
s1, closing the left door panel (1) to run for two thirds of the length of the left door panel, so that the contact of the contact switch (10) is conducted, the light beam generator (6) is electrified and conducted, and light beam detection is started;
s2, the photoresistor (9) is irradiated by the light beam emitted by the light beam generator (6), and a change state with small resistance change is generated, so that the current value in the photoresistor (9) is changed;
s3, converting the analog signal into a digital signal by the current value generated by the photoresistor (9) through an A/D converter, transmitting the current digital signal to a current change rate calculation unit for current change rate calculation, and transmitting the result to a judgment unit;
s4, the obtained current change rate value eta is compared with a preset value mu by the judging unit, if eta is less than or equal to mu, no obstacle exists between the left door panel (1) and the right door panel (2), and the left door panel (1) and the right door panel (2) are normally closed; if η > μ, it is determined that an obstacle is present between the left door panel (1) and the right door panel (2), a specified obstacle program is started, and the process proceeds to step S2.
3. The method for detecting the secondary barrier detection device of the screen door for rail transit as claimed in claim 2, wherein: in step S3, the current change rate calculation unit calculates the current change rate by:
wherein eta represents the current change rate of the photoresistor (9) due to the change of the illumination intensity compared with the full illumination of the light beam generator (6), I0Represents the current value I generated when the photoresistor (9) is irradiated by the light beam generator (6) in an ideal state1Representing the real-time current value passed by the a/D converter to the current rate of change calculation unit.
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| CN111812738B (en) * | 2020-06-19 | 2024-01-12 | 柳州科路测量仪器有限责任公司 | Secondary detection device and detection method for barrier of shielding door for rail transit |
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