CN115947193A - Novel elevator flat bed photoelectric sensor - Google Patents

Abstract

The invention relates to the related technical field of photoelectric sensing, and discloses a novel elevator flat-layer photoelectric sensor.A set of receiving and amplifying circuits is used for skillfully utilizing peak staggering driving in a pulse idle period, so that the response time can be consistent with a single light beam, a light standby can easily exceed 2500 percent after a reflecting refractor is omitted, the product assembly is simpler and faster, the productivity is effectively improved, the cost is saved, and the interference of infrared signals of a remote controller and the like can be shielded by detecting and identifying peak staggering driving pulses.

Description

Novel elevator flat bed photoelectric sensor

Technical Field

The invention relates to the technical field related to photoelectric sensing, in particular to a novel elevator flat-layer photoelectric sensor.

Background

The photoelectric sensor applied to the elevator flat floor at present is a groove type induction device manufactured by applying the principle of transmitting and receiving infrared beams, and is a very important sensor in an elevator. The assembly reciprocates along with elevator car in elevator car bottom, and when reacing the floor of preselection, the baffle of fixed assembly in corresponding floor gets into the notch of leveling sensor, has sheltered from the infrared light beam of normal receiving and dispatching, and the back is sheltered from to inside chip detection light beam, informs output circuit output corresponding information and gives the elevator host computer, just knows after the host computer receives the information that has arrived certain floor, and control car stops.

In order to adapt to more complex application scenarios, many large elevator manufacturers need a 3-axis level sensor, for example, fig. 8 and 2,3 have 3 optical axes, i.e., 3 transceiver tubes, 3 beams, and correspondingly 3 output signals, and a circuit board 4 is installed in the housing 1. The main technical bottlenecks of the single optical axis system include mutual interference of optical axes, long response time, no optical standby performance exceeding 2500%, 3 sets of infrared signal amplifying circuits required by a receiving part, and the like. In the last few years, 3-axis products have relied primarily on import, which is the mainstream import photoelectric horizon sensor to solve. 3 bundle of transmitted light is not direct transmission to the receipt, but launches a reflection of light refractor earlier, launches for receiving arrangement after this mirror surface refraction, and the receiving segment also sets up a set of reflection of light refractor, and reflection of light refracts for the receiver tube after the mirror surface receives the beam again, has increased 2 sets of reflection of light refractor in the light path, and the purpose is in order to reduce the mutual interference degree at reduction beam intensity. As shown in fig. 2,3 sets of independent receiving and amplifying circuits are adopted to simultaneously receive and process 3 beams of light, so as to ensure that the response time can reach within 1 ms. However, because the light beam path is added with the reflection and refraction part, the light transmission is attenuated, so that the light reserve cannot exceed 2500%, more importantly, the requirements of manufacturing and assembling processes of the reflection and refraction mirror are high, the consistency of the product is difficult to control, and the bottleneck of improving the productivity is also realized; such design requires 3 sets of independent amplification circuits, increasing product volume and also increasing cost.

In addition, elevator flat bed photoelectric sensor can accumulate a large amount of dust in the long-term in-process of using, and these shelter from light emitter and light receiver very easily, and elevator flat bed photo-sensor finally became invalid.

Disclosure of Invention

Aiming at the defects of the existing elevator flat-layer light sensor in the background technology in the using process, the invention provides a novel elevator flat-layer photoelectric sensor which has the advantages of improving the productivity and saving the cost, and solves the technical problems in the background technology.

The invention provides the following technical scheme: a novel elevator flat-layer photoelectric sensor comprises the following operation modes:

s1, alternately driving transmitting ends in each period, namely uniformly distributing driving pulses in each period, wherein the pulse interval is T/3, and a microcontroller opens a rising edge capturing function and a falling edge capturing function and is provided with a timer;

s2, in each period, the microcontroller opens a No. 1 receiving channel of the 1-out-of-3 electronic switch while sending the No. 1 transmission, and captures the received pulse width;

s3, turning off the No. 1 transmission;

s4, the receiving end captures the pulse number again;

s5, if the pulse is received, judging that the infrared light interference exists, and if the pulse is not received, judging that the pulse is normal;

s6, alternately switching the 1-out-of-3 electronic switch to the No. 2 receiving channel, the No. 3 receiving channel, the corresponding No. 2 transmitting driving pulse and the No. 3 transmitting driving pulse, and capturing the pulse width and the pulse number as the No. 1 receiving channel;

and S7, after 2 continuous periods, respectively comparing the stored period data, namely t1\ t2\ t3=4.5-5.5uS, and the pulse number of each path is 1, if the pulse number of each path is in accordance with the 2 characteristic conditions, determining that a normal emission beam is received, informing a corresponding channel to output a non-shielding state signal by the microcontroller, if the pulse number of each path is greater than 1, determining that an interference beam exists, the period is ignored, and if the pulse number of a certain 1 path of 2 continuous periods is 0, determining that the beam is shielded, and informing the corresponding channel to output a shielding state signal by the microcontroller.

Preferably, the capturing mode of the microcontroller for the pulse is that when the receiving end receives a rising edge of the pulse, the capturing function of the microcontroller triggers a configured timer to start timing, and stops timing until a falling edge is captured, and stores a time data t value, and every time there is a pair of the rising edge and the falling edge, the pulse count is increased by 1, that is, the pulse count is recorded as 1 pulse.

Preferably, the values of the period T and the pulse width T1\ T2\ T3 are selected according to the frequency characteristics of the whole circuit system, the frequency is selected to be f =5kHz, and the period T =1/f =200uS.

Preferably, the 3-path emission driving is performed in a time-sharing manner, and the No. 2 driving pulse and the No. 3 driving pulse are inserted into the idle period of the No. 1 emission driving pulse, and a time-sharing driving mechanism is adopted to avoid mutual interference between the light beams 2.

Preferably, the driving period of the single optical axis emitting the driving pulse number 1 is T, and if the microcontroller determines that the light beam 2 is in the shielding state after detecting no light beam 2 for 2 consecutive periods, the response time is about 2T and is within 1 ms.

Preferably, the receiving ends share a set of receiving amplifying circuit, the microcontroller selectively switches on the corresponding receiving lamp tube by controlling the CBA port according to the transmitting time sequence, and then transmits the photoelectric conversion signal of the lamp tube to the receiving amplifying circuit, and the amplified signal is identified and processed by the microcontroller.

The utility model provides a novel elevator flat bed photoelectric sensor deashing light disturbance prevention equipment, the inner wall both sides of casing are provided with the transmitting terminal and the receiving terminal of symmetry respectively, the inner wall movable mounting of casing has the light screen, and the upper and lower both ends of light screen all are equipped with the inclined plane, the light screen activity sets up between the transmitting terminal, one side fixed mounting of light screen has the catch bar that is located the casing, and the lateral wall fixed mounting of catch bar has the push rod that resets, the top fixed mounting of push rod that resets has anti-reverse ball, and the inner wall movable mounting of casing has the imbibition piece that is located anti-reverse ball top, anti-thrust chute way has been seted up to the inboard of imbibition piece, and the bottom of imbibition piece with prevent sliding connection between the reverse ball, when the imbibition piece received self moderate force downward movement, impel the light screen laminating to be in the same place through reset push rod and catch bar activity.

Preferably, the top end of the push rod is fixedly provided with an air pressing plate, the inner side of the shell is provided with an air pressure cavity, the air pressing plate is movably arranged in the air pressure cavity, the inner wall of the shell is provided with an air transmission channel communicated with the air pressure cavity, the inner side of the shell is movably provided with a fan column positioned below the receiving end, the outer side of the fan column is fixedly provided with cleaning blades for cleaning the surface of the receiving end, the number of the cleaning blades is three, the three cleaning blades are arranged at equal angles by taking the central axis of the fan column as the center, one side of the fan column is fixedly provided with fan blades, one end of the air transmission channel is positioned at one side of the fan blades, and the fan blades are driven to rotate by air flow output by the air transmission channel.

Preferably, the inner cavity of the cleaning blade is provided with a liquid storage cavity, a liquid squeezing plug is movably mounted in the liquid storage cavity, the inner side of the cleaning blade is provided with a liquid discharge channel communicated with the liquid storage cavity, the inner wall of the shell is provided with a liquid conveying channel communicated with the liquid discharge channel, the liquid storage cavity is filled with sufficient media, and one end of the liquid conveying channel is positioned below the liquid suction block.

Preferably, the inner wall fixed mounting of imbibition piece has the fender frame that is arranged in the anti-chute way that pushes away, and keeps off the slope of frame and arranges in the anti-chute way that pushes away, and the direction of the anti-chute way that pushes away of the highest tip slope that keeps off the frame, the inner wall movable mounting of imbibition piece has the simple pendulum piece that is located anti-chute way and keeps off a tip juncture, the cross sectional shape of simple pendulum piece is the calabash shape, the flabellum slope is arranged at the fan post, the quantity of flabellum has eight at least, and the lateral wall and the gas transmission way tip sliding connection of flabellum, is provided with on the fan post and keeps away empty region, and clean leaf can make empty region along with the fan post rotate to gas transmission way department after the medium increases in the deposit liquid chamber.

The invention has the following beneficial effects:

1. according to the invention, by means of a set of receiving and amplifying circuit, peak staggering driving in a pulse idle period is skillfully utilized, so that the response time can be consistent with that of a single light beam, a light standby can easily exceed 2500% after a reflection refractor is omitted, the product assembly is simpler and faster, the productivity is effectively improved, the cost is saved, and the interference of infrared signals of a remote controller and the like can be shielded by detecting and identifying peak staggering driving pulses.

2. The light shielding plate is arranged, so that when the light shielding plate extends out, adjacent single light beam transmission circuits in the transmitting end and the receiving end are blocked, the situation that corresponding received channels cannot interfere with each other is avoided, and meanwhile, after the light shielding plate is pushed by the blocking piece, the fan column can be promoted to drive the cleaning blade to rotate, so that the cleaning blade wipes the transmitting end and the receiving end, and the phenomenon of induction failure caused by dust accumulation is avoided.

3. According to the invention, the liquid squeezing plug is arranged in one of the cleaning leaves, so that after the light screen is separated from the baffle, a medium is quickly injected into the liquid storage cavity, the cleaning leaves cannot shield the receiving end, and the sensing between the transmitting end and the receiving end cannot be influenced.

Drawings

FIG. 1 is a block diagram illustrating a transceiving cycle of the present invention;

FIG. 2 is a schematic diagram of a conventional 3-axis amplifying circuit;

FIG. 3 is a block diagram of the junction circuit of the present invention;

FIG. 4 is a schematic diagram of the transmit drive pulse of the present invention;

FIG. 5 is a schematic diagram of a receiving switch selection circuit according to the present invention;

FIG. 6 is a schematic view of the direct 3-way beam of the present invention;

FIG. 7 is a schematic diagram of pulse transmission and reception according to the present invention;

FIG. 8 is a schematic view of a conventional 3-axis optical lens;

FIG. 9 is a schematic view of a housing with a visor according to the present invention;

FIG. 10 is a schematic top view of the present invention;

FIG. 11 isbase:Sub>A schematic cross-sectional view taken at A-A of FIG. 10 in accordance with the present invention;

FIG. 12 is a schematic cross-sectional view taken at B-B of FIG. 10 in accordance with the present invention;

FIG. 13 is a schematic view of a fan blade of the present invention.

In the figure: 1. a housing; 100. a pneumatic chamber; 101. an air delivery passage; 102. a reverse push chute channel; 103. an infusion channel; 2. a light beam; 3. a catadioptric mirror; 4. a circuit board; 5. a transmitting end; 501. transmitting No. 1; 502. transmitting No. 2; 503. transmitting No. 3; 6. a receiving end; 601. receiving No. 1; 602. receiving No. 2; 603. receiving No. 3; 7. 1-out-of-3 electronic switch; 8. a receiving amplifying circuit; 9. a microcontroller; 10. a fan column; 11. cleaning the leaves; 12. a visor; 13. a push rod; 14. a gas pressing plate; 15. resetting the push rod; 150. a check ball; 16. a single pendulum block; 17. a blocking frame; 18. a fan blade; 19. a liquid squeezing plug; 20. a liquid storage cavity; 21. a drainage channel; 22. and (4) sucking the liquid block.

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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 4, in the novel elevator leveling photoelectric sensor, the values of the period T and the pulse width T1\ T2\ T3 are selected according to the frequency characteristics of the whole circuit system, and the selected frequency f =5kHz is the best working state, so the period T =1/f =200uS. In consideration of the service life, energy conservation and capturing reliability of the infrared transceiver tube, through a large number of experiments, the optimal lighting time per period, namely the value of the pulse width t, is 5uS.

Referring to fig. 4 and 3, the 3-channel transmission driving is performed in a time-sharing manner, and the No. 2 driving pulse and the No. 3 driving pulse are inserted into the idle period of the No. 1 transmission driving pulse. The time-sharing driving mechanism is adopted to avoid mutual interference between the light beams 2, for example, when the No. 1 emission 501 is driven, the No. 2 emission 502 and the No. 3 emission 503 are closed, so that the No. 2 receiving 602 and the No. 3 receiving 603 do not interfere with the No. 1 receiving 601. Before the transmission 501 of number 1, the microcontroller 9 will inform the 1-from-3 electronic switch 7 to turn on the reception 601 of number 1, see fig. 5, and send the received signal to the reception amplifying circuit 8 for amplification. At this time, the No. 2 receiver 602 and the No. 3 receiver 603 are in an off state, and do not interfere with the signal of the No. 1 receiver 601 channel. Therefore, the design avoids adding devices such as a catadioptric mirror 3 and the like in the light path to attenuate the light intensity so as to achieve the purpose of reducing mutual interference.

Referring to fig. 4, in which the driving period of the single optical axis emitting the driving pulse number 1 is T, if the microcontroller 9 determines that the light beam 2 is in the shielding state after detecting no light beam 2 for 2 consecutive periods, the response time is about 2T, and is usually within 1 ms. It can be seen from fig. 4 that the light beams 2 of emission No. 3 503 and emission No. 2 502 are arranged in the idle period of emission No. 1 501, so the response time of the entire 3-axis is not affected, again about 2T. The microcontroller 9 can switch the corresponding receiving end 3 to select 1 electronic switch 7 channel according to the different groups of emission driving pulses, and records the shielding or non-shielding times of the corresponding channel so as to control the corresponding output circuit to output the shielding or non-shielding signal state to the elevator host.

Based on the above processing mechanism, the configuration of the 2-socket receiving and expanding circuit 8 can be omitted, see that the transmission 501 of 6,1 is directly transmitted to the reception 601 of number 1, no loss exists in the middle, and the optical standby performance can be effectively improved: the optical standby is to use an optical filter with certain transmittance to infrared wavelength to shield the optical filter on an optical axis between the receiving and transmitting ends, and the product does not have abnormality when working. If the filter has a 4% transmission, the light backup is 2500%.

Referring to fig. 5, a receiving end 6 is adopted to share a set of receiving amplifier circuits 8. The microcontroller 9 selectively switches on the corresponding receiving lamp tube by controlling the CBA port according to the transmitting time sequence, and then transmits the photoelectric conversion signal of the lamp tube to the receiving amplifying circuit 8 for the microcontroller 9 to recognize and process after amplification. The cost can be effectively reduced by reducing the receiving amplifying circuit 8, the miniaturization design of the product is convenient to realize, and the reliability is improved.

Referring to fig. 4, according to the above-mentioned transceiving mechanism and the pulse width t1\ t2\ t3 and number of the driving pulse, the receiving end performs capturing operation on the received pulse, and if the received pulse does not meet the condition, it is determined that the interference signal does not process the output. By comparing the received pulse characteristics with a receiving and transmitting processing mechanism, interference suppression such as an infrared remote controller can be realized.

As can be seen from fig. 7, the emitting terminals 5 are alternately driven every period, i.e. the driving pulses are uniformly distributed in each period, and the pulse interval is T/3. The microcontroller 9 turns on the rising and falling edge capture functions and configures the timer. For the purpose of noise immunity, in each cycle, the microcontroller 9 will turn on the receive channel No. 1 601 of the 1-out-of-3 electronic switch 7 at the same time as sending the transmit No. 1 signal 501, and capture the received pulse width. Then, the number 1 transmission 501 is turned off, the receiving end captures the number of pulses again, and at this time, if the pulses are received, it is determined that there is infrared light interference, and if the pulses are not received, the receiving end is normal. And by analogy, the 1-out-of-3 electronic switch 7 is switched to the No. 2 receiving channel 602 and the No. 3 receiving channel 603 in turn, and the corresponding No. 2 transmitting driving pulse and the No. 3 transmitting driving pulse are correspondingly switched, and the pulse width and the pulse number are captured as in the No. 1 channel. After 2 continuous periods, the stored period data are respectively compared, namely t1\ t2\ t3=4.5-5.5uS and the pulse number of each path is 1, if the 2 characteristic conditions are met, the normal emission light beam 2 is considered to be received, and the microcontroller 9 informs the corresponding channel to output a non-shielding state signal. If the number of pulses per path is larger than 1, the interference light beam is considered to be present, and the period is ignored. If the pulse number of a certain 1 path in 2 continuous periods is 0, the light beam 2 is judged to be shielded, and the microcontroller 9 informs the corresponding channel to output a shielding state signal, referring to fig. 1.

The capturing mode of the microcontroller 9 for the pulse is such that when the receiving end 6 receives the rising edge of the pulse, the capturing function of the microcontroller 9 triggers a configured timer to start timing, and stops timing until the falling edge is captured, and stores the time data t value. Each pair of rising and falling edges, the pulse count is incremented by 1, i.e., by 1 pulse.

Referring to fig. 9-13, for ash removal and light interference prevention of a flat sensor, two sides of an inner wall of a housing 1 are respectively provided with a transmitting end 5 and a receiving end 6 which are symmetrical, wherein a light shielding plate 12 is movably mounted on the inner wall of the housing 1, and inclined planes are respectively arranged at upper and lower ends of the light shielding plate 12, so that the light shielding plate 12 can be opened by pressing with a baffle plate of an elevator after the light shielding plate 12 contacts with the baffle plate of the elevator, the light shielding plate 12 is made of a light shielding material, and the light shielding plate 12 is movably arranged between the transmitting end 5, so that when single-beam light sensing is performed between the transmitting end 5 and the receiving end 6, light beam interference between adjacent light shielding plates is avoided by shielding the light shielding plate 12, and in an actual application process, a light shielding plate can be arranged between the light shielding plates 12, so that the transmitting end 5 outputs a box body wrapped by light beams, and interference of external light beams can be prevented.

The pushing rod 13 positioned in the shell 1 is fixedly arranged on one side of the shading plate 12, the reset push rod 15 is fixedly arranged on the side wall of the pushing rod 13, the anti-reverse ball 150 is fixedly arranged at the top end of the reset push rod 15, the anti-reverse ball 150 is a sphere, the liquid suction block 22 positioned above the anti-reverse ball 150 is movably arranged on the inner wall of the shell 1, the anti-reverse sliding channel 102 is arranged on the inner side of the liquid suction block 22, the bottom of the liquid suction block 22 is in sliding connection with the anti-reverse ball 150, when the liquid suction block 22 moves downwards under the self-neutral force, the shading plate 12 can be driven to be attached together through the movement of the reset push rod 15 and the pushing rod 13, the shading plate 12 is ensured to be in a separated state after being separated from the shading plate, the air pressing plate 14 is fixedly arranged at the top end of the pushing rod 13, the air pressure cavity 100 is arranged on the inner side of the shell 1, and the air pressing plate 14 is movably arranged in the air pressure cavity 100, when the pushing rod 13 pushes the air pressing plate 14 to move in the air pressure cavity 100, the air flow reserve in the air pressure cavity 100 is changed along with the movement of the air pressing plate 14, the inner wall of the shell 1 is provided with the air transmission channel 101 communicated with the air pressure cavity 100, the inner side of the shell 1 is movably provided with the fan column 10 positioned below the receiving end 6, the lower part of the transmitting end 5 is also provided with the fan column 10 in the same way as the fan column 10 positioned below the receiving end 6, the outer side of the fan column 10 is fixedly provided with the cleaning blades 11 for cleaning the surface of the receiving end 6, the number of the cleaning blades 11 is three, the three cleaning blades 11 are arranged at equal angles by taking the central axis of the fan column 10 as the center, one side of the fan column 10 is fixedly provided with the fan blade 18, one end of the air transmission channel 101 is positioned at one side of the fan blade 18, and the fan column 10 is driven to rotate by the air flow output by the air transmission channel 101, when guaranteeing with this that the air current in the air delivery way 101 outwards spits out for fan post 10 drives clean leaf 11 and rotates, realize the dust clearance on receiving terminal 6 and transmitting terminal 5, and establish clean leaf 11 as the printing opacity material, guaranteed the in-process that clean leaf 11 cleaned receiving terminal 6, do not cause the influence to receiving terminal 6's work, and be in the state that the baffle sheltered from receiving terminal 6 and transmitting terminal 5 through receiving terminal 6 when clear process, therefore, to receiving terminal 6 and transmitting terminal 5's cleanness this moment, the phenomenon of misdelivery signal between transmitting terminal 5 and the receiving terminal 6 has also been reduced.

A liquid storage cavity 20 is formed in the inner cavity of one cleaning blade 11, a liquid squeezing plug 19 is movably mounted in the liquid storage cavity 20, a liquid discharging channel 21 communicated with the liquid storage cavity 20 is formed in the inner side of the cleaning blade 11, a liquid conveying channel 103 communicated with the liquid discharging channel 21 is formed in the inner wall of the shell 1, at the moment, a liquid flow channel for communicating the liquid discharging channel 21 with the liquid conveying channel 103 is formed in the fan column 10, a sufficient amount of medium can be filled in the liquid storage cavity 20, the medium can be water or oil, one end of the liquid conveying channel 103 is located below the liquid suction block 22, so that suction on the liquid storage cavity 20 is formed in the process that the liquid suction block 22 moves up and down, after the medium is sucked out from the liquid storage cavity 20, the weight between the cleaning blades 11 is kept level, rotation is easy to carry out, meanwhile, after the medium is filled in the liquid storage cavity 20, the gravity of a single cleaning blade 11 can be increased, and when the cleaning blade 11 is directed reversely by the gravity, the other two cleaning blades 11 cannot shield the transmitting end 5 and the receiving end 6, so that the transmitting end is not shielded by the receiving end and the signal transmission accuracy is reduced in the receiving end in the process.

The inner wall of the liquid suction block 22 is fixedly provided with the baffle frames 17 positioned in the reverse thrust sliding chute 102, the baffle frames 17 are obliquely arranged in the reverse thrust sliding chute 102, the number of the baffle frames 17 is two, the two baffle frames 17 are symmetrically arranged, the distance between the two baffle frames 17 is smaller than the sphere diameter of the anti-reverse ball 150 and is larger than the diameter of the reset push rod 15, the highest end part of the baffle frame 17 is inclined to the direction of the reverse thrust sliding chute 102, the inner wall of the liquid suction block 22 is movably provided with the single pendulum block 16 positioned at the junction part of the reverse thrust sliding chute 102 and the end part of the baffle frame 17, the cross section of the single pendulum block 16 is in a gourd shape, so that when the anti-reverse ball 150 is output from the reverse thrust sliding chute 102, the anti-reverse ball 150 can only realize the one-way transmission of outward movement through the reverse thrust sliding chute 102 through the blocking of the single pendulum block 16, and through the slope of the end of the blocking frame 17, when the anti-reverse ball 150 moves along the blocking frame 17, the liquid absorbing block 22 is rapidly jacked up due to the inclined part, and it is also ensured that when the light shielding plate 12 is inwardly contracted by the blocking plate, the upward movement stroke of the liquid absorbing block 22 is increased, so that the medium in the liquid storage cavity 20 is rapidly pumped out, and the cleaning blade 11 is more easily rotated according to the airflow generated by the movement of the air pressing plate 14, meanwhile, after the anti-reverse ball 150 is arranged in the reverse thrust sliding channel 102, the liquid absorbing block 22 is firstly made to fall down, so that after the light shielding plate 12 is separated from the blocking plate, the medium is rapidly filled in the liquid storage cavity 20, so that the cleaning blade 11 cannot be shielded, and after the light shielding plate 12 is separated from the blocking plate, the transmitting end 5 and the receiving end 6 can rapidly perform detection.

The fan blades 18 are obliquely arranged on the fan column 10, the number of the fan blades 18 is at least eight, and the side walls of the fan blades 18 are connected with the end part of the air transmission channel 101 in a sliding manner, so that when the air flow in the air transmission channel 101 blows the fan blades 18 to rotate, the air flow is blocked by the fan blades 18, the output air flow in the air transmission channel 101 is reduced, when the air pressure plate 14 continuously presses the air pressure cavity 100, the pressure in the air pressure cavity 100 is increased, and an air avoiding area is arranged on the fan column 10, so that after the medium in the liquid storage cavity 20 is increased, the air avoiding area can rotate to the air transmission channel 101 along with the fan column 10, namely when the air pressure plate 14 in the air pressure cavity 100 sucks air inwards, the air can quickly enter the air in the air transmission channel 101 through the air avoiding area, and the resistance phenomenon caused by slow air entering is avoided.

The working principle of the invention is as follows: the shell 1 is installed outside the elevator and moves along with the elevator, then, after the shell 1 reaches the corresponding floor, the baffle of the corresponding floor can be contacted with the end part of the light screen 12, the light screen 12 can move towards the inner cavity of the shell 1 by pressing the light screen 12, and when the push rod 13 moves, the reset push rod 15 can be pushed to move towards the direction of the air compressing plate 14, the reset push rod 15 can move towards the right side along the baffle frame 17, the direction is amplified by referring to the right side of the attached drawing 11, the anti-reverse ball 150 can jack the baffle frame 17, so that the liquid absorbing block 22 moves upwards, the pressure at the position of the liquid conveying channel 103 is reduced, the medium in the liquid storage cavity 20 is sucked through the liquid discharging channel 21, the liquid squeezing plug 19 moves towards the outside, and the medium in the liquid storage cavity 20 is pumped out at the moment, so that the cleaning blade 11 is equal to the gravity of other cleaning blades 11, and the phenomenon that the cleaning blade 11 is overweight alone cannot occur.

Meanwhile, when pushing away air pressing plate 14 through catch bar 13 right, air pressing plate 14 extrusion atmospheric pressure chamber 100 can make the air current from the quick output in air transmission duct 101, the air current of air transmission duct 101 can be blown on flabellum 18, make flabellum 18 drive fan post 10 rotate, fan post 10 drives clean leaf 11 and cleans transmitting terminal 5 and receiving terminal 6, and this moment, transmitting terminal 5 and receiving terminal 6 all are sheltered from by the baffle, therefore clean it can not influence its operating condition this moment to it, and simultaneously, clean leaf 11 itself is established to the printing opacity material, the influence of cleaning the in-process and sheltering from has also been avoided.

When the airflow in the air transmission channel 101 is continuously blown to the reset push rod 15, the fan blade 18 moves to the end of the air transmission channel 101 to partially shield the air transmission channel 101, so that the airflow in the air pressure cavity 100 is not completely output, the airflow in the air transmission channel 101 is pressurized to rotate the fan blade 18, and the cleaning strength is accelerated.

After the housing 1 is pushed to the rightmost side of the reverse-push chute channel 102 by the baffle, the anti-reverse ball 150 can slide into the right side of the 120 from the right end of the baffle frame 17, at this time, due to the intervention of the baffle, the anti-reverse ball 150 is always positioned on the right side of the reverse-push chute channel 102, after the light shielding plate 12 is separated from the baffle through the movement of the elevator, the anti-reverse ball 150 can move according to the top of the reverse-push chute channel 102 by being pressed down by the gravity of the liquid suction block 22, at this time, the liquid suction block 22 pushes the anti-reverse ball 150 to move to the left side, and when moving down through the liquid suction block 22, the medium at the bottom of the liquid suction block 22 can be quickly pressed into the liquid storage cavity 20 through the liquid conveying channel 103, so that the weight of one cleaning blade 11 is increased, the cleaning blade 11 with the liquid storage cavity 20 is forced to be in a vertically downward state, at this time, the air avoiding area existing on the fan column 10 can correspond to the air conveying channel 101, so that the external air flow can be communicated with the air pressure chamber 100, the air pressure plate 14 can be easily separated from the pushing rod 13, and the light shielding plate 12 can be pushed out again through multiple light shielding plates 2.

The liquid suction block 22 is continuously pushed downwards, so that the anti-inverse ball 150 passes through the simple pendulum block 16, the simple pendulum block 16 is driven to rotate, the anti-inverse ball 150 moves to the end part of the blocking frame 17, and after the anti-inverse ball 150 is far away from the simple pendulum block 16, the simple pendulum block 16 deflects by self gravity, so that the anti-inverse ball 150 cannot return to the anti-push sliding channel 102 from the simple pendulum block 16, and when the subsequent light shielding plate 12 is pushed by the blocking plate again, the anti-inverse ball 150 is limited by the end parts of the simple pendulum block 16 and the blocking frame 17, so that the anti-inverse ball 150 can move along the blocking frame 17 again, and the above steps are realized.

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 (10)

1. The utility model provides a novel elevator flat bed photoelectric sensor which characterized in that, includes following operational mode:

s1, alternately driving transmitting terminals (5) in each period, namely uniformly distributing driving pulses in each period, wherein the pulse interval is T/3, starting a rising edge capturing function and a falling edge capturing function by a microcontroller (9) and configuring a timer;

s2, in each period, the microcontroller (9) can open a No. 1 receiving (601) channel of the 1-from-3 electronic switch (7) while sending the No. 1 transmission (501), and capture the received pulse width;

s3, turning off the No. 1 transmission (501);

s4, capturing the pulse number again by the receiving end;

s5, judging that infrared light interference exists if the pulse is received, and judging that the pulse is normal if the pulse is not received;

s6, alternately switching a 1-out-of-3 electronic switch (7) to a No. 2 receiving channel (602) and a No. 3 receiving channel (603) and corresponding No. 2 transmitting driving pulse and No. 3 transmitting driving pulse, and capturing the pulse width and the pulse number as the No. 1 receiving channel (601);

s7, after 2 continuous periods, comparing the stored period data respectively, namely t1\ t2\ t3=4.5-5.5uS, the pulse number of each path is 1, if the 2 characteristic conditions are met, a normal emission light beam (2) is considered to be received, the microcontroller (9) informs a corresponding channel to output a non-shielding state signal, if the pulse number of each path is larger than 1, an interference light beam is considered to exist, the period is ignored, if the pulse number of 1 path in 2 continuous periods is 0, the light beam (2) is judged to be shielded, and the microcontroller (9) informs the corresponding channel to output a shielding state signal.

2. The novel elevator flat-bed photoelectric sensor according to claim 1, characterized in that: the microcontroller (9) captures the pulse in a manner that when the receiving end (6) receives the rising edge of the pulse, the microcontroller (9) triggers a configured timer to start timing, the timing is stopped until the falling edge is captured, time data t values are stored, and 1 is added to the pulse count when each pair of the rising edge and the falling edge exists, namely, the pulse count is recorded as 1 pulse.

3. The novel elevator flat-bed photoelectric sensor according to claim 1, characterized in that: the values of the period T and the pulse width T1\ T2\ T3 are selected according to the frequency characteristics of the whole circuit system, the selected frequency is f =5kHz, and the period T =1/f =200uS.

4. The novel elevator flat-bed photoelectric sensor according to claim 1, characterized in that: the 3-path emission driving is carried out in a time-sharing mode, the No. 2 driving pulse and the No. 3 driving pulse are inserted into the idle time period of the No. 1 emission driving pulse, and a time-sharing driving mechanism is adopted to avoid mutual interference among the light beams 2.

5. The novel elevator flat bed photoelectric sensor of claim 1, characterized in that: the driving period of the single optical axis emitting the driving pulse No. 1 is T, if the microcontroller (9) judges that the light beam 2 is in a shielding state after detecting the light beam 2 for 2 continuous periods, the response time is about 2T and is within 1 ms.

6. The novel elevator flat-bed photoelectric sensor according to claim 1, characterized in that: the receiving ends (6) share one set of receiving amplifying circuit (8), the microcontroller (9) selectively switches on the corresponding receiving lamp tube by controlling the CBA port according to the transmitting time sequence, and then transmits the photoelectric conversion signal of the lamp tube to the receiving amplifying circuit (8), and the amplified signal is identified and processed by the microcontroller (9).

7. A novel ash removal and optical disturbance prevention device for the elevator flat-bed photoelectric sensor, which is used in any one of claims 1 to 6, is characterized in that: the inner wall both sides of casing (1) are provided with symmetrical transmitting terminal (5) and receiving terminal (6) respectively, the inner wall movable mounting of casing (1) has light screen (12), and the upper and lower both ends of light screen (12) all are equipped with the inclined plane, light screen (12) activity sets up between transmitting terminal (5), one side fixed mounting of light screen (12) has catch bar (13) that are arranged in casing (1), and the lateral wall fixed mounting of catch bar (13) has reset push rod (15), the top fixed mounting of reset push rod (15) has anti-contrary ball (150), and the inner wall movable mounting of casing (1) has imbibition piece (22) that are arranged in anti-contrary ball (150) top, anti-push chute way (102) have been seted up to the inboard of imbibition piece (22), and the bottom of imbibition piece (22) with prevent sliding connection between anti-contrary ball (150), when imbibition piece (22) received the downward activity of self moderate force, impel light screen (12) through reset push rod (15) and catch bar (13) and paste and be in the same place.

8. The novel ash removal and optical disturbance prevention device for the elevator flat-layer photoelectric sensor according to claim 7 is characterized in that: the top end of the push rod (13) is fixedly provided with an air pressing plate (14), the inner side of the shell (1) is provided with an air pressure cavity (100), the air pressing plate (14) is movably arranged in the air pressure cavity (100), the inner wall of the shell (1) is provided with an air conveying channel (101) communicated with the air pressure cavity (100), the inner side of the shell (1) is movably provided with a fan column (10) located below the receiving end (6), the outer side of the fan column (10) is fixedly provided with cleaning blades (11) for cleaning the surface of the receiving end (6), the number of the cleaning blades (11) is three, the three cleaning blades (11) are arranged at equal angles by taking the central axis of the fan column (10) as the center, one side of the fan column (10) is fixedly provided with fan blades (18), one end of the air conveying channel (101) is located on one side of the fan blades (18), and the fan blades (18) drive the fan column (10) to rotate through air flow output by the air conveying channel (101).

9. The novel ash removal and optical disturbance prevention device for the elevator flat-layer photoelectric sensor according to claim 8, is characterized in that: the inner cavity of the cleaning blade (11) is provided with a liquid storage cavity (20), a liquid squeezing plug (19) is movably mounted in the liquid storage cavity (20), the inner side of the cleaning blade (11) is provided with a liquid discharge channel (21) communicated with the liquid storage cavity (20), the inner wall of the shell (1) is provided with a liquid transfusion channel (103) communicated with the liquid discharge channel (21), a sufficient amount of medium is filled in the liquid storage cavity (20), and one end of the liquid transfusion channel (103) is positioned below the liquid suction block (22).

10. The novel ash removal and optical disturbance prevention device for the elevator flat-layer photoelectric sensor according to claim 9, is characterized in that: the inner wall fixed mounting of imbibition piece (22) has fender frame (17) that is arranged in reverse thrust chute way (102), and keeps off frame (17) slope and arranges in reverse thrust chute way (102), keeps off the direction of the highest tip slope reverse thrust chute way (102) of frame (17), the inner wall movable mounting of imbibition piece (22) has simple pendulum piece (16) that is arranged in reverse thrust chute way (102) and fender frame (17) tip juncture, the cross sectional shape of simple pendulum piece (16) is the calabash shape, flabellum (18) slope is arranged at fan post (10), the quantity of flabellum (18) has eight at least, and the lateral wall and the gas transmission way (101) tip sliding connection of flabellum (18), is provided with the area of keeping away on fan post (10), and clean leaf (11) can make the area of keeping away rotate to gas transmission way (101) department along with fan post (10) after the medium increases in the liquid storage chamber (20).

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