CN111908290A - Elevator car stopping device and method - Google Patents
Elevator car stopping device and method Download PDFInfo
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- CN111908290A CN111908290A CN202010797579.4A CN202010797579A CN111908290A CN 111908290 A CN111908290 A CN 111908290A CN 202010797579 A CN202010797579 A CN 202010797579A CN 111908290 A CN111908290 A CN 111908290A
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- elevator
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- alarm
- elevator car
- radar detector
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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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/021—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system
- B66B5/025—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system where the abnormal operating condition is caused by human behaviour or misbehaviour, e.g. forcing the doors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/02—Cages, i.e. cars
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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
- B66B5/0012—Devices monitoring the users of the elevator system
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
Abstract
The invention relates to the technical field of elevator car stopping, in particular to an elevator car stopping device, which comprises: a housing; the detection assembly comprises a radar detector and an ultrasonic detector, and the radar detector and the ultrasonic detector are arranged in the shell at intervals; the controller is arranged in the shell and is electrically connected with the radar detector and the ultrasonic detector respectively; a floor detection assembly for confirmation of a predetermined detection floor; the alarm assembly is arranged in the shell and is connected with the controller; when the radar detector detects that the object entering the elevator cage is a metal object, the length of the object entering the elevator cage is within a set length range, and the ultrasonic detector also detects the object, the controller controls the alarm component to give an alarm. The invention improves the detection reliability by the radar detector and the ultrasonic detector which are arranged on the inner side wall of the elevator cage at intervals along the entering and exiting direction of the electric vehicle and the characteristic induction type detection of the length of the car body and the amount of metal when the electric vehicle enters the elevator cage.
Description
Technical Field
The invention relates to the technical field of elevator car stopping, in particular to an elevator car stopping device and method.
Background
The electric vehicle becomes a main tool favored by urban traffic of the masses, is convenient and light, and has more than 3 hundred million of electric vehicles in China in 2019 according to official statistics; according to the statistics of fire rescue bureau of emergency administration, electric vehicle fires of 1 ten thousand occur in the country between 2013 and 2017 in 5 years, the number of the fires is about 2000 in each year, and the fires are increased by 33.3% in five years. In 2014, guidance opinions about promoting the health development of smart cities and clear text regulations of fire control laws issued by the department of fire protection, and electric vehicles and other sundries forbidden to be parked in fire-fighting passageways were issued by the departments of development and improvement committee, the department of living and construction, the department of transportation and the like in China in a united manner. For this reason, more and more property management began to state that electric vehicles are prohibited from entering the elevator.
In the prior art, in order to forbid an elevator from entering the elevator, a human supervision or an image recognition technology is mostly adopted. The special person handles the elevator to forbid the electric vehicle from entering the home under manual supervision; the intelligent image recognition technology is that a miniature camera is arranged in an elevator, algorithm calculation is carried out according to the characteristics of the battery car, such as a handle, a seat and the like, so that whether the battery car is an electric car is recognized and judged, and when the battery car is judged to be in the electric car, the elevator is prevented from being closed;
however, the manual identification method is time-consuming and labor-consuming, which causes waste of human resources; the image recognition technology needs wiring and networking storage on one hand, and also has the problem of being easy to avoid on the other hand, for example, a camera is shielded or a vehicle is shielded by using a rain cape, an umbrella and the like, so that the success rate of image recognition is greatly reduced, and the purpose of vehicle blocking cannot be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an elevator car stopping device and method are provided to improve the success rate of elevator car stopping recognition.
In order to achieve the above object, one aspect of the present invention provides an elevator car stopping device, comprising:
the elevator comprises a shell, a door body and a door body, wherein the shell is arranged in a cuboid shape and horizontally fixed on one side wall of two sides of the elevator in the entering and exiting direction;
the detection assembly comprises a radar detector and an ultrasonic detector, the radar detector and the ultrasonic detector are arranged in the shell at intervals, the radar detector is arranged in the shell and close to one end of the elevator inlet/outlet, and the ultrasonic detector is arranged in the shell and far away from one end of the elevator inlet/outlet;
the controller is arranged in the shell and is electrically connected with the radar detector and the ultrasonic detector respectively;
the floor detection assembly is fixed outside the elevator cage, is connected with the controller and is used for confirming the preset detection floor;
the alarm assembly is arranged in the shell and is connected with the controller;
the radar detector is used for detecting metal and the length of an object entering a carriage and detecting the metal, and the ultrasonic detector is used for sensing the object; when the floor detection group detects that the elevator is at a set floor, the radar detector and the ultrasonic detector start to work;
when the radar detector detects that the object entering the elevator cage is a metal object, the length of the object entering the elevator cage is within a set length range, and the ultrasonic detector also detects the object, the controller controls the alarm component to give an alarm.
Further, the floor detection assembly comprises a photoelectric sensor and a reflector;
the photoelectric sensor is connected with the controller and emits a light beam towards the outer side of the elevator cage;
the reflecting plate is fixed at a preset position outside the elevator cage at a set floor, and when the elevator cage stops at the set floor, the reflecting plate reflects the light beam emitted by the photoelectric sensor to the photoelectric sensor;
when the photoelectric sensor receives the light beam reflected by the reflector, the photoelectric sensor outputs a switch control signal to the controller.
Further, the controller is electrically connected with a control switch of the elevator cage, and when the alarm component gives an alarm, the controller controls the control switch of the elevator cage to keep the cage door normally open, so that the elevator stays at a set floor until the alarm is relieved.
Further, the distance between the radar detector and the ultrasonic detector ranges from 50cm to 100 cm.
Further, the triggering condition of the alarm device further includes: and when the ultrasonic detector detects an object within a preset time, the radar detector still detects the metal characteristic.
Further, the installation height range of the shell on the side wall of the elevator cage is 28 cm-35 cm above the upper surface of the cage bottom.
Further, the alarm component is a light alarm, a buzzer or a voice alarm.
On the other hand, the invention also provides an elevator car stopping method applying the elevator car stopping device, which comprises the following steps:
confirming that the elevator cage is at a floor to be detected;
confirming that the radar detector detects a metal signal and the length of the detected object meets a set threshold;
judging whether an ultrasonic detector detects a metal signal within a preset time, and judging whether the radar detector and the ultrasonic detector simultaneously detect metal;
if the ultrasonic detector and the radar detector detect signals within preset time, the alarm assembly gives an alarm, and meanwhile the controller controls the elevator cage to be immobile and keeps the elevator cage door normally open until the ultrasonic detector cannot detect metal signals and the radar detector cannot detect metal and then contacts with the elevator cage to control the elevator cage.
The invention has the beneficial effects that: according to the invention, the radar detectors and the ultrasonic detectors are arranged on the inner side wall of the elevator cage at intervals along the entering and exiting directions of the electric vehicle, and the characteristic induction type detection of the length of the car body and the amount of metal when the electric vehicle enters the elevator cage is adopted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an elevator car stopping device in the embodiment of the invention;
fig. 2 is a schematic perspective view of the car stopping device of the elevator in the embodiment of the invention (with the front cover of the shell removed);
fig. 3 is a plan view of an elevator car stopping device installed in an elevator cage according to an embodiment of the present invention;
fig. 4 is a front view of an elevator car stopping device installed in an elevator cage in an embodiment of the present invention;
fig. 5 is a left side view of an elevator car stopping device installed in an elevator cage in an embodiment of the present invention;
fig. 6 is a partial enlarged view of a portion a in fig. 3 according to an embodiment of the present invention.
Fig. 7 is a flow chart of an elevator car stopping method in the embodiment of the invention.
Reference numerals: 10. a housing; 20. a detection component; 21. a radar detector; 22. an ultrasonic detector; 30. a controller; 40. a floor detection assembly; 41. a photosensor; 42. a reflector; 50. and an alarm component.
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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The car stopping device of the elevator as shown in fig. 1 to 6 comprises a housing 10, a detection assembly 20, a controller 30, a floor detection assembly 40 and an alarm assembly 50, wherein:
the casing 10 is arranged in a cuboid shape, and the casing 10 is horizontally fixed on one side wall of two sides in the elevator in-out direction; the housing 10 is used for fixing components in the car stopping device of the elevator and fixing the housing 10 on the side wall of the elevator car, as shown in fig. 3 and 4, the longitudinal direction of the housing 10 is horizontally fixed on the car wall, the front cover of the housing 10 is arranged parallel to the side wall of the elevator car, the back plate of the housing 10 is fixed on the car wall by rivets, and before fixing, an opening is needed on the car wall for connecting the floor detection assembly 40.
The detection assembly 20 comprises a radar detector 21 and an ultrasonic detector 22, the radar detector 21 and the ultrasonic detector 22 are arranged inside the shell 10 at intervals, the radar detector 21 is arranged in the shell 10 at one end close to the elevator access, and the ultrasonic detector 22 is arranged in the shell 10 at one end far away from the elevator access; the radar detector 21 is used for detecting metal and the length of an object entering a carriage and detecting the metal, and the ultrasonic detector 22 is used for sensing whether the object exists in an area or not; when the floor detection group detects that the elevator is at a set floor, the radar detector 21 and the ultrasonic detector 22 start to work; as shown in fig. 3, the radar detector 21 emits a sector to scan in a direction opposite to the radar detector, so that the sector area covers the length direction of the elevator car, the radar is reflected when encountering an object after scanning, and the object length and metal detection are performed by receiving signals of the reflected waves. The working principle is that microwaves with shorter emission wavelengths can penetrate through non-metal materials such as umbrellas, cotton and hemp, paper and the like due to stronger penetrating power of the microwaves, but stronger reflection can be caused to metal objects, and whether the metal objects are metal or not is judged according to the energy value received by a radar; and for the judgment of the length of the object, the emitted microwave is a beam of dispersed points, a coordinate axis in the length direction can be formed along the direction of the electric vehicle entering and exiting the elevator, the starting point of the object entering the elevator cage can be judged through the change of the received energy value, and the length of the vehicle body can be obtained through calculation and conversion. The principle of ultrasonic detection is similar to that of the radar, and the function of the ultrasonic detection is to assist detection to confirm whether a vehicle enters or not, so that the detection accuracy is further improved.
A controller 30 disposed in the housing 10 and electrically connected to the radar detector 21 and the ultrasonic detector 22, respectively; the controller 30 is used for calculating and converting the reflected wave signal to determine the detection information, and for cooperating with the floor detection and alarm module 50 to finally achieve the purpose of alarming. It should also be noted that the controller 30 can also be connected to the control end of the elevator to control the elevator to stop.
A floor sensing assembly 40 fixed to an outside of the cage and connected to the controller 30 for confirmation of a predetermined sensing floor; in the embodiment of the invention, the scheme is adopted to prevent the electric vehicle from going upwards through the elevator only on the first floor of the elevator resident, and the electric vehicle can smoothly go downwards from the high floor to play a role in dredging.
An alarm assembly 50 disposed in the housing 10 and connected to the controller 30; it should be noted that the alarm component 50 may be a light alarm, a buzzer alarm, or a voice alarm for more specific prompt.
In the embodiment of the invention, the voice alarm is adopted for alarming and safety declaration so as to improve the adaptability of residents.
For example, the method can be used for preventing an electric vehicle from entering a house through an elevator according to the regulation of a community so as to avoid safety accidents and calling for charging at a specified place of an underground garage "
The specific determination conditions in the embodiment of the present invention are: when the radar detector 21 detects that the object entering the elevator cage is a metal object and the length of the object entering the elevator cage is within a set length range, and the ultrasonic detector 22 also detects that there is an object in the area, the controller 30 controls the alarm component 50 to give an alarm. The length of the electric vehicle is generally set to 120cm to 230 cm. When the length is within this range, it is judged that the first condition is satisfied, when the radar detector 21 detects that it is a metal component, it is judged that the second condition is satisfied, when the ultrasonic detector 22 detects that it is confirmed that there is an object near the innermost end of the cage inside the elevator, it is judged that the last condition is satisfied, and when all of the three conditions are satisfied, it is judged that the object entering the cage is an electric car.
In the above embodiment, through radar detector 21 and ultrasonic detector 22 that set up at the interval on the electric motor car business turn over direction on the elevator railway carriage or compartment inside wall, the characteristic induction type of automobile body length and metal volume detects when getting into in the elevator railway carriage or compartment through the electric motor car, compares with prior art, has improved the reliability that detects greatly, has overcome the easy defect of sheltering from and dodging in the image recognition technology, has also reduced the manpower and materials expenditure of property simultaneously.
Further, the floor detection assembly 40 includes a photoelectric sensor 41 and a reflector 42;
the photoelectric sensor 41 is connected to the controller 30 and emits a light beam toward the outside of the cage; the connection is made in such a manner that the wiring of the photoelectric sensor 41 is connected to the controller 30 in the casing 10 through a hole formed in the side wall of the cage, and the hole is covered by the back of the casing 10.
The reflecting plate 42 is fixed at a predetermined position outside the cage at the set floor, and when the cage stops at the set floor, the reflecting plate 42 reflects the light beam emitted from the photoelectric sensor 41 to the photoelectric sensor 41; it should be noted here that the photoelectric sensor 41 may be fixed on the top or bottom of the elevator car, or may be at an intermediate position, the reflection plate 42 is at the same level as the photoelectric sensor 41, and is fixed in the building where the elevator car runs, in this embodiment, the reflection plate 42 is disposed at a floor, when the elevator runs to a floor, the light beam emitted by the photoelectric sensor 41 is reflected by the reflection plate 42 and then received by the photoelectric sensor 41, and at this time, the photoelectric sensor 41 outputs a signal to the controller 30, and starts the detection of the radar detector 21 and the ultrasonic detector 22.
In the embodiment of the present invention, the controller 30 is electrically connected to the control switch of the cage, and when the alarm module 50 gives an alarm, the controller 30 controls the control switch of the cage to keep the door normally open and close the floor button of the cage, so that the cage stays at the set floor until the alarm is released.
In the embodiment of the invention, in order to detect the electric vehicle more accurately, the distance between the radar detector 21 and the ultrasonic detector 22 ranges from 50cm to 100 cm. In the embodiment of the present invention, the distance between the two is set to be 100cm, as shown in fig. 3, since the radar emits a sector area, and the electric vehicle generally enters along a direction parallel to the fixed side wall of the housing 10, which results in that the center of the radar is closest to the detection position, which results in that the energy detected at the center of the radar is strongest and the detection result is most accurate, so the energy value near the center of the radar is generally used as the reference data for metal detection. In order to prevent false alarm, for example, when a wheelchair enters an elevator car, the distance between the ultrasonic detector 22 and the radar detector 21 is increased to prevent false detection, and it is confirmed that the length of an object entering the elevator car can satisfy a set threshold when the radar detector 21 detects metal, thereby improving the detection accuracy.
The triggering condition of the alarm device specifically further includes: when the ultrasonic detector 22 detects an object within a predetermined time, the radar detector 21 still detects the metal property. In the above embodiment, when the wheelchair enters the elevator cage, since the length of the metal frame of the wheelchair body is less than 100, only the radar detector 21 detects the metal or the ultrasonic detector 22 can detect the object according to the position of the wheelchair at the same time, and both do not satisfy the condition at the same time, the alarm is not triggered, and the detection success rate of the car stopping device is improved.
In order to further improve the detection accuracy, the installation height range of the shell 10 on the side wall of the elevator cage is 28 cm-35 cm above the upper surface of the cage bottom. The purpose of setting this height is to detect the wheel clearance and to avoid erroneous judgment of objects such as metal cabinets and decorative metal plates.
Specifically, the triggering condition of the alarm device further includes: when the radar detector 21 detects the metal characteristic, the detection signal of the radar detector 21 disappears for a certain period of time, and then the radar detector 21 continues to detect the metal signal. The disappearance of the signal means the disappearance of the energy signal of the detected metal at the center position of the radar, and the utilization is that the radar detector 21 first detects the metal characteristic of the wheel in front of the electric vehicle according to the gap between the two wheels or the neutral position between the footrests of the vehicle by simulating the situation that the vehicle enters the cage, as shown in fig. 5, the distance of the first wheel from the radar detector 21 becomes larger with the metal of the vehicle until the signal is not detected, then the first wheel enters the detection range of the ultrasonic detector 22, at this time, the second wheel also reaches the middle position of the radar detector 21, at this time, the radar detector 21 can still detect the metal, and the ultrasonic detector 22 can detect the object, thereby determining the electric vehicle. Through the structural characteristics of the electric vehicle, the accurate detection of the vehicle is realized by utilizing the gaps between the wheels, and the identification accuracy of the vehicle is improved. In addition, it should be noted here that the detection signal of the radar detector 21 is a periodic scan, and the radar detector 21 performs screening identification on all data of each period.
The embodiment of the invention also provides a car stopping method for the ladder, as shown in fig. 7, the car stopping device is applied, and the method comprises the following steps:
s10: confirming that the elevator cage is at a floor to be detected; the detection floor is generally set to one floor.
S20: confirming that the radar detector 21 detects a metal signal and the detected length of the object meets a set threshold; the set threshold refers to the length of the electric vehicle from 120cm to 230 cm.
S30: judging whether the ultrasonic detector 22 detects an object signal within a predetermined time, and judging whether the radar detector 21 and the ultrasonic detector 22 detect signals at the same time; the time set here is generally within 10 seconds.
S40: if the ultrasonic detector 22 and the radar detector 21 both detect signals within the preset time, the alarm component 50 gives an alarm, and meanwhile, the controller 30 controls the elevator car to be immobile, keeps the elevator car door normally open until the ultrasonic detector 22 cannot detect the object signals and the radar detector 21 cannot detect metal, and then releases the control of the elevator car door.
Further, a wheel clearance detection triggering condition is set on the basis of the judgment condition, namely, the detection precision of the vehicle entering the elevator cage is further improved by detecting whether the non-metal clearance occurs in the process of the object entering the elevator cage and still meeting the judgment condition after the object enters the elevator cage.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An elevator car stopping device, characterized by comprising:
the elevator comprises a shell, a door body and a door body, wherein the shell is arranged in a cuboid shape and horizontally fixed on one side wall of two sides of the elevator in the entering and exiting direction;
the detection assembly comprises a radar detector and an ultrasonic detector, the radar detector and the ultrasonic detector are arranged in the shell at intervals, the radar detector is arranged in the shell and close to one end of the elevator inlet/outlet, and the ultrasonic detector is arranged in the shell and far away from one end of the elevator inlet/outlet;
the controller is arranged in the shell and is electrically connected with the radar detector and the ultrasonic detector respectively;
the floor detection assembly is fixed outside the elevator cage, is connected with the controller and is used for confirming the preset detection floor;
the alarm assembly is arranged in the shell and is connected with the controller;
the radar detector is used for detecting metal and the length of an object entering a carriage and detecting the metal, and the ultrasonic detector is used for sensing the object; when the floor detection group detects that the elevator is at a set floor, the radar detector and the ultrasonic detector start to work;
when the radar detector detects that the object entering the elevator cage is a metal object, the length of the object entering the elevator cage is within a set length range, and the ultrasonic detector also detects the object, the controller controls the alarm component to give an alarm.
2. The elevator car stopping device according to claim 1, wherein the floor detection assembly comprises a photoelectric sensor and a reflector plate;
the photoelectric sensor is connected with the controller and emits a light beam towards the outer side of the elevator cage;
the reflecting plate is fixed at a preset position outside the elevator cage at a set floor, and when the elevator cage stops at the set floor, the reflecting plate reflects the light beam emitted by the photoelectric sensor to the photoelectric sensor;
when the photoelectric sensor receives the light beam reflected by the reflector, the photoelectric sensor outputs a switch control signal to the controller.
3. The elevator car stopping device according to claim 1 or 2, wherein the controller is electrically connected to a control switch of the elevator car, and when the alarm component gives an alarm, the controller controls the control switch of the elevator car to keep the car door normally open, so that the elevator stays at the set floor until the alarm is released.
4. The elevator car stopping device according to claim 1, wherein a distance between the radar detector and the ultrasonic detector is in a range of 50cm to 100 cm.
5. The elevator car stopping device according to claim 4, wherein the triggering condition of the warning device further comprises: and when the ultrasonic detector detects an object within a preset time, the radar detector still detects the metal characteristic.
6. The elevator car stopping device according to claim 1, wherein the mounting height of the housing on the side wall of the elevator car is in the range of 28cm to 35cm above the upper surface of the car bottom.
7. The elevator car stopping device according to claim 1, wherein the alarm component is a light alarm, a buzzer or a voice alarm.
8. An elevator car stopping method using the elevator car stopping device according to any one of claims 1 to 7, characterized by comprising the steps of:
confirming that the elevator cage is at a floor to be detected;
confirming that the radar detector detects a metal signal and the length of the detected object meets a set threshold;
judging whether an ultrasonic detector detects an object signal within a preset time, and judging whether the radar detector and the ultrasonic detector simultaneously meet the conditions;
if the ultrasonic detector and the radar detector detect signals within preset time, the alarm assembly gives an alarm, and meanwhile the controller controls the elevator car to be immobile and keeps the elevator car door normally open until the radar detector cannot detect metal, and the control on the elevator car door is removed.
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| CN202010797579.4A CN111908290B (en) | 2020-08-10 | 2020-08-10 | Elevator car stopping device and method |
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| CN202010797579.4A CN111908290B (en) | 2020-08-10 | 2020-08-10 | Elevator car stopping device and method |
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| CN113003341A (en) * | 2021-02-22 | 2021-06-22 | 上海三菱电梯有限公司 | Elevator reminding system |
| CN114394501A (en) * | 2022-01-20 | 2022-04-26 | 济南博观智能科技有限公司 | Method and device for supervising forbidden entry of electric vehicle into elevator and elevator |
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| CN111908290B (en) | 2021-06-15 |
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Denomination of invention: Elevator car blocking device and method Effective date of registration: 20220506 Granted publication date: 20210615 Pledgee: China Construction Bank Corporation Changzhou Economic Development Zone sub branch Pledgor: Zhipuno (Changzhou) Electronic Technology Co.,Ltd. Registration number: Y2022980005178 |
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Denomination of invention: An elevator blocking device and method Effective date of registration: 20230529 Granted publication date: 20210615 Pledgee: China Construction Bank Corporation Changzhou Economic Development Zone sub branch Pledgor: Zhipuno (Changzhou) Electronic Technology Co.,Ltd. Registration number: Y2023980042150 |