CN104444677A - Safety control device avoiding child taking elevator alone - Google Patents
Safety control device avoiding child taking elevator alone Download PDFInfo
- Publication number
- CN104444677A CN104444677A CN201410775436.8A CN201410775436A CN104444677A CN 104444677 A CN104444677 A CN 104444677A CN 201410775436 A CN201410775436 A CN 201410775436A CN 104444677 A CN104444677 A CN 104444677A
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- China
- Prior art keywords
- elevator
- children
- safety control
- door
- child
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
- B66B1/14—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. push-buttons, for indirect control of movements
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Types And Forms Of Lifts (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
Abstract
The invention discloses a safety control device avoiding a child taking an elevator along. The safety control device comprises a double infrared testing device and a voice alarm device. The elevator runs in the manner that in case the child near the elevator and presses a button, the infrared testing is started, and the elevator stops running if the testing result shows that height of the child is lower than 1.5 m; in case the child enters the elevator, the infrared testing is started again, if the testing result shows that the child with the height lower than 1.5 m enters the elevator along, the elevator door opens, and the voice alarm works to remind parents or other accompanied adults to take the elevator together with the child or stop the child to take, thus unnecessary injury caused by the fact that the child takes the elevator alone is avoided.
Description
Technical field
The present invention relates to a kind of safety control, be specifically related to the safety control that a kind of children of avoiding take separately elevator.
Background technology
In recent years, along with the fast development in city, continuing to bring out of high stored building group, cage lifter finds broad application in urban skyscraper, and has become live and work the people of high level are requisite and take instrument.But some safety problems of cage lifter ubiquity at present, such as, 1, because the car of cage lifter is an airtight narrow space comparatively speaking, children entering separately elevator when accompanying without adult, laughing and frolick, jumping, cause elevator stop jumping or all standing, if have an accident, children are in height panic situation, cannot save oneself; 2, induce problem due to elevator in recent years, frequently occurred by folder event, particularly for the people such as children and costive the old,weak,sick and disabled, the probability had an accident is larger; 3, due to children not etc. adult enter elevator and take alone elevator, the children loss event caused also happens occasionally.For above-mentioned listed series of problems, also inevitable in the cage lifter of current skyscraper, the safety problem of children can not get ensureing.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of safety control that children can be avoided to take separately elevator, this device is provided with Dual infrared detector and phonetic alarm device, the running state of elevator is as follows: 1, children near elevator and when pressing the button, carry out infrared detection, when the children only having < 1.5m being detected, elevator does not run; If 2 elevator doors are opened, when children enter elevator, again carry out infrared detection, if be detected as < 1.5m children for enter elevator alone, then elevator door does not close, and audio alert, remind Parents or the neighbouring adult that other are accompanied, accompanying children's ride-on elevator or prevent children and take elevator separately, avoiding the unnecessary injury that it causes because taking elevator separately.
The present invention is realized by following technical scheme:
A kind of children of avoiding take separately the safety control of elevator, comprise stop control setup, door system, car detecting device, apparatus for controlling elevator, control panel, phonetic alarm, it is characterized in that, described a kind of children of avoiding take separately the safety control of elevator with Dual infrared detector.
Described a kind of children of avoiding take separately the safety control of elevator with phonetic alarm device.
Described a kind of children of avoiding take separately the safety control of elevator with audio frequency intercom system.
Further, described stop control setup comprises and controls button, calling machine room center button, read out instrument, an infrared detecting device and audio frequency intercom system downstairs.
Further, described stop control setup be audio frequency intercom system bottom, downstairs button is overhead 1.2m place, button is overhead 1.25m place upstairs, calling machine room center button is overhead 1.4m place, read out instrument is arranged on liftoff 1.45m place, and infrared detecting device is arranged on the top of whole stop control setup, and overhead distance is 1.5m.
Described cab detecting device comprises three infrared detecting devices, one of them infrared detecting device is arranged on the top of door system, another infrared detecting device is arranged on two 1.5m places, lateral extent car ground of door system, also has the two 0.7m places, lateral extent car ground being arranged on door system.
Further, described door system comprises car door and layer door.
Further, described cab detecting device comprises two infrared detecting devices, one of them infrared detecting device is arranged on the top of door system, another infrared detecting device is arranged on two 1.5m places, lateral extent car ground of door system, also have the two 0.7m places, lateral extent car ground being arranged on door system, concrete car detecting device is arranged on the car door of door system.
Described apparatus for controlling elevator comprises tele-control system, audio frequency intercom system, video monitoring system, door opening and closing system, weight balancing system, emergency light, illumination, exhaust etc.
Described control panel comprises control circuit device, read out instrument, the calling machine room center fixture of door opening/closing apparatus, elevator each floor up and down, and further, described phonetic alarm is embedded in control panel.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is provided with dual infrared line and detects and phonetic alarm device, can effective and safe avoid children to take separately elevator and by folder event, and can be cost-saving.When children are near elevator and when pressing the button, the infra-red ray detection device of stop control setup starts to detect:
1, when infrared detecting device detects the human body only having < 1.5m, now elevator button automatic distinguishing, and not running, effectively can avoid children to enter elevator and laugh and frolick and play and the accident caused;
If when 2 human bodies are the adult of < 1.5m, then can click-to-dial machine room center button, intercommunication interconnected with machine room staff, allows staff's Long-distance Control remove this order, thus allows the adult of < 1.5m take elevator smoothly;
If 3 infra-red ray detection devices detect that the human body of > 1.5m is near elevator, then elevator runs to this floor and opens elevator door, and start car detecting device: when only having the human body of < 1.5m to enter elevator if detect, then start phonetic alarm device, and play the voice signal of prior typing, as, every head of a family please see the child running you well, not allow child take elevator separately! The children run well are at one's side seen in time in order to warn the head of a family or to be grown up.Now elevator halt runs, and elevator door does not cut out.
Accompanying drawing explanation
Fig. 1 is the stop control setup structural representation in the present invention;
Fig. 2 is the door system structural representation in the present invention;
Fig. 3 is the elevator integral structure schematic diagram in the present invention;
Fig. 4 is the elevator control panel schematic diagram in the present invention;
In figure, 1, stop control setup; 2, audio frequency intercom system; 3, upper and lower building controls button; 4, machine room center button is called out; 5, read out instrument; 6, infrared detecting device; 7, door system; 8, car door; 9, layer door; 10, control panel; 11, door opening/closing apparatus; 12, each floor control button; 13, phonetic alarm device; 14, read out instrument.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in the figure, the present invention has dual infrared line and detects 6 and phonetic alarm device 13, can effective and safe avoid children to take separately elevator and by folder event:
Embodiment 1
When only having < 1.5m children and accompany without adult:
Children are near elevator and when pressing upper and lower building control button 3, the infra-red ray detection device 6 of stop control setup 1 starts to detect, now infrared detecting device 6 detects to only have < 1.5m children, then elevator upper and lower building control button 3 automatic distinguishing, and does not run.
The advantage of this embodiment is: solve children and enter elevator separately, and takes alone elevator or inside laugh and frolick and play and the injury that causes, and the wasting of resources can effectively avoiding children disorderly to cause by elevator, can be effectively cost-saving.
Embodiment 2
When only having < 1.5m to be grown up:
When < 1.5m is grown up near elevator when pressing upper and lower building control button 3, the infra-red ray detection device 6 of stop control setup 1 still starts to detect, the Human Height that now infrared detecting device 6 detects remains unchanged < 1.5m, but this adult can click-to-dial machine room center button 4, interconnected by audio frequency intercom system 2 with machine room staff, and allow staff's Long-distance Control remove this order, thus the adult of < 1.5m is allowed to take elevator smoothly.
The advantage of this embodiment is: the adult solving height < 1.5m takes the puzzlement of elevator, children can be avoided again to enter elevator separately simultaneously, and take alone elevator or inside laugh and frolick and play and the injury caused, and the wasting of resources can effectively avoiding children disorderly to cause by elevator, can be effectively cost-saving.
Embodiment 3
The adult of existing > 1.5m, has again the situation of < 1.5m children:
Close elevator when children and adult while is also pressed, downstairs during control button 3, the infra-red ray detection device 6 of stop control setup 1 starts to detect, now infra-red ray detection device 6 detects that the adult of > 1.5m is near elevator, elevator runs to this floor and opens elevator door, and start the infra-red ray detection device 6 of car detecting device: when only having the human body of < 1.5m to enter elevator if detect, then start phonetic alarm device 13, and play the voice signal of prior typing, as, every head of a family please see the child running you well, child is not allowed to take elevator separately! the children run well are at one's side seen in time in order to warn the head of a family or to be grown up.Now elevator halt runs, and elevator door does not cut out, and starts phonetic alarm device simultaneously, sends signal to machine room center, allow handler solve as early as possible state that children enter separately elevator, thus avoids children to come to harm.
The advantage of this embodiment is: solve children and enter elevator separately, and takes alone elevator or inside laugh and frolick and play and the injury caused; And on door system, fill the different infrared detecting device 6 of two groups of height, can effectively avoid object or children old man by the event of pressing from both sides.
Embodiment 4
The adult of existing > 1.5m, has again the situation of < 1.5m children:
When children and adult are simultaneously near elevator and when pressing upper and lower building control button 3, the infra-red ray detection device 6 of stop control setup 1 starts to detect, now infra-red ray detection device 6 detects that the adult of > 1.5m is near elevator, elevator runs to this floor and opens elevator door, and start the infra-red ray detection device 6 of car detecting device: if when detecting that children and adult enter elevator, elevator normally runs simultaneously.
The advantage of this embodiment is: the normal operation maintaining elevator, and solves children and enter elevator separately, and takes alone elevator or inside laugh and frolick and play and the injury caused.
Claims (8)
1. the safety control avoiding children to take separately elevator, comprise stop control setup, door system, car detecting device, apparatus for controlling elevator, control panel, phonetic alarm, it is characterized in that, described a kind of children of avoiding take separately the device of elevator with Dual infrared detector.
2. a kind of children of avoiding according to claim 1 take separately the safety control of elevator, it is characterized in that, described stop control setup comprises and controls button, calling machine room center button, read out instrument, an infrared detecting device and audio frequency intercom system downstairs.
3. a kind of children of avoiding according to claim 1-2 take separately the safety control of elevator, it is characterized in that, described infrared detecting device is arranged on the top of stop control setup, and overhead distance is 1.5m.
4. a kind of children of avoiding according to claim 1 take separately the safety control of elevator, it is characterized in that, described infra-red ray detection device is arranged on door system.
5. a kind of children of avoiding according to claim 1-4 take separately the safety control of elevator, it is characterized in that, described infra-red ray detection device arranges the both sides of the top of door system and the door system at distance 1.5m, 0.7m place, car ground respectively.
6. a kind of children of avoiding according to claim 1-6 take separately the safety control of elevator, it is characterized in that, described door system comprises car door and layer door.
7. a kind of children of avoiding according to claim 1 take separately the safety control of elevator, it is characterized in that, described apparatus for controlling elevator comprises tele-control system, audio frequency intercom system, video monitoring system, door opening and closing system, weight balancing system, emergency light, illumination, exhaust.
8. a kind of children of avoiding according to claim 1 take separately the safety control of elevator, it is characterized in that, described control panel comprises control circuit device, read out instrument, calling machine room center fixture, the phonetic alarm of door opening/closing apparatus, elevator each floor up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410775436.8A CN104444677A (en) | 2014-12-15 | 2014-12-15 | Safety control device avoiding child taking elevator alone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410775436.8A CN104444677A (en) | 2014-12-15 | 2014-12-15 | Safety control device avoiding child taking elevator alone |
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| CN104444677A true CN104444677A (en) | 2015-03-25 |
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| CN201410775436.8A Pending CN104444677A (en) | 2014-12-15 | 2014-12-15 | Safety control device avoiding child taking elevator alone |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060049A (en) * | 2015-07-14 | 2015-11-18 | 日立电梯（中国）有限公司 | Protection device and method for children taking elevator |
| CN105060050A (en) * | 2015-07-23 | 2015-11-18 | 孟凯涛 | Elevator running door opening dangerous case detection system |
| CN105129550A (en) * | 2015-08-03 | 2015-12-09 | 陈思 | Elevator safety control platform for preventing juveniles from taking elevator alone |
| CN105129551A (en) * | 2015-08-03 | 2015-12-09 | 陈思 | Safety control method for preventing juveniles from taking elevator alone |
| CN106006272A (en) * | 2016-07-25 | 2016-10-12 | 南京科技职业学院 | Intelligent monitoring system for internet of things of elevator |
| CN106629292A (en) * | 2016-11-30 | 2017-05-10 | 广州日滨科技发展有限公司 | Alarming method and device for elevator and elevator |
| CN106815908A (en) * | 2016-12-09 | 2017-06-09 | 国网北京市电力公司 | Alarm processing method, device and Gate-ban Monitoring System |
| CN107601236A (en) * | 2017-11-06 | 2018-01-19 | 孙复庆 | Lift car vehicle prevents system |
| CN107673152A (en) * | 2017-09-11 | 2018-02-09 | 浙江新再灵科技股份有限公司 | The alarm method that children individually take in cage type elevator |
| CN108083040A (en) * | 2017-12-28 | 2018-05-29 | 重庆迈高电梯有限公司 | A kind of coordinated type elevator outer calling control system and electric life controller |
| WO2018209530A1 (en) * | 2017-05-15 | 2018-11-22 | 深圳市永恒丰科技有限公司 | Elevator control method and device |
| WO2018209526A1 (en) * | 2017-05-15 | 2018-11-22 | 深圳市永恒丰科技有限公司 | Elevator control method and system, and elevator side terminal |
| WO2018218550A1 (en) * | 2017-05-31 | 2018-12-06 | 深圳市永恒丰科技有限公司 | Method for controlling elevator by means of elevator-side terminal |
| CN109987469A (en) * | 2019-04-13 | 2019-07-09 | 广东联合富士电梯有限公司 | Elevator passenger imaging system intelligent control scheme |
| CN110540116A (en) * | 2018-05-29 | 2019-12-06 | 张量 | Elevator monitoring method, device and system |
| CN110685119A (en) * | 2019-11-20 | 2020-01-14 | 四川虹美智能科技有限公司 | Washing machine and system and method for guaranteeing safety of children |
| CN111362077A (en) * | 2020-04-26 | 2020-07-03 | 苏州市职业大学 | Elevator monitoring system for preventing children from taking elevator alone |
| CN112811281A (en) * | 2020-12-30 | 2021-05-18 | 浙江欧姆龙电梯有限公司 | Vertical lifting device based on signal identification triggers |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03293271A (en) * | 1990-04-09 | 1991-12-24 | Hitachi Building Syst Eng & Service Co Ltd | elevator operating equipment |
| JP2007031105A (en) * | 2005-07-28 | 2007-02-08 | Hitachi Building Systems Co Ltd | Elevator passenger abnormality detection device |
| CN202170211U (en) * | 2011-08-05 | 2012-03-21 | 张瀚予 | Control device for preventing child from taking elevator alone |
| CN202481871U (en) * | 2012-03-30 | 2012-10-10 | 哈尔滨凯纳科技股份有限公司 | Elevator monitoring device |
| CN103072856A (en) * | 2013-01-31 | 2013-05-01 | 哈尔滨工业大学 | Elevator-waiting people recognizing device based on infrared sensor and elevator scheduling method based on people recognition |
| CN202912522U (en) * | 2012-11-16 | 2013-05-01 | 倪珏皓 | Safety protection device capable of preventing children from taking elevator alone |
| CN203079495U (en) * | 2012-12-11 | 2013-07-24 | 东营市宏安电梯有限责任公司 | Elevator intelligent light curtain |
-
2014
- 2014-12-15 CN CN201410775436.8A patent/CN104444677A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03293271A (en) * | 1990-04-09 | 1991-12-24 | Hitachi Building Syst Eng & Service Co Ltd | elevator operating equipment |
| JP2007031105A (en) * | 2005-07-28 | 2007-02-08 | Hitachi Building Systems Co Ltd | Elevator passenger abnormality detection device |
| CN202170211U (en) * | 2011-08-05 | 2012-03-21 | 张瀚予 | Control device for preventing child from taking elevator alone |
| CN202481871U (en) * | 2012-03-30 | 2012-10-10 | 哈尔滨凯纳科技股份有限公司 | Elevator monitoring device |
| CN202912522U (en) * | 2012-11-16 | 2013-05-01 | 倪珏皓 | Safety protection device capable of preventing children from taking elevator alone |
| CN203079495U (en) * | 2012-12-11 | 2013-07-24 | 东营市宏安电梯有限责任公司 | Elevator intelligent light curtain |
| CN103072856A (en) * | 2013-01-31 | 2013-05-01 | 哈尔滨工业大学 | Elevator-waiting people recognizing device based on infrared sensor and elevator scheduling method based on people recognition |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060049A (en) * | 2015-07-14 | 2015-11-18 | 日立电梯（中国）有限公司 | Protection device and method for children taking elevator |
| CN105060050A (en) * | 2015-07-23 | 2015-11-18 | 孟凯涛 | Elevator running door opening dangerous case detection system |
| CN105129550A (en) * | 2015-08-03 | 2015-12-09 | 陈思 | Elevator safety control platform for preventing juveniles from taking elevator alone |
| CN105129551A (en) * | 2015-08-03 | 2015-12-09 | 陈思 | Safety control method for preventing juveniles from taking elevator alone |
| CN105129550B (en) * | 2015-08-03 | 2016-09-14 | 罗普特（厦门）科技集团有限公司 | The elevator safety preventing minor from individually taking controls platform |
| CN106006272A (en) * | 2016-07-25 | 2016-10-12 | 南京科技职业学院 | Intelligent monitoring system for internet of things of elevator |
| CN106629292A (en) * | 2016-11-30 | 2017-05-10 | 广州日滨科技发展有限公司 | Alarming method and device for elevator and elevator |
| CN106629292B (en) * | 2016-11-30 | 2019-06-21 | 日立楼宇技术（广州）有限公司 | Elevator alarm method, device and elevator |
| CN106815908A (en) * | 2016-12-09 | 2017-06-09 | 国网北京市电力公司 | Alarm processing method, device and Gate-ban Monitoring System |
| CN106815908B (en) * | 2016-12-09 | 2019-11-22 | 国网北京市电力公司 | Alarm processing method, device and access control monitoring system |
| WO2018209526A1 (en) * | 2017-05-15 | 2018-11-22 | 深圳市永恒丰科技有限公司 | Elevator control method and system, and elevator side terminal |
| WO2018209530A1 (en) * | 2017-05-15 | 2018-11-22 | 深圳市永恒丰科技有限公司 | Elevator control method and device |
| WO2018218550A1 (en) * | 2017-05-31 | 2018-12-06 | 深圳市永恒丰科技有限公司 | Method for controlling elevator by means of elevator-side terminal |
| CN107673152A (en) * | 2017-09-11 | 2018-02-09 | 浙江新再灵科技股份有限公司 | The alarm method that children individually take in cage type elevator |
| CN107601236A (en) * | 2017-11-06 | 2018-01-19 | 孙复庆 | Lift car vehicle prevents system |
| CN107601236B (en) * | 2017-11-06 | 2023-07-07 | 杨金星 | Elevator car vehicle stopping system |
| CN108083040A (en) * | 2017-12-28 | 2018-05-29 | 重庆迈高电梯有限公司 | A kind of coordinated type elevator outer calling control system and electric life controller |
| CN110540116A (en) * | 2018-05-29 | 2019-12-06 | 张量 | Elevator monitoring method, device and system |
| CN109987469A (en) * | 2019-04-13 | 2019-07-09 | 广东联合富士电梯有限公司 | Elevator passenger imaging system intelligent control scheme |
| CN110685119A (en) * | 2019-11-20 | 2020-01-14 | 四川虹美智能科技有限公司 | Washing machine and system and method for guaranteeing safety of children |
| CN111362077A (en) * | 2020-04-26 | 2020-07-03 | 苏州市职业大学 | Elevator monitoring system for preventing children from taking elevator alone |
| CN112811281A (en) * | 2020-12-30 | 2021-05-18 | 浙江欧姆龙电梯有限公司 | Vertical lifting device based on signal identification triggers |
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Application publication date: 20150325 |
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