CN108217502B - Elevator speed-limiting safety control system - Google Patents
Elevator speed-limiting safety control system Download PDFInfo
- Publication number
- CN108217502B CN108217502B CN201810136318.0A CN201810136318A CN108217502B CN 108217502 B CN108217502 B CN 108217502B CN 201810136318 A CN201810136318 A CN 201810136318A CN 108217502 B CN108217502 B CN 108217502B
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- China
- Prior art keywords
- switch
- tension roller
- elevator
- speed
- control system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000008054 signal transmission Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 19
- 230000001960 triggered effect Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/16—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes for action on ropes or cables
-
- 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
- B66B5/027—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door
Abstract
The invention discloses an elevator speed-limiting safety control system which comprises a speed-limiting steel wire rope, a tension roller, a heavy hammer and a tension roller switch, wherein the speed-limiting steel wire rope is arranged on an elevator frame and connected with a speed limiter, the tension roller is ridden at the bottom end of the speed-limiting steel wire rope, the heavy hammer is connected with a wheel shaft of the tension roller to tighten the speed-limiting steel wire rope, the tension roller switch is arranged on the wheel shaft of the tension roller, the tension roller switch is connected with an elevator host controller in series, the elevator speed-limiting safety control system also comprises a change-over switch and a tension roller standby switch which is arranged in parallel with the tension roller switch, the triggering distance of the tension roller standby switch is larger than that of the tension roller switch, and the tension roller standby switch is connected with the tension roller switch in parallel after being connected with the change-over switch in series. When the elevator breaks down and stops running to cause people to be trapped due to the fact that the tension roller switch firstly touches the trigger frame, the switching switch is closed, a loop where the tension roller standby switch is located is conducted, the loop where the tension roller switch is located is replaced, and the elevator is kept to run to a flat floor position to rescue people trapped in the elevator.
Description
Technical Field
The invention relates to an elevator safety technology, in particular to an elevator speed-limiting safety control system.
Background
At present, a tensioning wheel and a heavy hammer are hung below a speed-limiting steel wire rope of an elevator to enable the speed-limiting steel wire rope to maintain a vertical state, when the falling speed of the elevator is too high or other unexpected conditions occur, the speed-limiting steel wire rope is used for driving a speed limiter to reduce the speed of the elevator, the speed limiter is driven to temporarily lock the elevator in emergency, and the elevator is usually stopped at a position which does not correspond to a flat floor, namely, a car door is not aligned with a hall door and the car door cannot be opened, so that the elevator is trapped. The switch of the triggering speed limiter is a tensioner switch arranged on the wheel frame of the tensioner. Because the wheel frame has certain height limit and the lifting amplitude of the wheel frame is limited, the tension wheel switch is arranged on the wheel frame, the lifting amplitude of the switch is limited, and the speed-limiting steel wire rope usually has the property of thermal expansion and cold contraction, in particular to a building with higher floor, after the stretching amplitude of the speed-limiting steel wire rope exceeds the limit, the elevator is triggered to stop running under the condition of safety, so that the elevator is in operation fault. Most of the conditions are elevator safety, and the speed-limiting steel wire rope is extended during operation, and only the installation condition of the speed-limiting steel wire rope is adjusted to enable the position of the wheel frame to be raised, so that the position of the tension roller switch is raised. However, heretofore, elevators have been trapped in the car and had to wait for specialized elevator maintenance personnel to rescue, often for more than ten minutes or even half an hour or more, and the waiting time and waiting urgency have been generally uncomfortable and afraid for the occupants.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an elevator speed-limiting safety control system capable of rapidly rescuing trapped people.
In order to solve the technical problems, the invention adopts the following technical scheme: the elevator speed-limiting safety control system comprises a speed limiter, a speed-limiting steel wire rope, a tension pulley, a heavy hammer, a tension pulley switch, a switching switch and a tension pulley standby switch, wherein the speed limiter ascends and descends along with an elevator car, the speed-limiting steel wire rope is installed on the elevator frame and is fixedly connected with the speed limiter, the tension pulley is ridden at the bottom end of the speed-limiting steel wire rope, the heavy hammer is connected with the wheel shaft of the tension pulley and is used for tensioning the speed-limiting steel wire rope by a counterweight, the tension pulley switch is installed on the wheel shaft of the tension pulley, the tension pulley switch is connected with an elevator host controller in series, the elevator speed-limiting safety control system further comprises the switching switch and the tension pulley standby switch which is arranged in parallel with the tension pulley switch, the triggering distance of the tension pulley standby switch is larger than that of the tension pulley switch, and the switching switch is connected with the speed-limiting safety control system in parallel.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the speed-limiting safety control system is provided with a switching device comprising the switching switch, and the switching device is in electric signal transmission connection with an elevator host controller and in electric signal control connection with the switching switch.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the elevator host controller is in electric signal conduction connection with the speed limiter.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the triggering distance of the spare switch of the tension roller is at least 1 millimeter larger than that of the switch of the tension roller.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the triggering distance of the standby switch of the tension roller is 2-15 mm greater than that of the switch of the tension roller.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the triggering distance of the standby switch of the tension roller is 5 mm greater than that of the switch of the tension roller.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the speed-limiting safety control system is provided with a wheel frame for installing a tension wheel shaft and hanging the heavy hammer, and a fixed support which is horizontally arranged and can touch the trigger distance of a top switch, and the tension wheel switch and a tension wheel standby switch are arranged on the wheel frame.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the telescopic quantity of the tension roller switch is larger than the distance difference between the tension roller switch and the fixed support and between the tension roller standby switch and the fixed support.
As an improvement of the technical scheme of the elevator speed-limiting safety control system, the change-over switch is a relay.
The invention has the beneficial effects that: because the speed-limiting safety control system of the elevator is provided with the spare switch of the tension roller, the installation position is larger than the distance between the tension roller switch and the trigger frame, the tension roller switch firstly touches the trigger frame to cause the elevator to perform fault alarm so as to immediately stop running, and the elevator is usually stopped at a position which does not correspond to a flat layer, namely, the elevator door is not aligned with the hall door and can not be opened, so that the elevator is trapped. When the situation causes people to be trapped, the system control or manual operation enables the change-over switch to be closed, so that the loop where the spare switch of the tension roller is located is conducted, the loop where the switch of the tension roller is located is replaced, and the elevator is kept to run to the flat floor position to rescue people trapped in the elevator car.
Drawings
Fig. 1 is a schematic diagram of the construction of an elevator speed limit safety control system of the present invention.
Fig. 2 is a schematic diagram of the structure of an elevator and its speed-limiting safety control system.
Fig. 3 is a schematic view of a partial elevation structure of an elevator speed limit safety control system.
Fig. 4 is a schematic rear perspective view of a portion of the elevator speed limit security system of fig. 3.
Detailed Description
Specific embodiments of the present invention will be further described below with reference to the accompanying drawings.
As shown in fig. 1, the elevator speed-limiting safety control system comprises a speed limiter 12 which is lifted along with an elevator car 11, a speed-limiting steel wire rope 21 which is arranged on an elevator frame and fixedly connected with the speed limiter 12, a tension pulley 22 which is ridden at the bottom end of the speed-limiting steel wire rope 21 and is used for tightening the speed-limiting steel wire rope 21, a heavy hammer 23 which is connected with a wheel shaft of the tension pulley 22 and is used for tightening the speed-limiting steel wire rope 21 by a counterweight, and a tension pulley switch 25 which is arranged on the wheel shaft of the tension pulley 22, wherein the tension pulley switch 25 and an elevator host controller 15 are connected in series to form a daily speed-limiting safety control loop, the elevator speed-limiting safety control system further comprises a change-over switch 18 and a tension pulley standby switch 26 which is arranged in parallel with the tension pulley switch 25, and the triggering distance of the tension pulley standby switch 26 is larger than that of the tension pulley switch 25, and the tension pulley standby switch 26 is connected in parallel with the tension pulley switch 25 after being connected in series with the change-over switch 18. Because the speed-limiting safety control system of the elevator is provided with the tension roller standby switch 26, the installation position is larger than the tension roller switch 25, and the tension roller switch 25 firstly touches the trigger frame to cause the elevator to fail and alarm, so that the elevator immediately stops running, and the elevator usually stops at a position which does not correspond to a flat floor, namely, the elevator door is not aligned with the hall door and can not be opened, so that the elevator is trapped. When the situation causes people to be trapped, the system control or manual operation enables the change-over switch 18 to be closed, the loop of the spare switch 26 of the tension roller is conducted, the loop of the switch 25 of the tension roller is replaced, and the elevator is kept to run to the flat floor position to rescue the trapped elevator.
More preferably, the speed limiting safety control system is provided with a switching device 16 in electric signal control connection with the switching switch 18, and the switching device 16 is in electric signal transmission connection with the elevator host controller 15. When the elevator fault triggered by the tension roller switch 25 of the elevator judges that the elevator is not an essential fault, the switching device 16 is instructed by the elevator host controller 15 to control the switching switch 18 to be closed, so that a standby circuit where the tension roller standby switch 25 is located is temporarily conducted for rescue, and personnel trapped in the elevator car are rescued. Of course, the elevator maintenance personnel can also remotely control the opening and closing of the switch 18, or manually close the switch 18 in the field to temporarily use a standby circuit to operate the elevator until the rescue of the trapped personnel in the elevator car is completed.
Preferably, the elevator host controller 15 is electrically connected to the speed limiter 12, acquires the fault condition of the speed limiter 12, and releases the locking of the speed limiter 12 to the elevator when the standby circuit is started.
More preferably, the trigger distance of the tensioner backup switch 26 is at least 1 mm greater than the trigger distance of the tensioner switch 25. Specifically, the fixed brackets triggering the tension roller switch 25 and the tension roller standby switch 26 are horizontally arranged, the installation directions of the tension roller switch 25 and the tension roller standby switch 26 are consistent, the installation position of the tension roller standby switch 26 is slightly higher than that of the tension roller switch 25, and the tension roller standby switch 26 can still be normally used when the tension roller switch 25 is triggered to be disconnected. The fixed bolster can set up to echelonment, and the tight pulley switch 25 and the tight pulley spare switch 26 that rises are triggered respectively to different steps, and under this case, tight pulley switch 25 and tight pulley spare switch 26 that rises can install in same high position, and tight pulley spare switch 26 that rises can install even lower.
Preferably, the triggering distance of the spare tension roller switch 26 is 2-15 mm greater than that of the tension roller switch 25, and when the tension roller switch 25 is triggered to be opened, the spare tension roller switch 26 is still closed for standby. More preferably, the triggering distance of the spare switch 26 of the tensioner is 5 mm greater than that of the switch 25 of the tensioner, so that a more appropriate distance is obtained, and the spare switch 26 of the tensioner is not closed but still kept for standby.
Specifically, the speed-limiting safety control system is provided with a wheel frame 28 for installing the wheel shaft of the tension wheel 22 and hanging the heavy hammer, and a fixed bracket 31 which is horizontally arranged and can touch the trigger distance of the top switch, wherein the wheel frame 28 can move in the fixed bracket 31 to keep balance, and the fixed bracket 31 is used for triggering the tension wheel switch besides keeping the balance of the wheel frame. The tensioner switch 25 and the tensioner backup switch 26 are mounted on the wheel frame 28, so that the two switches are mounted stably and reliably and balanced.
More preferably, the telescopic capacity of the tensioner switch 25 is greater than the distance difference between the tensioner switch 25 and the tensioner backup switch 26 and the fixed bracket 31, so that the two switches are triggered simultaneously due to the failure caused by the natural extension of the non-speed-limiting wire rope, and the backup circuit where the tensioner backup switch 26 is located cannot be used for rescue, thereby avoiding danger of misoperation.
Preferably, the change-over switch is a relay, so that the circuit can be switched conveniently and quickly.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (4)
1. The utility model provides an elevator speed limit safety control system, includes the overspeed governor that goes up and down along with elevator car, installs in the elevator frame and with overspeed governor fixed connection's speed limit wire rope, ride in the tight pulley of tensioning speed limit wire rope of speed limit wire rope bottom department, with the shaft connection of the tight pulley and the counter weight make the tight weight of speed limit wire rope, install in the tight pulley's of tensioning pulley's shaft the tight pulley switch that rises, the tight pulley switch that rises and elevator host computer controller establish ties, its characterized in that: the elevator speed-limiting safety control system further comprises a change-over switch and a tension roller standby switch which is arranged in parallel with the tension roller switch, wherein the triggering distance of the tension roller standby switch is larger than that of the tension roller switch, and the tension roller standby switch is connected with the change-over switch in series and then connected with the tension roller switch in parallel to the speed-limiting safety control system; the speed-limiting safety control system is provided with a switching device comprising a switching switch, wherein the switching device is in electric signal transmission connection with an elevator host controller and in electric signal control connection with the switching switch; the elevator host controller is in electric signal conduction connection with the speed limiter; the triggering distance of the spare switch of the tension roller is at least 1 millimeter greater than that of the switch of the tension roller; the speed limiting safety control system is provided with a wheel frame for installing a tension wheel axle and hanging the heavy hammer, and a fixed bracket which is horizontally arranged and can touch the trigger distance of a top switch, and the tension wheel switch and a tension wheel standby switch are arranged on the wheel frame; the telescopic quantity of the tension roller switch is larger than the distance difference between the tension roller switch and the spare tension roller switch and the fixed support.
2. The elevator speed limit security system of claim 1, wherein: the trigger distance of the spare switch of the tension roller is 2-15 mm greater than that of the switch of the tension roller.
3. The elevator speed limit security system of claim 2, wherein: the trigger distance of the spare switch of the tension roller is 5 mm greater than that of the switch of the tension roller.
4. The elevator speed limit security system of claim 1, wherein: the change-over switch is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136318.0A CN108217502B (en) | 2018-02-09 | 2018-02-09 | Elevator speed-limiting safety control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810136318.0A CN108217502B (en) | 2018-02-09 | 2018-02-09 | Elevator speed-limiting safety control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108217502A CN108217502A (en) | 2018-06-29 |
| CN108217502B true CN108217502B (en) | 2024-01-12 |
Family
ID=62661414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810136318.0A Active CN108217502B (en) | 2018-02-09 | 2018-02-09 | Elevator speed-limiting safety control system |
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| Country | Link |
|---|---|
| CN (1) | CN108217502B (en) |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4023336A (en) * | 1974-06-26 | 1977-05-17 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung | Yarn reserve forming and moving apparatus |
| DE19736183C1 (en) * | 1997-08-13 | 1999-02-04 | Schleicher Relais | Safety switch arrangement for safety circuit with at least one channel |
| CN1882490A (en) * | 2004-08-27 | 2006-12-20 | 三菱电机株式会社 | Elevator apparatus |
| CN2868033Y (en) * | 2006-03-02 | 2007-02-14 | 谢兴华 | Rotary show device |
| JP2007197118A (en) * | 2006-01-24 | 2007-08-09 | Toshiba Elevator Co Ltd | Governor |
| JP2009062176A (en) * | 2007-09-07 | 2009-03-26 | Toshiba Elevator Co Ltd | Elevator |
| CN101472825A (en) * | 2006-06-30 | 2009-07-01 | 奥蒂斯电梯公司 | Safety device for ensuring minimum space on top or bottom of elevator well channel when examining as well as elevator with the safety device |
| CN102459049A (en) * | 2009-06-22 | 2012-05-16 | 三菱电机株式会社 | Elevator device |
| CN102602816A (en) * | 2012-03-30 | 2012-07-25 | 刘德明 | Stroke double-insurance device for hook of bridge crane |
| CN202754402U (en) * | 2012-09-24 | 2013-02-27 | 深圳市华星光电技术有限公司 | Automatic van |
| CN202766072U (en) * | 2012-09-18 | 2013-03-06 | 苏州默纳克控制技术有限公司 | Maintenance cover plate detecting system and escalator system |
| CN103754727A (en) * | 2014-01-23 | 2014-04-30 | 成都西子孚信科技有限公司 | Elevator tensioning device |
| CN204751772U (en) * | 2014-12-31 | 2015-11-11 | 允成机电科技(上海)有限公司 | Upper and lower slotted of home use elevator rises and tightly installs |
| CN206427888U (en) * | 2016-12-11 | 2017-08-22 | 河北国迅机电设备销售有限公司 | A kind of lift car SOS self-help apparatus |
| CN206692163U (en) * | 2017-04-10 | 2017-12-01 | 西继迅达（许昌）电梯有限公司 | A kind of elevator pit signal pickup assembly and system |
| CN207861648U (en) * | 2018-01-19 | 2018-09-14 | 重庆玖玖新能源有限公司 | A kind of expansion tightening wheel switch redundancy detection device |
| CN208135790U (en) * | 2018-02-09 | 2018-11-23 | 广东亚太西奥电梯有限公司 | A kind of elevator speed limit Safety system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE502005000701D1 (en) * | 2005-03-05 | 2007-06-21 | Thyssenkrupp Aufzugswerke Gmbh | elevator system |
-
2018
- 2018-02-09 CN CN201810136318.0A patent/CN108217502B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4023336A (en) * | 1974-06-26 | 1977-05-17 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung | Yarn reserve forming and moving apparatus |
| DE19736183C1 (en) * | 1997-08-13 | 1999-02-04 | Schleicher Relais | Safety switch arrangement for safety circuit with at least one channel |
| CN1882490A (en) * | 2004-08-27 | 2006-12-20 | 三菱电机株式会社 | Elevator apparatus |
| JP2007197118A (en) * | 2006-01-24 | 2007-08-09 | Toshiba Elevator Co Ltd | Governor |
| CN2868033Y (en) * | 2006-03-02 | 2007-02-14 | 谢兴华 | Rotary show device |
| CN101472825A (en) * | 2006-06-30 | 2009-07-01 | 奥蒂斯电梯公司 | Safety device for ensuring minimum space on top or bottom of elevator well channel when examining as well as elevator with the safety device |
| JP2009062176A (en) * | 2007-09-07 | 2009-03-26 | Toshiba Elevator Co Ltd | Elevator |
| CN102459049A (en) * | 2009-06-22 | 2012-05-16 | 三菱电机株式会社 | Elevator device |
| CN102602816A (en) * | 2012-03-30 | 2012-07-25 | 刘德明 | Stroke double-insurance device for hook of bridge crane |
| CN202766072U (en) * | 2012-09-18 | 2013-03-06 | 苏州默纳克控制技术有限公司 | Maintenance cover plate detecting system and escalator system |
| CN202754402U (en) * | 2012-09-24 | 2013-02-27 | 深圳市华星光电技术有限公司 | Automatic van |
| CN103754727A (en) * | 2014-01-23 | 2014-04-30 | 成都西子孚信科技有限公司 | Elevator tensioning device |
| CN204751772U (en) * | 2014-12-31 | 2015-11-11 | 允成机电科技(上海)有限公司 | Upper and lower slotted of home use elevator rises and tightly installs |
| CN206427888U (en) * | 2016-12-11 | 2017-08-22 | 河北国迅机电设备销售有限公司 | A kind of lift car SOS self-help apparatus |
| CN206692163U (en) * | 2017-04-10 | 2017-12-01 | 西继迅达（许昌）电梯有限公司 | A kind of elevator pit signal pickup assembly and system |
| CN207861648U (en) * | 2018-01-19 | 2018-09-14 | 重庆玖玖新能源有限公司 | A kind of expansion tightening wheel switch redundancy detection device |
| CN208135790U (en) * | 2018-02-09 | 2018-11-23 | 广东亚太西奥电梯有限公司 | A kind of elevator speed limit Safety system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108217502A (en) | 2018-06-29 |
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Denomination of invention: An elevator speed limit and safety control system Granted publication date: 20240112 Pledgee: Agricultural Bank of China Limited by Share Ltd. Nanhai Lishui branch Pledgor: GUANGDONG APXO ELEVATOR Co.,Ltd. Registration number: Y2024980011464 |