CN104071667A - Car accidental movement prevention protecting system - Google Patents
Car accidental movement prevention protecting system Download PDFInfo
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- CN104071667A CN104071667A CN201410189834.1A CN201410189834A CN104071667A CN 104071667 A CN104071667 A CN 104071667A CN 201410189834 A CN201410189834 A CN 201410189834A CN 104071667 A CN104071667 A CN 104071667A
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- switch
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- door
- bearing pin
- accidental movement
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Abstract
The invention relates to a car accidental movement prevention protecting system. The car accidental movement prevention protecting system solves the problem of accidental movement of a car which leaves a landing due to the facts that a landing door is not locked or a car door is not closed. The car accidental movement prevention protecting system comprises a control panel and a protection executing mechanism; the signal input end of the control panel is connected with a door closing in-position switch, a door lock contactor switch and a door area switch, and the signal output end of the control panel is connected with the protection executing mechanism. The car accidental movement prevention protecting system has the advantages of achieving diversification in protection triggering and improving the safety of avoiding the accidental movement of the car, so that the safety of the car can be protected in advance when the landing door is not locker or the car door is not closed no matter whether the accidental movement of the car is detected or not. The car accidental movement prevention protecting system is significant to protecting equipment safety of an elevator and the human safety of passengers, simple in structure, simple and flexible in action, safe, reliable and high in practicality.
Description
Technical field
The present invention relates to elevator technology field, especially relate to one and prevent car accidental movement protection system.
Background technology
The protection of car accidental movement is one of main contents of current elevator industry research; be mainly with stop car at layer non-locking door tight and car door do not close the accidental movement that leaves stop in situation; this accidental movement is to move in the elevator drive main frame that relies on or driving control system any single part and lost efficacy and cause due to car safety, has become one of important parameter of inspection elevator safety performance.In prior art, for this problem, many different designs are proposed, if patent publication No. is CN103466407A, a kind of car accidental movement fender guard relating to, comprises independent door lock contact, hoistway inductive switch, UCMP control circuit board, elevator device input monitoring device, band-type brake power supply, output-controlling device and band-type brake; UCMP control circuit board is connected with independent door lock contact, hoistway inductive switch, elevator device input monitoring device and output-controlling device respectively; band-type brake power supply connects described band-type brake by output-controlling device; on the basis of original elevator device, newly increase a set of elevator protection device, whether opening the accidental movement of door for detection of lift car.If patent publication No. is CN103420243A, disclosed a kind of accidental movement of elevator cage protection mechanism, being provided with a kind of flip flop equipment of identifying elevator cage door opening and a kind ofly not meeting accident under closed condition when mobile at elevator cage door, there is the linkage linking in the executive device and a kind of flip flop equipment and the executive device of making that car are carried out immediately to locking; Flip flop equipment adopts mechanical type trigger architecture, and executive device adopts latch segment formula locking structure, and linkage adopts interlock rope structure.For another example patent announcement number is a kind of guide tracked fender guard of folder that prevents car accidental movement of CN202296670U; comprise the U-shaped mount pad that is installed on sedan-chair frame upper beam; U-shaped mouthful of two ends of U-shaped mount pad are provided with electromagnetic spool device; electromagnetic spool device is connected with holddown spring; holddown spring is connected with brake shoes assembly, electromagnetic spool device electrical connection elevator control circuit plate.These devices or structure are too complicated above, and self just exists higher safe contingency probability, or too simple, low to the practical value of product.The triggering form of above unit protection action is more single in addition, at the electrical motor of driven by power main frame, and drg, coupler, axle or driving device lost efficacy, and control system was while losing efficacy, can not trigger protection effect, safety is not high.
Summary of the invention
The present invention be mainly solved car at layer non-locking door tight and car door do not close in situation; leave the accidental movement problem of stop; provide a kind of simple and reasonable, protection trigger many, safety performance is better, speed of response soon, low speed, have length spacing prevent car accidental movement protection system.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: one prevents car accidental movement protection system; comprise the control desk of identifying lift car state and the protection actuating unit that according to control desk instruction, elevator is carried out locking; the signal input part of described control desk be connected with respectively detect car door whether door-closing in-place door-closing in-place switch, door lock whether door lock contactless contactor, the car of locking whether arrive Men district of a district switch, on the signal output part of control desk, be connected to protection actuating unit.In the present invention, door-closing in-place is opened for detection of whether door-closing in-place of car door, disconnects this switch in the time of elevator door-closing in-place, and signal disconnects, if elevator door closing does not put in place, and trigger switch not, signal sends to control desk.Whether door lock contactless contactor detects door lock and locks, and under door lock stable condition, door lock contactless contactor disconnects, and signal disconnects.If door lock is locking, not trigger gate latch contact switch, transmits a signal to control desk.Control desk receives the information of lift car state, and door district switch detects car and whether arrives district's scope, arrives door district scope at car, and trigger gate district switch, transmits a signal to control desk, if do not arrive door district, and Ze Bu trigger gate district switch, signal disconnects.Control desk detects the signal of each switch, receiving after door-closing in-place switch, door lock contactless contactor He Men district on-off signal, and mouth output signal, the action of trigger protection actuating unit, carries out accidental movement protection to car.The present invention prevents the electrical motor due to driven by power main frame, drg, coupler, axle or driving device lost efficacy, and control system lost efficacy and caused at layer door in not locked position and car during in off position not, car meets accident and leaves the movement of stop, has further ensured passenger's safety.
As a kind of preferred version of such scheme, on the input end of described control desk, be also connected with open the door again flat bed signal switch and gate advance door opening step switch.Have on some elevators and also there is open the door again story-leveling function and advance door opening function, the flat bed signal switch again that opens the door, flat bed again after whether the flat bed signal switch that opens the door again detects elevator and open the door, if transmitted signal, if not cut-off signal.Gate advance door opening step switch detects whether advance door opening of gate, and the switch transmitted signal if advance door opening sets out, if cut-off signal of advance door opening not.Control desk using door-opened elevator again the action of flat bed and advance door opening also move as protection, further ensured the safety of elevator.
As a kind of preferred version of such scheme, on the input end of described control desk, be also connected with overhauling elevator switch and device disable switch.Whether overhauling elevator switch detects elevator in inspecting state, is transmitted signal, otherwise cut-off signal.Whether device disable switch detects elevator and is deactivated, if send information, otherwise cut-off signal.Control desk is also listed overhauling elevator state and elevator dead status in protection action, prevents that elevator from moving under maintenance or dead status because losing efficacy, and further improved the safety of elevator.
As a kind of preferred version of such scheme, described protection actuating unit comprises the link plate being arranged on guide rail, with the fixing support of car frame upper beam, on link plate, be provided with spacing hole, in support, be provided with bearing pin, bearing pin front end is corresponding with link plate upper limit hole, bearing pin rear end is connected with actuating device, actuating device comprises safety switch, switch re-packs and push electric magnet, bearing pin rear end is connected with push electric magnet, switch re-packs and is connected on bearing pin rear end, switch re-packs and contacts with safety switch, the coil of push electric magnet is connected on the mouth of control desk, .Push electric magnet is worked by control desk control, in the time that control desk mouth sends signal, push electric magnet is started working, push electric magnet pull switch re-packs and moves forward, switch re-packs and drives bearing pin to travel forward, bearing pin is inserted in the spacing hole of link plate, locks, limited the accidental movement region of car.Re-pack at switch simultaneously mobile, switch re-packs and can trigger the safety switch of contact with it simultaneously, and it is out of service that safety switch disconnects elevator, and effective like this control system operation elevator that prevented, has ensured elevator safety.In the time meeting elevator condition of service, control desk mouth cut-off signal, push electric magnet quits work, and latch is retracted naturally, and safety switch is connected, and elevator recovers normal operation.
As a kind of preferred version of such scheme, described support is that bar shaped is tabular, in the middle of support, be bent to form square bending, the two ends of support are bolted on respectively on car frame upper beam, on the both sides of bending, be respectively arranged with through hole, described bearing pin is vertical with guide rail, bearing pin is horizontally through two through holes of the bending of support, be transverse on support, in the bearing pin part that is positioned at bending, cover has retracing spring, retracing spring front end withstands in a side of close guide rail of bending, and retracing spring rear end is connected on bearing pin.This support is used for placing bearing pin, also bearing pin is played to directional tagging simultaneously.Retracing spring plays reset response, quits work in push electric magnet, and retracing spring meeting pushing pin is axially rear mobile, makes bearing pin deviate from spacing hole.
As a kind of preferred version of such scheme, the described switch one end that re-packs is bent to form the installation portion being connected with bearing pin, the switch horizontally set that re-packs, installation portion and bearing pin rear end are fixed, on re-packing, switch is provided with the groove matching with safety switch work, described safety switch is positioned at the switch below that re-packs, and is provided with contact pinch roller on safety switch, and the lower surface that re-packs with switch of contact pinch roller contacts.Switch re-packs for triggering safety switch, and in bearing pin does not insert spacing hole time, the pinch roller of safety switch is positioned at the groove that switch re-packs, and now safety switch disconnects, and elevator is in normal operating condition.In bearing pin is inserted into spacing hole time, switch re-packs and moves forward one end distance, and the contact pinch roller of safety switch leaves groove and the switch lower surface that re-packs and contacts, and now contacts pinch roller and is in the oppression state, and connects safety switch, and elevator is out of service.
As a kind of preferred version of such scheme, described push electric magnet comprises promote-side, and promote-side front end is provided with connecting screw rod, and connecting screw rod front end is fixed on bearing pin rear end.
As a kind of preferred version of such scheme, the spacing hole on described link plate is the slotted hole along rail length direction, slotted hole length H, 200≤H≤500mm.
Therefore, advantage of the present invention is: trigger protection is various, has improved the safety of the anti-accidental movement of car, can successfully manage the electrical motor of driven by power main frame, drg, and coupler, axle or driving device lost efficacy, and the situation of control system inefficacy.The lift car movement that whether meets accident no matter whether detected; all can make car at layer non-locking door tight and car door do not close in situation; in advance car is carried out to safety precaution; significant to protection lift facility safety, passenger's personal safety; simple in structure, move simple and direct flexibly, safe and reliable, practical.
Brief description of the drawings
Accompanying drawing 1 is a kind of circuit structure frame diagram of the present invention;
Accompanying drawing 2 is a kind of structural representations of protecting actuating unit in the present invention;
Accompanying drawing 3 is the structure for amplifying schematic diagrams at A place in accompanying drawing 2.
The 1-control desk 2-protection actuating unit 3-overhauling elevator switch 4-door lock contactless contactor 5-door-closing in-place switch 6-flat bed signal switch 7-advance door opening step switch 8-Men district switch 9-device disable switch 10-guide rail 11-link plate 12-car frame upper beam 13-support 14-bending 15-safety switch 16-push electric magnet 17-retracing spring 18-switch 19-promote-side 20-bearing pin 21-groove 22-contact pinch roller 23-connecting screw rod that re-packs that opens the door again.
Detailed description of the invention
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
The present embodiment one prevents car accidental movement protection system; as shown in Figure 1; comprise the control desk 1 of identification lift car state and according to control desk instruction, elevator carried out the protection actuating unit 2 of locking, the signal input part of control desk be connected with respectively detect car door whether the door-closing in-place switch 5, door lock of door-closing in-place whether door lock contactless contactor 4, the car of locking arrive Men district of a district switch 8, the flat bed signal switch 6 that opens the door again, gate advance door opening step switch 7, overhauling elevator switch 3 and device disable switch 9.On the signal output part of control desk, be connected to protection actuating unit.
As shown in Figure 2, protection actuating unit comprises the link plate 11 being arranged on guide rail 10, with the fixing support 13 of car frame upper beam 12, is provided with spacing hole on link plate, and spacing hole is the slotted hole along rail length direction, and slotted hole length is 300mm.In support, be provided with bearing pin 20, bearing pin front end is corresponding with link plate upper limit hole, and bearing pin rear end is connected with actuating device.
Support is that bar shaped is tabular, in the middle of support, be bent to form square bending 14, the two ends of support are bolted on respectively on car frame upper beam 12, on the both sides of bending, be respectively arranged with through hole, bearing pin 20 is vertical with guide rail, and bearing pin is horizontally through two through holes of the bending of support, be transverse on support, in the bearing pin part that is positioned at bending, cover has retracing spring 17, retracing spring front end to withstand in a side of close guide rail of bending, and retracing spring rear end is connected on bearing pin.
Actuating device comprises that safety switch 15, switch re-pack 18 and push electric magnet 16, bearing pin 20 rear ends are connected with push electric magnet, as shown in Figure 2, the switch one end that re-packs is bent to form the installation portion being connected with bearing pin, the switch horizontally set that re-packs, installation portion and bearing pin rear end are fixed, and are provided with the groove 21 matching with safety switch work on switch re-packs, switch re-packs and contacts with safety switch, and the coil of push electric magnet is connected on the mouth of control desk.Safety switch is positioned at the switch below that re-packs, and is provided with contact pinch roller 22 on safety switch, and the lower surface that re-packs with switch of contact pinch roller contacts.Push electric magnet comprises promote-side 19, and promote-side front end is provided with connecting screw rod 23, and connecting screw rod front end is fixed on bearing pin rear end.
Course of action is as follows:
One, when elevator is under normal operating condition, from running state transfers ramp to stop to and opens the door, door-closing in-place switch, door lock contactless contactor disconnect, and door district signal is effective.Now, native system sends and stretches out bearing pin instruction, bearing pin is inserted in the link plate spacing hole in flat bed region, the safety switch of monitoring bearing pin disconnects, in case locking system provides operating instruction, limited the moving section under the non-driven state of car simultaneously, upper and lower be aggregated in 300mm within.After door is closed, door-closing in-place switch, door lock contactless contactor closure, control desk mouth disconnects, and push electric magnet power-off, is resetted bearing pin by retracing spring, and safety switch allows elevator to start operation simultaneously.
Two, elevator is in the time that opening the door of normal condition received guests, and bearing pin is all the time in being inserted in link plate spacing hole state, only has when door lock closure and door-closing in-place signal are when effective, just makes push electric magnet power-off and ensures that bearing pin resets.In the time again opening the door, bearing pin inserts again.
Three, open the door again story-leveling function and advance door opening function of elevator, action protection can be selected.If selected more than when protection need consider that link plate spacing hole length should be greater than the twice of the advance door opening distance of control system and the flat bed operating distance that opens the door again, when preventing this device action with advance door opening and interfering with each other of moving of flat bed again.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although more used the terms such as control desk, protection actuating unit, overhauling elevator switch, door lock contactless contactor, door-closing in-place switch herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present invention; They are construed to any additional restriction is all contrary with spirit of the present invention.
Claims (8)
1. one kind prevents car accidental movement protection system; it is characterized in that: comprise the control desk (1) of identifying lift car state and the protection actuating unit (2) that according to control desk instruction, elevator is carried out locking; the signal input part of described control desk be connected with respectively detect car door whether door-closing in-place door-closing in-place switch (5), door lock whether door lock contactless contactor (4), the car of locking whether arrive Men district of a district switch (8), on the signal output part of control desk, be connected to protection actuating unit.
2. one according to claim 1 prevents car accidental movement protection system, it is characterized in that being also connected with on the input end of described control desk (1) open the door flat bed signal switch (6) and gate advance door opening step switch (7) again.
3. one according to claim 1 and 2 prevents car accidental movement protection system, it is characterized in that being also connected with overhauling elevator switch (3) and device disable switch (9) on the input end of described control desk (1).
4. one according to claim 1 prevents car accidental movement protection system, it is characterized in that described protection actuating unit comprises the link plate (11) being arranged on guide rail (10), with the fixing support (13) of car frame upper beam (12), on link plate, be provided with spacing hole, in support, be provided with bearing pin (20), bearing pin front end is corresponding with link plate upper limit hole, bearing pin rear end is connected with actuating device, actuating device comprises safety switch (15), switch re-packs (18) and push electric magnet (16), bearing pin rear end is connected with push electric magnet, switch re-packs and is connected on bearing pin rear end, switch re-packs and contacts with safety switch, the coil of push electric magnet is connected on the mouth of control desk.
5. one according to claim 4 prevents car accidental movement protection system, it is characterized in that described support (13) is that bar shaped is tabular, in the middle of support, be bent to form square bending (14), the two ends of support are bolted on respectively on car frame upper beam (12), on the both sides of bending, be respectively arranged with through hole, described bearing pin (20) is vertical with guide rail (10), bearing pin is horizontally through two through holes of the bending of support, be transverse on support, in the bearing pin part that is positioned at bending, cover has retracing spring (17), retracing spring front end withstands in a side of close guide rail of bending, retracing spring rear end is connected on bearing pin.
6. prevent car accidental movement protection system according to the one described in claim 4 or 5; it is characterized in that described switch (18) one end that re-packs is bent to form the installation portion being connected with bearing pin; the switch horizontally set that re-packs; installation portion and bearing pin rear end are fixed; on re-packing, switch is provided with the groove (21) matching with safety switch work; described safety switch (15) is positioned at the switch below that re-packs, and is provided with contact pinch roller (22) on safety switch, and the lower surface that re-packs with switch of contact pinch roller contacts.
7. prevent car accidental movement protection system according to the one described in claim 4 or 5; it is characterized in that described push electric magnet (16) comprises promote-side (19); promote-side front end is provided with connecting screw rod (23), and connecting screw rod front end is fixed on bearing pin (20) rear end.
8. prevent car accidental movement protection system according to the one described in claim 4 or 5, it is characterized in that the spacing hole on described link plate (11) is the slotted hole along guide rail (10) length direction, slotted hole length H, 200≤H≤500mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410189834.1A CN104071667A (en) | 2014-05-07 | 2014-05-07 | Car accidental movement prevention protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410189834.1A CN104071667A (en) | 2014-05-07 | 2014-05-07 | Car accidental movement prevention protecting system |
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| CN104071667A true CN104071667A (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410189834.1A Pending CN104071667A (en) | 2014-05-07 | 2014-05-07 | Car accidental movement prevention protecting system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104860147A (en) * | 2015-06-15 | 2015-08-26 | 北京安泰鸿源电梯设计有限公司 | Method for preventing accidental movement of elevator cage |
| CN105173954A (en) * | 2015-09-18 | 2015-12-23 | 江南嘉捷电梯股份有限公司 | Device for preventing lift car from moving by accident |
| CN106946114A (en) * | 2017-04-01 | 2017-07-14 | 嘉兴学院 | Elevator coordinated operation accident warning device and method based on sensing combination parameter |
| CN107352370A (en) * | 2017-07-31 | 2017-11-17 | 快意电梯股份有限公司 | Prevent the protection device of accidental movement of elevator cage |
| CN107416636A (en) * | 2017-08-21 | 2017-12-01 | 王治刚 | Accidental movement of elevator cage and up-running over-speed protection control panel |
| CN107902529A (en) * | 2017-12-15 | 2018-04-13 | 杭州奥立达电梯有限公司 | Elevator cage door completely closes verification protective device |
| CN108483174A (en) * | 2018-06-07 | 2018-09-04 | 林肯电梯(中国)有限公司 | A kind of car door using extension spring rescues unlocking apparatus |
| CN109626163A (en) * | 2018-12-21 | 2019-04-16 | 深圳技术大学（筹） | The monitoring method and device of door-opened elevator operation troubles |
| CN109956388A (en) * | 2017-12-14 | 2019-07-02 | 陕西小溪机电科技有限公司 | Elevator landing solution lock linkage device and its control method |
| CN110526064A (en) * | 2019-09-12 | 2019-12-03 | 上海三菱电梯有限公司 | Accidental movement of elevator cage protects System Functional Test device |
| CN110745673A (en) * | 2019-09-30 | 2020-02-04 | 苏州汇川技术有限公司 | Elevator safety operation method, system, equipment, medium and safety function device |
| CN112141848A (en) * | 2020-10-08 | 2020-12-29 | 宁波御墅富士电梯有限公司 | Safety component for preventing elevator car from moving accidentally |
| CN113682925A (en) * | 2021-08-27 | 2021-11-23 | 日立电梯（中国）有限公司 | Device for realizing UCMP function and transformation method |
| CN114701931A (en) * | 2022-03-07 | 2022-07-05 | 陈小平 | Elevator operation safety detection device with remote control function |
| CN115092786A (en) * | 2022-05-30 | 2022-09-23 | 宁波宏大电梯有限公司 | Automatic maintenance platform for elevator car without machine room and using method of maintenance platform |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104860147B (en) * | 2015-06-15 | 2017-10-17 | 北京安泰鸿源电梯设计有限公司 | Prevent accidental movement of elevator cage method |
| CN104860147A (en) * | 2015-06-15 | 2015-08-26 | 北京安泰鸿源电梯设计有限公司 | Method for preventing accidental movement of elevator cage |
| CN105173954A (en) * | 2015-09-18 | 2015-12-23 | 江南嘉捷电梯股份有限公司 | Device for preventing lift car from moving by accident |
| CN106946114A (en) * | 2017-04-01 | 2017-07-14 | 嘉兴学院 | Elevator coordinated operation accident warning device and method based on sensing combination parameter |
| CN106946114B (en) * | 2017-04-01 | 2019-03-12 | 嘉兴学院 | Elevator coordinated operation accident warning device and method based on induction combination parameter |
| CN107352370A (en) * | 2017-07-31 | 2017-11-17 | 快意电梯股份有限公司 | Prevent the protection device of accidental movement of elevator cage |
| CN107352370B (en) * | 2017-07-31 | 2023-09-05 | 快意电梯股份有限公司 | Protection device for preventing accidental movement of elevator car |
| CN107416636A (en) * | 2017-08-21 | 2017-12-01 | 王治刚 | Accidental movement of elevator cage and up-running over-speed protection control panel |
| CN107416636B (en) * | 2017-08-21 | 2023-01-03 | 王治刚 | Elevator car unexpected movement and up overspeed protection control panel |
| CN109956388A (en) * | 2017-12-14 | 2019-07-02 | 陕西小溪机电科技有限公司 | Elevator landing solution lock linkage device and its control method |
| CN107902529A (en) * | 2017-12-15 | 2018-04-13 | 杭州奥立达电梯有限公司 | Elevator cage door completely closes verification protective device |
| CN108483174A (en) * | 2018-06-07 | 2018-09-04 | 林肯电梯(中国)有限公司 | A kind of car door using extension spring rescues unlocking apparatus |
| CN109626163A (en) * | 2018-12-21 | 2019-04-16 | 深圳技术大学（筹） | The monitoring method and device of door-opened elevator operation troubles |
| CN110526064A (en) * | 2019-09-12 | 2019-12-03 | 上海三菱电梯有限公司 | Accidental movement of elevator cage protects System Functional Test device |
| CN110526064B (en) * | 2019-09-12 | 2021-07-30 | 上海三菱电梯有限公司 | Function testing device for elevator car accidental movement protection system |
| CN110745673A (en) * | 2019-09-30 | 2020-02-04 | 苏州汇川技术有限公司 | Elevator safety operation method, system, equipment, medium and safety function device |
| CN110745673B (en) * | 2019-09-30 | 2022-04-29 | 苏州汇川技术有限公司 | Elevator safety operation method, system, equipment, medium and safety function device |
| CN112141848A (en) * | 2020-10-08 | 2020-12-29 | 宁波御墅富士电梯有限公司 | Safety component for preventing elevator car from moving accidentally |
| CN113682925A (en) * | 2021-08-27 | 2021-11-23 | 日立电梯（中国）有限公司 | Device for realizing UCMP function and transformation method |
| CN113682925B (en) * | 2021-08-27 | 2023-03-07 | 日立电梯（中国）有限公司 | Device for realizing UCMP function and transformation method |
| CN114701931A (en) * | 2022-03-07 | 2022-07-05 | 陈小平 | Elevator operation safety detection device with remote control function |
| CN114701931B (en) * | 2022-03-07 | 2022-11-25 | 陈小平 | Elevator operation safety detection device with remote control function |
| CN115092786A (en) * | 2022-05-30 | 2022-09-23 | 宁波宏大电梯有限公司 | Automatic maintenance platform for elevator car without machine room and using method of maintenance platform |
| CN115092786B (en) * | 2022-05-30 | 2024-03-19 | 宁波宏大电梯有限公司 | Automatic maintenance platform for elevator car without machine room and use method of maintenance platform |
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Application publication date: 20141001 |