CN109250601A - A kind of emergency staircase of double insurance - Google Patents
A kind of emergency staircase of double insurance Download PDFInfo
- Publication number
- CN109250601A CN109250601A CN201811344297.8A CN201811344297A CN109250601A CN 109250601 A CN109250601 A CN 109250601A CN 201811344297 A CN201811344297 A CN 201811344297A CN 109250601 A CN109250601 A CN 109250601A
- Authority
- CN
- China
- Prior art keywords
- traction machine
- emergency staircase
- carriage
- insurance
- power
- 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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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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
-
- 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
-
- 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
- B66D5/04—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes actuated by centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/03—Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a kind of emergency staircase of double insurance, this kind of emergency staircase is using the centrifugal pan mechanically triggered, and simple and practical, not vulnerable to extraneous factor interference, it is adjustable, accurate to trigger；Insurance module and braking system are directly controlled by the centrifugal pan after triggering, so that the elevator of overspeed is obtained double brake, greatly improves the safety coefficient of elevator；Power operation is carried out to traction machine by insurance module, traction machine not only loses power after power-off, but also the brake on traction machine realizes braking maneuver, so that traction machine is reached locking state, to make deceleration of elevator or stopping by hoist ropes；Phenomenon of rupture caused by hoist ropes moment pulling force is excessive after traction machine power-off brake can be preferably prevented by braking system, the speed of service for controlling carriage while drawing protection again is realized to lift car.
Description
Technical field
The present invention relates to elevator technology fields, and in particular to a kind of emergency staircase of double insurance.
Background technique
Elevator is a kind of using motor as the vertical conveyor of power, be equipped with box-like gondola, for tier building multiply people or
Carrying cargo.Transport facility of the elevator as vertical direction has become important build in skyscraper and public place
Build equipment and indispensable.With the development of computer technology, automatic technology and power electronic technique, modem elevator at
For typical electromechanical integrated product.With the raising of whole national economy strength, the life consumption level of the people rises appreciably,
Real estate developer releases medium-to-high grade small high-rise and high-rise residential building energetically one after another, has driven increasing rapidly for residential lift,
Main growth factor as entire elevator market.
But increasing with floor, the requirement to elevator speed is also higher and higher, while elevator overspeed control
Difficulty is also just increasing, and what it is due to most of elevator is all to carry out reply elevator by the way of the protection of single car safety
Hypervelocity, this mode is often in elevator overspeed, by safety tongs and extraneous effect by carriage reduction of speed or stopping, but such as
Fruit safety tongs failure or safety tongs locking are abnormal, then elevator will result in immeasurable accident.
Summary of the invention
It is an object of the present invention in view of the above shortcomings of the prior art, propose a kind of emergency staircase of double insurance,
When hypervelocity, brake and braking system are directly triggered, keeps elevator out of service or slows down, reaches the mesh for the lower duplicate protection that exceeds the speed limit
's.
A kind of emergency staircase of double insurance proposed by the present invention, including hoistway, traction machine, carriage, counterweight and to
The wirerope for connecting the carriage and counterweight and being driven by the traction machine, the traction machine are equipped with to power off
When brake the traction machine brake, the traction machine further includes to synchronous with the traction sheave on the traction machine
Rotate and obtain the driving wheel of the instant revolving speed of the traction sheave, set on described driving wheel one end in the traction wheel speed
The centrifugal pan and one triggered when hypervelocity by centrifugal force makes the traction machine by the transmission of the centrifugal pan after triggering
The insurance module of power-off；It further include multiple to be controlled by the insurance module and be respectively arranged on the shaft bottom and top
Braking system and one end be connected to the car top and successively wind multiple braking systems, the other end connection described in
The safety rope of cage bottom.
Further, the braking system one is to wind the safety rope and rotate with the traction of the safety rope
Braked wheel, a brake component to be braked when power is off to the braked wheel, and to support the fixed braked wheel
With the bracket of brake component.
Further, the brake component includes main body to be fixedly connected with the bracket and is set in the main body simultaneously
Pop-up contacts the contact that friction reduces the braked wheel by revolving speed or stopping with the braked wheel when power is off.
Further, the centrifugal pan includes disk body and the cover board for covering conjunction disk body, further includes being set in the disk body
The central block of the heart and the interior cylindrical type for setting through-hole, one are through the through-hole and generated centrifugal force can be rotated by the disk body
And it the centrifugation part to reciprocatingly slide and is sheathed on described centrifugation part side one end and is fixed on described in the central block other end is fixed on
It is centrifuged the elastic component of part.
Further, described centrifugation part one end is equipped with to make the centrifugation part quickly slide to institute under the influence of centrifugal force
State the exacerbation portion of central block side.
Further, the central block be equipped with one it is flexible to by natural resiliency size control with it is described from
The elastic slice of heart part frictional force size, the elastic slice are fixed on the via top, and the central block bottom is additionally provided with one to logical
Cross the adjusting knob for changing the elastic slice deformation and adjusting elastic slice elasticity size.
Further, the insurance module includes a switch enclosure to control the traction machine electric power disconnection or access
The driving lever of the switch enclosure is controlled by the stirring for centrifugation part with one, the disk body is equipped with one with for the centrifugation
Part stretches out and stirs the opening of the driving lever when the traction sheave is rotated and exceeded the speed limit.
Further, a limit to be limited the centrifugation part extended position is additionally provided on the centrifugation part
Part, the length of the locating part are greater than the width of the opening.
Further, the carriage periphery is equipped with to protect the carriage overall structure stability in automatic brake
Security framework, the security framework top and bottom are equipped with reinforcing rib.
Further, the security framework be equipped with it is multiple to the carriage elastic connection to buffer carriage inertia
Spring.
A kind of emergency staircase of double insurance of the invention, this kind of emergency staircase is using the centrifugal pan mechanically triggered, letter
It is single practical, it is not interfered vulnerable to extraneous factor, it is adjustable, accurate to trigger；By triggering after centrifugal pan directly control insurance module and
Braking system makes the elevator of overspeed obtain double brake, greatly improves the safety coefficient of elevator；Pass through insurance module
Power operation is carried out to traction machine, traction machine not only loses power after power-off, but also the brake on traction machine realizes braking
Movement, makes traction machine reach locking state, to make deceleration of elevator or stopping by hoist ropes；It can be more by braking system
It is good prevent after traction machine power-off brake hoist ropes moment pulling force excessive and caused by phenomenon of rupture, lift car is realized and is pulled
The speed of service of carriage is controlled while protection again.
Detailed description of the invention
Fig. 1 is a kind of emergency staircase structural schematic diagram of double insurance of the embodiment of the present invention；
Fig. 2 is a kind of traction machine top view of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 3 is a kind of braking system attracting state schematic diagram of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 4 is a kind of braking system locking status diagram of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 5 is a kind of non-triggering state schematic diagram of centrifugal pan of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 6 is a kind of centrifugal pan triggering state schematic diagram of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 7 is a kind of disk body schematic diagram of internal structure of the emergency staircase of double insurance of the embodiment of the present invention；
Fig. 8 is a kind of central block side view of the emergency staircase of double insurance of the embodiment of the present invention.
In figure: 1- traction machine, 2- carriage, 3- counterweight, 4- wirerope, 5- driving wheel, 6- centrifugal pan, 61- disk body, 611- are opened
Mouth, 62- cover board, 63- central block, 631- elastic slice, 632- adjusting knob, 633- through-hole, 64- are centrifuged part, 641- exacerbation portion, 642-
Locating part, 65- elastic component, 7- insurance module, 71- driving lever, 72- switch enclosure, 8- braking system, 81- braked wheel, 82- main body,
83- contact, 84- bracket, 9- safety rope.
Specific embodiment
In order to illustrate the embodiments of the present invention more clearly with technical solution in the prior art, Detailed description of the invention will be compareed below
A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, and obtain other embodiments.In addition, it is related to the relative positional relationship only indicated between each component that belongs in orientation, and
It is not absolute positional relation.
Please refer to Fig. 1 and Fig. 2.A kind of emergency staircase of double insurance of the embodiment of the present invention, including hoistway, traction machine 1,
Carriage 2, counterweight 3 and the wirerope 4 to connect carriage 2 and counterweight 3 and be driven by traction machine 1 are set on traction machine 1
Have a brake when power is off braked traction machine 1, traction machine 1 further include to the traction sheave on traction machine 1
Rotate synchronously and obtain the driving wheel 5 of the instant revolving speed of traction sheave, set on 5 one end of driving wheel in traction sheave over speed of rotation
The insurance mould that the centrifugal pan 6 and one triggered by centrifugal force powers off traction machine 1 by the transmission of the centrifugal pan 6 after triggering
Block 7；It further include multiple braking system 8 and one end to control and be respectively arranged on shaft bottom and top by insurance module 7
It is connected to 2 top of carriage and successively winds multiple braking systems 8, the other end connects the safety rope 9 of 2 bottom of carriage.
Please refer to Fig. 3 and Fig. 4.The present invention by the transmission of hoist ropes by being made to set when elevator is run beyond schedule speed
It sets 6 overspeed rotation of centrifugal pan on traction machine 1 and triggers, stir insurance module 7,1 He of traction machine is realized by insurance module 7
The power supply of braking system 8 controls.Insurance module 7 is the logical broken-circuit controller of conventional circuit, when insurance module 7 is access
When, traction machine 1 and braking system 8, which are powered, to be attracted, operate normally, when 7 open circuit of insurance module, traction machine 1 power off it is out of service,
The brake on traction machine 1 powers off locking simultaneously, makes traction sheave stop motion, thus will drive hoist ropes and further control
Carriage 2 makes it slow down or brake；When 7 open circuit of insurance module, braking system 8 is also powered down triggering, then passes through safety rope
9 carry out the braking to carriage 2.
What brake and braking system 8 of the invention was all made of is conventional electromagnetic system moving-coil, when being powered in coil,
Electromagnet magnetizes rapidly the acting of customer service spring and is attracted, and braking maneuver will not occur；When the coil is de-energized, electromagnet cannot achieve electricity
Braking with locked wheels is realized in magnetic induction under the action of the spring.
Braking system 8 to the braked wheel 81, one that winds safety rope 9 and rotated with the traction of safety rope 9 to
The brake component that braked wheel 81 is braked when power-off, and the bracket 84 to support fixed braked wheel 81 and brake component.
Brake component include main body 82 to be fixedly connected with bracket 84 and be set in main body 82 and when power is off pop-up and
The contact friction of braked wheel 81 makes the contact 83 of the reduction revolving speed of braked wheel 81 or stopping.
Please refer to Fig. 5, Fig. 6, Fig. 7 and Fig. 8.Centrifugal pan 6 includes disk body 61 and the cover board 62 for covering conjunction disk body 61, is also wrapped
It includes set on 61 center of disk body and the central block 63 of the interior cylindrical type for setting through-hole 633, consistent reach through hole 633 and can be 61 turns by disk body
The centrifugation part 64 for moving generated centrifugal force and reciprocatingly sliding is fixed on central block 63 separately with centrifugation 64 side one end of part is sheathed on
The elastic component 65 of centrifugation part 64 is fixed in one end.
Centrifugation 64 one end of part is equipped with to make centrifugation part 64 quickly slide to 63 side of central block under the influence of centrifugal force
Exacerbation portion 641.
It is flexible big with centrifugation 64 frictional force of part to be controlled by natural resiliency size that central block 63 is equipped with one
Small elastic slice 631, elastic slice 631 are fixed on 633 top of through-hole, and 63 bottom of central block is additionally provided with one to by changing elastic slice 631
Deformation and the adjusting knob 632 for adjusting the elastic size of elastic slice 631.
Insurance module 7 includes that the switch enclosure 72 and one to control 1 electric power disconnection of traction machine or access passes through centrifugation
Stirring for part 64 and the driving lever 71 of control switch box 72, disk body 61 are equipped with one and are exceeded the speed limit with so that centrifugation part 64 is rotated in traction sheave
When stretch out and stir the opening 611 of driving lever 71.
A locating part 642 to be limited centrifugation 64 extended position of part, locating part 642 are additionally provided on centrifugation part 64
Length be greater than opening 611 width.
The present invention controls the deformation of elastic slice 631 by adjusting the spinning in and out of adjusting knob 632, to adjust elastic slice
The different pressures of 631 pairs of centrifugation parts 64 then change the frictional force of 631 pairs of elastic slice centrifugation parts 64, guarantee that centrifugation part 64 is necessary
The opening 611 that disk body 61 could be stretched out under the action of the centrifugal force that defined revolving speed generates, reaches the length for stirring driving lever 71.
Elastic component 65 of the invention is spring, due to 641 weight of the coefficient of elasticity of spring, the elastic force of elastic slice 631 and exacerbation portion
Amount three codetermines the rotation speed relation of the length and centrifugal pan 6 that are centrifuged the stretching of part 64, so the selection of spring, elastic slice 631
Deformation size and the weight size in exacerbation portion 641 be required to be required to carry out multiple verifying according to elevator running desin speed
And test, guarantee that centrifugation part 64 can not stretch out during elevator normal running speed and stirs driving lever 71；In overspeed from
Heart part 64, which must stretch out, stirs driving lever 71.
Driving wheel 5 of the invention and centrifugal pan 6 are synchronous operation, can integral type welding setting, can also be carried out by bolt
Detachable fixation, in order to centrifugal pan 6 be allow preferably to obtain the instant revolving speed of driving wheel 5.Transmission of the invention
Wheel 5 can synchronize the connection of operation with traction sheave by belt, directly can also successively be twined by wirerope 4 on traction sheave
Around traction sheave and driving wheel 5, in this way, driving wheel 5 can preferably obtain the instant revolving speed of traction sheave, it is not normal in traction system
When, traction sheave overspeed, driving wheel 5 can immediately obtain the rate of hypervelocity, and make the centrifugation part 64 in centrifugal pan 6 in centrifugal force
Under the action of stretched out by the opening 611 of disk body 61, extension continues to rotate with centrifugal pan 6, directly stirs insurance module 7
On control switch box 72 open and close driving lever 71, after driving lever 71 is struck, switch enclosure 72 power off, due to switch enclosure 72 with it is electronic
Machine is installed in tandem, so lead to electric motor circuit breaking, while being triggered brake and braking system 8 is braked, is subtracted elevator
Speed stops, and the brake that the present invention uses is the service brake in elevators field.
2 periphery of carriage is equipped with the security framework to protect 2 overall structure stability of carriage in automatic brake, safe frame
Top of the trellis and bottom are equipped with reinforcing rib.
Security framework is equipped with multiple springs to 2 elastic connection of carriage to buffer 2 inertia of carriage.
Since in automatic brake, the inertia and brake force of whole system are larger, so setting up safe frame on the outside of carriage 2
Frame spring guarantees the personal safety of user preferably to protect and buffer as far as possible.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of emergency staircase of double insurance, including hoistway, traction machine (1), carriage (2), counterweight (3) and to connect
The wirerope (4) stating carriage (2) and counterweight (3) and being driven by the traction machine (1), the traction machine (1) are equipped with
To the brake for when power is off being braked the traction machine (1), it is characterised in that: the traction machine (1) further includes using
The driving wheel (5) of the instant revolving speed of the traction sheave is rotated synchronously and obtained with the traction sheave on the traction machine (1), is set to institute
The centrifugal pan (6) and one to be triggered in the traction sheave over speed of rotation by centrifugal force for stating driving wheel (5) one end lead to
Cross triggering after the centrifugal pan (6) transmission and make the traction machine (1) power off insurance module (7)；It further include multiple use
It is connected with the braking system (8) for being controlled by the insurance module (7) and be respectively arranged on the shaft bottom and top with one end
At the top of the carriage (2) and successively wind multiple braking systems (8), the peace of other end connection carriage (2) bottom
Full rope (9).
2. a kind of emergency staircase of double insurance as described in claim 1, it is characterised in that: the braking system (8) one is used
With wind the safety rope (9) and rotated with the traction of the safety rope (9) braked wheel (81), one to right when power is off
The brake component that the braked wheel (81) is braked, and the bracket to support fixed braked wheel (81) and brake component
(84).
3. a kind of emergency staircase of double insurance as claimed in claim 2, it is characterised in that: the brake component include to
The main body (82) and be set on the main body (82) and pop up and the braked wheel when power is off that the bracket (84) is fixedly connected
(81) contact friction makes the contact (83) of the braked wheel (81) reduction revolving speed or stopping.
4. a kind of emergency staircase of double insurance as described in claim 1, it is characterised in that: the centrifugal pan (6) includes disk
Body (61) and for cover the cover board (62) for closing disk body (61) further includes set on the disk body (61) center and interior setting through-hole (633)
Cylindrical type central block (63), one through the through-hole (633) and can pass through the disk body (61) rotation caused by be centrifuged
It power and the centrifugation part (64) that reciprocatingly slides and is sheathed on described centrifugation part (64) side one end to be fixed on the central block (63) another
The elastic component (65) of centrifugation part (64) is fixed in one end.
5. a kind of emergency staircase of double insurance as claimed in claim 4, it is characterised in that: described centrifugation part (64) one end is set
There is the exacerbation portion to make centrifugation part (64) quickly slide to the central block (63) side under the influence of centrifugal force
(641).
6. a kind of emergency staircase of double insurance as claimed in claim 4, it is characterised in that: the central block (63) is equipped with one
The flexible elastic slice (631) controlled by natural resiliency size with described centrifugation part (64) frictional force size, institute
It states elastic slice (631) to be fixed at the top of the through-hole (633), central block (63) bottom is additionally provided with one to by described in change
Elastic slice (631) deformation and the adjusting knob (632) for adjusting the elastic size of elastic slice (631).
7. a kind of emergency staircase of double insurance as claimed in claim 4, it is characterised in that: the insurance module (7) includes
One switch enclosure (72) and the dialling by centrifugation part (64) to control the traction machine (1) electric power disconnection or access
Driving lever (71) that is dynamic and controlling the switch enclosure (72), the disk body (61) are equipped with one with so that the centrifugation part (64) is in institute
The opening (611) of the driving lever (71) is stretched out and stirred when stating traction sheave rotation hypervelocity.
8. a kind of emergency staircase of double insurance as claimed in claim 7, it is characterised in that: also set on the centrifugation part (64)
There is a locating part (642) to be limited described centrifugation part (64) extended position, the length of the locating part (642) is big
In the width of the opening (611).
9. a kind of emergency staircase of double insurance as described in claim 1, it is characterised in that: carriage (2) periphery is equipped with
To protect the security framework of the carriage (2) overall structure stability, the security framework top and bottom in automatic brake
Portion is equipped with reinforcing rib.
10. a kind of emergency staircase of double insurance as claimed in claim 9, it is characterised in that: the security framework is equipped with more
A spring to the carriage (2) elastic connection to buffer carriage (2) inertia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811344297.8A CN109250601B (en) | 2018-11-13 | 2018-11-13 | Double-insurance safety elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811344297.8A CN109250601B (en) | 2018-11-13 | 2018-11-13 | Double-insurance safety elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109250601A true CN109250601A (en) | 2019-01-22 |
| CN109250601B CN109250601B (en) | 2020-07-03 |
Family
ID=65043722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811344297.8A Active CN109250601B (en) | 2018-11-13 | 2018-11-13 | Double-insurance safety elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109250601B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117661822A (en) * | 2024-02-02 | 2024-03-08 | 新乡学院 | Lifting platform for building construction |
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| JP5079288B2 (en) * | 2006-09-13 | 2012-11-21 | 三菱電機株式会社 | Elevator equipment |
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| CN104876086A (en) * | 2015-05-21 | 2015-09-02 | 梁惠民 | Elevator car sliding prevention system and elevator system |
| CN106081783A (en) * | 2016-08-30 | 2016-11-09 | 常熟市佳能电梯配件有限公司 | A kind of electromagnetic brake preventing accidental movement of elevator cage and braking method |
| CN106966253A (en) * | 2017-05-26 | 2017-07-21 | 升华电梯有限公司 | A kind of elevator emergency brake system |
| CN108584603A (en) * | 2018-07-12 | 2018-09-28 | 湖州德玛吉电梯有限公司 | Elevator overspeed protecting device |
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2018
- 2018-11-13 CN CN201811344297.8A patent/CN109250601B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5079288B2 (en) * | 2006-09-13 | 2012-11-21 | 三菱電機株式会社 | Elevator equipment |
| CN203392664U (en) * | 2013-06-05 | 2014-01-15 | 北京升华电梯有限公司 | Speed governor device for straight-running elevator |
| CN104401836A (en) * | 2014-12-12 | 2015-03-11 | 上海乐天电梯部件有限公司 | Speed limiter for triggering elevator safe execution mechanism or device |
| CN104876086A (en) * | 2015-05-21 | 2015-09-02 | 梁惠民 | Elevator car sliding prevention system and elevator system |
| CN106081783A (en) * | 2016-08-30 | 2016-11-09 | 常熟市佳能电梯配件有限公司 | A kind of electromagnetic brake preventing accidental movement of elevator cage and braking method |
| CN106966253A (en) * | 2017-05-26 | 2017-07-21 | 升华电梯有限公司 | A kind of elevator emergency brake system |
| CN108584603A (en) * | 2018-07-12 | 2018-09-28 | 湖州德玛吉电梯有限公司 | Elevator overspeed protecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117661822A (en) * | 2024-02-02 | 2024-03-08 | 新乡学院 | Lifting platform for building construction |
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| Publication number | Publication date |
|---|---|
| CN109250601B (en) | 2020-07-03 |
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