CN109019239A - Brake controller of elevator - Google Patents
Brake controller of elevator Download PDFInfo
- Publication number
- CN109019239A CN109019239A CN201710436905.7A CN201710436905A CN109019239A CN 109019239 A CN109019239 A CN 109019239A CN 201710436905 A CN201710436905 A CN 201710436905A CN 109019239 A CN109019239 A CN 109019239A
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- Prior art keywords
- brake
- elevator
- acceleration
- block
- brake controller
- 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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Links
- 230000001133 acceleration Effects 0.000 claims abstract description 47
- 230000000712 assembly Effects 0.000 claims abstract description 30
- 238000000429 assembly Methods 0.000 claims abstract description 30
- 230000004913 activation Effects 0.000 claims abstract description 12
- 230000033001 locomotion Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract description 10
- 230000001960 triggered effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010485 coping Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
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
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
- B66B5/22—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by means of linearly-movable wedges
-
- 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
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
- B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses a kind of brake controller of elevator, comprising: brake assemblies on the elevator car are arranged；Velocity pick-up unit, for detecting elevator car speed；Acceleration sensing unit, for detecting the acceleration of lift car；Control unit controls the brake assemblies according to the preset trigger condition of velocity pick-up unit and acceleration sensing unit, and makes brake assemblies to elevator brake and/or reset by electromagnetic activation power.The present invention can be triggered by speed or be triggered by acceleration, can be timely responded to for the situation of suspension fracture by the way of acceleration triggering.
Description
Technical field
The present invention relates to a kind of lift appliances, and in particular to a kind of brake controller of elevator.
Background technique
Traditional elevator brake control is all made of speed triggering, i.e., ought detect that the speed of lift car is more than to set in advance
Triggering brake controller of elevator movement when fixed threshold value, to carriage retarding braking.This triggering mode reply suspension is disconnected
The response lag when situation split is unfavorable for the safety of passenger and cargo.Such as carriage is stopped in load in stop, suspension is disconnected
It splitting, elevator device is in the hole at this time, it should brake at once, but since traditional elevator brake control can only speed
Degree triggering, the triggering speed of setting has not yet been reached in the speed of carriage at this time, therefore brake controller of elevator will not trigger, carriage
Freely falling body is dropped, until speed reaches triggering speed brake controller of elevator and could trigger braking.Reply is hung
The drawbacks of System Tearing operating condition, traditional speed triggering mode is obvious.
Summary of the invention
The present invention is made in view of above-mentioned practical problem of the existing technology, and the object of the present invention is to provide one kind
Brake controller of elevator, it can be triggered by speed or be triggered by acceleration, by the way of acceleration triggering
It can be timely responded to for the situation of suspension fracture.
To achieve the above object, brake controller of elevator provided by the invention includes: the system of setting on the elevator car
Dynamic component；Velocity pick-up unit, for detecting elevator car speed；Acceleration sensing unit, for detecting adding for lift car
Speed；Control unit controls institute according to the preset trigger condition of velocity pick-up unit and acceleration sensing unit
Brake assemblies are stated, and make brake assemblies to elevator brake and/or reset by electromagnetic activation power.
Preferably, the trigger condition of the acceleration sensing unit are as follows: accelerate when the acceleration of carriage is greater than default triggering
Described control unit control brake assemblies movement when spending, while the default triggering acceleration is greater than the acceleration of the normal start and stop of elevator
Degree.
Preferably, the trigger condition of the velocity pick-up unit are as follows: when the speed of carriage is greater than default triggering speed when institute
State control unit control brake assemblies movement.
Preferably, the velocity pick-up unit includes:
Code band on lift car operating path is set, and each coding that code takes corresponds on carriage operating path only
One position,
Test section on the elevator car is fixedly mounted, the test section is for the coding on readout code band.
Preferably, the brake assemblies include a support member, to support the brake assemblies；One brake block, including
Braking surface and guided surface, the braking surface is to contact or separate cage guide to elevator brake or reset；One bootstrap block, packet
Guiding face and joint face are included, the guiding face is to guide the brake block to contact or separate with cage guide, the joint face
It is fixedly connected with support member；One electromagnetic activation component is made for receiving the electronic signal of described control unit and generating electromagnetism
Firmly control position and the direction of motion of brake block.
Preferably, the brake assemblies further include that an elastic energy storage element is fixedly connected with the brake block, described
Pushing force or tractive force that elastic energy storage element generates brake block are used to control position and the direction of motion of the brake block.
Preferably, the electromagnetic activation component is electromagnetic actuator, and the guided surface and bootstrap block of brake block is arranged in
Guiding face between, the electromagnetic actuator includes movable part and fixed part, and coil, electric current are equipped on movable part and fixed part
Active force is generated between movable part and fixed part by coil flowing.
Preferably, the electromagnetic activation component is electromagnetic actuator, and the guided surface and bootstrap block of brake block is arranged in
Guiding face between, the electromagnetic actuator includes movable part and fixed part, and wherein movable part is equipped with permanent magnet or coil, together
When fixed part on be correspondingly provided with coil or permanent magnet.
Preferably, position code band is set on fixed part, and the code band is position encoded to the overall length progress of fixed part, each
Encode the unique positions on corresponding fixed part；
Code band position detection part, the position letter that the code takes with position detection part reading position code are set on movable part
Breath is to determine position of the movable part relative to fixed part.
Preferably, one group of brake assemblies further include elastomer, and the elastomer is fixedly connected simultaneously with the bootstrap block
Brake block can be made to generate the pressing force to guide rail by bootstrap block.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is brake controller of elevator control schematic diagram of the invention.
Fig. 2 is the non-on-position schematic diagram of brake assemblies of brake controller of elevator of the invention.
Fig. 3 is the brake assemblies on-position schematic diagram of brake controller of elevator of the invention.
Fig. 4 is a mounting means schematic diagram of the acceleration transducer of brake controller of elevator of the invention.
Fig. 5 is a mounting means schematic diagram of the velocity sensor of brake controller of elevator of the invention.
The acceleration triggering and speed triggering that Fig. 6 is brake controller of elevator of the invention are in reply elevator suspension system
Braking effect when fracture compares.
Fig. 7 is a kind of schematic diagram of embodiment of electromagnetic actuator in brake controller of elevator of the invention.
The schematic diagram of electromagnetic actuator another embodiment in the brake controller of elevator of Fig. 8 invention.
Fig. 9 is a kind of detection method signal of embodiment of electromagnetic actuator in brake controller of elevator of the invention
Figure.
Description of symbols in figure:
1 carriage, 10 elevator
1a upper guide member 1b lower guide member
130 suspension
2 guide rails 20 run channel
3 brake controller of elevator, 30 brake assemblies
31 brake block
32 braced frame 32a frame upper plates
33 elastic elements
35 bootstrap blocks
36 elastomers
44 45 yards of fixed part code bands band position detection part
47 acceleration transducer, 48 velocity sensor
48a code band 48b test section
5 transmission units
8 electromagnetic actuators
8a electromagnetic actuator movable part 8b electromagnetic actuator fixed part
81 supporting element 82a~82e coils two
83 iron core, 84 coil one
85 permanent magnet, 86 mounting plate
9 control units
Specific embodiment
Fig. 1 is brake controller of elevator control schematic diagram of the invention.The brake controller of elevator is passed with speed
Sensor 48 and acceleration transducer 47, velocity sensor 48 detect the speed of service of carriage, and acceleration transducer 47 detects carriage
Operation acceleration.Speed signal and acceleration signal pass through transmission unit 5 and are input to control unit 9, and control unit 9 is according to pre-
Whether the velocity and acceleration threshold value first set, control electromagnetic actuator 8 act.
The acceleration rate threshold of triggering is set as atrip, elevator brake control fills when the acceleration of carriage 1 is greater than atrip
3 triggerings braking is set, atrip is greater than the acceleration that elevator normally starts and stops.When suspension 130 is broken, the pendant of carriage 1
Falling acceleration is gravity acceleration g n, and greater than the acceleration activation threshold value atrip of setting, control unit 9 controls electromagnetic actuator 8
Movement, brake controller of elevator 3 triggers braking at once, and carriage 1 is avoided to continue to fall.
The threshold speed of triggering is set as vtrip, control unit 9 controls electromagnetism and makees when the speed of carriage 1 is greater than vtrip
Dynamic device 8 acts, the triggering braking of brake controller of elevator 3.
Fig. 2 is the non-on-position schematic diagram of brake assemblies of brake controller of elevator of the invention.As shown in Fig. 2, electric
Terraced brake control 3 includes brake assemblies 30, and the brake assemblies include brake block 31, and brake block 31 is set to guide rail 2
Side forms one between the braking surface (i.e. close to the front of guide rail 2) and guide surface (back side i.e. far from guide rail 2) of brake block 31
Angle, so that brake block 31 is wedge shaped (i.e. the guide surface of brake block 31 is inclined-plane)；The braking surface of brake block 31 and the side of guide rail 2
Face is parallel, and shape has angle between the guide surface of brake block 31 and the side of guide rail 2.
Bootstrap block 35 is fixedly connected with braced frame 32 by elastomer 36；Braced frame 32 is fixedly connected with carriage 1；Braking
Block 31 is connected by elastic element with braced frame 32；Actuator 8 is used to keep the position of brake block 31 and limits its movement side
To；Elastomer 36 can make brake block 31 generate the pressing force to guide rail 2.
Electromagnetic actuator 8 is made of movable part 8a and fixed part 8b, and 8a is fixedly mounted in the guide surface of brake block 31 (i.e.
The back side far from guide rail 2), 8b is fixedly mounted on the side of close brake block 31 of bootstrap block 35.
The contact surface of bootstrap block 35 and actuator fixed part 8b are inclined-plane, the tilt angle on the inclined-plane and leading for brake block 31
It is matched to face, the braking surface to guarantee brake block 31 is parallel with the side of guide rail 2.
Brake assemblies 30 can be respectively arranged in the two sides of guide rail 2, i.e. each side of guide rail 2 respectively corresponds setting one
Brake block 31；Brake assemblies 30 only can also be set in the side of guide rail 2, i.e. brake block is arranged in one of side of guide rail 2
31。
Brake controller of elevator 3 is additionally provided with the elastic element 33 with 32 Joint of braced frame, one end and support frame
Frame 32 is affixed, and the other end is fixedly connected with brake block 31, the pushing force or traction which generates brake block 31
Power is used to control position and the direction of motion of the brake block 31.
Brake controller of elevator 3 further includes control unit 9, controlled according to elevator car information with electronic signal described in
Brake assemblies；Brake controller of elevator 3 controls brake assemblies 30 by control unit 9, and makes to brake by electromagnetic activation power
Component 30 is to elevator brake, reset and adjustment.
As shown in Fig. 2, the speed of service of carriage 1 is not above threshold value vtrip at this time, the acceleration of carriage 1 is not above
Threshold value atrip.Control unit 9 controls electromagnetic actuator, so that movable part 8a is apart from the upper end fixed part 8b certain distance S1, at this time
There is certain gap between brake block 31 and guide rail 2.
As shown in figure 3, it is more than threshold value that the speed of service of carriage 1, which is more than the acceleration of threshold value vtrip or carriage 1, at this time
atrip.Control unit 9 controls electromagnetic actuator 8 and acts, so that brake block 31 touches frame upper plate 32a.It brake block 31 and leads
Frictional force is generated between rail 2 brakes carriage 1.
Fig. 4 show the position of acceleration transducer 47, and acceleration transducer 47 is arranged in carriage 1, for surveying
Measure the acceleration of carriage 1.
Fig. 5 show a kind of tachometric survey mode, and there is velocity sensor 48 code band 48a, code band 48a to be arranged in elevator car
On the operating path in compartment 1, code corresponds to the unique positions on 1 operating path of carriage with each coding on 48a, and test section 48b is solid
Surely it is mounted in carriage 1, test section 48b can be with readout code with the coding on 48a.It can pass through in lift car operation
48b reads the position of carriage in real time, to obtain the speed of service of carriage 1.
Fig. 6 is that the braking effect of acceleration triggering and speed triggering when coping with elevator suspension system 130 and being broken compares.It is false
If there is a situation where suspension 130 to be broken due to overload when stopping stop load for carriage 1, if triggered using speed,
Carriage 1 is by free falling, until speed reaches triggering speed vtrip, brake apparatus 3 could trigger braking, from start to fall to
The displacement that stop carriage occurs is the area of Fig. 6 intermediate cam shape OBD.If triggered using acceleration, when suspension 130 is disconnected
When splitting, the acceleration moment of falling of carriage 1 reaches free-fall acceleration gn, has exceeded preset acceleration rate threshold at this time
Atrip, brake controller of elevator 3 are braked immediately, and the displacement that carriage 1 occurs in this course is Fig. 6 intermediate cam shape OAC's
Area.Apparent acceleration triggering braking has apparent advantage in this case, particularly, as triggering speed vtrip
When bigger, the advantage of acceleration triggering is particularly evident.
Fig. 7 shows a kind of detection side of embodiment of middle electromagnetic actuator of brake controller of elevator of the invention
Method, actuator 8 are made of movable part 8a and fixed part 8b, and wherein movable part 8a is by iron core 83 and the coil being fixed on iron core 83
One 84 compositions；Fixed part 8b is made of supporting element 81 and two 82a of the coil~82e being fixed on supporting element 81.Two 82a of coil~
When being passed through sinusoidal current in 82e, air-gap field can be generated, when sinusoidal current variation, air-gap field will be along 81 length of support plate
Direction moves linearly, and the coil 1 in movable part 8a is in cutting magnetic line in shifting magnetic field, by induced electromotive force and generates
Electric current, electric current and air gap magnetic field interaction in coil 1 generate electromagnetic force, which will push movable part 8a opposite
It is moved in fixed part 8b.It is transported by changing the electric current in coil 82a~82e so as to control the relatively fixed portion 8b of movable part 8a
Dynamic speed and position.
Fig. 8 shows another scheme of actuator, and the movable member 8a of electromagnetic actuator 8 by mounting plate 86 and is mounted on
Permanent magnet 85 on mounting plate 86 forms；Fixed part 8b is by supporting element 81 and two 82a of the coil~82e being fixed on supporting element 81
Composition.Identical as principle shown in Fig. 5, when the sinusoidal current variation in two 82a of coil~82e, air-gap field will be along support plate
The linear movement of 81 length directions, when passing through electric current in two 82a of coil~82e, air-gap field will be along 81 length direction of support plate
It moves linearly, generates electromagnetic force between the permanent magnet 85 and air-gap field in movable part 8a, which pushes movable part 8a
It is moved relative to fixed part 8b.It is relatively fixed so as to control movable part 8a by changing the electric current in two 82a of coil~82e
The speed of portion's 8b relative motion and position.It is also possible to as shown in figure 9, position code band 44 can be arranged on fixed part 8b,
Code band 44 carries out position encoded, each unique positions encoded on corresponding fixed part 8b, code band position to the overall length of fixed part 8b
Test section 45 is fixedly mounted on movable part 8a, and test section 45 can be with the location information on readout code band 44, so that it is determined that can
Position of the dynamic portion 8a relatively with fixed part 8b.
Claims (10)
1. a kind of brake controller of elevator characterized by comprising
Brake assemblies on the elevator car are set；
Velocity pick-up unit, for detecting elevator car speed；
Acceleration sensing unit, for detecting the acceleration of lift car；
Control unit, according to the control of the preset trigger condition of velocity pick-up unit and acceleration sensing unit
Brake assemblies, and make brake assemblies to elevator brake and/or reset by electromagnetic activation power.
2. brake controller of elevator as described in claim 1, which is characterized in that the triggering item of the acceleration sensing unit
Part are as follows: the described control unit control brake assemblies movement when the acceleration of carriage is greater than default triggering acceleration, and meanwhile it is described
Default triggering acceleration is greater than the acceleration of the normal start and stop of elevator.
3. brake controller of elevator as described in claim 1, which is characterized in that the trigger condition of the velocity pick-up unit
Are as follows: the described control unit control brake assemblies movement when the speed of carriage is greater than default triggering speed.
4. brake controller of elevator as claimed in claim 3, which is characterized in that the velocity pick-up unit includes:
Code band on lift car operating path is set, and each coding that code takes corresponds to unique position on carriage operating path
It sets,
Test section on the elevator car is fixedly mounted, the test section is for the coding on readout code band.
5. the brake controller of elevator as described in one of claim 2-4, which is characterized in that the brake assemblies include,
One support member, to support the brake assemblies；One brake block, including braking surface and guided surface, the braking surface to
Contact or separation cage guide are to elevator brake or reset；One bootstrap block, including guiding face and joint face, the guiding face to
The brake block is guided to contact or separate with cage guide, the joint face is fixedly connected with support member；One electromagnetic activation portion
Part, for receive the electronic signal of described control unit and generate electromagnetic force control brake block position and movement side
To.
6. brake controller of elevator as claimed in claim 5, which is characterized in that the brake assemblies further include an elasticity
Energy-storage travelling wave tube is fixedly connected with the brake block, the pushing force or traction that the elastic energy storage element generates brake block
Power is used to control position and the direction of motion of the brake block.
7. brake controller of elevator as claimed in claim 6, which is characterized in that
The electromagnetic activation component be electromagnetic actuator, be arranged in brake block guided surface and bootstrap block guiding face it
Between, the electromagnetic actuator includes movable part and fixed part, and coil is equipped on movable part and fixed part, and electric current passes through coil stream
It moves and generates active force between movable part and fixed part.
8. brake controller of elevator as claimed in claim 6, which is characterized in that the electromagnetic activation component is electromagnetic activation
Device is arranged between the guided surface of brake block and the guiding face of bootstrap block, and the electromagnetic actuator includes movable part and consolidates
Determine portion, wherein movable part is equipped with permanent magnet or coil, while coil or permanent magnet are correspondingly provided on fixed part.
9. brake controller of elevator as claimed in claim 8, which is characterized in that
Position code band is set on fixed part, and the code band is position encoded to the overall length progress of fixed part, and each coding is corresponding solid
Determine the unique positions in portion；
On movable part be arranged code band position detection part, the code with the location information that position detection part reading position code takes with
Determine the opposite position with fixed part of movable part.
10. brake controller of elevator as claimed in claim 9, which is characterized in that one group of brake assemblies further include bullet
Property body, the elastomer is fixedly connected with the bootstrap block and brake block can be made to generate to the pressing force of guide rail by bootstrap block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710436905.7A CN109019239B (en) | 2017-06-12 | 2017-06-12 | Elevator brake control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710436905.7A CN109019239B (en) | 2017-06-12 | 2017-06-12 | Elevator brake control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109019239A true CN109019239A (en) | 2018-12-18 |
| CN109019239B CN109019239B (en) | 2020-09-22 |
Family
ID=64629920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710436905.7A Active CN109019239B (en) | 2017-06-12 | 2017-06-12 | Elevator brake control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109019239B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084769A (en) * | 2021-12-08 | 2022-02-25 | 陕西省特种设备检验检测研究院 | An elevator load test safety protection device and method |
| AU2020242986B2 (en) * | 2019-03-15 | 2023-07-27 | Inventio Ag | Safety brake device and safety brake method |
| US12280984B2 (en) * | 2018-10-26 | 2025-04-22 | Otis Elevator Company | Elevator system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008303014A (en) * | 2007-06-06 | 2008-12-18 | Mitsubishi Electric Corp | Elevator braking device |
| CN101565145A (en) * | 2009-04-20 | 2009-10-28 | 日立电梯（中国）有限公司 | Novel progressive safety tongs |
| CN102348626A (en) * | 2009-03-16 | 2012-02-08 | 奥的斯电梯公司 | Elevator over-acceleration and over-speed protection system |
| CN104340804A (en) * | 2014-10-30 | 2015-02-11 | 国家电网公司 | Emergency braking device for elevator |
| CN204624883U (en) * | 2015-03-25 | 2015-09-09 | 浙江西直门电梯有限公司 | A kind of novel elevator safety tongs |
| CN106573755A (en) * | 2014-09-09 | 2017-04-19 | 三菱电机株式会社 | Elevator device |
-
2017
- 2017-06-12 CN CN201710436905.7A patent/CN109019239B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008303014A (en) * | 2007-06-06 | 2008-12-18 | Mitsubishi Electric Corp | Elevator braking device |
| CN102348626A (en) * | 2009-03-16 | 2012-02-08 | 奥的斯电梯公司 | Elevator over-acceleration and over-speed protection system |
| CN101565145A (en) * | 2009-04-20 | 2009-10-28 | 日立电梯（中国）有限公司 | Novel progressive safety tongs |
| CN106573755A (en) * | 2014-09-09 | 2017-04-19 | 三菱电机株式会社 | Elevator device |
| CN104340804A (en) * | 2014-10-30 | 2015-02-11 | 国家电网公司 | Emergency braking device for elevator |
| CN204624883U (en) * | 2015-03-25 | 2015-09-09 | 浙江西直门电梯有限公司 | A kind of novel elevator safety tongs |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12280984B2 (en) * | 2018-10-26 | 2025-04-22 | Otis Elevator Company | Elevator system |
| AU2020242986B2 (en) * | 2019-03-15 | 2023-07-27 | Inventio Ag | Safety brake device and safety brake method |
| US11884514B2 (en) | 2019-03-15 | 2024-01-30 | Inventio Ag | Safety brake device and safety brake method |
| CN114084769A (en) * | 2021-12-08 | 2022-02-25 | 陕西省特种设备检验检测研究院 | An elevator load test safety protection device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109019239B (en) | 2020-09-22 |
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