CN114426235A - Electronic safety gear trigger of elevator - Google Patents
Electronic safety gear trigger of elevator Download PDFInfo
- Publication number
- CN114426235A CN114426235A CN202111654290.8A CN202111654290A CN114426235A CN 114426235 A CN114426235 A CN 114426235A CN 202111654290 A CN202111654290 A CN 202111654290A CN 114426235 A CN114426235 A CN 114426235A
- Authority
- CN
- China
- Prior art keywords
- elastic mechanism
- push rod
- electric push
- electromagnetic chuck
- safety gear
- 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.)
- Granted
Links
- 230000005389 magnetism Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000001960 triggered effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/20—Electric or magnetic using electromagnets
- F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention discloses an electronic safety gear trigger of an elevator, which is characterized in that: the lifting plate of the safety gear is driven by the elastic mechanism, the elastic mechanism is connected with an electromagnetic chuck, the electromagnetic chuck and the elastic mechanism attract each other to keep the elastic mechanism in a reset state, the electromagnetic chuck loses magnetism and is separated from the elastic mechanism when braking, and the elastic mechanism bounces and drives the safety gear to brake; the electromagnetic chuck is provided with an electric push rod, the electric push rod extends out and pushes the electromagnetic chuck to adsorb the elastic mechanism, and then the electric push rod retracts and pulls the elastic mechanism to a reset state. The electronic safety gear trigger does not adopt a speed limiter, a tensioning device, a speed limiter steel wire rope and a safety linkage device, and has the advantages of simple structure, better stability and reliability and capability of reducing the cost.
Description
Technical Field
The invention relates to the technical field of elevator parts, in particular to an electronic safety gear trigger of an elevator.
Background
The pure mechanical structure that present safety tongs's trigger device adopted is a very complicated and relies on a plurality of devices to assemble and form, generally all contains overspeed governor, overspeed device tensioner, overspeed governor wire rope and safety linkage, and this mechanical structure is complicated, and each subassembly still need be reconnected with other subassemblies after the connection of self part to need higher assembly requirement and precision, make structural cost high, and need occupy the more space of well, make with high costs.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electronic safety gear trigger of an elevator, which does not adopt a speed limiter, a tensioning device, a speed limiter steel wire rope and a safety linkage device, has simple structure and better stability and reliability and can reduce the cost.
The technical scheme of the invention is that the invention provides an electronic safety gear trigger of an elevator, which has the following structure that an elastic mechanism is utilized to drive a lifting plate of a safety gear, an electromagnetic chuck is connected on the elastic mechanism, the electromagnetic chuck and the elastic mechanism attract each other to keep the elastic mechanism in a reset state, the electromagnetic chuck loses magnetism and is separated from the elastic mechanism when braking, and the elastic mechanism bounces and drives the safety gear to brake; the electromagnetic chuck is provided with an electric push rod, the electric push rod extends out and pushes the electromagnetic chuck to adsorb the elastic mechanism, and then the electric push rod retracts and pulls the elastic mechanism to a reset state.
In the initial state: the electromagnetic chuck and the elastic mechanism attract each other to enable the elastic mechanism to be compressed and kept in a reset state, and the elastic force of the elastic mechanism enables the lifting plate of the safety tongs to be in the reset state.
During braking: when the elevator is in power failure or the elevator car runs at an overspeed, the electromagnetic chuck loses power, the elastic mechanism triggers, the lifting plate is driven, so that the safety tongs work, at the moment, the safety tongs are in a pre-triggering state, and when the elevator car continues to move downwards, the safety tongs stop the elevator car.
When the electric push rod is reset, if the car is required to move upwards for more than or equal to 50mm in overspeed action, the electric push rod is remotely and manually controlled to reset the elastic mechanism.
The elastic mechanism comprises a pressure spring and a sucker, the pressure spring is in a compressed state in an initial state, and the sucker is attracted with the electrified electromagnetic sucker; when braking, the electromagnetic chuck loses magnetism and then is separated from the chuck, so that the pressure spring is stretched out and drives the lifting plate of the safety gear.
The electric push rod is provided with a travel switch, the electric push rod in a reset state upwards and continuously upwards after being sucked by the sucker, the sucker reaches an upper limit moving position and then reversely pushes the whole electric push rod to reversely move so as to trigger the travel switch, the electric push rod drives the sucker to reset, and the electric push rod and the sucker upwards reset to an initial state under the action of a pressure spring at the bottom of the electric push rod.
After adopting the structure, the invention has the following advantages:
1. the electromagnetic chuck and the chuck are attracted and separated to reset and brake the safety tongs, so that the safety tongs are good in stability and simple in structure.
2. The whole trigger can be triggered and reset by adopting the electromagnetic chuck with lower power, so that the cost is reduced.
3. The electronic safety tongs replace structures including a speed limiter, a tensioning device, a speed limiter steel wire rope, a safety linkage device and the like, so that the installation efficiency of the elevator is improved, the cost is reduced, and the installation space required by the whole device is greatly reduced.
Drawings
Fig. 1 presents an exploded view of the electronic safety gear trigger of the elevator of the invention.
Fig. 2 is a perspective view of the normal state of the trigger of the electronic safety gear of the elevator of the present invention.
Fig. 3 is a front view of the triggered state of the trigger of the electronic safety gear of the elevator of the invention. .
Fig. 4 is a schematic view of the connection between the lifting rod and the top rod of the present invention.
Shown in the figure: 1. the device comprises a fixed seat, 2, an electromagnetic chuck, 3, a chuck, 4, a mandril, 5, a first support, 6, a first pressure spring, 7, a limiting block, 8, an electric push rod, 9, a second support, 10, a second pressure spring, 11, a travel switch, 12, a safety circuit switch, 13, a lifting rod, 14 and a driving plate.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-4, the electronic safety gear trigger for an elevator of the present invention utilizes an elastic mechanism to drive a lifting plate of a safety gear, the elastic mechanism is connected with an electromagnetic chuck, the electromagnetic chuck and the elastic mechanism attract each other to keep the elastic mechanism in a reset state in a normal working state, and the elastic force of the elastic mechanism is utilized to keep the safety gear in a normal state; when braking, the electromagnetic chuck loses magnetism and is separated from the elastic mechanism, and the elastic mechanism bounces and drives the safety gear to brake.
The elastic mechanism comprises a pressure spring and a sucker, the pressure spring is in a compressed state in an initial state, and the sucker is attracted with the electrified electromagnetic sucker; when braking, the electromagnetic chuck loses magnetism and then is separated from the chuck, so that the pressure spring is stretched out and drives the lifting plate of the safety gear.
The trigger of the electronic safety gear has three working states, which are respectively as follows: normal operating state, braking state and reset state.
In a normal working state: as shown in fig. 2, the electromagnetic chuck attracts the elastic mechanism to keep the elastic mechanism in a reset state, at this time, the elastic mechanism is elastically deformed, and the elastic force of the elastic mechanism makes the pulling plate of the safety gear in a reset state.
During braking: as shown in fig. 3, when the elevator is in power failure or the elevator car runs at an overspeed, the electromagnetic chuck loses power, the elastic mechanism is triggered to drive the lifting plate to work the safety gear, the safety gear is in a pre-triggering state at the moment, and the car continues to move downwards, so that the safety gear stops the elevator car.
When the electromagnetic chuck is reset, the power is supplied after the power failure state, the electromagnetic chuck needs to be reset, an electric push rod is arranged on the electromagnetic chuck during resetting, the electric push rod stretches out and pushes the electromagnetic chuck to be attracted with the elastic mechanism, and then the electric push rod retracts and pulls the elastic mechanism to reset to be in a compression state. If the car does overspeed, the car needs to be started to move upwards by more than or equal to 50mm, and then the electric push rod reset elastic mechanism is remotely controlled.
The electric push rod is provided with a travel switch, the electric push rod in a reset state upwards and continuously upwards after being sucked by the sucker, the sucker reaches an upper limit moving position and then reversely pushes the whole electric push rod to reversely move so as to trigger the travel switch, the electric push rod drives the sucker to reset, and the electric push rod and the sucker upwards reset to an initial state under the action of a pressure spring at the bottom of the electric push rod.
Example 1: the invention relates to an electronic safety gear trigger of an elevator, which comprises a fixed seat 1, an electromagnetic chuck 2, a chuck 3, a mandril 4, a first bracket 5 and a second bracket 9. The support 5 is fixed on the fixed seat 1, one end of the ejector rod 4 penetrates through the bent top plate of the first support 5 to be fixed with the sucker 3, and the other end of the ejector rod is connected with a lifting plate 13 on the electronic safety tongs.
A first pressure spring 6 is sleeved in the middle of the ejector rod 4, one end of the first pressure spring 6 abuts against a top plate of the first support 5, and the other end of the first pressure spring abuts against a limiting block 7 fixed on the ejector rod 4; first pressure spring 6 provides ascending elasticity to ejector pin 4 all the time, is triggering state electromagnet 2 outage and the separation of sucking disc 3 just ejector pin 4 makes progress under the effect of first pressure spring 6, is at the reset state electromagnet 2 circular telegram and upwards inhale mutually with sucking disc 3 and drive sucking disc 3 downwards and reset.
An electric push rod 8 is arranged below the electromagnetic chuck 2, the electric push rod 8 is purchased in a conventional market, a telescopic rod of the electric push rod 8 can linearly extend and retract after being powered on, the telescopic rod of the electric push rod 8 penetrates through the first support 5 to push and pull the electromagnetic chuck 2 to linearly and reciprocally extend and retract, the electric push rod 8 is arranged on the second support 9, the second support 9 is connected with the fixed seat 1 in a sliding mode, and the sliding direction of the second support is consistent with that of the electromagnetic chuck 2; a second pressure spring 10 for providing upward elastic force is arranged below the second support 9.
The electric push rod 8 is provided with a travel switch 11, and the travel switch 11 is arranged on the first bracket 5; the fixing seat 1 is provided with a safety loop switch 12 connected with an elevator control panel, and the limiting block 7 is provided with a driving mechanism for opening or resetting the safety loop switch 12.
Actuating mechanism is including being lever structure's drive plate 14 and first drive wheel, drive plate 14 is curved structure, and the fulcrum is located crooked position and connects on fixing base 1, first drive wheel is installed on stopper 7 and is supported with the lateral wall of the power arm of drive plate 14, the resistance arm of drive plate 14 supports with safety circuit switch 12's drive end, stopper 7 upwards drives first drive wheel and promotes drive plate 14's power arm and rotates along the fulcrum, this moment the resistance arm of drive plate 14 then swings downwards and promotes and trigger safety circuit switch 12.
Ejector pin 4 is connected with carry-up plate 13 on the electronic safety gear through coupling mechanism, coupling mechanism includes second drive plate, connecting axle and limiting plate, the top of ejector pin 4 is connected with the top of second drive plate, the second drive plate is curved structure, the bottom of second drive plate is connected and this tie point all is articulated through the connecting axle with carry-up plate 13, the one end of limiting plate also articulates on the connecting axle, and the other end then rotates and connects at fixing base 1, and the limiting plate is used for injecing the moving direction of connecting axle, uses the center of installing on fixing base 1 on the limiting plate promptly to be circular. The connecting shaft is movably embedded in the arc-shaped hole of the fixed seat 1; the both ends of connecting axle are located the both sides of fixing base 1 respectively, and the one end of limiting plate and lifting plate 13 are all installed on the connecting axle. The push rod 4 drives the second driving plate upwards, and the second driving plate drives the end part of the lifting plate 13 to swing upwards in the arc-shaped hole.
The top of second drive plate is equipped with guide structure, guide structure includes two stoppers and limiting plate, two stoppers are fixed on fixing base 1, and are equipped with the interval between the two, form the passageway that supplies the second drive plate activity to pass, the limiting plate is fixed on two stoppers, the limiting plate links as an organic whole with the trigger shell. The second driving plate is driven by the top end of the ejector rod 4 to move upwards, and the channel can position the moving direction of the second driving plate.
The second support 9 is provided with at least one long hole, the number of the positioning rods on the fixing seat 1 is the same as that of the long holes, each long hole is sleeved on a corresponding positioning rod, and the second support 9 takes all the positioning rods as a linear sliding reference.
The side wall of the first driving wheel is provided with an annular groove, the driving plate 14 is in rolling connection with the bottom surface of the annular groove of the first driving wheel, and the first driving wheel rotates and pushes the driving plate 14 upwards to swing along a fulcrum.
The working principle is as follows:
in a normal state, as shown in fig. 2, the suction cup 3 is attracted to the energized electromagnetic suction cup 2; at the moment, the ejector rod 4 is located at the bottom position, the lifting plate 13 on the electronic safety tongs is also located at the bottom position, and the electronic safety tongs do not trigger braking.
In a triggering state, as shown in fig. 3, the electromagnetic chuck 2 is powered off and separated from the chuck 3, and the first pressure spring 6 is reset to push the limiting block 7 and the ejector rod 4 to drive the lifting rod 13 of the electronic safety gear to move upwards, so that the electronic safety gear brakes; the limiting block 7 drives the first driving wheel upwards and pushes the power arm of the driving plate 14 to rotate along the fulcrum, and at the moment, the resistance arm of the driving plate 14 swings downwards and pushes and triggers the safety loop switch 12.
In a reset state, the electric push rod 8 pushes the electrified electromagnetic chuck 2 and the chuck 3 upwards to attract until the travel switch 11 is triggered, and then pulls the chuck 3, the limiting block 7 and the ejector rod 4 downwards to reset. At the reset state electric putter 8 upwards holds the back with sucking disc 3 and lasts upwards, thereby 3 upper limit positions of sucking disc then reverse thrust whole electric putter 8 and second support 9 trigger travel switch 11 along fixing base 1 is downward, electric putter 8 drives sucking disc 3 and resets downwards, electric putter 3 and electromagnet 2 reset upwards under the effect of second pressure spring 10.
Claims (6)
1. The utility model provides an electron safety tongs trigger of elevator which characterized in that: the lifting plate of the safety gear is driven by the elastic mechanism, the elastic mechanism is connected with an electromagnetic chuck, the electromagnetic chuck and the elastic mechanism attract each other to keep the elastic mechanism in a reset state, the electromagnetic chuck loses magnetism and is separated from the elastic mechanism when braking, and the elastic mechanism bounces and drives the safety gear to brake; the electromagnetic chuck is provided with an electric push rod, the electric push rod extends out and pushes the electromagnetic chuck to adsorb the elastic mechanism, and then the electric push rod retracts and pulls the elastic mechanism to a reset state.
2. An elevator electronic safety gear trigger as defined in claim 1, characterized in that: in the initial state: the electromagnetic chuck and the elastic mechanism attract each other to enable the elastic mechanism to be compressed and kept in a reset state, and the elastic force of the elastic mechanism enables the lifting plate of the safety tongs to be in the reset state.
3. An elevator electronic safety gear trigger according to any of claims 1-2, characterized in that: during braking: when the elevator is in power failure or the elevator car runs at an overspeed, the electromagnetic chuck loses power, the elastic mechanism triggers, the lifting plate is driven, so that the safety tongs work, at the moment, the safety tongs are in a pre-triggering state, and when the elevator car continues to move downwards, the safety tongs stop the elevator car.
4. An elevator electronic safety gear trigger according to any one of claims 1-3, characterized in that: when the electric push rod is reset, if the car is required to move upwards for more than or equal to 50mm in case of overspeed action, the electric push rod is remotely and manually controlled to reset the elastic mechanism.
5. An elevator electronic safety gear trigger according to claim 1 or 2, characterized in that: the elastic mechanism comprises a pressure spring and a sucker, the pressure spring is in a compressed state in an initial state, and the sucker is attracted with the electrified electromagnetic sucker; when braking, the electromagnetic chuck loses magnetism and then is separated from the chuck, so that the pressure spring is stretched out and drives the lifting plate of the safety gear.
6. The electronic safety gear trigger for elevators according to any one of claims 1 to 5, characterized in that: the electric push rod is provided with a travel switch, the electric push rod in a reset state upwards and continuously upwards after being sucked by the sucker, the sucker reaches an upper limit moving position and then reversely pushes the whole electric push rod to reversely move so as to trigger the travel switch, the electric push rod drives the sucker to reset, and the electric push rod and the sucker upwards reset to an initial state under the action of a pressure spring at the bottom of the electric push rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654290.8A CN114426235B (en) | 2021-12-31 | 2021-12-31 | Electronic safety gear trigger for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654290.8A CN114426235B (en) | 2021-12-31 | 2021-12-31 | Electronic safety gear trigger for elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114426235A true CN114426235A (en) | 2022-05-03 |
| CN114426235B CN114426235B (en) | 2024-03-19 |
Family
ID=81311875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111654290.8A Active CN114426235B (en) | 2021-12-31 | 2021-12-31 | Electronic safety gear trigger for elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114426235B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202643033U (en) * | 2012-05-30 | 2013-01-02 | 江门市蒙德电气股份有限公司 | Electronic control elevator car braking device |
| US20170001835A1 (en) * | 2015-06-30 | 2017-01-05 | Otis Elevator Company | Electromagnetic safety trigger |
| CN108033330A (en) * | 2017-12-14 | 2018-05-15 | 广州广日电梯工业有限公司 | The speed monitoring and brake apparatus of a kind of vertical lifting equipment |
| CN110526094A (en) * | 2019-09-26 | 2019-12-03 | 西继迅达（许昌）电梯有限公司 | The counterweight frame of having electronic lifting safety tongs |
| CN110697536A (en) * | 2018-07-09 | 2020-01-17 | 杭州沪宁电梯部件股份有限公司 | Safety brake device |
| CN111731964A (en) * | 2020-07-24 | 2020-10-02 | 刘英辉 | Safety gear lifting device, elevator car and using method of elevator car |
| CN113148803A (en) * | 2021-03-10 | 2021-07-23 | 宁波奥德普电梯部件有限公司 | Electronic safety gear trigger of elevator |
-
2021
- 2021-12-31 CN CN202111654290.8A patent/CN114426235B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202643033U (en) * | 2012-05-30 | 2013-01-02 | 江门市蒙德电气股份有限公司 | Electronic control elevator car braking device |
| US20170001835A1 (en) * | 2015-06-30 | 2017-01-05 | Otis Elevator Company | Electromagnetic safety trigger |
| CN108033330A (en) * | 2017-12-14 | 2018-05-15 | 广州广日电梯工业有限公司 | The speed monitoring and brake apparatus of a kind of vertical lifting equipment |
| CN110697536A (en) * | 2018-07-09 | 2020-01-17 | 杭州沪宁电梯部件股份有限公司 | Safety brake device |
| CN110526094A (en) * | 2019-09-26 | 2019-12-03 | 西继迅达（许昌）电梯有限公司 | The counterweight frame of having electronic lifting safety tongs |
| CN111731964A (en) * | 2020-07-24 | 2020-10-02 | 刘英辉 | Safety gear lifting device, elevator car and using method of elevator car |
| CN113148803A (en) * | 2021-03-10 | 2021-07-23 | 宁波奥德普电梯部件有限公司 | Electronic safety gear trigger of elevator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114426235B (en) | 2024-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3447017B1 (en) | Synchronized electronic safety actuator | |
| US11066274B2 (en) | Electromagnetic safety trigger | |
| US6520299B2 (en) | Disk brake for elevator drive | |
| US20200039789A1 (en) | Electronic safety actuator assembly for elevator system | |
| CN100581971C (en) | Wireless speed limiting system of elevator | |
| CN111332899B (en) | Safety braking device of elevator | |
| CN214828163U (en) | Electronic safety gear trigger of elevator | |
| CN113148803B (en) | Electronic safety gear trigger of elevator | |
| CN211945800U (en) | Safety brake device of elevator | |
| CN107985448B (en) | AGV drive lifting mechanism and AGV dolly | |
| CN1955103A (en) | Brake for towline of elevator | |
| CN113184656B (en) | Elevator safety tongs integral type is carried and is drawn mechanism | |
| CN114426235A (en) | Electronic safety gear trigger of elevator | |
| CN200988715Y (en) | Rope-free speed limiting system for lift | |
| CN1325362C (en) | Rope brake for overspeed upgoing elevator | |
| CN110615380B (en) | Stacker objective table overspeed protection device | |
| CN104370239B (en) | A kind of mechanical brake-releasing gear of machine-roomless lift brake | |
| US11858781B2 (en) | Frictionless electronic safety actuator | |
| CN211310698U (en) | Stacker objective table overspeed protection device | |
| CN209853517U (en) | Elevator safety tongs and elevator | |
| CN109250601B (en) | Double-insurance safety elevator | |
| CN210680976U (en) | Magnetic attraction type wall-climbing robot with anti-falling device | |
| CN115899118A (en) | Manual-automatic integrated brake device and method | |
| CN216785383U (en) | Electronic safety tongs | |
| CN219329667U (en) | Tubular motor brake device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |