CN114955778A - Emergency braking device for elevator safety - Google Patents
Emergency braking device for elevator safety Download PDFInfo
- Publication number
- CN114955778A CN114955778A CN202210780763.7A CN202210780763A CN114955778A CN 114955778 A CN114955778 A CN 114955778A CN 202210780763 A CN202210780763 A CN 202210780763A CN 114955778 A CN114955778 A CN 114955778A
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- Prior art keywords
- detection
- elevator
- photoelectric switch
- emergency braking
- elevator safety
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- 238000001514 detection method Methods 0.000 claims abstract description 78
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 2
- 230000005693 optoelectronics Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention discloses an emergency braking device for elevator safety, which comprises: the traction motor passes through frame and workstation fixed connection, and traction motor passes through the reducing gear box and tows a set transmission setting, tows the surface of dish simultaneously and has seted up the inspection hole to install detection device on the workstation, the control box is installed to the bottom of workstation, and the internally mounted of control box has uninterrupted power source, and the contactor is installed to uninterrupted power source's the upper left side simultaneously, and the relay is installed to uninterrupted power source's the upper right side. According to the emergency braking device for elevator safety, under the condition that an elevator runs abnormally, the photoelectric switch suddenly detects that the running speed of the traction disc exceeds 110% of the normal running speed of the elevator, the detection plate immediately controls the relay to stop outputting, the contactor loses power, the braking loop of the traction machine brake is disconnected, the brake acts, the elevator is immediately braked and stopped, and passengers in the elevator are protected.
Description
Technical Field
The invention relates to the field of elevators, in particular to an emergency braking device for elevator safety.
Background
In the conventional elevator technology, the braking device includes three kinds, which are respectively: speed limiter braking, rope clamping device braking and brake braking; the overspeed governor is used for monitoring and controlling overspeed of the car at any time, and when the running speed of the car exceeds a rated speed by a certain value, the overspeed governor is linked with the safety tongs to stop the car; the rope clamping device directly applies braking force to the traction steel wire rope, and the elevator car is stopped through friction force between the rope clamping device and the steel wire rope.
The elevator runaway refers to that when an elevator runs, the elevator car runs uncontrollably due to the fact that the program of a main control board of the elevator or the program control of a frequency converter is disordered or the signal pulse of an encoder controlled by a host vector closed loop is wrong or has no pulse, the operation of a traction host is suddenly uncontrolled, and the impulsive high-speed rotation occurs, so that the elevator car runs uncontrollably, and a brake is braked in time due to the fact that the control program fails and the power supply is not controlled to be disconnected in time; causing safety accidents of top rushing or bottom squating.
Disclosure of Invention
The invention provides an emergency braking device for elevator safety in order to make up for market vacancy.
The present invention is directed to an emergency braking device for elevator safety to solve the above problems of the related art.
In order to achieve the purpose, the invention provides the following technical scheme:
an emergency braking method for elevator safety comprises the following steps: the method comprises the following steps of drilling a traction sheave, installing a detection switch and detecting the speed of the detection switch:
step A, opening a hole in a traction sheave: a detection hole, namely 4 holes, is formed on the same circumference of the traction disc at every 90 degrees; the circumferential distances of the magnets or the magnetic isolation plates are the same;
b, installing a detection switch: installing 1 detection switch; the detection switch is a photoelectric switch and is aligned to the position of the detection hole, and because the hole distances are the same, the time for the host to operate the signals induced by the detection switch is the same or similar;
c, detecting the speed of the detection switch: under the normal condition of the elevator, the relay of the circuit board outputs, the contactor is closed, and the normally open point is closed; at the moment, the detection function does not influence the normal control brake operation of the elevator; when the elevator drops at the top speed, the photoelectric switch suddenly detects that the running speed exceeds 110% of the normal running speed of the elevator, the detection board immediately controls the relay to stop outputting, the contactor loses power, the brake loop of the tractor brake is disconnected, the brake acts, and the elevator is immediately stopped.
An emergency brake device for elevator safety, comprising:
the traction motor is fixedly connected with the workbench through the base and is in transmission arrangement with the traction disc through the reduction box, meanwhile, the surface of the traction disc is provided with a detection hole, the workbench is provided with a detection device, the bottom of the workbench is provided with a control box, the control box is internally provided with an uninterruptible power supply, the upper left side of the uninterruptible power supply is provided with a contactor, and the upper right side of the uninterruptible power supply is provided with a relay;
the photoelectric switch on the detection device is installed on the fixed plate, the bottom of the fixed plate is welded on the surface of the workbench, and meanwhile, a mounting hole is formed in the fixed plate.
Furthermore, both sides of the workbench are reinforced by fixing plates, and the fixing plates are of U-shaped cross section structures made of metal materials.
Furthermore, supporting legs are respectively welded and fixed on two sides of the bottom of the fixing plate, the supporting legs are of a T-shaped structure made of metal materials, the traction disc is movably mounted on the fixing seat, and the bottom of the fixing seat is mounted on the upper side surface of the fixing plate through bolts.
Furthermore, detection device includes photoelectric switch, nut, connecting wire, fixed plate and mounting hole, and photoelectric switch and inspection hole set up relatively.
Furthermore, the photoelectric switch is electrically connected with the uninterruptible power supply, the type of the photoelectric switch is E3F-DS30C4, the output current of the photoelectric switch is 300mA, the response time of the photoelectric switch is less than 2ms, and the working voltage of the photoelectric switch is DC 6V-36V.
Furthermore, a threaded sleeve is installed on the outer side of the photoelectric switch, nuts are arranged on two sides of the threaded sleeve, and the photoelectric switch is installed and fixed in the installation hole through the two sets of nuts.
Furthermore, the internally mounted of control box has detection circuit board, and photoelectric switch installs connecting wire in the tip, and photoelectric switch passes through connecting wire and detection circuit board electric connection simultaneously to detection circuit board and relay electric connection.
Furthermore, the relay is in telecommunication connection with the contactor, the relay and the contactor supply power through an uninterruptible power supply, and meanwhile, the contactor is electrically connected with a brake inside the traction motor.
An emergency braking device for elevator safety is used by an emergency braking method for elevator safety.
Compared with the prior art, the invention has the beneficial effects that: under the condition that the elevator is in abnormal operation, the photoelectric switch suddenly detects that the operation speed of the traction disc exceeds 110% of the normal operation speed of the elevator, the detection plate immediately controls the relay to stop outputting, the contactor loses power, the brake loop of the traction machine brake is disconnected, the brake acts, the elevator is immediately stopped, and passengers in the elevator are protected.
Drawings
FIG. 1 is a schematic front view of the structure of the present invention;
FIG. 2 is a side view of the structure of the present invention of FIG. 1;
FIG. 3 is a schematic view of a detecting device according to the present invention;
FIG. 4 is a schematic circuit diagram of the emergency braking device of the present invention;
fig. 5 is a logic operation block diagram of the emergency braking device of the present invention.
In the figure: 1. a traction motor; 2. a traction disc; 3. a detection hole; 4. a reinforcing plate; 5. supporting legs; 6. a control box; 7. a contactor; 8. a relay; 9. an uninterruptible power supply; 10. a work table; 11. a detection device; 111. a photoelectric switch; 112. a nut; 113. connecting a lead; 114. a fixing plate; 115. and (7) installing holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: an emergency braking method for elevator safety comprises the following steps: the method comprises the following steps of drilling a traction sheave, installing a detection switch and detecting the speed of the detection switch:
step A, opening a hole in a traction sheave: a detection hole 3, namely 4 holes, is formed on the same circumference of the traction disc 2 at every 90 degrees; the circumferential distances of the magnets or the magnetic isolation plates are the same;
b, installing a detection switch: installing 1 detection switch; the detection switch is a photoelectric switch 111 and is aligned to the position of the detection hole 3, and the time for the host to operate the signal induced by the detection switch is the same or similar because the hole distances are the same;
c, detecting the speed of the detection switch: under the normal condition of the elevator, the relay 8 of the circuit board outputs, the contactor 7 is closed in an attraction mode, and a normally open point is closed; at the moment, the detection function does not influence the normal control brake operation of the elevator; when the elevator drops at the top speed, the photoelectric switch 111 suddenly detects that the running speed exceeds 110% of the normal running speed of the elevator, the detection plate immediately controls the relay 8 to stop outputting, the contactor 7 loses power, the brake loop of the tractor brake is disconnected, the brake acts, and the elevator is immediately stopped.
The second embodiment is as follows: referring to fig. 1 to 5, an emergency braking apparatus for elevator safety includes: a traction motor 1 and a detection device 11;
the traction motor 1 is fixedly connected with a workbench 10 through a base, the traction motor 1 is in transmission arrangement with a traction disc 2 through a reduction gearbox, meanwhile, a detection hole 3 is formed in the surface of the traction disc 2, a detection device 11 is installed on the workbench 10, a control box 6 is installed at the bottom of the workbench 10, an uninterruptible power supply 9 is installed inside the control box 6, meanwhile, a contactor 7 is installed on the upper left side of the uninterruptible power supply 9, and a relay 8 is installed on the upper right side of the uninterruptible power supply 9;
the photoelectric switch 111 of the detection device 11 is mounted on the fixing plate 114, and the bottom of the fixing plate 114 is welded on the surface of the worktable 10, and the fixing plate 114 is internally provided with a mounting hole 115.
The working principle is as follows: the photoelectric switch 111 and the detection holes 3 are oppositely arranged, the detection holes 3 rotate under the action of the traction disc 2, four groups of detection holes 3 are uniformly formed, the distance between every two adjacent groups of detection holes 3 is constant, and the time for the host to operate the signals induced by the photoelectric switch 111 is the same or similar; the normal operation time of the detection signal of the corresponding photoelectric switch 111 is set according to the rated speed of the elevator.
When the elevator is in operation, if the photoelectric switch 111 suddenly detects that the operation speed exceeds 110% of the normal operation speed of the elevator, the detection board immediately controls the relay 8 to stop outputting, the contactor 7 loses power, the brake loop of the brake of the traction motor 1 is disconnected, the brake acts, the elevator is stopped immediately, and the safety of the elevator in working hours is improved.
The third concrete implementation mode: in this embodiment, as a further limitation of the second embodiment, both sides of the table 10 are reinforced by the reinforcing plates 4, and the reinforcing plates 4 are made of a metal material and have a U-shaped cross section.
As shown in fig. 1-3: the traction disc 2 on the elevator traction main machine is circular, and the diameter of the traction disc 2 is 300-700 mm; on the same circumference of the traction disc 2, every 90 ° there is a hole, i.e. 4 holes, with the same circumferential distance.
The fourth concrete implementation mode: in the third embodiment, the supporting legs 5 are respectively welded and fixed to two sides of the bottom of the reinforcing plate 4, the supporting legs 5 are made of metal and have a T-shaped cross section, the traction disc 2 is movably mounted on the fixing base, and the bottom of the fixing base is mounted on the upper side surface of the reinforcing plate 4 through bolts.
As shown in fig. 1-2: the traction motor 1 and the traction disc 2 are installed on the workbench 10, two sides of the workbench 10 are fixed through the reinforcing plate 4, and two sides of the workbench 10 are supported through the supporting legs 5 installed at the bottom of the reinforcing plate 4.
The fifth concrete implementation mode: in this embodiment, the second embodiment is further limited, the detecting device 11 includes a photoelectric switch 111, a nut 112, a connecting wire 113, a fixing plate 114, and a mounting hole 115, and the photoelectric switch 111 is disposed opposite to the detecting hole 3.
As shown in fig. 1-3: 1 photoelectric switch 111 is installed and is aligned to the position of the detection hole 3, and the time for the host to operate the signal sensed by the detection switch is the same or similar because the hole distance between the detection hole 3 and the detection hole 3 is the same.
The sixth specific implementation mode: in a further limitation of the fifth embodiment, the optoelectronic switch 111 is electrically connected to the uninterruptible power supply 9, the model of the optoelectronic switch 111 is E3F-DS30C4, the output current of the optoelectronic switch 111 is 300mA, the response time of the optoelectronic switch 111 is less than 2ms, and the operating voltage of the optoelectronic switch 111 is DC 6V-36V.
As shown in fig. 3-4: the detection signal end of the photoelectric switch 111 is connected to a circuit board, the circuit board has an input signal point, is controlled by an output relay 8 and has the function of setting the speed parameter of the detection signal; 1 contactor 7 is used, and a normally open point is selected to be connected in series to a brake loop of a brake of the traction motor 1.
The seventh embodiment: in this embodiment, a threaded sleeve is installed outside the optoelectronic switch 111, and nuts 112 are disposed on both sides of the threaded sleeve, and the optoelectronic switch 111 is installed and fixed inside the installation hole 115 through two sets of nuts 112.
As shown in fig. 1-3: the photoelectric switch 111 is mounted in the following manner: the photoelectric switch 111 is inserted into the mounting hole 115, and the photoelectric switch 111 is fixedly mounted on the fixing plate 114 by two sets of nuts 112.
The specific implementation mode is eight: in this embodiment, a detection circuit board is installed inside the control box 6, a connection lead 113 is installed at an end of the photoelectric switch 111, the photoelectric switch 111 is electrically connected to the detection circuit board through the connection lead 113, and the detection circuit board is electrically connected to the relay 8.
As shown in fig. 3-5: under the condition that the elevator normally runs, the relay 8 of the circuit board outputs, the contactor 7 is closed in an attraction mode, and a normally open point is closed; at the moment, the detection function does not influence the normal control of the elevator, and the brake operates; and the detection signal circuit board is used for setting the normal running time of the detection signal corresponding to the photoelectric switch 111 according to the rated speed of the elevator.
The specific implementation method nine: in the eighth embodiment, the relay 8 is in telecommunication connection with the contactor 7, the relay 8 and the contactor 7 are powered by the uninterruptible power supply 9, and the contactor 7 is electrically connected with the brake inside the traction motor 1.
As shown in fig. 3-5: when the elevator is in abnormal operation, the photoelectric switch 111 suddenly detects that the operation speed of the traction disc 2 exceeds 110% of the normal operation speed of the elevator, the detection plate immediately controls the relay 8 to stop outputting, the contactor 7 loses power, the brake loop of the traction machine brake is disconnected, the brake operates, the elevator is immediately stopped, and passengers in the elevator are protected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An emergency braking method for elevator safety comprises the following steps: the driving sheave trompil, installation detection switch and detection switch carry out speed detection, its characterized in that:
step A, opening a hole in a traction sheave: a detection hole (3), namely 4 holes, is formed on the same circumference of the traction disc (2) every 90 degrees; the circumferential distances of the magnets or the magnetic isolation plates are the same;
b, installing a detection switch: installing 1 detection switch; the detection switch is a photoelectric switch (111) and is aligned to the position of the detection hole (3), and because the hole distances are the same, the time for operating the detection switch to sense signals by the host is the same or similar;
c, detecting the speed of the detection switch: under the normal condition of the elevator, a relay (8) of the circuit board outputs, a contactor (7) is closed in an attraction mode, and a normally open point is closed; at the moment, the detection function does not influence the normal control brake operation of the elevator; when the elevator drops at the highest speed, the photoelectric switch (111) suddenly detects that the running speed exceeds 110% of the normal running speed of the elevator, the detection plate immediately controls the relay (8) to stop outputting, the contactor (7) loses power, the braking loop of the tractor brake is disconnected, the brake acts, and the elevator is immediately stopped.
2. An emergency braking device for elevator safety, comprising:
the traction motor (1) is fixedly connected with a workbench (10) through a base, the traction motor (1) is in transmission arrangement with a traction disc (2) through a reduction gearbox, meanwhile, a detection hole (3) is formed in the surface of the traction disc (2), a detection device (11) is installed on the workbench (10), a control box (6) is installed at the bottom of the workbench (10), an uninterruptible power supply (9) is installed inside the control box (6), a contactor (7) is installed on the upper left side of the uninterruptible power supply (9), and a relay (8) is installed on the upper right side of the uninterruptible power supply (9);
the detection device (11), photoelectric switch (111) on detection device (11) is installed on fixed plate (114), and fixed plate (114) bottom welds the surface at workstation (10), and fixed plate (114) inside has seted up mounting hole (115) simultaneously.
3. The emergency braking device for elevator safety according to claim 2, wherein: both sides of the workbench (10) are reinforced by reinforcing plates (4), and the reinforcing plates (4) are of U-shaped cross sections made of metal materials.
4. The emergency braking device for elevator safety according to claim 3, wherein: supporting legs (5) are respectively welded and fixed on two sides of the bottom of the reinforcing plate (4), the supporting legs (5) are of a T-shaped structure with a section made of metal materials, meanwhile, the traction disc (2) is movably mounted on the fixed seat, and the bottom of the fixed seat is mounted on the upper side surface of the reinforcing plate (4) through bolts.
5. The emergency braking device for elevator safety according to claim 2, wherein: the detection device (11) comprises a photoelectric switch (111), a nut (112), a connecting wire (113), a fixing plate (114) and a mounting hole (115), and the photoelectric switch (111) and the detection hole (3) are arranged oppositely.
6. The emergency braking device for elevator safety according to claim 5, wherein: the photoelectric switch (111) is electrically connected with the uninterruptible power supply (9), the model of the photoelectric switch (111) is E3F-DS30C4, the output current of the photoelectric switch (111) is 300mA, the response time of the photoelectric switch (111) is less than 2ms, and the working voltage of the photoelectric switch (111) is DC 6V-36V.
7. The emergency braking device for elevator safety according to claim 5, wherein: the outer side of the photoelectric switch (111) is provided with a threaded sleeve, two sides of the threaded sleeve are provided with nuts (112), and the photoelectric switch (111) is installed and fixed in the installation hole (115) through two groups of nuts (112).
8. The emergency braking device for elevator safety according to claim 2, wherein: the inside mounting of control box (6) has the detection circuit board, and photoelectric switch (111) tip installs connecting wire (113), and photoelectric switch (111) pass through connecting wire (113) and detection circuit board electric connection simultaneously to detection circuit board and relay (8) electric connection.
9. The emergency braking device for elevator safety according to claim 8, wherein: the relay (8) is in telecommunication connection with the contactor (7), the relay (8) and the contactor (7) supply power through the uninterruptible power supply (9), and meanwhile the contactor (7) is electrically connected with a brake inside the traction motor (1).
10. An emergency braking device for elevator safety is used by an emergency braking method for elevator safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210780763.7A CN114955778A (en) | 2022-07-04 | 2022-07-04 | Emergency braking device for elevator safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210780763.7A CN114955778A (en) | 2022-07-04 | 2022-07-04 | Emergency braking device for elevator safety |
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| Publication Number | Publication Date |
|---|---|
| CN114955778A true CN114955778A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210780763.7A Pending CN114955778A (en) | 2022-07-04 | 2022-07-04 | Emergency braking device for elevator safety |
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| Country | Link |
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| CN (1) | CN114955778A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1298084A2 (en) * | 2001-09-28 | 2003-04-02 | Kabushiki Kaisha Meidensha | Hoisting machine for elevator |
| CN2823214Y (en) * | 2005-03-20 | 2006-10-04 | 胡祥勤 | Load-limiting speed-limiting rope-loosing protector for lifting machinery |
| CN1993289A (en) * | 2005-04-20 | 2007-07-04 | 三菱电机株式会社 | Traction device for elevator |
| CN102976175A (en) * | 2012-11-30 | 2013-03-20 | 江南嘉捷电梯股份有限公司 | Elevator speed measuring device |
| EP3805139A1 (en) * | 2019-10-10 | 2021-04-14 | Aufzugswerke Schmitt & Sohn GmbH & Co. KG | Control device and method for engaging an arresting device |
| KR20210084924A (en) * | 2019-12-30 | 2021-07-08 | 현대엘리베이터주식회사 | Apparatus for governor trip of temporary elevator car |
-
2022
- 2022-07-04 CN CN202210780763.7A patent/CN114955778A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1298084A2 (en) * | 2001-09-28 | 2003-04-02 | Kabushiki Kaisha Meidensha | Hoisting machine for elevator |
| CN2823214Y (en) * | 2005-03-20 | 2006-10-04 | 胡祥勤 | Load-limiting speed-limiting rope-loosing protector for lifting machinery |
| CN1993289A (en) * | 2005-04-20 | 2007-07-04 | 三菱电机株式会社 | Traction device for elevator |
| CN102976175A (en) * | 2012-11-30 | 2013-03-20 | 江南嘉捷电梯股份有限公司 | Elevator speed measuring device |
| EP3805139A1 (en) * | 2019-10-10 | 2021-04-14 | Aufzugswerke Schmitt & Sohn GmbH & Co. KG | Control device and method for engaging an arresting device |
| KR20210084924A (en) * | 2019-12-30 | 2021-07-08 | 현대엘리베이터주식회사 | Apparatus for governor trip of temporary elevator car |
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Application publication date: 20220830 |
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