CN211169390U - Lifting device for guaranteeing elevator safety - Google Patents
Lifting device for guaranteeing elevator safety Download PDFInfo
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- CN211169390U CN211169390U CN201921775336.XU CN201921775336U CN211169390U CN 211169390 U CN211169390 U CN 211169390U CN 201921775336 U CN201921775336 U CN 201921775336U CN 211169390 U CN211169390 U CN 211169390U
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Abstract
The utility model provides a hoisting device for guaranteeing the safety of an elevator, which comprises a car, a car guide rail, a first driving assembly, a second driving assembly, a rotating shaft, a grooved wheel, a traction steel rope, an emergency button, a speed detector, a speed limiting part and a control part, wherein two ends of the rotating shaft are respectively driven by the first driving assembly and the second driving assembly; the rotating shaft penetrates through the center of the sheave and is fixed with the sheave in the middle, one end of the traction steel rope is fixed with the top of the lift car, the other end of the traction steel rope is fixed with a counterweight system of the elevator, and the middle part of the traction steel rope is wound on the sheave; a rotating shaft key groove is formed in the position, penetrating through a second driven gear of the second driving assembly, of the rotating shaft, a driven gear key groove is formed in the corresponding position of the second driven gear, and a first electromagnet and a key are installed at the bottom of the rotating shaft key groove. The utility model discloses when the elevator meets under emergency, can prevent fast that the elevator from rising or falling to the normal work of quick recovery elevator is showing the security that has improved the elevator.
Description
Technical Field
The utility model belongs to the technical field of the elevator, specifically say, relate to a hoisting device of guarantee elevator safety.
Background
With the development of economy and the centralization of urban population, high-rise buildings in cities increase year by year, and the use of vertical lifting elevators becomes more extensive. Once a vertical lift elevator breaks down, the vertical lift elevator is in danger of rapidly rising or falling, so that not only can serious life threat be generated to passengers in the elevator, but also huge psychological burden can be generated, and the safety of the vertical lift elevator becomes a focus of increasing attention of people.
In order to improve the safety of a vertical lift elevator, in the prior art, the vertical lift elevator is equipped with a necessary elevator falling prevention device. The most common elevator fall protection devices currently used include a speed governor, a safety gear, and a buffer (e.g., a buffer spring) at the bottom end of a hoistway. When the running speed of the elevator reaches or exceeds a set limit value, the speed limiter stops running, a connecting rod mechanism arranged on a car beam is lifted up by means of friction force in a rope pulley or a rope clamping mechanism, a signal is sent out through mechanical action, and a control circuit is cut off. Meanwhile, the safety gear is forced to act, so that the lift car is forcibly stopped on the lift car guide rail, the safety gear can be released only when all the safety switches are reset and the lift car is lifted upwards, and the elevator cannot be used when the safety gear is not restored to a normal state.
However, the safety performance of the existing elevator still needs to be improved, and after the elevator is forcibly braked by the speed limiter and the safety tongs, the operation cannot be rapidly recovered, so that the elevator is possibly stopped between the upper floor and the lower floor, people cannot rapidly leave the elevator car, and the fear of people is continuously increased.
Therefore, there is a need to design a more safe elevator hoisting device to overcome the above technical problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a guarantee elevator safety's hoisting device to overcome the above-mentioned technical problem among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a guarantee elevator safety's hoisting device, includes car, car guide rail, first drive assembly, second drive assembly, pivot, sheave, traction cable, emergency button, speed detector, speed limit part and control division, wherein:
the car can move up and down along the car guide rail, and the emergency button is arranged in the car; the first driving assembly comprises a first driving motor, a first driving gear driven by the first driving motor and a first driven gear driven by the first driving gear; the second driving assembly comprises a second driving motor, a second driving gear driven by the second driving motor and a second driven gear driven by the second driving gear; the first driven gear is fixedly arranged at one end of the rotating shaft, the second driven gear is arranged at the other end of the rotating shaft, and the rotating shaft is driven by the first driven gear or the second driven gear;
the rotating shaft penetrates through the center of the sheave and is fixedly connected with the sheave in the middle, one end of the traction steel rope is fixedly connected with the top of the car, the other end of the traction steel rope is fixedly connected with a counterweight system of the elevator, and the middle part of the traction steel rope is wound on the sheave; a rotating shaft key groove is formed in the position, penetrating through the second driven gear, of the rotating shaft, a corresponding driven gear key groove is formed in the corresponding position of the second driven gear, and a first electromagnet and a key are installed at the bottom of the rotating shaft key groove; when the power is on, the key is attracted in the key groove of the rotating shaft by the first electromagnet;
the first driving motor, the second driving motor, the emergency button and the speed detector are all connected with the control part in a communication mode, and the electrification and the outage of the first electromagnet are controlled by the control part; the speed limiting component is used for limiting the rotation of the rotating shaft when the elevator is out of control and falls to a preset maximum speed value.
When the emergency button is pressed down, the control part controls the first electromagnet to be powered off, the upper end of the key is thrown into the driven gear key groove, and the lower end of the key is left in the rotating shaft key groove, so that the rotating shaft is driven to rotate by the rotation of the second driven gear, and the lift car is lifted upwards or descended downwards; when the emergency button is not pressed down, the speed detector detects that the lifting or descending speed of the lift car reaches a preset maximum speed value, the control part controls the speed limiting component to clamp the rotating shaft, and the rotating shaft cannot rotate.
According to the utility model discloses a preferred technical scheme, the speed limit part includes support, ratchet, first pawl, second pawl, first connecting rod, second electro-magnet and spring, wherein: the support is fixedly arranged on the ground of the machine room, and the ratchet wheel is fixedly arranged on the support; the rotating shaft penetrates through the center of the ratchet wheel, the middle parts of the first pawl and the second pawl are rotatably connected with the rotating shaft, two ends of the first connecting rod are respectively rotatably connected with the tail end of the first pawl and the head end of the second pawl, the head end of the second connecting rod is rotatably connected with the tail end of the second pawl, and the tail end of the second connecting rod is rotatably connected with the rotating shaft; the second connecting rod is a telescopic connecting rod, a spring is sleeved on the second connecting rod, and two ends of the spring are fixedly connected with the head end and the tail end of the second connecting rod respectively;
the electrification and the outage of the second electromagnet are controlled by the control part; under the state of no speed limitation, the head end of the first pawl is fixed with the tail end of the second connecting rod through the second electromagnet, and the spring is in a stretching state; under the speed limiting state, the head end of the first pawl is separated from the tail end of the second connecting rod, and the spring restores to the natural length.
Further preferably, the speed limiting component is mounted at the tail end of the rotating shaft, and the first pawl, the second pawl, the first connecting rod, the second electromagnet and the spring are mounted on the end face of the tail end of the rotating shaft.
Further preferably, shaft shoulders are symmetrically arranged at the outer sides of the two grooved wheels in the middle of the rotating shaft, and the first pawl, the second pawl, the first connecting rod, the second electromagnet and the spring are mounted on the end faces of the shaft shoulders.
Further preferably, the speed detector is an infrared detector including an infrared transmitter disposed on the car and an infrared receiver disposed on the car or at the bottom of the elevator hoistway.
Further preferably, the emergency buttons are two and are respectively arranged on two sides of the car.
Preferably, the number of the sheaves is at least two, and each sheave is provided with at least three traction steel ropes.
Further preferably, the number of the grooved wheels is 2, and the grooved wheels are symmetrically arranged in the middle of the rotating shaft.
Compared with the prior art, the utility model discloses following beneficial technological effect has:
the lifting device for guaranteeing the safety of the elevator can quickly prevent the elevator from falling or rising when the elevator meets an emergency condition due to the arrangement of the second driving component, quickly recover the normal work of the elevator, realize primary protection, prevent the elevator from being clamped in the elevator shaft between the upper and lower floors, prevent people from quickly leaving the elevator car and cause people to generate continuous fear; meanwhile, the arrangement of the speed limiting component ensures the safety protection of the elevator after the emergency button is not pressed down, further improves the safety reliability of the elevator in emergency and realizes secondary protection. The utility model discloses a hoisting device of guarantee elevator safety is showing the fail safe nature who has improved the elevator when emergency, is favorable to passenger's physical and mental health.
Drawings
Fig. 1 is a schematic structural view of a lifting device for ensuring the safety of an elevator (a speed limiting component is installed at the end of a rotating shaft).
Fig. 2 is a sectional view of the joint of the second driven gear and the rotating shaft (showing the key and the first electromagnet).
Fig. 3 is a schematic structural view of the speed limiting member of the present invention mounted at the end of the rotating shaft.
Fig. 4 is a schematic structural view of the lifting device for ensuring the safety of the elevator (the speed limiting component is installed at the middle part of the rotating shaft and is located at two sides of the sheave).
Fig. 5 is a schematic structural view of the speed limiting member of the present invention installed in the middle of the rotating shaft.
In the figure: 10-car, 20-car guide rail, 30-first drive assembly, 40-second drive assembly, 50-rotating shaft, 60-grooved pulley, 70-traction steel rope, 80-emergency button, 90-first electromagnet, 100-key, 110-speed detector and 120-speed limiting component;
31-a first driving motor, 32-a first driving gear, 33-a first driven gear, 41-a second driving motor, 42-a second driving gear, 43-a second driven gear, 51-a rotating shaft key groove and 431-a driven gear key groove;
121-support, 122-ratchet, 123-first pawl, 124-second pawl, 125-first connecting rod, 126-second connecting rod, 127-second electromagnet and 128-spring.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the lifting device for ensuring the safety of an elevator of the present invention includes a car 10, a car guide rail 20, a first driving assembly 30, a second driving assembly 40, a rotating shaft 50, a sheave 60, a traction rope 70, an emergency button 80, a speed detector 110, a speed limiting member 120, and a control part, wherein:
the car 10 is movable up and down along the car guide rails 20, and the emergency button 80 is provided in the car 10 so as to be pressed by an occupant seated in the car in an emergency; the first driving assembly 30 includes a first driving motor 31, a first driving gear 32 driven by the first driving motor 31, and a first driven gear 33 driven by the first driving gear 32; the second driving assembly 40 includes a second driving motor 41, a second driving gear 42 driven by the second driving motor 41, and a second driven gear 43 driven by the second driving gear 42; the first driven gear 33 is fixedly installed at one end of the rotating shaft, the second driven gear 43 is installed at the other end of the rotating shaft 50, and the rotating shaft 50 is driven by the first driven gear 33 or the second driven gear 43.
The number of the grooved wheels 60 is 2, the rotating shaft 50 passes through the center of the grooved wheels 60 and is fixedly connected with the grooved wheels 60 in the middle, and the two grooved wheels 60 are symmetrically arranged in the middle of the rotating shaft 50; one end of the traction cable 70 is fixedly connected to the top of the car 10, the other end is fixedly connected to a counterweight system (not shown) of the elevator, and the middle part is wound on the sheave 60; a rotating shaft key groove 51 is formed in a part of the rotating shaft 50 penetrating through the second driven gear 43, a corresponding driven gear key groove 431 is formed in a corresponding part of the second driven gear 43, and a first electromagnet 90 and a key 100 are installed at the bottom of the rotating shaft key groove 51; when energized, the key 100 is held in the spindle keyway 51 by the first electromagnet 90.
The first driving motor 31, the second driving motor 41, the emergency button 80 and the speed detector 110 are all communicably connected to the control unit, and the control unit controls the energization and the deenergization of the first electromagnet 90; the speed limiting member 120 is used to limit the rotation of the rotary shaft 50 when the elevator is out of control and falls to a preset maximum speed value.
When the emergency button 80 is pressed, the control part controls the first electromagnet 90 to be powered off, the upper end of the key 100 is thrown into the driven gear key groove 431, and the lower end of the key is left in the rotating shaft key groove 51, so that the rotating shaft 50 is driven to rotate by the rotation of the second driven gear 43, and the car 10 is lifted upwards or descended downwards; when the emergency button 80 is not pressed down, and the speed detector 110 detects that the lifting or lowering speed of the car 10 reaches a preset maximum speed value, the control part controls the speed limiting component 120 to clamp the rotating shaft 50, so that the rotating shaft 50 cannot rotate.
The lifting device for guaranteeing the safety of the elevator is provided with the second driving component 40, so that when the elevator meets an emergency, the elevator can be quickly prevented from falling or rising, and the normal work of the elevator can be quickly recovered, so that the elevator is prevented from being clamped in an elevator shaft between an upper floor and a lower floor, and primary protection is realized; meanwhile, the arrangement of the speed limiting component 120 further improves the safety and reliability of the elevator in emergency, and realizes secondary protection. The utility model discloses a hoisting device of guarantee elevator safety is showing the fail safe nature who has improved the elevator when emergency, is favorable to passenger's physical and mental health.
It should be noted that the strength of the key 100 is large enough to enable the key 100 to transmit torque between the second driven gear 43 and the rotating shaft 50. The size and the length of the key can be reasonably set by a person skilled in the art according to the design weight of the lift car, the number of people, the weight, the diameter of the rotating shaft and other parameters so as to meet the requirement of safety.
According to the present invention, the speed limiting member 120 may be a structure that limits the rotation of the rotating shaft, such as a ratchet or a structure similar to a speed limiter, which is commonly used in the art. When the ratchet wheel backstop is arranged, the ratchet wheel of the ratchet wheel backstop is fixedly connected with the rotating shaft, and the pawl of the ratchet wheel backstop is fixedly arranged on the floor of the machine room.
According to a specific scheme of the embodiment, the speed limiting component 120 comprises a support 121, a ratchet wheel 122, a first pawl 123, a second pawl 124, a first connecting rod 125, a second connecting rod 126, a second electromagnet 127 and a spring 128, wherein:
the support 121 is fixedly installed on the ground of the machine room, and the ratchet wheel 122 is fixedly installed on the support 121; the rotating shaft 50 passes through the center of the ratchet wheel 121, the middle parts of the first pawl 123 and the second pawl 124 are rotatably connected with the rotating shaft 50, two ends of the first connecting rod 125 are rotatably connected with the tail end of the first pawl 123 and the head end of the second pawl 124 respectively, the head end of the second connecting rod 126 is rotatably connected with the tail end of the second pawl 124, and the tail end is rotatably connected with the rotating shaft 50; the second connecting rod 126 is a telescopic connecting rod, the spring 128 is sleeved on the second connecting rod 126, and two ends of the spring 128 are respectively fixedly connected with the head end and the tail end of the second connecting rod 126;
the second electromagnet 127 is controlled by the control unit to be energized or de-energized; in the non-speed-limiting state, the head end of the first pawl 123 is fixed to the tail end of the second connecting rod 126 through the second electromagnet 127, and the spring 128 is in a stretching state; in the speed limit state, the head end of the first pawl 123 is separated from the tail end of the second link 126, and the spring 128 returns to the natural length.
The installation position of the speed limiting member 120 is not limited, and the speed limiting member may be installed at the end of the rotating shaft or between the ends of the rotating shaft as long as the rotation of the rotating shaft 50 can be limited when the elevator runaway falls to a preset speed value, for example:
as shown in fig. 1 and 3, according to one aspect, the speed limiting member 120 is installed at the distal end of the rotation shaft 50, and the first pawl 123, the second pawl 124, the first link 125, the second link 126, the second electromagnet 127 and the spring 128 are installed at the end surface of the distal end of the rotation shaft 50.
As shown in fig. 4 and 5, according to another case, the middle portion of the rotating shaft 50 is symmetrically provided with shoulders at the outer sides of the two sheaves 60, respectively, and the first pawl 123, the second pawl 124, the first link 125, the second link 126, the second electromagnet 127 and the spring 128 are mounted on end surfaces of the shoulders.
Annular rings can be respectively fixedly sleeved on the peripheries of the middle parts of the rotating shafts, and the first pawl 123, the second pawl 124, the first connecting rod 125, the second connecting rod 126, the second electromagnet 127 and the spring 128 are arranged on the end faces of the annular rings.
It should be noted that the second connecting rod 126 is a telescopic connecting rod, and is similar to a telescopic draw-bar box draw-bar, a telescopic clothes-horse, etc. Ensuring that when the spring 128 is in tension, the second link 126 is in an extended state and when the spring 128 returns to its natural length, the second link 126 contracts.
It should be noted that the speed detector 110 is a conventional speed detector for sensing the speed of an elevator in the prior art, as can be easily understood by those skilled in the art. For example:
the speed detector can be infrared detector, infrared detector includes infrared emitter and infrared receiver, infrared emitter sets up on the car, infrared receiver sets up on the car, this moment infrared detector is reflective infrared detector.
Or an infrared receiver is arranged at the bottom of the elevator shaft, and in this case, the infrared detector is a correlation type infrared detector.
The information received by the infrared receiver is converted into a signal, the signal is amplified and then transmitted to the control part, and the control part receives the amplified signal, calculates the actual running speed of the elevator and compares the actual running speed with a preset maximum speed value. When the actual running speed is higher than the preset maximum speed value, the elevator is considered to be in a rapid falling state, the control part sends an instruction to perform power-off treatment on the second electromagnet, and then the limit component rapidly clamps the rotating shaft, so that the elevator is prevented from continuously falling.
It should be noted that the number of the sheaves 60 may not be limited, and at least two sheaves 60 may be provided in case of ensuring safety.
It should be noted that the number of the traction ropes 70 on the sheaves 60 is not limited, and at least three traction ropes 70 are provided on each sheave 60 under the condition of ensuring safety.
According to the utility model discloses, the control part includes control circuit, presses emergency button 80 can communicate control circuit makes simultaneously first electro-magnet outage to start second drive assembly's second driving motor corotation or reversal.
Those skilled in the art will readily appreciate that the raising or lowering of the car may be controlled by forward or reverse rotation of the motor.
Those skilled in the art will readily appreciate that the first drive assembly 30, the second drive assembly 40, the shaft 50 and the sheave 60 are all mounted in a machine room above the car 10.
Preferably, the emergency buttons 80 are two and are respectively disposed at both sides of the car 10. According to the arrangement, the probability of pressing the emergency button in the emergency situation of the elevator can be improved, and therefore the safety of the elevator is improved.
With reference to fig. 1 to 5, the utility model discloses a guarantee elevator safety's hoisting device moves:
(1) when the elevator normally operates, the control part controls the first driving motor 31 to drive the first driving gear 32 to rotate, so as to drive the first driven gear 33 to rotate, thereby driving the rotating shaft 50 to rotate, so that the sheave 60 can wind up or release the traction steel rope, and the elevator can safely ascend and descend.
(2) When the emergency button 80 is pressed when the elevator has an emergency, the control part controls the first electromagnet 90 to be powered off, and the key 100 is thrown into the driven gear groove 431 of the second driven gear 43 at the moment of power off and forms effective matching; meanwhile, the second driving motor 41 is started to drive the second driving gear 42, the second driven gear 43 and the rotating shaft 50 to rotate, so that the sheave 60 is used for winding or releasing the traction rope, thereby ensuring the safe lifting of the elevator in an emergency.
(3) If the emergency button 80 cannot be pressed in an emergency, the elevator rapidly ascends or descends, when the running speed of the elevator reaches a preset maximum speed value, the control part controls the second electromagnet 127 to automatically power off, the first pawl 123 and the second pawl 124 are clamped into the ratchet wheel 122 under the action of centrifugal force, the rotating shaft 50 is forced to stop rotating, and therefore the elevator is prevented from continuously and rapidly ascending or rapidly falling, and the safety of the elevator is guaranteed.
The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are intended to be within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (8)
1. The utility model provides a guarantee elevator safety's hoisting device, its characterized in that includes car, car guide rail, first drive assembly, second drive assembly, pivot, sheave, traction cable, emergency button, speed detector, speed limit part and control division, wherein:
the car can move up and down along the car guide rail, and the emergency button is arranged in the car; the first driving assembly comprises a first driving motor, a first driving gear driven by the first driving motor and a first driven gear driven by the first driving gear; the second driving assembly comprises a second driving motor, a second driving gear driven by the second driving motor and a second driven gear driven by the second driving gear; the first driven gear is fixedly arranged at one end of the rotating shaft, the second driven gear is arranged at the other end of the rotating shaft, and the rotating shaft is driven by the first driven gear or the second driven gear;
the rotating shaft penetrates through the center of the sheave and is fixedly connected with the sheave in the middle, one end of the traction steel rope is fixedly connected with the top of the car, the other end of the traction steel rope is fixedly connected with a counterweight system of the elevator, and the middle part of the traction steel rope is wound on the sheave; a rotating shaft key groove is formed in the position, penetrating through the second driven gear, of the rotating shaft, a corresponding driven gear key groove is formed in the corresponding position of the second driven gear, and a first electromagnet and a key are installed at the bottom of the rotating shaft key groove; when the power is on, the key is attracted in the key groove of the rotating shaft by the first electromagnet;
the first driving motor, the second driving motor, the emergency button and the speed detector are all connected with the control part in a communication mode, and the electrification and the outage of the first electromagnet are controlled by the control part; the speed limiting component is used for limiting the rotation of the rotating shaft when the elevator is out of control and falls to a preset maximum speed value.
2. The lifting device for ensuring the safety of an elevator as claimed in claim 1, wherein the speed limiting member comprises a support, a ratchet wheel, a first pawl, a second pawl, a first connecting rod, a second electromagnet and a spring, wherein: the support is fixedly arranged on the ground of the machine room, and the ratchet wheel is fixedly arranged on the support; the rotating shaft penetrates through the center of the ratchet wheel, the middle parts of the first pawl and the second pawl are rotatably connected with the rotating shaft, two ends of the first connecting rod are respectively rotatably connected with the tail end of the first pawl and the head end of the second pawl, the head end of the second connecting rod is rotatably connected with the tail end of the second pawl, and the tail end of the second connecting rod is rotatably connected with the rotating shaft; the second connecting rod is a telescopic connecting rod, a spring is sleeved on the second connecting rod, and two ends of the spring are fixedly connected with the head end and the tail end of the second connecting rod respectively;
the electrification and the outage of the second electromagnet are controlled by the control part; under the state of no speed limitation, the head end of the first pawl is fixed with the tail end of the second connecting rod through the second electromagnet, and the spring is in a stretching state; under the speed limiting state, the head end of the first pawl is separated from the tail end of the second connecting rod, and the spring restores to the natural length.
3. The lifting device for ensuring the safety of an elevator according to claim 2, wherein the speed limiting member is installed at the end of the rotating shaft, and the first pawl, the second pawl, the first link, the second electromagnet and the spring are installed on the end surface of the end of the rotating shaft.
4. The lifting device for ensuring the safety of an elevator according to claim 2, wherein a shaft shoulder is symmetrically arranged at the middle part of the rotating shaft at the outer side of each of the two grooved pulleys, and the first pawl, the second pawl, the first connecting rod, the second electromagnet and the spring are arranged on the end surface of the shaft shoulder.
5. The hoist of claim 2, characterized in that the speed detector is an infrared detector, the infrared detector includes an infrared transmitter and an infrared receiver, the infrared transmitter is disposed on the car, and the infrared receiver is disposed on the car or at the bottom of the elevator hoistway.
6. The lifting device for ensuring the safety of an elevator as recited in claim 1, wherein the emergency button is provided in two numbers, respectively, on both sides of the car.
7. A hoisting device as claimed in any one of claims 1 to 6, characterized in that at least two sheaves are provided, and at least three traction ropes are provided per sheave.
8. The lifting device for ensuring the safety of an elevator according to claim 7, wherein the number of the sheaves is 2, and the sheaves are symmetrically arranged in the middle of the rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921775336.XU CN211169390U (en) | 2019-10-22 | 2019-10-22 | Lifting device for guaranteeing elevator safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921775336.XU CN211169390U (en) | 2019-10-22 | 2019-10-22 | Lifting device for guaranteeing elevator safety |
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| CN211169390U true CN211169390U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921775336.XU Active CN211169390U (en) | 2019-10-22 | 2019-10-22 | Lifting device for guaranteeing elevator safety |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456265A (en) * | 2020-11-23 | 2021-03-09 | 武汉市威斯德智能装备有限公司 | Novel elevator power failure emergency control rescue device |
| CN112827091A (en) * | 2021-01-25 | 2021-05-25 | 列耀乐 | Automatic control emergency stop rope pulley for forest rescue |
-
2019
- 2019-10-22 CN CN201921775336.XU patent/CN211169390U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456265A (en) * | 2020-11-23 | 2021-03-09 | 武汉市威斯德智能装备有限公司 | Novel elevator power failure emergency control rescue device |
| CN112827091A (en) * | 2021-01-25 | 2021-05-25 | 列耀乐 | Automatic control emergency stop rope pulley for forest rescue |
| CN112827091B (en) * | 2021-01-25 | 2022-07-22 | 列耀乐 | Automatic control emergency stop rope pulley for forest rescue |
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