CN111824894A - Elevator safety system using gas flow velocity in elevator shaft as trigger condition - Google Patents
Elevator safety system using gas flow velocity in elevator shaft as trigger condition Download PDFInfo
- Publication number
- CN111824894A CN111824894A CN202010799822.6A CN202010799822A CN111824894A CN 111824894 A CN111824894 A CN 111824894A CN 202010799822 A CN202010799822 A CN 202010799822A CN 111824894 A CN111824894 A CN 111824894A
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- Prior art keywords
- elevator
- fixedly connected
- rod
- brake
- space
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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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
- B66B5/044—Mechanical overspeed governors
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention discloses an elevator safety system using the gas flow velocity in an elevator well as a triggering condition, which comprises elevator slide rails, wherein an elevator upper space is arranged at the inner sides of the two elevator slide rails, two upper primary brakes and two lower primary brakes are connected in the two elevator slide rails in a sliding manner, the two upper primary brakes are symmetrically distributed about the vertical central line of the elevator upper space, the two lower primary brakes are symmetrically distributed about the vertical central line of the elevator upper space, the relative flow velocity of the gas flowing relatively above and below the elevator during the operation of the elevator is used as the basis for judging the descending speed of the elevator, and a two-stage braking system is arranged to ensure that the elevator can be safer when encountering danger.
Description
Technical Field
The invention relates to the field related to wind energy, in particular to an elevator safety system using the gas flow velocity in an elevator shaft as a trigger condition.
Background
The elevator is widely applied in daily life of people, a centrifugal speed limiting wheel is often used in an elevator safety system nowadays to prevent the elevator from overspeed, but the centrifugal wheel is dependent on the magnitude between the centrifugal force and the pre-tightening force of a spring to trigger the operation of a clamping block, the durable spring is high in manufacturing cost, and the centrifugal wheel cannot normally operate under the condition that the speed limiting wheel is clamped, so that a new basis is significant as the standard for triggering a brake.
Disclosure of Invention
The present invention aims to provide an elevator safety system using the gas flow rate in the elevator shaft as a trigger condition to solve the problems of the background art.
In order to achieve the purpose, the invention provides the following technical scheme: an elevator safety system using the gas flow velocity in an elevator well as a triggering condition comprises two elevator slide rails, wherein the inner sides of the two elevator slide rails are provided with an elevator upper space, the two elevator slide rails are connected with two upper primary brakes and two lower primary brakes in a sliding manner, the two upper primary brakes are symmetrically distributed about a vertical central line of the elevator upper space, the two lower primary brakes are symmetrically distributed about a vertical central line of the elevator upper space, the right side of the upper primary brake is fixedly connected with an elevator main body, the inner side of the elevator main body is provided with an elevator space, the upper side surface of the elevator main body is fixedly connected with an oscillating bar back plate, the front side surface of the oscillating bar back plate is fixedly connected with an oscillating bar hinge, the upper brake is connected with an oscillating bar in a rotating manner, the right, the elevator is characterized in that the wind blocking cup can create a large wind resistance in the windward state to enable the swing rod to rotate around the swing rod hinge, a wind blocking device is arranged on the upper side of the central ejector rod, a primary rail braking device is arranged on the lower side of the wind blocking device, a secondary rail braking device is arranged on the lower side of the rail braking device, two upper drainage covers which are symmetrical left and right relative to the vertical central line of the elevator space are fixedly connected to the upper side face of the elevator main body, incoming flows from the lower side can be gathered through the upper drainage covers, and therefore the wind blocking cup can generate a large wind resistance, and wind power detection is accurate.
As preferred, wind-force arresting gear about the vertical central line symmetric distribution in elevator space, wind-force arresting gear includes the pendulum rod left side is articulated have the ejector pin, the ejector pin with elevator main part sliding connection, the ejector pin downside articulates there is the slide, slide sliding connection in inside wall about the elevator space, side fixedly connected with trigger bar on the slide, the trigger bar with fixedly connected with slide spring between the slide, slide downside fixedly connected with central ejector pin, fixedly connected with downside trigger bar on the central ejector pin.
Preferably, the primary track braking device comprises two upper primary brakes and two lower primary brakes, the upper primary brakes and the lower primary brakes have the same internal structure and are only triggered differently, a braking space is arranged in the upper primary brakes, a braking chute is formed in the upper primary brakes, primary braking executing mechanisms are arranged in the braking space and are symmetrically distributed in the front and back direction, braking abutting blocks are connected to the upper side surfaces of the upper primary brakes in a sliding manner, braking connecting rods are hinged to the upper side surfaces of the braking abutting blocks, two braking connecting rods are hinged to the braking executing push rods together, the rear side surfaces of the braking abutting blocks can abut against the elevator sliding rails, braking trigger springs are fixedly connected between the braking executing push rods and the upper primary brakes, and braking abutting blocks are fixedly connected to the upper side surfaces of the braking executing push rods, the upper side surface of the inner wall of the braking space is fixedly connected with a braking trigger rod, the right side surface of the braking trigger rod is abutted with the left side surface of the braking abutting block so as to limit the leftward movement trend of the braking execution push rod, the upper primary braking right side surface is slidably connected with a main trigger rod, the main trigger rod is fixedly connected with a main trigger rod protrusion, the protrusion surface of the main trigger rod can be abutted with the braking trigger rod, so that the braking trigger rod slides upwards, and the main trigger rod can be abutted with the trigger rod so as to limit the leftward movement trend of the main trigger rod.
Preferably, the secondary track brake device is symmetrically distributed about the vertical central line of the central ejector rod, the lower side surface of the elevator main body is fixedly connected with a drainage cover chute, the lower side surface of the drainage cover chute is slidably connected with two lower drainage covers, the lower side surface of the lower drainage cover chute is fixedly connected with a lower side drainage cover hinge, a lower side drainage cover sliding rod is rotatably connected onto the lower side drainage cover hinge, a drainage cover space is arranged at the lower side of the elevator space, an elevator lower space is arranged at the lower side of the drainage cover space, a lower side trigger rod slide way is arranged at the lower side of the elevator main body, the front side surface of the lower side trigger rod slide way is slidably connected with the lower side trigger rod, two lower ejector rods are hinged at the rear side of the lower side trigger rod slide way, the lower side ejector rods are hinged with an air pump rod on a composite hinge, the air pump support piece downside with the drainage cover offsets down, drainage cover space trailing flank fixedly connected with gas tank casing, sliding connection has the gas tank valve on the gas tank casing, the gas tank valve with fixedly connected with gas tank spring between the gas tank casing, gas tank casing left side fixedly connected with air pump casing, be equipped with the air pump space in the air pump casing, air pump pole right side fixedly connected with air pump piston, the air pump piston with air pump casing sliding connection.
In conclusion, the beneficial effects of the invention are as follows: the relative flow velocity of the gas flowing relatively above and below the elevator during the operation of the elevator is used as the basis for judging the descending speed of the elevator, and the two-stage braking system is arranged to ensure that the elevator can be safer when encountering danger.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall fully sectioned front view of an elevator safety system using a gas flow rate in a hoistway as a trigger condition according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention will now be described in detail with reference to fig. 1-3, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, front and rear directions described below correspond to the front, back, left, right, top and bottom directions of the view direction of fig. 1, fig. 1 is a front view of the apparatus of the present invention, and the directions shown in fig. 1 correspond to the front, back, left, right, top and bottom directions of the apparatus of the present invention.
Referring to fig. 1-3, an embodiment of the present invention is shown: an elevator safety system using the gas flow velocity in an elevator well as a triggering condition comprises elevator slide rails 11, an elevator upper space 12 is arranged on the inner sides of the two elevator slide rails 11, two upper primary brakes 15 and two lower primary brakes 30 are connected in the two elevator slide rails 11 in a sliding manner, the two upper primary brakes 15 are symmetrically distributed about the vertical central line of the elevator upper space 12, the two lower primary brakes 30 are symmetrically distributed about the vertical central line of the elevator upper space 12, an elevator main body 20 is fixedly connected to the right side of the upper primary brake 15, an elevator space 18 is arranged on the inner side of the elevator main body 20, a swing rod back plate 25 is fixedly connected to the upper side of the elevator main body 20, a swing rod hinge 22 is fixedly connected to the front side of the swing rod back plate 25, a swing rod 21 is rotatably connected to the upper side, and a, the left side of the swing rod hinge 22 is fixedly connected with a wind blocking cup 13, the wind blocking cup 13 can create a large wind resistance in a windward state to enable the swing rod 21 to rotate around the swing rod hinge 22, the upper side of the central ejector rod 19 is provided with a wind blocking device, the lower side of the wind blocking device is provided with a primary track braking device, the lower side of the track braking device is provided with a secondary track braking device, the upper side of the elevator main body 20 is fixedly connected with two upper drainage covers 14 which are symmetrical left and right relative to the vertical central line of the elevator space 18, and the upper drainage covers 14 can enable incoming flows below to be gathered, so that the wind blocking cup 13 can generate a larger wind resistance, and wind power detection is more accurate.
In addition, in one embodiment, the wind force blocking device is symmetrically distributed about the vertical center line of the elevator space 18, and the wind force blocking device comprises the swing rod 21, the left side of which is hinged with the ejector rod 24, the ejector rod 24 is slidably connected with the elevator main body 20, the lower side of the ejector rod 24 is hinged with a sliding plate 17, the sliding plate 17 is slidably connected with the left and right inner side walls of the elevator space 18, the upper side of the sliding plate 17 is fixedly connected with a trigger rod 26, a sliding plate spring 28 is fixedly connected between the trigger rod 26 and the sliding plate 17, the lower side of the sliding plate 17 is fixedly connected with a central ejector rod 19, and the central ejector rod 19 is fixedly connected with a.
In addition, in one embodiment, the primary rail brake device includes two upper primary brakes 15 and two lower primary brakes 30, the upper primary brakes 15 and the lower primary brakes 30 have the same internal structure and are only triggered differently, a brake space 32 is provided in the upper primary brakes 15, a brake chute 38 is provided on the upper primary brakes 15, a primary brake executing mechanism is provided in the brake space 32, the primary brake executing mechanisms are symmetrically distributed in the front and back direction, a brake abutting block 34 is slidably connected to the upper side surface of the upper primary brakes 15, a brake connecting rod 36 is hinged to the upper side surface of the brake abutting block 34, two brake connecting rods 36 are hinged to a brake executing push rod 42 together, the rear side surface of the brake abutting block 34 can abut against the elevator slide rail 11, and a brake triggering spring 37 is fixedly connected between the brake executing push rod 42 and the upper primary brakes 15, the upper side surface of the brake execution push rod 42 is fixedly connected with a brake abutting block 40, the upper side surface of the inner wall of the brake space 32 is fixedly connected with a brake trigger rod 41, the right side surface of the brake trigger rod 41 abuts against the left side surface of the brake abutting block 40 so as to limit the leftward movement trend of the brake execution push rod 42, the right side surface of the upper-stage brake 15 is slidably connected with a main trigger rod 16, a main trigger rod bulge 44 is fixedly connected to the main trigger rod 16, the surface of the main trigger rod bulge 44 can abut against the brake trigger rod 41 so as to enable the brake trigger rod 41 to slide upwards, and the main trigger rod 16 can abut against the trigger rod 26 so as to limit the leftward movement trend of the main trigger rod 16.
In addition, in one embodiment, the two-stage rail braking device is symmetrically distributed about the vertical center line of the central top rod 19, the lower side of the elevator main body 20 is fixedly connected with a drainage cover sliding groove 63, the lower side of the drainage cover sliding groove 63 is slidably connected with two lower drainage covers 31, the lower side of the lower drainage cover 31 is fixedly connected with a lower side drainage cover hinge 61, the lower side drainage cover hinge 61 is rotatably connected with a lower side drainage cover sliding rod 62, the lower side of the elevator space 18 is provided with a drainage cover space 48, the lower side of the drainage cover space 48 is provided with an elevator lower space 47, the lower side of the elevator main body 20 is provided with a lower side trigger rod slide way 50, the front side of the lower side trigger rod slide way 50 is slidably connected with the lower side trigger rod 49, the rear side of the lower side trigger rod slide way 50 is hinged with two lower side top, it supports pole 64 to rotate to be connected with the air pump on the compound hinge 23, the air pump supports pole 64 downside to articulate has the air pump to support piece 53, the air pump support piece 53 downside with drainage cover 31 offsets down, 48 trailing flank fixedly connected with gas holder housing 57 in drainage cover space, sliding connection has gas holder valve 60 on the gas holder housing 57, gas holder valve 60 with fixedly connected with gas holder spring 59 between the gas holder housing 57, gas holder housing 57 left side fixedly connected with air pump housing 55, be equipped with air pump space 56 in the air pump housing 55, air pump pole 52 right side fixedly connected with air pump piston 54, air pump piston 54 with air pump housing 55 sliding connection.
In the initial state, the air in the air tank 57 is in a high pressure state, the brake trigger spring 37 is stretched, the total trigger spring 43 is stretched, and the air pump piston 54 is in a force balance state.
When the elevator moves downwards, airflow in the space 47 below the elevator gathers towards the two wind resistance cups 13 along the surfaces of the lower guide cover 31 and the upper guide cover 14, so that a large wind resistance is obtained on the surfaces of the wind resistance cups 13, the swing rod 21 rotates around the swing rod hinge 22, the push rod 24 is pressed downwards, the two push rods 24 press the sliding plate 17, when the elevator descends in the elevator sliding rail 11 at an excessively high speed, the airflow has an excessively high resistance to the wind resistance cups 13, the downward sliding length of the push rod 24 is excessively long, the trigger rod 26 slides downwards, the trigger resisting rod 27 is not restrained by the trigger rod 26, the trigger resisting rod 27 slides under the action of the stretched main trigger spring 43, the main trigger rod bulge 44 moves leftwards, the surface of the main trigger rod bulge 44 abuts against the brake trigger rod 41, the brake trigger rod 41 slides upwards, and the brake trigger rod 41 does not abut against the brake abutting block 40, therefore, the restriction of the brake trigger rod 41 on the brake abutting block 40 is removed, so that the brake abutting block 40 moves leftwards under the action of the brake trigger spring 37, so that the brake abutting block 34 abuts against the elevator sliding rail 11, primary braking is completed, the central ejector rod 19 slides downwards while abutting against the air storage tank valve 60, so that the air storage tank valve 60 moves downwards, so that the air storage tank spring 59 is compressed, gas in the air storage tank shell 57 is discharged, so that the air pressure in the air pump space 56 is reduced, the balance state of the air pump piston 54 is destroyed, the air pump piston 54 slides downwards along the air pump shell 55, so that the air pump abutting block 53 does not abut against the lower drainage cover 31, so that the lower drainage cover sliding rod 62 slides upwards, the two lower drainage covers 31 rotate around the lower drainage cover hinge 61, and abut against the elevator sliding rail 11, and secondary braking is completed.
The invention has the beneficial effects that: the relative flow velocity of the gas flowing relatively above and below the elevator during the operation of the elevator is used as the basis for judging the descending speed of the elevator, and the two-stage braking system is arranged to ensure that the elevator can be safer when encountering danger.
The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.
Claims (4)
1. An elevator safety system using the gas flow velocity in an elevator shaft as a trigger condition comprises an elevator slide rail, and is characterized in that: an elevator upper space is arranged on the inner sides of the two elevator sliding rails, two upper primary brakes and two lower primary brakes are connected in the two elevator sliding rails in a sliding mode, the two upper primary brakes are symmetrically distributed about a vertical central line of the elevator upper space, the two lower primary brakes are symmetrically distributed about the vertical central line of the elevator upper space, an elevator main body is fixedly connected to the right side of the upper primary brake, an elevator space is arranged on the inner side of the elevator main body, a swing rod back plate is fixedly connected to the upper side face of the elevator main body, a swing rod hinge is fixedly connected to the front side face of the swing rod back plate, a swing rod is rotatably connected to the upper primary brake, an ejector rod is hinged to the right side of the swing rod, a wind blocking cup is fixedly connected to the left side of the swing rod hinge, and can create large, the upper side of the central ejector rod is provided with a wind power blocking device, the lower side of the wind power blocking device is provided with a primary track braking device, the lower side of the track braking device is provided with a secondary track braking device, the upper side surface of the elevator main body is fixedly connected with two upper drainage covers which are symmetrical about a vertical central line of an elevator space, and the upper drainage covers can enable incoming flows below to be gathered, so that the wind blocking cups can generate larger wind resistance, and wind power detection is more accurate.
2. An elevator safety system as defined in claim 1, wherein the elevator safety system is triggered by a gas flow rate in the elevator shaft, and further comprises: wind-force arresting gear about the vertical central line symmetric distribution in elevator space, wind-force arresting gear includes the pendulum rod left side is articulated to have the ejector pin, the ejector pin with elevator main part sliding connection, the ejector pin downside articulates there is the slide, slide sliding connection in inside wall about the elevator space, side fixedly connected with trigger bar on the slide, the trigger bar with fixedly connected with slide spring between the slide, slide downside fixedly connected with central ejector pin, fixedly connected with downside trigger bar on the central ejector pin.
3. An elevator safety system as defined in claim 1, wherein the elevator safety system is triggered by a gas flow rate in the elevator shaft, and further comprises: the primary track brake device comprises two upper primary brakes and two lower primary brakes, the upper primary brakes and the lower primary brakes have the same internal structure and are triggered in different manners, a brake space is arranged in the upper primary brakes, a brake chute is formed in the upper primary brakes, primary brake executing mechanisms are arranged in the brake space and are symmetrically distributed in the front and back direction, the upper side surfaces of the upper primary brakes are connected with brake abutting blocks in a sliding manner, the upper side surfaces of the brake abutting blocks are hinged with brake connecting rods, the two brake connecting rods are hinged with brake executing push rods together, the rear side surfaces of the brake abutting blocks can abut against the elevator slide rails, brake triggering springs are fixedly connected between the brake executing push rods and the upper primary brakes, and the upper side surfaces of the brake executing push rods are fixedly connected with brake abutting blocks, the upper side surface of the inner wall of the braking space is fixedly connected with a braking trigger rod, the right side surface of the braking trigger rod is abutted with the left side surface of the braking abutting block so as to limit the leftward movement trend of the braking execution push rod, the upper primary braking right side surface is slidably connected with a main trigger rod, the main trigger rod is fixedly connected with a main trigger rod protrusion, the protrusion surface of the main trigger rod can be abutted with the braking trigger rod, so that the braking trigger rod slides upwards, and the main trigger rod can be abutted with the trigger rod so as to limit the leftward movement trend of the main trigger rod.
4. An elevator safety system as defined in claim 1, wherein the elevator safety system is triggered by a gas flow rate in the elevator shaft, and further comprises: the second-level track braking device is symmetrically distributed about the vertical central line of the central ejector rod, the lower side surface of the elevator main body is fixedly connected with a drainage cover chute, the lower side surface of the drainage cover chute is slidably connected with two lower drainage covers, the lower side surface of the lower drainage cover chute is fixedly connected with a lower side drainage cover hinge, a lower side drainage cover sliding rod is rotatably connected onto the lower side drainage cover hinge, the lower side of the elevator space is provided with a drainage cover space, the lower side of the drainage cover space is provided with an elevator lower space, the lower side of the elevator main body is provided with a lower side trigger rod slide way, the front side surface of the lower side trigger rod slide way is slidably connected with a lower side trigger rod, the rear side surface of the lower side trigger rod slide way is hinged with two lower ejector rods, the lower side ejector rods are hinged with an air pump rod, the air pump support piece downside with the drainage cover offsets down, drainage cover space trailing flank fixedly connected with gas tank casing, sliding connection has the gas tank valve on the gas tank casing, the gas tank valve with fixedly connected with gas tank spring between the gas tank casing, gas tank casing left side fixedly connected with air pump casing, be equipped with the air pump space in the air pump casing, air pump pole right side fixedly connected with air pump piston, the air pump piston with air pump casing sliding connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010799822.6A CN111824894A (en) | 2020-08-11 | 2020-08-11 | Elevator safety system using gas flow velocity in elevator shaft as trigger condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010799822.6A CN111824894A (en) | 2020-08-11 | 2020-08-11 | Elevator safety system using gas flow velocity in elevator shaft as trigger condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111824894A true CN111824894A (en) | 2020-10-27 |
Family
ID=72921038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010799822.6A Withdrawn CN111824894A (en) | 2020-08-11 | 2020-08-11 | Elevator safety system using gas flow velocity in elevator shaft as trigger condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111824894A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268565A (en) * | 2020-11-10 | 2021-01-26 | 谭秀兰 | Device for carrying out quick cost audit on elevator shaft |
| CN112707266A (en) * | 2020-12-22 | 2021-04-27 | 住友富士电梯有限公司 | Safe elevator that can prevent falling |
| CN113353756A (en) * | 2021-05-11 | 2021-09-07 | 重庆市华创电梯部件有限公司 | Elevator overspeed protection device |
-
2020
- 2020-08-11 CN CN202010799822.6A patent/CN111824894A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268565A (en) * | 2020-11-10 | 2021-01-26 | 谭秀兰 | Device for carrying out quick cost audit on elevator shaft |
| CN112707266A (en) * | 2020-12-22 | 2021-04-27 | 住友富士电梯有限公司 | Safe elevator that can prevent falling |
| CN112707266B (en) * | 2020-12-22 | 2022-04-22 | 住友富士电梯有限公司 | Safe elevator that can prevent falling |
| CN113353756A (en) * | 2021-05-11 | 2021-09-07 | 重庆市华创电梯部件有限公司 | Elevator overspeed protection device |
| CN113353756B (en) * | 2021-05-11 | 2022-07-19 | 重庆市华创电梯部件有限公司 | Elevator overspeed protection device |
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Application publication date: 20201027 |