CN112744681A - Brake locking mechanism for elevator emergency - Google Patents
Brake locking mechanism for elevator emergency Download PDFInfo
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- CN112744681A CN112744681A CN202110034712.5A CN202110034712A CN112744681A CN 112744681 A CN112744681 A CN 112744681A CN 202110034712 A CN202110034712 A CN 202110034712A CN 112744681 A CN112744681 A CN 112744681A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B17/00—Hoistway equipment
- B66B17/34—Safe lift clips; Keps
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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
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/26—Positively-acting devices, e.g. latches, knives
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a brake locking mechanism for an elevator in an emergency state, which comprises a brake mechanism, wherein the brake mechanism comprises a long rail, a support shell, a transmission wheel, a centrifugal slide block, a sleeve wheel, a locking gear, a locking rack and a brake block; the driving wheel is provided with a first spring and a chute, the centrifugal slider is connected with the driving wheel in a sliding manner, the first spring is connected with the centrifugal slider and the driving wheel, and the inner side wall of the sleeve wheel is provided with inner teeth matched with the centrifugal slider; the sleeve wheel is connected with the locking gear, the locking rack is connected with the supporting shell in a sliding mode, the locking gear is matched with the locking rack, one end of the brake block is in contact with the long rail, and the locking rack is in contact with the brake block. The invention provides a brake locking mechanism for an elevator in an emergency state, which can play a role in emergency braking in the process of accelerating the elevator to descend when the elevator stalls, so that the reliability of the elevator is improved; and the whole braking mechanism is realized through a pure mechanical structure, and the emergency braking function can be also realized under the special conditions of elevator power failure or controller failure and the like, so that the safety of the elevator is further ensured.
Description
Technical Field
The invention relates to the field of elevators, in particular to a brake locking mechanism for an elevator in an emergency state.
Background
The elevator as a vertical transportation vehicle plays an irreplaceable role in our daily life and work. As a mechanical and electrical integration product, the structure of the elevator is very complex, and the safety factor is far higher than that of other electrical products, however, even if the elevator is used, the elevator equipment still has a plurality of safety problems. Existing elevators are generally provided with a backup emergency braking system, but the emergency braking system of existing elevators is generally electrically controlled, in extreme cases: if the elevator is powered off, the standby power supply fails, and the controller is damaged, the normal work of the emergency braking system cannot be guaranteed, and certain potential safety hazards still exist. Therefore, a braking locking mechanism for an elevator in an emergency state needs to be designed, so that the elevator can be stably locked after emergency braking, the situation that the elevator descends at a high speed and is not stopped can be avoided, the bolt extends out, and huge impact caused by instant stopping is avoided.
Chinese patent application publication No. CN206069138U, published as 2017, 5.04.2017, entitled "emergency braking elevator", discloses the utility model discloses an emergency braking elevator, include: counterweight, hauler, car, assembly pulley, wire rope, emergency braking device and emergency braking button, be connected through hauler, assembly pulley and wire rope between counterweight and the car, emergency braking device includes signal transfer mechanism and arrestment mechanism, signal transfer mechanism conveys emergency signal, arrestment mechanism be for set up in braking structure on all pulleys of assembly pulley, emergency braking button set up in on the railway carriage or compartment door in the car. Adopt the utility model discloses, when emergency appeared, after pressing emergency braking button, signal transmission mechanism conveys emergency signal to the control system of driving sheave, has stopped the action of towing of hauler, on the other hand, the action of tightening up, the friction is done to arrestment mechanism's anchor clamps structure wire rope makes wire rope stop sliding to force the car to stop the up-and-down motion. However, the emergency braking of the elevator needs to be controlled manually, and the situation that the elevator is operated by mistake or cannot be operated by people can occur.
Disclosure of Invention
The invention aims to solve the problem that an elevator emergency braking system possibly fails under extreme conditions in the prior art, and provides a braking locking mechanism for an elevator emergency state, which can ensure that the elevator can be stably locked after emergency braking, can prevent a bolt from extending out when the elevator descends at a high speed and is not braked, and avoids huge impact caused by instant braking.
In order to achieve the purpose, the invention adopts the following technical scheme:
an elevator emergency braking mechanism is characterized by comprising a braking mechanism and a locking mechanism, wherein the braking mechanism comprises a supporting shell and a locking rack for emergency braking; the locking mechanism comprises a bolt, a rotating shaft, a centrifugal rod, a connecting rod, a telescopic block, a third spring and a baffle plate; the rotating shaft is connected with the driving wheel, one end of the centrifugal rod is hinged with the rotating shaft, the telescopic block is sleeved on the rotating shaft and is in sliding connection with the rotating shaft, one end of a third spring is connected with the telescopic block, the other end of the third spring is connected with the rotating shaft, one end of a connecting rod is hinged with the telescopic block, the other end of the connecting rod is hinged with the centrifugal rod, the bolt is in sliding connection with the supporting shell, the supporting shell is provided with a through hole, the baffle is arranged on the through hole, and the baffle is connected with the; the long rail is provided with a plurality of clamping grooves or clamping holes matched with the bolts.
Among the above-mentioned technical scheme, locking mechanism can stop the elevator at brake mechanism back, inserts the bolt draw-in groove or the card hole on the long rail, makes elevator position card die, can not remove, stable wait rescue. When the elevator normally runs, the baffle is fixed with the locking rack to block the through hole, and the bolt cannot extend out. When elevator stall falls down fast, the baffle removes along with locking rack, expose the through-hole, before the elevator stops, the drive wheel drives the pivot and rotates, when the centrifugal lever rotates, outwards expand under the effect of centrifugal force, the elasticity that the third spring was overcome to the flexible piece is pulled back, after the elevator was stopped by brake mechanism, the drive wheel stall, flexible piece pricks to the motion of bolt one side under the effect of third spring, drive the bolt and stretch out the through-hole, the bolt can insert draw-in groove or card hole, make elevator position card die. Above-mentioned technical scheme both can guarantee to be by stable locking after the elevator emergency braking, can avoid the elevator to descend again and when not stopped by the braking, the bolt stretches out, has avoided stopping in the twinkling of an eye to bring huge impact.
Preferably, a balancing weight is arranged at one end of the centrifugal rod, which is far away from the rotating shaft. The structure can increase the centrifugal force when the centrifugal rod rotates.
Preferably, a fourth spring is sleeved on the outer side of the bolt, one end of the fourth spring is connected with the bolt, and the other end of the fourth spring is connected with the supporting shell; the fourth spring pushes the bolt to one side of the telescopic block, and the elasticity of the third spring is larger than that of the fourth spring. The structure can avoid the bolt mistake to stretch out after the baffle is opened.
Preferably, a thrust bearing is arranged between the telescopic block and the bolt. The structure can avoid rod friction between the telescopic block and the bolt.
Preferably, the brake mechanism further comprises a long rail, a transmission wheel, a centrifugal slider, a sleeve wheel, a locking rack and a brake block, wherein the transmission wheel, the sleeve wheel and the locking gear are respectively and rotatably connected with the support shell; the transmission wheel is in contact with the long rail, a first spring and a chute arranged along the diameter direction of the transmission wheel are arranged on the transmission wheel, the centrifugal slider is in sliding connection with the transmission wheel through the chute, one end of the first spring is connected with the centrifugal slider, the other end of the first spring is connected with the transmission wheel, the sleeve wheel is sleeved on the outer side of the transmission wheel, and inner teeth matched with the centrifugal slider are arranged on the inner side wall of the sleeve wheel; the sleeve wheel is connected with the locking gear, the locking rack is in sliding connection with the support shell, the locking gear is matched with the locking rack, and one end of the locking rack is provided with a first inclined surface; brake block and support shell sliding connection, brake block one end are equipped with the second inclined plane, the other end and the long rail contact of brake block, first inclined plane and the contact of second inclined plane.
Among the above-mentioned technical scheme, the slip direction of locking rack is perpendicular with the slip direction of brake block, the long rail is fixed with the inner wall of elevator well, when elevator stall falls down fast, the drive wheel is rotatory fast, it is rotatory to drive centrifugal slider, centrifugal slider overcomes the elasticity of first spring under the effect of centrifugal force, outwards stretch out, centrifugal slider contacts with the internal tooth on the sleeve wheel, it is rotatory to drive the sleeve wheel, the sleeve wheel further drives the locking gear rotatory, the locking gear drives the slip of locking rack, first inclined plane extrusion second inclined plane on the locking rack, make brake block extrusion long rail, brake the elevator. When the elevator normally goes up and down, the rotating speed of the driving wheel is low, the centrifugal force of the centrifugal slide block cannot overcome the elastic force of the first spring, and the centrifugal slide block cannot drive the sleeve wheel to rotate. According to the technical scheme, the emergency braking effect can be achieved in the stalling and accelerated descending process of the elevator, and the reliability of the elevator is improved; and the whole braking mechanism is realized through a pure mechanical structure, and the emergency braking function can be also realized under the special conditions of elevator power failure or controller failure and the like, so that the safety of the elevator is further ensured. The brake block is provided with a fifth spring, and the brake block retracts when the locking rack does not extrude the brake block.
Preferably, the sleeve gear and the locking gear are connected through a gear reduction mechanism. The structure can play a role in reducing speed and increasing torque.
Preferably, a friction plate is arranged on one side, close to the long rail, of the brake block. The structure can play a better braking effect.
Preferably, the brake mechanism further comprises a pawl and a second spring, wherein the locking gear is provided with a ratchet, one end of the second spring is connected with the support shell, the other end of the second spring is connected with the pawl, one end of the pawl is rotatably connected with the support shell, and the other end of the pawl is in contact with the ratchet. The structure can avoid the reverse rotation of the locking gear and ensure the reliability of emergency braking.
Preferably, a rubber sleeve is arranged outside the transmission wheel. The structure can avoid slipping between the driving wheel and the long rail.
Preferably, the number of the centrifugal sliders is multiple, and the centrifugal sliders are uniformly arranged on the transmission wheel. The structure can avoid slipping between the driving wheel and the long rail.
The invention has the beneficial effects that: (1) the elevator can be stably locked after emergency braking, and the plug pin can be prevented from extending out when the elevator descends at high speed and is not stopped, so that huge impact caused by instant stopping is avoided; (2) the emergency braking function can be realized in the process of accelerating the elevator to descend when the elevator stalls, and the reliability of the elevator is improved; and the whole braking mechanism is realized through a pure mechanical structure, and the emergency braking function can be also realized under the special conditions of elevator power failure or controller failure and the like, so that the safety of the elevator is further ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of example 2;
fig. 3 is a partial structural view of embodiment 2.
In the figure: brake mechanism 1, long rail 1.1, support shell 1.2, through-hole 1.2.1, drive wheel 1.3, spout 1.3.1, centrifugal slider 1.4, sheave 1.5, internal tooth 1.5.1, locking gear 1.6, locking rack 1.7, first inclined plane 1.7.1, brake block 1.8, second inclined plane 1.8.1, first spring 1.9, gear reduction mechanism 1.10, friction disc 1.11, pawl 1.12, locking mechanism 2, bolt 2.1, pivot 2.2, centrifugal lever 2.3, connecting rod 2.4, flexible piece 2.5, third spring 2.6, baffle 2.7, balancing weight 2.8, fourth spring 2.9, footstep bearing 2.10.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1:
as shown in fig. 1, the brake locking mechanism for the emergency state of the elevator comprises a brake mechanism 1 and a locking mechanism 2, wherein the brake mechanism 1 comprises a support shell 1.2 and a locking rack 1.7 for emergency braking; the locking mechanism 2 comprises a bolt 2.1, a rotating shaft 2.2, a centrifugal rod 2.3, a connecting rod 2.4, a telescopic block 2.5, a third spring 2.6 and a baffle 2.7; the rotating shaft 2.2 is connected with the driving wheel 1.3, the rotating shaft 2.2 at one end of the centrifugal rod 2.3 is hinged, the telescopic block 2.5 is sleeved on the rotating shaft 2.2 and is in sliding connection with the rotating shaft 2.2, one end of the third spring 2.6 is connected with the telescopic block 2.5, the other end of the third spring 2.6 is connected with the rotating shaft 2.2, one end of the connecting rod 2.4 is hinged with the telescopic block 2.5, the other end of the connecting rod 2.4 is hinged with the centrifugal rod 2.3, the bolt 2.1 is in sliding connection with the supporting shell 1.2, the supporting shell 1.2 is provided with a through hole 1.2.1, the baffle 2.7 is arranged on the through hole 1.2.1, and the baffle 2.7 is connected with the locking rack 1; the long rail 1.1 is provided with a plurality of clamping grooves matched with the bolts 2.1. A balancing weight 2.8 is arranged at one end of the centrifugal rod 2.3 far away from the rotating shaft 2.2, a fourth spring 2.9 is sleeved outside the bolt 2.1, one end of the fourth spring 2.9 is connected with the bolt 2.1, and the other end of the fourth spring 2.9 is connected with the supporting shell 1.2; the fourth spring 2.9 pushes the bolt 2.1 to one side of the telescopic block 2.5, and the elasticity of the third spring 2.6 is larger than that of the fourth spring 2.9. A thrust bearing 2.10 is arranged between the telescopic block 2.5 and the bolt 2.1.
Example 2:
as shown in fig. 2 and fig. 3, based on embodiment 1, the brake mechanism 1 further includes a long rail 1.1, a transmission wheel 1.3, a centrifugal slider 1.4, a sheave 1.5, a locking gear 1.6, a brake block 1.8, a pawl 1.12 and a second spring, wherein the transmission wheel 1.3, the sheave 1.5 and the locking gear 1.6 are respectively rotatably connected with the support housing 1.2; the transmission wheel 1.3 is in contact with the long rail 1.1, a first spring 1.9 and a chute 1.3.1 arranged along the diameter direction of the transmission wheel 1.3 are arranged on the transmission wheel 1.3, the centrifugal sliders 1.4 are in sliding connection with the transmission wheel 1.3 through the chute 1.3.1, the number of the centrifugal sliders 1.4 is multiple, the centrifugal sliders 1.4 are uniformly arranged on the transmission wheel 1.3, one end of the first spring 1.9 is connected with the centrifugal slider 1.4, the other end of the first spring 1.9 is connected with the transmission wheel 1.3, the sleeve wheel 1.5 is sleeved outside the transmission wheel 1.3, and the inner side wall of the sleeve wheel 1.5 is provided with inner teeth 1.5.1 matched with the centrifugal sliders 1.4; the sleeve wheel 1.5 is connected with the locking gear 1.6 through a gear speed reducing mechanism 1.10, the locking rack 1.7 is connected with the support shell 1.2 in a sliding mode, the locking gear 1.6 is matched with the locking rack 1.7, and a first inclined surface 1.7.1 is arranged at one end of the locking rack 1.7; the brake block 1.8 is connected with the support shell 1.2 in a sliding mode, one end of the brake block 1.8 is provided with a second inclined surface 1.8.1, the other end of the brake block 1.8 is in contact with the long rail 1.1, and the first inclined surface 1.7.1 is in contact with the second inclined surface 1.8.1; one side of the brake block 1.8, which is close to the long rail 1.1, is provided with a friction plate 1.11. The locking gear 1.6 is provided with a ratchet, one end of the second spring is connected with the supporting shell 1.2, the other end of the second spring is connected with the pawl 1.12, one end of the pawl 1.12 is rotatably connected with the supporting shell 1.2, and the other end of the pawl 1.12 is contacted with the ratchet. And a rubber sleeve is arranged on the outer side of the driving wheel 1.3.
In the technical scheme, the sliding direction of the locking rack 1.7 is perpendicular to the sliding direction of the brake block 1.8, the long rail 1.1 is fixed to the inner wall of an elevator hoistway, when an elevator stalls and falls down quickly, the transmission wheel 1.3 rotates quickly to drive the centrifugal slider 1.4 to rotate, the centrifugal slider 1.4 overcomes the elasticity of the first spring 1.9 under the action of centrifugal force and extends outwards, the centrifugal slider 1.4 is in contact with the inner teeth 1.5.1 on the sleeve wheel 1.5 to drive the sleeve wheel 1.5 to rotate, the sleeve wheel 1.5 further drives the locking gear 1.6 to rotate, the locking gear 1.6 drives the locking rack 1.7 to slide, the first inclined surface 1.7.1 on the locking rack 1.7 extrudes the second inclined surface 1.8.1, so that the brake block 1.8 extrudes the long rail 1.1 to brake the elevator. When the elevator normally goes up and down, the rotating speed of the driving wheel 1.3 is slow, the centrifugal force of the centrifugal slide block 1.4 cannot overcome the elastic force of the first spring 1.9, and the centrifugal slide block 1.4 cannot drive the sleeve wheel 1.5 to rotate. According to the technical scheme, the emergency braking effect can be achieved in the stalling and accelerated descending process of the elevator, and the reliability of the elevator is improved; and the whole braking mechanism is realized through a pure mechanical structure, and the emergency braking function can be also realized under the special conditions of elevator power failure or controller failure and the like, so that the safety of the elevator is further ensured. Be equipped with on the brake block 1.8 and set up the fifth spring, when locking rack 1.7 did not extrude brake block 1.8, make brake block 1.8 retract.
The invention has the beneficial effects that: (1) the emergency braking function can be realized in the process of accelerating the elevator to descend when the elevator stalls, and the reliability of the elevator is improved; the whole braking mechanism is realized through a pure mechanical structure, and the emergency braking function can be also realized under the special conditions of elevator power failure or controller failure and the like, so that the safety of the elevator is further ensured; (2) the elevator emergency braking device has the advantages that the elevator can be stably locked after emergency braking, the situation that the elevator descends at high speed and is not braked can be avoided, the bolt stretches out, and huge impact caused by instant braking is avoided.
Claims (9)
1. A brake locking mechanism for an elevator in an emergency state is characterized by comprising a brake mechanism and a locking mechanism, wherein the brake mechanism comprises a support shell and a locking rack for emergency braking; the locking mechanism comprises a bolt, a rotating shaft, a centrifugal rod, a connecting rod, a telescopic block, a third spring and a baffle plate; the rotating shaft is connected with the driving wheel, one end of the centrifugal rod is hinged with the rotating shaft, the telescopic block is sleeved on the rotating shaft and is in sliding connection with the rotating shaft, one end of a third spring is connected with the telescopic block, the other end of the third spring is connected with the rotating shaft, one end of a connecting rod is hinged with the telescopic block, the other end of the connecting rod is hinged with the centrifugal rod, the bolt is in sliding connection with the supporting shell, the supporting shell is provided with a through hole, the baffle is arranged on the through hole, and the baffle is connected with the; the long rail is provided with a plurality of clamping grooves or clamping holes matched with the bolts.
2. The brake locking mechanism for an elevator emergency as claimed in claim 1, wherein the centrifugal lever has a weight at an end thereof remote from the shaft.
3. The brake locking mechanism for the emergency state of the elevator as claimed in claim 1, wherein a fourth spring is sleeved outside the bolt, one end of the fourth spring is connected with the bolt, and the other end of the fourth spring is connected with the supporting shell; the fourth spring pushes the bolt to one side of the telescopic block, and the elasticity of the third spring is larger than that of the fourth spring.
4. The brake locking mechanism for the emergency state of the elevator as claimed in claim 1, 2 or 3, wherein the brake mechanism further comprises a long rail, a transmission wheel, a centrifugal slider, a sleeve wheel, a locking rack and a brake block, the transmission wheel, the sleeve wheel and the locking gear are respectively rotatably connected with the support shell; the transmission wheel is in contact with the long rail, a first spring and a chute arranged along the diameter direction of the transmission wheel are arranged on the transmission wheel, the centrifugal slider is in sliding connection with the transmission wheel through the chute, one end of the first spring is connected with the centrifugal slider, the other end of the first spring is connected with the transmission wheel, the sleeve wheel is sleeved on the outer side of the transmission wheel, and inner teeth matched with the centrifugal slider are arranged on the inner side wall of the sleeve wheel; the sleeve wheel is connected with the locking gear, the locking rack is in sliding connection with the support shell, the locking gear is matched with the locking rack, and one end of the locking rack is provided with a first inclined surface; brake block and support shell sliding connection, brake block one end are equipped with the second inclined plane, the other end and the long rail contact of brake block, first inclined plane and the contact of second inclined plane.
5. The brake lock mechanism for an elevator emergency as set forth in claim 4, wherein the sheave and the locking gear are connected by a gear reduction mechanism.
6. The brake locking mechanism for an elevator emergency as claimed in claim 4, wherein the brake block has a friction plate on a side thereof adjacent to the long rail.
7. The brake locking mechanism for an elevator emergency as claimed in claim 4, wherein the brake mechanism further comprises a pawl and a second spring, the locking gear is provided with a ratchet, one end of the second spring is connected to the support housing, the other end of the second spring is connected to the pawl, one end of the pawl is rotatably connected to the support housing, and the other end of the pawl is in contact with the ratchet.
8. The brake locking mechanism for an elevator emergency as claimed in claim 4, wherein a rubber sleeve is provided outside the driving wheel.
9. The brake locking mechanism for an elevator emergency as claimed in claim 4, wherein the centrifugal slider is provided in plural number, and the plural centrifugal sliders are uniformly provided on the driving wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034712.5A CN112744681B (en) | 2021-01-12 | Braking locking mechanism for elevator in emergency state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034712.5A CN112744681B (en) | 2021-01-12 | Braking locking mechanism for elevator in emergency state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112744681A true CN112744681A (en) | 2021-05-04 |
| CN112744681B CN112744681B (en) | 2024-07-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117661822A (en) * | 2024-02-02 | 2024-03-08 | 新乡学院 | Lifting platform for building construction |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012111071A1 (en) * | 2012-11-16 | 2014-05-22 | Manfred Lienemann | Autonomous safety device for elevator car of elevator system, has brake element that is held at distance from running rail in driving position during normal running of elevator car by actuating element in driving position |
| CN107089610A (en) * | 2017-05-31 | 2017-08-25 | 深圳盛世电梯股份有限公司 | Gradual centrifugal brake |
| CN108217365A (en) * | 2018-01-15 | 2018-06-29 | 李亚恒 | A kind of high rise elevator breaks rope safety guard and method |
| CN110436302A (en) * | 2018-05-02 | 2019-11-12 | 陕西小溪机电科技有限公司 | A kind of towed elevator car guide rail sure brake system |
| CN214692829U (en) * | 2021-01-12 | 2021-11-12 | 菲尼克斯电梯有限公司 | Brake locking mechanism for elevator emergency |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012111071A1 (en) * | 2012-11-16 | 2014-05-22 | Manfred Lienemann | Autonomous safety device for elevator car of elevator system, has brake element that is held at distance from running rail in driving position during normal running of elevator car by actuating element in driving position |
| CN107089610A (en) * | 2017-05-31 | 2017-08-25 | 深圳盛世电梯股份有限公司 | Gradual centrifugal brake |
| CN108217365A (en) * | 2018-01-15 | 2018-06-29 | 李亚恒 | A kind of high rise elevator breaks rope safety guard and method |
| CN110436302A (en) * | 2018-05-02 | 2019-11-12 | 陕西小溪机电科技有限公司 | A kind of towed elevator car guide rail sure brake system |
| CN214692829U (en) * | 2021-01-12 | 2021-11-12 | 菲尼克斯电梯有限公司 | Brake locking mechanism for elevator emergency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117661822A (en) * | 2024-02-02 | 2024-03-08 | 新乡学院 | Lifting platform for building construction |
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