CN113479738B - Self-adaptive relatively constant braking force device - Google Patents
Self-adaptive relatively constant braking force device Download PDFInfo
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- CN113479738B CN113479738B CN202110855143.0A CN202110855143A CN113479738B CN 113479738 B CN113479738 B CN 113479738B CN 202110855143 A CN202110855143 A CN 202110855143A CN 113479738 B CN113479738 B CN 113479738B
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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
- B66B5/18—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
- B66B5/22—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 by means of linearly-movable wedges
Abstract
A self-adaptive relatively constant braking force device comprises a support, a coupling part, a first translation part, a second translation part, a first elastic element, a first control locking plate, a reset spring, a second elastic element, a friction element, a second control locking plate and a control trigger device, wherein the coupling part is vertically arranged outside a first side of the support, the support is internally provided with the first translation part capable of moving vertically, the second elastic element is arranged between the support and the first translation part, the first translation part capable of moving transversely is arranged in the first translation part, the first elastic element is arranged between the first translation part and the second translation part, the support is internally provided with the first control locking plate capable of moving transversely, the second translation part is also provided with the control trigger device capable of rotating around the second translation part, and the first side of the friction element is contacted with the first side of the second translation part and can move vertically.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to a self-adaptive relatively constant braking force device.
Background
The existing emergency braking device has the problem that accidents are caused by friction factors or change of working conditions, because the braking device fixes the positive pressure acting on the mating part during factory adjustment, when the friction coefficient of the existing emergency braking device with the mating part changes, the braking force of the existing emergency braking device cannot be timely adjusted according to the change of the friction factors, and the braking capability is seriously influenced by small changes of the friction factors. Different mating parts processing methods, surface protection, working conditions, processing and manufacturing errors, or influence of external factors such as rust and oil stains, etc., the change of the friction factors has a larger range, and the common braking force device cannot be used for safely braking under all working conditions. However, the braking force is determined by the positive pressure and the friction coefficient, so the technical scheme that the braking device and the matching part automatically adjust the braking force control device along with the change of the friction coefficient to obtain relatively constant braking force is researched and solved, the safety problem is solved essentially, and the braking device has great economic value and social benefit.
Chinese patent application No. 201510537341.7 discloses an apparatus for automatically adjusting braking force, which uses a negative feedback method of braking force machinery to control a positive pressure method, so as to automatically adjust a positive pressure of an elastic element, and obtain a relatively constant braking force. The feedback quantity is adjusted through the angle difference value of the friction element and the angle difference value of the self-adjusting part and the spring, the influence of the processing error of the angle on the feedback quantity is large, and the feedback force is not easy to control, so that the elevator is applicable to various working conditions under the same condition, the P + Q value of the elevator is accurate, the P + Q value can be in a range basically due to the fact that the P + Q value can exist in the elevator design, the range can be enlarged basically, then the weight of the weight block is controlled to be increased or decreased through adjusting the balance coefficient on the site, the weight of the elevator on the site is lighter than the weight of the elevator during design, the range is related to the control of designers, the control on the weight of the elevator is required to be accurate, and the elevator design and application can have certain difficulty in the actual elevator design and application.
Disclosure of Invention
Based on the above, the present invention provides an adaptive relatively constant braking force apparatus, which overcomes the defects of the prior art, and provides a constant braking force by adjusting a braking force control apparatus to trigger the control apparatus to lock the relative position of a friction element and a translation member after a preset braking force is reached, so that an elastic element providing a positive pressure is not deformed any more, and the braking force is constant.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a self-adaptive relatively-constant braking force device comprises a support, a coupling part, a first translation part, a second translation part, a first elastic element, a first control locking plate, a reset spring, a second elastic element, a friction element, a second control locking plate and a control trigger device, wherein the coupling part is vertically arranged outside a first side of the support;
in the upward movement process of the friction element, the friction element and the second translation piece can generate transverse and vertical relative movement, so that the first elastic element is pushed to deform to generate positive pressure; when the control trigger device touches the bracket, the first control locking plate is pushed to move transversely relative to the second translation piece, the first control locking plate and the second control locking plate are contacted and self-locked, the friction element and the second translation piece are relatively static, the first elastic element is not further deformed, and the positive pressure acting on the mating piece is kept unchanged.
Preferably, the first side of the friction element is in the shape of an inclined plane, the angle is theta, the second side of the friction element is in the shape of a vertical plane and is parallel to the plane of the mating part, the first side of the second translation part is in the shape of an inclined plane and is parallel to the first side of the friction element, and when the friction element moves vertically, the first translation part can be pushed to move vertically through the inclined plane and the second translation part can be pushed to move transversely.
Preferably, the first control locking plate can move transversely along the support, the vertical position of the first control locking plate is relatively unchanged with the support, the transverse position of the first control locking plate is relatively unchanged with the second translation piece, the relative position of the first control locking plate and the second translation piece can be controlled through a limit stop, the limit stop is arranged on the first translation piece, the first control locking plate is further provided with the return spring, and the return spring is used for restoring the relative position of the first control locking plate and the second translation piece.
Preferably, the return spring is connected with the second translation member, the first translation member or the bracket, and the return spring is used for providing a force for keeping the first control locking plate tightly attached to the limit stop when the second translation member moves left and right.
Preferably, the elastic coefficient of the first elastic element is larger than that of the second elastic element, and the first elastic element and the second elastic element adopt U-shaped springs, disc springs, flat springs, spiral springs, hydraulic springs, gas springs or compression bar springs.
Preferably, the side of the friction element in contact with the second translator is provided with rows of balls for reducing the coefficient of friction.
Preferably, when the friction element moves vertically to drive the first translation part to compress the second elastic element and the first translation part is compressed to a set height, the control trigger device acts to push the first control locking plate to move transversely so that the first control locking plate and the second translation part move transversely relative to each other, the first control locking plate and the second control locking plate are in contact and self-lock, and the control trigger device adopts a swing rod mechanism, a cam mechanism, a hydraulic mechanism and the like.
Preferably, the first control locking plate and the second control locking plate are self-locked by triangular tooth-shaped contact or self-locked by contact of an element with an ultra-large friction coefficient.
When the actual friction coefficient mu is equal to the set minimum friction coefficient mu 0, a positive pressure F is generated when the first elastic element deforms Δ W1 S0 At this time, the friction force is F S0 * Mu 0 is equal to a set F0, according to a mechanical balance relationship, the deformation of the second elastic element is delta H1, the trigger control device drives the first control locking plate to move towards the direction of the second control locking plate, as the trigger control device starts the process from action to locking, the vertical stroke of the second control locking plate (friction element) and the first control locking plate is L, the friction element still moves relative to the second translation element, so that the positive pressure is increased to enable the friction force to be larger than F0, the first translation element can continue to push the second elastic element until the self-locking of the first control locking plate and the second control locking plate is completed, the positive pressure of the deformation delta W2 of the first elastic element is not increased, at this time, the deformation of the second elastic element is delta H2 according to the mechanical balance relationship, and the final braking force is K2 delta H2. At this time, the deformation amount Δ W2 of the first elastic element is the minimum deformation requirement of the first elastic element model selection.
When the actual friction coefficient mu is equal to the set maximum friction coefficient mu 1, a positive pressure F is generated when the first elastic element is deformed Δ W1 S0 At this time, the friction force is F S0 * Mu 0 is equal to the set F0, the deformation of the second elastic element is delta H1 according to the mechanical balance relation, and the control device is triggered to push the first control locking plate to the second control locking plateAnd (3) direction movement, wherein in the process from the start of the trigger control device to the locking, the stroke of the second control locking plate (friction element) in the vertical direction with the first control locking plate is L, the friction element still moves relative to the second translation piece, so that the positive pressure is increased to enable the friction force to be larger than F0, the first translation piece can continuously push and press the second elastic element until the self-locking of the first control locking plate and the second control locking plate is completed, the positive pressure is not increased when the first elastic element deforms delta W2, the deformation amount of the second elastic element is delta H2 at the moment according to the mechanical balance relation, and the final braking force is K2 x delta H2. At this time, the deformation amount Δ H2 of the second elastic element is the minimum deformation requirement of the second elastic element model selection.
Preferably, when the actual friction coefficient μ triggers the control device braking force set value F0, the actual balanced force is F = F0+ Δ F according to the force analysis calculation. Δ F is related to μ and L, and when the range of variation of μ is determined and the value of L is determined (assuming 2.5 mm), the range of variation of the force F after actual balancing can be determined, which is relatively small and the braking force is considered relatively constant.
Compared with the prior art, the invention has the following beneficial effects:
the self-adaptive relatively constant braking force device provided by the invention has the advantages that the braking force can be kept in a relatively constant range when the friction coefficient mu changes, the safety and the reliability of the braking device under the working condition are ensured, the safety problem is solved essentially, the application range is greatly improved, and the self-adaptive relatively constant braking force device has great economic value and social benefit.
Drawings
In order to more clearly illustrate the embodiments of the present 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 present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an adaptive relatively constant braking force apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of components of an adaptive relatively constant braking force device according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of the position of a friction element in contact with a mating part of the device according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the equilibrium position of the device according to the embodiment of the present invention after the device reaches the set braking force;
FIG. 5 is a schematic diagram of the equilibrium position after the final braking force is achieved by the apparatus of the present invention;
FIG. 6 is a table of parameters for the stress balance of the apparatus according to the embodiment of the present invention;
FIG. 7 is a force balance line diagram of an apparatus according to an embodiment of the present invention;
fig. 8 is a line diagram showing a change in braking force/deceleration of the apparatus according to the embodiment of the present invention.
In the figure: 100. the mechanical locking device comprises a bracket, 110, a cushion block, 200, a second elastic element, 300, a first translation piece, 310, a first translation piece bracket, 320, a second translation piece, 321, a limiting block, 330, a first elastic element, 340, a control trigger device, 341, a control device rotating shaft, 342, a control device push rod, 400, a first control locking plate return spring, 500, a first control locking plate, 600, a ball row, 710, a friction element, 720, a second control locking plate and 800, a coupling piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an adaptive relatively constant braking force apparatus includes: the first control locking plate 500 and the second control locking plate 320 are kept relatively unchanged in transverse position through a limiting block 321 of the first control locking plate 500, the control trigger device 320 is further provided with a control trigger device 320 capable of rotating around the second translation piece 320, the control trigger device 340 can rotate around the control locking plate 320 when the control locking plate 500 and the second translation piece 320 move relatively, the control locking plate 320 and the second control locking plate 320 move relatively, the friction element 710 can push the control locking plate 500 and the second control locking plate 720 when the control locking plate 500 and the second translation piece 320 move relatively, and the friction element 720 and the control trigger device 710 can move relatively and are used for enabling the control locking plate 500 and the second translation piece 320 to move relatively and return to the friction element 320, so that the control locking plate 500 and the second translation piece 320 move relatively, the control locking plate 500 and the friction element 320 move relatively, and the friction element 320 can return to the friction element 400 and the friction element 320, and the friction element 710 can move relatively.
As shown in fig. 1, the first side of the friction element 710 is inclined at an angle θ, the second side is vertical and parallel to the plane of the mating member 800, and the first side of the second translation member 320 is inclined and parallel to the first side of the friction element 710. When the friction member 710 moves vertically, the second translation member 320 can be pushed to move laterally by the inclined surface.
As shown in fig. 1, the return spring 400 may be connected to the second translation member 320, the first translation member 300 or the bracket 100, as long as a certain force is provided to the first control lock plate 500, so that it can keep close contact with the limit stop when the second translation member 320 moves left and right.
As shown in fig. 1, the first elastic element may be an elastic element K1 with a large elastic coefficient, the second elastic element 200 may be an elastic element K2 with a small elastic coefficient, and the elastic element may be a U-shaped spring, a disc spring, a flat spring, a coil spring, a hydraulic spring, a gas spring, a strut spring, or the like.
As shown in fig. 1, a first side of the friction member 710 contacts and moves relative to a first side of the second translation member 320, and a ball row 600 is added in the middle to reduce the coefficient of friction.
As shown in fig. 1, when the friction element 710 moves upward and the friction element 710 has not touched the mating part 800, the first control lock plate 500 is not in contact with the second control lock plate 720, the friction element 710 and the second translational member 320 can move transversely and vertically relative to each other, but only the friction element 710 approaches the mating part 800 transversely, and the first elastic element is not pushed to deform to generate a positive pressure.
As shown in fig. 3, when the friction element 710 continues to move upwards, and the friction element 710 touches the mating part 800 and the control trigger device 340 does not touch the bracket 100, the first control lock plate 500 does not touch the second control lock plate 720, the friction element 710 and the second translation part 320 can move transversely and vertically relative to each other, and the friction element 710 touches the mating part 800, so that the first elastic element is pushed to deform to generate a positive pressure.
As shown in fig. 4, when the control trigger device 340 touches the bracket 100, the first control locking plate 500 is pushed to move laterally relative to the second translating member 320, at this time, the tooth-shaped self-locking teeth of the first control locking plate 500 and the second control locking plate 720 have a distance of L to contact and self-lock, the range of L is (0, L0), the friction element 710 and the second translating member 320 can continuously generate lateral and vertical relative movement, the first elastic element deforms to generate positive pressure, and the first translating member 300 continuously compresses the second elastic element 200 until the force is balanced.
As shown in fig. 5, when the vertical relative movement distance of the first control lock plate 500 and the second control lock plate 720 reaches L, the friction member 710 and the second translating member 320 are relatively stationary, so that the first elastic member is not further deformed, and the positive pressure acting on the mating member 800 is kept constant, so that the braking force reaches a fixed value and is not changed.
As shown in fig. 4, in the present invention, when the deformation of the second elastic element 200 is Δ H1, the compression force is a set value F0, and at this time, the control trigger device 340 just touches the bracket 100, and when the first translating element 300 continues to move upward, the control device push rod 342 rotates around the control device rotating shaft 341 to push the first control locking plate 500 to move toward the second control locking plate 720.
When the actual friction coefficient mu is equal to the set minimum friction coefficient mu 0, a positive pressure F is generated when the first elastic element is deformed Δ W1 S0 At this time, the friction force is F S0 * μ 0 is equal to F0, and according to a mechanical balance relationship, the deformation amount of the second elastic element 200 is Δ H1, as shown in fig. 4, the control device is triggered to push the first control locking plate 500 to move toward the second control locking plate 720, since the control device is triggered to start the process from the operation to the locking, the stroke of the second control locking plate 720 (the friction element 710) and the first control locking plate 500 in the vertical direction is L, the friction element 710 still moves relative to the second translator 320, so that the positive pressure increases and the friction force is greater than F0, the first translator 300 will also continue to push the second elastic element 200 until the self-locking of the first control locking plate 500 and the second control locking plate 720 is completed, the positive pressure of the first elastic element deformation Δ W2 will not increase, and at this time, according to a mechanical balance relationship, the deformation amount of the second elastic element 200 is Δ H2, as shown in fig. 5, the final braking force is K2 × Δ H2. At this time, the deformation amount Δ W2 of the first elastic element is the minimum deformation requirement of the first elastic element model selection.
When the actual friction coefficient mu is equal to the set maximum friction coefficient mu 1, a positive pressure F is generated when the first elastic element is deformed Δ W1 S0 At this time, the friction force is F S0 * μ 0 is equal to F0, and according to a mechanical balance relationship, the deformation amount of the second elastic element 200 is Δ H1, as shown in fig. 4, the control device is triggered to push the first control locking plate 500 to move toward the second control locking plate 720, since the control device is triggered to start the process from the operation to the locking, the stroke of the second control locking plate 720 (the friction element 710) and the first control locking plate 500 in the vertical direction is L, the friction element 710 still moves relative to the second translator 320, so that the positive pressure increases and the friction force is greater than F0, the first translator 300 will also continue to push the second elastic element 200 until the self-locking of the first control locking plate 500 and the second control locking plate 720 is completed, the positive pressure of the first elastic element deformation Δ W2 will not increase, and at this time, according to a mechanical balance relationship, the deformation amount of the second elastic element 200 is Δ H2, as shown in fig. 5, the final braking force is K2 × Δ H2. At this time the secondThe deformation Δ H2 of the elastic element 200 is the minimum deformation requirement for the type selection of the second elastic element 200.
As shown in fig. 6, preferably, when the actual friction coefficient μ changes within a range of [ 0.3,1 ] and the braking force setting value of the trigger control device is F0=1200Kg, θ is 10 degrees, L is determined to be 2.5mm, and the remaining parameter values are shown in fig. 6, the actual balanced force is F calculated according to the force analysis, and the change range of the actual balanced force F can be determined by calculating the parameter change values respectively, and as shown in fig. 7, the change range is relatively small, and when L0=2.5, the braking force is considered to be relatively constant because the F range is [ 1235,1244 ] Kg.
As shown in fig. 8, preferably, when the variation range of L is (0,2.5) under different operating conditions, the range of P + Q is [ 2500, 3500 ] Kg, the deceleration variation of the braking force is (0.37,0.99), so that the safety braking under different operating conditions can be realized, the range of P + Q is large, and the type of the safety tongs can be easily selected during design.
According to the invention, the braking force control device is adjusted, so that after the preset braking force is reached, the control device is triggered to lock the relative positions of the friction element and the translation piece, and thus the elastic element providing positive pressure is not deformed any more, and the constant braking force is reached. The preset braking force is set through the elastic element and is not influenced by the change of the friction coefficient, so the preset braking force is not influenced when the friction coefficient is changed, but the final braking force and the preset braking force have certain amplification along with the change of the friction coefficient because the relative position of the friction element and the translation piece is locked by triggering the control device to act to the control device so that delay exists, the amplification can be considered to be relatively constant, after the relative position of the friction element and the translation piece is locked to be balanced finally, the braking force is equal to the preset braking force plus the minimum friction coefficient balance change force plus the actual friction coefficient relative minimum friction coefficient balance change force, the preset braking force and the minimum friction coefficient balance change force are constant values, the actual friction coefficient relative minimum friction coefficient balance change force has small change, and the relatively constant braking force is obtained, so the safety and reliability of the braking device under different working conditions are ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The self-adaptive relatively-constant braking force device is characterized by comprising a support (100), a coupler (800), a first translation piece (300), a second translation piece (320), a first elastic element (330), a first control locking plate (500), a reset spring (400), a second elastic element (200), a friction element (710), a second control locking plate (720) and a control trigger device (340), wherein the coupler (800) is vertically arranged outside the first side of the support (100), the support (100) is internally provided with the first translation piece (300) capable of vertically moving, the second elastic element (200) is arranged between the support (100) and the first translation piece (300), the second elastic element (200) has slight pre-pressure, the first translation piece (320) capable of transversely moving is arranged in the first translation piece (300), the first elastic element (330) is arranged between the first translation piece (300) and the second translation piece (320), the support (100) is also internally provided with the first control locking plate (500) capable of transversely moving, the second translation piece (320) is further provided with the first control locking plate (500) capable of transversely moving, the second translation piece (320) rotates around the second translation piece (320), and the second translation piece (320) can move relative to one side of the control trigger device (710);
in the upward movement process of the friction element (710), the friction element (710) and the second translation piece (320) can generate transverse and vertical relative movement, so that the first elastic element (330) is pushed to deform to generate positive pressure; when the control trigger device (340) touches the bracket (100), the first control locking plate (500) is pushed to move transversely relative to the second translation piece (320), the first control locking plate (500) and the second control locking plate (720) are contacted and self-locked, the friction element (710) and the second translation piece (320) are relatively static, the first elastic element (330) is not further deformed, and the positive pressure acting on the mating piece (800) is kept unchanged.
2. An adaptive relatively constant braking force apparatus according to claim 1, wherein the friction member (710) has a first side with an inclined surface and an angle θ, a second side with a vertical surface parallel to the plane of the counterpart member (800), and a first side with an inclined surface and a second side with an inclined surface (320) parallel to the first side of the friction member (710), and when the friction member (710) moves vertically, the first side of the friction member (300) is pushed to move vertically and the second side of the friction member (320) is pushed to move laterally.
3. An adaptive relatively constant braking force device according to claim 2, characterized in that the first control lock plate (500) can move transversely along the support (100), the vertical position of the first control lock plate is relatively unchanged from the support (100), the transverse position of the first control lock plate (500) and the second translational member (320) is relatively unchanged, and the relative position can be controlled by a limit stop (321), the limit stop (321) is arranged on the second translational member (320), and a return spring (400) is further arranged on the first control lock plate (500), and the return spring (400) is used for restoring the relative position of the first control lock plate (500) and the second translational member (320).
4. An adaptive relatively constant braking force apparatus according to claim 3, wherein the return spring (400) is connected to the second translator (320), the first translator (300) or the bracket (100), the return spring (400) being adapted to provide a force to keep the first control lock plate (500) in close contact with the limit stop (321) when the second translator (320) moves left and right.
5. An adaptive relatively constant braking force apparatus according to claim 4, wherein the first elastic element (330) and the second elastic element (200) are U-shaped springs, disc springs, flat springs, coil springs, hydraulic pressure, gas springs or strut springs.
6. An adaptive relatively constant braking force apparatus according to claim 5, characterized in that the side of the friction member (710) in contact with the second translator (320) is provided with rows of balls (600) for reducing the coefficient of friction.
7. An adaptive relatively constant braking force device according to claim 6, wherein when the friction element (710) moves vertically to drive the first translational member (300) to compress the second elastic element (200), and when the first translational member (300) is compressed to a set height, the control trigger device (340) acts to push the first control locking plate (500) to move transversely, so that the first control locking plate and the second translational member (320) move transversely, the first control locking plate (500) and the second control locking plate (720) are contacted and self-locked, and the control trigger device adopts a rocker mechanism, a cam mechanism or a hydraulic mechanism.
8. An adaptive relatively constant braking force apparatus according to claim 7, wherein the first control lock plate (500) and the second control lock plate (720) are self-locking by means of a delta tooth profile contact or self-locking by means of a friction coefficient element contact.
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| CN202110855143.0A CN113479738B (en) | 2021-07-26 | 2021-07-26 | Self-adaptive relatively constant braking force device |
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| CN202110855143.0A CN113479738B (en) | 2021-07-26 | 2021-07-26 | Self-adaptive relatively constant braking force device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001098193A1 (en) * | 2000-06-22 | 2001-12-27 | Inventio Ag | Brake arresting device with adaptable brake force for a lift |
| MY143851A (en) * | 2006-12-05 | 2011-07-15 | Inventio Ag | Braking device for holding and braking a lift cabin in a lift facility |
| DE602007010410D1 (en) * | 2007-01-08 | 2010-12-23 | Flotation device for the correct clamping of a life protection device | |
| JP6602662B2 (en) * | 2015-12-17 | 2019-11-06 | 株式会社日立製作所 | Emergency stop device |
| CN109693987B (en) * | 2017-10-23 | 2020-12-22 | 上海三菱电梯有限公司 | Bidirectional safety brake device for elevator |
| CN110194402B (en) * | 2018-02-27 | 2021-03-16 | 上海三菱电梯有限公司 | Elevator safety device |
| ES2821007B2 (en) * | 2019-09-06 | 2022-02-21 | Orona S Coop | Electromechanical parachute device for lifting devices |
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