CN116281708B - Traction type elevator brake with micro-elliptical elastic deformation - Google Patents
Traction type elevator brake with micro-elliptical elastic deformation Download PDFInfo
- Publication number
- CN116281708B CN116281708B CN202310311307.2A CN202310311307A CN116281708B CN 116281708 B CN116281708 B CN 116281708B CN 202310311307 A CN202310311307 A CN 202310311307A CN 116281708 B CN116281708 B CN 116281708B
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- Prior art keywords
- brake
- wall
- chain plate
- chain
- wheel
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- 230000005489 elastic deformation Effects 0.000 title abstract description 8
- 229920001971 elastomer Polymers 0.000 claims description 29
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 4
- 230000008878 coupling Effects 0.000 description 13
- 238000010168 coupling process Methods 0.000 description 13
- 238000005859 coupling reaction Methods 0.000 description 13
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004308 accommodation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 108700041286 delta Proteins 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
- B66D5/08—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying blocks or shoes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/30—Operating devices electrical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/10—Drums for externally- or internally-engaging brakes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Braking Arrangements (AREA)
Abstract
The application discloses a traction type elevator brake with micro-elliptical elastic deformation, which comprises two braking arms, wherein the two braking arms are oppositely arranged and move in opposite directions through a driving piece; the brake shoe assembly is fixed on the inner wall surface of the brake arm and is matched with the arc-shaped inner wall surface of the brake arm; the brake wheel is arranged between the two brake arms, the outer wall of the brake wheel is sleeved and connected with a contact layer which can generate small deformation, the outer surface of the contact layer is provided with a chain plate ring which deforms through the deformation of the contact layer, and the brake shoe assembly is contacted with the outer wall surface of the chain plate ring near the contact end of the brake wheel. The application can improve the braking capacity of the elevator brake and ensure the operation safety of the elevator.
Description
Technical Field
The application belongs to the technical field of elevator brakes, and particularly relates to a traction type elevator brake with micro-elliptical elastic deformation.
Background
The elevator is frequently started and stopped in daily use, so that the safety problem of the traction machine brake is critical. The existing elevator traction machine brake generally adopts a drum type electromagnetic brake and is characterized in that brake blocks on brake arms are used for wrapping a traction machine to brake greatly, and after the brake blocks are electrified, the brake blocks are pushed open to release the brake.
The accident of traction type elevator usually is caused by insufficient traction force, so that the applicant concentrates the gravity center on how to improve the use efficiency of the electromagnetic coil to increase the braking force, as disclosed in patent number CN203143996U of elevator traction machine brake, and the applicant reduces the magnetic field loss generated by the coil assembly by optimizing the armature shape of the electromagnetic coil to enhance the braking force of the traction type elevator, but the effect of improving the traction force by changing the electromagnetic coil assembly is not obvious, the difficulty is high, the manufacturing cost is increased, and the structure is complex. Therefore, by changing an optimization scheme to design a novel traction type elevator brake, the improvement of the safety performance of the novel traction type elevator brake is a problem to be solved urgently at present.
Disclosure of Invention
In order to solve the technical problems, the application provides a traction type elevator brake with micro-elliptical elastic deformation, which can improve the braking capacity of the elevator brake and ensure the operation safety of an elevator.
In order to achieve the above object, the present application provides a traction type elevator brake having a micro-elliptical elastic deformation, comprising,
the two brake arms are oppositely arranged and move in opposite directions through the driving piece;
the brake shoe assembly is fixed on the inner wall surface of the brake arm and is matched with the arc-shaped inner wall surface of the brake arm;
the brake wheel is arranged between the two brake arms, a contact layer capable of generating small deformation is sleeved on the outer wall of the brake wheel, a chain plate ring capable of generating deformation through deformation of the contact layer is arranged on the outer surface of the contact layer, and the brake shoe assembly is close to the contact end of the brake wheel and is in contact with the outer wall surface of the chain plate ring.
Further, the contact layer is a connecting rubber layer sleeved and fixed on the outer wall of the brake wheel, and the outer wall of the connecting rubber layer is fixedly adhered to the inner wall of the chain plate ring.
Further, the chain plate ring comprises a plurality of chain plates, the plurality of chain plates are connected in a matched mode to form the chain plate ring, and the close ends of two adjacent chain plates are hinged.
Further, two side walls of the chain plate are fixedly connected with a plurality of bulges which are arranged at equal intervals respectively, the bulges on two sides of one chain plate are arranged in a staggered mode, a gap formed between every two adjacent bulges on one side wall of the chain plate is used for the bulges on the other adjacent chain plate to extend in, pin holes are formed in the side walls of the bulges, pin shafts are arranged on all bulges on the side walls of the adjacent chain plates in a penetrating mode, and the adjacent chain plates are hinged through the pin shafts.
Further, the link joint includes a plurality of locating link plates and a plurality of connection link plates, is provided with a plurality of between the adjacent two the location link plate is close to the rigid coupling has a plurality of reference columns on the lateral wall of hookup rubber layer, the hookup rubber layer surface seted up with the locating hole that the reference column matches, the reference column stretches into in the locating hole and both are glued fixedly.
Further, the brake shoe assembly comprises a brake shoe attached to the inner wall of the brake arm, two brake pads arranged up and down are fixed on one side, close to the brake wheel, of the brake shoe, and the inner wall of the brake pad is in contact with the outer wall of the chain plate.
Further, the brake wheel is a rigid wheel.
Further, the coupling rubber layer is polyurethane rubber.
Further, the driving piece comprises a fixed base, an electromagnetic coil is fixedly connected to the fixed base, a push rod bolt and a spring accommodating rod are fixedly connected to two side walls of the fixed base respectively, and the push rod bolt and the spring accommodating rod penetrate through the brake arm and are in sliding connection with the brake arm;
the one end rigid coupling that the ejector pin bolt kept away from solenoid has the stop nut, the cover is equipped with brake spring on the spring accommodation pole, the spring accommodation pole kept away from solenoid's one end rigid coupling has the spring gasket, brake spring both ends respectively with spring gasket with brake arm outer wall rigid coupling.
Compared with the prior art, the application has the following advantages and technical effects:
the elevator brake starts from the direct action between the brake shoe and the brake wheel, and a circle of chain plate ring capable of carrying out tiny deformation is arranged on the surface of the brake wheel, so that the contact area between the brake shoe and the chain plate ring is increased, and the chain plate ring is changed into a non-uniform circle by utilizing the mutual contact of the brake shoe and the brake wheel in the braking process, so that the rotation resistance of the brake wheel is greatly increased, and the braking capability and the safety performance of the traction elevator are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a perspective view of a brake;
FIG. 2 is a perspective view of a link plate ring;
FIG. 3 is an exploded view of the connecting relationship of the positioning link plate and the connecting link plate;
FIG. 4 is a schematic structural view of the brake shoe assembly in an untouched condition of the link plate ring;
FIG. 5 is a schematic view of the construction of the brake shoe assembly in contact with the link plate ring;
wherein, 1, a brake arm; 2. a brake pad; 3. a brake shoe; 4. a brake wheel; 5. a coupling rubber layer; 6. a link plate; 61. positioning a chain plate; 62. connecting a chain plate; 7. a push rod bolt; 8. a stop nut; 9. a fixed base; 10. an electromagnetic coil; 11. a brake spring; 12. a spring washer; 13. a protrusion; 14. a pin hole; 15. and positioning columns.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 5, the present application provides a traction type elevator brake with micro-elliptical elastic deformation, comprising two brake arms 1, wherein the two brake arms 1 are oppositely arranged and move towards each other through a driving member; the brake shoe assembly is fixed on the inner wall surface of the brake arm 1 and is matched with the arc-shaped inner wall surface of the brake arm 1; the brake wheel 4 is arranged between the two brake arms 1, a contact layer capable of generating small deformation is sleeved on the outer wall of the brake wheel 4, a chain plate ring which is deformed through the deformation of the contact layer is arranged on the outer surface of the contact layer, and the brake shoe assembly is contacted with the outer wall surface of the chain plate ring near the contact end of the brake wheel 4.
The two brake arms 1 move in opposite directions through the driving piece, the brake wheel 4 is clamped and fixed and released, when braking is carried out, the brake shoe component is contacted with the chain plate ring and extrudes the chain plate ring, because the contact layer arranged in the brake shoe component can generate smaller deformation, the contact layer deforms under the action of external force, and meanwhile, the chain plate ring is deformed corresponding to the contact layer, so that the chain plate ring deforms into a non-uniform circular chain plate ring capable of increasing braking force, until the braking process is finished, the brake shoe component is not contacted with the chain plate ring any more, and the contact layer is restored to the original state, so that the chain plate ring is restored to the original state.
In a further optimized scheme, referring to fig. 1, the contact layer is a connecting rubber layer 5 sleeved and fixed on the outer wall of the brake wheel 4, and the outer wall of the connecting rubber layer 5 is fixedly adhered to the inner wall of the chain plate ring.
The coupling rubber layer 5 formed by polyurethane rubber has a certain elastic deformation capability as a high-strength flexible coupling material, and has the advantages of excellent tensile strength, tearing strength, wear resistance, oil resistance and the like.
Meanwhile, the outer wall of the connecting rubber layer 5 is required to be connected with the inner wall of the chain plate ring, so that the connecting rubber layer 5 can be fed back to the chain plate ring after being deformed.
Further optimizing scheme, referring to fig. 2, the chain plate ring comprises a plurality of chain plates 6, the plurality of chain plates 6 are connected and matched to form the chain plate ring, and the close ends of two adjacent chain plates 6 are hinged.
It can be understood that two adjacent chain plates 6 are hinged, and a plurality of chain plates 6 are matched to form a circular chain plate ring under the support of the inner connecting rubber layer 5, and when the connecting rubber layer 5 is deformed, the chain plates 6 can quickly react and generate relative movement.
Further optimizing scheme, referring to fig. 2 and 3, two side walls of the chain plate 6 are fixedly connected with a plurality of protrusions 13 which are arranged at equal intervals respectively, the protrusions 13 on two sides of one chain plate 6 are arranged in a staggered mode, a gap formed between two adjacent protrusions 13 on one side wall of one chain plate 6 is used for extending in the protrusions 13 on the other adjacent chain plate 6, pin holes 14 are formed in the side wall of each protrusion 13, pin shafts are arranged on all protrusions 13 on the side walls of the two adjacent chain plates 6 in a penetrating mode, and the two adjacent chain plates 6 are hinged through the pin shafts.
It can be understood that two other chain plates 6 are arranged on two sides of each chain plate 6, and the side walls of the adjacent chain plates 6 can be mutually accommodated and penetrate through the same pin hole through the dislocation arrangement of the protrusions 13, so that the mutual hinging of the adjacent chain plates 6 can be realized.
Further, the two sides of each chain plate 6 are preferably arranged in an arc shape, namely, the chain plate with small radian is designed, so that the aim of densifying the chain plate is fulfilled.
Further, the inner side surface of the chain plate 6 is fixedly connected with a plurality of reinforcing ribs. To improve the strength of the link plate 6.
Further, the link plate 6 and the protrusion 13 are integrally formed, which is convenient for mass production and ensures the use strength.
Further optimizing scheme, link joint 6 includes a plurality of locating link plates 61 and a plurality of link joint 62, is provided with a plurality of link joint 62 between two adjacent locating link plates 61, and the rigid coupling has a plurality of reference columns 15 on the lateral wall that locating link plate 61 is close to the hookup rubber layer 5, and the locating hole that matches with reference column 15 has been seted up on hookup rubber layer 5 surface, and reference column 15 stretches into in the locating hole and both are glued fixedly.
The difference between the positioning link plate 61 and the connecting link plate 62 is that a plurality of positioning posts 15 are arranged on the positioning link plate 61, and the positioning link plate 61 and the outer surface of the connecting rubber layer 5 are fixed by inserting the positioning posts 15 into the positioning holes, so that the whole link plate ring and the connecting rubber layer 5 are connected.
In one embodiment of the present application, the positioning link plates 61 are provided with four, and the four positioning link plates 61 are uniformly distributed, and simultaneously, three positioning holes are uniformly distributed in four directions up, down, left and right on the surface of the coupling rubber layer 5 for accommodating the positioning columns 15.
Alternatively, the positioning link plates 61 are provided with five, six, etc., and it is necessary to ensure uniform distribution thereof.
According to a further optimization scheme, the brake shoe assembly comprises a brake shoe 3 attached to and fixed on the inner wall of the brake arm 1, two brake pads 2 which are arranged up and down are fixed on one side, close to the brake wheel 4, of the brake shoe 3, and the inner wall of each brake pad 2 is in contact with the outer wall of the chain plate 6.
The inner wall of the brake arm 1 is used for fixing the brake shoe 3, and the brake lining 2 is fixed by the brake shoe 3.
In a further optimized scheme, the brake wheel 4 is a rigid wheel. The steel body wheel has higher hardness and does not deform.
In a further optimized scheme, the coupling rubber layer 5 is polyurethane rubber.
In one embodiment of the present application, the coupling rubber layer 5 has a thickness of 20mm and the link plate ring has a thickness of 10mm, and the coupling rubber layer 5 has the same width, the link plate 6 has the same width, the rigid body wheel has the same thickness, and the brake shoe 3 has the same width.
In a further optimized scheme, the driving piece comprises a fixed base 9, an electromagnetic coil 10 is fixedly connected to the fixed base 9, a push rod bolt 7 and a spring accommodating rod are fixedly connected to two side walls of the fixed base 9 respectively, and the push rod bolt 7 and the spring accommodating rod penetrate through the brake arm 1 and are in sliding connection with the brake arm 1;
the end of the ejector rod bolt 7, which is far away from the electromagnetic coil 10, is fixedly connected with a stop nut 8, a brake spring 11 is sleeved on the spring accommodating rod, the end of the spring accommodating rod, which is far away from the electromagnetic coil 10, is fixedly connected with a spring gasket 12, and two ends of the brake spring 11 are fixedly connected with the spring gasket 12 and the outer wall of the brake arm 1 respectively.
It can be understood that the fixed base 9 is used for supporting the electromagnetic coil 10 and the brake arms 1, and the working mode is that the electromagnetic coil 10 pushes the two brake arms 1 to be far away from and compress the brake spring 11, so that the extrusion of the brake wheel 4 is released, the electromagnetic coil 10 is powered off, the brake spring 11 is reset, and the two brake arms 1 are close to each other and extrude the brake wheel 4.
Wherein, set up the spring spacer 12 and carry out the location to the one end of spring spacer 12, set up stop nut 8 and avoid braking arm 1 to break away from ejector pin bolt 7.
Specifically, referring to fig. 4 and 5, when the elevator needs to stop, the electromagnetic coil 10 is powered off, the magnetic force generated by the electromagnetic coil rapidly disappears, the brake arm 1 is rapidly reset through the ejector rod bolt 7 under the action of the brake spring 11, so that the brake shoe 3 is clamped and contacts with a chain plate ring formed by the chain plates 6, under the action of the clamping force of the shoe 3 and the brake pad 2, the connecting rubber layer 5 in the middle layer elastically deforms, the chain plates 6 relatively rotate, the whole chain plate ring correspondingly deforms along with the connecting rubber layer 5, the original diameter D is reduced to D-delta 2 in the horizontal direction, the original diameter D is increased to D+delta 1 in the vertical direction, and the non-uniform circular chain plate ring for increasing the braking force is formed until the braking process is finished. When the elevator needs to be started, the electromagnetic coil 10 is electrified to generate magnetic force to drive the brake arm 1 to enable the brake spring 11 to be acted, the brake shoe 3 is opened to be separated from the chain plate ring, the chain plate ring is restored to a regular circle concentric with the rigid wheel along with the restoring process of the connecting rubber layer 5, the braking force of the elevator is disappeared, and the elevator continues to normally run.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (5)
1. A micro-elliptical elastically deformed traction type elevator brake, which is characterized in that: comprising the steps of (a) a step of,
the two brake arms (1) are oppositely arranged and move in opposite directions through a driving piece;
the brake shoe assembly is fixed on the inner wall surface of the brake arm (1) and is matched with the arc-shaped inner wall surface of the brake arm (1);
the brake wheel (4) is arranged between the two brake arms (1), a contact layer capable of generating small deformation is sleeved on the outer wall of the brake wheel (4), a chain plate ring which is deformed through the deformation of the contact layer is arranged on the outer surface of the contact layer, and the brake shoe assembly is contacted with the outer wall surface of the chain plate ring near the contact end of the brake wheel (4);
the contact layer is a connecting rubber layer (5) sleeved and fixed on the outer wall of the brake wheel (4), and the outer wall of the connecting rubber layer (5) is fixedly adhered to the inner wall of the chain plate ring;
the chain plate ring comprises a plurality of chain plates (6), the chain plates (6) are connected and matched to form the chain plate ring, and the close ends of two adjacent chain plates (6) are hinged;
the two side walls of the chain plate (6) are fixedly connected with a plurality of bulges (13) which are arranged at equal intervals respectively, the bulges (13) on the two sides of one chain plate (6) are arranged in a staggered mode, a gap formed between two adjacent bulges (13) on one side wall of one chain plate (6) is used for the bulges (13) on the other adjacent chain plate (6) to extend in, pin holes (14) are formed in the side wall of each bulge (13), pin shafts are penetrated on all bulges (13) on the side wall of the two adjacent chain plates (6), and the two adjacent chain plates (6) are hinged through the pin shafts;
the chain plate (6) comprises a plurality of positioning chain plates (61) and a plurality of connecting chain plates (62), a plurality of connecting chain plates (62) are arranged between two adjacent positioning chain plates (61), the positioning chain plates (61) are close to a plurality of positioning columns (15) fixedly connected on the side wall of the connecting rubber layer (5), positioning holes matched with the positioning columns (15) are formed in the surface of the connecting rubber layer (5), and the positioning columns (15) extend into the positioning holes and are fixedly adhered to each other.
2. The micro-elliptical elastically deformed traction type elevator brake of claim 1, wherein: the brake shoe assembly comprises a brake shoe (3) which is attached and fixed on the inner wall of the brake arm (1), two brake pads (2) which are arranged up and down are fixed on one side of the brake shoe (3) close to the brake wheel (4), and the inner wall of the brake pad (2) is in contact with the outer wall of the chain plate (6).
3. The micro-elliptical elastically deformed traction type elevator brake of claim 1, wherein: the brake wheel (4) is a rigid wheel.
4. The micro-elliptical elastically deformed traction type elevator brake of claim 1, wherein: the connecting rubber layer (5) is polyurethane rubber.
5. The micro-elliptical elastically deformed traction type elevator brake of claim 1, wherein: the driving piece comprises a fixed base (9), an electromagnetic coil (10) is fixedly connected to the fixed base (9), a push rod bolt (7) and a spring accommodating rod are fixedly connected to two side walls of the fixed base (9) respectively, and the push rod bolt (7) and the spring accommodating rod penetrate through the brake arm (1) and are in sliding connection with the brake arm (1);
the brake device is characterized in that a stop nut (8) is fixedly connected to one end, far away from the electromagnetic coil (10), of the ejector rod bolt (7), a brake spring (11) is sleeved on the spring accommodating rod, a spring gasket (12) is fixedly connected to one end, far away from the electromagnetic coil (10), of the spring accommodating rod, and two ends of the brake spring (11) are fixedly connected with the spring gasket (12) and the outer wall of the brake arm (1) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310311307.2A CN116281708B (en) | 2023-03-28 | 2023-03-28 | Traction type elevator brake with micro-elliptical elastic deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310311307.2A CN116281708B (en) | 2023-03-28 | 2023-03-28 | Traction type elevator brake with micro-elliptical elastic deformation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116281708A CN116281708A (en) | 2023-06-23 |
| CN116281708B true CN116281708B (en) | 2023-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310311307.2A Active CN116281708B (en) | 2023-03-28 | 2023-03-28 | Traction type elevator brake with micro-elliptical elastic deformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116281708B (en) |
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