CN102923547B - Auxiliary braking device of cordless elevator and control method thereof - Google Patents
Auxiliary braking device of cordless elevator and control method thereof Download PDFInfo
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- CN102923547B CN102923547B CN201210434162.7A CN201210434162A CN102923547B CN 102923547 B CN102923547 B CN 102923547B CN 201210434162 A CN201210434162 A CN 201210434162A CN 102923547 B CN102923547 B CN 102923547B
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Abstract
The invention discloses an auxiliary braking device of a cordless elevator and a control method thereof. A break body is composed of a magnetic shaft, a magnetic insulation front cover, a rear baffle and two lateral walls and encircled into a hollow structure with a cylindrical middle, and the magnetic shaft is arranged in the hollow structure and can rotate in the hollow structure; and the magnetic shaft is cylindrical and formed by two permanent magnets and a magnetic insulation interlayer which is arranged in the middle and fixedly connected with the two permanent magnets, magnetic pole directions of two permanent magnets in a same radial direction are identical, and one end of the magnetic shaft is fixedly connected with a rotating mechanism which is connected with an electronic control unit. During emergency braking, the electronic control unit controls a break boot to be close to a rail, and non-contact vortex braking force is generated between the break boot and the rail; the electronic control unit controls the rotating mechanism to rotate, and magnetic pole attraction is produced between the break boot and the rail, so that the break boot is absorbed on the rail, and friction braking force is generated; and the problem that sufficient braking force cannot be provided under the condition that emergency braking happens to a prior cordless elevator is solved.
Description
Technical field
The present invention relates to a kind of cordless elevator, be specifically related to the brake equipment of cordless elevator.
Background technology
Along with the further raising of Chinese Urbanization degree, demand high-rise and high-rise building is increasing.In these high buildings and large mansions, vertical transit system plays very important effect.Common vertical transit system has lifting rope traction elevator and linear electric motors to drive elevator, wherein, in lifting rope traction elevator in the time there is rope-broken accident, adopt pressing-clamp type braking protection, by spring action gripper rail, bridge railway carriage or compartment is stopped, but lifting rope traction elevator is also deposited deficiency both ways: 1, an elevator hoistways can only move a bridge railway carriage or compartment, want to shorten the time of waiting elevator will increase elevator number of units, the payload space that so just certainly will reduce building has increased cost: 2, for some high-rise buildings, in order to ensure safety performance, it is longer thicker that the steel rope of traction elevator must become, and also need to increase the power of motor.
Chinese patent notification number is CN 2545174Y, name is called " elevator that cylindrical linear drives ", scheme at cab top dress safe internal contracting pincers is disclosed, in the time there is emergency episode, use safe internal contracting clamp brake, its defect is: linear electric motors drive elevator can because have a power failure, drive system failure and other reasons and lose thrust, if safe internal contracting pincers lost efficacy again, now elevator can be caused danger.And in emergency braking situation, linear electric motors cannot continue to provide enough braking forces.
Although someone proposes to adopt the technological means of multiple power supply and power storage device use, in case of emergency be aided with regenerative electric power braking cooperative mechanical braking again, but during conversion power supply mode, because there is no counterweight and steel rope, elevator can fall with acceleration due to gravity.
Summary of the invention
The present invention proposes a kind of complemental brake system and control method thereof of cordless elevator, its objective is and makes cordless elevator in case of emergency can continue to provide enough braking forces, improves the safety performance of cordless elevator.
The technical scheme that the complemental brake system of cordless elevator of the present invention adopts is: comprise hydraulic pressure energy supplying system, lock body, lock boots, lock body and lock boots are between rail and bridge railway carriage or compartment, lock boots are fixedly connected with lock body and face rail parallel with rail, between lock body and bridge railway carriage or compartment, have two power transmission guide pillars that make lock body parallel motion and, lock body is by magnetic axis, magnetic insulation protecgulum, rear bulkhead and two sidewall compositions, magnetic insulation protecgulum is fixedly connected on the front end of two sidewalls, rear bulkhead is fixedly connected on the rear portion of two sidewalls, lock boots are fixedly connected with rear bulkhead, two sidewalls, magnetic insulation protecgulum, it is columniform hollow structure that rear bulkhead surrounds a centre, magnetic axis is arranged in this hollow structure and can rotates in hollow structure, magnetic axis by two permanent magnets be positioned in the middle of and be fixedly connected with cylindric that the magnetic insulation interlayer of two permanent magnets jointly forms, two permanent magnets are identical in same footpath pole orientation upwards, one end of magnetic axis is fixedly connected with rotating mechanism, rotating mechanism connecting electronic control unit, hydraulic pressure energy supplying system comprises Hydraulic Pump, hydraulic accumulator, electrical motor, petrol storage tank, two three-position four-way valves, two hydraulic actuating cylinders, be fixedly connected with two hydraulic actuating cylinders with on the side, bridge railway carriage or compartment of two power transmission guide pillar homonymies, the piston mouth of two hydraulic actuating cylinders is level attitude and is fixedly connected with lock body, Hydraulic Pump connects electrical motor, Hydraulic Pump and energy storage are connected to form high pressure oil-feed loop, Hydraulic Pump and petrol storage tank even form low pressure oil return circuit, high pressure oil-feed loop is connected with two three-position four-way valves respectively with low pressure oil return circuit, the other end of two three-position four-way valves is connected with the chamber, left and right of two hydraulic actuating cylinders respectively, electronic control unit connects storage battery, and storage battery connects electrical motor, and electronic control unit also connects respectively two three-position four-way valves and various sensor.
The control method of complemental brake system of the present invention is: have following steps:
A, in the time of emergency braking, two three-position four-way valves of electronic control unit control are in left position, the left chamber that in energy storage, hydraulic energy drives hydraulic oil liquid to enter two hydraulic actuating cylinders promotes piston and moves right, and makes lock boots near rail, mutually produces non-contact turbulent flow braking force between lock boots and rail;
B, electronic control unit drive rotating mechanism rotation, produce magnetic pole gravitation between lock boots and rail, and lock boots are pull-in on rail, produce friction brake force;
C, when cancelling when emergency braking, two three-position four-way valves of electronic control unit control are in right position, the right chamber that in energy storage, hydraulic energy drives hydraulic oil liquid to enter two hydraulic actuating cylinders promotes piston to left movement, makes lock body away from rail.
Complemental brake system of the present invention has solved existing cordless elevator cannot provide the problem of enough braking forces in emergency braking situation, has the advantages such as consumed energy is little, high speed deceleration and stopping performance is good, non-maintaining., this complemental brake system is coordinated with safety mechanical brake equipment meanwhile, in emergency braking situation, can make elevator accurately park certain layer, evacuate rapidly passenger, safe and reliable.
Brief description of the drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is cordless elevator complemental brake system scheme of installation of the present invention;
Fig. 2 is A-A cutaway view Amplified image in Fig. 1;
Fig. 3 be in Fig. 1-2 lock body 2 at the fundamental diagram of stand-by position;
Fig. 4 be in Fig. 1-2 lock body 2 working position fundamental diagram;
1-rail, 2-lock body, 3-rotating mechanism, 4, 5-hydraulic actuating cylinder, 6, 7-power transmission guide pillar, 8-balance cock, 9, 10-three-position four-way valve, 11-electronic control unit, 12-storage battery, 13-sensor, 14-by pass valve, 15-hydraulic accumulator, 16-petrol storage tank, 17-electrical motor, 18-Hydraulic Pump, 19-lock boots, 20-bridge railway carriage or compartment, 21-pressure sensor, 22-low pressure oil return circuit, 23-high pressure oil-feed loop, 24-signal wire (SW), 25-wireless signal receiver, 26-magnetic axis, 27-protecgulum, 28-sidewall, 29-rear bulkhead, the magnetic line of force of 30-conductively-closed, 31-air gap, 33-permanent magnet, 34-magnetic insulation interlayer.
Detailed description of the invention
As Fig. 1, the present invention includes linear pattern permanent magnet braking device, hydraulic pressure energy supplying system, electronic control system and rail 1.
Wherein linear pattern permanent magnet braking device comprises lock body 2, lock boots 19, power transmission guide pillar 6 and 7, rotating mechanism 3.Rail 1 is to be vertically fixed on hoistway, has lock body 2 and lock boots 19 between rail 1 and bridge railway carriage or compartment 20, and lock boots 19 are fixedly mounted on lock body 2, and lock boots 19 are faced rail 1 and are arranged in parallel with rail 1.Between bridge railway carriage or compartment 20 and lock body 2, be connected with 7 with two power transmission guide pillars 6, two power transmission guide pillars 6 and 7 are arranged in parallel up and down, two power transmission guide pillars 6 are all fixedly connected with 7 one end that 20 sides, bridge railway carriage or compartment are solid, the equal sliding block joint lock of other end body 2, can make lock body 2 move freely in the horizontal direction, the guide pillar of power transmission simultaneously 6 and 7 also plays braking force between lock boots 19 and rail 1 is delivered to the effect on bridge railway carriage or compartment 20.
Fig. 2 is the cross-sectional view of lock body 2, lock body 2 is made up of magnetic axis 26, magnetic insulation protecgulum 27, rear bulkhead 29 and two sidewalls 28, it is columniform hollow structure that two sidewalls 28, magnetic insulation protecgulum 27, rear bulkheads 29 surround a centre, magnetic axis 26 is arranged in this hollow structure, can in hollow structure, rotate, magnetic insulation protecgulum 27 is fixed on the front end of two sidewalls 28, for stoping magnetic circuit to pass through.Rear bulkhead 29 also has the function that magnetic insulation protecgulum 27 is identical, and rear bulkhead 29 is the rear portions that are fixed on two sidewalls 28.Lock boots 19 are positioned at the rear bottom of lock body 2, the wearing plate contacting with rail 1 as lock body 2, and lock boots 19 are fixedly connected with rear bulkhead 29.
Magnetic axis 26 is made up of two permanent magnets 33 and magnetic insulation interlayer 34, and two permanent magnets 33 are separately fixed at the two sides of magnetic insulation interlayer 34, in the middle of magnetic insulation interlayer 34 is positioned at, jointly forms cylindric.Two permanent magnets 33 are identical in same footpath pole orientation upwards, can change the pole orientation of whole magnetic axis 26 by rotation magnetic axis 26, and one end of magnetic axis 26 is fixedly connected with rotating mechanism 3, drives magnetic axis 26 to rotate by rotating mechanism 3.Rotating mechanism 3 is connected with the electronic control unit 11 of electronic control system, can be an electrical motor or HM Hydraulic Motor, rotating mechanism 3 is arranged in one end of lock body 2, the power take-off shaft of rotating mechanism 3 is that rotor or hydraulic motor rotor are coaxially fixedly connected with magnetic axis 26, and motor stator bracket or hydraulic motor shell are fixedly connected on lock body 2, rotating mechanism 3 just can drive magnetic axis 26 to rotate like this.
Hydraulic pressure energy supplying system comprises Hydraulic Pump 18, hydraulic accumulator 15, by pass valve 14, electrical motor 17, petrol storage tank 16, three-position four-way valve 9 and 10, hydraulic actuating cylinder 4 and 5 and hydraulic tubing.Be fixedly connected with hydraulic actuating cylinder 4 and 5 with on 20 sides, bridge railway carriage or compartment of two power transmission guide pillars 6 and 7 homonymies, the piston mouth of hydraulic actuating cylinder 4 and 5 is level attitude, and level is fixedly connected with lock body 2, like this lock body 2 can be between rail 1 and bridge railway carriage or compartment 20 under the effect of hydraulic actuating cylinder 4 and 5 pistons parallel motion.At the top in bridge railway carriage or compartment 20 stationary hydraulic pump 18, energy storage 15, petrol storage tank 16, other Hydraulic Elements also can be fixed on the top in bridge railway carriage or compartment 20.Hydraulic Pump 18 connects electrical motor 17; Hydraulic Pump 18 is connected to form high pressure oil-feed loop 23 with energy storage 15, setting pressure sensor 21 on high pressure oil-feed loop 23, Hydraulic Pump 18 is connected to form low pressure oil return circuit 22 with petrol storage tank 16, high pressure oil-feed loop 23 is connected with 10 with three-position four-way valve 9 respectively with low pressure oil return circuit 22, and three-position four-way valve 9 is connected with the chamber, left and right of hydraulic actuating cylinder 4 and 5 respectively with 10 the other end.Between high pressure oil-feed loop 23 and low pressure oil return circuit 22, connect by pass valve 14, be used for controlling the oil pressure in high pressure oil-feed loop 23, prevent that the oil pressure in high pressure oil-feed loop 23 is higher than limit value.Connecting balanced valve 8 between the left chamber of two hydraulic actuating cylinders 4 and 5, the effect of balance cock 8 is in case of emergency to ensure that the application force of two hydraulic actuating cylinders 4,5 is identical.
Electronic control system comprises electronic control unit 11, various sensor 13 etc., electronic control unit 11 connects storage battery 12, storage battery 12 connects electrical motor 17, powered to electrical motor 17 by storage battery 12, electrical motor 17 drives Hydraulic Pump 18 to work, hydraulic oil in petrol storage tank 16 is pumped in energy storage 15, make its hydraulic energy return to maxim.Electronic control unit 11 also connects respectively various sensors 13, wireless signal receiver and the signal control circuits such as electrical motor 17, rotating mechanism 3, wireless signal receiver 25, three-position four-way valve 9 and 10, bridge railway carriage or compartment speed sensor, bridge railway carriage or compartment position transduser, bridge railway carriage or compartment weight sensor by signal wire (SW) 24.
Fig. 3 is the schematic diagram of lock body 2 in stand-by position, and lock body 2 is in lower inoperative position.Lock boots 19 have 5-7mm apart from rail 1, but now the magnetic pole of magnetic axis 26 is by two sidewall 28 short circuits, so fail to form flux loop between lock boots 19 and rail 1,31 is air gap, 30 magnetic line of forces for conductively-closed.
Fig. 4 be lock body 2 at working position schematic diagram, time drive magnetic axis 26 to rotate in stand-by position
, now will form different magnetic pole in lock boots 19 both sides, and and rail 1 between produce magnetic pole gravitation, and this gravitation is pull-in on rail 1 lock boots 19, so finally directly produce braking force between lock boots 19 and rail 1 in the mode of friction.
When elevator operation, electronic control unit 11 receives the signal from wireless signal receiver 25, judges whether elevator enters emergency braking condition,, when elevator runs into power failure, drive system fault, breakdown signal can be sent to wireless signal receiver 25.Electronic control unit 11 also receives the information from sensors 13 such as bridge railway carriage or compartment speed sensor, bridge railway carriage or compartment position transduser, bridge railway carriage or compartment weight sensors, controls the state of three-position four-way valve 9,10 and the rotation of rotating mechanism 3.Rotating mechanism 3 is the actuating units that drive magnetic axis rotation according to electronic control unit 11 braking instructions, can select hydraulic drive or electric power, compressed air-driven.
In the time that the control command of electronic control unit 11 enters mode of operation, electronic control unit 11 is controlled three-position four-way valve 9, 10 in left position, in energy storage 15, hydraulic energy drives hydraulic oil liquid to enter hydraulic actuating cylinder 4, 5 left chamber promotes piston and moves right, make lock boots 19 near rail 1, electronic control unit 11 braking instructions drive rotating mechanism 3 to rotate, lock boots 19 both sides will form different magnetic poles, and and rail 1 between produce magnetic pole gravitation, and this gravitation is pull-in on rail 1 lock boots 19, so finally directly produce braking force between lock boots 19 and rail 1 in the mode of friction.In the time that electronic control unit 11 is cancelled emergency braking, electronic control unit 11 is controlled three-position four-way valve 9,10 in right position, and the right chamber that in energy storage 15, hydraulic energy drives hydraulic oil liquid to enter hydraulic actuating cylinder 4,5 promotes piston to left movement, makes lock body 2 away from rail 1.
The hydraulic energy storing in energy storage 15 enough cordless elevator completes repeatedly large intensity braking, when the hydraulic energy in energy storage 15 is during lower than certain value, electronic control unit 11 detects that the pressure of pressure sensor 21 is lower than preset value, electronic control unit 11 is controlled elevator and is failure to actuate, force elevator to rest on bottom
Complemental brake system of the present invention has two kinds of braking modes: non-contact turbulent flow braking, friction braking.
Hydraulic actuating cylinder 4,5 effect makes lock body 2 press close to rail 1 and does not contact rail 1, and under the effect of rotating mechanism 3, lock body 2 rotates in lock boots 19, and magnetic line of force forms C/LOOP (working position) as shown in Figure 4 in permanent magnet 33 and rail 1.Because lock boots 19 and not laminating of rail 1, because rail 1 does cutting magnetic induction and answer the relative motion of line, thereby on rail 1 surface and go out current vortex along transversal surface certain depth internal induction, magnetic field can be to producing the resistance that stops its relative motion with electric rail, between lock boots 19 and rail 1, mutually produce braking force, i.e. non-contact turbulent flow braking.
Control hydraulic actuating cylinder 4,5 and make permanent magnet braking device contact rail, under the effect of rotating mechanism 3, lock body 2 rotates in lock boots 19, and magnetic line of force forms C/LOOP in permanent magnet 33 and rail 1, between lock boots 19 bottom surfaces and rail 1, produce so enough attractive force elevators and slow down rapidly, be i.e. friction braking.
Complemental brake system of the present invention works in the time that elevator needs emergency braking.In the time that cordless elevator loses thrust because of power failure, drive system failure and other reasons, wireless signal receiver 13 receives breakdown signal, and failure judgement reason is elevator power failure or drive system fault.If elevator power failure, adopts non-contact turbulent flow braking, control the anglec of rotation of lock body 2, realize the adjusting of braking force, electronic control unit 11, slowly slows down elevator and waits for that elevator starts backup power as feedback control signal according to bridge railway carriage or compartment speed sensor.
If drive system fault, has judged whether that according to the weight sensor in bridge railway carriage or compartment passenger is in elevator.Adopt non-contact turbulent flow braking that elevator is slowly slowed down if there is passenger to control complemental brake system, when deceleration of elevator is during to nearest one deck, electronic control unit 11 is according to the information of bridge railway carriage or compartment speed sensor and bridge railway carriage or compartment position transduser, control complemental brake system and adopt friction braking, control mechanical safety device effect bridge railway carriage or compartment is accurately anchored in to this one deck, open elevator door and make passenger leave elevator, close elevator and wait for that maintainer overhauls; Adopt non-contact turbulent flow braking that elevator is slowly slowed down if do not have passenger to control complemental brake system, when deceleration of elevator is during to bottom, electronic control unit 11 is according to the information of bridge railway carriage or compartment speed sensor and bridge railway carriage or compartment position transduser, control complemental brake system and adopt friction braking, make bridge railway carriage or compartment impinge upon the speed minimum on energy disperser, close elevator and wait for that maintainer overhauls.
Claims (5)
1. the complemental brake system of a cordless elevator, comprise hydraulic pressure energy supplying system, lock body (2), lock boots (19), lock body (2) and lock boots (19) are positioned between rail (1) and bridge railway carriage or compartment (20), lock boots (19) are fixedly connected with lock body (2) and face rail (1) parallel with rail (1), between lock body (2) and bridge railway carriage or compartment (20), there are two power transmission guide pillars (6 that make lock body (2) parallel motion, 7), it is characterized in that: lock body (2) is by magnetic axis (26), magnetic insulation protecgulum (27), rear bulkhead (29) and two sidewalls (28) composition, magnetic insulation protecgulum (27) is fixedly connected on the front end of two sidewalls (28), rear bulkhead (29) is fixedly connected on the rear portion of two sidewalls (28), rear bulkhead (29) also has the function for stop magnetic circuit pass through identical with magnetic insulation protecgulum (27), lock boots (19) are fixedly connected with rear bulkhead (29), two sidewalls (28), magnetic insulation protecgulum (27), it is columniform hollow structure that rear bulkhead (29) surrounds a centre, magnetic axis (26) is arranged in this hollow structure and can rotates in hollow structure, magnetic axis (26) by two permanent magnets (33) be positioned in the middle of and be fixedly connected with cylindric that the magnetic insulation interlayer (34) of two permanent magnets (33) jointly forms, two permanent magnets (33) are identical in same footpath pole orientation upwards, one end of magnetic axis (26) is fixedly connected with rotating mechanism (3), rotating mechanism (3) connecting electronic control unit (11), hydraulic pressure energy supplying system comprises Hydraulic Pump (18), hydraulic accumulator (15), electrical motor (17), petrol storage tank (16), two three-position four-way valves (9, 10), two hydraulic actuating cylinders (4, 5), with two power transmission guide pillars (6, 7) on the side, bridge railway carriage or compartment (20) of homonymy, be fixedly connected with two hydraulic actuating cylinders (4, 5), two hydraulic actuating cylinders (4, 5) piston mouth is level attitude and is fixedly connected with lock body (2), Hydraulic Pump (18) connects electrical motor (17), Hydraulic Pump (18) is connected to form high pressure oil-feed loop (23) with energy storage (15), Hydraulic Pump (18) is connected to form low pressure oil return circuit (22) with petrol storage tank (16), high pressure oil-feed loop (23) and low pressure oil return circuit (22) respectively with two three-position four-way valves (9, 10) be connected, two three-position four-way valves (9, 10) the other end respectively with two hydraulic actuating cylinders (4, 5) chamber, left and right connects, electronic control unit (11) connects storage battery (12), storage battery (12) connects electrical motor (17), electronic control unit (11) also connects respectively two three-position four-way valves (9,10) and various sensor, and high pressure oil-feed loop (23) is provided with pressure sensor (21).
2. the complemental brake system of a kind of cordless elevator according to claim 1, it is characterized in that: between high pressure oil-feed loop (23) and low pressure oil return circuit (22), connect by pass valve (14), connecting balanced valve (8) between the left chamber of two hydraulic actuating cylinders (4,5).
3. a control method for the complemental brake system of cordless elevator as claimed in claim 1, is characterized in that having following steps:
When A, emergency braking, electronic control unit (11) is controlled two three-position four-way valves (9,10) in left position, the left chamber that in energy storage (15), hydraulic energy drives hydraulic oil liquid to enter two hydraulic actuating cylinders (4,5) promotes piston and moves right, make lock boots (19) near rail (1), between lock boots (19) and rail (1), mutually produce non-contact turbulent flow braking force;
B, electronic control unit (11) drive rotating mechanism (3) rotation, between lock boots (19) and rail (1), produce magnetic pole gravitation, and lock boots (19) are pull-in on rail 1, produce friction brake force;
C, cancellation emergency braking, electronic control unit (11) is controlled two three-position four-way valves (9,10) in right position, the right chamber that in energy storage (15), hydraulic energy drives hydraulic oil liquid to enter two hydraulic actuating cylinders (4,5) promotes piston to left movement, makes lock body (2) away from rail (1).
4. control method according to claim 3, is characterized in that: when electronic control unit (11) drives rotating mechanism (3) rotation, control the anglec of rotation of lock body (2) to realize the adjusting of braking force.
5. control method according to claim 4, is characterized in that: when the hydraulic energy in energy storage (15) is during lower than certain value, electronic control unit (11) detects that the pressure of pressure sensor (21) is lower than preset value, controls elevator and is failure to actuate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210434162.7A CN102923547B (en) | 2012-11-05 | 2012-11-05 | Auxiliary braking device of cordless elevator and control method thereof |
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| CN201210434162.7A CN102923547B (en) | 2012-11-05 | 2012-11-05 | Auxiliary braking device of cordless elevator and control method thereof |
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| CN102923547B true CN102923547B (en) | 2014-12-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231959B (en) * | 2013-04-11 | 2015-07-08 | 中国特种设备检测研究院 | Permanent magnet eddy current linear braking system for elevator testing |
| CN103420260B (en) * | 2013-07-12 | 2015-12-23 | 河南理工大学 | The divided stator segmentation permanent-magnetism linear motor of distributed power supply is adopted directly to drive elevator system |
| US10689228B2 (en) | 2015-02-04 | 2020-06-23 | Otis Elevator Company | Elevator system evaluation device |
| US10654686B2 (en) | 2015-06-30 | 2020-05-19 | Otis Elevator Company | Electromagnetic safety trigger |
| US11066274B2 (en) | 2015-06-30 | 2021-07-20 | Otis Elevator Company | Electromagnetic safety trigger |
| CN112678646B (en) * | 2021-01-11 | 2022-04-12 | 安川双菱电梯有限公司 | Elevator with multiple safety protection functions |
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| JPH09208150A (en) * | 1996-02-02 | 1997-08-12 | Hitachi Ltd | Electromagnetic brake device |
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| US5791442A (en) * | 1994-05-25 | 1998-08-11 | Orscheln Management Co. | Magnetic latch mechanism and method particularly for linear and rotatable brakes |
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| CN1452570A (en) * | 2000-07-17 | 2003-10-29 | 磁力技术有限公司 | Eddy current brake system with dual use contuctor fin |
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Effective date of registration: 20210519 Address after: Quanpu Town, Quanbei village, Liangshan County, Jining City, Shandong Province 272600 Patentee after: Liangshan Xuri Precision Machinery Manufacturing Co.,Ltd. Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University |
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