CN104832573B - Work brake apparatus and its lifting appliance of application - Google Patents
Work brake apparatus and its lifting appliance of application Download PDFInfo
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- CN104832573B CN104832573B CN201510239211.5A CN201510239211A CN104832573B CN 104832573 B CN104832573 B CN 104832573B CN 201510239211 A CN201510239211 A CN 201510239211A CN 104832573 B CN104832573 B CN 104832573B
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Abstract
The invention discloses a kind of Work brake apparatus, including drive housing main frame；The drive housing is arranged on the axle portion part of bearing by one-way lock mechanism, and the bearing is fixed, and the main frame is connected with drive housing by the frictional disk stacked；Input gear and load gear are coaxially cased with the main frame of the frictional disk side, the input gear is rotatably set with main frame, and is close to frictional disk setting, and the load gear is fixed with main frame and is set with；The input gear is provided with the first ratchet of axial direction, the second axial ratchet is relatively provided with the load gear, the ratchet of first ratchet and the second ratchet is in axial direction mutually close to be engaged, the ratchet is unidirectional tooth, the inclined-plane of axial thrust is produced while with circumferential transmitting rotary power, the another side of the ratcheted ramp is the ratchet back side of only circumferential passing power；The locking direction of the one-way lock mechanism is consistent with the inclined-plane power direction of transfer of the ratchet.
Description
Technical field
The invention belongs to brake apparatus, is specifically that one kind is used for winch, truck crane and other kinds lifting machinery equipment
Loading brake apparatus and its application lifting appliance.
Background technology
Work brake apparatus is on the hoist engine applied to hoisting machinery, for preventing the hoisting heavy of hoist engine in motor
During stalling or speed-changing, weight glides suddenly, and all possessing on existing hoist engine has brake assemblies, generally by
Frictional disk is realized automatically, but the actual conditions according to motor or hoist engine are needed in braking, is being needed to hoisting heavy
When holding, reach the purpose of braking to the pressure of one axial direction of frictional disk loading, but under many operating modes, due to
The limitation of structure space or transmission condition, be not suitable for or frictional disk axial direction can not be loaded, then how to be made
It is dynamic then into problem.
Publication No. be CN 103332625A Chinese invention patent application, disclose a kind of clutch brake and including
The hoist engine and its operating method of the device, it is realized the clutch and brake function of hoist engine by freewheel clutch, prevents elevator
Machine slips hook in the presence of hoisting heavy, but the axially loaded of the brake(-holder) block in its technical scheme is to combine hydraulic system to realize
, structure is excessively complicated, needs the hydraulic system outside quota to realize the separation of braking, and hydraulic system during lifting
Need often to safeguard.
The content of the invention
Present invention solves the technical problem that it is：For system architecture existing for Work brake apparatus in existing hoisting machinery
The defects of complicated, there is provided a kind of feasibility and reliability be higher, purely mechanic control, control accuracy are high and the load brake of long lifespan
Device.
The present invention adopts the following technical scheme that realization：
A kind of Work brake apparatus, including the main frame 5 of drive housing 4；
The drive housing 4 is arranged on the axle portion part of bearing 1 by one-way lock mechanism 3, and the bearing 1 is fixed, institute
Main frame 5 is stated to be connected by the frictional disk stacked with drive housing 4；
Input gear 8 and load gear 10 are coaxially cased with the main frame 5 of the frictional disk side；
The input gear 8 is rotatably set with main frame 5, and is close to frictional disk setting, the load gear 10 and master
Body frame 5 fixes suit；
The input gear 8 is provided with the first ratchet 12 of axial direction, is relatively provided with the load gear 10 axial
Second ratchet 13, the ratchet 18 of the ratchet 13 of the first ratchet 12 and second are in axial direction mutually close to be engaged, the ratchet
For unidirectional tooth, the inclined-plane 19 of generation axial thrust, the another side of the ratcheted ramp while there is circumferential transmitting rotary power
For the ratchet back side 20 of only circumferential passing power；
The locking direction of the one-way lock mechanism is consistent with the inclined-plane power direction of transfer of the ratchet.
Further, the one-way lock mechanism 3 is freewheel clutch, the outer ring of the freewheel clutch and drive housing
4 are connected, and the axle portion part of inner ring and bearing 1 is connected, and use is equipped between the bearing 1 at freewheel clutch both ends and drive housing 4
In the bearing 2 of rolling support.
Further, the frictional disk is sleeved on the axle of main frame 5, including static friction disk 6 and dynamic friction disk 7, wherein,
The outer ring of static friction disk 6 is provided with projection, is connected with the inwall spline of drive housing 4, and the inner ring of dynamic friction disk 7 is provided with interior
Spline, it is connected with the spline of main frame 5, the static friction disk 6 and dynamic friction disk 7 are stacked alternately to form friction pair, and pass through
The axial force of input gear and load gear compresses.
Further, disk spring 21 is provided between the input gear 8 and the frictional disk of end, to kinematics and static friction disk
Between carry out pre-pressing, realize being brought into close contact for kinematics and static friction disk, while there is cushioning effect.
Further, described one end of load gear 10 connects input gear 8, the other end by the first ratchet and the second ratchet
Pass through the axial lock of locking nut 11.
Further, the ratchet 13 of the first ratchet 12 or second is arranged in the groove 16 of corresponding gear, another ratchet
It is arranged on the boss 17 of corresponding gear, the boss and groove coordinate, and realize the closed assembly of ratchet.
Further, the input gear 8 is rotatably sleeved on by bushing 9 on the axle of main frame 5.
In the present invention, the use hygrometric state paper friction material of the frictional disk.
The invention also discloses a kind of lifting appliance using above-mentioned Work brake apparatus, including power source, load brake
Device and hoist engine, the output shaft of the power source are connected to the input gear 8 of Work brake apparatus by gear train assembly,
The input shaft of the hoist engine is connected to the load gear 10 of Work brake apparatus by gear train assembly.
The state when present invention can complete weight lifting in power transmission process is kept, and dexterously make use of two relatively
Axial movement trend occurs for the inclined-plane for moving ratchet ratchet on gear, applies moment of torsion by load gear, will by the inclined-plane of ratchet
Moment of torsion is converted into the axially loaded power perpendicular to rubbing surface, applies thrust between kinematics and static friction disk, torque is changed
Into the axially loaded power between frictional disk, frictional force is produced between dynamic friction disk and static friction disk, connects drive housing and main body
Frame, self-locking and return-stopping function are realized with reference to one-way lock mechanism, prevent from reversing.One-way lock mechanism is realized using freewheel clutch
Unidirectional delivery torque, the outer ring of freewheel clutch are connected with drive housing, the axis connection on the inner ring and bearing of freewheel clutch,
So that drive housing can only unidirectional delivery torque, while also using driving and driven part speed of related movement change or rotation side
To change make freewheel clutch combination/disengagement automatically, complete to realize that fast, conversion surmounts state at a slow speed in fast feed machinery
Function.The device volume is compact, and design is exquisite, and the sensitivity that torque is converted into axial force is very high, with reference to using Wet-type paper
Friction material as frictional disk, the friction of friction material, polishing machine are excellent, service life length, and control accuracy is high.
The present invention is a kind of Work brake apparatus, suitable for winch, truck crane and other kinds lifting machinery equipment, is born
Carry brake apparatus and convert torque into axially loaded power, one-way lock mechanism is coordinated by frictional disk, autonomous loading, prevents from lifting by crane
Weight reverses, and realizes self-locking and the return-stopping function of lifting appliance, using freewheel clutch in machine driving by driving and driven part
Speed of related movement changes or the change of direction of rotation makes the specific function that it combines or disengaged automatically, completes in fast feed machine
Realize that fast, conversion surmounts state at a slow speed in tool.
From the above mentioned, the Work brake apparatus that the present invention uses uses pure mechanic structure, compact, passes through load transmission
Moment of torsion be converted into the axial pressing force of self-locking, be skillfully constructed, control is sensitive, has ensured using its lifting appliance security
Energy.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Brief description of the drawings
Fig. 1 is the schematic internal view of Work brake apparatus in embodiment 1.
Fig. 2 is the structural representation of the input gear in embodiment 1.
Fig. 3 is the structural representation of the load gear in embodiment 1.
Fig. 4 is that the part ratchet between input gear and load gear in embodiment 1 is engaged schematic diagram.
Fig. 5 is the schematic diagram of mechanism of the lifting appliance of application load brake apparatus in embodiment 2.
Fig. 6 is the fundamental diagram of the lifting appliance in embodiment 2.
Label in figure：1- bearings, 2- bearings, 3- one-way lock mechanisms, 4- drive housing, 5- main frames, 6- static friction disks,
7- dynamic friction disks, 8- input gears, 9- bushings, 10- load gears, 11- locking nuts, the ratchets of 12- first, the ratchets of 13- second,
14- hoist engines, 15- motor, 16- grooves, 17- boss, 18- ratchets, 19- inclined-planes, the 20- back sides, 21- disk springs.
Embodiment
Embodiment 1
Referring to Fig. 1, a kind of Work brake apparatus, including it is bearing 1, one-way lock mechanism 3, drive housing 4, main frame 5, defeated
Enter gear 8 and load gear 10.
Drive housing 4 is arranged on the axle portion part of bearing 1 by one-way lock mechanism 3, and bearing 1 is fixed, in the present embodiment,
The one-way lock mechanism 3 is freewheel clutch, and outer ring and the drive housing 4 of the freewheel clutch are connected, inner ring and bearing 1
Axle portion part be connected, the bearing 2 for rolling support is equipped between the bearing 1 at freewheel clutch both ends and drive housing 4.
Main frame 5 realizes power connector with drive housing 4 by the frictional disk stacked；Frictional disk is sleeved on main frame 5
On axle, including static friction disk 6 and dynamic friction disk 7, wherein, static friction disk 6 is connected together with simultaneously with drive housing 4 and rotated, dynamic friction
Disk 7 is connected together with simultaneously with main frame 5 and rotated, and the outer ring of static friction disk 6 is provided with projection, is connected with the inwall spline of drive housing 4,
The inner ring of dynamic friction disk 7 is provided with internal spline, is connected with the spline of main frame 5, and static friction disk 6 and dynamic friction disk 7 are stacked alternately shape
Into friction pair, contacted with each other between frictional disk, in the presence of no axial pressing force, can mutually slide, not influence main frame
Relative rotation between drive housing, static friction disk 6 and dynamic friction disk 7 are forced by the axial direction of input gear and load gear
Tightly.
Input gear 8 and the coaxial package of load gear 10 on the main frame 5 of frictional disk side, wherein, input gear 8 is adopted
Rotatably it is sleeved on main frame 5 with bushing 9, and is close to frictional disk setting, load gear 10 is fixed with main frame 5 and is set with, can
Using key connection.
With reference to referring to Fig. 2 and Fig. 3, input gear 8 is provided with the first ratchet 12 of axial direction, is relatively set on load gear 10
There is the second axial ratchet 13, referring to Fig. 4, the ratchet 18 of the ratchet 13 of the first ratchet 12 and second is in axial direction mutually tight
Patch occlusion, the ratchet 18 is unidirectional tooth, and the inclined-plane 19 of axial thrust is produced while having circumferential transmitting rotary power, described
The another side of ratcheted ramp is the ratchet back side 20 of only circumferential passing power, and the ratchet back side 20 forms briar tooth with inclined-plane 19, and it is tied
Structure can be found in the unidirectional briar tooth tooth form of common click；The one end of load gear 10 is connected defeated by the first ratchet and the second ratchet
Enter gear 8, input gear 8 is provided with dish equivalent to the compression plate of frictional disk between the static friction disk 6 of input gear 8 and end
Shape spring 21, for being preloaded between kinematics and static friction disk, keeping the close contact between kinematics and static friction disk.Load tooth
Be bolted with locking nut 11 axial lock, two gears on the other end main frame of wheel 10, input gear 8 relative to frictional disk only
There is the trend for applying axial force, actual displacement is not produced in specific assembling.
As shown in Figures 2 and 3, the first ratchet 12 or the second ratchet 13 are arranged in the groove 16 of corresponding gear, another spine
Wheel is arranged on the boss 17 of corresponding gear, and boss and groove coordinate, and realize the closed assembly of ratchet.
In assembling, the locking direction of one-way lock mechanism is consistent with the inclined-plane power direction of transfer of ratchet.
The Work brake apparatus of the present embodiment meet it is claimed below (direction rotated below be Fig. 1 shown in see from right to left
Survey)：
A) in the counterclockwise direction, first, the load that load gear 10 connects is contacted by ratcheted ramp 19 transmits moment of torsion extremely
Input gear 8, and the thrust of axial compression frictional disk is produced, meanwhile, load gear 10 should connect certain load torque,
When being rotated in the counterclockwise direction by input gear 8, input gear 8 can gradually reduce load gear by the back side 20 of ratchet
Load torque suffered by 10, now the frictional force between frictional disk is weakened, and main frame can rotate relative to drive housing, inputs tooth
Wheel 8 rotates counterclockwise, and load gear 10 is free to rotate in the counterclockwise direction in the presence of load；
B) along clockwise direction, if input gear 8 is without driving torque, likewise, the load pair of load gear connection
Load gear 10 applies torque M F, and now load gear 10 is applied axially by ratcheted ramp 19 to input gear and frictional disk
Pressure, extrusion friction disk produces frictional force and drive housing and main frame is connected, now because freewheel clutch is reversely locked
Only, drive housing can not rotate under torque M F effects, can keep the locking of load gear 10；If input gear 8 is applied suitable
Moment of torsion is transmitted in clockwise torque M Q, the ratcheted ramp contact between input gear 8 and load gear 10, now input gear 8
Caused axial pressing force also increases between load gear 10, when the input torque MQ clockwise of input gear 8 reaches X1.MF
When, produce between kinematics and static friction disk it is relative slide, it is dynamic and static when the input torque MQ when input gear 8 rotates reaches X2.MF
Frictional disk generation is continuously slipping, and now input gear 8 directly directly drives load gear 10 suitable by the inclined-plane 19 of ratchet ratchet
Hour hands rotate.Wherein X1, X2 is transformation ratio, and X2 ＞ X1, X1, X2 can by changing click, plane bearing (serves as a contrast
Set) bevel angle and the performance parameter of friction material carry out adjusting size.
Further illustrate, it is every by change ratchet, plane bearing bevel angle, friction material parameter come change conversion
The design of coefficient (X1, X2) belongs to the category that the present invention protects.
The friction material of the frictional disk of the present embodiment be hygrometric state paper substrate without lost material, due to the particularity of friction material,
Friction material should work under the working environment of lubricating oil, and its wear extent is minimum, can avoid polluting lubricating oil.
Embodiment 2
Referring to Fig. 5, the invention also discloses a kind of lifting appliance of Work brake apparatus in Application Example 1, including move
Power source, Work brake apparatus and hoist engine, for the present embodiment by taking the lifting appliance that motor drives as an example, power source is motor
15, the output shaft of motor 15 is connected to the input gear 8 of Work brake apparatus by gear train assembly, hoist engine 14 it is defeated
Enter the load gear 10 that axle is connected to Work brake apparatus by gear train assembly.
The operation principle of Work brake apparatus such as embodiment 1, pass through spine when two gears rotate counterclockwise, between them
Rear flank 20 can be rotated freely, for transferring weight；In turn, when load gear 10 bears certain load MF, there is two
Kind situation, first, input gear 8 has clockwise driving torque, second, input gear 8 is without driving torque.Input gear 8 is without drive
During dynamic torque, the autonomous kinematics and static friction disk loaded in brake apparatus compresses under axial pressing force effect caused by inclined-plane, is driven
Housing and the main frame locking in the presence of freewheel clutch；When input gear 8 has driving torque, two gears are between
The inclined-plane 19 of ratchet transmit moment of torsion, and the frictional force that frictional disk compresses before overcome simultaneously, finally realize between two gears
Ratchet directly transmit moment of torsion.
With reference to as follows referring to Fig. 6, the concrete operating principle of lifting appliance：Motor 15 is connected by Work brake apparatus and rolled up
Machine 14 is raised, hoist engine slings the weight of steel wire hang or put down by rotating.
When putting down weight, input gear 8 and load gear 10 are contacted by the ratchet back side 20, and first, load gear 10 exists
Torque counterclockwise caused by weight, while the pressing friction disk of input gear 8 is acted on, meanwhile, the driving counterclockwise of input gear 8
Torque can offset the torque of load gear 10, and the axial pressing force of frictional disk is gradually cut down by the transmission moment of torsion of the back side 20, makes to rub
It relative can be slided between wiping disk, realize that input gear and load gear are free to rotate in the counterclockwise direction.
During hoisting heavy, freewheel clutch transmits torque, and load gear 10 bears torque counterclockwise caused by weight, this
When torque axial normal pressure is changed into by ratcheted ramp between input gear and load gear, applied to kinematics and static friction disk
Add brake weight so that certain moment of friction is kept between dynamic and static disk.
When motor rises weight without driving moment, hanging object will remain in certain state, drive housing with
Freewheel clutch links together, and is exceeded clutch check, it is impossible to rotate.Drive housing now is the equal of fixed body,
And input gear 8 is without driving moment, so the torque that weight is applied on gear 10 will change into axial pressing force；
When motor is started working, that is, when lifting by crane, the driving moment clockwise of motor is applied on input gear 8, defeated
Enter gear 8 drives load gear 10 to rotate by ratcheted ramp 19.According to the parameter set in design, as driving moment MQ=
During X1.MF, quiet, dynamic friction disk start it is relative slide, it is quiet, dynamic friction disk is continuously slipping as MQ=X2.MF, that is, complete lifting
Work.
Freewheel clutch also has when input gear 8 and the change of load gear 10 speed of related movement or direction of rotation change
Becoming makes the specific function of freewheel clutch combination/disengagement automatically, completes to realize that fast, conversion surmounts at a slow speed in fast feed machinery
The function of state.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (9)
1. Work brake apparatus, it is characterised in that：Including drive housing (4), main frame (5)；
The drive housing (4) is arranged on by one-way lock mechanism (3) on the axle portion part of bearing (1), and the bearing (1) is solid
Fixed, the main frame (5) is connected with drive housing (4) by the frictional disk stacked；
Input gear (8) and load gear (10) are coaxially cased with the main frame (5) of the frictional disk side；
The input gear (8) and main frame (5) are rotatably set with, and are close to frictional disk setting, the load gear (10) with
The fixed suit of main frame (5)；
The input gear (8) is provided with the first ratchet (12) of axial direction, and axial direction is relatively provided with the load gear (10)
The second ratchet (13), the ratchet (18) of first ratchet (12) and the second ratchet (13) is in axial direction mutually close to sting
Close, the ratchet is unidirectional tooth, and the inclined-plane (19) of axial thrust, the ratchet are produced while having circumferential transmitting rotary power
Inclined-plane reverse side be only circumferential passing power the ratchet back side (20)；
The locking direction of the one-way lock mechanism is consistent with the inclined-plane power direction of transfer of the ratchet.
2. Work brake apparatus according to claim 1, the one-way lock mechanism (3) is freewheel clutch, described super
More the outer ring of clutch is connected with drive housing (4), and the axle portion part of inner ring and bearing (1) is connected, at freewheel clutch both ends
The bearing (2) for rolling support is equipped between bearing (1) and drive housing (4).
3. Work brake apparatus according to claim 2, the frictional disk is sleeved on the axle of main frame (5), including quiet
Frictional disk (6) and dynamic friction disk (7), wherein, static friction disk (6) outer ring is provided with projection, is spent with the inwall of drive housing (4)
Keyway connects, and dynamic friction disk (7) inner ring is provided with internal spline, is connected with the spline of main frame (5), the static friction disk
(6) and dynamic friction disk (7) is stacked alternately to form friction pair, and is compressed by the axial force of input gear and load gear.
4. Work brake apparatus according to claim 3, the input gear (8) is provided with dish between the frictional disk of end
Shape spring (21).
5. Work brake apparatus according to claim 4, described load gear (10) one end passes through the first ratchet and second
Ratchet connection input gear (8), the other end pass through locking nut (11) axial lock.
6. Work brake apparatus according to claim 5, first ratchet (12) or the second ratchet (13) are arranged on pair
In the groove (16) for answering gear, another ratchet is arranged on the boss (17) of corresponding gear, and the boss and groove coordinate, and is realized
The closed assembly of ratchet.
7. according to the Work brake apparatus described in claim 6, the input gear (8) is rotatably set with by bushing (9)
On the axle of main frame (5).
8. according to the Work brake apparatus any one of claim 1-7, the frictional disk uses hygrometric state paper substrate friction
Material.
A kind of 9. lifting appliance of Work brake apparatus using any one of claim 1-8, it is characterised in that：Including
Power source, Work brake apparatus and hoist engine, the output shaft of the power source are connected to load brake by gear train assembly
The input gear (8) of device, the input shaft of the hoist engine are connected to the load of Work brake apparatus by gear train assembly
Gear (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239211.5A CN104832573B (en) | 2015-05-12 | 2015-05-12 | Work brake apparatus and its lifting appliance of application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239211.5A CN104832573B (en) | 2015-05-12 | 2015-05-12 | Work brake apparatus and its lifting appliance of application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104832573A CN104832573A (en) | 2015-08-12 |
| CN104832573B true CN104832573B (en) | 2017-12-26 |
Family
ID=53810674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510239211.5A Active CN104832573B (en) | 2015-05-12 | 2015-05-12 | Work brake apparatus and its lifting appliance of application |
Country Status (1)
| Country | Link |
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| CN (1) | CN104832573B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108069357A (en) * | 2016-11-14 | 2018-05-25 | 郑州飞机装备有限责任公司 | A kind of self-sustaining gear |
| CN108775347B (en) * | 2018-05-25 | 2024-01-09 | 广东机电职业技术学院 | Combined clutch |
| CN113931998A (en) * | 2021-11-01 | 2022-01-14 | 贵州航天林泉电机有限公司 | Controllable driving structure sensitive to load |
| CN114516067B (en) * | 2022-03-09 | 2024-05-31 | 清华大学 | Rope drive switching device and rope drive mechanical arm thereof |
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| GB1339049A (en) * | 1971-05-13 | 1973-11-28 | Peterson E A | Hoisting apparatus employing unitary clutch and brake assembly |
| GB1424730A (en) * | 1973-05-30 | 1976-02-11 | Arnold C H | Overrun brake |
| CN2060162U (en) * | 1989-09-18 | 1990-08-08 | 上海市建筑科学研究所 | Energy-saving retarding rise-and-fall driving device |
| CN102478086A (en) * | 2010-12-30 | 2012-05-30 | 洪涛 | Space wedge type irreversible transmission device and whole active driving lifting mechanism |
| CN103075448A (en) * | 2013-01-09 | 2013-05-01 | 孔庆堂 | Overrunning self-locking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4751989A (en) * | 1985-11-18 | 1988-06-21 | Honda Giken Kogyo Kabushiki Kaisha | Clutch with reduced dragging |
| CN101813146B (en) * | 2009-02-20 | 2012-02-15 | 湖北省咸宁三合机电制业有限责任公司 | Coupling braking load limiter |
| CN103332625B (en) * | 2013-06-28 | 2015-10-07 | 钟发忠 | A kind of clutch brake and the winch and the method for operation thereof that comprise this device |
| CN204200925U (en) * | 2014-05-14 | 2015-03-11 | 黄亮 | Novel shaft transmission device |
| CN204755677U (en) * | 2015-05-12 | 2015-11-11 | 中南大学 | Load arresting gear and equipment of using that lifts by crane thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1339049A (en) * | 1971-05-13 | 1973-11-28 | Peterson E A | Hoisting apparatus employing unitary clutch and brake assembly |
| GB1424730A (en) * | 1973-05-30 | 1976-02-11 | Arnold C H | Overrun brake |
| CN2060162U (en) * | 1989-09-18 | 1990-08-08 | 上海市建筑科学研究所 | Energy-saving retarding rise-and-fall driving device |
| CN102478086A (en) * | 2010-12-30 | 2012-05-30 | 洪涛 | Space wedge type irreversible transmission device and whole active driving lifting mechanism |
| CN103075448A (en) * | 2013-01-09 | 2013-05-01 | 孔庆堂 | Overrunning self-locking device |
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|---|---|
| CN104832573A (en) | 2015-08-12 |
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