CN105089264B - Magnetorheological type anti-falling and anti-toppling device of lifting scaffold - Google Patents
Magnetorheological type anti-falling and anti-toppling device of lifting scaffold Download PDFInfo
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- CN105089264B CN105089264B CN201510470020.XA CN201510470020A CN105089264B CN 105089264 B CN105089264 B CN 105089264B CN 201510470020 A CN201510470020 A CN 201510470020A CN 105089264 B CN105089264 B CN 105089264B
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Abstract
The invention discloses a magnetorheological type anti-falling and anti-toppling device of lifting scaffold The two ends of the device are connected with a building wall and a lifting stand column of the lifting scaffold respectively, and the device comprises an anti-falling module, an anti-toppling module and a base; one end of the base is fixed to the building wall, and the other end of the base is connected with the lifting stand column through the anti-falling module and the anti-toppling module; the anti-falling module comprises an anti-falling support, a stepped shaft, a gear, a rack, control coils, magnetorheological fluid and end covers, and the gear is fixedly connected to the stepped shaft in a sleeving mode and meshed with the rack which is fixed to the lifting stand column; the stepped shaft is movably sleeved with the anti-falling support, the two ends of the stepped shaft both extend out of the anti-falling support and are provided with the control coils respectively; the end covers cover the control coils and are fixedly connected with the anti-falling support, and the magnetorheological fluid is stored in the confined spaces formed between the end covers and the anti-falling support. According to the device, the magnetorheological fluid characteristics and the compact structure are utilized, the anti-falling performance and anti-toppling performance of the lifting scaffold are achieved simultaneously, the adjustment and installation are facilitated, and the reliability is high.
Description
Technical field
The present invention relates to the realm of building construction, specifically refers to a kind of anti-fall anti-tilt device of magnetic rheology type of elevating scaffold.
Background technology
Magnetic flow liquid belongs to controlled fluid, is by high magnetic permeability, low hysteresis small soft magnetic particles and non-magnetic liquid
The suspended substance that body is mixed.This suspended substance presents low viscous Newtonian fluid characteristic under zero magnetic field condition；And strong
Under magnetic fields, then the Binghan bulk properties of high viscosity, lazy flow is presented.And, magnetic flow liquid is under magnetic fields
Rheology is moment, reversible, and the shear yield strength after its rheology has stable corresponding relation with magnetic field intensity, is answered
For in the devices such as damping, braking.
Attachment type raise scaffold, hereinafter referred to as elevating scaffold, it is only necessary to set up certain altitude and by adhering to thereon
Supporting construction is attached in high level, Super High engineering structure, by itself jacking equipment and device, can be constructed with engineering structure
Successively climb up to topping out, not only to meet the auxiliary construction that decoration of exterior wall job requirements are realized successively declining, also to expire
In the construction stages such as sufficient structure construction, installation, decoration construction workman outside the building side carries out operating construction technology and peace
The needs of full protection.
But, falling or inclining for elevating scaffold can cause serious loss of personal property.Though existing elevating scaffold
So there is certain anti-fall component or anti-dumping component, but complex structure, reliability are poor.Accordingly, it would be desirable to by anti-fall component and prevent
The component that inclines is organically combined, and the two synchronous working is realized, when occurring unexpected, while realizing reliability high anti-fall, anti-dumping function.
The content of the invention
The present invention improves the reliability of the anti-fall anti-dumping of elevating scaffold in order to ensure the security of building trade construction, carries
For a kind of anti-fall anti-tilt device of magnetic rheology type of elevating scaffold, using the characteristic and compact structure of magnetic flow liquid, while real
Existing elevating scaffold is anti-fall, anti-dumping, is conveniently adjusted and installs, and reliability is high.
The two ends of the present invention are connected respectively with the lifting column of construction wall, elevating scaffold, including anti-fall module, anti-dumping
Module and base；Construction wall is fixed in one end of the base, the other end by anti-fall module, anti-dumping module respectively with lifting
Column connects；The anti-fall module includes Anti-dropping rack, multidiameter, gear, tooth bar, control coil, magnetic flow liquid and end cap, tooth
Wheel is fixedly sleeved to be engaged on multidiameter and with the tooth bar being fixed on lifting column；The multidiameter and Anti-dropping rack movable sleeve
Connect, the two ends of multidiameter are stretched out Anti-dropping rack and arrange control coil；Cover in outside the end cap control coil and with anti-fall
Frame is fixedly connected, and end cap constitutes confined space with Anti-dropping rack, and magnetic flow liquid is stored in confined space.
The present invention is arranged between construction wall and the lifting column of elevating scaffold, is fixed with construction wall by base
Connection, by anti-fall module, anti-dumping module with lifted column be connected, guarantee elevating scaffold in working order under stability with
Reliability.
The gear and multidiameter be fixedly sleeved and multidiameter and Anti-dropping rack pivot bush unit, and gear can drive multidiameter one
Rise and rotate, Anti-dropping rack is realized by the engagement of wheel and rack and the connection of column is lifted, and then realize elevating scaffold
Rise, decline or hover.
The control coil, magnetic flow liquid, end cap constitute a set of magnetic flow liquid mechanism, real using the characteristic of magnetic flow liquid
Existing anti-drop function.The magnetic flow liquid mechanism is arranged on the two ends of multidiameter, the confined air formed using end cap and Anti-dropping rack
Between store magnetic flow liquid, the power in magnetic flow liquid place magnetic field is adjusted by the current value in control coil.By control
The relation that magnetic field is produced around the electric current and control coil of coil processed is common knowledge, and the improvement of the present invention do not lie in yet
This, therefore repeat no more.
When being zero by the current value of control coil or during close to zero, magnetic field residing for magnetic flow liquid is extremely weak, magnetic flow liquid
Low viscous Newtonian fluid characteristic is presented, magnetic flow liquid is flowed freely, and now gear can drive multidiameter freely to rotate；When logical
Cross control coil current value it is larger when, magnetic field residing for magnetic flow liquid is stronger, and magnetic flow liquid presents high viscosity, lazy flow
Binghan bulk properties, magnetic flow liquid in the short period of time from the good liquid of flowing be changed into Bingham semisolids and have compared with
Big shear strength, now Anti-dropping rack is connected and is provided high torque by magnetic flow liquid mechanism with multidiameter, if magnetic flow liquid
The moment of torsion that mechanism provides can rotate the moment of torsion for providing with balance gear, and then gear cannot be rotated further, if magnetic flow liquid mechanism provides
Moment of torsion more than pinion rotation provide moment of torsion then gear overcomes torque resistance to be rotated further.The process of above-mentioned magnetic current and liquid flow variation
It is moment, reversible.So, by adjust control coil current value can effective control pinion rotation speed or make gear
Stop operating, and then realize anti-drop function.
Further, the multidiameter is provided with the gear teeth, and the gear teeth stretch out the two ends of Anti-dropping rack positioned at multidiameter.
The contact area for being disposed to increase multidiameter and magnetic flow liquid of the gear teeth, when magnetic current and liquid flow is changed into half
Its shear strength can be improved during solid-state, the stability of magnetic flow liquid mechanism is further improved.
Further, the anti-fall module also includes key and axle sleeve；The multidiameter is fixedly sleeved with gear by key, leads to
Cross axle sleeve and Anti-dropping rack pivot bush unit.
The multidiameter is fixedly sleeved with gear by key, and gear is by key to multidiameter transmitting torque, bonded side
Formula is simple, stable.The multidiameter is carried out by multidiameter by axle sleeve and Anti-dropping rack pivot bush unit, Anti-dropping rack to gear
Positioning is supported, and gear can drive multidiameter to rotate together.
Further, the anti-fall module also includes circlip and sealing gasket, circlip and multidiameter clamping, sealing
Pad is arranged between circlip and Anti-dropping rack, and a side of sealing gasket is in close contact with Anti-dropping rack, axle sleeve simultaneously, sealing
The another side of pad is in close contact with circlip.
The circlip is used for spacing fixation, and further restriction multidiameter can only edge after circlip and multidiameter clamping
Axle is rotated and cannot moved along axle.
The sealing gasket is used to seal.In order that end cap forms confined space with Anti-dropping rack, can be related by improving
The machining accuracy of part is realized, but improving machining accuracy not only increases production cost but also be difficult maintenance after wearing and tearing.This
By arranging sealing gasket by the sealing gap in end cap and multidiameter institute Special composition, sealing gasket is existing product for invention,
Maintenance costs are low.
Further, the anti-fall module also includes dust cap and sealing ring；The dust cap is set on multidiameter simultaneously
Gear is covered in outward；The sealing ring is arranged on the contact surface of dust cap and multidiameter.
The dust cap one is that, for the dust-proof of gear and its connecting portion, two is, for aiding in fixed gear, to improve gear
The stability engaged with tooth bar.The diameter of the dust cap can be more than gear, by gear be wrapped in it is interior and only in gear and tooth
The engaged section of bar arranges opening；Its diameter can also be more than the external diameter of internal tooth but less than the tooth root of external tooth.The sealing ring is used for
Auxiliary is dust-proof.
Further, the anti-fall module also includes the screw plug being arranged on end cap.
For the ease of the injection of magnetic flow liquid, magnetic flow liquid is added from the hole for being opened in end cap, after the completion of fluid injection
Tightly prevent magnetic flow liquid from leaking the stopple on end cap with screw plug.
Further, the anti-dumping module includes leading arm, rotating shaft and directive wheel；One end of the leading arm is consolidated with base
Fixed connection, the other end is connected by rotating shaft with directive wheel；The directive wheel slides with the gathering sill for being arranged on lifting column side
Connection, can be along gathering sill scroll-up/down.
The leading arm is connected by rotating shaft with directive wheel, and directive wheel is connected by gathering sill with column is lifted, and makes lifting
Column is only capable of moving up and down, and effectively prevents the inclination of elevating scaffold, there is provided its stability.
Further, the gathering sill is separately positioned on the both sides for lifting column, the directive wheel being slidably connected with gathering sill
It is connected with leading arm respectively.
The gathering sill is separately positioned on the both sides of lifting column and is slidably connected with corresponding directive wheel, whole for improving
The stability of body.The gathering sill can be corresponded with directive wheel, i.e., one gathering sill is only slidably connected with a directive wheel；
Can not also correspond with directive wheel, the gathering sill for such as lifting column side is only slidably connected with a directive wheel and is lifted vertical
The gathering sill of post opposite side is slidably connected with two directive wheels simultaneously.The preferred both sides for lifting column of the invention are respectively provided with two
Gathering sill, each gathering sill one directive wheel of correspondence is simultaneously slidably connected with it.
Further, the directive wheel includes at least one point of guide wheel；The quantity of described point of guide wheel is two, and two points are led
Wheel is longitudinally disposed and in the same plane in gathering sill.
Include with stability and the reliability that column is connected, preferably one directive wheel is lifted to further enhance anti-dumping module
Two are divided to guide wheel and the upper and lower setting of two points of guide wheels is in the same plane, and two point guide wheels are embedded in gathering sill and equal simultaneously
Can independently rotate, further improve stability and reliability that directive wheel slides in gathering sill.
Further, the Anti-dropping rack, leading arm are provided with ribs.
The ribs is used to further improve overall stability.
The present invention compared with prior art, with advantages below and beneficial effect：
（1）The present invention is realized anti-fall using magnetic flow liquid characteristic, and with reference to anti-dumping module elevating scaffold can be effectively prevented
Fall or incline, reliability is high；
（2）Present configuration is compact, is easily installed, adjusts.
Description of the drawings
Fig. 1 is the structural representation of anti-fall module in the present invention.
Fig. 2 is partial enlarged drawing at A in Fig. 1.
Fig. 3 is the side view of magnetic flow liquid mechanism.
Fig. 4 is the front view of the present invention.
Fig. 5 is the top view of the present invention.
Fig. 6 is the front view of multidiameter.
Fig. 7 is that the unilateral of anti-fall module arranges front view of the invention during two points of guide wheels.
Wherein：1-base, 2-Anti-dropping rack, 3-multidiameter, 301-gear teeth, the 302-the first keyway, 303-draw-in groove,
4-gear, 5-tooth bar, 6-control coil, 7-magnetic flow liquid, 8-leading arm, 9-rotating shaft, 10-directive wheel, 1001-point
Guide wheel, 11-gathering sill, 12-key, 13-end cap, 14-screw plug, 15-dust cap, 16-sealing ring, 17-ribs,
18-axle sleeve, 19-circlip, 20-sealing gasket, 100-construction wall, 200-lift column.
Specific embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention not limited to this.
Embodiment 1：
A kind of magnetic rheology type anti-fall anti-tilt device of the elevating scaffold of the present embodiment, as shown in Figure 1, Figure 4, Figure 5, two ends
It is connected with the lifting column 200 of construction wall 100, elevating scaffold respectively, it is characterised in that：Including anti-fall module, anti-dumping mould
Block and base 1；Construction wall 100 is fixed in one end of the base 1, the other end by anti-fall module, anti-dumping module respectively with
Lift column 200 to connect；The anti-fall module includes Anti-dropping rack 2, multidiameter 3, gear 4, tooth bar 5, control coil 6, magnetic current
Become liquid 7 and end cap 13, gear 4 is fixedly sleeved to be engaged on multidiameter 3 and with the tooth bar 5 being fixed on lifting column 200；It is described
Multidiameter 3 and the pivot bush unit of Anti-dropping rack 2, the two ends of multidiameter 3 are stretched out Anti-dropping rack 2 and arrange control coil 6；The end
Cover in control coil 6 and be fixedly connected with Anti-dropping rack 2 outside lid 13, end cap 13 constitutes confined space with Anti-dropping rack 2, magnetorheological
Liquid 7 is stored in confined space；The multidiameter 3 is provided with the gear teeth 301, and the gear teeth 301 stretch out Anti-dropping rack 2 positioned at multidiameter 3
Two ends；The anti-fall module also includes key 12, axle sleeve 18, circlip 19, sealing gasket 20, dust cap 15, the and of sealing ring 16
Screw plug 14 on end cap 13；The multidiameter 3 by key 12 it is fixedly sleeved with gear 4, by axle sleeve 18 with anti-fall
The pivot bush unit of frame 2；The circlip 19 and the clamping of multidiameter 3, sealing gasket 20 be arranged on circlip 19 and Anti-dropping rack 2 it
Between, a side of sealing gasket 20 is in close contact with Anti-dropping rack 2, axle sleeve 18 simultaneously, another side and the elasticity gear of sealing gasket 20
Circle 19 is in close contact；The dust cap 15 is set on multidiameter 3 and covers in outward gear 4；The sealing ring 16 is arranged on dust-proof
The contact surface of lid 15 and multidiameter 3.
As shown in Figure 2 and Figure 3, the control coil 6, magnetic flow liquid 7, end cap 13 constitute a set of magnetic flow liquid mechanism, utilize
The characteristic of magnetic flow liquid, realizes anti-drop function.The magnetic flow liquid mechanism is arranged on the two ends of multidiameter 3, using end cap 13 with
The confined space storage magnetic flow liquid 7 that Anti-dropping rack 2 is formed, by the current value in control coil 6 to the place magnetic of magnetic flow liquid 7
The power of field is adjusted.
As shown in fig. 6, multidiameter 3 is provided with the gear teeth 301, the first keyway 302, draw-in groove 303；The gear teeth 301 are located at rank
Terraced axle 3 stretches out the two ends of Anti-dropping rack 2, for strengthening the rheology of magnetic flow liquid 7 for the shearing force born after semisolid；It is described
First keyway 302 is used to fixedly mount key 12；The draw-in groove 303 is used to position fixed circlip 19.
Embodiment 2：
A kind of magnetic rheology type anti-fall anti-tilt device of the elevating scaffold of the present embodiment, as shown in Figure 1, Figure 4, Figure 5, two ends
It is connected with the lifting column 200 of construction wall 100, elevating scaffold respectively, it is characterised in that：Including anti-fall module, anti-dumping mould
Block and base 1；Construction wall 100 is fixed in one end of the base 1, the other end by anti-fall module, anti-dumping module respectively with
Lift column 200 to connect；The anti-fall module includes Anti-dropping rack 2, multidiameter 3, gear 4, tooth bar 5, control coil 6, magnetic current
Become liquid 7 and end cap 13, gear 4 is fixedly sleeved to be engaged on multidiameter 3 and with the tooth bar 5 being fixed on lifting column 200；It is described
Multidiameter 3 and the pivot bush unit of Anti-dropping rack 2, the two ends of multidiameter 3 are stretched out Anti-dropping rack 2 and arrange control coil 6；The end
Cover in control coil 6 and be fixedly connected with Anti-dropping rack 2 outside lid 13, end cap 13 constitutes confined space with Anti-dropping rack 2, magnetorheological
Liquid 7 is stored in confined space；The multidiameter 3 is provided with the gear teeth 301, and the gear teeth 301 stretch out Anti-dropping rack 2 positioned at multidiameter 3
Two ends；The anti-fall module also includes key 12, axle sleeve 18, circlip 19, sealing gasket 20, dust cap 15, the and of sealing ring 16
Screw plug 14 on end cap 13；The multidiameter 3 by key 12 it is fixedly sleeved with gear 4, by axle sleeve 18 with anti-fall
The pivot bush unit of frame 2；The circlip 19 and the clamping of multidiameter 3, sealing gasket 20 be arranged on circlip 19 and Anti-dropping rack 2 it
Between, a side of sealing gasket 20 is in close contact with Anti-dropping rack 2, axle sleeve 18 simultaneously, another side and the elasticity gear of sealing gasket 20
Circle 19 is in close contact；The dust cap 15 is set on multidiameter 3 and covers in outward gear 4；The sealing ring 16 is arranged on dust-proof
The contact surface of lid 15 and multidiameter 3；The anti-dumping module includes leading arm 8, rotating shaft 9 and directive wheel 10；The one of the leading arm 8
End is fixedly connected with base 1, and the other end is connected by rotating shaft 9 with directive wheel 10；The directive wheel 10 be arranged on lifting column
The gathering sill 11 of 200 sides is slidably connected, can be along the scroll-up/down of gathering sill 11；The gathering sill 11 is separately positioned on lifting column
200 both sides, the directive wheel 10 being slidably connected with gathering sill 11 is connected respectively with leading arm 8；The directive wheel 10 is included at least
One point of guide wheel 1001；The quantity of described point of guide wheel 1001 is two, and two points of guide wheels 1001 are longitudinally disposed and positioned at gathering sill
In same plane in 11；The Anti-dropping rack 2, leading arm 8 are provided with ribs 17.
As shown in fig. 7, the gathering sill 11 is separately positioned on the both sides for lifting column 200, it is slidably connected with gathering sill 11
Directive wheel 10 be connected with leading arm 8 by rotating shaft 9 respectively；The directive wheel 10 includes at least one point of guide wheel 1001；It is described
The quantity for being divided to guide wheel 1001 is two, and two points of guide wheels 1001 are longitudinally disposed and in the same plane in gathering sill 11.
The above, is only presently preferred embodiments of the present invention, not does any pro forma restriction to the present invention, it is every according to
According to any simple modification, equivalent variations that the technical spirit of the present invention is made to above example, the protection of the present invention is each fallen within
Within the scope of.
Claims (10)
1. the anti-fall anti-tilt device of a kind of magnetic rheology type of elevating scaffold, two ends respectively with construction wall（100）, elevating scaffold
Lifting column（200）Connection, it is characterised in that：Including anti-fall module, anti-dumping module and base（1）；The base（1）One
Construction wall is fixed at end（100）, the other end by anti-fall module, anti-dumping module respectively with lifted column（200）Connection；It is described
Anti-fall module includes Anti-dropping rack（2）, multidiameter（3）, gear（4）, tooth bar（5）, control coil（6）, magnetic flow liquid（7）And end
Lid（13）, gear（4）It is fixedly sleeved in multidiameter（3）It is upper and be fixed on lifting column（200）On tooth bar（5）Engagement；Institute
State multidiameter（3）With Anti-dropping rack（2）Pivot bush unit, multidiameter（3）Two ends stretch out Anti-dropping rack（2）And control line is set
Circle（6）；The end cap（13）Control coil is covered in outward（6）And and Anti-dropping rack（2）It is fixedly connected, end cap（13）With Anti-dropping rack
（2）Constitute confined space, magnetic flow liquid（7）In being stored in confined space.
2. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 1, it is characterised in that：It is described
Multidiameter（3）It is provided with the gear teeth（301）, the gear teeth（301）Positioned at multidiameter（3）Stretch out Anti-dropping rack（2）Two ends.
3. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 2, it is characterised in that：It is described
Anti-fall module also includes key（12）And axle sleeve（18）；The multidiameter（3）By key（12）With gear（4）It is fixedly sleeved, pass through
Axle sleeve（18）With Anti-dropping rack（2）Pivot bush unit.
4. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 3, it is characterised in that：It is described
Anti-fall module also includes circlip（19）And sealing gasket（20）, circlip（19）With multidiameter（3）Clamping, sealing gasket（20）
It is arranged on circlip（19）With Anti-dropping rack（2）Between, sealing gasket（20）A side simultaneously and Anti-dropping rack（2）, axle sleeve
（18）It is in close contact, sealing gasket（20）Another side and circlip（19）It is in close contact.
5. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 3, it is characterised in that：It is described
Anti-fall module also includes dust cap（15）And sealing ring（16）；The dust cap（15）It is set in multidiameter（3）Cover in above and outward
Gear（4）；The sealing ring（16）It is arranged on dust cap（15）With multidiameter（3）Contact surface.
6. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 3, it is characterised in that：It is described
Anti-fall module also includes the screw plug being arranged on end cap.
7. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 1-6 any one, it is special
Levy and be：The anti-dumping module includes leading arm（8）, rotating shaft（9）And directive wheel（10）；The leading arm（8）One end and bottom
Seat（1）It is fixedly connected, the other end passes through rotating shaft（9）With directive wheel（10）Connection；The directive wheel（10）Stand with being arranged on to be lifted
Post（200）The gathering sill of side（11）It is slidably connected, can be along gathering sill（11）Scroll-up/down.
8. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 7, it is characterised in that：It is described
Gathering sill（11）It is separately positioned on lifting column（200）Both sides, with gathering sill（11）The directive wheel being slidably connected（10）Respectively
With leading arm（8）Connection.
9. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 8, it is characterised in that：It is described
Directive wheel（10）Including at least one point of guide wheel（1001）；Described point of guide wheel（1001）Quantity be two, two points of guide wheels
（1001）It is longitudinally disposed and positioned at gathering sill（11）In same plane in.
10. the anti-fall anti-tilt device of magnetic rheology type of a kind of elevating scaffold according to claim 7, it is characterised in that：Institute
State Anti-dropping rack（2）, leading arm（8）It is provided with ribs（17）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510470020.XA CN105089264B (en) | 2015-08-04 | 2015-08-04 | Magnetorheological type anti-falling and anti-toppling device of lifting scaffold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510470020.XA CN105089264B (en) | 2015-08-04 | 2015-08-04 | Magnetorheological type anti-falling and anti-toppling device of lifting scaffold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105089264A CN105089264A (en) | 2015-11-25 |
| CN105089264B true CN105089264B (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510470020.XA Expired - Fee Related CN105089264B (en) | 2015-08-04 | 2015-08-04 | Magnetorheological type anti-falling and anti-toppling device of lifting scaffold |
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| CN (1) | CN105089264B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110206152B (en) * | 2019-06-04 | 2021-06-25 | 中原工学院 | Universal joint structure of steel structure X-beam Y-shaped column |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916736A (en) * | 1988-06-07 | 1990-04-10 | Macrovision Corporation | Method and apparatus for encrypting and decrypting time domain signals |
| CN2189143Y (en) * | 1993-04-19 | 1995-02-08 | 仲建元 | Skid-proof lifting machine |
| CN2290586Y (en) * | 1996-12-09 | 1998-09-09 | 仲建元 | Anti-falling device of lifting equipment |
| CN2416081Y (en) * | 2000-03-21 | 2001-01-24 | 蒋志明 | Device for floor-levelling for construction elevator |
| CN204804306U (en) * | 2015-08-04 | 2015-11-25 | 四川建筑职业技术学院 | Magnetic current variant anti -falling anti -roll device of lift scaffold |
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Granted publication date: 20170510 Termination date: 20210804 |