CN109795445A - A kind of safety belt braking method and brake driven using shear thickening liquid - Google Patents
A kind of safety belt braking method and brake driven using shear thickening liquid Download PDFInfo
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- CN109795445A CN109795445A CN201910240661.4A CN201910240661A CN109795445A CN 109795445 A CN109795445 A CN 109795445A CN 201910240661 A CN201910240661 A CN 201910240661A CN 109795445 A CN109795445 A CN 109795445A
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- turntable
- shear thickening
- shear
- thickening liquid
- safety belt
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Abstract
The present invention discloses a kind of novel safety belt braking method and brake driven using shear thickening liquid.Cylinder body as shown in the picture is full of shear thickening liquid, and one end of shaft drives turntable pivoting in cylinder body, and the other end stretches out cylinder body and is connected with safety belt.It is fixed with sealing bearing and turntable in the intracorporal shaft of cylinder, normal open fluid passage is provided in turntable, normal open fluid passage will effectively be connected to the shear thickening liquid between turntable, the balanced intracorporal pressure of chamber；There are minim gaps between turntable side and cavity wall, hydraulically full, and turntable side is relatively rotated with cavity wall.The configuration parameter for modifying shear thickening liquid can be with the damping force of control system.The invention has the advantages that 1, it is simple and reliable for structure；2, the passive braking of intelligence improves safety；3, has the function of adjustable braking damping；4, braking damping force is big；5, comfort level is high；6, at low cost.
Description
Technical field
It is specifically a kind of to meet safe band brake need used for vehicle the present invention relates to a kind of practical passive braking technology
It asks and shear thickening fluid brake more reliable, more comfortable, at low cost
Background technique
Shear thickening brake is a kind of using intellectual material shear thickening liquid as the brake of working media.Shear thickening liquid
It is a kind of intellectual material of function admirable, viscosity characteristics depend on its shear strain rate, when bearing high strain-rate load, liquid
Body viscosity can be solid phase by liquid phase in very short time by dilute retrogradation, i.e. generation shear thickening behavior, and this variation is
Reversible, when load revocation, moment liquid phase can be reverted to by solid phase.Shear thickening brake is this using shear thickening liquid
Characteristic shows to be more than the characteristics of critical speed damping force steeply rises, and plays the role of braking protection.Traditional vehicles
Safe band brake need by complicated mechanical linkage, at high cost, reliability is relatively low.Compared to conventional security band system
Dynamic device, the safe band brake of shear thickening have the characteristics that passive braking, high reliablity, at low cost, comfort level is strong, is conducive to hand over
The cost control of logical tool safety belt brake also may extend to traditional low-cost safety belt field due at low cost.
Summary of the invention
For conventional security band brake complexity, high, specific condition safety declines the present invention, and problem at high cost mentions
A kind of novel safety belt braking method and its shear thickening brake out.
The technical solution of the present invention is as follows:
A kind of novel safety belt braking method, cavity is interior to be full of shear thickening liquid, and turntable is with shaft with cavity with bearing phase
Even, when safety belt is by force-extension, shaft and turntable rotation, the shearing between turntable and turntable between turntable and cavity are driven
By shear action, viscosity increases even to be solidified thickening fluid, generates resistance.Above-mentioned shear thickening liquid is consolidated as safety belt stretches
Change, curing degree enhances with the increase of shear velocity, to play braking action.
The present invention further discloses a kind of adjustable speed limit shear thickening brake for realizing the method, including shaft,
Casing wall, turntable, external screw thread, inlet opening, keyway cap, end cap, internal screw thread, shear thickening liquid, sealing bearing and sealing element；Cylinder body fills
Full shear thickening liquid, one end of shaft rotate in cylinder body under the support of two sealing bearings, and the other end stretches out cylinder body, with key
Slot cap is connected；Be fixed with several turntables in the intracorporal shaft of cylinder, turntable be solid, rigid cylindrical body, turntable side and casing wall there are
Close gap, turntable opens a cylindrical hole in the middle, as normal open fluid passage；Shaft one end is equipped with keyway, by square pin and outside
Portion's transmission device is connected.
Turntable rotation is driven from the shear thickening liquid of cylinder body shearing various concentration by shaft to realize different critical increasings
Thick rate and braking efficiency；That is: the molecular weight of the particle size and organic solvent that change dispersate can change critical thickening speed
Rate and thickening rule, the critical thickening needed under different scenes brake rate and braking efficiency to adjust dispersate and dispersion
Agent size and proportion are flexibly applied to a variety of workplaces to realize effective braking.
Turntable can also generate shear thickening effect in rotation, between turntable bottom surface, provide partial brake power supplement and
Dispersing shear stress, stress is excessive when preventing turntable lateral shear from solidifying.
When belt extraction drives shaft rotation, shear thickening liquid is just relatively rotated by parts and is sheared, when speed or answers
Power is less than in certain threshold range, and shear thickening liquid is in fluidised form, and shaft rotation and belt extraction are freely；When speed or stress
Greater than certain threshold value, shear thickening fluid viscosity increases sharply, and the output damping force of brake sharply increases, and shear thickening liquid is completely solid
Change, locks shaft rotation, make safe band brake.
Compared with prior art, the present invention its advantages are as follows:
1, the configuration of the present invention is simple is reliable, and the main function components of safe band brake are only shaft, turntable and cylinder body.Its
Turntable and shaft are the rigid bodies being fixed together, and greatly avoid the difficulty of assembly.
2, the present invention has passive braking action, plays corresponding braking effect automatically according to rotation speed change, has intelligence
Reliable advantage.
3, damping of the invention power output is not only larger but also rapid, and the power output mode of shear thickening brake is to pass through wall
Between solution shear thicken solidification, different from conventional security band mechanical pendulum brake.Braking of the invention and end of braking pine
The response time of relaxation is rapid, avoids the occurrence of conventional security band brake detent, can not relax and caused secondary injury, improves safety
Property.
Detailed description of the invention
Fig. 1 is structure of the invention figure
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.As shown in Figure 1, the present invention includes shaft 1, casing wall 2, normal open
Fluid passage 3, bolt 4, sealing bearing 5, turntable 6, shear thickening liquid 7, capping 8；Cylinder body is full of shear thickening liquid 7, one end of shaft 1
Turntable 6 is driven to rotate in cylinder body, the other end stretches out cylinder body and is connected with safety belt；Normal open fluid passage is provided on the intracorporal turntable 6 of cylinder
3, shear thickening liquid is evenly distributed in auxiliary cylinder block.
The working principle of the invention:
When external force is applied on safety belt, safety belt drives brake one end shaft and turntable to rotate relative to cylinder body
Movement, shearing motion is done relative to cavity wall in turntable side.The shear thickening liquid is in side and cavity wall, and different turntables
Viscosity changes under the shear action of bottom surface, is cured rapidly more than lane shear rate, and curing degree is with shearing speed
Degree enhancing and enhance, to keep resistance when safety belt slow stretching small, when Rapid stretching, resistance is increased rapidly, and reaches intelligent system
Dynamic effect.
It, can be by adjusting the partial size and polyethylene glycol of nano SiO 2 particle to realize different critical retardation speed
The mass ratio of molecular weight and the two makes thickening fluid viscosity change with the rule that shear velocity changes, corresponds to safety belt
Under different stretch rate, the change for the damping force size that brake generates.When safety belt is smaller by extraneous rate of extension, shearing
Thickening fluid viscosity is in smaller position, stretches easily；It when safety belt is larger by extraneous rate of extension, that is, is more than critical shear speed
The viscosity of rate, shear thickening liquid will increase sharply, and obvious solidification occur, play braking action.In addition, by adjusting shear thickening liquid
Proportion critical shear rate can be set as to a certain range of desirable value, realize the stepless changing of limitation speed, flexibly answer
For various workplaces, meet various needs.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe explains the present invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: technology
Personnel read present specification after still can with modifications or equivalent substitutions are made to specific embodiments of the invention, but this
A little modifications are changed within all without departing from the pending claims of the present patent application.
Claims (4)
1. a kind of safety belt braking method driven using shear thickening liquid, it is characterised in that: cylinder body is full of shear thickening liquid, turns
Axis drives turntable to make rotating motion relative to cavity wall, and shaft is fixedly connected with turntable, when safety belt stress stretches, brake one
The external force at end generates torque, and the shaft of brake one end is driven to make rotating motion, the shaft of brake inside and turntable relative to
Cavity wall does shearing motion, and the shear thickening liquid between turntable side and cavity wall gap and turntable and turntable is by shear action；When
When shearing motion speed or shear stress are greater than certain threshold value, the shear thickening liquid is cured under this shear action, from
And reach the function of braking；The molecule of the silica dispersed phase size of shear thickening liquid, mass ratio and polyethylene glycol dispersing agent
Control brake critical damping power, damping force peak value and damping force changing rule are measured, to play control system according to actual needs
Dynamic function.
2. a kind of safe band brake for realizing claim 1 the method, it is characterised in that shaft, casing wall, turntable, outer spiral shell
Line, inlet opening, keyway cap, end cap, internal screw thread, shear thickening liquid, sealing bearing and sealing element；Cylinder body is full of shear thickening liquid,
One end of shaft rotates in cylinder body, and the other end stretches out cylinder body and safe band connection；Turntable is fixed on the intracorporal shaft bar of cylinder
Equal rotating devices, turntable is interior to be equipped with normal open fluid apertures, and normal open fluid apertures is intercommunicated by shear thickening liquid phase in cavity；The lateral wall of turntable
Make opposite sliding between the inner sidewall of cavity, external screw thread is arranged in the shaft, and equipped with sealing bearing, sealing bearing plays liquid barrier
Effect；In shear thickening liquid silica dispersed phase size between 100nm-2um, mass fraction between 55-70%, poly- second
Glycol dispersants molecular weight is between 200-400.
3. safe band brake according to claim 2, it is characterised in that: by the shear thickening liquid for deploying different parameters
The braking that friction speed demand is realized in shear thickening effect occurs between turntable side and cavity wall and turntable；That is: titanium dioxide
Silicon size is bigger, and molecular weight polyethylene glycol is bigger, and critical shear rate decline, thickening solidification becomes apparent from, and realizes damping
The braking under different load demand and speed of device is adjusted.
4. safe band brake according to claim 2, it is characterised in that: when safety belt slow stretching, drive shaft
It is slowly rotated with turntable, shear thickening liquid is become smaller by low velocity shear effect viscosity, and damping force reduces, and shows safety belt and is pacifying
It can normal stretch under full ambient engine；When emergency braking, safety belt is rapidly stretched, and drives shaft and turntable quick rotation, and shearing increases
Magma instantaneous solidification when being acted on by high speed shear, plays braking action；When braking requirement terminates, safety belt is drawn without strong external force
It stretches, the shear action that shear thickening liquid is subject in cavity is faint, and shear thickening fluid viscosity can be returned to low viscous state, and can be easily
It slowly stretches, safety belt restores normal mode.The step-less adjustment that can realize damping force in a very short period of time, improves safety belt
Comfort, the safety belt being flexibly applied under a variety of environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240661.4A CN109795445A (en) | 2019-03-28 | 2019-03-28 | A kind of safety belt braking method and brake driven using shear thickening liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240661.4A CN109795445A (en) | 2019-03-28 | 2019-03-28 | A kind of safety belt braking method and brake driven using shear thickening liquid |
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| CN109795445A true CN109795445A (en) | 2019-05-24 |
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| CN201910240661.4A Pending CN109795445A (en) | 2019-03-28 | 2019-03-28 | A kind of safety belt braking method and brake driven using shear thickening liquid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485267A (en) * | 2019-09-03 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of adhesion type self-tuning mass damper and its application method based on shear thickening liquid |
| CN110499835A (en) * | 2019-08-30 | 2019-11-26 | 哈尔滨工业大学（深圳） | Shear thickening liquid torsional damper and its application method under a kind of low velocity impact |
| CN113062936A (en) * | 2021-03-30 | 2021-07-02 | 西北工业大学 | Safety rope brake based on shear thickening fluid and braking method |
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| CN102733175A (en) * | 2011-04-08 | 2012-10-17 | 江南大学 | Multiple dispersed phase flame retardant shear thickening fluid, its preparation method and application thereof |
| CN102899894A (en) * | 2012-05-30 | 2013-01-30 | 杭州师范大学 | Preparation method and use of shear thickening fluid |
| CN103422341A (en) * | 2012-05-15 | 2013-12-04 | 常熟宝盾高性能纤维材料制品有限公司 | Preparation method of shear thickening fluid |
| CN107826077A (en) * | 2017-12-11 | 2018-03-23 | 山东交通学院 | A kind of tight receiving apparatus of safety belt |
| CN108221382A (en) * | 2018-02-01 | 2018-06-29 | 江南大学 | A kind of electromagnetic masking shear thickening liquid and preparation method thereof |
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2019
- 2019-03-28 CN CN201910240661.4A patent/CN109795445A/en active Pending
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| CN102191680A (en) * | 2011-03-15 | 2011-09-21 | 深圳航天科技创新研究院 | Preparation method of shearing thickened fluid based on SiO2 nano-scale microspheres |
| CN102733175A (en) * | 2011-04-08 | 2012-10-17 | 江南大学 | Multiple dispersed phase flame retardant shear thickening fluid, its preparation method and application thereof |
| CN103422341A (en) * | 2012-05-15 | 2013-12-04 | 常熟宝盾高性能纤维材料制品有限公司 | Preparation method of shear thickening fluid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499835A (en) * | 2019-08-30 | 2019-11-26 | 哈尔滨工业大学（深圳） | Shear thickening liquid torsional damper and its application method under a kind of low velocity impact |
| CN110499835B (en) * | 2019-08-30 | 2024-04-19 | 哈尔滨工业大学（深圳） | Shear thickening fluid torsion damper under low-speed impact and application method thereof |
| CN110485267A (en) * | 2019-09-03 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of adhesion type self-tuning mass damper and its application method based on shear thickening liquid |
| CN113062936A (en) * | 2021-03-30 | 2021-07-02 | 西北工业大学 | Safety rope brake based on shear thickening fluid and braking method |
| CN113062936B (en) * | 2021-03-30 | 2023-02-28 | 西北工业大学 | Safety rope brake based on shear thickening fluid and braking method |
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