CN109925164A - The Nei Zu mechanism based on rope driving for lower limb rehabilitation robot - Google Patents
The Nei Zu mechanism based on rope driving for lower limb rehabilitation robot Download PDFInfo
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Abstract
A kind of Nei Zu mechanism based on rope driving for lower limb rehabilitation robot, including hip joint, big leg mechanism, knee joint and small leg mechanism, the big leg mechanism includes thigh bar and the thigh power-assisted plate for fixing thigh, the thigh power-assisted plate is mounted on the inside of thigh bar, the small leg mechanism includes shank bar and the shank power-assisted plate for fixing shank, the shank power-assisted plate is mounted on the inside of shank bar, the shank power-assisted plate and thigh power-assisted plate are arc, the upper end of the thigh bar is connected by hip joint and the waist structure of rack, the lower end of the thigh bar is connect by knee joint with the upper end of shank bar；The knee joint includes thigh runner, shank runner, two arc link blocks, two knee joint cotton ropes and knee joint driving motor.The present invention provides a kind of Nei Zu mechanisms based on rope driving for lower limb rehabilitation robot, can be harmonious with the gait of people, can preferably realize the coupling between man-machine.
Description
Technical field
The present invention relates to healing robot technical field, more particularly, to it is a kind of for lower limb rehabilitation robot based on rope
The Nei Zu mechanism of driving.
Background technique
Healing robot is a kind of novel robot occurred in recent years, as an important branch of medical robot,
It is all that his research has run through medical science of recovery therapy, mechanics, mechanics, materialogy, mathematical analysis, finite element simulation and robotics etc.
It is multi-field, have become a hot spot of international robot field's research.In recent years, due to economic rapid development, traffic
Means of transport increases rapidly, and the linear number of limb injury is caused to rise because of traffic accident.Meanwhile with living standards of the people
Raising, China with it is many country as, stepping into aging.According to statistics, China 60 years old i.e. more than population existing 2.22
The 16.5% of hundred million, Zhan Quanguo population.There are a large amount of cardiovascular and cerebrovascular disease or patient with nervous system disease in the elderly masses, this
Class most patients are with hemiplegia symptom.The number that hemiplegia occurs in the middle-aged and the old for suffering from cardiovascular and cerebrovascular disease at present is increasing, and
And rejuvenation trend is presented in the age.Theory of medicine and clinical medicine proves, operative treatment and necessity of this kind of patient in addition to early stage
Drug therapy outside, correctly, science rehabilitation training critically important effect is played for the recovery of extremity motor function.As early as possible
Range of motion can not only be maintained by carrying out rehabilitation training, prevent the contracture of joint, and can significantly improve patient motion function
Final recovery extent.
Currently, in China, although rehabilitation engineering has obtained universal attention, but healing robot research is still in rising
Step section.China's rehabilitation project achieved certain achievement at a aspect in recent years, especially in technology content is less high
Such as rehabilitation appliances development of shelves product is very fast.
Zhejiang University's electromechanics has developed wearable artificial limb, which is dedicated to developing a set of for enhancing human body
The wearable artificial leg of walking ability, he introduces major part of the people as entire control system, can alleviate people by
The physical fatigue caused by excessive double feet walking.Currently, the prototype test system of a set of lower limb has been developed, for testing
It demonstrate,proves some theoretical results and is followed successively by the experimental study that platform carries out next stage.
Electromechanical Engineering and Automation College, Shanghai Univ. has also begun one's study a set of wearable power-assisted pedipulator, under unilateral
Limb there are two freedom degree, respectively hip joint and it is kneed bend and stretch freedom degree, the two freedom degrees have electric cylinder driving respectively.
Massachusetts Institute Technology has developed famous PAMM system, including intelligent walking machine and intelligent walking stick device, system benefit
Use force sensor as main input interface, the driving wheel of drive system bottom, to realize the function of user's walking.For
Solve the problems, such as that wearing is inconvenient, Japanese honda company designs Intelligent lower limb force aid system, this to be worn on figure nude mechanical device
The insufficient the elderly of muscle strength can be helped to improve the speed of travel, extend travel distance, improve march in step.
By the analysis to existing similar products in the market, we are summarized as follows:
1. mass is excessive, lead to the problem that volume is excessive, clumsy in one's movement.It is walked due to healing robot in power-assisted user
Required freedom degree is excessive in the process, and the number of motors of most product additions is excessive, thus leads to control difficulty, volume mistake
Greatly, a series of problems, such as noise, comfort level.
2. adaptive ability is inadequate, learning ability is poor.To preferably achieve the purpose that rehabilitation training, learn user's
Walking rule and habit, while it is essential for providing different size of power-assisted according to the situation robot of user's different phase
's.
3. the delay of signal transmission causes the expection performance of a different dive with operator to be closed.SEMG sensor and pressure are mostly used at present
Force snesor, signal are transferred to after central processing unit by analysis, then operational order are sent out, and thus lead to the stagnant of signal
Problem afterwards.
Summary of the invention
In order to overcome the shortcomings of the prior art, the present invention provides a kind of for lower limb rehabilitation robot based on rope
The Nei Zu mechanism of driving, can be harmonious with the gait of people, can preferably realize the coupling between man-machine.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of Nei Zu mechanism based on rope driving for lower limb rehabilitation robot, including hip joint, big leg mechanism, knee close
Section and small leg mechanism, the big leg mechanism includes thigh bar and the thigh power-assisted plate for fixing thigh, the thigh power-assisted plate
It is mounted on the inside of thigh bar, the small leg mechanism includes shank bar and the shank power-assisted plate for fixing shank, the shank
Power-assisted plate is mounted on the inside of shank bar, and the shank power-assisted plate and thigh power-assisted plate are arc, the upper end of the thigh bar
It is connected by hip joint and the waist structure of rack, the lower end of the thigh bar is connect by knee joint with the upper end of shank bar；
The hip joint includes upper and lower two pieces of plates, three curve connecting rods, three spherical hinges, three universal joints, four hips
Joint cotton rope and two hip joint driving motors, three universal joint equal circumference are arranged in the planar bottom surface of upside, three flexural pivots
Dislocation is arranged up and down and equal circumference is arranged on the plate top surface of downside for chain and three universal joints, and three universal joints pass through three respectively
The universal joint of root curve connecting rod and three flexural pivot chain links, the connection of every curve small end is connect with the root curve connecting rod lower end
Spherical hinge mapping be centrosymmetric in the same plane arrangement；The surrounding of upper and lower two pieces of plates is respectively equipped with four line wheels,
Line wheel on two pieces of plates of upper and lower the same side by a hip joint cotton rope connection, fix by one end of hip joint cotton rope,
The motor shaft of the other end and hip joint driving motor synchronizes, and two hip joint cotton ropes being symmetrical set share a hip
Joint drive motor, two hip joint cotton ropes that front and back is arranged symmetrically share another hip joint driving motor, two hip joints
Driving motor is mounted on rack waist structure；Upside plate top surface is mounted on waist structure, the bottom surface installation of lower flat
In the upper end of thigh bar；
The knee joint includes thigh runner, shank runner, two arc link blocks, two knee joint cotton ropes and knee joint
Driving motor, the thigh runner and shank runner are tangent always and be arranged between two arc link blocks, and two arcs connect
The upper and lower ends for connecing block pass through a rotation axis connection respectively, and the thigh runner is rotatably installed by thigh A-frame
In the rotation axis for being located at upside, the thigh A-frame is fixed on the lower end of thigh bar, and the shank runner passes through shank
A-frame is rotatably mounted in the rotation axis of downside, and shank A-frame is fixed on the upper end of shank bar, described
Two spring connecting columns, two spring connecting columns point are respectively set in the front of thigh A-frame and the front of shank A-frame
It is not arranged symmetrically in the left and right sides of corresponding runner, the shank of each spring connecting column and the same side on thigh A-frame
Spring connecting column on A-frame passes through knee joint reset spring respectively and connects；
Two line wheels, two line wheels point are respectively set in the rear portion of the thigh A-frame and the rear portion of shank A-frame
It is not arranged symmetrically in the left and right sides of corresponding runner；A line wheel is respectively symmetrically equipped at left and right sides of the lower end of thigh bar,
Line wheel that one end of every knee joint cotton rope is wound on shank A-frame is simultaneously fixed in the line wheel, and the other end is around being located at
After line wheel on the thigh A-frame of the same side, further around the line wheel returned on shank A-frame, it is then passed through big crural triangle branch
It upwardly extends after the line wheel in line wheel, thigh bar on frame close to thigh bar, is closed after two knee joint cotton ropes upwardly extend with knee
Driving motor synchronous interaction is saved, knee joint driving motor is mounted on the waist structure of rack.
Further, it is equipped with arc convex in the middle part of the edge of the thigh runner, is set in the middle part of the edge of the shank runner
There is arc groove, the arc convex is engaged with arc groove.
Further, the thigh bar is rectangular shaft, and thigh power-assisted plate is equipped with the rectangle for being sleeved on thigh bar
Pipe, the shank bar are rectangular shaft, and shank power-assisted plate is equipped with the rectangular tube for being sleeved on shank bar.
Beneficial effects of the present invention are mainly manifested in:
(1) present invention can be harmonious with the gait of people, can satisfy the base that lower limb rehabilitation patient walks on level land
This gait, Liang Neizu mechanism can be consistent with the leg exercise situation of people, can preferably realize the coupling between man-machine；
(2) present invention is all made of Flexible Transmission in the design of the joint of Liang Neizu mechanism, using Flexible Transmission feature,
Motor is concentrated on rack waist structure, convenient for the preferred arrangement of circuit；
(3) present invention uses parallel institution at the hip joint of Liang Neizu mechanism, realizes three-degree-of-freedom motion, has Gao Gang
The characteristic of degree, high-bearing capacity, high dynamic performance, occupy little space advantage.
Detailed description of the invention
Fig. 1 is the rearview of lower limb rehabilitation robot.
Fig. 2 is the side view of lower limb rehabilitation robot.
Fig. 3 is the three-dimensional figure of Nei Zu mechanism.
Fig. 4 is the rearview of Fig. 5.
Fig. 5 is the knee joint three-dimensional figure of Nei Zu mechanism.
Fig. 6 is the knee joint installation diagram of Nei Zu mechanism.
Fig. 7 is knee joint partial enlarged view.
Fig. 8 is hip joint omnidirectional mechanism three-dimensional figure.
Fig. 9 is hip joint omnidirectional mechanism installation diagram.
Figure 10 is from upper vertical view, universal joint, spherical hinge layout drawing.
Figure 11 is line wheel winding mode figure at hip joint.
Figure 12 is thigh power-assisted plate three-dimensional figure.
Figure 13 is the side view of Figure 12.
Figure 14 is human leg's muscle model figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig.1~Figure 14, a kind of Nei Zu mechanism based on rope driving for lower limb rehabilitation robot, including hip close
Section, big leg mechanism, knee joint and small leg mechanism, the big leg mechanism include thigh bar and the thigh power-assisted for fixing thigh
Plate, the thigh power-assisted plate are mounted on the inside of thigh bar, and the small leg mechanism includes shank bar and for fixing the small of shank
Leg power-assisted plate, the shank power-assisted plate are mounted on the inside of shank bar, and the shank power-assisted plate and thigh power-assisted plate are arc,
The upper end of the thigh bar is connected by the waist structure of hip joint and rack, the lower end of the thigh bar by knee joint with it is small
The upper end of leg bar connects；
The hip joint include 26, three, the curve connecting rod of upper and lower two pieces of plates 23, three spherical hinge, three universal joints 24,
Four hip joint cotton ropes and two hip joint driving motors, three 24 equal circumference of universal joint are arranged in the planar bottom surface of upside,
Dislocation is arranged up and down and equal circumference is arranged on the plate top surface of downside for three spherical hinges and three universal joints, three universal joints point
Not Tong Guo three curve connecting rods 26 and three flexural pivot chain links, every curve small end connection universal joint and the root curve connect
The spherical hinge of bar lower end connection maps the arrangement that is centrosymmetric in the same plane；The surrounding of upper and lower two pieces of plates 23 is set respectively
There are four line wheels, and the line wheel on two pieces of plates of upper and lower the same side passes through a hip joint cotton rope connection, hip joint cotton rope
One end fix, the motor shaft of the other end and hip joint driving motor synchronizes, two hip joint lines being symmetrical set
It restricts and shares a hip joint driving motor, two hip joint cotton ropes that front and back is arranged symmetrically share another hip joint driving electricity
Machine, two hip joint driving motors are mounted on rack waist structure；Upside plate top surface is mounted on waist structure, and downside is flat
The bottom surface of plate is mounted on the upper end of thigh bar；
The knee joint includes thigh runner 18,20, two arcs 19, two knee joint cotton ropes of connection of shank runner and knee
Joint drive motor, the thigh runner 18 and shank runner 20 are tangent always and be arranged between two arc link blocks 19,
The upper and lower ends of two arc link blocks 19 pass through a rotation axis connection respectively, and the thigh runner 18 passes through big crural triangle branch
Frame is rotatably mounted in the rotation axis 16 of upside, and the thigh A-frame is fixed on the lower end of thigh bar, described
Shank runner 20 is rotatably mounted in the rotation axis 22 of downside by shank A-frame, and shank A-frame is fixed
In the upper end of shank bar, the front of the thigh A-frame is respectively set two springs with the front of shank A-frame and connects
Column, two spring connecting columns are symmetrically arranged at the left and right sides of corresponding runner, each spring on thigh A-frame
Connecting column 17 is connect by knee joint reset spring respectively with the spring connecting column 21 on the shank A-frame of the same side；
Two line wheels, two line wheels point are respectively set in the rear portion of the thigh A-frame and the rear portion of shank A-frame
It is not arranged symmetrically in the left and right sides of corresponding runner；A line wheel is respectively symmetrically equipped at left and right sides of the lower end of thigh bar
15, line wheel 13 that one end of every knee joint cotton rope is wound on shank A-frame is simultaneously fixed in the line wheel 13, the other end
After the line wheel 14 on the thigh A-frame for being located at the same side, further around the line wheel 13 returned on shank A-frame, then pass through
It is upwardly extended after the line wheel 15 in line wheel 14, thigh bar on excessive crural triangle bracket close to thigh bar, two knee joint cotton ropes
It is synchronized after upwardly extending with knee joint driving motor, knee joint driving motor is mounted on the waist structure of rack.
Further, arc convex is equipped in the middle part of the edge of the thigh runner 18, in the edge of the shank runner 20
Portion is equipped with arc groove, and the arc convex is engaged with arc groove.
Further, the thigh bar is rectangular shaft, and thigh power-assisted plate is equipped with the rectangle for being sleeved on thigh bar
Pipe, the shank bar are rectangular shaft, and shank power-assisted plate is equipped with the rectangular tube for being sleeved on shank bar.
Lower limb rehabilitation robot include rack and it is rack-mounted four for play a supportive role exopodal mechanism,
Two Nei Zu mechanisms and sport monitoring device based on rope driving, the rack include platform and are arranged in the middle part of platform and can cover
Waist structure at user waist, is arranged in the left and right sides of waist structure in four exopodal mechanisms in pairs, and two
Group exopodal mechanism is symmetrically arranged, one group of exopodal mechanism front-back staggered and mirror-image arrangement of the same side, and Liang Geneizu mechanism is left
The right side is arranged symmetrically and is arranged between Liang Zu exopodal mechanism；Four exopodal mechanisms integrally form a linkage mechanism, each exopodal
Mechanism only needs a motor, totally four motors, and is integrated in the waist location of rack；
The sport monitoring device includes the silica gel module and central processing unit for measuring articulation angle, the silicon
Rubber moulding block is arranged on kneed rear side, including fibre optical sensor and flexible plate, the fibre optical sensor are embedded into flexibility
In bottom plate, the upper and lower ends of flexible plate are connect with thigh A-frame, shank A-frame respectively, the fibre optical sensor with
Central processing unit connection, the central processing unit are connect with knee joint driving motor and two hip joint driving motors.Silicon moulds
Knee joint and hip joint movement are controlled after block detection after signal is transferred to central processing.
As shown in Figure 3 and Figure 4, Liang Tiaoneizu mechanism in left and right is respectively there are three motor, wherein at hip joint there are two, knee joint
Place has one, guarantees the freedom degree on different directions.In the process of walking, left foot or right crus of diaphragm are first stepped, at this time hip joint forward swing,
It is put after knee joint, the state of an anterior arch is presented in left leg, and center of gravity is located on right leg, and right rear left-leg lifts while knee joint forward swing is left
Leg, which stretches, to stride forward, and center of gravity starts to shift, and right leg starts to be bent, and one in front and one in back, center of gravity is transferred to left leg to left and right leg, then right
Leg strides forward, lands the walking for completing a step.The present invention is exactly the gait that maximized simulation people walks, and is detected in sensor
To after corresponding signal, feedback arrives leg after central processing unit identifying processing, is driven by motor, have on power-assisted plate one it is corresponding
Power help leg muscle inability user complete lift leg act.
As shown in Figure 5 and Figure 6, fixing end constraint, phase between the two are formed between big leg mechanism and arc link block 19
Constant to position, i.e., arc link block 19 is not rotated around rotation axis 16.Thigh runner 18 and shank runner 20 are during rotation
Remain tangent state.Two arc link blocks 19 both pass through corresponding A-frame, Mei Gezhuan to lordosis, every rotation axis
Wheel is fixed on corresponding A-frame, and each A-frame is fixedly connected with corresponding mechanism respectively；
Kneed movement control mode is as described below, uses flexible drive at knee joint, i.e., by line wheel and cotton rope come
The bending control for realizing joint, by the flexible deformation reset function of knee joint reset spring, realizes the upright function in joint.Institute
Line wheel coiling arrangement is stated as shown in fig. 6, knee joint cotton rope is wound on first in line wheel 13, and is fixedly connected with line wheel 13, then around
Wire-crossing wheel 14, hereafter winding mode be similar to movable pulley in coiling, in wraparound line wheel 13, from line wheel 13 from line draw after,
Around wire-crossing wheel 14, line realizes the change in vertical direction after wire-crossing wheel 15, and is close to thigh bar and extends to rack waist
It is connect with knee joint driving motor.Line wheel at knee joint two is all arranged symmetrically, as shown in fig. 7, and winding mode also phase
Together.Specific control mode is as described below, by the rotation of control knee joint driving motor realize tension to knee joint cotton rope with
Relaxation, and then realize kneed bending motion, specific control mode is as follows, and when knee joint driving motor rotates forward, cotton rope is drawn
Tightly, the distance between line wheel 13 and line wheel 14 shorten, small leg mechanism rotate moving axis 22 rotation, realize kneed flexure operation,
The distance of the intercolumniation of spring connection at this time becomes larger, and the knee joint reset spring being attached thereto is in tensional state；When knee joint drives
When motor reversal, cotton rope is in relaxed state, under the action of knee joint reset spring, between spring connecting column 17,21 away from
From shortening, the distance between line wheel 13 and line wheel 14 increase, and the small leg mechanism moving axis 22 that rotates rotates backward, and are restored to vertical
State realizes kneed homing action.It can be set on the motor shaft of knee joint driving motor there are two the line wheel moved synchronously, be used
In connecting two knee joint cotton ropes, the movement of a motor synchronous drive both threads rope is realized.
As shown in fig. 7, A-frame forms sector structure with corresponding runner, hour angle is swung up for completing front and back
The control of degree, therefore there are two line wheels in the end symmetric of sector structure arrangement.
Intermediate Liang Neizu mechanism based on rope driving refers to the main part of lower limbs rehabilitation training robot, that is, with
Two foot of centre that two leg of people combines.The modelling of interior two foot is mainly to include based on human leg's modelling
Four hip joint, big leg mechanism, knee joint and small leg mechanism parts.By the collective effect of four parts, two is sufficient in robot
It can complete the common mating reaction generation between that is, big leg mechanism, small leg mechanism and knee joint with the consistent movement in people leg
Bending unbending movement, go back organic frame, hip joint and big leg mechanism cooperation hip joint Three Degree Of Freedom rotate.The hip closes
Section and knee joint are all made of the mode of rope driving to realize corresponding function, reduce and drive number of motors, convenient for will be all
Driving motor is integrated in one piece.
The big leg mechanism and small leg mechanism, similar in the two construction profile and function, power-assisted plate global shape is in four points
Three ellipse, be closely linked at work by bandage and people's leg, primarily serve the effect of fixing wearing and help
Push dynamic two effects.
The knee joint can satisfy the freedom degree on front-rear direction, by two it is equal in magnitude being capable of intermeshing runner
It is located at the bottom of big leg mechanism and the top of small leg mechanism.On arc convex and shank runner on thigh runner
Arc groove engagement, to which guarantor is during lifting leg, shank can be followed greatly with determining angle for the mechanism of similar gear
Leg is without deviation.
Knee joint is the significant points for connecting shank and thigh, is connected by kneecap with the facies patellaris of femur, the medial and lateral of femur
Condyle is opposite with the medial and lateral condyle of shin bone respectively.Make shank with respect to thigh swing by ligament tension, as long as a freedom
Degree, the angle that most of rehabilitation training person swings are 60 degree.
As shown in Figure 8 and Figure 9,25 be the line wheel on the plate of upside, and 27 be the line wheel on lower flat；Hip joint is with respect to knee
Side-sway requirement for joint on more left and right directions, requires to use universal joint based on this, flexible and changeable.The hip
Joint is connected upper and lower two pieces of plates using curve connecting rod and spherical hinge, forms the parallel institution of Three Degree Of Freedom.Upper and lower two
Block plate is connect with the thigh bar of rack waist structure, Nei Zu mechanism respectively.Spherical hinge and curve connecting rod are fixed, and realize that two is free
The movement of degree.Line wheel is fixed together with plate, is arranged on four sides of square plate, between upper and lower two pieces of plates
Line wheel transmission is realized by knee joint cotton rope.
Hip joint is the position for connecting thigh and trunk, and hip joint is made of femoral head and acetabular bone, belongs to cup-and-ball joint,
It is typical bar mortar joint.Make thigh with respect to body front and back by ligament tension and swing, does not consider the micro- of rehabilitation period
Weak rotation, it is believed that there are two freedom degree, most of rehabilitation clients trainer swing and the angle that swings be respectively 50 degree with
20 degree.
As shown in Figure 10, circle represents spherical hinge, and cross represents universal joint；In lower flat center and certain
Uniformly distributed three spherical hinges on the circumference of radius, uniformly distributed three universal joints on the circumference of same radius at the plate center of upside,
So that upper following table central point is overlapped when from surface, corresponding universal joint, spherical hinge are bowed about center point symmetry from above
Depending on universal joint, spherical hinge arrange following Figure 10.Line wheel is evenly arranged on the surrounding of upper and lower two pieces of plates.
Two freedom degrees at hip joint to the tensioning of hip joint cotton rope and are unclamped real by two hip joint driving motors
It is existing, line wheel is housed, the cotton rope drawn at line wheel extends to hip joint by the directive wheel of other joints, on hip joint on motor
There is smooth chamfering aperture at plate, cotton rope introduces hip joint, line wheel winding mode such as Figure 11 at hip joint from the hole.
Hip joint steering principle is similar with pulley blocks principle, example: when hip joint driving motor rotates forward, line wheel thereon is just
Turn, cotton rope is tensioned at line wheel on one side, and in the case where tensile force acts on, distance becomes smaller between line wheel above and below the face, line at lower flat
Wheel is close upwards, and line unclamps at its opposite line wheel, and tensile force becomes smaller, the spacing of the line wheel up and down on opposite under tensile force effect
From becoming larger, line wheel is far from line wheel at the plate of upside at lower flat.It realizes in two opposite face line wheels effect hypozygal to a side
To rotation.Similarly, it can be realized the rotation to another direction in its adjacent surface line wheel effect hypozygal.
Two line wheels can be set on the motor shaft of one hip joint driving motor, realized for two hip joint cotton ropes same
Step movement, two hip joint driving motors can be arranged up and down, arrange between motor shaft in right-angled intersection；Every hip joint cotton rope
One end can be fixed in the line wheel of motor, the other end of cotton rope passes through aperture on the plate of upside, by the plate of upside
Line wheel, around the line wheel on lower flat, by the line wheel other side, another small on the plate of upside on the plate of upside
Hole is fixed in a line wheel on the motor shaft of corresponding hip joint driving motor.
As shown in Figure 12 and Figure 13, power-assisted plate is integrally an oval mechanism.
The power transmission of Nei Zu mechanism of the invention is realized by cotton rope transmission.The structure of cotton rope transmission is simple, body
Many advantages, such as product small, low noise, stable transmission, more important is it also can be carried out the control of bending angle while transmission
System.A hollow rectangular tube is specifically placed on the outside of thigh and small leg mechanism to be used to be routed.By to motor just
The circulation of a cycle is completed in the control of reverse coil number.
It as shown in figure 14, is knee joint swing motion monitoring principle.Knee joint bending leads to knee skin A point
The distance between B point changes, and C point and B point are the same places of skin in figure, wherein curve AC length and curve AC ' phase
Together, and BC be distance change length.When knee joint turns to bent position in the wrong by extended position, the B point of skin surface moves to C
Point increases at a distance from A point.Articulation angle is realized indirectly by the distance between measurement skin surface fixed point A, B
The monitoring of degree.
The device of measurement distance is the silica gel module using optical fiber macrobending loss as mechanism.Optical fiber macrobending loss refers in optical fiber
When bending, light beam is unsatisfactory for total reflection condition in inside of optical fibre, is refracted to covering and the protective layer of optical fiber to cause light intensity to damage
The phenomenon that consumption.
Silica gel module both ends are separately fixed on two A-frame of knee joint, the distance when knee joint rotation, between both ends
Also change therewith, to reach the power for changing intensity loss, then reach inspection rotational angle.
Fibre optical sensor comes in the track of flexible plate, and when flexible plate is shunk and is stretched, fibre optical sensor is shunk
With stretching also along track.
Measurement knee joint: fibre optical sensor being embedded into after silica gel module and is bonded with knee joint, and knee joint is made to do front and back pendulum
When dynamic movement, the distance between the fixed point of joint two sides is converted to the flexible of silica gel module, and causes optical fiber macrobending loss, shadow
Ring the variation of light intensity.Articulation angle is determined by measuring the size of light intensity come indirect.
Claims (3)
1. a kind of Nei Zu mechanism based on rope driving for lower limb rehabilitation robot, it is characterised in that: Nei Zu mechanism packet
Hip joint, big leg mechanism, knee joint and small leg mechanism are included, the big leg mechanism includes thigh bar and the thigh for fixing thigh
Power-assisted plate, the thigh power-assisted plate are mounted on the inside of thigh bar, and the small leg mechanism includes shank bar and for fixing shank
Shank power-assisted plate, the shank power-assisted plate is mounted on the inside of shank bar, and the shank power-assisted plate and thigh power-assisted plate are
The upper end of arc, the thigh bar is connected by hip joint and the waist structure of rack, and the lower end of the thigh bar is closed by knee
Section is connect with the upper end of shank bar；
The hip joint includes upper and lower two pieces of plates, three curve connecting rods, three spherical hinges, three universal joints, four hip joints
Cotton rope and two hip joint driving motors, three universal joint equal circumference are arranged in the planar bottom surface of upside, three spherical hinges with
Arrange up and down and equal circumference is arranged on the plate top surface of downside by dislocation for three universal joints, and three universal joints pass through three songs respectively
Line connecting rod and three flexural pivot chain links, the ball that the universal joint of every curve small end connection is connect with the root curve connecting rod lower end
Hinge maps the arrangement that is centrosymmetric in the same plane；The surrounding of upper and lower two pieces of plates is respectively equipped with four line wheels, is located at
Line wheel on two pieces of plates of upper and lower the same side by a hip joint cotton rope connection, fix, another by one end of hip joint cotton rope
End and the motor shaft of hip joint driving motor synchronize, and two hip joint cotton ropes being symmetrical set share a hip joint
Driving motor, two hip joint cotton ropes that front and back is arranged symmetrically share another hip joint driving motor, two hip joint drivings
Motor is mounted on rack waist structure；Upside plate top surface is mounted on waist structure, and the bottom surface of lower flat is mounted on greatly
The upper end of leg bar；
The knee joint includes thigh runner, shank runner, two arc link blocks, two knee joint cotton ropes and knee joint driving
Motor, the thigh runner and shank runner are tangent always and be arranged between two arc link blocks, two arc link blocks
Upper and lower ends pass through a rotation axis connection respectively, the thigh runner is rotatably installed in place by thigh A-frame
In in the rotation axis of upside, the thigh A-frame is fixed on the lower end of thigh bar, and the shank runner passes through small crural triangle
Bracket is rotatably mounted in the rotation axis of downside, and shank A-frame is fixed on the upper end of shank bar, the thigh
Two spring connecting columns are respectively set in the front of A-frame and the front of shank A-frame, and two spring connecting columns are right respectively
Claim the left and right sides for being arranged in corresponding runner, the small crural triangle of each spring connecting column and the same side on thigh A-frame
Spring connecting column on bracket passes through knee joint reset spring respectively and connects；
Two line wheels are respectively set in the rear portion of the thigh A-frame and the rear portion of shank A-frame, and two line wheels are right respectively
Claim the left and right sides for being arranged in corresponding runner；At left and right sides of the lower end of thigh bar respectively symmetrically be equipped with a line wheel, every
Line wheel that one end of knee joint cotton rope is wound on shank A-frame is simultaneously fixed in the line wheel, the other end bypass be located at it is same
After line wheel on the thigh A-frame of side, further around the line wheel returned on shank A-frame, it is then passed through on thigh A-frame
Line wheel, upwardly extended close to thigh bar after the line wheel on thigh bar, two knee joint cotton ropes upwardly extend after with knee joint drive
Dynamic motor synchronous interaction, knee joint driving motor are mounted on the waist structure of rack.
2. as described in claim 1 for the Nei Zu mechanism based on rope driving of lower limb rehabilitation robot, it is characterised in that: institute
It states and is equipped with arc convex in the middle part of the edge of thigh runner, be equipped with arc groove, the arc in the middle part of the edge of the shank runner
Protrusion is engaged with arc groove.
3. as claimed in claim 1 or 2 for the Nei Zu mechanism based on rope driving of lower limb rehabilitation robot, feature exists
In: the thigh bar is rectangular shaft, and thigh power-assisted plate is equipped with the rectangular tube for being sleeved on thigh bar, and the shank bar is
Rectangular shaft, shank power-assisted plate are equipped with the rectangular tube for being sleeved on shank bar.
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| CN110302036A (en) * | 2019-07-30 | 2019-10-08 | 上海理工大学 | A kind of motion of knee joint bio-mechanism that instant center of rotation is variable |
| CN112245081A (en) * | 2020-11-12 | 2021-01-22 | 郑州大学第一附属医院 | Knee joint fixing support |
| CN112704626A (en) * | 2020-12-11 | 2021-04-27 | 天津大学 | Knee joint elastic self-locking device for lower limb rehabilitation and use method |
| WO2022027845A1 (en) * | 2020-08-05 | 2022-02-10 | 深圳市奇诺动力科技有限公司 | Angle measuring device and lower limb orthosis |
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| CN109925164B (en) | 2023-11-28 |
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