CN201260710Y - Device for measuring rotational inertia of prosthetic limb - Google Patents

Abstract

The utility model relates to an artificial limb rotation inertia measuring device which comprises a supporting seat, clamp supporting arms fixed on both sides of the supporting seat, a rotation inertia measuring system, a rotary clamp and an infrared testing device, wherein the rotary clamp is arranged between the two clamp supporting arms, a positioning rotating shaft is simultaneously screwed from both ends of the clamp supporting arms and is movably connected with the rotary clamp, the rotary clamp can rotate around the positioning rotating shaft, the infrared testing device is arranged on the left lower direction of each supporting arm, is positioned on the lowest plane of the rotary clamp in a balance state and is used for measuring the swinging period of artificial limbs and an artificial limb fixing frame, measured parameters are input into the rotation inertia measuring device to measure the rotation inertia of the artificial limbs which rotate around an arbitrary shaft, and meanwhile, a result is displayed and stored at real time. The device has convenient and accurate measurement, the accuracy satisfies a use requirement, so the device is a testing platform with double functions of measurement and research, and the same measuring principle can be popularized into rotation inertia measuring devices of other objects with complex forms.

Description

The determinator that is used for artificial limb processional moment

Technical field

This utility model relates to a kind of processional moment measuring device, particularly a kind of device that is used to measure artificial limb processional moment.

Background technology

Existing national standard about prosthetic product is primarily aimed at the crudy of artificial limb.In the artificial limb industry, the device that artificial limb processional moment is measured also is in space state at home.

The patient of each lower limb disability wishes to have the real artificial limb that is fit to oneself, and personalized production is the inexorable trend of artificial limb development from now on.Artificial leg mainly is around guaranteeing stability, improve gait and reducing the physical demands research and development, user is the incorporate dynamic process of man-machine environment in road surface walking, is to improve gait and improve the basis of artificial limb to environmental suitability to the dynamics research of this system.Human body inertia is the character of the original kinestate of human body maintenance self.The characteristic quantity of human body lower limbs inertia is meant that quality, centroid position, rotary inertia and the commentaries on classics distance etc. of human body lower limbs integral body and link play the basic variable of the gait that changes walking to human body in human body proper motion process.The rotary inertia conduct is an important artificial limb inertia characteristics amount parameter wherein, it is measured and carries out dynamic analysis in conjunction with other parameter under the biomechanics simplified model of artificial leg, significant for effectively artificial leg being made a rational functional evaluation.Therefore research and develop a kind of survey tool of artificial limb processional moment, the whole performance evaluation system of artificial limb is played a part very important, also provide reference value simultaneously for the development and the exploitation of personalized artificial limb.

Summary of the invention

This utility model is to provide a kind of measurement convenient, accurate, and precision satisfies instructions for use, to disclose the artificial limb processional moment measuring device of various artificial limb inertia characteristics.

In order to achieve the above object, the technical scheme that this utility model adopted is: a kind of artificial limb processional moment measuring device, comprise bearing, be fixed on the fixture support arm on bearing two limits, the rotary inertia test macro, be characterized in: also comprise rolling clamp, the infrared test device, rolling clamp places in the middle of two fixture support arms, positioning rotating shaft is screwed into simultaneously from fixture support arm two ends and flexibly connects with rolling clamp, rolling clamp can be rotated around positioning rotating shaft, and the support arm lower left is provided with the infrared test device, and the infrared test device is positioned on the k level that rolling clamp is in poised state, be used to measure the hunting period of artificial limb and artificial limb fixed mount, and, record the rotary inertia of artificial limb around arbitrary rotation with the parameter input rotary inertia test macro of measuring, show during simultaneously with fructufy and preservation.

The infrared test device is made up of time indicator, calculating analysis software, infrared transmitter and reflective optical system, infrared transmitter and reflective optical system detect when artificial limb rotates and carry out one-period, signal data when finally returning the equilbrium position k level, and feeding back to calculating analysis software, numeration is once; After the motion in N cycle, utilize total time and number of revolutions to draw average period.

Measurement device precision of the present utility model is 0.0001s.

The beneficial effects of the utility model are: simple in structure, easy to operate, can be convenient, measure the rotary inertia of artificial limb exactly, and precision satisfies instructions for use, is a determinator that has test concurrently, researches and develops dual-use function.Same measuring principle extends in the processional moment measuring device of other complex forms object.

Description of drawings

Fig. 1 is the rotation process sketch map after anchor clamps sandwich artificial limb;

Process sketch map when Fig. 2 is the anchor clamps zero load;

Fig. 3 is a structural front view of the present utility model;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is the vertical view of Fig. 3;

Fig. 6 is a schematic perspective view of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment this utility model is further described.

To shown in Figure 6, artificial limb processional moment measuring device of the present utility model comprises rolling clamp (rotatable clamp and clamping fixture seat) 1, fixture support arm 2, bearing 3, infrared test device 4, rotary inertia test macro as Fig. 3.

Rolling clamp 1 is positioned on the bearing 3 by support arm 2, be screwed in the time of by rotational positioning axle in both sides on the fixture support arm 25 and the fixture support arm 2 of back-outing after withstand rolling clamp 1, rolling clamp 1 can be rotated around rotating locating shaft 5, support arm 2 lower lefts are provided with infrared test device 4, it is positioned on the k level that anchor clamps are in poised state, utilize it to measure the hunting period of artificial limb and artificial limb fixed mount, and the parameter input rotary inertia test macro of measuring recorded the rotary inertia of artificial limb around arbitrary rotation, show during simultaneously with fructufy and preserve.

Infrared test device 4 is made up of time indicator, calculating analysis software, infrared transmitter and reflective optical system, infrared transmitter and reflective optical system detect when artificial limb rotates and carry out one-period, signal data when finally returning the equilbrium position k level, and feeding back to calculating analysis software, numeration is once; After the motion in N cycle, utilize total time and number of revolutions to draw average period.Measurement device precision of the present utility model is 0.0001s.

This utility model is based on rigid body round fixed axis rotational kinematics and dynamics principle, by setting up physical pendulum rotational kinematics and dynamics model, sets up relevant mathematical model, thereby determines the rotary inertia of artificial limb.

Quality is the artificial limb of m, and it is clipped in the retinue rolling clamp of an optional dress, and the support arm on whole anchor clamps both sides places above the bearing together with anchor clamps, and anchor clamps can rotate around fixed axis on bearing.Support arm of bearing the right and left and clamp guarantee that it can only rotate around fixed axis, if ignore air drag, when corner hour (as less than 5 °), can be considered as simple harmonic motion to the motion of fixed mount more accurately, obtain rotation period.At this moment, rotation period T _OWith amplitude θ ₀Irrelevant, this important approximate character is called the isochronism of pendulum.The once needed time of rolling clamp reciprocating swing is exactly its hunting period, can prove, when corner was very little, the relation between rotation period and the rotary inertia had:

$T=2\mathrm{\π}\sqrt{\frac{I}{\mathrm{mgL}}}---\left(1\right)$

Wherein: T: rotation period, I: around the rotary inertia that fixed axis rotates, L: barycenter is to the distance of rotating shaft, m: quality

If measure the cycle, so just can get rotary inertia and be according to formula:

$I=\frac{\mathrm{<figure-callout\; id="2"\; label="mg\; LT"\; filenames="Y200820153321E00091.png,Y200820153321E00092.png"\; state="\{\{state\}\}">mg</figure-callout>}{\mathrm{LT}}^{}{}^2}{{4\mathrm{\&pi;}}^2}---\left(2\right)$

After sandwiching artificial limb among Fig. 1, the distance of the centroid distance turning cylinder of artificial limb and fixed mount integral body is L, and rotation period then can be obtained the rotary inertia I of artificial limb and fixed mount integral body earlier from being measured as T by the infrared test device according to formula (2).

As shown in Figure 2, when this moment, anchor clamps rotated, because itself regular shape, centroid position was just at the geometric center C of fixed mount self ₀, the distance of fixed mount centroid distance turning cylinder is L ₀, rotation period also relies on the infrared test device to survey rotary inertia I when in like manner can obtain the device zero load again ₀, thus, just can obtain the rotary inertia of artificial limb, concrete formula is as follows:

I _C＝I-I _o (3)

$I_x=\mathrm{Ic}+{\mathrm{mL}}_x^2---\left(4\right)$

T ₀: the rotation period of fixture stand

I ₀: the rotary inertia that fixture stand is rotated around fixed axis

L ₀: the barycenter of fixture stand is to the distance of rotating shaft

m ₀: the quality of fixture stand

T: the rotation period of fixture stand and artificial limb integral body

I: the rotary inertia that fixture stand and artificial limb integral body are rotated around fixed axis

L: the barycenter of fixture stand and artificial limb integral body is to the distance of rotating shaft

M: the quality of fixture stand and artificial limb integral body

I _C: artificial limb centroid is around the rotary inertia of fixed axis

I _X: the rotary inertia that artificial limb rotates around arbitrary rotating shaft

L _X: rotating shaft to by the whole barycenter of fixture stand and artificial limb and and the axis of shaft parallel between distance.

Claims (3)

1. determinator that is used for artificial limb processional moment, comprise bearing (3), be fixed on the fixture support arm (2) on bearing two limits, the rotary inertia test macro, it is characterized in that, also comprise rolling clamp (1), infrared test device (4), described rolling clamp (1) places in the middle of two fixture support arms (2), positioning rotating shaft (5) is screwed into simultaneously from fixture support arm (2) two ends and flexibly connects with rolling clamp (1), rolling clamp (1) can be rotated around positioning rotating shaft (5), fixture support arm (2) lower left is provided with infrared test device (4), infrared test device (4) is positioned at rolling clamp (1) and is on the k level of poised state, be used to measure the hunting period of artificial limb and artificial limb fixed mount, and, record the rotary inertia of artificial limb around arbitrary rotation with the parameter input rotary inertia test macro of measuring, show during simultaneously with fructufy and preservation.

2. the determinator that is used for artificial limb processional moment according to claim 1, it is characterized in that, described infrared test device (4) is made up of time indicator, calculating analysis software, infrared transmitter and reflective optical system, infrared transmitter and reflective optical system detect when artificial limb rotates and carry out one-period, signal data when finally returning the equilbrium position k level, and feeding back to calculating analysis software, numeration is once; After the motion in N cycle, utilize total time and number of revolutions to draw average period.

3. the determinator that is used for artificial limb processional moment according to claim 1 is characterized in that, the described certainty of measurement that is used for the determinator of artificial limb processional moment is 0.0001s.

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