CN211749620U - Can more accurate activity protractor of measuring different joints - Google Patents

Abstract

The utility model discloses a movable protractor capable of measuring different joints more accurately in the technical field of joint mobility, which comprises a fixed ruler, wherein one end of the fixed ruler is provided with a fixed disc, the fixed disc is provided with an angle scale meter and a rotary measuring ruler, one end of the rotary measuring ruler is provided with a rotary disc, the other end of the rotary measuring ruler is provided with a telescopic ruler, the telescopic ruler can extend out and retract to be arranged on the rotary measuring ruler in a sliding way, the rotary measuring ruler can extend out the length which can not be reached originally by pushing and pulling the telescopic ruler, and the pointing node of the joint far away can be accurately aligned, and the fixed ruler can accurately calibrate the levelness and the verticality by a longitudinal level gauge and a transverse level gauge, thereby changing the prior purpose that the calibration levelness and the verticality depend on a simple visual measurement mode, and achieving the aim of more accurate measurement of the bone angle, so that the medical staff can observe and measure conveniently.

Description

Can more accurate activity protractor of measuring different joints

Technical Field

The utility model relates to a joint motion degree technical field especially relates to a can more accurate activity protractor who measures different joints.

Background

The joint mobility refers to the arc of motion or the angle of rotation through which the joint moves. The joint activity degree is divided into active joint activity degree and passive joint activity degree, the former is generated by active contraction of muscles, the latter is generated by external force, and free movement of muscles is avoided; the measurement of the range of motion of the joint is an essential step for evaluating patients with muscle, bone and nerve impairments, and is one of the indexes for evaluating the range and degree of the impairment of the motor function of the joint. The main purpose is as follows: determining whether the movement of the joint is limited, and finding out the reason influencing the movement of the joint; determining the degree of joint motion limitation; determining an appropriate treatment target and determining the extent of possible rehabilitation; provides objective basis for selecting proper treatment modes and methods; objectively measuring the progress of the joint movement range to evaluate the effects of rehabilitation treatment and training; provide power for patients and therapists, provide objective data for scientific research, and the like.

In order to accurately measure whether the joint mobility reaches the normal standard or not, or whether treatment is needed or not, and what degree of treatment is needed, the joint mobility cannot be judged only by a main pipe, the joint mobility angle data needs to be measured by using a protractor of the joint mobility, the number of joints of a human body is large, the sizes of the joints are different, and when measurement is needed, two fixed rulers on two sides of the protractor are aligned to the joints, so that the joint mobility protractors used at present are generally five sets and different in size, so that the joints with different sizes can be conveniently measured, the protractors with proper sizes need to be selected during measurement, for example, the joints of fingers need to use the smallest protractors, while the hip joints need to use larger protractors, but the use operation of the protractors is inconvenient at present, and the sizes of the protractors are limited during measurement, the joint pointing nodes that need to be measured cannot be aligned.

There is a need for a protractor that is accurate in orientation and capable of measuring joints of different sizes.

Based on this, the utility model designs a can more accurate activity protractor of measuring different joints to solve above-mentioned problem.

Disclosure of Invention

An object of the utility model is to provide a can more accurate activity protractor of measuring different joints, can measure the joint of different length through the rotation dipperstick that can stretch out and draw back, the effectual directional wrong problem of having avoided fixes a position fixed joint through two levels moreover, measures more accurately to can measure more joints of variation in size.

The utility model discloses a realize like this: a movable protractor capable of more accurately measuring different joints comprises a fixed ruler, wherein one end of the fixed ruler is provided with a fixed disc, the fixed disc is provided with an angle scale,

the fixed ruler is also provided with a longitudinal level and a transverse level, the longitudinal level and the transverse level are mutually perpendicular, and the longitudinal level is parallel to the central axis of the fixed ruler;

the rotary measuring scale comprises a rotary measuring scale, wherein a rotary disc is arranged at one end of the rotary measuring scale, an angle alignment line is arranged on the rotary disc, the angle alignment line can be overlapped with any scale on an angle scale, and the angle alignment line is overlapped with the axis of the rotary measuring scale passing through the circle center of the rotary disc;

the other end of the rotary measuring scale is provided with a telescopic ruler, and the telescopic ruler can extend out and retract and is arranged on the rotary measuring scale in a sliding manner;

the rotating shaft penetrates through the circle centers of the fixed disc and the rotating disc.

Further, the fixed ruler and the rotary measuring ruler are both ruler-shaped structures, the fixed disc and the rotary disc are both circular flat plate structures, the fixed ruler and the fixed disc are of an integral structure, and the rotary measuring ruler and the rotary disc are of an integral structure.

Further, length scale marks have been set up on the long edge of one side of fixed ruler, the width scope of fixed ruler and rotation measuring chi is between 1cm-3cm, the shortest length of fixed ruler and rotation measuring chi all is not less than 5cm, the axis through the axis of rotation on the fixed ruler is parallel with the long limit in fixed ruler both sides, the axis through the axis of rotation on the rotation measuring chi is parallel with the long limit in rotation measuring chi both sides.

Further, the horizontal level is arranged at one end far away from the rotating shaft, the longitudinal level is arranged on a side edge line of the fixed ruler without length scale marks, the longitudinal level is parallel to the long edge of the fixed ruler, and the horizontal level is perpendicular to the long edge of the fixed ruler.

Furthermore, the angle scale is uniformly distributed on the circumference of the whole fixed disc.

Further, the fixed protruding piece of promoting of having established of one end that is close to the rolling disc on the telescopic ruler, the fixed protruding card strip of having established of one end that the rolling disc was kept away from to the rotation dipperstick, card strip and telescopic ruler contactless, the card strip blocks on the sliding path who promotes the piece, the sliding path of telescopic ruler is same straight line with the axis that passes through the axis of rotation on the rotation dipperstick, the telescopic ruler is parallel to each other with the rotation dipperstick, the telescopic ruler is transition fit with the rotation dipperstick.

Furthermore, the pushing block is provided with anti-skid concave-convex lines, and the clamping strips are spring pieces.

Furthermore, the rotation contact surface on fixed disk and the rolling disc has all set up anti-skidding line, the cooperation is interference fit between fixed disk and the rolling disc.

The utility model has the advantages that: the utility model discloses a debugging fixed ruler, can make fixed ruler aim at one non-rotation one side joint, then rotate another joint of relative activity, and ensure that the direction node of rotation dipperstick can accurate directional calibration activity side joint, then confirm the turned angle of joint through the scale overlapping of angle alignment and angle scale gauge, thereby confirm the home range of joint, compare with normal joint mobility again, thereby obtain the activity degree and the plan treatment intensity and the scheme of joint, when measuring joint activity angle before, when joint activity angle can not reach when joint activity protractor length, all point to roughly then estimate, measurement that now can be accurate, and through push-and-pull telescopic ruler, make the rotation dipperstick can stretch out the length that originally can not reach, also can accurate alignment to the directional node of joint far away, through the longitudinal leveling instrument, the horizontal level makes calibration levelness and the straightness that hangs down that the fixed ruler can be accurate, thereby it all relies on simple range estimation mode to have changed calibration levelness and the straightness that hangs down in the past, because the calibration of level vertical is easier, the error can not be too big under the general condition, lead to people to pay close attention to, but the levelness of joint skeleton and the straightness that hangs down can direct influence measurement parameter, it is very inconvenient because measure to go to measure not to measure at ordinary times, and this device has solved this problem, can audio-visual measurement levelness or the straightness that hangs down, reach the more accurate purpose of measuring skeleton angle, make medical personnel's very convenient observation and measurement, no longer because the trouble is simply range estimation school right.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the extension structure of the extension rule of the present invention;

FIG. 3 is a side view of the structure A of the present invention;

fig. 4 is a sectional view of the present invention in the direction of a.

In the drawings, the components represented by the respective reference numerals are listed below:

1-a fixed ruler, 11-a fixed disc, 12-a length scale mark, 13-an angle scale, 2-a rotary measuring ruler, 21-a rotary disc, 22-an angle alignment line, 23-a clamping bar, 3-a longitudinal level, 31-a transverse level, 4-a telescopic ruler, 41-a pushing block and 5-a rotating shaft.

Detailed Description

Referring to fig. 1 to 4, the present invention provides a technical solution: a movable protractor capable of measuring different joints more accurately comprises a fixed ruler 1, wherein one end of the fixed ruler 1 is provided with a fixed disc 11, an angle scale 13 is arranged on the fixed disc 11,

the fixed ruler 1 is also provided with a longitudinal level 3 and a transverse level 31, the longitudinal level 3 and the transverse level 31 are arranged vertically, and the longitudinal level 3 is parallel to the central axis of the fixed ruler 1;

a rotating disc 21 is arranged at one end of the rotating measuring scale 2, an angle alignment line 22 is arranged on the rotating disc 21, the angle alignment line 22 can be overlapped with any scale on the angle scale table 13, and the angle alignment line 22 is overlapped with the axis of the rotating measuring scale 2 which passes through the center of the rotating disc 21;

the other end of the rotary measuring scale 2 is provided with a telescopic ruler 4, and the telescopic ruler 4 can be extended and retracted and is arranged on the rotary measuring scale 2 in a sliding manner;

axis of rotation 5, fixed disk 11 and 5 coincide that can rotate each other of rolling disc 21 are installed in axis of rotation 5, the centre of a circle of fixed disk 11 and rolling disc 21 is passed to axis of rotation 5, through the flexible skeleton joint that can the accurate measurement different length and size of telescopic ruler 4 to can measure whether level or vertical of fixed ruler 1 through vertical spirit level 3 and transverse level 31, improve the measuring accuracy, and no longer need a plurality of joint activity protractors of big or small diverse, only need just can deal with the joint measurement of a plurality of big or small diverse one of this device, it is more simple and convenient to use.

Wherein, the fixed ruler 1 and the rotary measuring ruler 2 are both ruler-shaped structures, the fixed disc 11 and the rotary disc 21 are both circular flat plate structures, the fixed ruler 1 and the fixed disc 11 are integral structures, the rotary measuring ruler 2 and the rotary disc 21 are integral structures, so that the relative rotation position of the rotary disc 21 of the fixed disc 11 can be adjusted by rotating the fixed ruler 1 and the rotary measuring ruler 2, thereby adjusting the angle and measuring and reading the angle, the length scale mark 12 is arranged on the long edge of one side of the fixed ruler 1, the width ranges of the fixed ruler 1 and the rotary measuring ruler 2 are between 1cm and 3cm, the shortest length of the fixed ruler 1 and the rotary measuring ruler 2 is not less than 5cm, the axis of the fixed ruler 1 passing through the rotating shaft 5 is parallel to the long edges of the two sides of the fixed ruler 1, the axis of the rotary measuring ruler 2 passing through the rotating shaft 5 is parallel to the long edges of the two sides of the rotary measuring ruler 2, the measuring requirements of the device are ensured by the requirements of width and length, the phenomenon that the length is too short and not enough is avoided, the side parallelism of the fixed ruler 1 and the rotary measuring ruler 2 is ensured, the device belongs to a standard rectangle, the transverse level 31 is arranged at one end far away from the rotary shaft 5, the longitudinal level 3 is arranged on one side edge line of the fixed ruler 1 without the length scale mark 12, the longitudinal level 3 is parallel to the long edge of the fixed ruler 1, the transverse level 31 is vertical to the long edge of the fixed ruler 1, the longitudinal level 3 and the transverse level 31 can accurately calibrate the levelness and the verticality of the fixed ruler, the angle scale 13 is uniformly distributed on the whole circumference of the fixed disc 11, the reading is complete, the reading is ensured to be accurate, the pushing block 41 is fixedly and convexly arranged at one end, close to the rotary disc 21, of the rotary measuring ruler 2, which is far away from the rotary disc 21, a clamping strip 23 is fixedly and convexly arranged at one end, the clamping strip 23 is not in contact with the telescopic ruler 4, the clamping strip 23 is blocked on a sliding path of the pushing block 41, the sliding path of the telescopic ruler 4 and the axis of the rotary measuring scale 2 passing through the rotating shaft 5 are the same straight line, the telescopic ruler 4 and the rotary measuring scale 2 are parallel to each other, the telescopic ruler 4 and the rotary measuring scale 2 are in transition fit, the telescopic ruler 4 of the device slides smoothly, the direction is accurate, deviation is avoided, pushing and pulling are convenient, the telescopic ruler 4 is ensured not to fall off and is clamped by the clamping strip 23 in pointing, shaking is avoided, the pushing block 41 is provided with anti-skid concave-convex grains, the clamping strip 23 is a spring piece, the pushing block 41 is conveniently pushed to push the telescopic ruler 4, the clamping strip 23 is also convenient to clamp the telescopic ruler 4, the fixed disc 11 and the rotary contact surface on the rotary disc 21 are provided with anti-skid, the fixed disc 11 and the rotary disc 21 are in interference fit, the fixed disc 11 and the rotating disc 21 can be ensured to rotate relatively and can not slide randomly, and the reading is kept accurate after the fixed disc and the rotating disc leave the bone.

One specific application of the embodiment is as follows: the utility model discloses through hugging closely fixed ruler 1 on the joint when using, and confirm that the chi body of fixed ruler 1 is near the joint pointing bone, and not rely on fixed ruler 1 roughly to the direction of the joint pointing bone, and not through the roughly direction of range finding fixed ruler 1, fixed ruler 1 all belongs to calibration standard ruler under the general condition, it is not rotatory, through vertical 3 surveyors and horizontal surveyors 31 on fixed ruler 1, ensure to need fixed ruler 1 to be in level or perpendicular to the ground direction, because, vertical 3 surveyors and horizontal surveyors 31 can audio-visual and accurate definite, whether fixed ruler 1 is horizontal or perpendicular, and need not judge through the range finding, then rotate the joint that needs the measurement, then rotatory rotation 2 simultaneously, ensure that the outer end of rotation dipperstick 2 directly contacts with pointing bone, and whether through the extension line of rotation dipperstick 2 aims at the bony character sign, if the original rotary measuring scale 2 is not long enough, the telescopic ruler 4 can slide out of the rotary measuring scale 2, which is equivalent to extending the length of the rotary measuring scale 2, and the rotary measuring scale 2 is parallel to the telescopic ruler 4, and the telescopic ruler 4 slides along the axis of the rotary measuring scale 2, so that the telescopic ruler 4 is the extension line of the rotary measuring scale 2, and the sliding does not deviate, and the rotary measuring scale 2 and the telescopic ruler 4 are in transition fit, so that the telescopic ruler 4 is ensured not to be loosened, and the drawn length is kept to be blocked by the clamping strip 23, the clamping strip 23 is a spring strip, the bending direction of the clamping strip 23 is the principle or the telescopic ruler 4 is pressed, the sliding of the telescopic ruler 4 is further limited, the elasticity of the clamping strip 23 is not too large, the telescopic ruler 4 is slightly pressed, and the telescopic ruler 4 cannot freely slide, the pushing block 41 on the telescopic ruler 4 and the clamping strip 23 block each other, so that the telescopic ruler 4 is further limited not to slide off the rotary measuring scale 2, and the top of the pushing block 41 is provided with anti-slip lines, so that an operator can easily push and pull the pushing block 41 to drive the telescopic ruler 4, and when force is not applied to the pushing block 41, the telescopic ruler 4 is clamped by the rotary measuring scale 2 and the clamping strip 23 and cannot be loosened;

the extension length and the pointing direction of the telescopic ruler 4 are well adjusted, the telescopic ruler 4 is ensured to contact and align with the pointing node of the rotary joint skeleton, when the rotary measuring scale 2 rotates along the skeleton, the fixed ruler 1 keeps immovable along with the fixed skeleton on the other side, so the fixed disc 11 keeps immovable along with the fixed ruler 1, the rotary disc 21 rotates along with the rotary measuring scale 2, so the fixed disc 11 and the rotary disc 21 relatively rotate along the axis of the rotary shaft 5, the angle alignment line 22 on the rotary disc 21 also rotates along with the fixed ruler, the angle alignment line 22 is on the axis of the rotary measuring scale 2, so when the rotary measuring scale 2 rotates along with the skeleton, the angle measurement is completed, the rotary disc 21 and the fixed disc 11 are clamped with each other, the rotary shaft 5 is a common screw hole at one end and a bolt at the other end locks the rotary disc 21 and the fixed disc 11, just so can adjust the elasticity degree of rolling disc 21 and fixed disk 11, can ensure not receive when external force, rolling disc 21 can not rotate easily with fixed disk 11, angle alignment 22 can be fixed on the rotation reading of angle scale table 13, can take off this device from the patient's health next, observe which angle on the angle scale table 13 that angle alignment 22 aimed at, just so can be accurate measure the joint activity angle of disease, be convenient for subsequent treatment, and can measure skeleton length through length scale mark 12 on the fixed ruler 1, judge whether the same skeleton length in both sides is the same, whether the measurement that can be accurate is not isometric of low limbs, the structural problem of bones such as upper limbs isometric.

Measuring the neck articulation in the rotation direction

During the use, the operator orders the surveyor to put posture and position according to clinical joint mobility measuring's requirement, puts the fixed ruler 1 of this joint mobility protractor on shoulder and be on a parallel with ground, confirms whether fixed ruler 1 is horizontal through vertical spirit level 3, after the rotation dipperstick 2 points to the back eminence of pillow, if rotation dipperstick 2 length is not enough, then pull out telescopic ruler 4 on the rotation dipperstick 2 until the telescopic ruler 4 distal end touches the back eminence of pillow, the vertical spirit level 3 and the horizontal spirit level 31 on the fixed ruler 1 of visualing, confirm that fixed ruler 1 is measured when being in the horizontal position and accomplish, angle reading on the angle gauge 13 is the degree of neck joint lateral bending activity to angle alignment 22 on the rolling disc 21.

Example for measuring shoulder joint mobility, rotation direction: posterior extension of shoulder joint

During the use, the operator orders the surveyed person to put posture and position according to clinical joint activity degree measuring's requirement, is parallel with the fixed chi 1 of this joint activity protractor and trunk (axillary midline), and the rotation measurement chi 2 is parallel with the upper arm bone longitudinal axis and measures, and the reading that reads angle alignment 22 and aim at on the angle scale 13 is the degree of shoulder joint back extension activity promptly.

In addition, the bony landmarks refer to bones in certain parts of the human body, which often form obvious ridges or depressions on the body surface of the human body, and are often used clinically as positioning markers.

The device can measure a plurality of bones with different sizes and lengths, has wider applicable bone range, is suitable for measuring different bones, can extend and retract the telescopic rod 4, is suitable for aligning and measuring joint bones with different lengths, can obtain the requirements of levelness and verticality when the longitudinal level 3 and the transverse level 31 of the device are used in different directions, can ensure that the fixed ruler 1 meets the requirements of whether the fixed ruler is vertically fixed with the ground or horizontally, can judge whether the fixed ruler 1 is horizontal through the longitudinal level 3 when the fixed ruler 1 is horizontally placed, and can ensure that the fixed ruler 1 is vertical to the ground as long as the transverse level 31 is horizontal when the fixed ruler 1 is vertical, so the fixed ruler 1 is vertical to the ground, the measurement is more convenient, in recent years, the aging trend is increasingly aggravated, the population of chronic diseases and sub-health crowds are continuously increased, and the requirements of people on rehabilitation are increasingly larger, the joint protractors are frequently and frequently used for evaluating the joint functions, researchers at home and abroad design rehabilitation function evaluation protractors with different specifications according to actual requirements, the rehabilitation function evaluation protractors are used for evaluating the mobility of each bone joint and the motion function level of a patient, and can also be used for teaching, but still have the problems that: because a set of equipment is divided into different specifications and sizes, has a large number of devices, and is required to be stored in a suitcase, so that the equipment is very inconvenient to carry, protractors with different specifications are integrated into a whole by the device, the purpose of one object is achieved, the problem of insufficient accuracy in clinical measurement is solved, the influence caused by visual inspection errors of a measurer is reduced, and the condition of inaccurate measured data is reduced, the observation scale of the device is direct and clear, errors are not easy to occur, the fixed ruler 1 and the rotary measuring ruler 2 can be pushed to rotate by force, and can be clamped mutually when the force is not applied, the reading is prevented from sliding, the possibility of errors is reduced, and the telescopic ruler 4 can be directly aligned to a pointed bone to be measured without visual inspection;

measuring elbow joint activity degree, the fixed ruler 1 is parallel with the humerus axis of ordinates, directional ulna olecranon, the rotary measuring ruler 2 is parallel with the radius axis of ordinates, directional radius styloid process, need aim at rotary measuring ruler 2 the bony character sign on the wrist joint inboard on the anatomical position of wrist joint: the radius styloid process, but the original measuring tool is not so long, can't touch the bony sign accurately, can only roughly align through the visual inspection, use this apparatus can paste the extension rule 4 on the radius styloid process on the elbow joint directly at present, has avoided the direction error of the visual inspection completely like this, this apparatus has improved the measurement accuracy like this, measure more simple and convenient, do not need to look for the different protractors of the corresponding skeleton, but the skeleton measurement of most different length and size that this apparatus can solve, the skeleton size of adult and children differs greatly in length, this apparatus can also be suitable for the measurement of adult and child, do not need to change the measuring tool frequently.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims (8)

1. The utility model provides a can more accurate activity protractor of measuring different joints which characterized in that: comprises that

A fixed ruler (1), a fixed disc (11) is arranged at one end of the fixed ruler (1), an angle scale (13) is arranged on the fixed disc (11),

the fixed ruler (1) is further provided with a longitudinal level (3) and a transverse level (31), the longitudinal level (3) and the transverse level (31) are perpendicular to each other, and the longitudinal level (3) is parallel to the central axis of the fixed ruler (1);

the measuring device comprises a rotary measuring scale (2), wherein a rotary disc (21) is arranged at one end of the rotary measuring scale (2), an angle alignment line (22) is arranged on the rotary disc (21), the angle alignment line (22) can be overlapped with any scale on an angle dial gauge (13), and the angle alignment line (22) is overlapped with the axis of the rotary measuring scale (2) which penetrates through the circle center of the rotary disc (21);

the other end of the rotary measuring scale (2) is provided with a telescopic ruler (4), and the telescopic ruler (4) can extend out and retract and is slidably arranged on the rotary measuring scale (2);

the rotating shaft (5), the fixed disk (11) and the rotating disk (21) can be mutually rotated and are arranged on the rotating shaft (5) in an overlapped mode, and the rotating shaft (5) penetrates through the circle centers of the fixed disk (11) and the rotating disk (21).

2. A motion protractor capable of more accurately measuring different joints according to claim 1, wherein: fixed ruler (1) and rotation dipperstick (2) all are ruler column structure, fixed disk (11) and rolling disc (21) all are circular flat structure, fixed ruler (1) are overall structure with fixed disk (11), rotation dipperstick (2) are overall structure with rolling disc (21).

3. A motion protractor capable of more accurately measuring different joints according to claim 2, wherein: length scale mark (12) have been set up on the long edge of one side of fixed ruler (1), the width scope of fixed ruler (1) and rotation measurement chi (2) is between 1cm-3cm, the shortest length of fixed ruler (1) and rotation measurement chi (2) all is not less than 5cm, the axis through axis of rotation (5) is parallel with the long limit in fixed ruler (1) both sides on fixed ruler (1), the axis through axis of rotation (5) is parallel with the long limit in rotation measurement chi (2) both sides on rotation measurement chi (2).

4. A motion protractor capable of more accurately measuring different joints according to claim 3, wherein: horizontal surveyor's level (31) set up the one end of keeping away from axis of rotation (5), install on a side line that fixed ruler (1) does not have length scale mark (12) longitudinal surveyor's level (3), longitudinal surveyor's level (3) are parallel with the long limit of fixed ruler (1), horizontal surveyor's level (31) are perpendicular with the long limit of fixed ruler (1).

5. A motion protractor capable of more accurately measuring different joints according to claim 2, wherein: the angle dial gauges (13) are uniformly distributed on the circumference of the whole fixed disc (11).

6. A motion protractor capable of more accurately measuring different joints according to claim 2, wherein: the fixed protruding promotion piece (41) of having established of one end that is close to rolling disc (21) on telescopic ruler (4), the fixed protruding card strip (23) of having established of one end that rolling disc (21) were kept away from in rotation dipperstick (2), card strip (23) and telescopic ruler (4) contactless, card strip (23) block on the sliding path who promotes piece (41), the sliding path of telescopic ruler (4) is same straight line with the axis that passes through axis of rotation (5) on rotation dipperstick (2), telescopic ruler (4) are parallel to each other with rotation dipperstick (2), telescopic ruler (4) are transition fit with rotation dipperstick (2).

7. A motion protractor capable of more accurately measuring different joints according to claim 6, wherein: the pushing block (41) is provided with anti-skid concave-convex lines, and the clamping strips (23) are spring pieces.

8. A motion protractor capable of more accurately measuring different joints according to claim 1, wherein: the anti-skidding line is arranged on the rotating contact surface of the fixed disc (11) and the rotating disc (21), and the fixed disc (11) and the rotating disc (21) are in interference fit.

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