CN113137903A - Angle gauge and angle calculation method - Google Patents
Angle gauge and angle calculation method Download PDFInfo
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- CN113137903A CN113137903A CN202010060391.1A CN202010060391A CN113137903A CN 113137903 A CN113137903 A CN 113137903A CN 202010060391 A CN202010060391 A CN 202010060391A CN 113137903 A CN113137903 A CN 113137903A
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- measuring arm
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- increasing device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses an angle ruler and an angle calculation method, wherein the angle ruler comprises a first measuring arm and a second measuring arm, the first measuring arm and the second measuring arm are pivoted, and the angle ruler also comprises: the speed increasing device is connected with the first measuring arm and arranged at the pivoting position of the first measuring arm and the second measuring arm, and can increase the rotation speed of the first measuring arm and output the rotation speed; the first angle detection unit can detect the rotation angle of the first measuring arm relative to the second measuring arm and output a first signal; the second angle detection unit can detect the rotating angle of the output end of the speed increasing device relative to the first measuring arm and output a second signal; and the data processing unit is configured to process the first signal and the second signal and output a final result of the angle measured by the angle ruler. The angle ruler is provided with the speed increasing device on the first measuring arm, and the final angle value is determined by measuring the rotation angle value of the speed increasing device and the rotation angle value of the first measuring arm, so that the accurate measurement of the angle can be realized.
Description
Technical Field
The invention relates to the technical field of angle measurement, in particular to an angle ruler and an angle calculation method.
Background
The angle ruler is used for measuring an angle, two measuring arms are arranged on the angle ruler, namely a fixed arm and a rotating arm respectively, the fixed arm is attached to one edge of an angle to be measured, then the rotating arm is rotated to enable the rotating arm to be attached to the other edge of the angle to be measured, the rotating angle of the rotating arm is detected through a sensor on the angle ruler, and the angle value of the angle to be measured can be measured. The existing angle ruler only detects the rotation angle of the rotating arm through a group of sensors, measures the angle value, and has inaccurate measuring result and low measuring precision.
Therefore, it is necessary to provide an angle ruler with accurate measurement result and high measurement precision.
Disclosure of Invention
The invention aims to provide an angle ruler and an angle calculation method, and aims to solve the problems that in the prior art, the side measurement result of the angle ruler is inaccurate and the measurement precision is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a bevel protractor, includes first measuring arm and second measuring arm, and first measuring arm and second measuring arm pin joint still include:
the speed increasing device is connected with the first measuring arm and arranged at the pivoting position of the first measuring arm and the second measuring arm, and can increase the rotation speed of the first measuring arm and output the rotation speed;
the first angle detection unit can detect the rotation angle of the first measuring arm relative to the second measuring arm and output a first signal;
the second angle detection unit can detect the rotating angle of the output end of the speed increasing device relative to the first measuring arm and output a second signal;
and the data processing unit is electrically connected with the first angle detection unit and the second angle detection unit, can process the first signal and the second signal, and outputs and displays the final result of the angle measured by the angle ruler.
In an alternative embodiment of the invention, the speed increasing device is a gear speed increasing device.
In an alternative embodiment of the invention, the speed increasing device is a planetary gear speed increasing device.
In an alternative embodiment of the present invention, a speed increasing device includes:
the rotating disc is connected with the first measuring arm and can rotate along with the first measuring arm, and an inner gear ring is arranged on the rotating disc;
the planet gear is meshed with the inner gear ring and is connected to the turntable through a pin shaft;
and the sun wheel is meshed with the planet wheel and is the output end of the speed increasing device.
In an optional embodiment of the present invention, the angle ruler further comprises an upper shell and a lower shell pivotally connected to the upper shell;
the first measuring arm is arranged on the lower shell, and the second measuring arm is arranged on the upper shell so as to enable the first measuring arm and the second measuring arm to be pivoted.
In an alternative embodiment of the present invention, a first mounting rib is provided on the lower case, the first mounting rib extending from the lower case to the upper case;
the first angle detection unit includes:
the first magnetic block is arranged at the top of the upper shell;
and the first angle sensing chip is arranged on the first mounting rib and is opposite to the first magnetic block.
In an alternative embodiment of the present invention, the second angle detecting unit includes:
the second magnetic block is arranged at the bottom of the lower shell;
and the second angle sensing chip is arranged at the bottom end of the sun wheel and is opposite to the second magnetic block.
In an alternative embodiment of the present invention, the lower case is provided with a second mounting rib extending from the lower case toward the bottom of the turntable, and the turntable is coupled to the second mounting rib.
In an alternative embodiment of the present invention, a third mounting rib is provided on the upper case, the third mounting rib extends from the upper case to a top end of the sun gear, and the top end of the sun gear is pivotally connected to the third mounting rib.
An angle calculation method for a goniometer, the goniometer comprising: the measuring device comprises a first measuring arm and a second measuring arm, wherein the first measuring arm is pivoted with the second measuring arm;
the speed increasing device is connected with the first measuring arm and arranged at the pivoting position of the first measuring arm and the second measuring arm, and can increase the rotation speed of the first measuring arm and output the rotation speed;
the first angle detection unit can detect the rotation angle of the first measuring arm relative to the second measuring arm;
the second angle detection unit can detect the rotating angle of the output end of the speed increasing device relative to the first measuring arm;
the speed increasing device includes:
the rotating disc is connected with the first measuring arm and can rotate along with the first measuring arm, and an inner gear ring is arranged on the rotating disc;
the planet gear is meshed with the inner gear ring and is connected to the turntable through a pin shaft;
the sun wheel is meshed with the planet wheel and is the output end of the speed increasing device;
the transmission ratio of the turntable to the sun gear is N1: N2;
the angle detected by the first angle detection unit is A1; the angle detected by the second angle detection unit is A2;
the angle calculation method comprises the following steps:
measuring a scale R as a minimum range which averagely divides 360 degrees into (N2/N1);
m ═ a1/R ═ R, M is the median value calculated for a1, M is the number of integer multiples of R;
a0 ═ M + a2 × (N1/N2) + a ', a0 is the intermediate angle value, a ' is the correction value, which was corrected to the angle bar 100 before the start of the measurement so that a ' is 0;
δ＝A1-[A1/R]*R，
when δ is equal to or less than R/2 and a2 is equal to or greater than 180 °, the precise angle measurement a is a 0-R;
when δ is greater than R/2 and a2 is less than 180 °, the precise angle measurement a — a0+ R;
when (δ -R/2) × (a2-180 °) is greater than 0, the precise angle measurement a is a 0.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the speed increasing device is arranged on the first measuring arm, the speed increasing device outputs the rotation speed increase of the first measuring arm and measures the rotation angle after the speed increase, so that the accurate measurement of the angle is realized, the rough measurement of the angle is carried out by combining the direct measurement of the rotation of the first measuring arm, and finally the final angle value of the angle measured by the angle ruler is calculated through an algorithm according to the measurement results of the rough measurement and the accurate measurement, so that the angle measurement result is more accurate.
Drawings
FIG. 1 is a schematic view of the angle ruler of the present invention in a closed position;
FIG. 2 is a schematic view of the angle ruler of the present invention in an open position;
FIG. 3 is an exploded view of the upper and lower casings and the speed increasing device of the present invention;
FIG. 4 is a schematic view of the structure of the speed increasing device of the present invention;
fig. 5 is a schematic sectional view of the speed increasing device of the present invention.
In the figure:
100-angle ruler; 10-a first measuring arm; 20-a second measuring arm; 30-upper shell; 40-a lower shell; 50-a speed increasing device; 60-a first angle detection unit; 70-a second angle detection unit; 80-a display screen;
31-a third mounting rib; 41-a first mounting rib; 42-a second mounting rib; 51-a turntable; 52-planet wheel; 53-sun gear; 54-a pin shaft; 61-a first magnetic block; 62-a first angle sensing chip; 71-a second magnetic block; 72-a second angle sensing chip; 511-column-shaped connecting part.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The invention provides an angle ruler, as shown in fig. 1 and fig. 2, an angle ruler 100 comprises a first measuring arm 10 and a second measuring arm 20, wherein the first measuring arm 10 is pivoted with the second measuring arm 20, so that the first measuring arm 10 can rotate, and the angle ruler 100 is opened for angle measurement. The first measuring arm 10 and the second measuring arm 20 may be a rotating arm and a fixed arm, respectively, of the angle ruler 100. The first measuring arm 10 and the second measuring arm 20 may be directly pivoted or may be pivoted by other pivoting members, which is not limited herein. In some embodiments, the angle ruler 100 further comprises an upper case 30 and a lower case 40, and the first measuring arm 10 and the second measuring arm 20 are pivotally connected through the upper case 30 and the lower case 40. Specifically, the lower shell 40 is pivoted with the upper shell 30 to form a pivoting member, the first measuring arm 10 is disposed on the lower shell 40, and the second measuring arm 20 is disposed on the upper shell 30, so that the first measuring arm 10 is pivoted with the second measuring arm 20. During measurement, the second measuring arm 20 is tightly attached to one side of the angle to be measured, the first measuring arm 10 is pulled to the other side of the angle to be measured, and the first measuring arm 10 drives the lower shell 40 to rotate around the pivot point, so that the angle measurement is completed.
As shown in fig. 3 and 4, the angle ruler 100 further includes a speed increasing device 50, a first angle detecting unit 60, a second angle detecting unit 70, and a data processing unit. Speed increasing device 50 sets up in first measuring arm 10 and the pin joint department of second measuring arm 20, just so can make first measuring arm 10 drive speed increasing device 50 when rotating, and speed increasing device 50 can be with the rotation acceleration rate output of first measuring arm 10, through measuring the rotation angle of the output of speed increasing device 50 acceleration rate and the angle value that first angle detecting element 60 detected, realizes the accurate measurement of angle. In some embodiments, the speed increasing device 50 is disposed on the lower casing 40 to indirectly connect the speed increasing device 50 to the first measuring arm 10, so that when the first measuring arm 10 rotates, the lower casing 40 rotates, and the speed increasing device 50 is driven by the lower casing 40 to rotate.
Specifically, the first angle detecting unit 60 can detect the rotation angle of the first measuring arm 10 with respect to the second measuring arm 20 and output a first signal, and the second angle detecting unit 70 can detect the rotation angle of the output end of the speed increasing device 50 with respect to the first measuring arm 10 and output a second signal. The first angle detection unit 60 and the second angle detection unit 70 send the detection results to the data processing unit, the data processing unit is electrically connected with the first angle detection unit 60 and the second angle detection unit 70, and the data processing unit is configured to process a first signal output by the first angle detection unit 60 and a second signal output by the second angle detection unit 70, calculate a final measurement result of the angle measured by the angle ruler through an algorithm, and display the final measurement result so that a user can visually see the measured angle value. In some embodiments, the first signal can reflect the angle of rotation of the first measuring arm 10 relative to the second measuring arm 20, and the second signal can reflect the angle of rotation of the output end of the speed increasing device 50 relative to the first measuring arm 10.
It will be appreciated that the data processing unit comprises a processor (e.g. a single chip microcomputer) and a display 80, and in one embodiment, the data processing unit is disposed on the second measuring arm 20, as shown in fig. 2, and the display 80 of the data processing unit is disposed on the upper surface of the second measuring arm 20, so as to facilitate the user to view the detection result. In other embodiments, the data processing unit may also be disposed on the first measuring arm 10, which is not limited herein. The display screen 80 is preferably an LED display screen.
The invention is provided with two groups of angle detection units, one group is used for detecting the rotation angle of the first measuring arm 10 to realize rough measurement of the angle, the other group is used for detecting the rotation angle of the output end of the speed increasing device 50 relative to the first measuring arm 10 to realize precise measurement of the angle, and finally, the detection results of the two groups of angle detection units are integrated through an algorithm to output the final detection result, so that the angle measurement is more accurate.
In one embodiment, the speed increasing device 50 is a gear speed increasing device. Specifically, the speed increasing device 50 is a planetary gear speed increasing device. Of course, the speed increasing device 50 may be other speed increasing devices, and is not limited herein.
As shown in fig. 4 and 5, the speed increasing device 50 includes a turntable 51, a planetary gear 52, and a sun gear 53. The turntable 51 is connected to the first measuring arm 10 and can rotate along with the first measuring arm 10. During specific implementation, the turntable 51 is connected to the lower shell 40, and is indirectly connected to the first measuring arm 10, and the first measuring arm 10 rotates to drive the lower shell 40 to rotate, so that the lower shell 40 drives the turntable 51 to rotate. As shown in fig. 5, an inner gear ring is disposed on the turntable 51, a plurality of planet gears 52 are engaged with the inner gear ring on the turntable 51, and meanwhile, the planet gears 52 are connected to the turntable 51 through pins 54, and the planet gears 52 rotate along with the turntable 51. Sun gear 53 meshes with planet wheel 52, and sun gear 53 meshes in the middle of a plurality of planet wheel 52, drives sun gear 53 through planet wheel 52 and rotates, and it can be understood that sun gear 53 diameter is less, and the rotational speed increases after the torque is transmitted to sun gear 53, realizes the acceleration rate, that is to say, sun gear 53 is the output of speed increasing device 50.
In some embodiments, a first mounting rib 41 is provided on the lower case 40, and the first mounting rib 41 extends from the lower case 40 toward the upper case 30. The first angle detecting unit 60 includes a first magnetic block 61 and a first angle sensing chip 62, the first magnetic block 61 is disposed on the top of the upper case 30, the first angle sensing chip 62 is disposed on the first mounting rib 41, and the first angle sensing chip 62 is disposed opposite to the first magnetic block 61 so that the first angle sensing chip 62 detects an angle of relative rotation between the first angle sensing chip and the first magnetic block 61. When the lower shell 40 is driven by the first measuring arm 10 to rotate, the first mounting rib 41 on the lower shell 40 drives the first angle sensing chip 62 to rotate, the first magnetic block 61 is mounted on the upper shell 30 and fixed, and the second measuring arm 20 is also arranged on the upper shell 30, so that the first angle sensing chip 62 can detect the rotation angle of the first measuring arm 10 relative to the second measuring arm 20.
Specifically, the second angle detecting unit 70 includes a second magnetic block 71 and a second angle sensing chip 72, the second magnetic block 71 is disposed at the bottom of the lower casing 40, the second angle sensing chip 72 is disposed at the bottom end of the sun gear 53, and the second angle sensing chip 72 is disposed opposite to the second magnetic block 71, so that the second angle sensing chip 72 detects the angle of relative rotation between the second angle sensing chip and the second magnetic block 71, that is, the rotation angle of the sun gear 53. The second magnetic block 71 is arranged at the bottom of the lower casing 40, the lower casing 40 is connected with the first measuring arm 10 and can rotate along with the first measuring arm 10, then the second magnetic block 71 can also rotate along with the first measuring arm 10, the second angle sensing chip 72 is arranged at the bottom end of the sun gear 53 and can rotate along with the sun gear 53, and therefore the second angle sensing chip 72 can detect the rotation angle of the sun gear 53 relative to the first measuring arm 10.
During detection, when the torque of the first measuring arm 10 is transmitted to the sun gear 53 through the turntable 51 and the planet gear 52, the rotation direction is opposite, that is, the rotation direction of the sun gear 53 is opposite to the rotation direction of the first measuring arm 10.
In some embodiments, a second mounting rib 42 is provided on the lower shell 40, the second mounting rib 42 extends from the lower shell 40 to the bottom of the rotary disc 51, the rotary disc 51 is connected to the second mounting rib 42, and the second mounting rib 42 is provided on the lower shell 40, so that the rotary disc 51 is connected to the lower shell 40 through the second mounting rib 42, the first measuring arm 10 is provided on the lower shell 40, when the first measuring arm 10 rotates, the torque is transmitted to the rotary disc 51 through the lower shell 40 and the second mounting rib 42, the rotary disc 51 is driven to rotate, and the planetary gear 52 and the sun gear 53 are further driven, so as to realize speed increase.
Specifically, as shown in fig. 5, a column-shaped connecting portion 511 for connecting with the second mounting rib 42 is disposed at the bottom of the rotary disc 51, and a through hole for the sun gear 53 to pass through is disposed in the middle of the column-shaped connecting portion 511, so that the sun gear 53 passes through the rotary disc 51 from the through hole and passes below the rotary disc 51, and the second angle sensing chip 72 at the bottom end of the sun gear 53 can be opposite to the second magnetic block 71 to detect the rotation angle of the sun gear 53.
In one embodiment, the third mounting rib 31 is provided on the upper case 30 to support the sun gear 53, the third mounting rib 31 extends from the upper case 30 to the tip end of the sun gear 53, the tip end of the sun gear 53 is pivotally connected to the third mounting rib 31 so that the sun gear 53 rotates on the third mounting rib 31, and the third mounting rib 31 supports the sun gear 53, thereby improving the stability of the speed increasing device 50.
In one embodiment, the first angle sensing chip 62 and the second angle sensing chip 72 are hall sensors. As shown in fig. 4 and 5, the first angle sensing chip 62 and the second angle sensing chip 72 are mounted on the PCB circuit board.
The present invention also discloses an angle calculating method for an angle ruler, the angle ruler 100 includes: the measuring device comprises a first measuring arm 10 and a second measuring arm 20, wherein the first measuring arm 10 is pivoted with the second measuring arm 20;
the measuring device further comprises a speed increasing device 50, wherein the speed increasing device 50 is connected with the first measuring arm 10 and arranged at the pivot joint of the first measuring arm 10 and the second measuring arm 20, and the speed increasing device 50 can increase the rotating speed of the first measuring arm 10 and output the rotating speed;
the device further comprises a first angle detection unit 60, wherein the first angle detection unit 60 can detect the rotation angle of the first measuring arm 10 relative to the second measuring arm 20;
the second angle detection unit 70 is further included, and the second angle detection unit 70 can detect the rotation angle of the output end of the speed increasing device 50 relative to the first measuring arm 10;
the speed increasing device 50 includes:
the turntable 51 is connected with the first measuring arm 10 and can rotate along with the first measuring arm 10, and an inner gear ring is arranged on the turntable 51;
planet gears 52, the planet gears 52 are meshed with the inner gear ring and are connected to the turntable 51 through pin shafts 54;
the sun gear 53, the sun gear 53 is meshed with the planet gear 52, the sun gear 53 is the output end of the speed increasing device 50, that is, the second angle detecting unit 70 detects the angle of rotation of the sun gear 53 relative to the first measuring arm 10.
The planetary reduction structure composed of the ring gear, the planet gears 52 and the sun gear 53 is already the prior art, and is not described herein again.
When the angle gauge 100 detects an angle, an algorithm for detection is as follows:
let the transmission ratio of the turntable 51 to the sun gear 53 be N1: n2, N1 indicates the rotation speed of the turntable 51, and N2 indicates the rotation speed of the driven sun gear 53. N1-N2 can also be multi-stage transmission, and only the final transmission ratio is considered in calculation;
let a master ruler measurement data (i.e., data measured by the first angle detection unit 60) be a 1;
let the sub-scale measurement data (i.e., the data measured by the second angle detection unit 70) be a 2;
setting a measuring scale as R; the measuring scale R is the minimum measuring scale which evenly divides 360 degrees into (N2/N1), and then R is 360 degrees (N1/N2);
assuming that M is the median value calculated by a1, and M is the value of an integer multiple of R, i.e., [ a1/R ] × R, "[ ]" represents rounding, e.g., [ X ] is an operation of taking the integer value of X, example 1: [3.6] ═ 3, case 2: 2.1 ═ 2;
let the measurement result be a0, a0 ═ M + a2 ═ N1/N2) + a',
a 'is a correction value, which is corrected to the angle bar 100 before the measurement starts, so that a' is 0;
because of the measurement error, a correction algorithm must be added, specifically:
δ＝A1-[A1/R]*R，
1) when delta is equal to or less than R/2 and a2 is equal to or greater than 180 deg., the end result a-a 0-R,
2) when δ is greater than R/2 and a2 is less than 180 °, the end result a is a0+ R,
3) when (δ -R/2) × (a2-180 °) is greater than 0, the final result a ═ a 0;
a is the final displayed measurement of the angle measured by the angle gauge 100, and is a more accurate angle measurement.
In particular embodiments, other gear ratios and other modes of transmission may be used to transmit rotation. The transmission is preferably a gear, and other stable transmission modes can be selected.
The specific application example of the algorithm described above:
the first embodiment is as follows:
A1＝35°，A2＝358°；
N2/N1＝10，R＝360°*(N1/N2)＝36°，M＝[35°/36°]*36°＝0；
A0＝0+358*(1/10)＝35.8°，δ＝35°-(35°/36°)*36°＝35°；
since (δ -R/2) × (a2-180) is greater than 0, a0 is 35.8 °.
Example two:
A1＝35°，A2＝358°；
N2/N1＝20，R＝360°*(N1/N2)＝18°，M＝[35°/18°]*18°＝18；
A0＝18+358*(1/20)＝35.9°，δ＝35°-[35°/18°]*18°＝17°；
since (δ -R/2) × (a2-180) is greater than 0, a0 is 35.9 °.
Thus, the first angle detecting unit 60 and the second angle detecting unit 70 are matched with each other, and the angle can be accurately measured by combining a measuring algorithm of the angle ruler.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a bevel protractor, includes first measuring arm and second measuring arm, first measuring arm with the pin joint of second measuring arm, its characterized in that still includes:
the speed increasing device is connected with the first measuring arm and arranged at the pivoting position of the first measuring arm and the second measuring arm, and can increase the rotation speed of the first measuring arm and output the rotation speed;
the first angle detection unit can detect the rotation angle of the first measuring arm relative to the second measuring arm and output a first signal;
the second angle detection unit can detect the rotation angle of the output end of the speed increasing device relative to the first measuring arm and output a second signal;
and the data processing unit is electrically connected with the first angle detection unit and the second angle detection unit and is configured to process the first signal and the second signal, output a final result of the angle measured by the angle ruler and display the final result.
2. The angle rule of claim 1, wherein the speed increasing device is a gear speed increasing device.
3. A bevel rule according to claim 2, wherein the speed increasing means is a planetary gear speed increasing means.
4. The angle ruler of claim 3, wherein the speed increasing device comprises:
the rotating disc is connected with the first measuring arm and can rotate along with the first measuring arm, and an inner gear ring is arranged on the rotating disc;
the planet gear is meshed with the inner gear ring and is connected to the turntable through a pin shaft;
and the sun wheel is meshed with the planet wheel, and the sun wheel is the output end of the speed increasing device.
5. The angle rule of claim 4, wherein the angle rule further comprises an upper housing and a lower housing pivotally connected to the upper housing;
the first measuring arm is arranged on the lower shell, and the second measuring arm is arranged on the upper shell, so that the first measuring arm and the second measuring arm are pivoted.
6. The angle rule of claim 5, wherein the lower housing is provided with a first mounting rib thereon, the first mounting rib extending from the lower housing to the upper housing;
the first angle detection unit includes:
the first magnetic block is arranged at the top of the upper shell;
and the first angle sensing chip is arranged on the first mounting rib and is opposite to the first magnetic block.
7. The angle ruler of claim 6, wherein the second angle detection unit comprises:
the second magnetic block is arranged at the bottom of the lower shell;
and the second angle sensing chip is arranged at the bottom end of the sun wheel and is opposite to the second magnetic block.
8. The angle ruler of claim 5, wherein a second mounting rib is provided on the lower case, the second mounting rib extending from the lower case to a bottom of the rotation plate, the rotation plate being coupled to the second mounting rib.
9. The angle rule of claim 8, wherein a third mounting rib is provided on the upper housing, the third mounting rib extending from the upper housing to a top end of the sun gear, the top end of the sun gear being pivotally connected to the third mounting rib.
10. An angle calculation method for a goniometer, the goniometer comprising: the measuring device comprises a first measuring arm and a second measuring arm, wherein the first measuring arm is pivoted with the second measuring arm;
the speed increasing device is connected with the first measuring arm and arranged at the pivoting position of the first measuring arm and the second measuring arm, and can increase the rotation speed of the first measuring arm and output the rotation speed;
the first angle detection unit can detect the rotation angle of the first measuring arm relative to the second measuring arm;
the second angle detection unit can detect the rotating angle of the output end of the speed increasing device relative to the first measuring arm;
the speed increasing device includes:
the rotating disc is connected with the first measuring arm and can rotate along with the first measuring arm, and an inner gear ring is arranged on the rotating disc;
the planet gear is meshed with the inner gear ring and is connected to the turntable through a pin shaft;
the sun wheel is meshed with the planet wheel and is the output end of the speed increasing device;
the transmission ratio of the turntable to the sun gear is N1: N2;
the angle detected by the first angle detection unit is A1; the angle detected by the second angle detection unit is A2;
the angle calculation method comprises the following steps:
r is 360 ° (N1/N2), and the measurement scale R is the minimum scale for equally dividing 360 ° (N2/N1);
m ═ a1/R ═ R, M is the median value calculated for a1, M is the number of integer multiples of R;
a0 ═ M + a2 × (N1/N2) + a ', a0 is the intermediate angle value, a ' is the correction value, which was corrected to the angle bar 100 before the start of the measurement so that a ' is 0;
δ＝A1-[A1/R]*R，
when δ is equal to or less than R/2 and a2 is equal to or greater than 180 °, the precise angle measurement a is a 0-R;
when δ is greater than R/2 and a2 is less than 180 °, the precise angle measurement a — a0+ R;
when (δ -R/2) × (a2-180 °) is greater than 0, the precise angle measurement a is a 0.
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