阅读说明：本技术 一种用于多路光纤旋转连接器传动机构的检测方法 (Detection method for transmission mechanism of multi-path optical fiber rotary connector ) 是由 徐�明 胡长明 魏忠良 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种用于多路光纤旋转连接器传动机构的检测方法,所述检测方法采用的设备包括平直仪、轴角编码器和正多面体棱镜,所述正多面体棱镜、被测多路光纤旋转连接器和所述轴角编码器从上至下依次同轴心安装；所述轴角编码器包括轴角编码器转动端；所述正多面体棱镜包括棱镜主体,所述棱镜主体的横截面为正多边形的柱状结构,顶面和底面平行,侧面与顶、底面垂直；所述检测方法包括：将所述平直仪射出的光束垂直打在所述正多面体棱镜的每个侧面,记录每次所述轴角编码器转动端转动的实际数值,所述实际数值与所述轴角编码器转动端转动的理论数值之差为所述多路光纤旋转连接器的传动误差。(The invention discloses a detection method for a transmission mechanism of a multi-path optical fiber rotary connector, wherein the detection method adopts equipment comprising a straight instrument, an axial angle encoder and a regular polyhedron prism, wherein the regular polyhedron prism, the multi-path optical fiber rotary connector to be detected and the axial angle encoder are coaxially arranged from top to bottom in sequence; the shaft angle encoder comprises a rotating end of the shaft angle encoder; the regular polyhedron prism comprises a prism main body, the cross section of the prism main body is of a regular polygonal columnar structure, the top surface and the bottom surface are parallel, and the side surface is vertical to the top surface and the bottom surface; the detection method comprises the following steps: and vertically irradiating the light beam emitted by the collimator on each side surface of the regular polyhedron prism, recording the actual numerical value of the rotation end rotation of the shaft angle encoder every time, wherein the difference between the actual numerical value and the theoretical numerical value of the rotation end rotation of the shaft angle encoder is the transmission error of the multi-path optical fiber rotary connector.)

1. A detection method for a transmission mechanism of a multi-path optical fiber rotary connector is characterized in that,

the equipment adopted by the detection method comprises a straight instrument, an axial angle encoder and a regular polyhedron prism, wherein the regular polyhedron prism, the detected multi-path optical fiber rotary connector and the axial angle encoder are coaxially arranged from top to bottom in sequence; the shaft angle encoder comprises a rotating end of the shaft angle encoder; the regular polyhedron prism comprises a prism main body, the cross section of the prism main body is of a regular polygonal columnar structure, the top surface and the bottom surface are parallel, and the side surface is vertical to the top surface and the bottom surface;

the detection method comprises the following steps: and vertically irradiating the light beam emitted by the collimator on each side surface of the regular polyhedron prism, recording the actual numerical value of the rotation end rotation of the shaft angle encoder every time, wherein the difference between the actual numerical value and the theoretical numerical value of the rotation end rotation of the shaft angle encoder is the transmission error of the multi-path optical fiber rotary connector.

2. The detecting method for the multi-channel optical fiber rotary connector transmission mechanism according to claim 1, wherein when the rotation speed ratio of the optical fiber rotary connector transmission adjusting mechanism is 2: 1, assuming that the number of the side faces of the regular polyhedron prism is X, the angle of each rotation of the regular polyhedron prism is Y, and the theoretical value of each rotation angle of the rotation end of the axial angle encoder is Z, then

Y＝360/X；

Z＝Y/2。

3. The method of claim 2, wherein X is selected such that Y is an integer after calculation, and the greater the value of X, the more accurate the measurement of the transmission error.

4. The method of claim 3, wherein the shaft encoder further comprises a shaft encoder fixing end, the shaft encoder rotating end is provided with a rotating dial, and the shaft encoder fixing end is provided with a fixing disc; the fixed disc is arranged above the rotary driving plate; the rotary drive plate, the fixed disc and the shaft angle encoder are coaxially arranged;

the tested optical fiber rotary connector comprises an optical fiber rotary connector fixing end, an optical fiber rotary connector transmission adjusting mechanism and an optical fiber rotary connector rotating end; the rotary drive plate is connected with the optical fiber rotary connector transmission adjusting mechanism; the fixed disc is connected with the fixed end of the optical fiber rotary connector.

5. The detecting method for the multi-channel optical fiber rotary connector transmission mechanism according to claim 4, wherein a cylindrical protrusion is arranged at the center of the rotating dial, a through hole is arranged at the center of the fixed disk, and the cylindrical protrusion passes through the through hole and is connected with the optical fiber rotary connector transmission adjusting mechanism.

6. The detecting method for the multi-path optical fiber rotary connector transmission mechanism according to claim 5, wherein the regular polyhedron prism further comprises a prism positioning step, and the prism positioning step is arranged below the prism main body and is used for positioning and connecting the regular polyhedron prism with the rotary end of the optical fiber rotary connector and ensuring that the regular polyhedron prism and the rotary end of the optical fiber rotary connector rotate synchronously.

Technical Field

The invention belongs to the technical field of optical signal rotation transmission, and particularly relates to a detection method for a transmission mechanism of a multi-path optical fiber rotary connector.

Background

The optical Fiber Rotary connector (FORJ) is also called optical Fiber slip ring, optical Fiber Rotary Joint, optical hinge, etc. and is used to solve the transmission problem of optical signal between opposite rotating parts, i.e. to ensure that the transmission of optical signal is not interrupted by rotation. Compared with the traditional electric connector, the optical fiber rotary connector has the following advantages: the light is used for signal transmission, so that the electromagnetic leakage is avoided, the confidentiality is good, and the electromagnetic interference is prevented; no contact transmission, no abrasion, long service life, and can reach 500 ten thousand revolutions. The friction is avoided, and the device can be used in flammable and explosive environments; the transmission bandwidth is far greater than that of the electric connector, and the electric connector is matched with a wavelength division multiplexer for use, so that the bandwidth can be doubled; the allowed rotating speed is high and can reach ten thousand revolutions per minute at most. The optical fiber rotary connector can realize 360-degree rotary transmission of optical signals from the fixed part to the rotating part.

The general optical fiber rotary connector adopts the optical transmission principle of a dove prism, and utilizes transmission mechanisms with different structural forms to realize the speed reduction of 2: 1, the realization method has very high requirement on the transmission precision of the transmission mechanism, and the indexes are extremely deteriorated due to small deviations of processing and assembly. The transmission precision of the transmission mechanism of the multi-path optical fiber rotary connector is the key for developing the multi-path optical fiber rotary connector, so that a high-precision transmission precision detection method is required for the quality guarantee of designed data support and production.

Disclosure of Invention

Aiming at the problems and the defects in the prior art, the invention provides a detection method for a transmission mechanism of a multi-path optical fiber rotary connector, which solves the problem of precision detection of the transmission mechanism of the multi-path optical fiber rotary connector and provides guarantee for development and production of the multi-path optical fiber rotary connector.

The invention is realized by the following technical scheme:

a detection method for a transmission mechanism of a multi-path optical fiber rotary connector adopts equipment comprising a straight instrument, an axial angle encoder and a regular polyhedron prism, wherein the regular polyhedron prism, the multi-path optical fiber rotary connector to be detected and the axial angle encoder are coaxially arranged from top to bottom in sequence; the shaft angle encoder comprises a rotating end of the shaft angle encoder; the regular polyhedron prism comprises a prism main body, the cross section of the prism main body is of a regular polygonal columnar structure, the top surface and the bottom surface are parallel, and the side surface is vertical to the top surface and the bottom surface; the detection method comprises the following steps: and vertically irradiating the light beam emitted by the collimator on each side surface of the regular polyhedron prism, recording the actual numerical value of the rotation end rotation of the shaft angle encoder every time, wherein the difference between the actual numerical value and the theoretical numerical value of the rotation end rotation of the shaft angle encoder is the transmission error of the multi-path optical fiber rotary connector.

Further, when the rotation speed ratio of the optical fiber rotary connector transmission adjusting mechanism is 2: 1, the number of the side surfaces of the regular polyhedron prism is set as X, the angle of each rotation of the regular polyhedron prism is set as Y, and the theoretical value of each rotation angle of the rotation end of the shaft angle encoder is set as Z, then

Y＝360/X；

Z＝Y/2。

Furthermore, X selects a numerical value which can enable Y to be an integer after calculation, and the larger the numerical value of X is, the more accurate the precision measurement of the transmission error is.

Furthermore, the shaft angle encoder also comprises a shaft angle encoder fixing end, wherein a rotating drive plate is arranged on the rotating end of the shaft angle encoder, and a fixed disc is arranged on the fixing end of the shaft angle encoder; the fixed disc is arranged above the rotary driving plate; the rotary drive plate, the fixed disc and the shaft angle encoder are coaxially arranged; the tested optical fiber rotary connector comprises an optical fiber rotary connector fixing end, an optical fiber rotary connector transmission adjusting mechanism and an optical fiber rotary connector rotating end; the rotary drive plate is connected with the optical fiber rotary connector transmission adjusting mechanism; the fixed disc is connected with the fixed end of the optical fiber rotary connector.

Furthermore, the circle center of the rotary driving plate is provided with a cylindrical bulge, a through hole is formed in the circle center of the fixed disc, and the cylindrical bulge penetrates through the through hole to be connected with the optical fiber rotary connector transmission adjusting mechanism.

Further, regular polyhedron prism still includes prism location step, prism location step sets up in the below of prism main part for regular polyhedron prism and the location of optic fibre swivelling joint ware rotation end are connected and are guaranteed and rotatory with optic fibre swivelling joint ware rotation end synchronous revolution.

The invention has the beneficial effects that:

the detection method for the transmission mechanism of the multi-path optical fiber rotary connector, provided by the invention, aims at the realization principle of the multi-path optical fiber rotary connector, is simple in structure, solves the problem of precision detection of the transmission mechanism of the multi-path optical fiber rotary connector, provides guarantee for development and production of the multi-path optical fiber rotary connector, is simple in detection method and high in detection precision, and is suitable for market popularization and application.

Drawings

FIG. 1 is a diagram of the apparatus arrangement of the present invention;

FIG. 2 is a schematic view of a 5-sided cube prism according to the present invention;

FIG. 3 is a top view of FIG. 2;

wherein: 1. a straightening instrument; 2. a shaft encoder; 2-1, rotating end of shaft encoder; 2-2, fixing end of shaft encoder; 3. rotating the drive plate; 3-1, a first positioning step; 3-2, a second positioning step; 4. fixing the disc; 4-1, a third positioning step; 4-2, a fourth positioning step; 5. a regular polyhedron prism; 6. the optical fiber rotary connector to be detected; 6-1, fixing end of optical fiber rotary connector; 6-2, an optical fiber rotary connector transmission adjusting mechanism; 6-3, and a rotating end of the optical fiber rotating connector.

Detailed Description

The preferred mechanisms and methods of motion realization of the present invention are further described below in conjunction with the figures and the detailed description.

To better explain the detection method for the transmission mechanism of the multi-path optical fiber rotary connector in this embodiment, first, the structure of the optical fiber rotary connector to be detected will be described.

An optical fiber rotary connector is a component for realizing optical signal transmission between a rotary platform and a static platform, generally adopts the optical transmission principle of a dove prism, and utilizes a corresponding transmission mechanism to realize a rotating speed ratio of 2: 1 so as to realize the optical signal transmission between the rotary platform and the static platform.

As shown in fig. 1, the optical fiber rotary connector 6 to be tested includes an optical fiber rotary connector fixing end 6-1, an optical fiber rotary connector transmission adjusting mechanism 6-2, and an optical fiber rotary connector rotating end 6-3; the optical signal is transmitted from the rotating output end 6-3 of the optical fiber rotating connector to the fixed end 6-1 of the optical fiber rotating connector, and the rotating speed ratio of 2: 1 is adjusted between the optical fiber rotating connector and the fixed end 6-1 through the optical fiber rotating connector transmission adjusting mechanism 6-2. The optical fiber rotary connector transmission adjusting mechanism 6-2 generally adopts a bevel gear planetary gear train to realize the rotation speed ratio of 2: 1.

As shown in figure 1, the detector for the transmission mechanism of the multi-path optical fiber rotary connector comprises a straight instrument 1, an axial angle encoder 2, a rotary dial 3, a fixed disc 4 and a regular polyhedron prism 3.

The straightness instrument 1 can adopt a conventional straightness instrument in the prior art, and can ensure that a light beam emitted by the straightness instrument 1 is perpendicularly incident into the regular polyhedron prism 4.

The shaft angle encoder 2 can adopt a shaft angle encoder commonly used in the prior art, and comprises a shaft angle encoder rotating end 2-1 and a shaft angle encoder fixing end 2-2, the shaft angle encoder fixing end 2-2 is connected with a shell of the shaft angle encoder 2, and the shaft angle encoder rotating end 2-1 is used as a rotating shaft of the shaft angle encoder 2 and rotates around the central axis of the shaft angle encoder 2.

The rotary driving plate 3 is made of metal, is a circular disc with a cylindrical bulge 3-2 at the center of the circle, is provided with a first positioning step 3-1 at the edge, is connected with the edge of the rotary end 2-1 of the shaft angle encoder through the first positioning step 3-1, is coaxially arranged with the rotary end 2-1 of the shaft angle encoder, and is fixed through a screw, so that the rotary end 2-1 of the shaft angle encoder and the rotary driving plate 3 can coaxially and synchronously rotate; the top end of the bulge 3-2 is provided with a second positioning step 3-3, the second positioning step 3-3 is coaxially fixed with an optical fiber rotary connector transmission adjusting mechanism 6-2 of a tested optical fiber rotary connector 6, and the optical fiber rotary connector transmission adjusting mechanism is fixed through a screw, so that the coaxial synchronous rotation of the rotary input end 6-2 of the optical fiber rotary connector and the rotary dial plate 3 is ensured.

The fixed disc 4 is made of metal, is a cylindrical housing, is arranged above the rotary driving plate 3 and is coaxially arranged with the rotary driving plate 3; the edge of the fixed disk 4 is provided with a third positioning step 4-1, and the fixed disk 4 is fixedly connected with a fixed end 2-2 of the shaft angle encoder 2 through the third positioning step 4-1; a through hole is formed in the center of the fixed disc 4, a fourth positioning step 4-2 is arranged on the periphery of the through hole, and the fixed disc 4 is fixedly connected with an optical fiber rotary connector fixed end 6-1 of a measured optical fiber rotary connector 6 through the fourth positioning step 4-2; the cylindrical protrusion 3-2 of the rotary dial 3 passes through the through hole to be connected with the rotary input end 6-2 of the optical fiber rotary connector.

A regular polyhedron prism 5 including a prism main body and a prism positioning step; the prism main body is a prism with a cross section of a regular polygon columnar structure, the top surface and the bottom surface are parallel, and the side surface is vertical to the top surface and the bottom surface; the prism positioning step is arranged below the prism main body and used for positioning and connecting the regular polyhedron prism and the rotating end 6-3 of the optical fiber rotating connector, and the synchronous rotation of the prism positioning step and the rotating end 6-3 of the optical fiber rotating connector is guaranteed through screw fixation.

On the light beam vertical incidence that squareness appearance 1 sent 4 regular polyhedron prisms's side, the turned angle of shaft angle encoder rotation end was the face number of 360/regular polyhedron prisms's side, promptly:

when the rotating speed ratio of the optical fiber rotary connector transmission adjusting mechanism 6-2 is 2: 1,

setting the number of the side surfaces of the regular polyhedron prism as X, the angle of each rotation of the regular polyhedron prism as Y, the theoretical value of each rotation angle of the rotation end of the shaft angle encoder as Z,

then Y is 360/X;

Z＝Y/2；

the transmission error of the optical fiber rotary connector transmission adjusting mechanism 6-2 is Z-actual measured value.

For the convenience of calculation, X is preferably selected to be a value that enables Y to be an integer after calculation, such as X being 3, 4, and 5 …, and the larger the value of X, the more accurate the measurement of the transmission error.

Fig. 2 and 3 are a schematic view and a top view of a three-dimensional structure with 5 sides of a regular polyhedron prism, respectively.

Taking a regular 24-sided prism with X being 24 as an example, the following working principle of the present embodiment is explained:

as shown in figure 1, the fixed end 6-1 of the optical fiber rotary connector is connected with the fixed end 2-2 of the shaft angle encoder through a fixed disc 4, the transmission adjusting mechanism 6-2 of the optical fiber rotary connector is connected with the rotating end 2 of the shaft angle encoder through a rotating dial plate 3, and the rotating end 6-3 of the optical fiber rotary connector is connected with a regular 24-face prism.

When the rotation end 2-1 of the shaft angle encoder rotates, the optical fiber rotary connector transmission adjusting mechanism 6-2 is driven to rotate, the optical fiber rotary connector transmission adjusting mechanism 6-2 drives the optical fiber rotary connector rotation end 6-3 to rotate, the optical fiber rotary connector rotation end 6-3 drives the regular 24-face prism to rotate, light emitted by the straightener perpendicularly hits each side face of the regular 24-face prism, images formed after reflection on each side face coincide, and the light is returned as a rotation reference of the rotation end 2-1 of the shaft angle encoder, when the rotation end 2-1 of the shaft angle encoder rotates to one side face of the regular 24-face prism, the shaft angle encoder 2 can be rotated to calculate the rotation angle of the rotation end 2-1 of the shaft angle encoder, and the difference value between the angle and the ideal rotation angle is the transmission error.

Because the transmission ratio of the measured optical fiber rotary connector 6 is always 2: 1, every time the regular 24-face prism rotates by 15 degrees (360/24 is 15), the rotating end of the shaft angle encoder should rotate by 7.5 degrees, the difference between the angle change calculated by the shaft angle encoder and 7.5 degrees is the transmission precision error, and the average transmission precision error can be obtained after multi-point test.

That is to say, many angle measurement can be realized with the combination of positive 24 face body prism to straightness appearance 1, as above-mentioned, when adopting positive 24 face body prism, the parallel light of straightness appearance 1 output is beaten perpendicularly on a side of positive 24 face body prism, but the light of reflection back returns in the original way, can read a scale on the straightness appearance as the benchmark, when positive 24 face body prism is rotatory, when the light of straightness appearance output is perpendicular with positive 24 face body prism lower side, the light of reflection back should coincide with former scale, positive 24 face body prism is rotatory 15 this moment. Based on the principle, when the rotating end 6-3 of the optical fiber rotating connector 6 to be detected rotates 15 degrees at each time (the rotating speed ratio is 2: 1), the transmission precision error can be accurately monitored by comparing the light reflection of the collimator and each side surface of the regular 24-face prism. Namely, when the rotating end 6-3 of the optical fiber rotating connector rotates 15 degrees every time, after the speed is reduced by the optical fiber rotating connector transmission adjusting mechanism 6-2, the rotating end 1 of the shaft angle encoder theoretically rotates 7.5 degrees, at the moment, the rotating angle of the rotating end 2-1 of the shaft angle encoder is read, the difference between the theoretical value and the theoretical value is the transmission error when the optical fiber rotating connector transmission adjusting mechanism 6-2 rotates 7.5 degrees, 48 points can be read when the optical fiber rotating connector transmission adjusting mechanism 6-2 rotates a circle (the rotating speed ratio is 2: 1, the optical fiber rotating connector transmission adjusting mechanism 6-2 rotates a circle, the regular 24-sided prism rotates two circles, so the 48 points), and the average value is obtained to obtain the average error of the transmission precision.

The working process of the embodiment is as follows:

1. preparation work: calculating a theoretical value Z of each rotation angle of the rotation end of the shaft angle encoder according to the selected regular polyhedron prism 5;

2. installing and arranging a detector: the rotary drive plate 3, the fixed disc 4, the measured optical fiber rotary connector 6 and the regular polyhedron prism 5 are sequentially arranged on the shaft angle encoder 2 through positioning steps; arranging and adjusting the straight instrument 1 to enable the light beam emitted by the straight instrument to vertically strike the side surface of the regular polyhedron prism;

3. detecting and recording: starting the shaft angle encoder 2, and recording the actual rotation angle value of the rotation end 2-1 of the shaft angle encoder after the regular polyhedron prism 5 rotates each time;

4. and (3) calculating the error of the transmission precision of the tested optical fiber rotary connector 6: and subtracting the actual rotation angle value from the theoretical value Z to obtain an error value of the transmission precision, and obtaining an average error value according to multiple rotation measurements.

Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.