RU2263395C1 - Photoelectric angle converter - Google Patents

Abstract

FIELD: automation and computer engineering.

SUBSTANCE: proposed photoelectric angle converter that can be used for analog-to-digital conversion of shaft angular position to digital code in order to obtain digital information from controlled entities and to enter it in digital control and computing machines is installed on user's object and has case, guide cylinders disposed in diametrically opposite holes of case, shaft being encoded, indicating and metering disks with calibrated scale, radiators, and photodetectors forming optical information channels, as well as scale zero indicator in the form of hole in one of guide cylinders. Novelty is that installed in converter coaxially with shaft being encoded is coupling with flexible compensating member such as corrugated compensating member that has through hole coaxial with scale zero indicator, diameter of hole being greater than that of guide cylinder hole; coupling is joined with case on one end and with fixed part of object, on other end.

EFFECT: enhanced and enlarged functional capabilities due to facilitated jointing; enhanced precision and checkup of converter coupling with user's object.

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Description

The invention relates to automation and computer technology and can be used for analog-to-digital conversion of the angular position of the shaft into a digital code to obtain digital information from controlled objects and enter it into digital control and computing machines.

A known photoelectric angle converter mounted on a user object, comprising a housing, an encoded shaft, measuring and indicator disks, emitters and photodetectors, holders for emitters, photodetectors and indicator disk, see Yakushenkov Yu.G. "Design of optoelectronic devices", M.: Mechanical Engineering, 1981, Fig. 5.25, p.137-138.

In this converter there is no axial fixing of the encoded shaft, which reduces the reliability of mounting the converter and the accuracy of its operation.

A known photoelectric angle converter mounted on a user object, comprising a housing, an encoded shaft, made with an internal cylindrical hole for mounting a user shaft, measuring and indicator disks, emitters and photodetectors, devices for mounting holders, see Heidenhain's brochure. Germany: 1994. Models RON 255, 455. C18. Prospectus of Heidenhain. General Catalog. Germany: 2003. P.32.

In the known device, the converter is attached to the user shaft with a nut in the axial direction, and there is a gap in the radial direction between the user shaft and the converter shaft, since there is no clamping mechanism in this direction, this reduces the stiffness of the coupling of the converter with the user shaft in the radial direction.

Known photoelectric angle transducer containing a housing, a coded shaft, indicator and measuring discs, emitters and photodetectors, see patent for the invention of the Russian Federation No. 2213415 according to class. H 03 M 1/24, 1/28, publ. 2003 year

This technical is taken as a prototype of the present invention.

However, it has disadvantages.

In the photovoltaic converter prototype, it is not provided with a coaxial installation on the user shaft, because there is no through hole on the shaft, to ensure rigidity of the joint in the radial and axial direction, a docking device is required, and this complicates the design and increases its dimensions.

The present invention is based on the solution of a technical problem, which allows for axial and radial clearance of the transducer in the axial and radial directions on the movable part of the object with the possibility of adjusting the force during mounting within the transducer structure.

According to the invention, this problem is solved in such a way that the photoelectric angle transducer comprises a housing, an encoded shaft, indicator and measuring disks, emitters and photodetectors.

In the encoded shaft, a groove and a through hole with a conical and cylindrical inner surfaces are made and a mounting device is installed coaxially with the shaft, for example, in the form of a collet with an external conical surface, a mating conical surface of the through hole, and a guide sleeve with an external cylindrical surface, mating cylindrical surface of the through hole on which the installation and adjustment element is located, for example, in the form of a threaded shank with a nut that is interfaced with the shank and with the end On the left side of the encoded shaft, and inside the guide sleeve there is a limiter for the angular position of the mounting device, for example, in the form of a pin interacting with a groove.

The applicant has not identified sources containing information about technical solutions identical to the present invention, which allows us to conclude that it meets the criterion of "novelty."

Due to the implementation of the distinguishing features of the invention (in conjunction with the features indicated in the restrictive part of the formula), important new properties of the object are achieved.

Installing the mounting device and fixing the transducer in the axial and radial direction increases the reliability of the mounting and the accuracy of its operation.

The through hole in the encoded shaft provides a coaxial installation of the transducer on the user shaft and the possibility of placing a mounting device with a rigid grip of the transducer shaft and its articulation with the movable part of the user object.

The placement of the installation and adjustment element in the mounting device allows the clamp to be adjusted on the shaft of the user.

The presence of a groove in the encoded shaft, located parallel to its axis, and a limiter of the angular position of the clamping device exclude turns of the converter relative to the user’s object during mounting.

The applicant is not aware of any publications that would contain information on the influence of the distinguishing features of the invention on the achieved technical result, in this regard, according to the applicant, it can be concluded that the claimed technical solution meets the criterion of "inventive step".

The invention is illustrated by drawings, which depict in figure 1 - photoelectric angle transducer (section), figure 2 - section aa in figure 1.

The photoelectric angle transducer contains:

Building 1.

Coding shaft 2:

- groove (in shaft 2) 3,

- through hole (in shaft 2) 4,

- conical inner surface (in the hole 4) 5,

- cylindrical inner surface (in hole 4) 6.

Mounting device 7:

- collet (device 7) 8,

- guide sleeve (device 7) 9,

- installation and adjustment element (bushings 9) 10,

- threaded shank (element 10) 11,

- nut (element 10) 12,

- limiter of the angular position (inside the sleeve 9) 13,

- pin (limiter 13) 14.

Indicator dial 15.

Measuring disc 16.

Emitters 17.

Photodetectors 18.

The photoelectric angle converter comprises a housing 1, an encoded shaft 2, an indicator 15 and a measuring 16 discs, emitters 17 and photodetectors 18. A groove 3 and a through hole 4 are made in the encoded shaft 2. The through hole 4 has a conical 5 and a cylindrical 6 inner surface. A fixing device 7 is installed in the hole 4 of the shaft 2. The fixing device 7 preferably comprises a collet 8 with at least three petals, and a guiding device 9. The collet 8 is made with the outer conical surface of the mating conical surface 5 of the through hole 4, and the guide sleeve 6 - with the outer cylindrical surface of the mating cylindrical surface 6 of the through hole 4 of the encoded shaft 2. On the guide sleeve 9 is the installation and adjustment element 10, preferably in the form of a threaded needle a nut 11 with a nut 12. A nut 12 is coupled with a threaded shank 11 and with the end part of the encoded shaft 2. Inside the guide sleeve 9, an angular position limiter 13 of the mounting device 7 is installed, preferably in the form of a font 14, which interacts with the groove 3 of the encoded shaft 2. Photoelectric the angle Converter operates as follows.

The angular movement of the encoded shaft 2 from the user shaft (not shown) leads to the rotation of the measuring disk 16 in the housing 1, while the light flux from the emitters 17, passing through the measuring disk 16 and the indicator disk 15, enters the photodetectors 18, not covered by the disk 16. Each rotation angle of the encoded shaft 2 with the measuring disk 16 has its own combination of electrical signals coming from the photodetectors 18, necessary for generating a digital code of the converter, which are an expression of this angle of rotation.

After installing the converter on a user shaft (not shown), the nut 12 is rotated, while the mounting device 7 moves axially inside the encoded shaft 2, and the petals of the collet 8 rigidly enclose the user shaft, ensuring the converter is articulated with the movable part of the user object. The mounting device 7 provides reliable backlash-free mounting of the converter on the moving (rotating) part of the user’s object, both in the axial and in the radial direction. The nut 12 controls the clamping force of the collet 8 on the user shaft. The limiter of the angular position 13, made preferably in the form of a pin 14, interacting with the groove 3 of the encoded shaft 2, eliminates the reversal of the transducer relative to the user's object when carrying out mounting work.

The proposed photoelectric angle converter was manufactured industrially in the workshop of the Izmeren plant, and the tests carried out confirm its compliance with the criterion of “industrial applicability”.

The proposed photoelectric angle transducer makes it possible to provide a backlash-free mounting of the transducer in axial and radial directions on the moving part of the object with the possibility of adjusting the mounting force, since

- the converter is fixed in axial and radial directions,

- a mounting device with a rigid covering of the shaft of the transducer is placed in the through hole of the encoded shaft within the axial dimensions of the transducer,

- installation and adjustment element is placed in the mounting device,

- the limiter of the angular position interacts with the groove of the encoded shaft.

Claims (1)

A photoelectric angle transducer comprising a housing, an encoded shaft, indicator and measuring disks, emitters and photodetectors, characterized in that a groove and a through hole with conical and cylindrical internal surfaces are made in the encoded shaft and a mounting device is installed coaxially with the shaft, for example, in the form of a collet with an outer conical surface, a mating conical surface of the through hole, and a guide sleeve with an outer cylindrical surface, a mating cylindrical surface through hole, on which the installation and adjustment element is located, for example, in the form of a threaded shank with a nut that is interfaced with the shank and the end part of the encoded shaft, and inside the guide sleeve there is a limiter for the angular position of the mounting device, for example, in the form of a pin interacting with a groove.

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