RU51198U1 - INDUCTIVE MOVEMENT CONVERTER - Google Patents

Abstract

The utility model relates to measuring technique and can be used to convert linear displacements into an electrical signal. The present utility model is based on solving a problem that allows reducing dimensions, simplifying the structural performance of individual units, improving assembly and conducting control operations with a guiding device, an armature, inductors, and other structural elements. The inductive transducer contains a housing, a guiding device with a measuring rod, anti-rotation device, a separator and balls, an armature with a ring ferromagnet, rigidly connected to the measuring rod, and inductors located in the cores. The housing is made up of integral upper and lower parts "mounted coaxially and rigidly fastened together, with inductive coils placed in the upper part, and a guiding device in the lower part, the anti-rotation device of which is made in the form of a longitudinal groove with a spherical surface made on the measuring rod along it axis parallel to its cylindrical generatrix, and the conjugate spherical surface of at least two balls installed in the separator, interacting, as with longitudinal groove, and the inner cylindrical surface of the lower parts of the composite body, the radius of the spherical surface of the longitudinal groove greater than the radius of its beads, and a radius greater than the radius of balls past actual guide device.

Description

The utility model relates to measuring technique and can be used to convert linear displacements into an electrical signal.

Known inductive differential transducer comprising a housing, a measuring rod, a magnetic system with inductors and an armature rigidly connected to the measuring rod, a guiding device on elastic elements connected with the measuring rod, I. Belkin Means of linear-angular measurements. M .: Mechanical Engineering, 1987. Fig. 5. S.348-351.

This converter has large diametric dimensions with a small range of operation.

Known inductive sensor of dimensions, comprising a housing, ferromagnetic glasses with inductors placed in them, a measuring rod in the rails and a ferromagnetic armature, rigidly connected to the measuring rod, SU No. 1027504 A1, G 01 B 7/00, 1983.07.07.07.

The case of this sensor is made integral, has a complex structure - different diameters of the guides and the magnetic circuit, which complicates the mounting of the sensor in standard racks.

A differential inductive displacement sensor is known, comprising four coaxially mounted stationary ferromagnetic cores with windings located on the respective cores, two

ferromagnetic anchors installed with the possibility of linear movement, and measuring rods attached to the corresponding anchors, RU No.2017059 C1, G 01 B 7/00, 1994.07.30.

The disadvantage of this sensor is the design complexity and large dimensions.

A device for measuring linear displacements is known, including an inductive transducer comprising a housing, guides on elastic elements with a measuring rod, an armature rigidly connected to the measuring rod, cores with inductors, RU No. 22555512 C1, GO No. 7 / 00,2005.01.27.

The inductive displacement transducer of the known device is highly accurate, but it provides a small measurement range, and the presence of elastic guides determines large diametric dimensions.

Known inductive probe containing a housing, a measuring rod, inductance coil, an anchor connected to the rod, an output cable with a clamping device. Prospectus of the company "Mahr". Production measuring equipment. Manual measuring instruments, 1998. S.4-15 --- 4-17.

The known inductive probe with a small outer diameter has a monolithic housing and large dimensions.

Known inductive transducer containing a housing, a guiding device with a measuring rod, anti-rotation device, a separator and balls, an anchor with an annular ferromagnet, rigidly connected to the measuring rod, and inductors located in the cores. Prospectus of the company "TESA" Measuring systems for quality assurance ISO 9001, 2003. C. L-4, L-5.

This technical solution is taken as a prototype of this utility model.

However, it has disadvantages.

The prototype inductive transducer has a monolithic housing of a large axial size, which complicates its separate assembly and verification of the operation of the guide device, as well as quality control of the armature and inductors. In addition, the anti-rotation device includes conical rollers placed on the axes of rotation, which increases its dimensions.

The present utility model is based on solving a problem that allows reducing dimensions, simplifying the structural performance of individual units, improving assembly and conducting control operations with a guiding device, an armature, inductors, and other structural elements.

According to a utility model, this problem is solved due to the fact that the inductive displacement transducer comprises a housing, a guiding device with a measuring rod, an anti-rotation device, a separator and balls, an anchor with an annular ferromagnet rigidly connected to the measuring rod, and inductors located in the cores.

The housing is made up of integral upper and lower parts mounted coaxially and rigidly fixed to each other, with inductive coils placed in the upper part, and a guiding device in the lower part, the anti-rotation device of which is made in the form of a longitudinal groove with a spherical surface made on the measuring rod along its an axis parallel to its cylindrical generatrix and a conjugate spherical surface with at least two

balls installed in the separator, interacting with both the longitudinal groove and the inner cylindrical surface of the lower part of the composite body, while the radius of the spherical surface of the longitudinal groove is greater than the radius of its balls, and the radius of the latter is larger than the radius of the balls of the actual guiding device.

The applicant has not identified sources containing information on technical solutions identical to this utility model, which allows us to conclude that it meets the criterion of "novelty."

The essence of the utility model is illustrated by drawings, which depict:

figure 1 inductive transducer displacements in the context;

in Fig.2 a section aa in Fig. one.

Inductive displacement transducer contains:

Composite housing 1,

- lower part (composite housing 1) 2,

- the inner cylindrical surface (lower part 2) 3,

- the upper part (of the composite housing 1) 4,

- grooves (in the lower 2 and upper 4 parts) 5,

- epoxy connectors (in grooves 5) 6. Guide device (in the lower part 2) 7,

- measuring rod (in the guiding device 7) 8,

- anti-rotation device in the form of a longitudinal groove with a spherical surface (on the measuring rod 8) 9,

- outer cylindrical surface (measuring rod 8) 10,

- separator (guiding device 7) 11,

- balls (in the separator 11, interacting with the outer cylindrical surface 10 of the measuring rod 8 and the inner cylindrical surface 3 of the lower part 2 of the housing 1) 12,

- balls (in the separator 11, interacting with the longitudinal groove 9 and the inner cylindrical surface 3 of the lower part 2 of the housing 1) 13,

- measuring tip (on measuring rod 8) 14.

Elastic protective sleeve (between bottom 2 and measuring rod 8) 15.

Anchor (at the top of 4) 16,

- ring ferromagnet (anchors 16) 17.

Inductor (at the top of 4) 18,

- core (inductor 18) 19.

Inductor (in the upper part 4) 20,

- core (inductors 20) 21.

Closing spring 22.

The inductive transducer contains a composite housing 1, a guiding device 7 with a measuring rod 8, an armature 16 and inductors 18 and 20.

The composite housing 1 is made of upper 4 and lower 2 parts. In the upper 4 and lower 2 parts there are grooves 5. The upper 4 and lower 2 parts are mounted coaxially and rigidly fastened to each other by, for example, epoxy connectors 6 located in the grooves 5, or, for example, by means of a tight fit (not considered).

In the lower part 2 of the composite housing 1 with an inner cylindrical surface 3 there is a guide device 7. The guide device 7 includes a measuring device

a rod 8 with an outer cylindrical surface 10, a separator 11 with balls 12. Balls 12 interact with the outer cylindrical surface 10 of the measuring rod 8 and the inner cylindrical surface 3 of the lower part 2 of the housing 1.

The measuring rod 8 is equipped with a measuring tip 14 and is interfaced with the closing spring 22. The closing spring 22 provides the pressure of the measuring tip 14 to the measured part. Between the lower part 2 of the composite housing 1 and the measuring rod 8 is placed an elastic protective sleeve 15, which protects the guide device 7 from contamination.

An anti-rotation device in the form of a longitudinal groove with a spherical surface 9 is made on the measuring rod 8 along its axis. The longitudinal groove 9 is parallel to the cylindrical generatrix of the measuring rod 8. At least two balls 13 are installed in the separator 11. The balls 13 are conjugated with the spherical surface of the longitudinal grooves 9. Balls 13 interact as with a longitudinal groove

9. as well as the inner cylindrical surface 3 of the lower part 2 of the housing 1. The radius of the spherical surface of the longitudinal groove 9 is greater than the radius of the balls 13, which eliminates the jamming of the measuring rod 8 during linear movements of the transducer. In turn, the radius of the balls 13 is greater than the radius of the balls 12 of the guide device 7.

An anchor 16 and inductors 18 and 20 are located in the upper part 4 of the composite housing 1. The anchor 16 is made with an annular ferromagnet 17, coaxially fixed to the measuring rod 8 and is rigidly connected with it. Inductors 18 and 20 are located in the cores 19 and 21, respectively.

The inductive transducer performs measurements as follows.

The inductive converter is mounted in standard racks for the outer surface of the composite housing 1.

The measuring rod 8 is moved relative to the lower part 2 of the composite housing 1, while the movement of the armature 16 leads to a change in the inductance of the coils 18 and 20 of the inductive transducer and then to a change in the electrical signal. Proportional to the movement of the measuring rod 8 with the armature 16, the electric signal enters the registration device (not shown), where it is processed and the result of the measurement of displacements is produced.

The execution of the housing 1 composite and the installation of parts 2 and 4 coaxially ensures their separate manufacture, simplifies assembly and improves the control operations with structural elements and units located in parts 2 and 4 of the composite housing 1. The presence of a longitudinal groove 9 on the measuring rod 8, installation in the separator 11 of the two balls 13, conjugated with the spherical surface of the longitudinal groove 9, the interaction of the balls 13 with the inner cylindrical surface 3 of the lower part 2 of the composite housing 1, which is common for ystviya balls 12 of the guide device 7, simplifies the fulfillment of these assemblies and reduces the radial dimensions of the transducer.

The proposed inductive displacement transducer was manufactured industrially at the Izmeron plant, which is confirmed by the tests of an experimental batch, and this, according to the applicant, determines its compliance with the criterion of “industrial applicability”.

Claims (1)

An inductive displacement transducer comprising a housing, a guiding device with a measuring rod, an anti-rotation device, a separator and balls, an armature with a ring ferromagnet, rigidly connected to the measuring rod, and inductors located in the cores, characterized in that the housing is made up of upper and lower parts mounted coaxially and rigidly bonded to each other, with placement in the upper part of the inductive coils, and in the lower part of the guide device, the anti-rotation device It is made in the form of a longitudinal groove with a spherical surface, made on the measuring rod along its axis, parallel to its cylindrical generatrix, and a conjugated spherical surface with at least two balls installed in the separator, interacting with both the longitudinal groove and the inner cylindrical surface of the lower part of the composite body, while the radius of the spherical surface of the longitudinal groove is greater than the radius of its balls, and the radius of the latter is greater than the radius of the balls with Generally a guiding device.