RU51197U1 - 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 to increase the measurement range with high transducer sensitivity and small axial dimensions, simplify assembly, and improve control operations with the magnetic system and verify the operation of structural measuring elements. The inductive displacement transducer comprises a housing, a guiding device with a measuring rod, a magnetic system with inductors located in the cores, and an armature including an annular ferromagnet, rigidly connected to the measuring rod, and a device for electrically connecting inductive coils with an output shielded cable. The casing is made up of two casing parts mounted coaxially and rigidly fastened together, containing the casing part of the guiding device and the casing part of the magnetic system with the placement of an additional two ferrite rings mounted coaxially with the cores "located on the outer end sides of each of the cores having diameters equal to the corresponding dimensions of the cores, and axial sizes equal to the corresponding axial sizes of the inductors, annular ferromagnet armature Execute the composite, at least two annular ferrites, and the body portion of the magnetic system is provided with a threaded sleeve, wherein the electrical connection device taken inductive coupling coils in a circuit board, facing the ferrite ring and, respectively, to the inductor.

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, an output cable with a clamping device, and an electrical connection device for inductive coils with an output cable in the form of pins on which the conclusions of coils and an output cable are soldered, Belkin IM Means of linear-angular measurements. M .: Mechanical Engineering, 1987. Fig. 5. S.348-351.

This converter has a small operating range and large radial dimensions.

A known inductive size sensor containing a housing, a measuring rod in the rails, a magnetic system with ferromagnetic cups, placed inductance coils, and a ferromagnetic armature rigidly connected to the measuring rod, SU No. 1027504 Al, G 01 B 7 / 00.1983.07. 07.

The body of this sensor is made integral, has a complex structure - different diametrical dimensions of the guides and

magnetic circuit, which complicates the mounting of the sensor in standard racks.

A device for measuring linear displacements, including an inductive transducer, comprising a housing, guides on elastic elements with a measuring rod, a magnetic system with an armature rigidly connected to the measuring rod, and cores with inductors, RU No. 2245512 C1, G 01 B 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, a magnetic system with inductors and an armature connected to the rod, and 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, a magnetic system with inductors located in the cores, and an armature comprising an annular ferromagnet, rigidly connected to the measuring rod, and a device for electrically connecting inductive coils with an output shielded cable. 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 case of large axial size, which complicates its separate assembly and verification of the operation of the measuring elements, as well as quality control of the armature and inductors. In addition, the material used for the cores of the inductors. Has a low magnetic permeability, therefore, to ensure a large range of operation of the converter, the inductors must have large axial dimensions, and their cores must be made as a single part, which complicates the separate control of the inductance of the coils when their installation. In addition, the anchor with a ferromagnet is made in the form of a single monolithic part, which is a technological challenge for transducers that provide a wide range of measurements and have small diametrical dimensions.

This utility model is based on solving a problem that allows to increase the measurement range with high transducer sensitivity and small axial dimensions, simplify assembly, and improve control operations with the magnetic system and verify the operation of structural measuring 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, a magnetic system with inductors located in

cores, and an anchor, including an annular ferromagnet, rigidly connected to the measuring rod, and a device for electrical connection of inductive coils with an output shielded cable.

The casing is made up of two casing parts mounted coaxially and rigidly fastened together, containing the casing part of the guiding device and the casing part of the magnetic system with an additional two ferrite rings placed in it coaxially with the cores placed on the outer end sides of each of the cores having diametric dimensions equal to the corresponding dimensions of the cores, and axial sizes equal to the corresponding axial sizes of the inductors, the annular ferromagnet of the armature made of at least two ring ferrites, and the body of the magnetic system is made with a threaded sleeve, in which the device for the electrical connection of inductive coils is placed in the form of a connecting printed circuit board facing the ferrite ring and, accordingly, to the inductance coils.

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 - node A in Fig. one.

In Fig.3 - node B in Fig. one.

Inductive displacement transducer contains:

Composite housing 1,

- the housing of the guide device (composite housing 1) 2,

- the hull of the magnetic system (composite housing 1) 3,

- grooves (in body parts 2 and 3) 4,

- epoxy connectors (in grooves 4) 5. Guide device (in the body part 2) 6,

- measuring rod (in the guiding device 6) 7,

- measuring tip (on measuring rod 7) 8.

Elastic protective sleeve (between the body part 2 and the measuring rod 7) 9.

Magnetic system (in case 3) 10,

Anchor (magnetic system 10) 11,

- compound ring ferromagnet (anchors 11) 12,

- ring ferrite (compound ring ferromagnet 12) 13.

- ring ferrite (composite ring ferromagnet 12) 14.

Inductor (magnetic system 10) 15,

- the core in the form of a glass (inductor 15) 16,

- bottom (core 16) 17.

Inductor (magnetic system 10) 18,

- the core in the form of a glass (inductor 18) 19,

- bottom (core 19) 20.

Insulating gasket (between bottom 17 and bottom 20) 21.

Ferrite ring (magnetic system 10 under the core 16) 22.

Ferrite ring (magnetic system 10 above the core 19) 23,

- an intermediate gasket (on a ferrite ring 23) 24.

Threaded sleeve (in case 3) 25,

- clamp (on the threaded sleeve 25) 26,

- shielded cable (for clamp 26) 27,

- screen braid (shielded cable 27) 28.

Flange (between threaded sleeve 25 and clamp 26) 29.

The electrical connection device in the form of a connecting printed circuit board (in the threaded sleeve 25) 30,

- elastic gasket (for connecting printed circuit board 30) 31.

Closing spring 32.

The inductive transducer contains a composite housing 1, a guiding device b with a measuring rod 7, a magnetic system 10 and an electrical connection device 30.

The composite body 1 is made of two body parts 2 and 3 and contains the body part of the guide device 2 and the body part of the magnetic system 3. In the body parts 2 and 3 there are grooves 4. The body part of the guide device 2 and the body part of the magnetic system 3 are mounted coaxially and rigidly bonded to each other by means of, for example, epoxy connectors 5 located in the grooves 4, or, for example, by means of a tight fit (not considered).

In the housing of the guide device 2, a guide device 6 with a measuring rod 7 is placed. The measuring rod 7 is equipped with a measuring tip 8 and is interfaced with a closing spring 32. The closing spring 32

provides clamping of the measuring tip 8 to the measured part. Between the housing part of the guide device 2 of the composite housing 1 and the measuring rod 7 is placed an elastic protective sleeve 9, which protects the guide device 6 from contamination.

A magnetic system 10 is located in the housing of the magnetic system 3. The magnetic system 10 comprises an armature 11, inductors 15 and 18, and two ferrite rings 22 and 23.

The anchor 11 is made with a composite annular ferromagnet 12. The composite annular ferromagnet 12 contains at least two annular ferrites 13 and 14, the Anchor 11 is mounted on the measuring rod 7 coaxially with it.

Inductors 15 and 18 are placed in the cores in the form of cups 16 and 19 with bottoms 17 and 20, respectively, facing each other and equipped with a common insulating gasket 21. To ensure high accuracy of the converter, the inductors 15 and 18 have differential switching (not shown) , while the coils 15 and 18 with a recording device are connected to a bridge circuit (not shown). In the cores 16 and 19 there are holes for the output wires of the coils (not shown).

In the magnetic system 10, ferrite rings 22 and 23 are coaxially mounted with the cores 16 and 19. They are placed on the outer end sides of each of the cores 16 and 19. A ferrite ring 22 is installed under the core 16. A ferrite ring 23 is installed above the core 19. The diametric dimensions of the ferrite rings 22 and 23 are equal to the diametrical dimensions of the cores 16 and 19. Axial dimensions

ferrite rings 22 and 23 are equal to the axial dimensions of the inductors 15 and 18.

On the ferrite ring 23, located on the side of the output cable 27, for fixing the cores 16 and 19 and ferrite rings 22 and 23 in the body of the magnetic system 3 in the axial direction there is an intermediate gasket 24. The intermediate gasket 24 is pressed by a threaded sleeve 25 installed in the housing magnetic system 3. A clamp 26 with a shielded cable 27, a shield braid 28, which is connected to a flange 29, placed coaxially shielded cable 27, between the clamp 26 and the threaded sleeve 25 having contact with the composite housing 1. In the threaded sleeve 25 there is a device for electrically connecting the inductive coils 15 and 18 in the form of a connecting printed circuit board 30. The connecting printed circuit board 30 is facing the ferrite ring 23 and, respectively, to the inductors 15 and 18. The connecting printed circuit board 30 is fixed in the threaded sleeve 25 with an elastic gasket 31, for example, of rubber.

The inductive transducer performs measurements as follows.

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

When the position of the measuring rod 7 with the armature 11 changes, the balance of the AC bridge composed of the windings of the inductors 15 and 18 changes and voltage drops appear at the output of the inductive converter, which is displayed on a recording device (not shown), where

it is processed and the result of the measurement of displacements is produced.

Providing the converter with two ferrite rings 22 and 23 located on different sides of the inductors 15 and 18, and performing them with axial dimensions equal to the axial dimensions of the inductors 15 and 18, increases the measurement range with high sensitivity of the converter and small axial dimensions.

Placing the ferrite rings 22 and 23 coaxially with the inductors 15 and 18 creates a single base for installing the cores 16 and 19 and the ferrite rings 22 and 23, making the ferrite rings 22 and 23 with diameters equal to the diametrical sizes of the cores 16 and 19 and making the ring ferromagnet 12 anchors 11 composite - simplifies the manufacture and assembly of the converter.

The execution of the housing 1 component of the housing of the guide device 2 and the housing of the magnetic system 3 with subsequent coaxial installation ensures the separate manufacture of housing parts 2 and 3 - simplifies assembly, improves control operations with the magnetic system 10 (inductor 15 and 18, ferrite rings 22 and 23) and improves the verification of the operation of the guide device 6 with the measuring rod 7.

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, a magnetic system with inductors located in the cores, and an armature including an annular ferromagnet rigidly connected to the measuring rod, and a device for electrically connecting inductive coils with an output shielded cable, characterized in that that the body is made up of two body parts mounted coaxially and rigidly fastened together, containing the body of the guide The properties and the body of the magnetic system with an additional two ferrite rings placed in it coaxially with the cores placed on the outer end sides of each of the cores having diameters equal to the corresponding sizes of the cores, and axial sizes equal to the corresponding axial sizes of the inductors, annular the armature ferromagnet is made of at least two ring ferrites, and the body of the magnetic system is made with a threaded sleeve in which the arm the triple electrical connection of inductive coils in the form of a connecting printed circuit board facing the ferrite ring and, accordingly, to the inductors.