CN214702296U

CN214702296U - Induction type encoder

Info

Publication number: CN214702296U
Application number: CN202121328794.6U
Authority: CN
Inventors: 王乃琼
Original assignee: Taizhou Bailijian Electronic Technology Co ltd
Current assignee: Taizhou Bailijian Electronic Technology Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-11-12
Anticipated expiration: 2031-06-15

Abstract

The utility model provides an induction type encoder, encoder technical field. It has solved the problem that detects the precision low, the installation is inconvenient. The induction type encoder comprises a circular disc, a magnetic ring arranged at the outer ring of the disc and an induction head matched with the magnetic ring, wherein the induction head comprises a shell and an induction element fixed in the shell, the shell is provided with an arc base plane concentrically arranged with the outer peripheral surface of the disc and two side planes parallel to the two side walls of the disc, the arc base plane is positioned between the two side planes, the two side planes are all protruded out of the arc base plane to form extension parts, and the distance between the two extension parts is matched with the thickness of the disc. This induction type encoder forms the extension through both sides face protrusion outside the circular arc base surface for the outer lane of disc has the part card to two between the extension, can play dustproof effect like this, avoids card such as some great iron fillings or impurity to have improved the detection precision in the clearance between circular arc base surface and the disc outer lane.

Description

Induction type encoder

Technical Field

The utility model belongs to the technical field of the encoder, a induction type encoder is related to.

Background

An encoder is a device that compiles and converts test signals or data into a form of signals that can be communicated, transmitted, and stored. The encoder is divided into a photoelectric type, a magnetoelectric type and a contact brush type according to the working principle, wherein the magnetoelectric encoder is widely applied to complex environments which cannot be suitable for various other encoders due to the advantages of simple structure, strong anti-interference, high response speed and the like. The conventional magnetoelectric encoder basically comprises a reading head, a magnetic ring and a disk, wherein the magnetic ring is arranged at the outer ring of the disk, for example, the magnetic ring is applied to a machine tool, the disk is fixed on a main shaft of the machine tool, and the reading head is fixed on a certain base of the machine tool and is positioned at the outer ring of the disk, so that when the main shaft of the machine tool drives the disk to rotate, the reading head can sense equally distributed strong magnetic points on the magnetic ring and transmit signals to a power source, and the action of the power source is controlled.

In the actual installation process, the position between the reading head and the magnetic ring is difficult to control, so that the detection precision is unstable. Therefore, a mounting and positioning structure of a reading head of a magnetic encoder with the patent application number of 201320486199.4 is provided, the reading head is fixedly connected with a reading head base body through a screw, a main shaft is fixedly connected with a magnetic ring, a positioning base surface of the reading head is in an arc shape concentric with the magnetic ring, a flexible positioning plate with fixed thickness and adhesive on one surface is pasted along the circumferential direction of the magnetic ring, when the mounting and positioning structure is used, the magnetic ring is rotated and the reading head is adjusted, so that the positioning base surface of the reading head is tightly attached to the flexible positioning plate, the reading head is fastened immediately, and finally the flexible positioning plate is rotated and torn off. The magnetic encoder reading head can ensure the position relation of the magnetic encoder reading head and the magnetic ring, thereby improving the control precision of the magnetic encoder.

A gap inevitably exists between the positioning base surface of the reading head and the magnetic ring, and dust or other impurities are easy to be clamped in the gap between the positioning base surface and the magnetic ring in the actual use process, so that the detection precision is influenced. Moreover, the flexible positioning plate is easy to remain on the magnetic ring when torn off, and the detection precision is also affected.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide an induction type encoder, solved and detected the problem that the precision is low, the installation is inconvenient.

The purpose of the utility model can be realized by the following technical proposal:

inductive encoder, including the annular disc of circle, locate the disc outer lane the magnetic ring of department and with magnetic ring matched with inductive head, the inductive head include the shell and be fixed in the response component in the shell, have the circular arc base plane and two sides that parallel with disc both sides wall with the concentric setting of disc outer peripheral face on the shell, the circular arc base plane is located between two sides, its characterized in that, two sides all bulge outside the circular arc base plane and form the extension, distance between two extensions cooperatees with the thickness of disc.

When the disc type magnetic induction machine tool is used, the disc is fixed on a main shaft of the machine tool, the induction head is fixed on a base of the machine tool and arranged on the outer peripheral surface of the disc, when the main shaft of the machine tool drives the disc to rotate, the induction head can induce strong magnetic points which are distributed on a magnetic ring in an equal part, and therefore the induction head transmits signals to a power source, and the action of the power source is controlled. The arc base surface and the outer peripheral surface of the disc are concentrically arranged, so that the induction head and the disc can be better matched, and the detection precision is ensured. Because two sides all protrude in the circular arc basal plane and form the extension and the distance between two extensions cooperatees with the thickness of disc for the outer lane of disc has the part card to two between the extension, can play dustproof effect like this, avoids card in the clearance between circular arc basal plane and disc outer lane such as some great iron fillings or impurity, has improved detection accuracy. Moreover, the two extending parts are arranged, so that the installation is more convenient, the position relation between the induction element and the magnetic ring can be ensured only by clamping the outer ring of the disc between the two extending parts, and no additional correction is needed.

In the above-mentioned inductive encoder, the two extending portions extend out of the two ends of the arc-shaped base surface.

The extension part extends out of two ends of the arc base surface, so that the coverage area of the extension part is larger, and the dustproof effect is improved to ensure the detection precision.

In foretell induction type encoder, the shell include through screw fixed casing one and casing two mutually, the circular arc base surface locate on the casing two and two sides walls for casing two, be equipped with mounting hole two in the casing two and the hole of stepping down, the hole of stepping down is linked together and the hole of stepping down runs through the circular arc base surface with the one end drill way of mounting hole two, be equipped with in the casing one with mounting hole two just right mounting hole one, the aperture of the hole of stepping down is greater than the head that mounting hole two and screw and is located the hole of stepping down.

Through the arrangement of the abdicating hole, the head of the screw does not protrude out of the arc base surface, so that the arc base surface and the outer ring of the disc can be close to each other as much as possible, and the induction element is close to the magnetic ring as much as possible to ensure the detection precision. In addition, the coverage area of the extension part is larger, and the dustproof effect is improved.

In the above-mentioned inductive encoder, the outer circumferential surface of the disc is provided with an annular groove, the magnetic ring is arranged in the annular groove, and the outer circumferential surface of the magnetic ring is flush with the outer circumferential surface of the disc.

The peripheral surface of the magnetic ring is flush with the peripheral surface of the disc, so that the coverage area of the extension part is larger, and the dustproof effect is improved.

Compared with the prior art, this induction type encoder forms the extension in circular arc base surface appearance through both sides face protrusion for the outer lane of disc has the part to block to between two extensions, can play dustproof effect like this, avoids card such as some great iron fillings or impurity to have improved the detection precision in the clearance between circular arc base surface and the disc outer lane. Moreover, the installation is more convenient, the position relation between the induction element and the magnetic ring can be ensured only by clamping the outer ring of the disc between the two extension parts, and additional correction is not needed.

Drawings

FIG. 1 is a schematic diagram of the present inductive encoder.

Fig. 2 is a partial sectional view of the present induction encoder.

FIG. 3 is a schematic view of a read head in the present inductive encoder.

FIG. 4 is a cross-sectional view (cross-sectional direction perpendicular to FIG. 2) of a read head in the present inductive encoder.

FIG. 5 is an enlarged cross-sectional view of the read head of FIG. 2.

In the figure, 1, a disc; 2. a magnetic ring; 3. a reading head; 4. a housing; 4a, a first shell; 4a1, mounting hole one; 4a2, connecting sheet; 4a3, connecting hole; 4b, a second shell; 4b1, arc base; 4b2, side; 4b21, extension; 4b3 and a second mounting hole; 4b4, relief holes; 5. an inductive element; 6. and (4) screws.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the inductive encoder includes a circular disc 1, a magnetic ring 2 disposed on an outer ring of the disc 1, and a reading head 3 engaged with the magnetic ring 2. The outer peripheral surface of the disc 1 is provided with an annular groove, the magnetic ring 2 is arranged in the annular groove, and the outer peripheral surface of the magnetic ring 2 is flush with the outer peripheral surface of the disc 1. The disc 1 is an aluminum disc, and during production, an annular groove is machined on the outer peripheral surface of the aluminum disc, then a magnetic material is injected into the annular groove, and finally the magnetic material is magnetized to form the magnetic ring 2. The reading head 3 comprises a shell 4 and an induction element 5 fixed in the shell 4, wherein the induction element 5 is a circuit board provided with a magnetic induction chip. The working principle of the induction encoder is the same as that of the prior art, and is not repeated herein, reference may be made to a magnetic ring 2 encoder disclosed in application No. 201720318146.X, a magnetic ring 2 type rotation detection device disclosed in application No. 201420438346.5, and the like, and reference may also be made to the structure of the induction element 5.

As shown in fig. 2 to 5, the housing 4 has an arc-shaped base surface 4b1 concentric with the outer peripheral surface of the disc 1, the sensing portion of the sensing element 5 is disposed toward the arc-shaped base surface 4b1, the housing 4 further has two side surfaces 4b2 parallel to the two side walls of the disc 1, and the arc-shaped base surface 4b1 is located between the two side surfaces 4b 2. The two side surfaces 4b2 protrude from the circular arc base surface 4b1 to form an extension part 4b21, and the distance between the two extension parts 4b21 is matched with the thickness of the disc 1. In the present embodiment, the two extending portions 4b21 extend out of both ends of the circular arc base surface 4b 1.

Further, as shown in fig. 4 and 5, the housing 4 includes a first housing 4a and a second housing 4b fixed by screws 6, the circular arc base surface 4b1 is disposed on the second housing 4b, and two side surfaces 4b2 are two side walls of the second housing 4 b. The second casing 4b is internally provided with a second mounting hole 4b3 and a yielding hole 4b4, the yielding hole 4b4 is communicated with an orifice at one end of the second mounting hole 4b3, the yielding hole 4b4 penetrates through the arc-shaped base surface 4b1, and the first casing 4a is internally provided with a first mounting hole 4a1 opposite to the second mounting hole 4b 3. The diameter of the abdicating hole 4b4 is larger than that of the mounting hole two 4b3, and the head of the screw 6 is positioned in the abdicating hole 4b 4. The first shell 4a is provided with a connecting piece 4a2, a connecting hole 4a3 is arranged on the connecting piece 4a2 in a penetrating mode, the connecting piece 4a2 is perpendicular to the plane of the side face 4b2, and the shell 4 can be fixed on the base of a machine tool through the connecting hole 4a3 by utilizing a fastener.

When the reading device is used, the disc 1 is fixed on a main shaft of a machine tool, the reading head 3 is fixed on a base of the machine tool and arranged on the outer peripheral surface of the disc 1, when the main shaft of the machine tool drives the disc 1 to rotate, the reading head 3 can sense a main code channel, and therefore the reading head 3 transmits a signal to a power source, and therefore the action of the power source is controlled. The arc-shaped base surface 4b1 and the outer peripheral surface of the disc 1 are concentrically arranged, so that the reading head 3 and the disc 1 can be better matched, and the detection precision is ensured. Because two side surfaces 4b2 all bulge in circular arc basal plane 4b1 and form extension 4b21 and the distance between two extensions 4b21 cooperatees with disc 1's thickness for disc 1's outer lane has the part card to between two extensions 4b21, can play dustproof effect like this, avoid some great iron fillings or impurity etc. to block in the clearance between circular arc basal plane 4b1 and disc 1 outer lane, improved detection accuracy. Moreover, the two extending parts 4b21 are arranged, so that the installation is more convenient, the position relation between the induction element 5 and the magnetic ring 2 can be ensured only by clamping the outer ring of the disc 1 between the two extending parts 4b21, and no additional calibration is needed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. Inductive encoder, including annular disc (1), locate magnetic ring (2) of disc (1) outer lane department and with magnetic ring (2) matched with inductive head (3), inductive head (3) including shell (4) and be fixed in inductive element (5) in shell (4), have on shell (4) with disc (1) outer peripheral face concentric circular arc basal plane (4b1) and two side (4b2) that are parallel with disc (1) both sides wall, circular arc basal plane (4b1) are located between two side (4b2), its characterized in that, two side (4b2) all bulge in circular arc basal plane (4b1) appearance and form extension (4b21), the distance between two extension (4b21) cooperatees with the thickness of disc (1).

2. The inductive encoder according to claim 1, characterized in that both extensions (4b21) extend beyond both ends of the circular arc base surface (4b 1).

3. The inductive encoder according to claim 2, wherein the housing (4) includes a first housing (4a) and a second housing (4b) fixed by a screw (6), the circular arc base surface (4b1) is disposed on the second housing (4b) and two side surfaces (4b2) are two side walls of the second housing (4b), a second mounting hole (4b3) and a yielding hole (4b4) are disposed in the second housing (4b), the yielding hole (4b4) is communicated with one end hole opening of the second mounting hole (4b3) and the yielding hole (4b4) penetrates through the circular arc base surface (4b1), a first mounting hole (4a1) opposite to the second mounting hole (4b3) is disposed in the first housing (4a), the hole diameter of the yielding hole (4b4) is larger than the second mounting hole (4b3) and the head of the screw (6) is located in the yielding hole (4b 4).

4. The inductive encoder according to claim 1, 2 or 3, characterized in that the outer circumference of the disc (1) is provided with an annular groove, the magnetic ring (2) is arranged in the annular groove, and the outer circumference of the magnetic ring (2) is flush with the outer circumference of the disc (1).