CN219265345U - Incremental inductive linear grid ruler - Google Patents

Abstract

The application discloses an incremental inductive linear grating ruler, which comprises a grating ruler body and a reading plate which is opposite to the grating ruler body and moves relatively, wherein the grating ruler body is provided with an incremental code channel, a detection part for reading displacement information of the incremental code channel is arranged in the reading plate, the grating ruler body is provided with a zero part, the zero part is positioned in a movement track of the grating ruler body and the reading plate which move relatively, the reading plate is internally provided with a zero-position sensing unit, when the grid ruler body and the reading plate relatively move, the sensing signal output by the zero-position sensing unit can change when the zero-position sensing unit passes through a zero-position component, and the signal processing unit in the reading plate detects the changing sensing signal and determines the position of the zero-position component as a zero position through signal processing. The method has the effects of reducing failure risk, material cost and debugging cost.

Description

Incremental inductive linear grid ruler

Technical Field

The application relates to the field of encoders, in particular to an incremental inductive linear grating ruler.

Background

In order to measure physical quantities such as the position and speed of a moving body that moves linearly, a linear encoder is generally used. The current linear encoder mainly adopts a photoelectric type and a magnetoelectric type, and the photoelectric type encoder is easily influenced by environmental pollution, so that the detection is interfered, and the reliability and the precision are influenced; the magneto-electric encoder is susceptible to distortion of code channels caused by interference of external magnetic fields, so that resolution and precision are relatively low, and accordingly, in order to solve the problems, an inductive encoder is provided.

The utility model provides an inductance type increment formula high accuracy encoder of rotor wireless cable that chinese patent publication No. CN215810903U disclosed, includes reading board and rotor, the rotor is located the top of reading board and the reading board is used for reading the displacement information of rotor with being detected moving part fixed connection, the reading board includes a plurality of array arrangement's detection component, each detection component all includes exciting coil and receiving coil, and the encoder is at the during operation, is the biggest detection component feedback displacement information of rotor coverage area all the time, can not receive environmental pollution and magnetic field interference from this, can accomplish displacement information output in whole range.

With respect to the related art in the above, the inventors consider that there are the following drawbacks: since the encoder is incremental, the reference zero position needs to be found when the encoder is started or reset, so that in practical application, a proximity switch is usually installed to serve as the origin position of the encoder, which results in adding additional devices and easily increasing the failure risk.

Disclosure of Invention

In order to reduce failure risk, the application provides an incremental inductive linear grid ruler.

The application provides an increment formula inductance formula straight line bars chi adopts following technical scheme:

the utility model provides an increment formula inductance type straight line bars chi, includes bars chi body, just and the reading board of relative motion with bars chi body, bars chi body is provided with increment sign indicating number way, be provided with the detection component that is used for reading increment sign indicating number way displacement information in the reading board, bars chi body is provided with zero component, zero component is located the motion trail of bars chi body and reading board relative motion, be provided with zero induction unit in the reading board, when bars chi body and reading board relative motion, when making zero induction unit pass through zero component, the induction signal of zero induction unit output can change, the signal processing unit in the reading board detects the induction signal of change to confirm the position of zero component as the zero through signal processing.

Through adopting above-mentioned technical scheme, the induction signal of zero position induction element output can change when zero position part is passed through to the zero position induction element, and signal processing unit confirms the zero position of grid chi body through detecting whether the induction signal of zero position induction element changes to need not to set up the proximity switch in addition and confirm the zero position, reduced material cost and debugging cost, reduced the inefficacy risk simultaneously.

Optionally, the zero part is a zero metal block, the zero induction unit is a zero coil, when the grid ruler body and the reading plate relatively move, the zero metal block can shield the zero coil to change inductance signals of the zero coil, and the signal processing unit in the reading plate detects the changed inductance signals and determines the position of the zero metal block as a zero through signal processing.

Through adopting above-mentioned technical scheme, lets in high frequency alternating current in the zero coil, when bars chi body and reading board relative motion, makes zero coil when passing through the zero metal piece, zero metal piece can shelter from zero coil, because the vortex effect, the magnetic field weakens to make zero coil's inductance signal change, and then signal processing unit in the reading board detects inductance signal and changes and after signal processing, thereby judge zero metal piece place position as the zero.

Optionally, the grid chi body is located one side that the increment was said and is provided with zero position sign indicating number and says, the zero position metal piece is located zero position sign indicating number and says, just the zero position coil sets up in one side of detecting element and corresponds with zero position sign indicating number and says.

By adopting the technical scheme, the zero-position metal block can be arranged at any position of the zero-position code channel according to the use requirement, so that the zero position setting has flexibility.

Optionally, the zero-position metal block is filled into any notch of the incremental code channel, and the zero-position coil is arranged along the length direction of the detection component and close to the position of one end part of the detection component.

By adopting the technical scheme, the zero-position metal blocks are filled into any notch of the incremental code channels, so that the incremental code channels form complete metal surfaces in small areas, zero position setting can be realized by a single code channel mode, the occupied space of the grid ruler body is reduced, and the linear grid ruler is miniaturized.

Optionally, the both ends of zero position sign indicating number way are provided with first spacing metal piece respectively, the zero position metal piece is located between two first spacing metal pieces, the metal material of first spacing metal piece and zero position metal piece is different or shelter from the area difference of zero position coil, when grid chi body and reading board relative motion, signal processing unit in the reading board distinguishes the inductance signal variation volume that produces when zero position coil passes through first spacing metal piece and zero position metal piece respectively in order to confirm the spacing of zero position or both ends of grid chi body.

Through adopting above-mentioned technical scheme, in order to carry out spacingly to the travel of reading plate to set up first spacing metal piece respectively at the both ends of zero position sign indicating number way, because the metal material of first spacing metal piece and zero position metal piece is different, thereby the inductance signal variation that produces when making zero position coil pass through first spacing metal piece and zero position metal piece respectively is different, and then can distinguish and confirm the zero position or spacing.

Optionally, the both ends of increment sign indicating number way are provided with respectively first spacing metal piece, the zero position metal piece is located between two first spacing metal pieces, the metal material of first spacing metal piece and zero position metal piece is different or shelter from the area difference of zero position coil, when bars chi body and reading board relative motion, signal processing unit in the reading board distinguishes the inductance signal variation volume that produces when passing through first spacing metal piece and zero position metal piece respectively in order to confirm the spacing of the zero position of bars chi body or both ends.

Optionally, the reading board is provided with spacing coil in one side of zero coil, and when grid chi body and reading board relative motion, signal processing unit in the reading board distinguishes in order to confirm the spacing of grid chi body's zero bit or both ends according to the inductance signal variation who produces respectively when spacing coil and zero coil pass through first spacing metal piece and zero metal piece respectively.

Optionally, the both ends of zero position code way are provided with the spacing metal block of second respectively, the spacing metal block of zero position is located between two spacing metal blocks of second, the reading board is located one side of zero position coil and is provided with spacing coil, spacing coil and zero position coil can be sheltered from simultaneously to the spacing metal block of second, signal processing unit in the reading board is according to judging spacing coil and zero position coil and whether the respective inductance signal changes in order to confirm the spacing of zero position or both ends of grid chi body when passing through the spacing metal block of second respectively and zero position metal block simultaneously.

Through adopting above-mentioned technical scheme, through setting up the spacing metal piece of second to the size relation between spacing metal piece of second and spacing coil and the zero coil is adjusted, makes spacing coil and zero coil only when passing through the spacing metal piece of second, and its respective inductance signal just can change simultaneously, thereby confirms that the reading board removes the spacing position to the bars chi body this moment.

Optionally, the both ends of increment sign indicating number way are provided with respectively the spacing metal block of second, the zero position metal block is located between two spacing metal blocks of second, the reading board is located one side of zero position coil and is provided with spacing coil, spacing coil and zero position coil can be sheltered from simultaneously to the spacing metal block of second, signal processing unit in the reading board is according to judging spacing coil and zero position coil and respectively when passing through spacing metal block of second and zero position metal respectively whether the respective inductance signal changes in order to confirm the spacing of zero position or both ends of grid chi body simultaneously.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the zero position induction unit passes through the zero position part, the induction signal output by the zero position induction unit can change, and the signal processing unit determines the zero position of the grid ruler body by detecting whether the induction signal of the zero position induction unit changes or not, so that a proximity switch is not required to be additionally arranged to determine the zero position, the material cost and the debugging cost are reduced, and meanwhile, the failure risk is reduced. .

2. In order to limit the moving stroke of the reading plate, first limiting metal blocks are respectively arranged at two ends of the zero-position code channel, and the zero-position coils are different in inductance signal variation quantity generated when passing through the first limiting metal blocks and the zero-position metal blocks respectively due to the fact that the first limiting metal blocks and the zero-position metal blocks are different in metal materials, so that zero positions or limiting positions can be distinguished and determined.

Drawings

Fig. 1 is a schematic overall structure of a first embodiment of the present application.

Fig. 2 is a schematic structural diagram of a grid ruler body and a reading plate in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a grid ruler body and a reading plate in a second embodiment of the present application.

Fig. 4 is a schematic structural diagram of a grid ruler body and a reading plate in a third embodiment of the present application.

Fig. 5 is a schematic structural view of another embodiment of the grating ruler body and the reading plate in the third embodiment of the present application.

Fig. 6 is a schematic structural diagram of a grid ruler body and a reading plate in a fourth embodiment of the present application.

Fig. 7 is a schematic structural diagram of a grid ruler body and a reading plate in a fifth embodiment of the present application.

Fig. 8 is a schematic structural diagram of another implementation of the grid ruler body and the reading plate in the fifth embodiment of the present application.

Fig. 9 is a schematic structural diagram of a grid ruler body and a reading plate in a sixth embodiment of the present application.

Reference numerals illustrate:

1. a grid ruler body; 2. a reading plate; 3. incremental code channels; 4. a detection section; 5. zero bit code channel; 6. zero-position metal blocks; 7. zero coil; 41. an exciting coil; 42. a receiving coil; 8. a first limit metal block; 9. a limit coil; 10. and the second limiting metal block.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-9.

The embodiment of the application discloses an incremental inductive linear grid ruler.

Embodiment one:

referring to fig. 1 and 2, an incremental inductive linear grating ruler comprises a grating ruler body 1 and a reading plate 2 which is opposite to the grating ruler body 1 and moves relatively in parallel, wherein an incremental code channel 3 is arranged on the grating ruler body 1 along the length direction of the grating ruler body, and a detection part 4 for reading displacement information of the incremental code channel 3 is arranged in the reading plate 2. The grid ruler body 1 is provided with zero parts, one side of the grid ruler body 1, which is positioned on the increment code channel 3, is provided with a zero code channel 5, the zero code channel 5 is parallel to the increment code channel 3, and the zero parts are positioned in the zero code channel 5. The reading plate 2 is internally provided with a zero-position sensing unit which is arranged on one side of the detection part 4 and corresponds to the zero-position code channel 5.

Referring to fig. 2, the zero part is a zero metal block 6, the zero induction unit is a zero coil 7, the zero coil 7 is connected with the signal processing unit, and high-frequency alternating current is introduced into the zero coil 7 to generate an alternating electromagnetic field, so that when the grid ruler body 1 and the reading plate 2 relatively move, the zero coil 7 can shield the zero coil 7 when passing through the zero metal block 6, eddy current effect is generated on the surface of the zero metal block 6 to weaken the magnetic field, thereby changing the inductance signal of the zero coil 7, after the signal processing unit in the reading plate 2 detects that the inductance signal is changed, the signal processing unit is compared with a preset threshold value, and when the inductance signal of the zero coil 7 reaches the threshold value, a Z pulse signal is formed through the single chip microcomputer trigger circuit, so that the position of the zero metal block 6 is judged as the zero position.

Referring to fig. 2, the detecting unit 4 includes an exciting coil 41 and a receiving coil 42, where the exciting coil 41 and the receiving coil 42 are respectively connected with a signal processing unit in the reading board 2, and when the reading board 2 and the grid ruler body 1 move relatively, the exciting coil 41 emits a high-frequency exciting signal, and generates an alternating electromagnetic field in space, so that eddy current effects generated by grooving of the incremental code channel 3 are different, and the receiving coil 42 can receive electric signals with different phases, so that the signal processing unit obtains the displacement of the reading board 2 relative to the grid ruler body 1 after resolving the electric signals.

Embodiment two:

the present embodiment differs from the first embodiment in that: referring to fig. 3, the zero-position metal block 6 is filled into any notch of the incremental code channel 3, so that the incremental code channel 3 forms a complete metal surface of a small area, and meanwhile, the zero-position coil 7 is arranged along the length direction of the detection component 4 and close to the end part of the detection component 4, so that an inductance signal of the zero-position coil 7 can be changed when the zero-position coil 7 passes through the zero-position metal block, and therefore, a Z signal can be output by arranging a single code channel, the occupied space of the direct-wire grid ruler is reduced, equipment is miniaturized, and the direct-wire grid ruler is more beneficial to being installed in places with limited space.

Embodiment III:

the present embodiment differs from the first embodiment in that: referring to fig. 4, two ends of the zero code channel 5 are respectively provided with a first limiting metal block 8 for limiting, the zero metal block 6 is located between the two first limiting metal blocks 8, and the first limiting metal blocks 8 and the zero metal block 6 are different in metal material or different in area of shielding the zero coil 7, so that inductance signal variation generated when the zero coil 7 passes through the first limiting metal blocks 8 and the zero metal block 6 respectively is different, when the grid ruler body 1 and the reading plate 2 relatively move, a signal processing unit in the reading plate 2 performs a difference ratio pair on inductance signal variation generated when the zero coil 7 passes through the first limiting metal blocks 8 and the zero metal block 6 respectively, and therefore whether the passing position is the zero position of the grid ruler body 1 or the limitation of the two ends of the grid ruler body 1 is distinguished, and the moving stroke of the reading plate 2 is further limited.

Referring to fig. 5, in other embodiments, a limit coil 9 may be disposed on one side of the reading plate 2 located on the zero coil 7, and when the grid ruler body 1 and the reading plate 2 move relatively, the signal processing unit in the reading plate 2 may compare and determine the passing position according to the inductance signal variation generated when the limit coil 9 and the zero coil 7 pass through the first limit metal block 8 and the zero metal block 6 respectively, so as to determine whether the passing position is the zero position of the grid ruler body 1 or the limit of the two ends of the grid ruler body 1.

Embodiment four:

the present embodiment differs from the first embodiment in that: referring to fig. 6, two ends of the zero-bit code channel 5 are respectively provided with a second limiting metal block 10, and the zero-bit metal block 6 is located between the two second limiting metal blocks 10. The reading plate 2 is provided with the above-mentioned spacing coil 9 in one side of zero coil 7, through the size relation between adjustment second spacing metal piece 10 and zero coil 7 and spacing coil 9, when making zero coil 7 and spacing coil 9 pass through second spacing metal piece 10, second spacing metal piece 10 can shelter from zero coil 7 and spacing coil 9 simultaneously, thereby make zero coil 7 and spacing coil 9's inductance signal can change simultaneously, and when zero coil 7 and spacing coil 9 pass through zero metal piece 6, zero metal piece 6 shelters from zero coil 7 or spacing coil 9 alone, thereby signal processing unit in reading plate 2 is through according to spacing coil 9 and the respective inductance signal of zero coil 7 whether change simultaneously, in order to judge that the current position of reading plate 2 is the zero position of grid chi body 1 or the spacing of grid chi body 1 both ends.

Fifth embodiment:

the difference between this embodiment and the second embodiment is that: referring to fig. 7, the two ends of the incremental track 3 are respectively provided with the first limiting metal blocks 8, the zero-position metal block 6 is located between the two first limiting metal blocks 8, and the metal materials of the first limiting metal blocks 8 and the zero-position metal block 6 are different or the areas of the zero-position coils 7 blocked by the first limiting metal blocks and the zero-position metal blocks are different. When the grid ruler body 1 and the reading plate 2 relatively move, the signal processing unit in the reading plate 2 recognizes and distinguishes the inductance signal variation generated when the zero coil 7 passes through the first limit metal block 8 and the zero metal block 6 respectively, so that zero position or limit of the grid ruler body 1 is judged.

Referring to fig. 8, in the same way, in other embodiments, the above-mentioned limit coil 9 may be disposed on the side of the reading plate 2 located on the zero-position coil 7, and the signal processing unit in the reading plate 2 may distinguish the zero position or limit of the grid ruler body 1 according to the inductance signal variation generated when the limit coil 9 and the zero-position coil 7 pass through the first limit metal block 8 and the zero-position metal block 6 respectively.

Example six:

the difference between this embodiment and the second embodiment is that: referring to fig. 9, the two ends of the incremental track 3 are respectively provided with the second limiting metal blocks 10, the zero-position metal block 6 is located between the two second limiting metal blocks 10, and the side of the reading plate 2 located at the zero-position coil 7 is provided with the limiting coil 9. Through adjusting the size relation between the second spacing metal block 10 and the zero coil 7 and the spacing coil 9, when the zero coil 7 and the spacing coil 9 pass through the second spacing metal block 10, the second spacing metal block 10 can simultaneously shield the zero coil 7 and the spacing coil 9, thereby the inductance signals of the zero coil 7 and the spacing coil 9 can change simultaneously, and when the zero coil 7 and the spacing coil 9 pass through the zero coil 6, the zero coil 7 or the spacing coil 9 is only shielded by the zero coil 6 alone, thereby the signal processing unit in the reading plate 2 is used for judging whether the current position of the reading plate 2 is the zero position of the grating ruler body 1 or the spacing of the two ends of the grating ruler body 1 through the simultaneous change of the respective inductance signals of the spacing coil 9 and the zero coil 7.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (9)

1. An incremental inductive linear grating ruler comprises a grating ruler body (1) and a reading plate (2) which is opposite to the grating ruler body (1) and moves relatively, the utility model discloses a grating chi body (1) is provided with increment code way (3), be provided with in reading board (2) and be used for reading increment code way (3) displacement information's detection component (4), its characterized in that: the grid ruler is characterized in that a zero part is arranged on the grid ruler body (1), the zero part is located in a motion track of relative motion between the grid ruler body (1) and the reading plate (2), a zero sensing unit is arranged in the reading plate (2), when the grid ruler body (1) and the reading plate (2) move relatively, when the zero sensing unit passes through the zero part, a sensing signal output by the zero sensing unit can change, a signal processing unit in the reading plate (2) detects the changing sensing signal, and the position of the zero part is determined to be a zero position through signal processing.

2. The incremental inductive linear grid ruler of claim 1, wherein: the zero part is a zero metal block (6), the zero induction unit is a zero coil (7), when the grid ruler body (1) and the reading plate (2) move relatively, the zero metal block (6) can shield the zero coil (7) to enable inductance signals of the zero coil (7) to change, and the signal processing unit in the reading plate (2) detects the changing inductance signals and determines the position of the zero metal block (6) as a zero through signal processing.

3. An incremental inductive linear grid ruler according to claim 2, characterized in that: the grid ruler is characterized in that a zero-bit code channel (5) is arranged on one side of the incremental code channel (3) of the grid ruler body (1), a zero-bit metal block (6) is arranged in the zero-bit code channel (5), and a zero-bit coil (7) is arranged on one side of the detection component (4) and corresponds to the zero-bit code channel (5).

4. An incremental inductive linear grid ruler according to claim 2, characterized in that: the zero-position metal block (6) is filled into any notch of the incremental code channel (3), and the zero-position coil (7) is arranged along the length direction of the detection component (4) and close to the position of one end part of the detection component (4).

5. An incremental inductive linear grid ruler according to claim 3, wherein: the utility model discloses a grid ruler, including grid ruler body (1), reading board (2), zero position code way (5), zero position code way, signal processing unit, first spacing metal piece (8) are provided with respectively at both ends of zero position code way (5), zero position metal piece (6) are located between two first spacing metal pieces (8), the metal material of first spacing metal piece (8) and zero position metal piece (6) is different or shelter from the area difference of zero position coil (7), and when grid ruler body (1) and reading board (2) relative motion, signal processing unit in reading board (2) distinguishes zero position coil (7) through the inductance signal variation who produces when first spacing metal piece (8) and zero position metal piece (6) respectively in order to confirm the spacing at zero position or both ends of grid ruler body (1).

6. The incremental inductive linear scale of claim 4, wherein: the two ends of the incremental code channel (3) are respectively provided with a first limiting metal block (8), the zero-position metal block (6) is positioned between the two first limiting metal blocks (8), the first limiting metal blocks (8) are different from the metal materials of the zero-position metal block (6) or the areas of the zero-position coils (7) are shielded, when the grid ruler body (1) and the reading plate (2) move relatively, the signal processing units in the reading plate (2) distinguish the zero-position coils (7) respectively through the inductance signal variation generated when the first limiting metal blocks (8) and the zero-position metal block (6) so as to determine the zero position of the grid ruler body (1) or the limit of the two ends.

7. An incremental inductive linear grid ruler according to claim 5 or 6, characterized in that: the reading plate (2) is provided with spacing coil (9) in one side of zero position coil (7), and when grid chi body (1) and reading plate (2) relative motion, signal processing unit in reading plate (2) distinguishes in order to confirm the spacing at zero position or both ends of grid chi body (1) according to spacing coil (9) and the inductance signal variation who produces when zero position coil (7) respectively pass through first spacing metal piece (8) and zero position metal piece (6).

8. An incremental inductive linear grid ruler according to claim 3, wherein: the two ends of the zero-position code channel (5) are respectively provided with a second limiting metal block (10), the zero-position metal blocks (6) are located between the two second limiting metal blocks (10), one side of the reading plate (2) located on the zero-position coil (7) is provided with a limiting coil (9), the second limiting metal blocks (10) can simultaneously shield the limiting coil (9) and the zero-position coil (7), and a signal processing unit in the reading plate (2) is used for determining whether respective inductance signals change simultaneously to determine zero position or limiting at two ends of the grating ruler body (1) according to the fact that the limiting coil (9) and the zero-position coil (7) respectively pass through the second limiting metal blocks (10) and the zero-position metal blocks (6).

9. The incremental inductive linear scale of claim 4, wherein: the two ends of the increment code channel (3) are respectively provided with a second limiting metal block (10), the zero-position metal blocks (6) are located between the two second limiting metal blocks (10), one side of the reading plate (2) located on the zero-position coil (7) is provided with a limiting coil (9), the second limiting metal blocks (10) can simultaneously shield the limiting coil (9) and the zero-position coil (7), and a signal processing unit in the reading plate (2) is used for determining whether respective inductance signals change simultaneously or not when the limiting coil (9) and the zero-position coil (7) pass through the second limiting metal blocks (10) and the zero-position metal respectively so as to determine the zero position of the grid ruler body (1) or the limiting positions at two ends.

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