Metal induction type angle measuring module and measuring equipment

Abstract

The invention discloses a metal induction type angle measuring module and measuring device.The metal induction type angle measuring module comprises a mounting disc, a coding disc and a plurality of metal inductors, the coding disc is rotatably arranged around the central axis of the coding disc, the coding disc is provided with a code channel, the code channel is provided with a plurality of sectors in the circumferential direction of the code channel, and the sectors are arranged in the mounting disc; each sector is coded according to a Gray code mode to form a metal sector and a non-metal sector; the plurality of metal sensors are arranged at the mounting disc in a one-to-one correspondence to the code channels, each metal sensor forms an initial electric field quantity and / or an initial magnetic field quantity, and the initial electric field quantity and / or the initial magnetic field quantity are / is changed when the metal sector movably passes through. According to the invention, the metal inductor realizes non-contact detection, and has the advantages of high response speed, high reliability, low possibility of being influenced by external environmental factors, wide application range, simplicity and convenience in installation and high anti-interference capability, so that the use reliability of the whole machine is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of encoders, and in particular to a metal induction angle measurement module and a measuring device. Background Art

[0002] The most common encoder on the market today is the photoelectric encoder. Photoelectric encoders generally use grating disks and photodetectors to measure rotation angles or linear motion. Although photoelectric encoders have many advantages, such as high precision and non-contact measurement, they also have some disadvantages, such as: high cost under high resolution and high precision requirements; high requirements for the working environment, pollutants such as dust, dirt or oil stains will affect the transmission of the light beam, thereby affecting the performance and accuracy of the encoder; strong light sources or electromagnetic interference may affect the working stability of the photoelectric encoder. For example, in an industrial environment, electromagnetic noise may cause signal distortion, etc. Summary of the invention

[0003] The main purpose of the present invention is to provide a metal induction angle measurement module and a measuring device, aiming to solve the problems of high cost and high working environment requirements of traditional photoelectric encoders.

[0004] To achieve the above object, the present invention proposes a metal induction angle measurement module, comprising:

[0005] Installation disk;

[0006] A coding disk is coaxially arranged with the mounting disk and is arranged opposite to the mounting disk. The coding disk is rotatable around its central axis. The coding disk is provided with a code track. The code track is provided with a plurality of sectors along its circumference. Each of the sectors is encoded in a Gray code manner to form a metal sector and a non-metal sector; and,

[0007] A plurality of metal sensors are arranged on the installation disk corresponding to each of the code channels one by one, each of the metal sensors forms an initial electric field quantity and / or an initial magnetic field quantity, and when the metal sector moves through, the initial electric field quantity and / or the initial magnetic field quantity changes.

[0008] Optionally, the mounting disk and the encoding disk are spaced apart in the axial direction.

[0009] Optionally, the encoding disk is provided with a plurality of circles of the code tracks in sequence along its radial direction, and the sectors of each of the code tracks are encoded in a Gray code manner.

[0010] Optionally, the metal sensor comprises:

[0011] A magnetic core member, comprising a first magnetic core segment extending along the disk surface of the mounting disk, and two second magnetic core segments protruding from both ends of the first magnetic core segment toward the encoding disk respectively; and,

[0012] The inductor coils are respectively wound around the two second magnetic core segments, so that when energized, the inductor coils form the initial magnetic field at least on one side of the magnetic core piece close to the encoding disk.

[0013] Optionally, the first magnetic core segment is arranged to extend along the circumferential direction or tangential direction of the mounting disk at the location.

[0014] Optionally, the metal sensor further comprises a mounting seat, the mounting seat is provided with two mounting holes, the two mounting holes are arranged at intervals, the mounting seat is fixedly mounted on the mounting disk, and the first magnetic core segment is limited between the mounting seat and the disk surface of the mounting disk, and the two second magnetic core segments are respectively passed through the two mounting holes.

[0015] Optionally, the inductor coil is spirally wound along the circumferential direction and the protruding direction of the corresponding second magnetic core segment; or,

[0016] The inductor coil is wound on the mounting seat in multiple turns with the corresponding second magnetic core segment as the center.

[0017] Optionally, the metal sensor comprises:

[0018] A patch, fixedly mounted on the mounting plate; and

[0019] The capacitor is arranged on the side of the patch facing the encoding disk, and when energized, the capacitor forms the initial electric field at least on the side close to the encoding disk.

[0020] Optionally, the metal sensors are arranged in sequence along the same radial direction of the mounting plate; or,

[0021] The metal sensors are arranged in a staggered manner in sequence along the circumference of the mounting plate;

[0022] Wherein, each of the sectors is suitable for encoding according to the arrangement of each of the metal sensors.

[0023] In addition, to achieve the above-mentioned purpose, the present invention also provides a measuring device, including the metal induction angle measurement module as described above.

[0024] In the technical solution provided by the present invention, each sector is encoded in a Gray code manner to obtain a metal sector and a non-metal sector, which, on the one hand, helps to reduce the error caused by contact switching during the rotation of the encoding disk relative to the mounting disk; on the other hand, the metal sensor can maintain the initial electric field quantity and / or the initial magnetic field quantity unchanged when the non-metal sector moves through, and the initial electric field quantity and / or the initial magnetic field quantity changes when the metal sector moves through, so that the sensing result can be obtained according to the change of the initial electric field quantity and / or the initial magnetic field quantity; compared with the photoelectric sensor device, the metal sensor can also realize non-contact detection, which helps to avoid wear or damage that may be caused by physical contact; the metal sensor has a high response speed and high reliability, is not easily affected by external environmental factors, has a wide range of applications, is easy to install and has strong anti-interference ability, so that the reliability of the whole machine is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A three-dimensional schematic diagram of a first embodiment of a metal induction angle measurement module provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the main structure decomposition of the metal inductive angle measurement module;

[0028] Figure 3 for Figure 1 Schematic diagram of the inductance of the metal sensor when it is not in contact with the metal sector;

[0029] Figure 4 for Figure 1 Schematic diagram of the inductance of the metal sensor when it contacts the metal sector;

[0030] Figure 5 A three-dimensional schematic diagram of a second embodiment of the metal induction angle measurement module provided by the present invention;

[0031] Figure 6 for Figure 5 Schematic diagram of the main structure decomposition of the metal inductive angle measurement module;

[0032] Figure 7 for Figure 5 Schematic diagram of the inductance of the metal sensor when it is not in contact with the metal sector;

[0033] Figure 8 for Figure 5 Schematic diagram of the inductance of the metal sensor when it contacts the metal sector;

[0034] Fig. 9 A three-dimensional schematic diagram of the third embodiment of the metal induction angle measurement module provided by the present invention at the encoder disk;

[0035] Fig.10 A schematic three-dimensional diagram of the fourth embodiment of the metal induction angle measurement module provided by the present invention at the encoder disk.

[0036] Description of Figure Numbers:

[0037] 100 mounting disk; 200 encoding disk; 210 code channel; 211 metal sector; 212 non-metal sector; 220 mounting position projection area; 300 metal sensor; 311 magnetic core component; 311a first magnetic core segment; 311b second magnetic core segment; 312 inductor coil; 313 mounting seat; 321 patch; 322 capacitor component.

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] See also Figures 1 to 10 The present invention provides a metal induction angle measurement module and a measuring device used therein. It is understood that the measuring device can be any device that requires a non-contact, absolute encoder to measure the rotation angle during the operation of its own function.

[0043] Specifically, the metal induction angle measurement module includes a mounting disk 100, an encoding disk 200, and a plurality of metal sensors 300. The encoding disk 200 is coaxial with the mounting disk 100 and arranged opposite to each other. The encoding disk 200 can be rotatably arranged around its own central axis. The encoding disk 200 is provided with a code track 210. The code track 210 is provided with a plurality of sectors along its circumference. Each sector is encoded in a Gray code manner to form a metal sector 211 and a non-metallic sector 212. The plurality of metal sensors 300 are arranged at the mounting disk 100 in correspondence with each code track 210. Each metal sensor 300 forms an initial electric field quantity and / or an initial magnetic field quantity, and when the metal sector 211 moves through, the initial electric field quantity and / or the initial magnetic field quantity changes.

[0044] In the technical solution provided by the present invention, each sector is encoded in a Gray code manner to obtain a metal sector 211 and a non-metal sector 212, which, on the one hand, helps to reduce the error caused by contact switching during the rotation of the encoding disk 200 relative to the mounting disk 100; on the other hand, the metal sensor 300 can maintain the initial electric field quantity and / or the initial magnetic field quantity unchanged when the non-metal sector 212 moves through, and the initial electric field quantity and / or the initial magnetic field quantity changes when the metal sector 211 moves through, so that the sensing result can be obtained according to the change of the initial electric field quantity and / or the initial magnetic field quantity; compared with the metal sensor 300, the metal sensor 300 can also realize non-contact detection, which helps to avoid wear or damage that may be caused by physical contact; the metal sensor 300 has a high response speed and high reliability, is not easily affected by external environmental factors, has a wide range of applications, is easy to install and has strong anti-interference ability, so that the reliability of the whole machine is stronger.

[0045] It can be understood that the mounting disk 100 and the encoding disk 200 are coaxially arranged, and the shapes, sizes, etc. of the two are roughly adapted. The mounting disk 100 is a disk body that is fixed at least in the rotation direction. The encoding disk 200 can rotate around its own central axis. The rotation of the encoding disk 200 can be driven by any suitable method, for example, by a specially arranged rotation drive mechanism that is drivingly connected to the encoding disk 200.

[0046] Since the present application changes the initial electric field and / or initial magnetic field of the metal sensor 300 through the metal sector 211, in a specific application, the mounting disc 100 and the encoding disc 200 can be kept spaced in the axial direction. That is, physical contact between the mounting disc 100 / metal sector 211 and the encoding disc 200 can be avoided, thereby avoiding wear or damage caused by physical contact.

[0047] One or more circles of code tracks 210 may be provided on the encoding disk 200. The multiple circles of code tracks 210, that is, each code track 210 is provided in multiple circles from the center of the encoding disk 200 to the outer periphery of the encoding disk 200. Each code track 210 is in the shape of a concentric ring. In general, the ring widths of the concentric rings corresponding to each code track 210 are substantially the same, so that the shapes and sizes of each sector divided on the same code track 210 are substantially consistent, and the shapes and sizes of each sector divided on different code tracks 210 are substantially kept uniformly varied.

[0048] Each sector on each code channel 210 is encoded in a Gray code manner, and then divided into a plurality of metal sectors 211 and a plurality of non-metal sectors 212. Since the number of turns of the code channel 210 is not limited in this design, the number, arrangement and other specific forms of expression of each metal sector 211 and each non-metal sector 212 obtained by Gray code encoding may be different. However, it can be understood that in order to make the angular resolution as low as possible, the number of turns of the code channel 210 can be set to be relatively large, for example Figures 9 and 10 As shown, when the number of turns of the code channel 210 is set to 4, the maximum resolution of the circumference is 360 / 16=22.5 degrees. When the number of turns of the code channel 210 is set to 8, the maximum resolution of the circumference is 360 / 256=1.4 degrees. Of course, when the number of turns of the code channel 210 is set to 8, only one section can be taken, for example, 180 equal divisions are performed according to the Gray code method, and the angle resolution is 2 degrees.

[0049] Among them, the metal sector 211 is a sector with metal characteristics sufficient to affect the initial electric field and / or initial magnetic field of the metal sensor 300 as the name implies; the non-metal sector 212 is a sector without metal characteristics sufficient to affect the initial electric field and / or initial magnetic field of the metal sensor 300. In specific applications, the code disk 200 may specifically include a transparent disk body and a metal layer disposed on a partial disk surface of the transparent disk body. The disk surface provided with the metal layer constitutes the metal sector 211, and the remaining disk surface constitutes the non-metal sector 212. Among them, the metal layer can be covered on the transparent disk body by any process, such as coating, attachment, etc. Or in one embodiment, the code disk 200 includes a metal disk body, a partial disk surface of the metal disk body is hollowed out, the hollowed disk surface constitutes the non-metal sector 212, and the remaining disk surface constitutes the metal sector 211. At this time, the metal disk body refers to a disk body with the above-mentioned metal characteristics, which can be directly made of metal material as a whole, or it can be made by covering the transparent disk body with a metal layer as described above. The metal sector 211 has sufficient metal properties due to the metal plate, while the non-metal sector 212 is hollow and basically does not have the above metal properties.

[0050] In view of the above, if the installation disk 100 is defined to form an installation position at a position corresponding to each code channel 210, the installation position can be used to install the metal sensor 300. The installation position has an axial installation position projection area 220 on the code disk 200. Then, the area of ​​the installation position projection area 220 is not larger than the area of ​​each sector. The specific settings of the metal sensor 300 are as follows:

[0051] Please combine Figures 1 to 4In one embodiment, the metal inductor 300 includes a magnetic core 311 and an inductor 312. The magnetic core 311 includes a first magnetic core segment 311a extending along the disk surface of the mounting disk 100, and two second magnetic core segments 311b protruding from both ends of the first magnetic core segment 311a toward the encoding disk 200; the inductor 312 is respectively wound around the two second magnetic core segments 311b, so that when powered, the inductor 312 forms an initial magnetic field at least on one side of the magnetic core 311 close to the encoding disk 200. In this way, when the inductor 312 is powered, a sufficient magnetic field can be formed near the free ends of the two second magnetic core segments 311b, and an initial magnetic field is formed. When the non-metallic sector 212 moves through, it will not affect the magnetic field, and the initial magnetic field is maintained substantially unchanged. When the metal sector 211 moves through, it will cause a certain disturbance to the magnetic field, causing the initial magnetic field to change. This change can be converted into an electrical signal in a timely manner, which is convenient for the metal induction angle measurement module, such as a data processing center, to receive, store and analyze it.

[0052] Specifically, the first magnetic core segment 311a is arranged along the circumferential or tangential direction of the mounting disk 100 at the location. That is, the above-mentioned mounting position projection area 220 makes full use of the space of the corresponding sector in the circumferential or tangential direction, but minimizes the excessive occupation of the space of the corresponding sector in the radial direction. In this way, on the limited disk surface of the encoder disk 200, more code tracks 210 can be set according to actual needs.

[0053] Next, the metal sensor 300 also includes a mounting seat 313, which is provided with two mounting holes, which are arranged at intervals. The mounting seat 313 is fixedly mounted on the mounting disk 100, and the first magnetic core segment 311a is limited between the mounting seat 313 and the disk surface of the mounting disk 100, and the two second magnetic core segments 311b are respectively penetrated through the two mounting holes. The mounting holes can indicate the specific installation positions of the two second magnetic core segments 311b, and form circumferential, radial and tangential limits for the magnetic core member 311. The first magnetic core segment 311a is clamped and limited between the mounting seat 313 and the disk surface of the mounting disk 100, which helps to achieve the installation of the magnetic core member 311 when the mounting seat 313 is installed in place on the mounting disk 100. Specifically, a clamping groove can be provided on the disk surface of the mounting disk 100, and the first magnetic core segment 311a is clamped and limited in the clamping groove.

[0054] The winding method of the inductor 312 at the second magnetic core segment 311b is also not limited. Figure 3 to Figure 4 The inductor 312 is spirally wound along the circumferential direction and the protruding direction of the corresponding second magnetic core segment 311b, thereby increasing the winding area between the inductor 312 and the second magnetic core segment 311b; or Figure 2As shown, the inductor 312 is wound on the mounting seat 313 in multiple circles with the corresponding second core segment 311 b as the center, which simplifies the space occupied by the inductor 312 and the second core segment 311 b in the axial direction of the mounting disk 100 and the encoding disk 200.

[0055] In addition, please combine Figures 5 to 8 In another embodiment, the metal sensor 300 includes a patch 321 and a capacitor 322. The patch 321 is fixedly mounted on the mounting disk 100; the capacitor 322 is arranged on the side of the patch 321 facing the encoding disk 200, and when powered, the capacitor 322 forms an initial electric field at least on the side close to the encoding disk 200. In this way, when the capacitor 322 is powered, a sufficient electric field can be formed near the capacitor 322, and an initial electric field is formed. When the non-metallic sector 212 moves through, it will not affect the electric field, and the initial electric field is maintained basically unchanged. When the metal sector 211 moves through, it will cause a certain disturbance to the electric field, causing the initial electric field to change. The change can be converted into an electrical signal in a timely manner, which is convenient for the metal induction angle measurement module, such as a data processing center, to receive, store and analyze the signal.

[0056] In addition, based on one or more of the above embodiments, please combine Fig. 9 In one embodiment, the metal sensors 300 are sequentially arranged along the same radial direction of the mounting plate 100, and the metal sensors 300 are sequentially staggered along the circumferential direction of the mounting plate 100. In this way, the installation of the metal sensors 300 on the mounting plate 100 (the first plate body and the second plate body) is kept as regular as possible, and the arrangement of the first sectors and the second sectors is made simpler.

[0057] Or see Fig.10 , each metal sensor 300 is staggered in sequence along the circumference of the mounting plate 100; each sector is suitable for encoding the arrangement of each metal sensor 300. In this way, the installation of each metal sensor 300 on the mounting plate 100 (the first plate body and the second plate body) is staggered in the circumferential direction, which helps to reserve enough space in the radial direction for the installation of each metal sensor 300 as much as possible; on the other hand, it helps to fully space every two adjacent metal sensors 300 to avoid mutual interference between the sensing of every two adjacent metal sensors 300.

[0058] In view of this, in a further scheme, due to Fig.10 In the structure shown, when the metal sensors 300 are arranged in a staggered manner along the circumference of the mounting plate 100, in order to ensure the initial position alignment of the metal induction angle measurement module, the first sector and the second sector on each code channel 210 are compared with Figure 3The structure shown requires a certain circumferential misalignment. Therefore, in one embodiment, the encoding disk 200 may include a substrate and a plurality of annular plates arranged on the substrate, each annular plate being arranged in sequence from the center of the substrate to the outer periphery of the substrate, and each annular plate constitutes a code channel 210. At this time, each annular plate can be rotated and adjusted around the center of the substrate, and has a rotation state and a locking state. Among them, the rotation state can be achieved by driving a preset power component; the locking state can be achieved by a locking structure. The locking structure can be but is not limited to an adsorption structure, a snap-on structure, etc. In this way, when each metal sensor 300 is staggered in any form in the circumferential direction of the mounting disk 100, it is only necessary to rotate and adjust each annular plate accordingly.

[0059] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A metal induction angle measurement module, characterized in that: include: Installation disk; A coding disk is coaxially arranged with the mounting disk and is arranged opposite to the mounting disk. The coding disk is rotatable around its central axis. The coding disk is provided with a code track. The code track is provided with a plurality of sectors along its circumference. Each of the sectors is encoded in a Gray code manner to form a metal sector and a non-metal sector; and, A plurality of metal sensors are arranged on the installation disk corresponding to each of the code channels one by one, each of the metal sensors forms an initial electric field quantity and / or an initial magnetic field quantity, and when the metal sector moves through, the initial electric field quantity and / or the initial magnetic field quantity changes.

2. The metal induction angle measurement module according to claim 1, characterized in that: The mounting disk and the encoding disk are spaced apart in the axial direction.

3. The metal induction angle measurement module according to claim 1, characterized in that: The encoding disk is provided with a plurality of circles of code tracks in sequence along its radial direction, and the sectors of each code track are encoded in a Gray code manner.

4. The metal induction angle measurement module according to claim 1, characterized in that: The metal sensor comprises: A magnetic core member, comprising a first magnetic core segment extending along the disk surface of the mounting disk, and two second magnetic core segments protruding from both ends of the first magnetic core segment toward the encoding disk respectively; and, The inductor coils are respectively wound around the two second magnetic core segments, so that when energized, the inductor coils form the initial magnetic field at least on one side of the magnetic core piece close to the encoding disk.

5. The metal induction angle measurement module according to claim 4, characterized in that: The first magnetic core segment is arranged to extend along the circumferential direction or tangential direction of the mounting disk at the location.

6. The metal induction angle measurement module according to claim 4, characterized in that: The metal sensor also includes a mounting seat, which is provided with two mounting holes, the two mounting holes are arranged at intervals, the mounting seat is fixedly mounted on the mounting disk, and the first magnetic core segment is limited between the mounting seat and the disk surface of the mounting disk, and the two second magnetic core segments are respectively passed through the two mounting holes.

7. The metal induction angle measurement module according to claim 6, characterized in that: The inductor coil is spirally wound along the circumferential direction and the protruding direction of the corresponding second magnetic core segment; or, The inductor coil is wound on the mounting seat in multiple turns with the corresponding second magnetic core segment as the center.

8. The metal induction angle measurement module according to claim 1, characterized in that: The metal sensor comprises: A patch, fixedly mounted on the mounting plate; and The capacitor is arranged on the side of the patch facing the encoding disk, and when energized, the capacitor forms the initial electric field at least on the side close to the encoding disk.

9. The metal induction angle measurement module according to any one of claims 1 to 7, characterized in that: The metal sensors are arranged in sequence along the same radial direction of the mounting plate; or, The metal sensors are arranged in a staggered manner in sequence along the circumference of the mounting plate; Wherein, each of the sectors is suitable for encoding according to the arrangement of each of the metal sensors.

10. A measuring device, characterized in that: It comprises the metal induction angle measurement module as described in any one of claims 1 to 9.

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