An absolute value sensor

Abstract

The application relates to an absolute value sensor, belonging to the field of industrial control technology, which comprises a rotatable rotating disc, an annular magnetic strip attached to the outer periphery of the rotating disc, a magnetic inductor arranged at the outer periphery of the rotating disc and kept in a rotating gap with the magnetic strip, and a control element electrically connected with the magnetic inductor. The application has the effects of facilitating replacement of the annular magnetic strip and saving use cost.

Description

Technical Field

[0001] This utility model relates to the field of industrial control technology, and in particular to an absolute value sensor. Background Technology

[0002] An absolute sensor is a device that directly measures position or angle, with each position point corresponding to a unique absolute code value. Based on photoelectric or magnetoelectric principles, it directly acquires current position information by reading a unique code (such as Gray code) on an encoding disk. Its greatest advantage is that the system can obtain absolute position without homing after power-on, has no accumulated error, and is highly resistant to interference. Therefore, it plays an irreplaceable and crucial role in industrial automation fields such as robotics and CNC machine tools, where high precision, high reliability, and safety are required.

[0003] In existing technology, absolute rotation sensors include a rotating disk that rotates synchronously with a shaft, an annular magnetic strip fixedly attached to the outer circumference of the rotating disk, and a magnetic sensor arranged on the outer circumference of the rotating disk, maintaining a rotational gap with the annular magnetic strip. The magnetic strip is precisely magnetized circumferentially and encoded with a digital signal representing the absolute angular position. During operation, the magnetic sensor directly deduces the real-time absolute angle of the rotating disk by reading the magnetically encoded information on the magnetic strip. However, the magnetic strip and the rotating disk are typically integrated into a single unit, with the annular magnetic strip embedded in a circumferential groove of the rotating disk.

[0004] Regarding the aforementioned technologies, since the annular magnetic strip and the rotating disk are usually integrated, when the magnetic strip is damaged due to impact, aging, or corrosion, it cannot be replaced separately; the entire assembly must be disassembled from the equipment shaft. This process is not only time-consuming and labor-intensive but also results in the discarding of the intact rotating disk, leading to material waste and increased spare parts costs. Therefore, the inventors believe there is a need to provide an absolute value sensor. Utility Model Content

[0005] To facilitate the replacement of the annular magnetic strip and save on usage costs, this application provides an absolute value sensor.

[0006] This application provides an absolute value sensor, which adopts the following technical solution: An absolute value sensor includes a rotatable rotating disk, an annular magnetic strip attached to the outer periphery of the rotating disk, a magnetic sensor arranged on the outer periphery of the rotating disk and maintaining a rotational gap with the annular magnetic strip, and a control element electrically connected to the magnetic sensor.

[0007] By adopting the above technical solution, during operation, the rotating disk drives the annular magnetic strip to rotate synchronously. The magnetic sensor reads the magnetic encoding signal on the annular magnetic strip in a non-contact manner, thereby resolving the absolute angle of the rotating disk in real time and accurately. There is no cumulative error, strong anti-interference ability, and the annular magnetic strip is easy to replace and saves on usage costs.

[0008] Optionally, the magnetic sensor includes a mounting housing, a sensing connector detachably mounted on one side of the mounting housing, and a detection element disposed within the mounting housing. The mounting housing has a receiving groove for arranging the detection element. The end face of the sensing connector faces the annular magnetic strip and has an arc-shaped structure.

[0009] By adopting the above technical solution, the specific structure of the magnetic sensor is disclosed. The induction connector and the mounting housing are detachably connected, which improves maintenance convenience and provides good adaptability, allowing for the matching of rotating disks of different diameters by replacing induction connectors of different specifications. At the same time, the end face of the induction connector adopts an arc-shaped structure, which allows it to fit more closely with the curved contour of the annular magnetic strip, thereby maintaining a constant and consistent gap, which is beneficial to improving the stability and accuracy of signal reading.

[0010] Optionally, the number of magnetic sensors is not less than two sets.

[0011] By adopting the above technical solution and setting up at least two sets of magnetic sensors, placed on both sides of the gap in the annular magnetic strip, the signal blind zone problem caused by the physical gap at the beginning and end of the annular magnetic strip is effectively solved. This design ensures that at least one sensor can read a valid magnetic code signal at any angle, thereby eliminating the risk of signal interruption. It also allows for comparison and fusion of multiple readings, significantly improving the continuity, stability, accuracy, and reliability of signal reading.

[0012] Optionally, the mounting housing has snap-fit ​​grooves at both ends for the induction connector to snap into, and the induction connector has snap-fit ​​protrusions that mate with the snap-fit ​​grooves.

[0013] By adopting the above technical solution, the engagement of the snap-fit ​​protrusion and the snap-fit ​​groove enables the induction connector to be reliably installed and locked without tools, greatly simplifying the process of on-site maintenance and component replacement.

[0014] Optionally, the inner side of the snap-fit ​​protrusion is provided with a snap-fit ​​post, and the mounting housing is provided with a snap-fit ​​hole corresponding to the snap-fit ​​post.

[0015] By adopting the above technical solution, the fit between the locking pin and the locking hole is increased, resulting in a double locking effect. This further enhances the connection strength and stability between the induction connector and the mounting housing, preventing loosening or detachment under vibration.

[0016] Optionally, the sensing connector has a sensing groove on the side near the annular magnetic strip, and the bottom of the sensing groove has a sensing hole for the detection element to pass through.

[0017] By adopting the above technical solution, the induction connector is provided with an induction slot and an induction hole, which facilitates the detection element to pass through the induction hole and be arranged at the bottom of the induction slot, thereby enabling precise alignment with the annular magnetic strip, optimizing the magnetic circuit, and thus ensuring the quality and strength of signal acquisition.

[0018] Optionally, the sensing groove is also fitted with an elastic rubber coating.

[0019] By adopting the above technical solution, an elastic rubber coating is embedded in the sensing groove, which can better fit the curved contour of the annular magnetic strip. The rubber coating can also effectively prevent dust, oil and other contaminants from entering the sensing head and extend the life of the component.

[0020] Optionally, the rotating disk includes a base disk and a rotating ring rotatably mounted on the outer periphery of the base disk.

[0021] By adopting the above technical solution, the rotating disk is designed as a combination structure of a base disk and a rotating ring, which effectively distributes mechanical stress and concentrates the main rotational friction and wear on the rotating ring. When the rotating ring wears out, it can be replaced separately without replacing the entire rotating disk base structure, thereby reducing long-term maintenance costs.

[0022] Optionally, the mounting housing includes a lower housing with an opening at the top and a top cover that covers the top of the lower housing. The lower housing has a mounting groove for mounting the top cover; the top cover also has heat dissipation holes.

[0023] By adopting the above technical solution, the split lower casing and top cover design makes the installation, wiring, and maintenance of internal detection components very convenient. Furthermore, the heat dissipation holes on the top cover can effectively dissipate the heat generated by the electronic components during operation, preventing performance degradation or damage due to overheating, and improving the stability and lifespan of the magnetic sensor.

[0024] Optionally, one end of the lower housing is provided with a wiring hole for the control element wiring to pass through.

[0025] By adopting the above technical solution and setting dedicated wiring holes, the connection lines of control components can be fixed, preventing cables from shaking, falling off, or being damaged by equipment vibration. This not only improves the reliability of the connection but also makes the overall structure neater and safer.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. An absolute value sensor, in operation, a rotating disk drives a ring magnetic strip to rotate synchronously, and a magnetic sensor reads the magnetic encoding signal on the ring magnetic strip in a non-contact manner, thereby resolving the absolute angle of the rotating disk in real time and accurately, with no cumulative error, strong anti-interference ability, and easy replacement of the ring magnetic strip and saving operating costs. 2. By setting up no fewer than two sets of magnetic sensors and placing them on both sides of the gap between the annular magnetic strips, the signal blind zone problem caused by the physical gap at the beginning and end of the magnetic strips is effectively solved; 3. By opening induction slots and induction holes in the induction connector, the detection element can be placed at the bottom of the induction slot through the induction hole, thereby accurately aligning with the annular magnetic strip, optimizing the magnetic circuit, and thus ensuring the quality and strength of signal acquisition. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the absolute value sensor in the embodiments of this application.

[0028] Figure 2 This is an exploded view of the absolute value sensor in the embodiments of this application.

[0029] Figure 3 This is an exploded schematic diagram of the induction connector in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the absolute value sensor in Embodiment 2 of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Rotating disk; 11. Base disk; 12. Rotating ring; 2. Annular magnetic strip; 3. Magnetic sensor; 31. Mounting housing; 311. Receiving groove; 312. Snap-fit ​​groove; 313. Snap-fit ​​hole; 314. Lower housing; 3141. Mounting groove; 3142. Wiring hole; 315. Top cover; 3151. Heat dissipation hole; 32. Induction connector; 321. Induction groove; 3211. Induction hole; 3212. Elastic rubber coating; 322. Snap-fit ​​protrusion; 3221. Snap-fit ​​post; 33. Detection element; 4. Control element. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0033] Example 1 This application discloses an absolute value sensor. (Refer to...) Figure 1 An absolute angle sensor includes a rotatable rotating disk 1, an annular magnetic strip 2 attached to the outer circumference of the rotating disk 1, a magnetic sensor 3 arranged on the outer circumference of the rotating disk 1 and maintaining a rotational gap with the annular magnetic strip 2, and a control element 4 electrically connected to the magnetic sensor 3. When the rotating disk 1 rotates, it drives the annular magnetic strip 2 to rotate. The magnetic sensor 3 reads the magnetic encoding information on the annular magnetic strip 2 and then transmits the information to the control element 4 for processing, thereby realizing the real-time measurement of the absolute angle of the rotating disk 1.

[0034] Reference Figure 1The rotating disk 1 includes a base disk 11 and a rotating ring 12 rotatably mounted on the outer periphery of the base disk 11. The base disk 11 serves to support and fix the disk, while the rotating ring 12 is rotatably mounted on the outer periphery of the base disk 11 via bearings, and the rotating ring 12 can rotate relative to the base disk 11.

[0035] Reference Figure 2 The magnetic sensor 3 includes a mounting housing 31, a sensing connector 32 detachably mounted on one side of the mounting housing 31, and a detection element 33 arranged within the mounting housing 31. The mounting housing 31 has a receiving groove 311 for accommodating the detection element 33. The end face of the sensing connector 32 faces the annular magnetic strip 2 and has an arc-shaped structure. The sensing connector 32 is detachably connected to the mounting housing 31, allowing for the adaptation of different specifications of sensing connectors 32 to match rotating disks 1 of different diameters. The arc-shaped end face of the sensing connector 32 allows it to better fit the curved contour of the annular magnetic strip 2, thereby maintaining a constant and consistent gap, which is beneficial for improving the stability and accuracy of signal reading.

[0036] Reference Figure 1 The number of magnetic sensors 3 is no less than two sets, and they are respectively placed on both sides of the physical gap between the beginning and end of the annular magnetic strip 2, which effectively solves the signal blind zone problem caused by the physical gap between the beginning and end of the annular magnetic strip 2. In this embodiment, the number of magnetic sensors 3 is two sets, and the two sets of magnetic sensors 3 are respectively arranged on both sides of the gap.

[0037] Reference Figure 2 The mounting housing 31 has snap-fit ​​grooves 312 at both ends for the induction connector 32 to snap into. The induction connector 32 has snap-fit ​​protrusions 322 that mate with the snap-fit ​​grooves 312. A snap-fit ​​post 3221 is provided inside the snap-fit ​​protrusion 322, and the mounting housing 31 has a snap-fit ​​hole 313 corresponding to the snap-fit ​​post 3221. This snap-fit ​​structure allows the induction connector 32 to be easily installed and removed from the mounting housing 31, facilitating replacement and maintenance. Furthermore, the mating of the snap-fit ​​post 3221 and the snap-fit ​​hole 313 further enhances the stability of the connection.

[0038] Reference Figure 2 The mounting housing 31 includes a lower housing 314 with an opening at the top and a top cover 315 that covers the top of the lower housing 314. The lower housing 314 has a mounting groove 3141 for mounting the top cover 315; the top cover 315 also has heat dissipation holes 3151. The combined structure of the lower housing 314 and the top cover 315 facilitates the installation and maintenance of the detection element 33, and the heat dissipation holes 3151 can dissipate the heat generated by the detection element 33 during operation in a timely manner, ensuring its normal operation.

[0039] Reference Figure 2One end of the lower housing 314 has a wiring hole 3142 for the control element 4 to pass through. By setting a dedicated wiring hole 3142, the connection line of the control element 4 can be fixed to prevent the cable from shaking, falling off or being damaged by equipment vibration.

[0040] Reference Figure 3 The induction connector 32 has an induction groove 321 on the side near the annular magnetic strip 2, and the bottom of the induction groove 321 has an induction hole 3211 for the detection element 33 to pass through. The induction groove 321 and the induction hole 3211 of the induction connector 32 facilitate the placement of the detection element 33 at the bottom of the induction groove 321 by passing through the induction hole 3211, thereby enabling precise alignment with the annular magnetic strip 2, optimizing the magnetic circuit, and ensuring the quality and strength of signal acquisition.

[0041] Reference Figure 3 The sensing groove 321 is also fitted with an elastic rubber coating 3212. By fitting the elastic rubber coating 3212 into the sensing groove 321, it can better fit the curved contour of the annular magnetic strip 2, and the rubber coating can effectively prevent dust, oil and other contaminants from entering the sensing head, thus extending the life of the component.

[0042] The implementation principle of an absolute sensor in this application embodiment is as follows: When working, an absolute sensor drives the annular magnetic strip 2 to rotate synchronously by a rotating disk 1. The magnetic sensor 3 reads the magnetic encoding signal on the annular magnetic strip 2 in a non-contact manner, thereby resolving the absolute angle of the rotating disk 1 in real time and accurately. It has no cumulative error, strong anti-interference ability, and is easy to replace the annular magnetic strip 2 and saves on usage costs. Specifically, the annular magnetic strip 2 is attached to the outer circumference of the rotating disk 1, which enables the individual replacement of the magnetic strip and avoids material waste and increased spare parts costs; The number of magnetic sensors 3 is no less than two sets, and they are respectively placed on both sides of the physical gap between the beginning and end of the annular magnetic strip 2, which effectively solves the signal blind zone problem caused by the physical gap between the beginning and end of the annular magnetic strip 2. The induction connector 32 and the mounting housing 31 are detachably connected, which can be adapted to different specifications of induction connector 32 to match rotating disks 1 of different diameters. The end face of the induction connector 32 adopts an arc structure, which can fit more closely with the curved contour of the annular magnetic strip 2, thereby maintaining a constant and consistent gap, which is beneficial to improving the stability and accuracy of signal reading.

[0043] Example 2 Compared with Example 1, this embodiment is identical to the absolute value sensor in Example 1 except for the structure of the rotating disk 1.

[0044] Reference Figure 4The rotating disk 1 is a base disk 11 that can be rotated as a whole. The annular magnetic strip 2 is attached to the outer periphery of the base disk 11 and changes position synchronously with the rotation of the base disk 11, providing a reliable motion carrier for the magnetic sensor 3 to stably sense changes in the magnetic field.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An absolute value sensor, characterized in that, It includes a rotatable rotating disk (1), an annular magnetic strip (2) attached to the outer periphery of the rotating disk (1), a magnetic sensor (3) arranged on the outer periphery of the rotating disk (1) and maintaining a rotational gap with the annular magnetic strip (2), and a control element (4) electrically connected to the magnetic sensor (3).

2. An absolute value sensor according to claim 1, characterized in that, The magnetic sensor (3) includes a mounting housing (31), a sensing connector (32) detachably mounted on one side of the mounting housing (31), and a detection element (33) arranged inside the mounting housing (31). The mounting housing (31) has a receiving groove (311) for arranging the detection element (33). The end face of the sensing connector (32) is arranged facing the annular magnetic strip (2) and has an arc-shaped structure.

3. An absolute value sensor according to claim 1, characterized in that, The number of magnetic sensors (3) is no less than two sets.

4. An absolute value sensor according to claim 2, characterized in that, The mounting housing (31) has snap-fit ​​grooves (312) at both ends for the induction connector (32) to snap into, and the induction connector (32) has snap-fit ​​protrusions (322) that cooperate with the snap-fit ​​grooves (312).

5. An absolute value sensor according to claim 4, characterized in that, The inner side of the snap-fit ​​protrusion (322) is provided with a snap-fit ​​post (3221), and the mounting housing (31) is provided with a snap-fit ​​hole (313) corresponding to the snap-fit ​​post (3221).

6. An absolute value sensor according to claim 2, characterized in that, The sensing connector (32) has a sensing groove (321) on the side near the annular magnetic strip (2), and the bottom of the sensing groove (321) has a sensing hole (3211) for the detection element (33) to pass through.

7. An absolute value sensor according to claim 6, characterized in that, The sensing groove (321) is also fitted with an elastic rubber coating (3212).

8. An absolute value sensor according to claim 1, characterized in that, The rotating disk (1) includes a base disk (11) and a rotating ring (12) rotatably mounted on the outer periphery of the base disk (11).

9. An absolute value sensor according to claim 2, characterized in that, The mounting housing (31) includes a lower housing (314) with an opening at the upper end and a top cover (315) covering the top of the lower housing (314). The lower housing (314) has a mounting groove (3141) for mounting the top cover (315). The top cover (315) also has a heat dissipation hole (3151).

10. An absolute value sensor according to claim 9, characterized in that, One end of the lower housing (314) is provided with a wiring hole (3142) for the control element (4) wiring to pass through.

Images