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CN-122015918-A - High anti-interference linear Hall sensor suitable for voice coil motor servo valve

CN122015918ACN 122015918 ACN122015918 ACN 122015918ACN-122015918-A

Abstract

The invention discloses a high anti-interference linear Hall sensor suitable for a voice coil motor servo valve, which comprises a mounting seat, a telescopic cylinder, an adjusting sleeve, an opening cone jacket and a magnetic shielding operation sleeve. The magnetic shielding operation sleeve extrudes the open cone jacket through axial movement, so that the open cone jacket radially contracts and hugs tightly the locking adjustment sleeve. The front end of the magnetic shielding operation sleeve is provided with a thin-wall cup cover, and the outer wall of the thin-wall cup cover and the inner wall of the mounting seat form a magnetic shielding labyrinth for reducing the interference of alternating magnetic leakage on the Hall chip. The structure is suitable for position feedback detection of the voice coil motor servo valve.

Inventors

  • WU HONGBO
  • DING PO

Assignees

  • 杭州励贝电液科技有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. High interference immunity linear hall sensor suitable for voice coil motor servo valve, characterized in that includes: a mounting base (1); The telescopic cylinder (10) is arranged in the mounting seat (1), is in limit connection with the mounting seat (1) along the circumferential direction and is in sliding connection along the axial direction, and a Hall chip (16) is arranged at the front end of the telescopic cylinder (10); The adjusting sleeve (12) is arranged in the mounting seat (1) and is in axial limiting connection and circumferential rotating connection with the mounting seat (1), and the adjusting sleeve (12) is in transmission connection with the telescopic cylinder (10) and is configured to convert the rotary motion of the adjusting sleeve (12) into axial sliding of the telescopic cylinder (10); An opening cone jacket (14), wherein the opening cone jacket (14) is arranged on the mounting seat (1) and sleeved outside the adjusting sleeve (12); And a magnetic shielding operation sleeve (4), wherein the magnetic shielding operation sleeve (4) is in sliding fit with the opening cone jacket (14), and the axial movement of the magnetic shielding operation sleeve (4) is configured to squeeze the opening cone jacket (14) so as to enable the opening cone jacket (14) to radially shrink and tightly lock the adjusting sleeve (12); The front end of the magnetic shielding operation sleeve (4) is provided with a thin-wall cup cover, the outer wall of the thin-wall cup cover is sequentially provided with an everting lip (5), a necking ring groove (6), a shielding barrel (7) and a magnetic shielding ring shoulder (8) from front to back, and when the magnetic shielding operation sleeve (4) is in a locking position, the everting lip (5) the necking ring groove (6), the shielding barrel (7) and the magnetic shielding ring shoulder (8) are respectively matched with the inner wall of the mounting seat (1) to form a magnetic shielding labyrinth.
  2. 2. The high interference resistance linear hall sensor according to claim 1, wherein the magnetic shielding operation sleeve (4) is slidably connected with the adjusting sleeve (12) and cannot rotate relatively, so that the magnetic shielding operation sleeve (4) drives the adjusting sleeve (12) to rotate synchronously when rotating.
  3. 3. The high-interference-resistance linear Hall sensor according to claim 1, wherein a spiral groove (13) is formed in the adjusting sleeve (12), a transmission pin (11) is arranged on the outer wall of the telescopic cylinder (10), the transmission pin (11) is in sliding fit with the spiral groove (13), and the telescopic cylinder (10) is connected with the mounting seat (1) through a flat key so as to realize the circumferential limiting connection.
  4. 4. The high-interference-resistance linear Hall sensor according to claim 1, wherein the opening cone jacket (14) is fixedly connected with the mounting seat (1), a cone-shaped groove (9) is formed in the inner wall of the magnetic shielding operation sleeve (4), a conical surface (15) matched with the cone-shaped groove (9) is formed in the outer wall of the opening cone jacket (14), and when the magnetic shielding operation sleeve (4) moves axially in the direction away from the opening cone jacket (14), the inner wall of the cone-shaped groove (9) is clung to and presses the conical surface (15) to drive the opening cone jacket (14) to shrink radially.
  5. 5. The high interference resistance linear Hall sensor according to any one of claims 1 to 4, wherein the mounting seat (1) is provided with an adjusting groove (2) and a fixing ring groove (3), the magnetic shielding operation sleeve (4) is hinged with a handle (19) penetrating out of the adjusting groove (2), the handle (19) is fixedly connected with a hook (20), a reed (21) for pushing the hook (20) into the fixing ring groove (3) is arranged between the hook (20) and the magnetic shielding operation sleeve (4), and when the hook (20) is clamped into the fixing ring groove (3), the magnetic shielding operation sleeve (4) is axially locked.
  6. 6. The high interference immunity linear hall sensor of claim 5, further comprising a return spring, wherein the return spring (18) is disposed between the magnetic shielding operation sleeve (4) and the adjustment sleeve (12), wherein one end of the return spring (18) abuts against the magnetic shielding operation sleeve (4) and the other end abuts against the adjustment sleeve (12), and wherein the return spring (18) is configured to urge the magnetic shielding operation sleeve (4) to return toward the locking position.
  7. 7. The high interference resistance linear hall sensor according to claim 1, wherein the front end of the magnetic shielding operation sleeve (4) and the thin-wall cup cover are of an integrated structure, and the thin-wall cup cover is made of magnetic conductive materials.
  8. 8. The high interference immunity linear hall sensor according to claim 1 or 4, wherein the split cone jacket (14) is provided with an axially extending split slit, so that the split cone jacket (14) has radial elastic contraction and expansion capability.
  9. 9. The voice coil motor servo valve is characterized by comprising a valve core, a permanent magnet (17) and the high-anti-interference linear Hall sensor according to any one of claims 1 to 8, wherein the permanent magnet (17) is fixedly connected to the end face of the valve core, the mounting seat (1) is fixedly mounted on a servo valve end cover, the valve core drives the permanent magnet (17) to extend into the thin-wall cup cover, and the Hall chip (16) and the permanent magnet (17) are oppositely arranged.
  10. 10. Voice coil motor servo valve according to claim 9, characterized in that the permanent magnet (17) and the hall chip (16) are both located within the thin-walled cup when the magnetically shielded operating sleeve (4) is in a locked position.

Description

High anti-interference linear Hall sensor suitable for voice coil motor servo valve Technical Field The invention belongs to the technical field of sensors, and particularly relates to a high-interference-resistance linear Hall sensor suitable for a voice coil motor servo valve. Background Electro-hydraulic servo valves are important actuators in the fields of industrial control, aerospace and the like. Servo valves employing voice coil motor direct drive typically require feedback detection of spool position via hall sensors. The installation accuracy of the Hall sensor and the anti-interference capability in the working process can influence the zero position accuracy and the closed-loop control performance of the servo valve. The prior Hall sensor suitable for the voice coil motor servo valve is installed on the end cover of the servo valve in a threaded mode. During zeroing and locking, the sensor body is susceptible to micro displacement or micro rotation due to the influence of thread clearance and locking, thereby causing the zeroing to change. For a sensor internally packaged with a linear hall chip, small changes in mounting attitude may also change the relative directional relationship between the hall chip and the magnetic field, thereby causing an output signal offset. In addition, the existing sensor shell is of a straight barrel type structure, and alternating magnetic flux leakage generated during operation of the voice coil motor can enter along the installation channel and be overlapped at the Hall chip, so that adverse effect is caused on position detection stability. Accordingly, there is a need for a linear hall sensor that facilitates zero-locking and reduces alternating leakage magnetic interference. Disclosure of Invention The invention aims to solve the technical problem that the high anti-interference linear Hall sensor suitable for the voice coil motor servo valve can solve the problem. In order to achieve the above purpose, the invention adopts the following technical scheme: A high-anti-interference linear Hall sensor suitable for a voice coil motor servo valve comprises a mounting seat, a telescopic cylinder, an adjusting sleeve, an opening cone jacket and a magnetic shielding operation sleeve, wherein a mounting cavity is arranged in the mounting seat, the telescopic cylinder is arranged in the mounting cavity and is in circumferential limit connection and axial sliding connection with the mounting seat, a Hall chip is arranged at the front end of the telescopic cylinder, the adjusting sleeve is arranged in the mounting seat and is in axial limit connection and circumferential rotation connection with the mounting seat, the adjusting sleeve is in transmission connection with the telescopic cylinder so that the rotation motion of the adjusting sleeve is converted into the axial sliding of the telescopic cylinder, the opening cone jacket is arranged on the mounting seat and is sleeved outside the adjusting sleeve, the magnetic shielding operation sleeve is in sliding fit with the opening cone jacket, the axial movement of the magnetic shielding operation sleeve is used for extruding the opening cone jacket so that the opening cone jacket radially contracts and holds the adjusting sleeve tightly, a thin-wall cup cover is arranged at the front end of the magnetic shielding operation sleeve, an outward lip, a shrinkage groove, a shielding cylinder and a magnetic shielding shoulder are sequentially arranged on the outer wall of the thin-wall cup cover, and a magnetic shielding ring groove are respectively matched with the inner wall of the magnetic shielding operation sleeve when the magnetic shielding operation sleeve is in a locking position. Further, the magnetic shielding operation sleeve is in sliding connection with the adjusting sleeve, and the magnetic shielding operation sleeve and the adjusting sleeve cannot rotate relatively, so that the adjusting sleeve is driven to synchronously rotate when the magnetic shielding operation sleeve rotates. Further, a spiral groove is formed in the adjusting sleeve, a transmission pin is arranged on the outer wall of the telescopic cylinder and is in sliding fit with the spiral groove, and the telescopic cylinder is connected with the mounting seat through a flat key to achieve limit connection along the circumferential direction. The magnetic shielding operation sleeve is axially moved in the direction away from the opening cone jacket, and the inner wall of the conical groove is clung to and extrudes the conical surface to drive the opening cone jacket to radially shrink. Further, an adjusting groove and a fixed ring groove are formed in the mounting seat; the magnetic shielding operation sleeve is hinged with a handle penetrating out of the adjusting groove, a hook is fixedly connected to the handle, a reed used for pushing the hook into the fixing ring groove is arranged between the hook and the magnetic shielding operation sleeve, and