CN-121977652-A - Target detection device with high protective performance

Abstract

The scheme discloses a target detection device with high protection performance, which comprises a protection shell, a detection coil and an oscillation and signal processing circuit which are packaged in the protection shell, and a target positioned outside the protection shell, wherein the protection shell is an all-metal shell, the oscillation and signal processing circuit is configured to drive the detection coil to work at a target oscillation frequency and process detection signals, and the target oscillation frequency is satisfied, so that the detection signal intensity of the oscillation and signal processing circuit to the target positioned in a target distance is larger than a set threshold value. The detection coil is completely sealed in the full-metal protective shell with high mechanical strength, and simultaneously, the electromagnetic shielding problem of the metal shell is overcome by utilizing the electromagnetic response difference of different conductivity materials and the selection of target working frequency, the improvement of the comprehensive performance including protection and detection is realized, and the technical contradiction that the protection performance and the detection function are difficult to be completed in the traditional scheme is solved.

Inventors

• ZHU XIANGHUI
• JIANG ZHENGQUAN

Assignees

• 杭州全仁电子科技有限公司

Dates

Publication Date

20260505

Application Date

20260313

Claims (10)

1. 1. A target detection device with high protection performance, which comprises a protection shell (3), a detection coil (1) and an oscillation and signal processing circuit (2) which are encapsulated in the protection shell (3), and a target (4) positioned outside the protection shell (3), and is characterized in that, The protective shell (3) is an all-metal shell; the oscillation and signal processing circuit (2) is configured to drive the detection coil (1) to operate at a target oscillation frequency and process a detection signal; The target oscillation frequency is satisfied such that the detected signal strength of the oscillation and signal processing circuit (2) to the target (4) within the target distance is greater than a set threshold.
2. 2. The target detection device with high shielding performance according to claim 1, characterized in that the target (4) is a metal target or an oscillating circuit sensitive to the oscillation frequency.
3. 3. Target detection device with high shielding performance according to claim 2, characterized in that the electrical conductivity of the protective housing (3) is lower than the target (4) so that the electromagnetic parameter variation of the detection coil (1) caused when the target (4) is close is larger than the electromagnetic parameter variation of the detection coil (1) caused by the protective housing (3) itself.
4. 4. A target detection apparatus with high shielding performance according to claim 3, wherein the target oscillation frequency is within the following range: f 2 +80KHz≥f 1 ≥f 2 -40KHz,f 1 ≥10KHz; f 1 denotes a target oscillation frequency, and f 2 denotes a specific oscillation frequency; at the specific oscillation frequency, the difference between the electromagnetic parameter variation of the detection coil (1) caused by the approach of the target (4) and the electromagnetic parameter variation of the detection coil (1) caused by the protective shell (3) is the largest.
5. 5. The target detection device with high shielding performance according to claim 4, wherein the target oscillation frequency is in the range of f 2 +20KHz≥f 1 ≥f 2 -20KHz.
6. 6. The target detection device with high protection performance according to claim 3, wherein the conductivity of the protective shell (3) and the conductivity of the target (4) meet that the conductivity of the target (4) is larger than or equal to the conductivity of the protective shell (3) by 5.
7. 7. The target detection device with high protection performance according to claim 6, wherein the conductivity of the protective shell (3) and the conductivity of the target (4) meet that the conductivity of the target (4) is larger than or equal to the conductivity x 10 of the protective shell (3).
8. 8. Target detection device with high shielding performance according to claim 6 or 7, characterized in that the shielding housing (3) conductivity is below 12MS/m; the conductivity of the target (4) is higher than 30MS/m.
9. 9. The target detection device with high shielding performance according to claim 8, characterized in that the shielding housing (3) has a conductivity below 2.5MS/m; the conductivity of the target (4) is higher than 50MS/m.
10. 10. The target detection device with high protection performance according to claim 1, wherein the target distance is 1-10 mm; The device is entirely of cylindrical or square probe configuration for detecting the target (4) attached to a rotating or rectilinear moving component.

Description

Target detection device with high protective performance Technical Field The invention belongs to the technical field of non-contact metering detection, and particularly relates to a target detection device with high protection performance. Background In the scenes of fluid metering, industrial automatic production line, equipment operation parameter monitoring and the like, parameters such as rotating speed, displacement, position and the like of a moving part are required to be detected in a non-contact mode. Such detection scenes often face severe environments such as humidity, greasy dirt, dust erosion or mechanical collision, and if the sensing element serving as a detection core is directly exposed, the sensing element is easily polluted, worn or impacted to cause the detection accuracy to be reduced or even disabled, so that a protective structure is necessary to be provided for the sensing element. The protection scheme of the existing metering detection equipment is mainly divided into two types, namely a protective shell is made of non-metal materials such as plastics, the shell can not obstruct transmission of detection signals such as electromagnetism and the like, normal implementation of detection functions can be guaranteed, but the mechanical strength is low, corrosion resistance and durability are insufficient, the protective shell is easy to age and damage in an industrial severe environment for a long time and cannot provide reliable physical protection for an induction element, and the protective shell is made of metal materials, and has excellent mechanical strength, sealing performance and environmental corrosion resistance, can effectively resist damage of the severe environment to the internal induction element, but can form electromagnetic shielding on the detection element based on the electromagnetic induction principle, prevent even completely obstruct induction of the coil to an external target, and form technical contradiction that the protection performance and the detection function are difficult to be compatible. In order to solve the contradiction, a compromise means is proposed that a shell is made of a metal material, and a detection surface is replaced by a nonmetallic material or is windowed by a shielding material, so that the detection signal transmission is guaranteed to a certain extent, but the integrity of the shell is damaged by a window structure or the detection surface replacement mode, the protection performance is greatly weakened, the long-acting and reliable protection requirement of the detection element still cannot be met in some scenes needing high protection, and the service life of the detection element is influenced. Disclosure of Invention The invention aims at solving the problems in the prior art, and provides a target detection device with a protective shell and high protective performance, which realizes the improvement of the comprehensive performance including protection and detection, thereby simultaneously meeting the requirements of strength and detection function in a target detection scene. In order to achieve the above purpose, the present invention adopts the following technical scheme: a target detection device with high protection performance comprises a protection shell, a detection coil and an oscillation and signal processing circuit which are encapsulated in the protection shell, and a target positioned outside the protection shell, The protective shell is an all-metal shell; the oscillation and signal processing circuit is configured to drive the detection coil to work at a target oscillation frequency and process a detection signal; The target oscillation frequency is satisfied such that the detected signal strength of the oscillation and signal processing circuit for a target within a target distance is greater than a set threshold. In the target detection device with high protection performance, the target is a metal target or an oscillating circuit sensitive to the oscillating frequency. In the target detection device with high protection performance, the conductivity of the protective shell is lower than that of the target, so that the electromagnetic parameter variation of the detection coil caused by the approach of the target is larger than that of the detection coil caused by the protective shell. In the target detection device with high protection performance, the target oscillation frequency is within the following range: f2+80 KHz≥f1≥f2-40 KHz,f1≥10KHz; f 1 denotes a target oscillation frequency, and f 2 denotes a specific oscillation frequency; And under the specific oscillation frequency, the difference between the electromagnetic parameter variation of the detection coil caused by the approach of the target and the electromagnetic parameter variation of the detection coil caused by the protective shell is the largest. In the target detection device with high protection performance, the target oscillation frequency