Anti-interference dual-redundancy magnetic shielding inductance type proximity sensor and debugging method

Abstract

The invention discloses an anti-interference dual-redundancy magnetic shielding inductive proximity sensor and a debugging method, and relates to the technical field of inductive proximity sensors. In order to solve the problems that in the prior art, signals interfere with each other when a sensor is installed at a short distance, and an existing dual-redundancy product is poor in anti-interference performance and complex to assemble and debug, the following technical scheme is provided: an anti-interference dual-redundancy magnetic shielding inductance type proximity sensor. Comprising an eddy current isolation plate, a support plate, a shell, an upper cover plate and two sets of mutually independent sensitive elements with the same structure, each sensitive element comprises a coil winding and a core body, the core body is inserted into the coil winding, a magnetic shielding cover is sleeved on the peripheries of the coil winding and the core body, and two ends of the magnetic shielding cover are provided with gaps. And the supporting seat is used for fixing the coil winding and the magnetic shielding cover. According to the invention, the magnetic shielding case and the eddy current isolation plate are adopted, so that interference of dual-redundancy signals and an external environment is effectively isolated, and the complexity of assembly and debugging is reduced at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of inductive proximity sensors, and in particular to an anti-interference dual-redundancy magnetic shielding inductive proximity sensor and a debugging method. Background Art

[0002] Based on their principles, proximity sensors can be categorized as inductive, eddy-current, capacitive, and Hall-effect sensors. Inductive proximity sensors utilize the changes in the self-inductance of a coil and the mutual inductance between coils, a phenomenon known as electromagnetic induction, to achieve measurement. The basic operating principle of an inductive proximity sensor is that when a metal object moves, the air gap between the proximity sensor's sensitive element and the metal object changes, causing a change in magnetic resistance and, consequently, a change in the coil's inductance. This change in inductance corresponds to the change in the object's position, enabling non-contact measurement.

[0003] With scientific and technological advancements, inductive proximity sensors are increasingly used in the aviation industry. Due to the high safety and reliability requirements of aviation, multiple redundant measurements are required to comprehensively assess the position of the measured object in the same location to meet these high reliability and safety requirements. Space constraints in aviation necessitate the installation of two or more inductive proximity sensors within a relatively small space, resulting in the sensors being installed relatively close together. When these sensors are installed close together, mutual induction oscillation can occur, leading to unstable output. Therefore, a small, independent, and non-interfering dual-redundant inductive proximity sensor is needed. Because inductive proximity sensors primarily utilize electromagnetic induction, they can experience sensing failure or malfunction in the presence of magnetic metal. Therefore, when detection accuracy is critical or when the inductive proximity sensor is mounted near metal objects, an inductive proximity sensor with improved resistance to ambient interference is required.

[0004] At present, the existing dual-redundancy inductive proximity sensors can only realize two independent signals without interfering with each other, have poor resistance to interference from the surrounding environment, and the assembly and debugging methods are too complicated in engineering applications. Therefore, a design and debugging method of an engineering, small-volume, high-sensitivity, anti-environmental interference, dual-redundancy magnetic shielding inductive proximity sensor is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-interference dual-redundancy magnetic shielded inductive proximity sensor to solve the problems in the prior art of mutual signal interference when sensors are installed in close proximity, susceptibility to the influence of the surrounding metal environment, and poor anti-interference performance of existing dual-redundancy products and complex assembly and debugging.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: An anti-interference dual-redundancy magnetic shielding inductive proximity sensor includes an eddy current isolation plate, a support plate, a housing, an upper cover plate, and two sets of sensitive elements with identical structures and independent of each other. The sensitive elements include coil windings and a core body. The core body is inserted into the coil windings. A magnetic shielding cover is sleeved around the coil windings and the outer periphery of the core body. Notches are provided at both ends of the magnetic shielding cover, as well as a support base for fixing the coil windings and the magnetic shielding cover. The eddy current isolation plate is arranged between the two sets of sensitive elements. The support plate is connected to the core body by screws to fix the sensitive elements in the housing. The upper cover plate is welded and sealed to the housing. A connector for realizing external electrical connection of the sensor is also included. The two sets of sensitive elements are arranged at a 90° angle in the housing to achieve dual-redundancy independent output without interfering with each other.

[0007] Furthermore, the magnetic shield is made of a material with high magnetic permeability, and the positions of the notches at both ends of the magnetic shield correspond to the arched notches of the support seat.

[0008] Furthermore, the eddy current isolation plate is a rectangular parallelepiped structure and is vertically inserted between the two sets of sensitive elements.

[0009] Furthermore, the housing, upper cover and connector are made of stainless steel 022Cr17Ni12Mo2 material and are laser welded to form a sealed structure.

[0010] Furthermore, the assembly gap between the coil winding and the core, the gap size of the magnetic shielding cover and the insertion position of the eddy current isolation plate are key debugging parameters. By adjusting the above parameters, the high sensitivity and anti-interference performance of the sensor can be achieved.

[0011] A debugging method for an anti-interference dual-redundancy magnetic shielding inductive proximity sensor comprises the following steps: S1: Insert the coil winding into the core and adjust the core insertion depth to set the initial inductance value; S2: Install the components in S1 into the support base and magnetic shield, ensuring that the notch of the magnetic shield is aligned with the arched notch of the support base; S3: Install two sets of sensitive elements in the housing at a 90° angle; S4: Insert the eddy current isolation plate between the two sets of sensitive components; S5: Fix the sensitive element with a support plate and screws, and weld the support plate to the housing; S6: Use DG-4 silicone to seal the internal gap; S7: Laser weld the upper cover to the housing and seal them, and solder the leads into the corresponding pins of the connector.

[0012] Furthermore, in S3, the 90° arrangement of the two sets of sensitive elements is achieved through a positioning structure within the housing.

[0013] Furthermore, in S6, the DG-4 silicone potting material needs to completely fill the gap between the sensitive element and the housing.

[0014] The present invention has the following beneficial effects: 1. Ability to resist interference from the surrounding environment: The present invention designs a magnetic shield and an eddy current isolation plate, which not only isolates the two redundant inductance signals, but also realizes anti-interference design from the surrounding environment while ensuring high sensitivity; 2. Engineering design: The present invention only designs a magnetic shield and a rectangular eddy current isolation plate on each redundancy, which reduces the debugging process and the complex assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the device of the present invention; Figure 2 This is a schematic diagram of the sensor principle of the present invention; Figure 3 This is a schematic diagram of the sensor structure of the present invention; Figure 4 This is a schematic diagram of the installation of the sensor connector of the present invention; Figure 5 This is a schematic diagram of the installation of the magnetic shield and the sensitive element of the present invention; Figure 6 This is a schematic diagram of the structure of the magnetic shield of the present invention; Figure 7 This is a flowchart of debugging the present invention.

[0016] Figures 1 to 7 The reference numerals shown in the figure represent: 1-coil winding, 2-core, 3-support base, 4-magnetic shielding cover, 5-eddy current isolation plate, 6-support plate, 7-housing, 8-upper cover, 9-connector. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] This embodiment of an anti-interference, dual-redundant, magnetically shielded inductive proximity sensor consists of a housing 7, an upper cover 8, and a connector 9. These housing 7, upper cover 8, and connector 9 are preferably made of 022Cr17Ni12Mo2 stainless steel and sealed together using a laser welding process to form a robust and reliable seal. Connector 9 provides external electrical connections to the sensor.

[0019] like Figure 1 、 3As shown in FIG. 4 , the present invention mainly includes two sets of sensitive elements with the same structure and independent of each other, and an eddy current isolation plate 5 for isolating the two sets of sensitive elements.

[0020] Each sensitive element consists of a coil winding 1, a core 2, a support base 3, and a magnetic shield 4. The assembly is as follows: the core 2 is inserted into the coil winding 1, and the coil-core assembly is then mounted in the support base 3, with the magnetic shield 4 sleeved around its periphery.

[0021] like Figure 2 As shown in Figure 1, the operating principle of this sensor is as follows: When current flows through coil winding 1, a magnetic field is generated. The coil in this magnetic field generates inductance. The magnitude of the inductance is affected by the magnetic resistance of the magnetic circuit in which it resides, which consists of the iron core, the target, and the air gap between them. When the air gap changes, the magnetic resistance changes accordingly, causing the coil output inductance to change, thus achieving non-contact measurement.

[0022] like Figure 5 、 6 As shown, in order to solve the problem of dual-redundancy internal interference and external environmental interference, the following design is adopted: The two sets of sensitive components are arranged at a 90° angle in the housing 7. This is to prevent the magnetic flux between the two sets of components from interlinking, which is one of the core measures to achieve dual-redundancy signal independence and non-interference.

[0023] Then, a rectangular eddy current isolation plate 5 is vertically inserted between the two sets of sensitive elements arranged at 90 degrees. The isolation plate is used to further isolate the possible magnetic field coupling between the two sets of elements, thereby enhancing the independence of the signals.

[0024] Finally, each sensitive element is equipped with a magnetic shield 4. This shield is preferably made of a high-permeability material. It not only effectively shields against environmental interference such as metallic objects and electromagnetic fields surrounding the sensor, but also internally isolates the two redundant inductive signals. To ensure high sensitivity, the shield is notched at both ends, and the notches must align with the arched notches in the support base 3.

[0025] In addition, the assembly gap between the coil winding 1 and the core 2, the notch size of the magnetic shield 4, and the insertion position of the eddy current isolation plate 5 are key debugging parameters for achieving high sensitivity and strong anti-interference performance of the sensor.

[0026] As attached Figure 7 As shown, the present invention also provides a debugging method based on the above sensor, which specifically includes the following steps: S1: Insert the coil winding 1 into the core 2, and set and debug the initial inductance value of the product by adjusting the insertion depth of the core 2.

[0027] S2: Install the assembly completed in step S1 into the support base 3 and the magnetic shield 4 to form a complete sensitive element. In this step, it is necessary to ensure that the notch of the magnetic shield 4 is aligned with the arched notch of the support base 3.

[0028] S3: Install the two sets of prepared sensitive elements in the housing 7 at an angle of 90°. The 90° arrangement is achieved by the positioning structure inside the housing 7 to ensure the accuracy of the angle.

[0029] S4: Insert the eddy current isolation plate 5 into the housing 7 and place it between the two sets of sensitive components.

[0030] S5: Fix the sensitive element with the support plate 6 and screws. Specifically, the support plate 6 and the housing 7 are welded together to form a reinforcing rib, and then screws are inserted into the support plate 6 to connect with the core 2 of the sensitive element, thereby firmly fixing it.

[0031] S6: Use DG-4 silicone to potting the internal gap. The potting material must completely fill the gap between the sensitive element and the housing 7 to achieve fixation, vibration reduction and protection.

[0032] S7: The upper cover 8 and the housing 7 are sealed by laser welding, and the coil leads are welded to the corresponding pins of the connector 9. Finally, the connector 9 is welded to the entire assembly to complete the final package.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-interference dual-redundancy magnetic shielding inductive proximity sensor, characterized in that: The invention comprises an eddy current isolation plate (5), a support plate (6), a shell (7), an upper cover plate (8) and two sets of sensitive elements with identical structures and independent of each other, wherein the sensitive element comprises a coil winding (1) and a core body (2), the core body being inserted into the coil winding (1), the magnetic shielding cover (4) being sleeved on the outer periphery of the coil winding (1) and the core body (2), the magnetic shielding cover (4) being provided with notches at both ends, and a support seat for fixing the coil winding (1) and the magnetic shielding cover (4); the eddy current isolation plate (5) being provided between the two sets of the sensitive elements, the support plate (6) being connected to the core body (2) by screws, and fixing the sensitive elements in the shell (7); the upper cover plate (8) and the shell (7) being welded and sealed; and a connector (9) for realizing external electrical connection of the sensor; wherein the two sets of sensitive elements are arranged at a 90° angle in the shell (7) to realize dual-redundancy independent output without mutual interference.

2. The anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 1, characterized in that: The magnetic shield (4) is made of a high magnetic permeability material, and the positions of the notches at both ends thereof correspond to the arched notches of the support seat (3).

3. The anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 1, characterized in that: The eddy current isolation plate (5) is a rectangular parallelepiped structure and is vertically inserted between the two sets of sensitive elements.

4. The anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 1, characterized in that: The housing (7), upper cover plate (8) and connector (9) are made of stainless steel 022Cr17Ni12Mo2 material and are laser welded to form a sealed structure.

5. The anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 4, characterized in that: The assembly gap between the coil winding (1) and the core (2), the notch size of the magnetic shield (4), and the insertion position of the eddy current isolation plate (5) are key debugging parameters. By adjusting the above parameters, high sensitivity and anti-interference performance of the sensor can be achieved.

6. A debugging method for an anti-interference dual-redundancy magnetic shielding inductive proximity sensor, characterized in that: The anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to any one of claims 1 to 5 is implemented, comprising the following steps: S1: insert the coil winding (1) into the core (2), and adjust the insertion depth of the core (2) to set the initial inductance value; S2: Install the components in S1 into the support base (3) and the magnetic shield (4), ensuring that the notch of the magnetic shield (4) is aligned with the arched notch of the support base (3); S3: Install two sets of sensitive elements in the housing (7) at an angle of 90°; S4: insert the eddy current isolation plate (5) between the two sets of sensitive elements; S5: Fix the sensitive element through the support plate (6) and screws, and weld the support plate (6) to the housing (7); S6: Use DG-4 silicone to seal the internal gap; S7: Laser weld the upper cover (8) and the housing (7) to seal, and weld the leads into the corresponding pins of the connector (9).

7. The debugging method of the anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 6, characterized in that: In the above-mentioned S3, the 90° arrangement of the two sets of sensitive elements is achieved by a positioning structure in the housing (7).

8. The debugging method of the anti-interference dual-redundancy magnetic shielding inductive proximity sensor according to claim 6, characterized in that: In the S6, the DG-4 silicone potting material needs to completely fill the gap between the sensitive element and the housing (7).

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