Magnetic sensor with double shielding layers

Abstract

The invention discloses a double-shielding-layer magnetic sensor, and belongs to the technical field of magnetic sensors. Comprising an outer shielding bottom cavity, an inner shielding layer is fixedly connected in the outer shielding bottom cavity, a sensor is arranged in the inner shielding layer, and a sealing groove is formed in the upper surface of the outer shielding bottom cavity; the outer shielding layer composed of the outer shielding bottom cavity and the outer shielding top cavity is matched with the inner shielding layer fixedly connected inside to form a double-magnetic-field protection barrier, an external interference magnetic field is blocked and attenuated through the outer shielding layer, a small amount of penetrating magnetic field is further isolated through the inner shielding layer, it is ensured that the sensor is in an interference-magnetic-field-free environment, and the detection precision is greatly improved. In the aspect of connection and fixation, a motor drives a power gear, a linkage transmission gear I, a transmission long belt I and a rotating rod I to achieve synchronous rotation, an L-shaped clamping rod is driven to turn over, and a pressure block is attached to a clamping cavity to apply pressure.

Description

Technical Field

[0001] This invention relates to magnetic sensor technology, and more particularly to a double-shielded magnetic sensor. Background Technology

[0002] Magnetic sensors are core detection components in industrial control, automotive electronics, aerospace, and other fields, and their detection accuracy and stability directly determine the operational performance of terminal equipment. However, in complex application environments, external interference magnetic fields (such as electromagnetic fields from industrial equipment, environmental geomagnetic fluctuations, etc.), vibration, shock, dust, and moisture severely restrict the effectiveness of traditional magnetic sensors. In existing technologies, most magnetic sensors employ a single-layer shielding structure, which is insufficient to effectively isolate strong interference magnetic fields, leading to signal distortion. The shielding cavity is often connected by bolts or simple snap-fit ​​mechanisms. Bolt fixing is inconvenient and inefficient, while simple snap-fit ​​mechanisms are prone to loosening due to vibration, resulting in insufficient sealing performance and allowing external impurities to easily penetrate and corrode internal components. Furthermore, the lack of elastic buffer structures means that rigid connections are prone to component wear under vibration, shortening their lifespan. In addition, traditional sensor installation often relies on manual operation, making it difficult to adapt to the batch assembly requirements of automated production lines. These technical limitations restrict the application of traditional magnetic sensors in high-precision and harsh environments. There is an urgent need to develop a double-shielded magnetic sensor with excellent shielding effect, stable and reliable connection, good sealing performance and adaptability to automated operation, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to solve the problems of weak anti-interference of single-layer shielding, easy loosening of connection, insufficient sealing and poor vibration resistance of traditional magnetic sensors, so as to ensure the detection accuracy and structural durability of the sensor. Another purpose of this invention is to solve the problems of low efficiency of manual assembly, cumbersome maintenance and limited adaptability of traditional sensors, so as to meet the needs of automated batch operation and high-precision magnetic signal detection in multiple fields.

[0004] Technical solution: A double-shielded magnetic sensor, comprising an outer shielding cavity, an inner shielding layer fixedly connected inside the outer shielding cavity, a sensor disposed inside the inner shielding layer, a sealing groove formed on the upper surface of the outer shielding cavity, an outer shielding top cavity formed on the upper surface of the outer shielding cavity, and a sealing strip fixedly connected to the lower surface of the outer shielding top cavity, the sealing strip engaging with the interior of the sealing groove.

[0005] Furthermore, the outer wall of the outer shielding cavity is symmetrically fixedly connected with grooved blocks, and the inside of the grooved blocks is symmetrically provided with rotating grooves. A rotating rod is rotatably connected inside the rotating groove on the left side. Inside the grooved blocks, an L-shaped locking rod is fixedly connected to the outer wall of the rotating rod. Pressure blocks are fixedly connected to the opposite ends of the L-shaped locking rod. A transmission gear is fixedly connected to the opposite ends of the rotating rod. A transmission side gear is symmetrically fixedly connected to the outer wall of the outer shielding cavity. A transmission belt is meshed with the outer wall of the transmission gear and the transmission side gear.

[0006] Furthermore, a rotating rod 2 is rotatably connected inside the rotating groove on the right side, and a transmission gear 2 is fixedly connected to the opposite ends of the rotating rod 2. A transmission side gear 2 is symmetrically fixedly connected to the outer wall of the outer shielding cavity, and a transmission long belt 2 meshes with the outer wall of the transmission side gear 2.

[0007] Furthermore, motors are symmetrically fixedly connected to the outer side wall of the outer shield cavity, and each motor's output end is rotatably connected to a power gear. The two power gears are respectively meshed with the first transmission gear and the second transmission gear on the same side.

[0008] Furthermore, a retaining cavity is fixedly connected to the upper surface of the outer shielding top cavity, and spring grooves are symmetrically fixedly connected to the lower surface of the pressure block. A spring is fixedly connected inside the spring groove, and a pressing plate is fixedly connected to the bottom end of the spring. A transverse groove is opened on the outer side wall of the pressure block on the left side, and a wedge plate is slidably connected inside the transverse groove. Multiple short springs are fixedly connected between the transverse groove and the wedge plate.

[0009] Furthermore, a sliding groove is formed on the inner upper surface of the transverse groove, and an extrusion plate is slidably connected inside the sliding groove. Multiple inner sliding holes are formed inside the transverse groove, and sliding columns are slidably connected inside the inner sliding holes. The rear surface of the extrusion plate is fixedly connected to the front end of the sliding column.

[0010] Beneficial Effects: The outer shielding layer, composed of the outer shielding bottom cavity and the outer shielding top cavity, combined with the internally fixed inner shielding layer, forms a double magnetic field protection barrier. External interference magnetic fields are first blocked and attenuated by the outer shielding layer, and any small amount of penetrating magnetic field is further isolated by the inner shielding layer, ensuring that the sensor is in an interference-free magnetic field environment and significantly improving detection accuracy. Regarding connection and fixation, the motor drives the power gear, which in turn drives the transmission gear one, the transmission belt one, and the rotating rod one to rotate synchronously, causing the L-shaped locking rod to flip. The pressure block fits against the locking cavity and applies pressure. Combined with the wedge plate, which is engaged in the locking groove under the action of a short spring, a mechanical lock is formed. This, along with the engagement of the sealing strip and the sealing groove, constitutes a triple fixing structure of "preliminary positioning + mechanical locking + pressure clamping," effectively preventing loosening caused by vibration. The spring in the spring groove and the compression plate form an elastic buffer, which not only offsets the impact of vibration but also ensures complete contact of the sealing surface, achieving excellent sealing performance, preventing dust and moisture intrusion, extending the service life of components, and adapting to complex scenarios such as industrial vibration and harsh outdoor environments.

[0011] This double-shielded magnetic sensor boasts automated operation advantages and wide adaptability, significantly improving installation efficiency and practical value. Through a motor-driven transmission mechanism, it achieves automatic positioning, clamping, and locking of the shielding top cavity, eliminating the need for manual tightening, reducing operational difficulty, and adapting to the batch assembly needs of automated production lines, greatly improving production efficiency. The synchronous transmission design of transmission belt one and transmission belt two ensures consistent rotation of rotating rod one and rod two on both sides, resulting in uniform pressure application from the pressure block and preventing deformation of the shielding cavity due to excessive localized force, thus ensuring the integrity of the shielding structure. The elastic structure and adjustable design enhance adaptability; the spring's extension and contraction characteristics can accommodate slight dimensional deviations between the outer shielding top and bottom cavities. The pressing plate, through the sliding of the sliding column within the groove, can flexibly adjust the clamping force on the wedge plate to adapt to different working conditions. Simultaneously, the structure is easy to disassemble and assemble; maintenance only requires reversing the motor to unlock, reducing maintenance costs. The sensor's symmetrical structural design gives it excellent stability and can be widely used in magnetic signal detection in various fields such as automotive electronics, industrial control, and aerospace, possessing strong promotional prospects and practical value. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the pressure block of the present invention; Figure 3 This is a schematic diagram of the transmission belt structure of the present invention; Figure 4 This is a schematic diagram of the overall structure of the shielding cavity of the present invention; Figure 5 This is a schematic diagram of the overall structure of the outer shielding top cavity of the present invention.

[0013] In the diagram: 1. Outer shield bottom cavity; 2. Inner shield layer; 3. Sealing groove; 4. Outer shield top cavity; 5. Sealing strip; 6. Grooved block; 7. Rotary groove; 8. Rotating rod one; 9. L-shaped locking rod; 10. Pressure block; 11. Transmission gear one; 12. Transmission side gear one; 13. Transmission long belt one; 14. Rotating rod two; 15. Transmission gear two; 16. Transmission side gear two; 17. Transmission long belt two; 18. Motor; 19. Power gear; 20. Locking cavity; 21. Spring groove; 22. Spring; 23. Extrusion plate; 24. Horizontal groove; 25. Wedge plate; 26. Short spring; 27. Sliding groove; 28. Extrusion plate; 29. ​​Inner sliding hole; 30. Sliding column. Detailed Implementation

[0014] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Example like Figures 1-5 As shown, a double-shielded magnetic sensor is provided, including an outer shielded cavity 1, an inner shielded layer 2 fixedly connected inside the outer shielded cavity 1, and a sensor disposed inside the inner shielded layer 2. A sealing groove 3 is formed on the upper surface of the outer shielded cavity 1, and an outer shielded top cavity 4 is formed on the upper surface of the outer shielded cavity 1. A sealing strip 5 is fixedly connected to the lower surface of the outer shielded top cavity 4, and the sealing strip 5 engages with the interior of the sealing groove 3. Grooved blocks 6 are symmetrically fixedly connected to the outer walls of the outer shielded cavity 1. Rotary grooves 7 are symmetrically formed inside the grooved blocks 6. A rotating rod 8 is rotatably connected inside the left rotating groove 7. An L-shaped locking rod 9 is fixedly connected to the outer wall of the rotating rod 8 inside the grooved blocks 6. Pressure blocks 10 are fixedly connected to the opposite ends of the L-shaped locking rod 9. Pressure blocks 10 are also fixedly connected to the opposite ends of the rotating rod 8. A transmission gear 11 is fixedly connected. A transmission side gear 12 is symmetrically fixedly connected to the outer side wall of the outer shielding cavity 1. A transmission long belt 13 is meshed with the outer side walls of both the transmission gear 11 and the transmission side gear 12. A rotating rod 14 is rotatably connected inside the right rotating groove 7. A transmission gear 15 is fixedly connected to the opposite ends of the rotating rod 14. A transmission side gear 16 is symmetrically fixedly connected to the outer side wall of the outer shielding cavity 1. A transmission long belt 17 is meshed with the outer side walls of the transmission gear 15 and the transmission side gear 16. A motor 18 is symmetrically fixedly connected to the outer side wall of the outer shielding cavity 1. A power gear 19 is rotatably connected to the output end of the motor 18. The two power gears 19 are meshed with the transmission gear 11 and the transmission side gear 16 on the same side, respectively. Sensors are pre-installed in the inner shielding layer 2, which is fixedly connected inside the outer shielding bottom cavity 1. In the initial state, the outer shielding top cavity 4 is initially positioned by engaging the sealing strip 5 on the lower surface with the sealing groove 3 on the upper surface of the outer shielding bottom cavity 1. Subsequently, the motors 18, which are symmetrically fixed on the outer side wall of the outer shielding bottom cavity 1, start synchronously. The output end drives the power gear 19 to rotate. The left power gear 19 meshes with the transmission gear 11, causing the rotating rod 8 to rotate in the groove 7 with the groove block 6. The right power gear 19 meshes with the transmission side gear 16, triggering the transmission belt 17 to move together. The transmission belt 13 simultaneously meshes with the transmission gear 11 and the transmission side gear 12, causing the rotating rods 8 on both sides to rotate synchronously. The transmission belt 17 meshes with the transmission gear 15 and the transmission side gear 12. Side gear 16 drives rotating rod 14 to rotate synchronously in the right rotating groove 7. When rotating rod 18 rotates, it drives the L-shaped clamp 9 fixed on the outer wall to rotate synchronously. The pressure block 10 at its opposite end gradually fits against the edge of the upper surface of the outer shielding top cavity 4 and applies stable pressure, firmly pressing the outer shielding top cavity 4 onto the outer shielding bottom cavity 1, so that the sealing strip 5 and the sealing groove 3 are completely fitted to form a tight seal. Finally, the outer shielding bottom cavity 1 and the outer shielding top cavity 4 form a complete outer shielding layer, which, together with the inner shielding layer 2, forms double protection. The external interference magnetic field is first blocked and attenuated by the outer shielding layer, and the small amount of penetrating magnetic field is further isolated by the inner shielding layer 2, ensuring that the sensor can stably perform magnetic signal detection and transmission in the interference-free magnetic field environment inside the inner shielding layer 2.

[0016] In this embodiment, a locking cavity 20 is fixedly connected to the upper surface of the outer shielding top cavity 4, and spring grooves 21 are symmetrically fixedly connected to the lower surface of the pressure block 10. A spring 22 is fixedly connected inside the spring groove 21, and a pressing plate 23 is fixedly connected to the bottom end of the spring 22. A transverse groove 24 is opened on the outer side wall of the left pressure block 10. A wedge plate 25 is slidably connected inside the transverse groove 24. A plurality of short springs 26 are fixedly connected between the transverse groove 24 and the wedge plate 25. A sliding groove 27 is opened on the upper surface inside the transverse groove 24. A pressing plate 28 is slidably connected inside the sliding groove 27. A plurality of inner sliding holes 29 are opened inside the transverse groove 24. A sliding column 30 is slidably connected inside the inner sliding hole 29. The rear surface of the pressing plate 28 is fixedly connected to the front end of the sliding column 30. When the L-shaped locking rod 9 is rotated towards the locking cavity 20 by the rotating rod 8, the pressure block 10 presses down and gradually approaches the locking cavity 20 fixedly connected to the upper surface of the outer shielding top cavity 4. The extrusion plate 23 in the spring groove 21 symmetrically fixed on the lower surface of the pressure block 10 first fits against the upper surface of the locking cavity 20. As the L-shaped locking rod 9 continues to apply pressure, the extrusion plate 23 compresses the spring 22 inside the spring groove 21 to generate elastic buffering force. At the same time, the wedge plate 25 in the transverse groove 24 on the outer side wall of the left pressure block 10 slides towards the locking cavity 20 under the elastic thrust of multiple short springs 26, and finally locks into the locking cavity. Mechanical locking is achieved in the adapter slot of cavity 20, while the extrusion plate 28 in the sliding groove 27 on the upper surface of the transverse groove 24 can be adjusted back and forth by the sliding column 30 connected in the inner sliding hole 29. The front end of the sliding column 30 is fixedly connected to the rear surface of the extrusion plate 28. The locking effect is further strengthened by the extrusion plate 28 adhering to the wedge plate 25, so that the pressure block 10 and the cavity 20 are tightly fitted and not easy to loosen. This not only enhances the connection stability between the outer shielding top cavity 4 and the outer shielding bottom cavity 1, but also offsets the vibration effect through the buffering effect of the spring 22, ensuring the reliability of the sealing structure and the protection of the double shielding layer.

[0017] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. Double shielded magnetic sensor comprising an outer shielded bottom cavity (1), characterized in that: The inner shield layer (2) is fixedly connected inside the outer shielding bottom cavity (1), the sensor is arranged inside the inner shield layer (2), the upper surface of the outer shielding bottom cavity (1) is provided with a sealing groove (3), the upper surface of the outer shielding bottom cavity (1) is provided with an outer shielding top cavity (4), the lower surface of the outer shielding top cavity (4) is fixedly connected with a sealing clamping strip (5), and the sealing clamping strip (5) is clampedly connected with the inside of the sealing groove (3).

2. The double shielded magnetic sensor of claim 1, wherein: The outer side wall of the outer shielding bottom cavity (1) is fixedly connected with a grooved block (6) in a symmetrical manner, the inside of the grooved block (6) is provided with a rotating groove (7) in a symmetrical manner, the inside of the left rotating groove (7) is rotatably connected with a rotating rod one (8), the inside of the grooved block (6) is fixedly connected with an L-shaped clamping rod (9) on the outer side wall of the rotating rod one (8), the opposite ends of the L-shaped clamping rod (9) are fixedly connected with pressure blocks (10), the opposite ends of the rotating rod one (8) are fixedly connected with transmission gears one (11), the outer side wall of the outer shielding bottom cavity (1) is fixedly connected with transmission side gears one (12) in a symmetrical manner, and the outer side wall of the transmission gears one (11) and the transmission side gears one (12) is rotatably connected with a transmission long belt one (13).

3. The double shielded magnetic sensor of claim 2, wherein: The inside of the right rotating groove (7) is rotatably connected with a rotating rod two (14), the opposite ends of the rotating rod two (14) are fixedly connected with transmission gears two (15), and the outer side wall of the outer shielding bottom cavity (1) is fixedly connected with transmission side gears two (16) in a symmetrical manner; the transmission gears two (15) and the transmission side gears two (16) are rotatably connected with a transmission long belt two (17).

4. The dual shielded layer magnetic sensor of claim 1, wherein: The outer side wall of the outer shielding bottom cavity (1) is fixedly connected with a motor (18) in a symmetrical manner, the output ends of the motor (18) are rotatably connected with power gears (19), and the two power gears (19) are rotatably connected with the transmission gears one (11) and the transmission side gears two (16) on the same side respectively.

5. The dual shielded layer magnetic sensor of claim 1, wherein: The upper surface of the outer shielding top cavity (4) is fixedly connected with a clamping cavity (20), the lower surface of the pressure blocks (10) is fixedly connected with a plurality of elastic grooves (21) in a symmetrical manner, the inside of the elastic grooves (21) is fixedly connected with springs (22), the bottom end of the springs (22) is fixedly connected with extrusion discs (23), the outer side wall of the left pressure blocks (10) is provided with horizontal grooves (24), the inside of the horizontal grooves (24) is slidably connected with wedge-shaped plates (25), and the horizontal grooves (24) and the wedge-shaped plates (25) are fixedly connected with a plurality of short springs (26).

6. The dual shielded layer magnetic sensor of claim 5, wherein: The inside of the horizontal grooves (24) is provided with sliding grooves (27) on the upper surface, the inside of the sliding grooves (27) is slidably connected with extrusion plates (28), the inside of the horizontal grooves (24) is provided with a plurality of inner sliding holes (29), the inside of the inner sliding holes (29) is slidably connected with sliding columns (30), and the rear surface of the extrusion plates (28) is fixedly connected with the front end of the sliding columns (30).

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