A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference

Abstract

The application discloses a high-sensitivity cylindrical proximity sensor with strong anti-electromagnetic interference, which comprises a guide rail, a sliding block, a mounting plate, a mounting hole and a limiting mechanism, the sliding block is arranged on the guide rail, the mounting plate is arranged on the sliding block, the mounting hole is arranged in the middle of the mounting plate, and the limiting mechanism is arranged on the mounting plate; the limiting mechanism comprises a proximity sensor, an outer ring, a top clamp, a damper I, a spring I, a bottom clamp, a damper II, a spring II, an anti-skid pad, an anti-skid convex, a front through hole, a rear through hole, a pressing rod, a supporting block, a finger pressing plate, a spring III, a magnetic plate I and a magnetic plate II. The scheme solves the fixing defects of traditional sensors through the synergistic effect of the multiple limiting damping disassembly structure, and takes into account the installation stability, convenient disassembly and assembly and the adaptability to complex electromagnetic vibration working conditions.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, specifically to a high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference. Background Technology

[0002] Currently, high-sensitivity cylindrical proximity sensors with strong electromagnetic suppression capabilities are widely used in industrial automation scenarios. The device uses an integrated cylindrical metal shell as a carrier, and carries an induction coil and multi-layer electromagnetic shielding components to complete non-contact position detection of metal workpieces. During the assembly stage, it is clamped and fixed to the equipment frame, tooling plate and aluminum profile support with the help of matching locking nuts. It is suitable for various automated working conditions such as machine tool positioning, assembly line sorting, robotic arm grasping and pneumatic stroke detection. It can stably capture the displacement signal of small metal components in complex electromagnetic environments where motors, welding machines and frequency conversion equipment coexist. The standardized cylindrical shape can meet the general assembly needs of various automated equipment.

[0003] Existing high-sensitivity cylindrical proximity sensors resistant to strong electromagnetic interference have smooth external threads throughout and are fixed only by a double-nut axial clamping bracket. The double nuts only restrict axial movement and do not provide hard limit constraints on circumferential rotation. Under continuous vibration conditions, the thread backlash, cable dragging, and torsional torque generated by the lateral impact of the workpiece can disrupt the static friction of the thread pair, causing the sensor to slowly rotate, resulting in sensor end face offset, inaccurate detection, and twisting of the tail cable, leading to faults such as cracking of the seal at the cable root and breakage of the inner wire.

[0004] Therefore, a solution is needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference, thereby solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference includes a guide rail, a slider, a mounting plate, a mounting hole, and a limiting mechanism. The slider is disposed on the guide rail, the mounting plate is disposed on the slider, the mounting hole is disposed in the middle of the mounting plate, and the limiting mechanism is disposed on the mounting plate. The limiting mechanism includes a proximity sensor, an outer ring, a top clamp, a damper one, a spring one, a bottom clamp, a damper two, a spring two, an anti-slip pad, an anti-slip protrusion, a front through hole, a rear through hole, a pressure rod, a support block, a pressure plate, a spring three, a magnetic plate one, and a magnetic plate two. The proximity sensor is disposed inside the mounting hole. The outer ring is disposed on the proximity sensor in opposite directions. The top clamp and the bottom clamp are disposed on the proximity sensor, one above the other, and both the top clamp and the bottom clamp are located inside the outer ring. The damper one is disposed on the top of the top clamp and connected to the inner wall of the outer ring. The spring one is disposed around the damper one. The damper two is disposed on the bottom of the bottom clamp and connected to the outer ring. The inner wall of the ring is connected, the second spring wraps around the second damper, the anti-slip pad is set on the inner wall of the top clamp and the bottom clamp, the anti-slip protrusions are evenly set on the surface of each anti-slip pad, the front through hole and the rear through hole are oppositely set through the front and rear ends of the outer ring, the pressure rod is respectively set inside the front through hole and the rear through hole, the spreading block is set on the inner end of each pressure rod, the acupressure plate is set on the outer end of each pressure rod, the third spring wraps around each pressure rod and is set on the inner side of each acupressure plate, the first magnetic plate is oppositely set on the left and right ends of the mounting plate, the second magnetic plate is respectively set on the opposite surface of the outer ring on the left and right sides, and the second magnetic plate is connected to the first magnetic plate.

[0007] Preferably, the outer wall of the proximity sensor is smooth throughout, the top clamp and the bottom clamp are both arc-shaped and the inner end arc of the top clamp and the bottom clamp fits the outer wall of the proximity sensor, and the width of the top clamp and the bottom clamp is the same as the width of the outer ring.

[0008] Preferably, the anti-slip pad adopts an embedded design and is embedded in the inner ends of the top clamp and the bottom clamp. The inner end of the anti-slip pad is parallel to the inner ends of the top clamp and the bottom clamp. The anti-slip protrusions are circular in structure and are equidistantly distributed circumferentially from left to right on each anti-slip pad.

[0009] Preferably, a small gap is left between the top clamp and the bottom clamp, and the outer ends of the two opposite sides of the top clamp and the bottom clamp are designed with a buffer slope so that the top clamp and the bottom clamp can be opened more easily when the spreading block moves into the gap. Preferably, the pressure rod is cylindrical, the support block is an isosceles trapezoid with a rounded corner at the end away from the adjacent pressure rod, the acupressure plate is arc-shaped, the width of the support block and the acupressure plate is the same as the width of the outer ring, and the pressure rod, the support block and the acupressure plate are integrally formed.

[0010] Preferably, the first magnetic plate has a ring structure, the circumference of the first magnetic plate is greater than the circumference of the mounting hole, and the shape and size of the second magnetic plate are the same as those of the first magnetic plate.

[0011] This invention provides a high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference. It offers the following advantages: 1. The top clamp and bottom clamp, together with the anti-slip pad, anti-slip protrusion, damper one, spring one, damper two, and spring two, form a circumferential anti-rotation clamping structure, which completely solves the problem of sensor deflection failure under vibration conditions.

[0012] 2. The acupressure plate, pressure rod, support block, and spring together form a manual operation mechanism, which can quickly complete the disassembly and assembly and position adjustment of the proximity sensor without the need for auxiliary tools.

[0013] 3. Magnetic plate one and magnetic plate two work together with the outer rings on the left and right sides to form a double limit of "internal friction clamping + external magnetic attraction locking", which enhances the overall assembly's ability to resist displacement.

[0014] 4. The guide rail, slider, mounting plate, and mounting holes work together to enable flexible adjustment of the limit mechanism's position, adapting to the installation needs of different automated equipment.

[0015] 5. The clamping structure of this solution is compatible with proximity sensors with smooth outer walls, and is compatible with their resistance to strong electromagnetic interference and high sensitivity detection performance, making it suitable for complex electromagnetic industrial environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of the proximity sensor of the present invention; Figure 2 This invention is based on Figure 1 A schematic diagram of the structure for removing the limiting mechanism; Figure 3 This is a schematic diagram of the limiting mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of all components of the limiting mechanism of the present invention, except for the proximity sensor; Figure 5 This invention is based on Figure 4 A structural schematic diagram showing the front and rear through holes; Figure 6 This is a schematic diagram of the structure of the pressure bar and its adjacent components of the present invention.

[0017] In the diagram: 1-Guide rail; 2-Slider; 3-Mounting plate; 4-Mounting hole; 5-Limiting mechanism; 51-Proximity sensor; 52-Outer ring; 53-Top clamp; 54-Damper one; 55-Spring one; 56-Bottom clamp; 57-Damper two; 58-Spring two; 59-Anti-slip pad; 510-Anti-slip protrusion; 511-Front through hole; 512-Rear through hole; 513-Pressure rod; 514-Spreading block; 515-Acupressure plate; 516-Spring three; 517-Magnetic plate one; 518-Magnetic plate two. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-6 The present invention provides a technical solution to achieve this: including a guide rail 1, a slider 2, a mounting plate 3, a mounting hole 4, and a limiting mechanism 5. The slider 2 is disposed on the guide rail 1, the mounting plate 3 is disposed on the slider 2, the mounting hole 4 is disposed in the middle of the mounting plate 3, and the limiting mechanism 5 is disposed on the mounting plate 3.

[0021] The limiting mechanism 5 includes a proximity sensor 51, an outer ring 52, a top clamp 53, a damper 54, a spring 55, a bottom clamp 56, a damper 57, a spring 58, an anti-slip pad 59, an anti-slip protrusion 510, a front through hole 511, a rear through hole 512, a pressure rod 513, a support block 514, a pressure plate 515, a spring 516, a magnetic plate 517, and a magnetic plate 518. The proximity sensor 51 is installed inside the mounting hole 4. The outer ring 52 is positioned on the proximity sensor 51, with the two rings on either side of it. The top clamp 53 and the bottom clamp 56 are positioned one above and one below the proximity sensor 51, and both the top clamp 53 and the bottom clamp 56 are located inside the outer ring 52. The damper 54 is positioned on top of the top clamp 53 and connected to the inner wall of the outer ring 52. The spring 55 is positioned around the damper 54. The damper 57 is positioned on the top of the outer ring 52. The bottom of the bottom clamp 56 is connected to the inner wall of the outer ring 52. Spring 2 58 is set to wrap around damper 2 57. Anti-slip pad 59 is set on the inner wall of the top clamp 53 and the bottom clamp 56. Anti-slip protrusions 510 are evenly set on the surface of each anti-slip pad 59. The front through hole 511 and the rear through hole 512 are set opposite to each other at the front and rear ends of the outer ring 52. The pressure rod 513 is set inside the front through hole 511 and the rear through hole 512 respectively. The spreading block 514 is set on the inner end of each pressure rod 513. The acupressure plate 515 is set on the outer end of each pressure rod 513. Spring 3 516 wraps around each pressure rod 513 and is set on the inner side of each acupressure plate 515. Magnetic plate 1 517 is set opposite to each other at the left and right ends of the mounting plate 3. Magnetic plate 2 518 is set on the opposite side of the outer ring 52 on the left and right sides respectively. Magnetic plate 2 518 is connected to magnetic plate 1 517.

[0022] In detail, the outer wall of the proximity sensor 51 is smooth, the top clamp 53 and the bottom clamp 56 are both arc-shaped, and the inner curvature of the top clamp 53 and the bottom clamp 56 matches the outer wall of the proximity sensor 51. The width of the top clamp 53 and the bottom clamp 56 is the same as the width of the outer ring 52.

[0023] The anti-slip mat 59 adopts an embedded design and is embedded in the inner ends of the top clamp 53 and the bottom clamp 56. The inner end of the anti-slip mat 59 is parallel to the inner end of the top clamp 53 and the inner end of the bottom clamp 56. The anti-slip protrusions 510 are circular in structure and are equidistantly distributed from left to right on each anti-slip mat 59.

[0024] A small gap is left between the top clamp 53 and the bottom clamp 56. The outer ends of the two opposite sides of the top clamp 53 and the bottom clamp 56 are designed with a buffer slope so that the top clamp 53 and the bottom clamp 56 can be opened more easily when the opening block 514 moves into the gap.

[0025] The pressure bar 513 has a cylindrical structure, the support block 514 has an isosceles trapezoidal structure, and the end of the support block 514 away from the adjacent pressure bar 513 has a rounded corner structure. The acupressure plate 515 has an arc-shaped structure. The width of the support block 514 and the acupressure plate 515 is the same as the width of the outer ring 52. The pressure bar 513, the support block 514 and the acupressure plate 515 are integrally formed.

[0026] Magnetic plate 517 has a ring structure and its circumference is greater than that of mounting hole 4. Magnetic plate 518 has the same shape and size as magnetic plate 517.

[0027] Solution Analysis: I. Stable anti-rotation positioning, completely solving the problem of vibration deflection failure in existing sensors. 1. The top clamp 53 and the bottom clamp 56 are arc-shaped structures, and the curvature of the inner wall completely matches the smooth outer wall of the proximity sensor 51. The two work together to form a ring-shaped clamping structure, which is different from the traditional double nut mode that only limits the axial movement. It can directly constrain the rotation of the proximity sensor 51 from the circumferential direction. A gap is reserved between the top clamp 53 and the bottom clamp 56, and a buffer slope is set on the mating end face. With the help of the support block 514, it can open and close smoothly without affecting the clamping and holding effect.

[0028] The anti-slip pad 59 is embedded and fixed to the inner wall of the top clamp 53 and the bottom clamp 56. The surface of the anti-slip pad 59 has circular anti-slip protrusions 510 evenly distributed around its circumference. When clamped, the anti-slip protrusions 510 tightly press against the outer wall of the proximity sensor 51, greatly increasing the static friction of the contact surface. When the equipment is continuously vibrating, the cable is being dragged, or the workpiece is being impacted from the side, generating a torsional torque, the high-strength friction prevents the proximity sensor 51 from slowly rotating, avoiding the displacement of the sensing end face and causing inaccurate detection. At the same time, it prevents the tail cable from twisting and prevents the seal at the cable root from cracking or the inner wire from breaking.

[0029] 2. The damper 1 54 and the spring 1 55, and the damper 2 57 and the spring 2 58 work together. The dampers 1 54 and 2 57 are miniature hydraulic dampers. On the one hand, they can continuously output a stable elastic clamping force after the pressure plate 515 is released, ensuring that the top clamp 53 and the bottom clamp 56 are in long-term contact with and clamp the proximity sensor 51. On the other hand, the hydraulic damping structure can absorb the vibration and impact energy under industrial conditions, buffer and offset the torsional force transmitted to the proximity sensor 51, further reduce the risk of rotation, and improve the vibration resistance and durability of the clamping structure.

[0030] II. Easy to assemble and disassemble, no auxiliary tools required, sensor position can be quickly adjusted by hand. 1. The acupressure plate 515, pressure rod 513, and support block 514 are integrally formed, and the width of the three is consistent with the width of the outer ring 52. The acupressure plate 515 has an arc-shaped structure that fits the fingers. The operator only needs to apply a little force with the thumb and index finger to press the acupressure plate 515, which can push the pressure rod 513 to slide inward along the front through hole 511 and the rear through hole 512. This causes the isosceles trapezoidal support block 514 with rounded corners at the ends to squeeze the slope end face between the top clamp 53 and the bottom clamp 56, easily opening the upper and lower clamps without the need for wrenches, nuts, or other assembly tools.

[0031] 2. Spring 3 516 is wrapped around the outside of pressure rod 513 and set inside acupressure plate 515. When acupressure plate 515 is pressed, spring 3 516 is compressed and stores energy. After releasing acupressure plate 515, spring 3 516 automatically pushes pressure rod 513 and expansion block 514 to reset, releasing the expansion effect on top clamp 53 and bottom clamp 56. In conjunction with damper 1 54, spring 1 55, damper 2 57 and spring 2 58, it automatically completes the clamping action. Sensor insertion, position fine adjustment and disassembly can be done by hand, which greatly improves the efficiency of tooling debugging and equipment maintenance.

[0032] III. Magnetic double locking enhances the overall assembly structure's resistance to displacement. 1. Magnetic plate 517 is a ring structure set at the left and right ends of the mounting plate 3. Magnetic plate 518 is matched and set on the opposite side of the outer ring 52 on the left and right sides. The shape and size of magnetic plate 517 and magnetic plate 518 are completely compatible. After the proximity sensor 51 is clamped and fixed by the outer ring 52 on one side, the outer ring 52 can be quickly magnetically attracted and connected to magnetic plate 517 through magnetic plate 518, so that the outer ring 52 is limited and attached to the end face of the mounting plate 3.

[0033] 2. The two sets of outer rings 52 are fixed to the two sides of the mounting plate 3 by magnetic assemblies, forming a two-way clamping limit for the proximity sensor 51. On the one hand, it restricts the outer ring 52 from deflecting or sliding relative to the mounting plate 3. On the other hand, it works with the inner top clamp 53 and bottom clamp 56 to form a double limiting structure of "internal friction clamping + external magnetic locking". Under strong vibration and automated working conditions, it further improves the stability of the installation position of the entire proximity sensor 51.

[0034] IV. The overall mounting base assembly is highly adaptable and allows for flexible workstation adjustment. The guide rail 1 and the slider 2 cooperate with each other. The slider 2 can slide freely along the guide rail 1. The mounting plate 3 is fixedly installed on the slider 2. The entire limiting mechanism 5 synchronously adjusts the front and rear positions of the workstation with the mounting plate 3, which is suitable for the installation space requirements of different automated equipment such as machine tools, production lines, and robotic arms. The mounting plate 3 has a mounting hole 4 in the middle, which provides through assembly space for the proximity sensor 51 and the outer ring 52. The structure is compact and regular, and is suitable for standardized automated racks and aluminum profile bracket assembly scenarios.

[0035] V. Compatible with sensors on smooth outer walls and compatible with sensor bodies resistant to strong electromagnetic interference. The clamping structure of this solution is specifically designed for proximity sensors 51 with smooth outer walls. It does not rely on the external thread structure of traditional sensors and can be directly adapted to high-sensitivity cylindrical proximity sensors 51 with integrated metal housings and built-in multi-layer electromagnetic shielding components. It retains the sensor's basic performance of resisting strong electromagnetic interference and high-precision detection of small metal components. It can be stably applied in complex electromagnetic industrial environments where motors, welding machines, and frequency converters coexist without weakening the sensor's detection sensitivity and electromagnetic suppression capabilities.

[0036] Working principle: During installation, begin with the right side. Hold the outer ring 52 and press down on the two pressure plates 515 with your thumb and forefinger. This will simultaneously push the pressure rod 513 and the support block 514 inward. The two support blocks 514 will then push the top clamp 53 and the bottom clamp 56 open in the up and down directions respectively, causing the damper 1 54, spring 1 55, damper 2 57, and spring 2 58 to bear the pressure. While maintaining the pressure, pass the proximity sensor 51 between the top clamp 53 and the bottom clamp 56. Once it reaches the desired position, release your grip. The anti-slip pad 59, in conjunction with the anti-slip protrusion 510, will firmly secure the proximity sensor 51. Then, pass the proximity sensor 51 through the mounting hole 4 so that the magnetic plate 2 518 on the outer ring 52 on the right side aligns and adheres to the magnetic plate 1 517 on the right end of the mounting plate 3. Similarly, the left outer ring 52, including its components, is then mounted on the proximity sensor 51 in the manner described above, ensuring that the second magnetic plate 518 on the left outer ring 52 aligns and adheres to the first magnetic plate 517 on the left end of the mounting plate 3, thus completing the final installation. The clamping and magnetic attraction mechanisms continuously limit the displacement of the proximity sensor 51 under continuous vibration, resulting in a more stable installation.

[0037] In addition, both damper 1 54 and damper 2 57 are miniature hydraulic dampers. By applying a little force with two fingers to press the acupressure plate 515, the top clamp 53 and the bottom clamp 56 can be opened. In the relaxed state, the proximity sensor 51 can be firmly fixed by the top clamp 53 and the bottom clamp 56.

[0038] Technical effects of implementing this solution: This solution, through the combined use of a ring-shaped anti-slip clamp, a hydraulic damping vibration reduction structure, a manual pressing quick-release mechanism, and a double-sided magnetic double-limiting structure, fundamentally solves the core defects of traditional threaded nut fixing methods, such as easy self-rotation, vibration condition detection failure, and cable damage. It also simplifies the sensor assembly, debugging, and disassembly process, while being compatible with smooth cylindrical proximity sensors with strong electromagnetic suppression capabilities. The overall structure's vibration resistance, installation stability, working condition adaptability, and maintenance convenience are all comprehensively improved, enabling long-term stable adaptation to various complex vibration and strong electromagnetic automated production scenarios.

[0039] The components of this invention are: 1-guide rail; 2-slider; 3-mounting plate; 4-mounting hole; 5-limiting mechanism; 51-proximity sensor; 52-outer ring; 53-top clamp; 54-damper one; 55-spring one; 56-bottom clamp; 57-damper two; 58-spring two; 59-anti-slip pad; 510-anti-slip protrusion; 511-front through hole; 512-rear through hole; 513-pressure rod; 514-spreading block; 515-finger pressure plate; 516-spring three; 517-magnetic plate one; 518-magnetic plate two. These components are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problem solved by this invention is that the existing high-sensitivity cylindrical proximity sensor with strong electromagnetic interference has a smooth external thread throughout and is fixed only by a double nut axial clamping bracket. Double nuts only restrict axial movement, without hard-limiting constraints on circumferential rotation. Under continuous vibration conditions, the torsional torque generated by thread backlash, cable dragging, and lateral impact from the workpiece can disrupt the static friction of the threaded pair, causing the sensor to slowly rotate, resulting in sensor end face misalignment, inaccurate detection, and twisting of the tail cable, leading to faults such as cracking of the lead-out seal and breakage of the inner wire. This invention solves the defects of traditional sensor fixing through the synergistic effect of multiple limiting and vibration-damping disassembly and assembly structures, taking into account stable installation, convenient disassembly and assembly, and adaptability to complex electromagnetic vibration conditions.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference, characterized in that: It includes a guide rail (1), a slider (2), a mounting plate (3), a mounting hole (4), and a limiting mechanism (5). The slider (2) is disposed on the guide rail (1), the mounting plate (3) is disposed on the slider (2), the mounting hole (4) is disposed in the middle of the mounting plate (3), and the limiting mechanism (5) is disposed on the mounting plate (3). The limiting mechanism (5) includes a proximity sensor (51), an outer ring (52), a top clamp (53), a damper one (54), a spring one (55), a bottom clamp (56), a damper two (57), a spring two (58), an anti-slip pad (59), an anti-slip protrusion (510), a front through hole (511), a rear through hole (512), a pressure rod (513), a spreading block (514), a pressure plate (515), a spring three (516), a magnetic plate one (517), and a magnetic plate two (518). The proximity sensor (51) is disposed in the mounting hole ( Inside the outer ring (52), the outer ring (52) is arranged opposite each other on the left and right sides to wrap around the proximity sensor (51). The top clamp (53) and the bottom clamp (56) are arranged one above and one below the proximity sensor (51), and both the top clamp (53) and the bottom clamp (56) are located inside the outer ring (52). The first damper (54) is arranged on the top of the top clamp (53) and connected to the inner wall of the outer ring (52). The first spring (55) wraps around the first damper (54). The second damper (57) is arranged on the bottom clamp. The bottom of the hoop (56) is connected to the inner wall of the outer ring (52). The second spring (58) wraps around the second damper (57). The anti-slip pad (59) is disposed on the inner wall of the top hoop (53) and the bottom hoop (56). The anti-slip protrusions (510) are evenly disposed on the surface of each anti-slip pad (59). The front through hole (511) and the rear through hole (512) are oppositely disposed at the front and rear ends of the outer ring (52). The pressure rod (513) is disposed in the inner walls of the front through hole (511) and the rear through hole (512). The expansion block (514) is disposed at the inner end of each pressure rod (513), the acupressure plate (515) is disposed at the outer end of each pressure rod (513), the spring three (516) wraps around each pressure rod (513) and is disposed on the inner side of each acupressure plate (515), the magnetic plate one (517) is disposed opposite to each other at the left and right ends of the mounting plate (3), the magnetic plate two (518) is disposed on the opposite surfaces of the outer ring (52) on the left and right sides respectively, and the magnetic plate two (518) is connected to the magnetic plate one (517).

2. The high-sensitivity cylindrical proximity sensor with strong electromagnetic interference resistance according to claim 1, characterized in that: The outer wall of the proximity sensor (51) is smooth. The top clamp (53) and bottom clamp (56) are both arc-shaped and the inner end arc of the top clamp (53) and bottom clamp (56) fits the outer wall of the proximity sensor (51). The width of the top clamp (53) and bottom clamp (56) is the same as the width of the outer ring (52).

3. A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference according to claim 2, characterized in that: The anti-slip pad (59) is embedded in the inner end of the top clamp (53) and the bottom clamp (56) with an embedded design. The inner end of the anti-slip pad (59) is parallel to the inner end of the top clamp (53) and the inner end of the bottom clamp (56). The anti-slip protrusion (510) is circular and is equidistantly distributed from left to right on each anti-slip pad (59).

4. A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference according to claim 3, characterized in that: A small gap is left between the top clamp (53) and the bottom clamp (56). The outer ends of the two opposite sides of the top clamp (53) and the bottom clamp (56) are designed with a buffer slope so that the opening block (514) can more easily open the top clamp (53) and the bottom clamp (56) when it moves into the gap.

5. A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference according to claim 4, characterized in that: The pressure bar (513) has a cylindrical structure, the support block (514) has an isosceles trapezoidal structure and the end of the support block (514) away from the adjacent pressure bar (513) has a rounded corner structure, the acupressure plate (515) has an arc-shaped structure, the width of the support block (514) and the acupressure plate (515) is the same as the width of the outer ring (52), and the pressure bar (513), the support block (514) and the acupressure plate (515) are integrally formed.

6. A high-sensitivity cylindrical proximity sensor resistant to strong electromagnetic interference according to claim 5, characterized in that: The first magnetic plate (517) has a ring structure, and the circumference of the first magnetic plate (517) is greater than the circumference of the mounting hole (4). The shape and size of the second magnetic plate (518) are the same as those of the first magnetic plate (517).

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