High-fault-tolerance magnetic induction sensor and application method thereof

Abstract

The invention relates to the technical field of magnetic induction sensor equipment, in particular to a high-fault-tolerance magnetic induction sensor and an application method thereof. The spiral spring is matched with the semicircular hollow induction ball structure, the characteristics of the spiral spring and the shape characteristics of the semicircular hollow ball are ingeniously utilized, a detected object with an unstable movement position can be effectively detected, the induction distance is large, and damage is not likely to happen in the collision process; the method is high in adaptability, can realize high fault tolerance of motion deviation of a detected object, can normally work in working conditions such as motion track deformation, mechanical connection loosening, motion shaft shaking, internal leakage or tripping of a hydraulic cylinder and the like, can be used for detecting the negative distance with the detected object, and is wide in application scene; the magnetic induction sensor detection device can effectively reduce the occurrence of missing detection, collision and the like of the magnetic induction sensor in the actual production process, can greatly improve the production efficiency, and is low in manufacturing cost, convenient to use and maintain and easy to popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic induction sensor devices, and particularly to a highly fault-tolerant magnetic induction sensor and an application method thereof, which are mainly applicable to detection occasions where the measured object has large jitter or the moving position of the object drifts each time. Background Art

[0002] At present, various magnetic induction sensor devices applied in industry are mainly used to emit induction signals when a ferromagnetic metal object approaches. Due to their mature technology and stable performance, they are widely used. However, traditional magnetic induction sensors also have the following defects: 1. Short induction distance: The distance between the inductor and the detected ferromagnetic metal object generally needs to be less than 20 mm. When the induction distance is too large, undetected cases will occur; individual special magnetic induction sensors can achieve a larger distance, but they must be used in conjunction with special induction magnets.

[0003] 2. Prone to damage when colliding: When the magnetic induction sensor collides with the moving object being detected, the magnetic induction sensor will be damaged.

[0004] 3. Only applicable to occasions where the moving trajectory of the detected object is stable: When the moving trajectory of the detected object is unstable and the deviation of the moving trajectory is too large, it will be difficult for the magnetic induction sensor to detect the position of the object.

[0005] In the actual production process, due to the influence of the production environment and on-site conditions, when the object to be detected is affected by vibration sources, large temperature differences in the working environment, loose key connection parts, etc., the detected object will show phenomena such as jitter, trajectory deviation, and non-fixed reciprocating movement position, resulting in the traditional magnetic induction sensor either facing the risk of being damaged by collision or possibly being unable to sense due to too far a distance, making it difficult to apply; especially in the steel industry, the on-site conditions are relatively more severe, and the related problems encountered are more obvious. Action deviations caused by phenomena such as oil cylinder tripping, track deformation, and unstable air pressure will all lead to consequences such as undetected magnetic induction sensors or even being damaged by collision, ultimately resulting in various equipment accidents such as production slowdown and shutdown.

[0006] The prior art usually adopts a scheme of keeping as far away from the detected object as possible, replacing it with a laser ranging device to measure the object distance, and using the distance value to judge the object position, or using methods such as infrared transceiver devices, ultrasonic detection, and radar detection; however, all of the above means are technically complex and costly. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: to provide a highly fault-tolerant magnetic induction sensor and an application method thereof, which can effectively detect a measured object with an unstable moving position, have a large induction distance, are not easily damaged when colliding, have a low manufacturing cost, are convenient to maintain, and are easy to promote.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is as follows: I. A highly fault-tolerant magnetic induction sensor The present invention provides a highly fault-tolerant magnetic induction sensor, which includes an induction part and a body part. The induction part is composed of a mounting base plate 1, a spiral spring 2, and a hemispherical hollow induction ball 3. The mounting base plate 1 is fixedly installed on the object to be detected 7 by bolt connection. One end of the spiral spring 2 is fixedly connected to the bottom of the mounting base plate 1, and the other end is fixedly connected to a hemispherical hollow induction ball 3. The body part is composed of a guiding housing 4 and a cylindrical sensor body 5. The guiding housing 4 is installed on the top of the cylindrical sensor body 5 by threaded connection, and the cylindrical sensor body 5 is fixedly connected to a sensor fixing frame 8 below.

[0009] Furthermore, both the hemispherical hollow induction ball 3 and the spiral spring 2 are made of ferromagnetic materials and can be detected by the sensor body 5 when they enter the preset range of the cylindrical sensor body 5.

[0010] Furthermore, the initial length of the spiral spring 2 is calculated and determined according to the detection range of the sensor body 5 and the movement position offset law of the object to be detected 7 within the preset production cycle.

[0011] Furthermore, the specific shape of the hemispherical hollow induction ball 3 is three-quarters of a closed spherical shape. The interior of the spherical shape is hollow, the lower half cross-section is a plane, and the size of the hemispherical hollow induction ball 3 is adapted to the size of the guiding housing 4.

[0012] Furthermore, the guiding housing 4 is composed of an upper arc-shaped guiding guard plate 41 and a lower circular ring sleeve 42. The upper arc-shaped guiding guard plate 41 is fixedly connected to the top of the lower circular ring sleeve 42, and both the upper arc-shaped guiding guard plate 41 and the lower circular ring sleeve 42 are made of non-ferromagnetic materials.

[0013] Furthermore, the middle part of the upper arc-shaped guiding guard plate 41 is a semi-circular ring structure, and arc-shaped guard plates that expand outward are connected to both sides of the semi-circular ring structure for guiding the induction ball.

[0014] Furthermore, an internal thread 43 of the circular ring sleeve is provided on the inner wall of the lower circular ring sleeve 42, and the internal thread 43 of the circular ring sleeve is adapted to the external thread 6 provided on the outer wall of the cylindrical sensor body 5. The installation height of the guiding housing 4 on the top of the sensor body 5 can be adjusted by the cooperation of the internal thread 43 of the circular ring sleeve and the external thread 6 of the sensor body.

[0015] Furthermore, the lower part of the cylindrical sensor body 5 is installed in a threaded hole opened in the middle of the sensor fixing frame 8 by threaded connection.

[0016] II. Application method of a highly fault-tolerant magnetic induction sensor Based on the same inventive concept, the present invention also provides an application method of the above-mentioned highly fault-tolerant magnetic induction sensor, which specifically includes the following steps: S1. When the object to be detected moves vertically: S11. According to the maximum detection distance of the sensor and the variation law of the offset value of the vertical movement trajectory of the object to be detected within the preset production cycle, calculate and determine the initial length and the limit compression length of the sensor's helical spring; Wherein, the initial length L of the sensor's helical spring 1 ≥ H 1 +B 1 - T, and the limit compression length X of the sensor's helical spring ≤ L 1 -F 1 ; In the formula, T is the maximum detection distance of the sensor, H 1 is the distance between the end point of the standard vertical movement trajectory of the object to be detected and the sensor fixing bracket, F 1 and B 1 are respectively the maximum positive offset value and the maximum negative offset value of the vertical movement trajectory of the object to be detected within the preset production cycle, and both are obtained through multiple experimental measurements; S12. Install the sensing part of the sensor at the top end of the object to be detected in the vertical movement direction, and install the body part of the sensor at the end point of the standard vertical movement trajectory of the object to be detected. And when the object to be detected is at the end point of the standard vertical movement trajectory, the sensing ball just contacts the guiding housing; S13. When the vertical movement trajectory of the object to be detected has a negative offset, causing the distance between the trajectory end point and the sensor body to increase, the sensor detects the signal of the sensing ball connected by the helical spring within the detection range to achieve effective detection of the object to be detected; S14. When the vertical movement trajectory of the object to be detected has a positive offset, causing the distance between the trajectory end point and the sensor body to decrease, the helical spring is compressed to offset the impact force between the sensing ball and the sensor body to achieve normal detection of the object to be detected; S2. When the object to be detected moves horizontally: S21. According to the maximum detection distance of the sensor and the variation law of the offset value of the horizontal movement trajectory of the object to be detected within the preset production cycle, calculate and determine the initial length and the limit stretching length of the sensor's helical spring; Wherein, the initial length L of the sensor's helical spring 2 ≥ H 2 +F 2 - T, and the limit stretching length Y of the sensor's helical spring ≥ B2 ; Wherein, H 2 is the distance between the end point of the standard horizontal movement trajectory of the object to be detected and the sensor fixing bracket, and F 2 and B 2 are respectively the maximum upward offset and the maximum downward offset of the horizontal movement trajectory of the object to be detected within the preset production cycle, and both are obtained through multiple experimental measurements; S22: Install the sensing part of the sensor at the bottom end of the horizontal movement direction of the object to be detected, and install the body part of the sensor directly below the end point of the standard horizontal movement trajectory of the object to be detected. And when the object to be detected is at the end point of the standard horizontal movement trajectory, the sensing ball just contacts the guiding housing; S23: When the horizontal movement trajectory of the object to be detected has an upward offset, causing the distance between the trajectory end point and the sensor body to increase, the sensor detects the signal of the sensing ball connected by the helical spring within the detection range to achieve effective detection of the object to be detected; S34: When the horizontal movement trajectory of the object to be detected has a downward offset, causing the trajectory end point to cross the sensor body, the sensing ball is guided by the arc-shaped guiding guard plate to cooperate with the bending and stretching of the helical spring, so that the sensing ball is guided to directly above the contact surface of the sensor body to achieve normal detection of the object to be detected.

[0017] The present invention has the following main advantages compared with the prior art: 1. The present invention adopts the combination of a helical spring and a semi-circular hollow sensing ball structure, skillfully utilizes the characteristics of the helical spring and the shape characteristics of the semi-circular hollow sphere, can effectively detect the object to be detected with unstable movement position, has a large sensing distance, and is not easily damaged during collision; 2. The present invention has strong adaptability, can achieve high fault tolerance for the movement offset of the object to be detected, and can work normally in working conditions such as deformed movement tracks, loose mechanical connections, jitter of movement axes, internal leakage or tripping of hydraulic cylinders, etc., and can be used for the detection of negative distances from the object to be detected, with a wide range of application scenarios; 3. The present invention can effectively reduce the occurrence of situations such as missed detection and damage of magnetic induction sensors during the actual production process, can greatly improve production efficiency, and has low manufacturing cost, convenient use and maintenance, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the magnetic induction sensor in the embodiment of the present invention; Figure 2 is a front view of the guiding housing in the embodiment of the present invention; Figure 3 is a top view of the guiding housing in the embodiment of the present invention; Figure 4Side view of the guiding housing in the embodiment of the present invention; Figure 5 Schematic diagram of the standard working condition of the vertical movement of the object to be measured in the embodiment of the present invention; Figure 6 Schematic diagram of the excessive displacement working condition of the vertical movement of the object to be measured in the embodiment of the present invention; Figure 7 Schematic diagram of the non-arrival working condition of the vertical movement of the object to be measured in the embodiment of the present invention; Figure 8 Schematic diagram of the standard working condition of the horizontal movement of the object to be measured in the embodiment of the present invention; Figure 9 Schematic diagram of the downward offset working condition of the horizontal movement of the object to be measured in the embodiment of the present invention; Figure 10 Schematic diagram of the upward offset working condition of the horizontal movement of the object to be measured in the embodiment of the present invention.

[0019] In the figure - 1 - mounting base plate; 2 - helical spring; 3 - hemispherical hollow induction ball; 4 - guiding housing; 5 - cylindrical sensor body; 6 - external thread of the sensor body; 7 - object to be detected; 8 - sensor fixing bracket; 41 - upper arc guiding guard plate (for guiding the induction ball); 42 - lower ring sleeve; 43 - internal thread of the ring sleeve (matched with the external thread of the sensor, used to adjust the installation height of the guiding housing). Detailed implementation manners

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] It should be noted that according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0022] Embodiment 1, this embodiment provides a high-fault-tolerant magnetic induction sensor, as Figures 1 - 4 shown, mainly including an induction part and a body part. The induction part is composed of a mounting base plate 1, a helical spring 2 and a hemispherical hollow induction ball 3. The mounting base plate 1 is fixedly installed on the object to be detected 7 by bolt connection. One end of the helical spring 2 is fixedly connected to the bottom of the mounting base plate 1, and the other end is fixedly connected with a hemispherical hollow induction ball 3; The main body part is composed of a guiding housing 4 and a cylindrical sensor body 5. The guiding housing 4 is installed at the top of the cylindrical sensor body 5 through threaded connection, and the lower part of the cylindrical sensor body 5 is fixedly connected to a sensor fixing frame 8.

[0023] Furthermore, both the hemispherical hollow induction ball 3 and the helical spring 2 are made of ferromagnetic materials and can be detected by the sensor body 5 when they enter the preset range of the cylindrical sensor body 5.

[0024] Furthermore, the initial length of the helical spring 2 is calculated and determined according to the detection range of the sensor body 5 and the movement position offset law of the detected object 7 within the preset production cycle.

[0025] Furthermore, the specific shape of the hemispherical hollow induction ball 3 is three - quarters of a closed spherical shape. The inside of the spherical shape is hollow, the lower half cross - section is a plane, and the size of the hemispherical hollow induction ball 3 is adapted to the size of the guiding housing 4.

[0026] Furthermore, the guiding housing 4 is composed of an upper arc - shaped guiding guard plate 41 and a lower circular ring sleeve 42. The upper arc - shaped guiding guard plate 41 is fixedly connected to the top of the lower circular ring sleeve 42, and both the upper arc - shaped guiding guard plate 41 and the lower circular ring sleeve 42 are made of non - ferromagnetic materials.

[0027] Furthermore, the middle part of the upper arc - shaped guiding guard plate 41 is a semi - circular ring structure, and arc - shaped guard plates that expand outwards are connected to both sides of the semi - circular ring structure for guiding the induction ball.

[0028] Furthermore, an internal thread 43 of the circular ring sleeve is provided on the inner wall of the lower circular ring sleeve 42, and the internal thread 43 of the circular ring sleeve is adapted to the external thread 6 of the sensor body provided on the outer wall of the cylindrical sensor body 5. By matching the internal thread 43 of the circular ring sleeve with the external thread 6 of the sensor body, the installation height of the guiding housing 4 on the top of the sensor body 5 can be adjusted.

[0029] Furthermore, the lower part of the cylindrical sensor body 5 is installed in a threaded hole opened in the middle of the sensor fixing frame 8 through threaded connection.

[0030] Embodiment 2: A highly fault - tolerant magnetic induction sensor provided in this embodiment. Above the induction part is a fixed bottom plate with four screw holes at the bottom and can be fixed with bolts. A cylindrical helical spring is welded on the bottom plate, and an induction ball is welded to the support ring at the lower part of the spring. The shape of the induction ball is three - quarters of a spherical shape, the sphere is hollow and closed, and the lower half cross - section is a plane. Both the sphere of the induction ball and the connecting spring are made of ferromagnetic materials. The main body part is cylindrical and engraved with threads on the outside, which is convenient for locking and fixing with nuts; the upper half of the main body is designed with a guiding housing. The lower part of the housing is circular, and the upper part is a semi-circular structure; there are two expanded arc-shaped guard plates at the upper end of the semi-circle, which are convenient for guiding the induction ball; there are threads inside the housing, which cooperate with the external threads of the main body and can be fixed on the cylindrical main body to freely adjust the position; the material of the guiding housing is non-ferromagnetic, and it is plastic, rubber or composite material with a certain strength.

[0031] Working principle: 1) Vertical movement of the object to be detected: The induction part of the magnetic induction sensor is installed at the top of the object to be detected, and the main body part is installed at the end of the movement track of the object to be detected. The installation position should be such that when the object to be detected moves to the end of the movement track, the induction ball can just contact the main body of the magnetic induction sensor.

[0032] When the object to be detected moves reciprocally in the vertical direction, when it just touches the magnetic induction sensor, due to the principle of electromagnetic induction, the magnetic field emitted by the main body part detects the ferromagnetic induction ball and emits an induction signal. This is a normal situation, and at this time the spring does not move.

[0033] When the object to be detected is smaller than the original movement track due to various working conditions, and the induction ball is less than 20 mm away from the sensor main body, the magnetic field emitted by the main body part of the sensor can detect the ferromagnetic induction ball and emit an induction signal. This is also a normal situation and is the detection distance that a traditional magnetic induction sensor can reach.

[0034] When the object to be detected is larger than the original movement track due to various working conditions and the induction ball hits the sensor main body, the spiral spring on the induction ball compresses, and the impact force is consumed by the spring. The magnetic induction sensor is not damaged and can still be normally inductive. It can be seen that due to the action of the spiral spring, even when the distance between the two is negative (-x), it can still be normally detected. The value of x is the length that the spiral spring can compress.

[0035] 2) Horizontal movement of the object to be detected: When the object moves horizontally, the induction ball and the sensor main body are installed at either the left or right end. In the standard position, the two are as close as possible without touching. Taking the installation at the lower right end of the object to be detected as an example. When the object moves parallelly, it drives the induction ball to pass over the sensor induction surface, and at this time the sensor is normally inductive.

[0036] When the moving trajectory of the object to be detected is deflected below the horizontal line due to various working conditions, the sensing ball contacts the sensor body and the helical spring bends. As the object continues to move, since the contact surface of the sensing ball is an arc surface, and with the effect of the arc-shaped guard plate on the guiding housing of the sensor body, the sensing ball is guided above the contact surface of the sensor body. The sensor normally senses the movement of the object and sends out a sensing signal. When the moving object returns along the original path, the spring and the sensing ball automatically bounce back to their original positions.

[0037] When the moving trajectory of the object to be detected is deflected above the horizontal line due to various working conditions, the sensing ball does not contact the sensing surface of the sensor body. As long as the distance does not exceed 20 mm, due to the effect of electromagnetic induction, the sensor can still sense normally.

[0038] Embodiment 3, based on the same inventive concept, this embodiment also provides an application method of the high-fault-tolerant magnetic induction sensor as described above, specifically including the following steps: S1, when the object to be detected moves vertically: S11, according to the maximum detection distance of the sensor and the variation law of the offset value of the vertical movement trajectory of the object to be detected within the preset production cycle, calculate and determine the initial length and the limit compression length of the helical spring of the sensor; Among them, the initial length L of the helical spring of the sensor 1 ≥ H 1 + B 1 - T, the limit compression length X of the helical spring of the sensor ≤ L 1 - F 1 ; In the formula, T is the maximum detection distance of the sensor, H 1 is the distance between the end point of the standard vertical movement trajectory of the object to be detected and the sensor fixing bracket, F 1 and B 1 are respectively the maximum positive offset and the maximum negative offset of the vertical movement trajectory of the object to be detected within the preset production cycle, and both are obtained through multiple experimental measurements; S12, install the sensing part of the sensor at the top end of the vertical movement direction of the object to be detected, and install the body part of the sensor at the end point of the standard vertical movement trajectory of the object to be detected. And when the object to be detected is at the end point of the standard vertical movement trajectory, the sensing ball just contacts the guiding housing; S13, when the vertical movement trajectory of the object to be detected has a reverse offset, causing the distance between the trajectory end point and the sensor body to increase, the sensor detects the signal of the sensing ball connected by the helical spring within the detection range to achieve effective detection of the object to be detected; S14. When the vertical movement trajectory of the object to be detected has a positive offset, causing the distance between the trajectory end point and the sensor body to decrease, the spiral spring is compressed to offset the impact force between the induction ball and the sensor body, so as to realize the normal detection of the object to be detected; S2. When the object to be detected moves horizontally: S21. According to the maximum detection distance of the sensor and the variation law of the offset value of the horizontal movement trajectory of the object to be detected within the preset production cycle, calculate and determine the initial length and the limit tensile length of the sensor spiral spring; Among them, the initial length L of the sensor spiral spring 2 ≥ H 2 +F 2 - T, and the limit tensile length Y of the sensor spiral spring ≥ B 2 ; In the formula, H 2 is the distance between the end point of the horizontal movement standard trajectory of the object to be detected and the sensor fixing bracket, F 2 and B 2 are respectively the maximum upward offset and the maximum downward offset of the horizontal movement trajectory of the object to be detected within the preset production cycle, and both are obtained through multiple experimental measurements; S22. Install the induction part of the sensor at the bottom end of the horizontal movement direction of the object to be detected, and install the body part of the sensor directly below the end point of the horizontal movement standard trajectory of the object to be detected. And when the object to be detected is at the end point of the horizontal movement standard trajectory, the induction ball just touches the guiding housing; S23. When the horizontal movement trajectory of the object to be detected has an upward offset, causing the distance between the trajectory end point and the sensor body to increase, the sensor detects the signal of the induction ball connected by the spiral spring within the detection range to realize the effective detection of the object to be detected; S34. When the horizontal movement trajectory of the object to be detected has a downward offset, causing the trajectory end point to cross the sensor body, the arc-shaped guiding guard plate is used to guide the induction ball to cooperate with the bending and stretching of the spiral spring, so that the induction ball is guided to directly above the contact surface of the sensor body, so as to realize the normal detection of the object to be detected.

[0039] Specifically, when the object to be detected moves vertically: Condition 1: As Figure 5 shown, the object to be detected 7 moves to the standard position, the bottom of the induction ball 3 does not touch or just touches the sensor induction surface, the spring does not act, and the sensor induction is normal.

[0040] Condition 2: As Figure 6 shown, the object to be detected 7 moves with a positive offset, the induction ball 3 hits the sensor body induction surface, causing the spiral spring 2 to be compressed, eliminating the impact force, effectively protecting the sensor body, and the sensor induction is normal.

[0041] Working condition three: Figure 7 As shown, the detected object 7 moves in the reverse direction, and the sensing ball 3 connected by the spring is still within 20 mm from the sensing surface of the sensor, which is within the sensing range of the sensor, so that the sensor senses normally. The present invention effectively extends the sensing distance of the traditional magnetic induction sensor, and the extended distance is determined by the length characteristics of the coil spring.

[0042] Furthermore, when the object being measured moves horizontally: Working condition 1: If Figure 8 As shown, the trolley is moving normally to the right, the detected object 7 moves to the upper part of the guide housing 4, the sensing ball 3 is not in contact with the sensor body or is just in contact, and the sensor sensing is normal.

[0043] Working condition 2: If Figure 9 As shown, the trolley travels normally to the right. Due to the depression of the track, the trajectory of the detected object 7 deviates downward. When the end point of the trajectory passes the sensor body, the contact surface of the sensing ball is a smooth arc surface, and the guiding and blocking function of the guide shell is cooperated to guide the sensing ball to the sensing surface of the sensor body, and the spiral spring 2 bends and stretches, so that the sensor sensing is normal; after the trolley returns, the spring and the sensing ball return to their original positions.

[0044] Working condition three: Figure 10 As shown, the trolley is moving normally to the right. Due to the raised track, the trajectory of the detected object 7 is shifted upward. The sensing ball 3 connected by the spring is still within a distance of 20 mm from the sensing surface of the sensor, which is within the sensing range of the sensor, so that the sensor senses normally.

[0045] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0046] In summary: 1. The present invention adopts a spiral spring and a semicircular hollow sensing ball structure, which cleverly utilizes the characteristics of the spiral spring and the shape of the semicircular hollow sphere. It can effectively detect objects with vertical and horizontal movement deviations, and is easy to install, has a large sensing distance, and is not easily damaged in collisions; 2. The present invention has strong adaptability and can achieve high fault tolerance for the movement deviation of the measured object. It can work normally in working conditions such as deformation of the moving track, loose mechanical connection, shaking of the moving axis, leakage or tripping of the hydraulic cylinder, and can be used for the detection of negative distance to the measured object, with a wide range of application scenarios; 3. The present invention can effectively reduce the occurrence of missed detection and damage of magnetic induction sensors in the actual production process, greatly improve production efficiency, and has low production cost, convenient use and maintenance, and is easy to promote.

[0047] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high fault tolerance magnetic induction sensor, characterized in that: The device comprises a sensing part and a main body part, wherein the sensing part is composed of a mounting base plate (1), a coil spring (2) and a hemispherical hollow sensing ball (3), wherein the mounting base plate (1) is fixedly mounted on the object to be detected (7) by bolt connection, and one end of the coil spring (2) is fixedly connected to the bottom of the mounting base plate (1), and the other end is fixedly connected to the hemispherical hollow sensing ball (3); The main body portion is composed of a guide shell (4) and a cylindrical sensor body (5); the guide shell (4) is mounted on the top of the cylindrical sensor body (5) through a threaded connection, and the bottom of the cylindrical sensor body (5) is fixedly connected to a sensor fixing frame (8).

2. A high fault tolerance magnetic induction sensor according to claim 1, characterized in that: The hemispherical hollow sensing ball (3) and the spiral spring (2) are both made of ferromagnetic materials and can be detected by the sensor body (5) when they enter a preset range of the cylindrical sensor body (5).

3. A high fault tolerance magnetic induction sensor according to claim 2, characterized in that: The initial length of the coil spring (2) is calculated and determined based on the detection range of the sensor body (5) and the movement position deviation law of the detected object (7) within a preset production cycle.

4. A high fault tolerance magnetic induction sensor according to claim 3, characterized in that: The specific shape of the hemispherical hollow sensing ball (3) is a three-quarter closed sphere, the interior of the sphere is hollow, the lower half cross-section is a plane, and the size of the hemispherical hollow sensing ball (3) is compatible with the size of the guide shell (4).

5. The high fault tolerance magnetic induction sensor according to claim 1, characterized in that: The guide housing (4) is composed of an upper arc-shaped guide guard plate (41) and a lower circular ring sleeve (42); the upper arc-shaped guide guard plate (41) is fixedly connected to the top of the lower circular ring sleeve (42); and the upper arc-shaped guide guard plate (41) and the lower circular ring sleeve (42) are both made of non-ferromagnetic materials.

6. A high fault tolerance magnetic induction sensor according to claim 5, characterized in that: The middle part of the upper arc-shaped guide guard plate (41) is a semicircular ring structure, and arc-shaped guard plates extending outward are connected to both sides of the semicircular ring structure for guiding the sensing ball.

7. The high fault tolerance magnetic induction sensor according to claim 5, characterized in that: The inner wall of the lower annular sleeve (42) is provided with an annular sleeve internal thread (43), and the annular sleeve internal thread (43) is matched with the sensor body external thread (6) provided on the outer wall of the cylindrical sensor body (5); the installation height of the guide housing (4) on the top of the sensor body (5) can be adjusted by matching the annular sleeve internal thread (43) with the sensor body external thread (6).

8. The high fault tolerance magnetic induction sensor according to claim 7, characterized in that: The lower part of the cylindrical sensor body (5) is mounted in a threaded hole opened in the middle of the sensor fixing frame (8) through a threaded connection.

9. An application method of the high fault tolerance magnetic induction sensor according to any one of claims 1 to 8, characterized in that: The steps include: S1, when the detected object moves vertically: S11, calculating and determining the initial length and the limit compression length of the sensor coil spring according to the maximum detection distance of the sensor and the variation law of the offset value of the vertical motion trajectory of the detected object within a preset production cycle; S12, installing the sensing part of the sensor at the top of the end of the vertical motion direction of the detected object, and installing the body of the sensor at the end point of the vertical motion standard track of the detected object, and when the detected object is at the end point of the vertical motion standard track, the sensing ball just contacts the guide housing; S13, when the vertical motion trajectory of the detected object deviates in the reverse direction, so that the distance between the end point of the trajectory and the sensor body becomes larger, the sensor detects the induction ball signal connected to the spiral spring within the detection range to effectively detect the detected object; S14, when the vertical motion trajectory of the detected object deviates in the positive direction, so that the distance between the end point of the trajectory and the sensor body becomes smaller, the impact force between the sensing ball and the sensor body is offset by the compression of the spiral spring to achieve normal detection of the detected object; S2, when the detected object moves horizontally: S21, calculating and determining the initial length and the limit stretching length of the sensor coil spring according to the maximum detection distance of the sensor and the variation law of the offset value of the horizontal motion trajectory of the detected object within a preset production cycle; S22, installing the sensing part of the sensor at the bottom of the end of the horizontal motion direction of the detected object, and installing the body of the sensor just below the end point of the horizontal motion standard track of the detected object, and when the detected object is at the end point of the horizontal motion standard track, the sensing ball just contacts the guide housing; S23, when the horizontal motion trajectory of the detected object deviates upward, so that the distance between the end point of the trajectory and the sensor body becomes larger, the sensor detects the induction ball signal connected to the spiral spring within the detection range to achieve effective detection of the detected object; S34, when the horizontal motion trajectory of the detected object deviates downward and the end point of the trajectory passes over the sensor body, the arc-shaped guide guard plate guides the sensing ball and the bending and stretching of the spiral spring so that the sensing ball is guided to the top of the contact surface of the sensor body to achieve normal detection of the detected object.

10. The application method according to claim 9, characterized in that: When the detected object moves vertically, the initial length L1 of the sensor coil spring ≥ H1+B1-T, and the limit compression length X of the sensor coil spring ≤ L1-F1; Where, T is the maximum detection distance of the sensor, H1 is the distance between the end point of the vertical motion standard trajectory of the detected object and the sensor fixing frame, F1 and B1 are the maximum positive offset and maximum reverse offset of the vertical motion trajectory of the detected object within the preset production cycle, respectively, both of which are obtained through multiple experimental measurements; When the detected object moves horizontally, the initial length L2 of the sensor coil spring ≥ H2+F2- T, and the ultimate tensile length Y of the sensor coil spring ≥ B2; Where H2 is the distance between the end point of the standard horizontal motion trajectory of the detected object and the sensor fixing frame, F2 and B2 are the maximum upward deviation and the maximum downward deviation of the horizontal motion trajectory of the detected object within the preset production cycle, respectively, both of which are obtained through multiple experimental measurements.

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