A residual remanence detection method and detection device

Abstract

The application relates to a residual residual magnetism detection method and a detection device, and belongs to an automatic detection method and equipment. The residual residual magnetism detection method comprises the following steps: placing a detection sample on a conveying mechanism, conveying the detection sample to a detection mechanism through the conveying mechanism; under a zero magnetic environment, the detection mechanism detects the residual residual magnetization of the detection sample; after the detection is completed, the detection sample moves to a belt of a sorting mechanism; and according to the detection result of the detection mechanism, the detection sample is classified through the sorting mechanism. The detection method can detect the residual residual magnetization of parts in a production process and / or after processing is completed, can timely monitor and sort, and is high in detection efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of automated testing equipment, and more particularly to a method and apparatus for detecting residual magnetism. Background Technology

[0002] With the development of industrial technology, especially in the pursuit of high-quality and high-precision industrial production, low residual magnetism has become one of the important indicators of high-quality products. In the production of precision products such as gear parts, bearing parts, medical materials, and electronic components, there are strict limits on the residual magnetism of the workpiece.

[0003] Remanence refers to the phenomenon where, after a ferromagnetic material is magnetized, some magnetic domains retain their magnetized orientation and do not revert to their original random orientation even after the external magnetic field is removed. Remanence can be caused by various factors, including grinding, low-frequency heating, welding, magnetization of workpieces during magnetic particle testing, contact with strongly magnetic materials, and magnetization of rod-shaped materials by the Earth's magnetic field after impact or vibration.

[0004] The presence of residual magnetism can severely affect the further processing of ferromagnetic materials and the stability of precision equipment. Assembling components with excessively high residual magnetism can affect the accuracy and normal operation of precision circuits and instruments; during machining, excessively high residual magnetism can attract iron powder and shavings, reducing surface cleanliness and damaging cutting tools; during welding operations, excessively high residual magnetism can cause arc blow during arc welding, leading to weld misalignment; and excessively high residual magnetism in bearings and gears can attract dust and other particles, severely shortening bearing life.

[0005] Monitoring residual magnetism is often done after the product has been formed. In high-cost production processes, if defective products occur during processing, timely monitoring is impossible, and losses are inevitable. Therefore, timely monitoring of residual magnetism in workpieces can greatly improve production efficiency and ensure product quality. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a method and device for detecting residual magnetism, which can detect residual magnetism in products during the production process, enabling timely monitoring and sorting, and achieving high detection efficiency and accuracy.

[0007] In a first aspect, the present invention provides a method for detecting residual magnetism, comprising the following steps:

[0008] (1) Place the test sample on the conveying mechanism and transfer the test sample to the testing mechanism through the conveying mechanism;

[0009] (2) In a zero magnetic environment, the testing agency performs residual magnetism testing on the test sample;

[0010] (3) After the test is completed, the test sample moves to the belt of the sorting mechanism; according to the test results of the testing mechanism, the test sample is classified by the sorting mechanism.

[0011] Furthermore, the zero-magnetic environment is composed of a magnetic field shielding partition and a magnetic field shielding enclosure.

[0012] Furthermore, the magnetic field shielding plate and the magnetic field shielding enclosure are made of soft magnetic materials with high magnetic permeability.

[0013] Furthermore, the high-permeability soft magnetic material is 1J85, 1J79, or 1J50 permalloy.

[0014] Furthermore, the magnetic field shielding plate is a hollow cavity with openings at the top and bottom, and the magnetic field shielding partition is rectangular, covering the top and bottom openings of the magnetic field shielding plate respectively, which can form a closed zero magnetic environment space and accommodate the test sample.

[0015] Furthermore, the magnetic field shielding plate is connected to a cylinder and moves horizontally under the drive of the cylinder to cover or move away from the upper and lower openings of the magnetic field shielding plate.

[0016] Furthermore, a fluxgate magnetometer is fixedly attached to the magnetic field shielding plate for detecting the residual magnetism of the sample.

[0017] Furthermore, the detection mechanism includes a conveyor chute and a conveyor chute baffle. The conveyor chute baffle covers the conveyor chute to ensure that the test sample slides within the conveyor chute. After being pushed out by the conveyor mechanism, the test sample enters the conveyor chute and slides to the upper opening of the magnetic field shielding plate, entering a zero-magnetic environment space. The magnetic field shielding plate covers the upper opening of the magnetic field shielding plate, forming a closed zero-magnetic environment space. In the zero-magnetic environment, the detection mechanism performs residual magnetism detection on the test sample. After the detection is completed, the magnetic field shielding plate covering the lower opening of the magnetic field shielding plate is removed under the action of the drive mechanism, and the test sample moves through the lower opening of the magnetic field shielding plate to the belt of the sorting mechanism.

[0018] Furthermore, the conveying slide has a Y-shaped cross-section, the distance between the upper opening of the conveying slide and the length of the material outlet of the conveying mechanism is equal, and the lower opening of the conveying slide is directly opposite the upper opening of the magnetic field shielding plate.

[0019] On the other hand, the present invention provides a detection device for a residual magnetism detection method, including a conveying mechanism, a detection mechanism and a sorting mechanism;

[0020] The conveying mechanism transports the test sample to the testing institution;

[0021] The detection mechanism is used to provide a zero-magnetic environment, and in the zero-magnetic environment, the detection mechanism performs residual magnetism detection on the test sample;

[0022] The sorting mechanism is used to classify the test samples according to the test results of the testing agency.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] 1. The residual magnetism detection method of this invention achieves automatic detection of test samples, enabling timely monitoring and sorting of test samples with accurate results. The residual magnetism detection device of this invention mainly includes a conveying mechanism, a detection mechanism, and a sorting mechanism. The test sample is conveyed to the detection mechanism via the conveying mechanism, and the test sample is detected in a zero-magnetic environment. Based on the detection results of the detection mechanism, the test sample is classified.

[0025] 2. The residual magnetism detection device of this invention has a wide range of applications and is flexible in application environments. It can be used for the inspection of parts during processing as well as for the inspection of parts after processing. The residual magnetism detection device of this invention can inspect precision products such as gear parts, bearing parts, medical materials, and electronic components, and the inspection results are accurate.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1 These are the left and right isometric projections of this invention;

[0029] Figure 2 This is an isometric drawing of the present invention;

[0030] Figure 3 This is a schematic diagram of the conveying mechanism of the present invention;

[0031] Figure 4 This invention detects the movement of a sample within the inner and outer housings of the conveying mechanism.

[0032] Figure 5 This is a schematic diagram of the rotating mechanism in the conveying mechanism of the present invention;

[0033] Figure 6 This is a left view of the conveying mechanism of the present invention;

[0034] Figure 7 This is a rear view of the conveying mechanism of the present invention;

[0035] Figure 8 This is a schematic diagram of the detection and sorting mechanisms of the present invention;

[0036] Figure 9 yes Figure 8 A close-up view of the testing and sorting facilities;

[0037] Figure 10 This is a schematic diagram of the assembly housing of the device of the present invention;

[0038] In the diagram: 1. Conveying mechanism; 2. Detection mechanism; 3. Sorting mechanism; 4. Equipment assembly housing; 1-1. Outer shell; 1-2. Inner shell; 1-3. Side plate I; 1-4. Side plate II; 1-5. Sprocket IV; 1-6. Lower bearing seat; 1-7. Sprocket II; 1-8. Chain II; 1-9. Sprocket III; 1-10. Slide table; 1-11. Chain I; 1-12. Upper bearing seat; 1-13. Sprocket I; 1-14. Stop bar; 1-15. Rotating shaft; 1-16. Test sample; 1-17. Motor; 1-18, Cylinder I; 1-19, Cylinder mounting bracket; 1-20, Slider; 2-1, Conveyor slide; 2-2, Sorting cylinder mounting block; 2-3, Magnetic field shielding plate; 2-4, Fluxgate magnetometer; 2-5, Cylinder II; 2-6, Magnetic field shielding partition; 2-7, Conveyor slide baffle; 3-1, Collection box; 3-2, Conveyor belt; 3-3, Cylinder mounting bracket II; 3-4, Cylinder III; 3-5, Crossbeam I; 4-1, Column; 4-2, Crossbeam II; 4-3, Crossbeam III. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0040] In the manufacturing processes of most precision products, such as gear parts, bearing parts, medical materials, and electronic components, it is crucial to strictly control the residual magnetism of the workpiece. The presence of residual magnetism severely impacts further processing of the product and the stability of precision equipment. Therefore, it is necessary to inspect the products during or after processing.

[0041] This invention provides a method for detecting residual magnetism based on a detection device, comprising the following steps:

[0042] (1) Place the test sample on the conveying mechanism and transfer the test sample to the testing mechanism through the conveying mechanism;

[0043] (2) In a zero magnetic environment, the testing agency performs residual magnetism testing on the test sample;

[0044] (3) After the test is completed, the sample moves to the belt of the sorting mechanism; according to the test results of the testing mechanism, the test sample is classified by the sorting mechanism.

[0045] Compared with existing technologies, the residual magnetism detection method of the present invention realizes automatic detection of test samples, can monitor and sort test samples in a timely manner, and the test results are accurate.

[0046] Specifically, the zero-magnetic environment is composed of a magnetic field shielding partition and a magnetic field shielding enclosure.

[0047] Specifically, the magnetic field shielding plate is a hollow cavity with openings at the top and bottom, and the magnetic field shielding partition is rectangular, covering the top and bottom openings of the magnetic field shielding plate respectively, which can form a closed zero magnetic environment space and accommodate the test sample.

[0048] Specifically, the magnetic field shielding plate and the magnetic field shielding enclosure are made of soft magnetic materials with high magnetic permeability.

[0049] Preferably, the high-permeability soft magnetic material can be a permalloy, such as alloys with grades like 1J85, 1J79, and 1J50.

[0050] Preferably, the magnetic field shielding plate is connected to a cylinder and moves horizontally under the drive of the cylinder to cover or move away from the upper and lower openings of the magnetic field shielding plate.

[0051] Magnetic field shielding plates are positioned at the upper and lower openings of the magnetic field shielding enclosure. Driven by a cylinder, these plates reciprocate horizontally. First, the lower magnetic field shielding plate, driven by the cylinder, seals the lower opening of the enclosure, allowing the sample to enter. Then, the upper magnetic field shielding plate, driven by the cylinder, seals the upper opening, creating a zero-magnetic environment for detecting residual magnetism in the sample. After detection, the plates at both openings are retracted, driven by the cylinder, releasing the sample and allowing subsequent steps to proceed. Repeating this process allows for further testing of the sample.

[0052] Specifically, a fluxgate magnetometer is fixedly mounted on the magnetic field shielding plate for detecting the residual magnetism of the sample.

[0053] Specifically, the testing mechanism includes a conveyor chute and a conveyor chute baffle. The conveyor chute baffle covers the conveyor chute to ensure that the test sample slides within the conveyor chute. After being pushed out by the conveyor mechanism, the test sample enters the conveyor chute and slides to the upper opening of the magnetic field shielding plate, entering a zero-magnetic environment space. The magnetic field shielding plate covers the upper opening of the magnetic field shielding plate, forming a closed zero-magnetic environment space. In the zero-magnetic environment, the testing mechanism performs residual magnetism detection on the test sample. After the detection is completed, the magnetic field shielding plate covering the lower opening of the magnetic field shielding plate is removed by the driving mechanism, and the test sample moves through the lower opening of the magnetic field shielding plate to the belt of the sorting mechanism.

[0054] Preferably, the conveying slide has a Y-shaped cross-section, the distance between the upper opening of the conveying slide and the length of the material outlet of the conveying mechanism is equal, and the lower opening of the conveying slide is directly opposite the upper opening of the magnetic field shielding plate.

[0055] The present invention also provides a residual magnetism detection device, including a conveying mechanism, a detection mechanism and a sorting mechanism;

[0056] The conveying mechanism transports the test sample to the testing institution;

[0057] The detection mechanism is used to provide a zero-magnetic environment, and in the zero-magnetic environment, the detection mechanism performs residual magnetism detection on the test sample;

[0058] The sorting mechanism is used to classify the test samples according to the test results of the testing agency.

[0059] Compared with existing technologies, the detection device provided by this invention can realize the automatic detection of test samples. The test sample is conveyed to the detection mechanism via a conveying mechanism. The detection mechanism includes a zero magnetic environment, which has little or no impact on the test sample, ensuring the accuracy of the test results. After the fluxgate magnetometer in the detection mechanism detects the test sample, the test sample is conveyed to the sorting mechanism, where it is classified and packaged according to the detection results of the fluxgate magnetometer. The detection device of this invention can monitor and sort test samples in a timely manner, and is highly flexible. It can be used to detect parts in the intermediate processing stage as well as parts after processing.

[0060] Specifically, in this invention, the conveying mechanism transports the test sample to the testing mechanism, and the conveying mechanism can be a conveyor belt or a hoist, or other devices capable of conveying.

[0061] Specifically, the conveying mechanism includes an overall frame, which is composed of an outer shell, an inner shell, side plate I, and side plate II.

[0062] The outer shell includes two opposing arc-shaped plates, with an inlet and an outlet pre-formed between them. The inlet and outlet are opposite each other, and the inlet is larger than the outlet. The inner shell is located inside the outer shell. The inner shell has a curved rectangular cross-section, forming a closed profile composed of two straight lines and two semicircular arcs. A certain distance exists between the outer shell and the inner shell, creating space for sample movement. Side plates I and II are fixedly connected to the two arc-shaped plates, respectively. The inner shell is also fixedly connected to side plates I and II.

[0063] Specifically, in order to improve detection efficiency and ensure detection accuracy, a raised structure is provided on the inner shell, which is divided into multiple channels. Multiple test samples can be transported at once, and the test samples are guaranteed not to interfere with each other.

[0064] The rotating mechanism includes a lower bearing housing, sprocket I, sprocket II, sprocket III, sprocket IV, chain I, chain II, upper bearing housing, stop bar, rotating shaft, and motor;

[0065] The motor is fixed inside the inner housing. Sprocket III is connected to the motor drive and is connected to sprocket IV via chain II. Sprocket IV is located directly below sprocket III. Sprocket IV and sprocket II are coaxially fixed and connected to a lower bearing housing via a rotating shaft. The rotating shaft and the lower bearing housing are connected via a bearing, and the lower bearing housing is bolted to side plate I. Sprocket IV and sprocket II are coaxially arranged, with sprocket II located on the side of sprocket IV away from the lower bearing housing and below sprocket III.

[0066] The sprocket IV is connected to sprocket I via chain I, and sprocket I is located directly above sprocket IV and on the side of sprocket III away from sprocket II. Sprocket I is connected to the upper bearing housing via a shaft, and the shaft and the upper bearing housing are connected by a bearing. The upper bearing housing is fixed to the side plate I with bolts.

[0067] A driven mechanism is provided on the side plate II. The driven mechanism includes a sprocket IV, a lower bearing seat, a chain I, an upper bearing seat, a sprocket I, and a rotating shaft. The connection relationship and the setting position are similar to those of the rotating mechanism, and will not be described in detail here. The bearing seat, sprocket, chain, and rotating shaft are all existing parts, and their specific structures are not shown.

[0068] The two ends of the stop bar are respectively connected to the chain I of the rotating mechanism and the driven mechanism, so as to advance the test sample in the conveying mechanism. The stop bar can be a long rod, a long plate, or a combination of a long plate and protrusions. The protrusions are fixed to the long plate, and the number of protrusions corresponds to the number of channels on the inner shell. The size of the protrusions is adapted to the channels.

[0069] The drive mechanism includes cylinder I, cylinder mounting bracket, and slider.

[0070] The driving mechanism also includes a slide table, which is elongated and fixed inside the inner housing. The slider is slidably connected to the slide table, and the cylinder I is fixed to the slider via a cylinder mounting bracket. The cylinder I is at the same horizontal level as the center of the discharge port, and an elongated groove is provided in the inner housing parallel to the discharge port to allow the cylinder I to extend and retract freely. When the test sample is transported to the discharge port position by the rotating mechanism, the cylinder I can push the test sample out one by one from the conveying mechanism and into the testing mechanism.

[0071] Specifically, the sorting mechanism includes a collection box, a conveyor belt, a cylinder mounting bracket II, a cylinder II, and a crossbeam I.

[0072] A cylinder mounting bracket II is fixedly connected to the crossbeam I, and a cylinder III is mounted on the cylinder mounting bracket II. A conveyor belt is connected to the side wall of the crossbeam I, located directly below the magnetic field shielding plate, for conveying the test sample, causing the test sample to move away from the magnetic field shielding plate. A collection box is located below the conveyor belt and on the side away from the crossbeam I, and the collection box corresponds to the cylinder III. The crossbeam I is fixed inside the equipment assembly housing and located below the detection mechanism.

[0073] Specifically, the sorting mechanism includes multiple collection boxes, cylinder mounting bracket II, and cylinder III, and the number of collection boxes, cylinder mounting bracket II, and cylinder III is the same.

[0074] Multiple cylinders III and collection boxes are fixedly connected to the crossbeam I, enabling the dispensing of test samples with different requirements. The number of cylinders III and collection boxes can be increased or decreased according to the actual testing range.

[0075] Specifically, the testing device also includes an equipment assembly housing, which includes a column, a crossbeam II, and a crossbeam III.

[0076] The columns, beams II and III are connected by bolts to form a hollow frame. The function of the equipment assembly housing is to support and protect the conveying mechanism, the detection mechanism, and the sorting mechanism.

[0077] To clearly explain the present invention, the following embodiments and comparative examples are provided.

[0078] Example 1

[0079] The present invention is a residual magnetism detection device, which includes a conveying mechanism 1, a detection mechanism 2, a sorting mechanism 3, and an equipment assembly housing 4.

[0080] Reference Figure 1 and Figure 2 The conveying mechanism 1 is fixed to the side wall of the equipment assembly housing 4; the detection mechanism 2 is fixed to the conveying mechanism 1 and is located inside the equipment assembly housing 4; the sorting mechanism 3 is fixed to the equipment assembly housing 4 and is located below the detection mechanism 2.

[0081] The conveying mechanism 1 includes an integral frame, a rotating mechanism and a driving mechanism installed within the integral frame.

[0082] Reference Figure 3 and Figure 4 The outer shell 1-1 includes two opposing arc-shaped plates, with an inlet and an outlet reserved between them. The inlet and outlet are on opposite sides, and the size of the inlet is larger than that of the outlet. The inner shell 1-2 is located inside the outer shell 1-1. The cross-section of the inner shell 1-2 is a curved rectangle, a closed contour composed of two straight lines and two semicircular arcs. The surface of the inner shell 1-2 has a raised structure, divided into multiple channels. A certain distance exists between the outer shell 1-1 and the inner shell 1-2, forming a space for the movement of the test sample 1-16. The side plates I1-3 and I1-3I are respectively fixed to the two arc-shaped plates. The side plates I1-3 and I1-3I are curved rectangles, and the inner shell 1-2 is also fixed to the side plates I1-3 and I1-3I.

[0083] Reference Figure 5 and Figure 6 The rotating mechanism includes sprocket IV1-5, lower bearing seat 1-6, sprocket II1-7, chain II1-8, sprocket III1-9, chain I1-11, upper bearing seat 1-12, sprocket I1-13, stop bar 1-14, rotating shaft 1-15, test sample 1-16, and motor 1-17.

[0084] The motor 1-17 is fixedly connected inside the inner housing 1-2. The sprocket III1-9 is connected to the motor 1-17 and to the sprocket IV1-5 via the chain II1-8. The sprocket IV1-5 is located directly below the sprocket III1-9. The sprocket IV1-5 is fixedly connected to the sprocket II1-7. The sprockets IV1-5 and II1-7 are connected to the lower bearing housing 1-6 via a shaft 1-15. The shaft 1-15 is connected to the lower bearing housing 1-6 via a bearing. The lower bearing housing 1-6 is fixed to the side plate I1-3 by bolts. The sprockets IV1-5 and II1-7 are coaxially arranged. The sprocket II1-7 is located on the side of the sprocket IV1-5 away from the lower bearing housing 1-6 and below the sprocket III1-9.

[0085] The sprocket IV1-5 is connected to sprocket I1-13 via chain I1-11, and sprocket I1-13 is located directly above sprocket IV1-5 and on the side of sprocket III1-9 away from sprocket II1-7. Sprocket I1-13 is connected to upper bearing seat 1-12 via shaft 1-15, and shaft 1-15 and upper bearing seat 1-12 are connected by bearings. Upper bearing seat 1-12 is bolted to side plate I1-3.

[0086] A driven mechanism is provided on the side plate II1-4. The driven mechanism includes a sprocket IV1-5, a lower bearing seat 1-6, a chain I1-11, an upper bearing seat 1-12, a sprocket I1-13, and a rotating shaft 1-15. The connection relationship and the setting position are similar to those of the rotating mechanism.

[0087] The two ends of the stop lever 1-14 are respectively connected to the chains I1-11 of the rotating mechanism and the driven mechanism, realizing the advancement of the test sample in the conveying mechanism. The stop lever 1-14 is composed of a long plate and protrusions. The protrusions are fixed to the long plate, and the number of protrusions is the same as the number of channels on the inner shell. The size of the protrusions is adapted to the channels.

[0088] The drive mechanism consists of slide 1-10, cylinder 1-18, cylinder mounting bracket 1-19, and slider 1-20.

[0089] The slide 1-10 is fixedly connected to the inner housing 1-2, and the slide 1-10 is elongated. A slider 1-20 is slidably connected to the slide 1-10, and the slider 1-20 moves along the length of the slide 1-10. The cylinder I1-18 is fixedly connected to the slide 1-10 via a cylinder mounting bracket 1-19, and the center of the cylinder I1-18 and the discharge port are located on the same horizontal plane.

[0090] Reference Figure 7 and Figure 8The testing mechanism 2 includes a conveyor slide 2-1, a sorting cylinder mounting block 2-2, a magnetic field shielding plate 2-3, a fluxgate magnetometer 2-4, a cylinder II 2-5, a magnetic field shielding partition 2-6, and a conveyor slide baffle 2-7.

[0091] The conveyor chute 2-1 is Y-shaped and fixed to the outer shell 1-1. The distance between the openings at the upper end of the conveyor chute 2-1 and the length of the discharge port are the same. A conveyor chute baffle 2-7 is fixed to the outer shell 1-1, covering the conveyor chute 2-1. A sorting cylinder mounting block 2-2 is fixed to the outer shell 1-1. Cylinders II 2-5 are fixed to the upper and lower sides of the sorting cylinder mounting block 2-2, respectively. Cylinders II 2-5 are connected to a magnetic field shielding plate 2-6. The magnetic field shielding plate 2-3 is fixed to the inner shell 1-2 and is located on the side of the magnetic field shielding plate 2-6 away from cylinders II 2-5. The magnetic field shielding plate 2-3 is a hollow structure with openings at the top and bottom. A fluxgate magnetometer 2-4 is installed on the magnetic field shielding plate 2-3. The magnetic field shielding plate 2-6 and the magnetic field shielding plate 2-3 form a closed zero-magnetic space, ensuring the accuracy of the detection results.

[0092] Reference Figure 9 The sorting mechanism 3 includes a collection box 3-1, a conveyor belt 3-2, a cylinder mounting bracket II 3-3, a cylinder III 3-4, and a crossbeam I 3-5.

[0093] The crossbeam I3-5 is fixed to the equipment assembly housing 4 and located below the detection mechanism 2. Three cylinders III3-4 are fixed to the crossbeam I3-5 via cylinder mounting brackets II3-3, and they are evenly distributed. A conveyor belt 3-2 is connected to the side wall of the crossbeam I3-5, located directly below the magnetic field shielding plate 2-3. Collection boxes 3-1 are located below the conveyor belt 3-2, and the number of collection boxes 3-1 corresponds to the number of cylinders III3-4.

[0094] Reference Figure 10 The equipment assembly housing 4 includes a column 4-1, a crossbeam II 4-2, and a crossbeam III 4-3. The column 4-1, crossbeam II 4-2, and crossbeam III 4-3 are connected by bolts to form a stable frame structure. The crossbeam I 3-5 is installed between the crossbeam II 4-2 and the inner housing 1-2.

[0095] Testing process:

[0096] The testing begins with multiple test samples 1-16 placed onto the baffle 1-14 through the inlet. The protruding structure on the inner shell 1-2 divides the test samples 1-16 into different channels, which are separated from each other and have a magnetic shielding effect. The motor 1-17 is started, driving sprocket III1-9 to rotate. Sprocket III1-9 drives sprocket IV1-5, which in turn drives sprocket II1-7 and sprocket I1-13 to rotate. This causes the baffle 1-14 to push the test samples 1-16 within the channel formed by the inner shell 1-2 and the outer shell 1-1 until the test samples 1-16 are transported to the outlet of the conveying mechanism 1. At this point, the motor 1-17 stops working.

[0097] Slider 1-20 drives cylinder I1-18 to move along the length of slide 1-10. Activating cylinder I1-18 sequentially pushes multiple test samples 1-16 into the testing mechanism 2. Test samples 1-16 move downwards along the conveyor slide 2-1. At this time, the cylinder lever of cylinder II2-5 below the sorting cylinder mounting block 2-2 is extended, and the extended magnetic field shielding partition 2-6 receives the test sample 1-16. When the test sample 1-16 enters the magnetic field shielding enclosure 2-3, cylinder II2-5 above the sorting cylinder mounting block 2-2 extends further, and the extended magnetic field shielding partition 2-6 covers the top of the magnetic field shielding enclosure 2-3. The test sample 1-16 is in the zero-magnetic space formed by the magnetic field shielding partition 2-6 and the magnetic field shielding enclosure 2-3, and the fluxgate magnetometer 2-4 performs residual magnetism detection on the test sample 1-16.

[0098] After testing, the cylinder levers of cylinders II2-5 above and below the sorting cylinder mounting block 2-2 retract, and the test sample 1-16 falls onto the conveyor belt 3-2, moving with the belt. Based on the detection results of the fluxgate magnetometer 2-4, cylinders III located at different positions push the test sample 1-16 into the corresponding collection box 3-1, completing the sorting process. Repeating the above testing steps achieves automatic sample detection, enabling timely monitoring and sorting of the test samples.

[0099] Application testing:

[0100] Application 1: The sample being tested was a titanium alloy bolt, the remanent magnetization of which was known. Ten titanium alloy bolts were placed in the testing device of this invention for testing, and the quantity in the collection box was then recorded. The test results are shown in Table 1.

[0101] Table 1 Test Results

[0102]

[0103]

[0104] Application 2: The sample tested was a Φ40mm stainless steel flange with a known residual magnetism. Ten of these flanges were sorted using the testing device of this invention, and the quantity in the collection box was recorded. The test results are shown in Table 2.

[0105] Table 2. Detection and sorting results

[0106] Group Remanence ≤ 5nT 5nT≤Remanence≤10nT 10nT≤Remanence≤50nT Flange quantity 5 3 2 Actual sorting results 5 3 2 Are they sorted correctly? yes yes yes

[0107] Application 3: The test samples consisted of 5 copper nuts and 5 stainless steel nuts. The remanent magnetization of the 10 nuts was known, with the copper nuts having a surface remanent magnetization ≤5nT and the stainless steel nuts having a surface remanent magnetization ≥50nT. The 10 mixed nuts were sorted using the testing device of this invention, and the quantity in the collection box was then recorded. The test results are shown in Table 3.

[0108] Table 3. Detection and sorting results

[0109] Nut type copper nuts Stainless steel nuts Quantity to put 5 5 Actual sorting results 5 5 Are they sorted correctly? yes yes

[0110] As can be seen from the tests in Tables 1 to 3, the detection device provided by this invention yields relatively accurate results and can detect different types of products with high efficiency.

[0111] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for detecting residual magnetism, characterized in that, Includes the following steps: (1) Place the test sample on the conveying mechanism and transfer the test sample to the testing mechanism; (2) In a zero magnetic environment, the testing organization performs residual magnetism testing on the test sample; the zero magnetic environment is composed of a magnetic field shielding partition and a magnetic field shielding enclosure. (3) After the test is completed, the test sample moves to the belt of the sorting mechanism; according to the test results of the testing mechanism, the test sample is classified by the sorting mechanism; The conveying mechanism includes an overall frame, which is composed of an outer shell, an inner shell, side plate I, and side plate II. The outer shell includes two opposing arc-shaped plates, with an inlet and an outlet reserved between the two arc-shaped plates. There is a certain distance between the outer shell and the inner shell, forming a space for the movement of the test sample. A rotating mechanism and a driving mechanism are installed within the overall frame; the rotating mechanism includes sprocket IV, lower bearing seat, sprocket II, chain II, sprocket III, chain I, upper bearing seat, sprocket I, stop bar, rotating shaft, test sample, and motor; the driving mechanism includes slide table, cylinder I, cylinder mounting bracket, and slider; The testing begins by placing multiple test samples onto the baffle from the feed inlet. The raised structure on the inner shell divides the test samples into different channels, which are separated from each other and have a magnetic shielding effect. Start the motor, which drives sprocket III to rotate. Sprocket III drives sprocket IV, which in turn drives sprocket II and sprocket I to rotate. This causes the stop lever to push the test sample through the channel formed by the inner and outer shells until the test sample is transported to the discharge port of the conveying mechanism. At this point, the motor stops working. The slider drives cylinder I to move along the length of the slide table. Activating cylinder I sequentially pushes multiple test samples into the testing mechanism. The test samples move downwards along the conveyor slide. At this time, the cylinder lever of cylinder II below the sorting cylinder mounting block is extended, and the extended magnetic field shielding partition receives the test samples. After the test samples enter the magnetic field shielding enclosure, cylinder II above the sorting cylinder mounting block extends further, and the extended magnetic field shielding partition covers the top of the magnetic field shielding enclosure. The test samples are in the zero-magnetic space formed by the magnetic field shielding partition and the magnetic field shielding enclosure, and the fluxgate magnetometer performs residual magnetism detection on the test samples.

2. The residual magnetism detection method according to claim 1, characterized in that, The magnetic field shielding plate and the magnetic field shielding enclosure are made of soft magnetic material with high magnetic permeability.

3. The residual magnetism detection method according to claim 2, characterized in that, The high-permeability soft magnetic material is 1J85, 1J79, or 1J50 permalloy.

4. The residual magnetism detection method according to claim 1, characterized in that, The magnetic field shielding enclosure is a hollow cavity with openings at the top and bottom. The magnetic field shielding partition is rectangular and covers the top and bottom openings of the magnetic field shielding enclosure, forming a closed zero-magnetic environment space and accommodating the test sample.

5. The residual magnetism detection method according to claim 4, characterized in that, The magnetic field shielding plate is connected to the cylinder and moves horizontally under the drive of the cylinder to cover or move away from the upper and lower openings of the magnetic field shielding plate.

6. The residual magnetism detection method according to claim 4, characterized in that, A fluxgate magnetometer is fixed to the magnetic field shielding plate for detecting residual magnetism in the sample.

7. The residual magnetism detection method according to claim 2, characterized in that, The testing mechanism includes a conveyor chute and a conveyor chute baffle. The conveyor chute baffle covers the conveyor chute to ensure that the test sample slides within the conveyor chute. After being pushed out by the conveyor mechanism, the test sample enters the conveyor chute and slides to the upper opening of the magnetic field shielding plate, entering a zero-magnetic environment space. The magnetic field shielding plate covers the upper opening of the magnetic field shielding plate, forming a closed zero-magnetic environment space. In the zero-magnetic environment, the testing mechanism performs residual magnetism detection on the test sample. After the detection is completed, the magnetic field shielding plate covering the lower opening of the magnetic field shielding plate is removed by the driving mechanism, and the test sample moves through the lower opening of the magnetic field shielding plate to the belt of the sorting mechanism.

8. The residual magnetism detection method according to claim 7, characterized in that, The conveying slide has a Y-shaped cross-section. The distance between the upper opening of the conveying slide and the length of the material outlet of the conveying mechanism is equal. The lower opening of the conveying slide is directly opposite the upper opening of the magnetic field shielding plate.

9. A detection apparatus for implementing the residual magnetism detection method according to any one of claims 1-8, characterized in that, This includes conveying mechanisms, testing mechanisms, and sorting mechanisms; The conveying mechanism transports the test sample to the testing institution; The detection mechanism is used to provide a zero-magnetic environment, and in the zero-magnetic environment, the detection mechanism performs residual magnetism detection on the test sample; The sorting mechanism is used to classify the test samples according to the test results of the testing agency.

Images