A full-automatic magnetic extraction detection device and method for powder materials

Abstract

The application discloses a kind of full-automatic magnetic extraction detection device and method for powder material, including shell, granular polysilicon blanking assembly, paper roll, powerful electromagnet assembly and trajectory picture capture unit;The granular polysilicon blanking assembly is connected with the top of shell, and the granular polysilicon is dropped into shell;The paper roll and the powerful electromagnet assembly are all arranged in the inside of shell, the powerful electromagnet assembly is movably arranged at the back of paper roll, the falling direction of granular polysilicon is located at the front side of paper roll, and the magnetic particles in the falling granular polysilicon are absorbed on paper roll by the magnetic force of powerful electromagnet assembly and move along with the trajectory of powerful electromagnet assembly;The trajectory picture capture unit is located at the front end of paper roll, for capturing the moving track of magnetic particles, the number of magnetic particle material is conveniently counted and output, and meanwhile, magnetic material sampling inspection report can be quickly recorded, judged, analyzed and exported.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of polysilicon production, and particularly relates to a full-automatic magnetic extraction detection device and method for powder materials. BACKGROUND

[0002] Polysilicon is mainly applied to photovoltaic industry and electronic industry, and solar-grade polysilicon usually has a purity of 6N-9N. Metal impurities in semiconductors have a great influence on the resistivity of photovoltaic cells. When a small amount of impurities is doped into semiconductors, the periodic potential field near the impurity atoms is disturbed and an additional bound state is formed, and an impurity level is added in the forbidden band.

[0003] Iron-nickel magnetic metal impurities are very important impurities in monocrystalline silicon. In silicon, the iron-nickel magnetic metal impurities generally exist in the forms of interstitial state, substitution state, complex or precipitation, often cause additional electrons or holes, change the carrier concentration of monocrystalline silicon, directly cause deep energy levels, become the recombination center of electrons and holes, greatly shorten the minority carrier lifetime, increase the PN junction leakage, and cause the performance of devices and solar photovoltaic cells to decrease.

[0004] The GCL polysilicon fluidized bed method is one of main methods for producing granular polysilicon. In order to ensure that the quality (total metal, magnetic metal impurities, carbon content) of the product granular polysilicon, especially the content of iron-nickel magnetic metal impurities, is at a qualified level, an electromagnetic demagnetizer device is arranged at a relevant position of the production line. However, there are still occasional tiny and dusty iron-nickel magnetic metal impurities mixed in the product. The content of iron-nickel magnetic metal impurities in the normal granular polysilicon product is zero, and the qualified content is ≤3 per 5 kg.

[0005] The reason for the increase of the iron-nickel magnetic metal impurities in the product granular polysilicon is that the metal pipeline with a lining and the equipment wear cause the lining to be damaged, the product directly contacts the iron-based metal pipeline, and the content of the iron-nickel magnetic metal impurities increases. In the initial stage of the damage of the lining, the content of the iron-nickel magnetic metal impurities increases very obviously. Therefore, the detection of the iron-nickel magnetic metal impurities in the product is one of important means for judging the wear of the lining of the pipeline and equipment.

[0006] Due to the characteristics of the photovoltaic industry, the product granular polysilicon is periodically sampled and detected in the laboratory. The detection contents are impurity analysis and zone melting analysis. The impurity analysis mainly includes the content of metal-based impurities, particle size, and surface dust turbidity. The zone melting analysis mainly analyzes the content of donor impurities, acceptor impurities, carbon, and hydrogen. The laboratory detection has high precision. Due to the influence of the detection equipment, the sampling amount of the granular polysilicon product is small (the sampling amount is 1 kg). When the pipeline is slightly worn, the abnormal increase of the content of the metal-based impurities may not be detected.

[0007] In order to deal with the early situation of pipeline, equipment lining damage, etc., it is necessary to periodically sample the product in granular polysilicon production (5 kg per day per production line), and then manually detect the content of iron and nickel magnetic metal impurities with a magnetic rod. The qualified standard is ≤3 per 5 kg.

[0008] In order to ensure the accuracy of the test results and not be affected by environmental factors, the sampling detection of the content of iron and nickel magnetic metal impurities in granular polysilicon mainly concentrates in the clean packaging room, and the core material of granular polysilicon production, seed crystal, also needs to be regularly detected for the content of iron and nickel magnetic metal impurities. At present, the sampling detection of magnetic substances uses a standard white printing paper coated strong magnetic rod for manual detection. If there are magnetic particle impurities, they will be attracted by the magnetic rod. These magnetic particle impurities can be identified by the naked eye. By rotating (or moving) the magnetic rod, the magnetic particle impurities can be seen moving with the guidance of the magnetic rod. This method relies entirely on manual operation and naked eye identification, and is highly subjective. Moreover, the standard white paper coated outside is extremely easy to turn black and break, affecting people's subjective judgment, and the magnetic extraction efficiency is low and slow, and the detection results often have a 12-hour lag. If the pipeline or equipment is damaged, the product quality is not corrected in time, resulting in all the produced products being unqualified waste, causing resource and financial waste.

[0009] At present, the quality detection of granular polysilicon is laboratory detection and manual detection. Laboratory detection has the absolute authority. Laboratory detection uses instrument analysis method, which has the characteristics of accurate detection and small error, but is greatly affected by sampling method, sampling site and sampling amount. In the early stage of pipeline and equipment lining wear, laboratory detection may not be detected, which needs to be detected by laboratory detection + manual detection. Manual detection is mainly the number detection of iron and nickel magnetic metal impurities, which is used to judge the product quality decline caused by early pipeline and equipment lining wear.

[0010] At present, the manual detection of the number of iron and nickel magnetic metal impurities completely relies on manual operation. First, sampling is carried out at the discharge port of the packaging machine, and 5 kg of sample is packaged in a high-purity clean PE bag after vacuumizing, then the production batch number is attached, and then it is stored in a sampling box. The quality detection personnel use standard clean A3 printing paper to coat the magnetic rod, use a ceramic knife to break the bag, and then slowly pour the granular polysilicon product onto the magnetic rod coated with printing paper, and simultaneously rotate and move the magnetic rod to make the magnetic rod and the printing paper move relative to each other. After 5 kg of granular silicon product is poured completely, the magnetic rod is moved again, and whether there are impurities moving with the magnetic rod on the surface of the printing paper is observed. If there are impurities moving with the magnetic rod, it is determined that the impurities are iron and nickel magnetic metal impurities, which are counted manually and recorded. The quality detection personnel analyze and judge whether the production line has damage according to the data trend.

[0011] The current method has the following defects and disadvantages: (1) high environmental requirements for manual detection: the quantity of iron-nickel magnetic metal impurities must be detected in a clean space to prevent sample contamination and affect detection accuracy. (2) Human detection is greatly affected by human factors: Before manual detection, the quality monitoring personnel need to wear necessary clean clothes and clean gloves to detect the iron-nickel magnetic metal impurities. The clean printed paper needs to be manually wrapped around the magnetic bar, and the magnetic bar also needs to be sealed. In this process, foreign matter can easily be introduced into the magnetic bar, causing detection errors. After detection, manual counting is required. When the granular polysilicon product has high turbidity and the printed paper is heavily contaminated, it will interfere with the judgment of the quality monitoring personnel. (3) Long time-consuming for manual detection: According to the production capacity of 100,000 tons / year of granular polysilicon, 5 kg of sample needs to be taken from each production line every day, a total of 32 production lines, 32 samples need to be taken, and samples that exceed the normal range need to be retested. The detection time of each 1 kg sample is about 2 minutes, and the total detection time is about 1 hour. Since all operations are manual, the physical requirements for the operator are also very high. Manual transcription during the summary stage: After all samples are detected, they need to be transcribed and arranged. This process is also a manual operation process, and errors can greatly affect the results. SUMMARY

[0012] The technical problem to be solved by the present application is to provide a device for sampling and detecting magnetic metal impurities in granular polysilicon production and other high-purity powder materials.

[0013] To achieve the above-mentioned purpose, the technical solutions adopted by the present application are as follows:

[0014] A full-automatic magnetic sampling and detecting device for powder materials, comprising a shell, a granular polysilicon discharging assembly, a paper roll, a strong electromagnet assembly, and a trajectory picture capturing unit; the granular polysilicon discharging assembly is connected to the top of the shell to drop the granular polysilicon into the shell; the paper roll and the strong electromagnet assembly are both arranged inside the shell, the strong electromagnet assembly is movably arranged at the back side of the paper roll, the falling direction of the granular polysilicon is located at the front side of the paper roll, the magnetic particles in the falling granular polysilicon are adsorbed on the paper roll by the magnetic force of the strong electromagnet assembly and move along the trajectory of the strong electromagnet assembly; the trajectory picture capturing unit is located at the front end of the paper roll to capture the moving trajectory of the magnetic particles.

[0015] Further, the shell is located at the bottom of the falling direction of the granular polysilicon, and is provided with a granular polysilicon collecting groove and a weighing module.

[0016] Specifically, the strong electromagnet assembly is externally provided with an electromagnet fixing frame, an electric motor is connected to the outside of the strong electromagnet fixing frame, and the strong electromagnet fixing frame and the strong electromagnet assembly inside the strong electromagnet fixing frame are driven to reciprocate by the electric motor.

[0017] Specifically, the strong electromagnet assembly comprises a magnet mounting plate and strong electromagnets mounted on the magnet mounting plate; the strong electromagnets are in a group and are uniformly distributed on the magnet mounting plate in a central symmetry; one side of the magnet mounting plate is provided with a motor connecting hole, a rotating shaft of the motor is connected and fixed with the motor connecting hole, and the magnet mounting plate is driven by the motor to eccentrically rotate around the motor connecting hole, so as to drive the external electromagnet fixing frame to move.

[0018] Further, the electromagnet fixing frame is installed on a pair of connecting rod positioning pegs through connecting rod fixing frames on two sides and can reciprocate along the direction of the connecting rod fixing frame between the two connecting rod positioning pegs; when the magnet mounting plate is driven by the motor to eccentrically rotate, the magnet mounting plate pushes the electromagnet fixing frame to reciprocate along the direction of the connecting rod fixing frame; the motor is installed and fixed on the electromagnet fixing frame, and the motor drives the magnet mounting plate to move with the electromagnet fixing frame, so that the strong electromagnets on the magnet mounting plate move in a planetary orbit in the movement area.

[0019] Further, the paper roll is conveyed by a paper roll transmission assembly arranged in the shell to replace the magnetic attraction surface of the paper roll in front of the strong electromagnet assembly.

[0020] Specifically, the paper roll transmission assembly comprises a driving system assembly, a driven system assembly and a group of supporting rollers; one end of the paper roll is wound on the driving system assembly, and the other end is wound on the driven system assembly; through the step-by-step rotation of the driving system assembly, the clean paper roll is transmitted to the front of the strong electromagnet assembly as a new magnetic attraction surface, and the old paper roll with magnetic particles is wound on the driving system assembly.

[0021] Specifically, the driving system assembly is fixedly installed on a driving spool, and the driven system assembly is fixedly installed on a driven spool; the two ends of the driving spool and the driven spool are respectively shaft-connected to the shell.

[0022] Specifically, the driven system assembly and the driving system assembly each comprise a paper roll positioner, a flange, a bracket stopper and a paper roll bracket; the paper roll positioner is fixed with a paper roll inner cylinder, and the flanges on two sides are used for fixing the paper roll inner cylinder; the bracket stopper is fixed with a spool, and the bracket stopper, the paper roll positioner and the paper roll inner cylinder are driven to rotate together through the spool.

[0023] Specifically, the trajectory picture capturing unit comprises an infrared camera and a communication module; the infrared camera is located in front of the magnetic attraction surface of the paper roll on one side of the strong electromagnet assembly, is used for quickly capturing the picture of the moving magnetic particle material on the surface of the paper roll, and transmits the picture data to the background microcomputer through the communication module.

[0024] Further, the application also provides a method for detecting the magneticity of powder material by using the device, which comprises the following steps:

[0025] (1) The granular polysilicon is discharged by the granular polysilicon discharging assembly, and the trajectory motion of the strong electromagnet assembly is driven at the same time, the magnetic particles in the falling powder material are separated by the magnetic force, and are adsorbed on the surface of the paper roll and move with the strong electromagnet assembly;

[0026] (2) The trajectory picture capturing unit records the motion trajectory picture of the magnetic particles on the surface of the paper roll;

[0027] (3) When a batch of powder material is discharged, the trajectory picture capturing unit sends the recorded motion trajectory picture of the magnetic particles to the external microcomputer for processing, and the number of the magnetic particles is calculated and analyzed;

[0028] (4) The new paper roll is replaced, and the next batch of powder material is detected.

[0029] Beneficial effects:

[0030] (1) The device realizes the on-line, real-time and closed sampling detection of the content of magnetic metal impurities in the granular polysilicon material by the cooperation of the strong electromagnet, the collecting groove and the weighing module, ensures that the small amount of powder carried by the granular material is all in the device and there is no risk of escaping to the external environment, and indirectly ensures the quality of the external air environment.

[0031] (2) The device realizes the simple harmonic motion of the electromagnet in the motion area by the cooperation of the strong electromagnet assembly, the electromagnet fixing frame and the motor, realizes the efficient separation of the magnetic particles, and uses the infrared camera to quickly capture the motion trajectory picture of the magnetic particles, so that the number of the magnetic particle materials can be counted and output, and the magnetic material sampling detection report can be quickly recorded, judged, analyzed and exported. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or other aspects of the application will become more apparent by describing in detail the preferred embodiments thereof with reference to the attached drawings.

[0033] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the full-automatic magneticity sampling detection device.

[0034] Figure 2 Fig. 3 is an assembly diagram of the strong electromagnet assembly and the electromagnet fixing frame.

[0035] Figure 3 Fig. 4 is a structural diagram of the strong electromagnet assembly.

[0036] Figure 4 Fig. 5 is a structural diagram of the active system assembly.

[0037] Figure 5 is a structural schematic diagram of the driven system assembly.

[0038] In the drawings, reference numerals designate the following items:

[0039] 1 housing; 2 first idler roller; 3 second idler roller; 4 paper roll; 5 driven roll; 6 driven system assembly; 6-1 driven paper roll positioner; 6-2 driven flange; 6-3 driven bracket stopper; 6-4 driven paper roll bracket; 7 feed cut-off valve; 8 driving system assembly; 8-1 driving paper roll positioner; 8-2 driving flange; 8-3 driving bracket stopper; 8-4 driving paper roll bracket; 9 driving roll; 10 third idler roller; 11 strong electromagnet assembly; 11-1 magnet mounting plate; 11-2 strong electromagnet; 11-3 motor connecting hole; 12 electromagnet fixing frame; 12-1 first connecting rod; 12-2 second connecting rod; 12-3 first connecting rod positioning pin; 12-4 second connecting rod positioning pin; 13 infrared camera; 14 communication module; 15 granular polysilicon collecting groove; 16 weighing module; 17 blanking pipe; 18 vacuum port; 19 motor. DETAILED DESCRIPTION

[0040] The present application can be better understood according to the following examples.

[0041] The structures, proportions, sizes, etc. shown in the drawings of the specification are merely intended to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not intended to limit the implementation conditions of the present application, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "front", "rear", "middle" and the like used in the specification are only for the convenience of clear description, and are not intended to limit the implementation range of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0042] As Figure 1As shown, the full-automatic powder material magnetic extraction detection device includes a shell 1, a granular polysilicon discharging assembly, a paper roll 4, a strong electromagnet assembly 11, and a trajectory picture capturing unit. The granular polysilicon discharging assembly is connected to the top of the shell 1 to drop the granular polysilicon into the shell 1. The paper roll 4 and the strong electromagnet assembly 11 are both arranged inside the shell 1. The strong electromagnet assembly 11 is movably arranged at the rear side of the paper roll 4. The falling direction of the granular polysilicon is at the front side of the paper roll 4. The magnetic particles in the falling granular polysilicon are attracted to the paper roll 4 by the magnetic force of the strong electromagnet assembly 11 and move along the trajectory of the strong electromagnet assembly 11. The trajectory picture capturing unit is arranged at the front end of the paper roll 4 to capture the moving trajectory of the magnetic particles.

[0043] The shell 1 is arranged at the bottom of the falling direction of the granular polysilicon and is provided with a granular polysilicon collecting groove 15 and a weighing module 16. The granular polysilicon collecting groove 15 is lined with clean PE bags. The PE bags are regularly removed when full. The bottom of the shell 1 is provided with supporting legs to support the overall weight of the equipment. The top of the shell 1 is provided with a vacuum port 18.

[0044] The strong electromagnet assembly 11 is externally provided with an electromagnet fixing frame 12. The electromagnet fixing frame 12 is externally connected with a motor 19 to drive the electromagnet fixing frame 12 and the strong electromagnet assembly 11 inside the electromagnet fixing frame 12 to reciprocate.

[0045] The granular polysilicon discharging assembly extends into the shell 1 through a discharging pipe 17. The discharging pipe 17 is provided with a feeding cut-off valve 7. After the device is powered on, the feeding cut-off valve 7 is opened. The motor 19 drives the strong electromagnet assembly 11 to rotate. A brand-new standard A3 clean paper roll 4 will automatically cover the entire strong electromagnet fixing frame 12. The vacuum port 18 is connected with an external vacuum pump device to start, so that a micro-negative pressure is formed in the device. At the same time, the granular silicon particles slowly descend along the discharging pipe 17. The iron-nickel magnetic metal impurities (small dust magnetic particles or granular polysilicon product coated magnetic metal impurity particles) will be immediately attracted by the strong electromagnet assembly 11 and move along the trajectory of the strong electromagnet assembly 11. The non-magnetic granular polysilicon falls into the granular polysilicon collecting groove 15 by gravity. When the weighing module 16 arranged at the bottom of the collecting groove detects that the cumulative weight of the feeding material is 5 kg, the feeding cut-off valve 7 is automatically closed in linkage. The sampling of the iron-nickel magnetic metal impurities is completed.

[0046] In combination Figure 2 With Figure 3The strong electromagnet assembly 11 comprises a magnet mounting plate 11-1 and strong electromagnets 11-2 mounted on the magnet mounting plate 11-1; the strong electromagnets 11-2 are in a group and are uniformly distributed on the magnet mounting plate 11-1 in a central symmetry; one side of the magnet mounting plate 11-1 is provided with a motor connecting hole 11-3, the rotating shaft of the motor 19 is connected and fixed with the motor connecting hole 11-3, and the magnet mounting plate 11-1 is driven to eccentrically rotate around the motor connecting hole 11-3 by the motor 19, so as to drive the external electromagnet fixing frame 12 to move.

[0047] The electromagnet fixing frame 12 is installed on a pair of connecting rod positioning pins through the fixing frame connecting rods on both sides and can reciprocate between the connecting rod positioning pins along the direction of the fixing frame connecting rods; when the magnet mounting plate 11-1 is driven to eccentrically rotate by the motor 19, the magnet mounting plate 11-1 pushes the electromagnet fixing frame 12 to reciprocate along the direction of the fixing frame connecting rods; the motor 19 is installed and fixed on the electromagnet fixing frame 12, and the motor 19 drives the magnet mounting plate 11-1 to move with the electromagnet fixing frame 12, so that the strong electromagnets 11-2 on the magnet mounting plate 11-1 move in a planetary trajectory in the movement area.

[0048] The trajectory picture capturing unit comprises an infrared camera 13 and a communication module 14; the infrared camera 13 is located in front of the magnetic attraction surface of the strong electromagnet assembly 11 on one side of the roll paper 4, is used for quickly capturing the picture of the moving magnetic particle matter on the surface of the roll paper 4, and transmits the picture data to the background microcomputer through the communication module 14 and counts (see the invention patent CN1509453A or the prior art). The moving particle matter is the iron-nickel magnetic metal impurity, the background microcomputer records and outputs the current batch of iron-nickel magnetic metal impurity data, the microcomputer can communicate with the MES system (production information management system) and the DCS system (distributed control system), and can upload the metal impurity content detection data of each batch to the MES system and the DCS system, to help operators and managers analyze product quality.

[0049] The granular polysilicon production is controlled through the DCS system, the iron-nickel magnetic metal impurity detection software system is arranged in the microcomputer, the software system communicates with the DCS system, the production information of each production line is distributed in the DCS system, the production information includes product processing batch number, equipment running time, product laboratory detection result and the like, after the device detects the iron-nickel magnetic metal impurity, the DCS is automatically saved, and the on-site real-time viewing can be realized on the microcomputer.

[0050] In combination Figure 1 The roll paper 4 is conveyed through the roll paper transmission assembly arranged in the shell 1, so as to replace the magnetic attraction surface of the roll paper 4 located in front of the strong electromagnet assembly 11.

[0051] The paper winding transmission assembly comprises a driving system assembly 8, a driven system assembly 6, and a first paper roller 2, a second paper roller 3, and a third paper roller 10. One end of the paper 4 is wound on the driving system assembly 8, and the other end is wound on the driven system assembly 6. Through the step-by-step rotation of the driving system assembly 8, the clean paper is transmitted to the front of the strong electromagnet assembly 11 as a new magnetic surface, and the old paper with magnetic particles is wound on the driving system assembly 8.

[0052] The driving system assembly 8 is fixedly installed on a driving reel 9, and the driven system assembly 6 is fixedly installed on a driven reel 5. The driving reel 9 and the driven reel 5 are respectively connected to the housing 1 at both ends.

[0053] In combination Figure 4 With Figure 5 , the driving system assembly 8 comprises a driving paper positioner 8-1, a driving flange 8-2, a driving bracket stopper 8-3, and a driving paper bracket 8-4. The driving paper positioner 8-1 is fixed with the paper inner cylinder, which plays a role in fixing the standard A3 clean paper and ensures that the paper roll rotates at a certain speed. The driven bracket stopper 6-4 is fixed with the reel, and the driving paper bracket 8-4 supports the weight of the entire paper roll. The driving flange 8-2 on both sides is used to fix the paper inner cylinder, and the driving bracket stopper 8-3 is fixed with the reel, which drives the driving bracket stopper 8-3, the driving paper positioner 8-1, and the paper inner cylinder to rotate together through the driving reel 9. The driven system assembly 6 comprises a driven paper positioner 6-1, a driven flange 6-2, a driven bracket stopper 6-3, and a driven paper bracket 6-4. The driven paper positioner 6-1 is fixed with the paper inner cylinder, and the driven flange 6-2 on both sides is used to fix the paper inner cylinder, which drives the driven bracket stopper 6-3, the driven paper positioner 6-1, and the paper inner cylinder to rotate together through the driven reel 5.

[0054] When the equipment is stopped, the strong electromagnet assembly 11 loses power, and the driving system assembly 8 drives the driven system assembly 6 to rotate, replacing the contaminated A3 clean paper, thereby realizing long-term operation. In order to ensure the cleanliness inside the automatic magnetic extraction device, a vacuum port 18 is provided at the top of the device to extract the trace dust contained in the material.

[0055] The primary purpose of the device design is to detect the number of iron-nickel magnetic metal impurities in the granular polysilicon product to infer whether the lining of the pipeline and equipment contacted in the production line and product processing process is damaged, and secondly to preliminarily determine whether the product is qualified from a macroscopic perspective. If the number of iron-nickel magnetic metal impurities in the granular polysilicon product is > 3 per 5 kg, it indicates that the current batch of product has too high a content of magnetic metal impurities, and systematic inspection of the production line or degradation of the product is required. However, the absence of magnetic metal impurities does not mean that the product quality is qualified, and laboratory testing of the granular polysilicon product is still required to quantify the detection data as a criterion for determining the quality of the granular polysilicon product. The device is directly installed on the production line and does not require a separate room for magnetic metal impurities. The device is independent and completely sealed, and is environmentally friendly. After installation on the production line, the device can quickly detect the number of magnetic metal impurities, taking about 30 seconds. After detecting the content of magnetic metal impurities in the product, a report can be automatically generated and displayed simultaneously in the DCS system.

[0056] The application provides a kind of for powder material full-automatic magnetic extraction detection device and method, and the method and approach for specifically realizing the technical scheme are many, above-mentioned only is the preferred embodiment of the present application, it should be pointed out, for the ordinary skilled in the art, under the premise of not departing from the principle of the present application, can also make several improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the present application. The components not explicitly described in the embodiment can be realized by existing technology.

Claims

1. A full-automatic magnetic extraction detection device for powder materials, characterized in that, Including shell (1), granular polycrystalline silicon blanking assembly, roll paper (4), strong electromagnet assembly (11), trajectory picture capture unit and background microcomputer;The granular polycrystalline silicon blanking assembly is connected with the top of shell (1), and the granular polycrystalline silicon falls into the shell (1);The roll paper (4) and the strong electromagnet assembly (11) are arranged in the shell (1), the strong electromagnet assembly (11) is movably arranged at the rear side of the roll paper (4), the falling direction of the granular polycrystalline silicon is located at the front side of the roll paper (4), the magnetic particles in the falling granular polycrystalline silicon are attracted on the roll paper (4) by the magnetic force of the strong electromagnet assembly (11) and move along the trajectory of the strong electromagnet assembly (11);The trajectory picture capture unit is located at the front end of the roll paper (4), which is used for capturing the moving trajectory of the magnetic particles and transmitting the recorded moving trajectory picture of the magnetic particles to the external microcomputer for processing, and the number of magnetic particles is calculated; The strong electromagnet assembly (11) is provided with an electromagnet fixing frame (12) outside, and an electric motor (19) is connected outside the electromagnet fixing frame (12), and the electromagnet fixing frame (12) and the strong electromagnet assembly (11) inside the electromagnet fixing frame (12) are driven to reciprocate by the electric motor (19); The strong electromagnet assembly (11) includes a magnet mounting plate (11-1) and a strong electromagnet (11-2) mounted on the magnet mounting plate (11-1);The strong electromagnet (11-2) is a group, which is uniformly distributed on the magnet mounting plate (11-1) in a central symmetry;One side of the magnet mounting plate (11-1) is provided with a motor connecting hole (11-3), and the rotating shaft of the electric motor (19) is connected and fixed with the motor connecting hole (11-3), and the magnet mounting plate (11-1) is driven to eccentrically rotate around the motor connecting hole (11-3) by the electric motor (19), so as to drive the external electromagnet fixing frame (12) to move; The electromagnet fixing frame (12) is installed on a pair of connecting rod positioning pins through the connecting rod connecting rods on both sides, and can reciprocate between the connecting rod positioning pins along the connecting rod connecting rod direction;When the magnet mounting plate (11-1) is driven to eccentrically rotate by the electric motor (19), the magnet mounting plate (11-1) pushes the electromagnet fixing frame (12) to reciprocate along the connecting rod connecting rod direction;The electric motor (19) is installed and fixed on the electromagnet fixing frame (12), and the electric motor (19) drives the magnet mounting plate (11-1) to move with the electromagnet fixing frame (12), so that the strong electromagnet (11-2) on the magnet mounting plate (11-1) moves in a planetary trajectory in the movement area.

2. The full-automatic magnetic extraction detection device for powder materials according to claim 1, characterized in that, The shell (1) is located at the bottom of the falling direction of the granular polycrystalline silicon, and is provided with a granular polycrystalline silicon collecting groove (15) and a weighing module (16).

3. The full-automatic magnetic extraction detection device for powder materials according to claim 1, characterized in that, The roll paper (4) is conveyed by the roll paper transmission assembly arranged in the shell (1), so as to replace the magnetic surface of the roll paper (4) in front of the strong electromagnet assembly (11).

4. The full-automatic magnetic extraction detection device for powder materials according to claim 3, characterized in that, The paper roll transmission assembly comprises a driving system assembly (8), a driven system assembly (6) and a set of supporting rollers; one end of the paper roll (4) is wound on the driving system assembly (8), and the other end is wound on the driven system assembly (6); through the step-by-step rotation of the driving system assembly (8), the clean paper roll is transmitted to the front of the strong electromagnet assembly (11) as a new magnetic surface, and the old paper roll with magnetic particles is wound on the driving system assembly (8).

5. The full-automatic magnetic extraction detection device for powder materials according to claim 4, characterized in that, The driving system assembly (8) is fixedly installed on a driving shaft (9), and the driven system assembly (6) is fixedly installed on a driven shaft (5); the two ends of the driving shaft (9) and the driven shaft (5) are respectively connected with the shell (1) through shafts; the driven system assembly (6) and the driving system assembly (8) both comprise a paper roll positioner, a flange, a bracket stopper and a paper roll bracket; the paper roll positioner is fixed with a paper roll inner cylinder, and the flanges on both sides are used for fixing the paper roll inner cylinder; the bracket stopper is fixed with the shaft, and the bracket stopper, the paper roll positioner and the paper roll inner cylinder are driven to rotate together through the shaft.

6. The full-automatic magnetic extraction detection device for powder materials according to claim 1, characterized in that, The trajectory picture capturing unit comprises an infrared camera (13) and a communication module (14); the infrared camera (13) is located in front of the magnetic surface of the paper roll (4) on one side of the strong electromagnet assembly (11), is used for quickly capturing the picture of the moving magnetic particles on the surface of the paper roll (4), and transmits the picture data to the background microcomputer through the communication module (14).

7. A method for detecting the magnetic properties of a powder material by using the device of claim 1, characterized in that, The method comprises the following steps: (1) the granular polycrystalline silicon is discharged through the granular polycrystalline silicon discharge assembly, meanwhile, the strong electromagnet assembly is driven to move in a trajectory, the magnetic particles in the falling powder material are separated out by magnetic force, and are adsorbed on the surface of the paper roll and move together with the strong electromagnet assembly; (2) the trajectory picture capturing unit records the moving trajectory picture of the magnetic particles on the surface of the paper roll; (3) after a batch of powder material is discharged, the trajectory picture capturing unit transmits the recorded moving trajectory picture of the magnetic particles to the external microcomputer for processing, and calculates the number of magnetic particles; (4) a new paper roll is replaced, and the next batch of powder material is detected.

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