A screening device using laser induced breakdown spectrometer

Abstract

The present application relates to the field of equipment technology, and in particular to a screening device using a laser induced breakdown spectrometer, the screening device comprising a conveying track, a mounting frame and a screening assembly, the mounting frame and the screening assembly are both located above the conveying track, the mounting frame is used to install detection and analysis equipment, the screening assembly comprises a pressing assembly capable of adjusting the spacing, the pressing assembly can be raised and lowered, a cloth assembly capable of being towed is arranged above the pressing assembly, a mechanical arm is arranged on the screening assembly, the clamping claws on the mechanical arm are used to tow the cloth part in the cloth assembly to between the pressing assemblies, and the screening assembly also comprises a feeding assembly. The present application uses a laser induced breakdown spectrometer to accurately determine the composition of the material, and then cooperates with the screening equipment in this scheme to timely separate the material, thereby avoiding unnecessary energy consumption increase in the later processing and production process.

Description

Technical Field

[0001] The present application relates to the field of industrial production, and in particular to a screening device using a laser induced breakdown spectrometer. Background Art

[0002] In mineral processing and soil testing, it is usually necessary to accurately separate certain impurities or components to improve the efficiency of subsequent processes. These components to be separated may be similar to the material due to factors such as structure or properties, resulting in poor screening effect of conventional mechanical screening devices.

[0003] Laser Induced Breakdown Spectroscopy (LIBS) is a spectrometer that uses a high-energy laser beam to irradiate the sample surface to generate plasma on the sample surface, and obtains the elemental composition and concentration information of the sample by analyzing the spectrum of plasma radiation.

[0004] Laser induced breakdown spectrometer has the following characteristics and advantages: rapid analysis capability, no need for complex sample preparation, high sensitivity and high precision, and non-destructive testing. By using laser induced breakdown spectrometer, the efficiency of screening equipment in removing impurities or certain components can be improved, thereby reducing the pressure of the material during the later stage of impurity removal and improving the corresponding detection or processing efficiency.

[0005] In the screening equipment currently using laser induced breakdown spectrometry, such as coal screening equipment, the coal to be screened continues to move horizontally on a conveyor track. The coal on the conveyor track will first pass through the area where LIBS is located. LIBS uses high-energy lasers to excite the surface of the coal to produce plasma, and obtains the elemental composition and concentration information of the coal by analyzing the spectrum emitted by the plasma. At this time, the current position of the coal and the displacement rate of the conveyor will be recorded. When it is detected that the composition of some coal is significantly different from the spectral detection results of conventional coal, the coal with this abnormal component will be detected. When leaving the current transportation track, the coal with abnormal components is separated from the overall coal transportation route by using air pump blowing or direct disturbance of mechanical structure.

[0006] Although this method can remove impurities from the coal, the material may be displaced during transportation. When the impurity content is actually relatively small, the above-mentioned method of stripping impurities will cause some normal coal to be stripped away together with the impurities, and the impurity removal efficiency is difficult to guarantee. Summary of the invention

[0007] In order to improve the screening accuracy of the screening equipment, the present application provides a screening equipment using a laser induced breakdown spectrometer.

[0008] The present application provides a screening device using a laser induced breakdown spectrometer, which adopts the following technical solution: A screening device using a laser induced breakdown spectrometer, the screening device comprising a conveying track, a mounting frame and a screening component, the mounting frame and the screening component are both located above the conveying track, the mounting frame is used to install a detection and analysis device, the screening component comprises a pressing component capable of adjusting the spacing, the pressing component can be raised and lowered, a cloth component that can be towed is mounted above the pressing component, a mechanical arm is provided on the screening component, the clamping claws on the mechanical arm are used to tow the cloth part in the cloth component to between the pressing components, and the screening component also comprises a feeding component.

[0009] By adopting the above technical scheme, the material in the conveying process can be screened once, so as to separate the impurities in the material. In addition, due to the use of laser induced breakdown spectrometer in this scheme, the composition of the currently passing material can be accurately judged. Combined with the mechanical arm in this scheme, the cloth is pulled down between the lower pressure plates, thereby forming a net bag structure between the lower pressure plates, and the area with abnormal composition at the detection point is separated by the net bag structure.

[0010] In a specific feasible implementation scheme, the fabric assembly includes a fabric cabinet, which is capable of horizontal sliding, and the horizontal sliding direction of the fabric cabinet is perpendicular to the conveying direction of the conveying track. A plurality of rolls of fabric are arranged in the fabric cabinet, and the free ends of the fabric extend out of the fabric cabinet. A clamp is fixedly connected to the portion of the fabric extending out of the fabric cabinet, and the clamp is arranged in a row.

[0011] By adopting the above technical solution, by connecting a clamping block at the free end of the cloth, the cloth in the cloth cabinet can be formed into cloth of different widths by means of synchronous clamping of multiple clamping blocks. The spacing between the cloths in the cloth cabinet is first controlled within a very small range. When a structural member appears that can be connected to multiple clamping blocks at the same time, the cloths in the cloth cabinet pulled out by the clamps can be approximately regarded as a whole.

[0012] In a specific feasible implementation scheme, the cross-sectional shapes of all the card blocks are the same and are all arrow-shaped. A guide block cache rack is arranged outside the material distribution cabinet, and a plurality of grooves are opened circumferentially inside the guide block cache rack. Each groove is used to store first guide blocks of different lengths. A slot is opened on the side wall of the first guide block, and the shape of the slot matches the cross-sectional shape of the card block. Second cylinders are installed on both sides of the material distribution cabinet, and the output end of the second cylinder can contact the side wall portion of the first guide block in its own moving direction.

[0013] By adopting the above technical solution, the arrow shape of the card block means that the first guide block that can cover the outer wall of the card block can match and drive the card block to move. Under the clamping and pulling of the clamping claws, the first guide block can be quickly clamped, and the first guide block can contact multiple card blocks at the same time in the length direction. Multiple first guide blocks for embedding card blocks can be arranged in the inner ring direction of the guide block cache rack. The length of the outer side of each guide block is different. When corresponding to the detection of abnormal areas of different sizes, the spacing adjustment between the lower pressure plates can be achieved by the two parallel screw structures to make the screw nuts approach or move away from each other. The cloth can be moved horizontally through the cloth cabinet, and the first guide block of the specified length can be selected at the same time. , by default, this length is equal to the spacing between the two lower pressing plates. By utilizing the cache rack next to the fabric cabinet and the second cylinder, the second cylinder can push the first guide block in the guide block cache rack or on the card block on its moving path. The two second cylinders push the first guide block on both sides of the card block and the guide block cache rack, thereby accurately adjusting the position of the first guide block so that the first guide block can clamp multiple and specified numbers of card blocks at the same time. At this time, the position of the first guide block is adjusted, the position of the fabric cabinet is adjusted, and the length of the first guide block is selected, thereby completing the overall width adjustment of the fabric, so that the overall width of the fabric pulled by the first guide block is basically the same as the spacing between the two lower pressing plates.

[0014] In a specific possible implementation mode, a plurality of first rollers are installed in the fabric cabinet, the first rollers are used to roll up the fabric, and the ends of the first rollers are fixedly connected to the driving units.

[0015] By adopting the above technical solution, by fixing the driving unit at the end of the first roller, the first roller and the driving unit, which can be a motor or a cylinder, etc., are connected to each other, thereby realizing the winding control of a single roll of cloth.

[0016] In a specific feasible implementation scheme, the pressing assembly includes a mounting plate, the top of the mounting plate is fixedly connected to the output end of a cylinder, two screw rod structures are fixedly installed on the bottom end surface of the mounting plate, the length direction of each screw rod structure is parallel to the horizontal plane and perpendicular to the conveying direction of the conveying track, each screw rod structure has a screw rod nut that reciprocates in the length direction, and a lower pressing plate is fixedly installed on the bottom end of each screw rod nut, two arc tracks are installed on the top end surface of the mounting plate, a first cylinder is installed on the arc track, the top end surface of the lower pressing plate is opened, the output end of the first cylinder can match and extend into the opening of the lower pressing plate, a plurality of notches are opened on the side wall of the lower pressing plate facing the other lower pressing plate, and a limiting hole is opened on the side wall of the free end of the first guide block.

[0017] By adopting the above technical solution, the mounting plate of the pressing assembly can reciprocate up and down under the drive of the cylinder connected to its top. The bottom of the pressing assembly is composed of two pressing plates. The bottom end of the pressing plate can be squeezed into the material by moving downward. In order to reduce the overall interference with the material on the conveying track, the thickness of the pressing plate is relatively thin. Through two parallel horizontal screw rods, driven by a motor and a cylinder, the screw rod structure is rotated, so that the two screw nuts are moved to the sides of the area to be screened. The area to be screened is an area with a large difference in composition obtained by laser induced breakdown spectrometry. The bottom of the screw nut The part extends downward outside the screw structure, and the top of the side wall of the lower pressure plate is fixedly connected to the side wall of the screw nut. At this time, the area between the two lower pressure plates is the area that needs to be screened. Different gaps can be selected according to the amount of area that needs to be screened. That is, the first guide block under the traction of the first cylinder will move along one of the gaps. The changes in the length direction of each gap will affect the amount of material dug out and the digging depth of the area between the two lower pressure plates by the first guide block; the arc track design limits the position of the first cylinder, and each gap can be V-shaped, etc. The arc track can be understood as one of the four sections of equal length in the length direction of a circular track.

[0018] In a specific embodiment, the top wall and the bottom wall of the inner cavity of the notch are covered with bristles.

[0019] By adopting the above technical solution, since the gaps can be connected to the inner cavity of the lower pressure plate, in order to reduce the cleaning frequency of the lower pressure plate, a brush structure is installed at each gap to prevent the material from flowing into the inner cavity of the lower pressure plate in a large scale.

[0020] In a specific feasible implementation scheme, the material unloading component includes a first material trough, the length direction of the first material trough is parallel to the horizontal plane and perpendicular to the length direction of the conveying track, the first material trough passes above the conveying track on its moving path, the first material trough is a U-shaped trough, and the inner cavity of the first material trough is provided with a first material unloading guide rail and a support rod, the first material unloading guide rail is located in the middle area of ​​the first material trough, and there are two support rods, which are respectively located on both sides of the first material unloading guide rail, and a plurality of scrapers are arranged at intervals on the conveyor belt surface of the first material unloading guide rail, and the first material unloading guide rail and the support rod can both move up and down in the first material trough and in the length direction of the inner cavity of the first material trough.

[0021] By adopting the above technical scheme, when the first guide block has passed the entire length of the single notch, the connection between the first cylinder output end and the end of the first guide block is released, and the clamping claw clamps and lifts the end of the first guide block, and the lifting height will not make the lowest end of the cloth higher than the lower pressure plate, ensuring that the newly screened material will not fall from the device. When the screening operation is completed, the clamping claw clamps the first guide block, and the mounting plate and other related components begin to lift up, the clamping claw part also lifts up synchronously, and the first rollers of the cloth cabinet rotate synchronously to ensure that the cloth will not disperse during the overall rising process. When the rising height satisfies the top surface of the first material trough fixedly installed on both sides of the conveying track is lower than the bottom surface of the lower pressure plate, the first material trough begins to move in the direction of the lower pressure plate under the push of the cylinder or motor, and the first material trough moves all the way to the first. A material trough spans the entire conveying track, and the first material trough is used to receive the material below the area between the two lower pressure plates; at this time, the clamp descends or the first roller of the fabric cabinet rolls a certain amplitude first, so that the bottom end of the fabric between the clamp, the fabric cabinet and the two lower pressure plates is lower than the bottom end of the lower pressure plate, and at this time, the first material trough can be moved so that the two support rods in the first material trough can pull down and tension the fabric, so that the fabric is relatively close to the side wall of the inner cavity of the first material trough, and then the first material discharge guide rail is moved to the top of the inner cavity of the first material trough and is directly above the fabric. At this time, the first material discharge guide rail begins to move gradually downward. Since there is a scraper on the conveyor belt on the surface of the first material discharge guide rail, the material on the fabric is gradually transferred along the length direction of the first material trough during the sinking process of the first material discharge guide rail until the material on the fabric is basically scraped off.

[0022] In a specific possible implementation scheme, the clamping jaw comprises an upper and lower part, and the shape and size of the inner cavity of the clamping jaw when the upper and lower parts are buckled together match the shape and size of the first guide block.

[0023] By adopting the above technical solution, it is ensured that the first guide block will not deviate or shake during the movement of the clamping claw, thereby reducing the falling off of components such as the clamping block.

[0024] In a specific possible implementation scheme, a plurality of laser induced transmission spectrometer probes are mounted on the bottom end surface of the mounting frame, and a protective cover is disposed on the outer side of the probes.

[0025] By adopting the above technical solution, in order to reduce the mutual interference between the laser probes, the provision of a protective cover can play a certain protective and shielding role on the probe.

[0026] In a specific possible implementation scheme, the screening equipment also includes a screening drum, which is located behind the screening assembly. The screening drum includes a cylinder body with cylinders hinged at both ends. The inlet and outlet of the screening drum are oblique cuts, and the initial arrangement direction of the screening drum is flush with the direction of the conveying track.

[0027] By adopting the above technical solution, when the total amount and range of impurities to be screened out are relatively small, in order to reduce the operating pressure of the screening equipment, this screening drum will be used to quickly screen the area to be screened, and the inclined setting of the bevel cut end of the screening drum will be utilized to contact the material with a smaller contact area, so that the screening drum can be quickly inserted into the material, and the conveying track is continuously conveying, then the inclined screening drum can scrape off part of the material in the conveying track after contacting the material.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application is provided with a screening device, and by means of the detection of a laser induced breakdown spectrometer, it is identified whether there is a difference in composition of the materials passing through the target area, and the position, range and depth of the materials with differences are recorded, and then the spacing at the lower pressing plate of the screening device is adjustable to form a shoveling interval, and then a plurality of blocks are embedded through the first guide block to form a cloth of a specified width, and the cloth is used to receive the material shoveled by the first guide block. The first guide block can be matched with the length and direction of the notch according to the angle set by the first cylinder, so as to perform relatively accurate screening and removal of the target area; 2. Through the setting of the screening cylinder, it can quickly cope with the screening of a small amount of impurities in a small range. At the same time, it can also cooperate with the screening equipment in complex screening situations to improve the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial structural diagram of this application.

[0030] Figure 2 It is a structural schematic diagram of the lower pressure plate of the screening assembly of the present application.

[0031] Figure 3 It is a structural schematic diagram of the fabric component of the present application.

[0032] Figure 4 It is a structural schematic diagram of the fabric cabinet of this application.

[0033] Figure 5 It is a structural schematic diagram of the clamping jaws of this application.

[0034] Figure 6 It is a structural schematic diagram of the mounting frame of this application.

[0035] Figure 7 It is a schematic diagram of the structure inside the fabric cabinet of the present application.

[0036] Figure 8 It is a structural schematic diagram of the first guide block of the present application.

[0037] Fig. 9 This is a schematic diagram of the unloading of the screening equipment for this application Figure 1 .

[0038] Fig.10 This is a schematic diagram of the unloading of the screening equipment for this application Figure 2 .

[0039] Fig.11 It is an auxiliary tool for the screening equipment of this application.

[0040] Explanation of the reference numerals: 1. conveying track; 2. mounting frame; 3. screening assembly; 30. mounting plate; 31. lower pressure plate; 32. arc track; 33. first cylinder; 34. notch; 35. screening cylinder; 4. material distribution assembly; 40. material distribution cabinet; 41. first guide block; 42. second cylinder; 43. guide block buffer rack; 44. clamping block; 45. clamping claw; 21. protective cover; 22. probe; 46. first roller; 47. mounting block; 48. limiting hole; 49. first material discharge guide rail; 410. first material trough; 411. support rod. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 To Attachment Fig.11 This application is described in further detail.

[0042] The present application embodiment discloses a screening device using a laser induced breakdown spectrometer, referring to Figure 1 The screening device includes a conveying track 1, a mounting frame 2 and a screening component 3. The mounting frame 2 and the screening component 3 are both located above the conveying track 1. The mounting frame 2 is used to install the detection and analysis equipment. The screening component 3 includes a pressing component capable of adjusting the spacing. The pressing component can be raised and lowered. A cloth component 4 that can be towed is mounted above the pressing component. A mechanical arm is provided on the screening component 3. The clamping claw 45 on the mechanical arm is used to tow the cloth part in the cloth component 4 to between the pressing components. The screening component 3 also includes a feeding component.

[0043] It should be noted that the robot arm here can be regarded as a three-coordinate mobile platform, and the clamp 45 is fixed on the slider of this three-coordinate mobile platform; refer to Figure 1 , Figure 3 , Figure 4 and Figure 7 , The fabric assembly 4 includes a fabric cabinet 40, which can slide horizontally, and the horizontal sliding direction of the fabric cabinet 40 is perpendicular to the conveying direction of the conveying track 1. A plurality of rolls of fabric are arranged in the fabric cabinet 40, and the free ends of the fabric extend out of the fabric cabinet 40. The part of the fabric extending out of the fabric cabinet 40 is fixedly connected with a clamping block 44, and the clamping blocks 44 are arranged in a row.

[0044] The cloth cabinet 40 is used to store cloth in a buffer. When multiple rolls of cloth are rolled up in the cloth cabinet 40 and used for screening materials, a first guide block 41 is required for guidance. A slit is provided on the side wall of the cloth cabinet 40. The free ends of each cloth extend out of the cloth cabinet 40 through the slit. A clamping block 44 structure is fixedly connected to the free end of each cloth. Figure 7 In the figure, the left end of the card block 44 is a rectangular structure, and the right end of the card block 44 is an arrow structure. The cloth winding at the first roller 46 will cause the card block 44 to be subjected to a pulling force directed to the seam. A mounting block 47 is fixedly connected to the left end face of the card block 44. The mounting block 47 is a plate structure. A cylindrical structure is fixedly connected to one side of the mounting block 47 facing the arrow structure of the card block 44. A slot is provided on the card block 44 corresponding to the cylindrical structure. The free end of the cloth can be stretched to be located between the slot and the cylindrical structure first, and the free end of the cloth is embedded in the card block 44 structure through the buckling of the slot and the cylindrical structure.

[0045] refer to Figure 3 , Figure 4 and Figure 8 , The cross-sectional shapes of all the blocks 44 are identical and are all arrow-shaped. A guide block cache rack 43 is arranged outside the fabric cabinet 40. A plurality of grooves are provided in a circumferential direction inside the guide block cache rack 43. Each groove is used to store the first guide blocks 41 of different lengths. A slot is provided on the side wall of the first guide block 41. The shape of the slot matches the cross-sectional shape of the block 44. Second cylinders 42 are installed on both sides of the fabric cabinet 40. The output end of the second cylinder 42 can contact the side wall portion of the first guide block 41 in its own moving direction.

[0046] The guide block buffer rack 43 can be driven to rotate by a motor. Each first guide block 41 is initially located in the guide block buffer rack 43. According to the difference of the materials measured by the laser induced breakdown spectrometer, it is determined how much the spacing between the two lower pressing plates 31 of the screening device needs to be adjusted, and it is determined to what position the lower pressing plate 31 needs to move. The corresponding cloth cabinet 40 needs to be moved to the area where the cloth cabinet 40 is located between the two lower pressing plates 31 to ensure that the rolled or released cloth is always in a flat state. The guide block buffer rack 43 can rotate to a groove of itself and stay on the connection line between the second cylinder 42 and a row of clamping blocks 44 each time. The extension and contraction of the second cylinders 42 on both sides of the cloth cabinet 40 can adjust the position of the first guide block 41 that is commonly engaged with the clamping blocks 44, so that the first guide block 41 can be pushed back to the guide block buffer rack 43, or the first guide block 41 in the guide block buffer rack 43 can be pushed out of the guide block buffer rack 43. refer to Figure 7 , A plurality of first rollers 46 are installed in the fabric cabinet 40 . The first rollers 46 are used to roll up fabrics, and the ends of the first rollers 46 are fixedly connected to drive units.

[0047] The driving unit may be a cylinder or a motor, and the output end of the motor may be coaxially arranged with the first roller 46. refer to Figure 2 The pressing assembly includes a mounting plate 30, the top of which is fixedly connected to the output end of a cylinder, two screw structures are fixedly installed on the bottom surface of the mounting plate 30, the length direction of each screw structure is parallel to the horizontal plane and perpendicular to the conveying direction of the conveying track 1, each screw structure has a screw nut that slides back and forth in the length direction, and a lower pressing plate 31 is fixedly installed on the bottom end of each screw nut, two arc tracks 32 are installed on the top surface of the mounting plate 30, a first cylinder 33 is installed on the arc track 32, the top surface of the lower pressing plate 31 is opened, the output end of the first cylinder 33 can match and extend into the opening of the lower pressing plate 31, a plurality of notches 34 are opened on the side wall of the lower pressing plate 31 facing the other lower pressing plate 31, and a limiting hole 48 is opened on the side wall of the free end of the first guide block 41.

[0048] It should be noted that the moving direction of the circular arc track 32 is parallel to the length direction of the screw rod. In the initial state, the relative positions of the first cylinder 33 and the circular arc track 32 are fixed. Only when the length and angle of the output end of the first cylinder 33 are adjusted according to the material to be screened, the cylinder or motor components will be used to drive the first cylinder 33 and the circular arc track 32 to undergo relative displacement. The changes in the elongation and angle of the output end of the first cylinder 33 mean that each time the material is screened, the amount of material "shoveled" by the first guide block 41, the cloth, and the lower pressure plate 31 will also change. The smaller the "shovel" angle, the more concentrated the screened material is on the surface area of ​​the material.

[0049] The top and bottom walls of the inner cavity of the notch 34 are covered with bristles. Since the notch 34 is connected to the inner cavity of the lower pressing plate 31, bristles are arranged here to limit the material from entering the inner cavity of the lower pressing plate 31 through the relatively dense bristles at the notch 34, so as to prevent the material from being squeezed into the inner cavity of the lower pressing plate 31 excessively, thereby affecting the normal movement of the output end of the first cylinder 33 in the inner cavity of the lower pressing plate 31.

[0050] refer to Fig. 9 and Fig.10 The material unloading component includes a first material trough 410, and the length direction of the first material trough 410 is parallel to the horizontal plane and perpendicular to the length direction of the conveying track 1. The first material trough 410 passes above the conveying track 1 on its moving path. The first material trough 410 is a U-shaped trough. The inner cavity of the first material trough 410 is provided with a first material unloading guide rail 49 and a support rod 411. The first material unloading guide rail 49 is located in the middle area of ​​the first material trough 410. There are two support rods 411, which are respectively located on both sides of the first material unloading guide rail 49. A plurality of scrapers are arranged at intervals on the conveyor belt surface of the first material unloading guide rail 49. The first material unloading guide rail 49 and the support rod 411 can both move up and down in the first material trough 410 and in the length direction of the inner cavity of the first material trough 410.

[0051] First, the material passes through the lower pressure plate 31, the first cylinder 33, the first guide block 41 and other components at the mounting plate 30, and is screened out by the first guide block 41, the cloth, and the lower pressure plate 31 to form a net bag structure or a shovel structure. At this time, the mounting plate 30 is lifted by the cylinder, and the two lower pressure plates 31 are also lifted up. At this time, the clamp 45 rises, and the cloth is tightened to achieve the overall lifting of the net bag structure. The lifting at this time is to enable the screened material in the net bag structure to be transferred to the first material trough 410.

[0052] The first material trough 410 first moves horizontally to the bottom of the lower pressing plate 31, and the top of the first material trough 410 and the bottom surface of the lower pressing plate 31 may be in contact or in a supporting relationship. At this time, the first roller 46 of the cloth cabinet 40 is driven by the motor and begins to be slowly released, and the bottom end of the cloth gradually drops below the lower pressing plate 31. At this time, some materials may fall into the first material trough 410. At this time, the first material trough 410 can be moved horizontally for a distance, so that in the subsequent process of being stretched and pressed down by the support rod 411, the cloth only fits the side wall of the inner cavity of the first material trough 410, and there is no material in the area of ​​the cloth that is released from the first material trough 410. The clamp 45 includes an upper and a lower part. The shape and size of the inner cavity of the clamp 45 when the upper and lower parts are buckled match the shape and size of the first guide block 41. The clamp 45 here uses a three-coordinate mobile platform, so that the clamp 45 can move between the above-mentioned multiple devices and components. refer to Figure 6 A plurality of laser induced transmission spectrometer probes 22 are mounted on the bottom end surface of the mounting frame 2 , and a protective cover 21 is arranged outside the probe 22 . The protective cover 21 is in a square tube shape.

[0053] refer to Fig.11 The screening equipment also includes a screening drum 35, which is located behind the screening assembly 3. The screening drum 35 includes a cylinder body with cylinders hinged at both ends. The inlet and outlet of the screening drum 35 are oblique cuts, and the initial arrangement direction of the screening drum 35 is aligned with the direction of the conveying track 1.

[0054] It should be noted that the screening drum 35 here is located at the rear of the screening component 3, which means that the material first passes through the laser induced breakdown spectrometer. After detection, the system will mark the corresponding areas with abnormal components or large differences. Then, the material will be continuously pushed forward by the conveying track 1. The material will be screened by the screening equipment. Usually, the amount of material screened here is relatively large. When dealing with fragmented or low-concentration impurities, this screening drum 35 is set. The top of the screening drum 35 is a lifting mechanism, the middle is two cylinders, and the bottom is an oblique cut screen drum. The lifting structure at the top can greatly control the height of the screening drum 35. The two cylinders in the middle are respectively hinged on the side walls of the front and rear sections of the screening drum 35. When the body of the screening drum 35 is parallel to the horizontal plane, the left cylinder can be extended downward so that the screening drum 35 can contact the material with the oblique cut end. The screening drum 35 can be tilted and screened and taken out of the material with the help of the cylinders hinged at both ends of the side walls. When the screened material stays in the screening drum 35, the cylinder at the right end of the screening drum 35 is extended upward so that the mouth of the screening drum 35 faces upward, and a first material trough 410 can also be provided at the screening drum 35 for unloading the screening drum 35.

[0055] By using the screening equipment and the screening drum 35 together, most of the materials in the marked area on the conveying track 1 can be screened, thereby improving the quality of the product, facilitating efficient subsequent testing and processing, and avoiding unnecessary energy loss.

[0056] The implementation principle of the embodiment of the present application is as follows: first, the material on the conveying track 1 is detected and analyzed for composition by laser induced breakdown spectroscopy, and the area with abnormal composition is marked. Then, when the material in this area moves to the screening equipment area, the left and right areas are first limited by two lower pressing plates 31, and the upper first guide block 41 is embedded with multiple blocks 44 to drag a nearly whole piece of cloth formed by multiple blocks 44. The clamp 45 pulls the first guide block 41 down to the notch 34, and the output end of the first cylinder 33 is clamped with the end of the first guide block 41 at the notch 34. Under the extension and retraction of the first cylinder 33, the movement of the first cylinder 33 on the arc track 32 and The length of the notch 34 allows the first guide block 41 to disturb the surface of the material. The disturbed material will be scooped up by the shovel-like structure formed by the first guide block 41 and the pulled fabrics, and as the mounting plate 30 and other components rise, this part of the screened material stays in the area surrounded by the fabric and the lower pressure plate 31. At this time, the transfer of the screened material can be completed through the first material trough 410, the support rod 411, etc. In addition, a screening drum 35 is also provided in the rear area of ​​the screening component 3, which can quickly clean tiny, small amounts of shallow impurities that need to be removed. The cooperation of the screening drum 35 and the screening component 3 can greatly improve the screening efficiency.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A screening device using a laser induced breakdown spectrometer, characterized in that: The screening device comprises a conveying track (1), a mounting frame (2) and a screening assembly (3), wherein the mounting frame (2) and the screening assembly (3) are both located above the conveying track (1), the mounting frame (2) is used to install a detection and analysis device, the screening assembly (3) comprises a pressing assembly capable of adjusting the spacing, the pressing assembly being capable of being raised and lowered, a material distribution assembly (4) capable of being pulled is arranged above the pressing assembly, a mechanical arm is arranged on the screening assembly (3), a clamping claw (45) on the mechanical arm is used to pull a material portion in the material distribution assembly (4) between the pressing assemblies, and the screening assembly (3) further comprises a material discharging assembly.

2. The screening device using laser induced breakdown spectrometry according to claim 1, characterized in that: The fabric assembly (4) comprises a fabric cabinet (40), the fabric cabinet (40) being capable of sliding horizontally, and the horizontal sliding direction of the fabric cabinet (40) being perpendicular to the conveying direction of the conveying track (1), a plurality of rolls of fabric being arranged in the fabric cabinet (40), the free ends of the fabrics extending out of the fabric cabinet (40), and the portions of the fabrics extending out of the fabric cabinet (40) being fixedly connected with clamping blocks (44), the clamping blocks (44) being arranged in a row.

3. The screening device using laser induced breakdown spectrometry according to claim 2, characterized in that: The cross-sectional shapes of all the blocks (44) are the same and are all arrow-shaped. A guide block buffer rack (43) is arranged outside the material distribution cabinet (40). A plurality of grooves are provided in a circular direction inside the guide block buffer rack (43). Each groove is used to store first guide blocks (41) of different lengths. A slot is provided on the side wall of the first guide block (41). The shape of the slot matches the cross-sectional shape of the block (44). Second cylinders (42) are installed on both sides of the material distribution cabinet (40). The output end of the second cylinder (42) can contact the side wall of the first guide block (41) in its own moving direction.

4. The screening device using laser induced breakdown spectrometry according to claim 2, characterized in that: A plurality of first rollers (46) are installed in the fabric cabinet (40), the first rollers (46) being used to roll up fabric, and the ends of the first rollers (46) being fixedly connected to a driving unit.

5. The screening device using laser induced breakdown spectrometry according to claim 2, characterized in that: The pressing assembly comprises a mounting plate (30), the top of the mounting plate (30) is fixedly connected to the output end of a cylinder, two screw rod structures are fixedly mounted on the bottom end surface of the mounting plate (30), the length direction of each screw rod structure is parallel to the horizontal plane and perpendicular to the conveying direction of the conveying track (1), each screw rod structure has a screw rod nut that reciprocates in the length direction, and a lower pressing plate (31) is fixedly mounted on the bottom end of each screw rod nut, two arc tracks (32) are mounted on the top end surface of the mounting plate (30), a first cylinder (33) is mounted on the arc track (32), the top end surface of the lower pressing plate (31) is open, the output end of the first cylinder (33) can match and extend into the opening of the lower pressing plate (31), a plurality of notches (34) are opened on the side wall of the lower pressing plate (31) facing the other lower pressing plate (31), and a limiting hole (48) is opened on the side wall of the free end of the first guide block (41).

6. The screening device using laser induced breakdown spectrometry according to claim 5, characterized in that: The top wall and the bottom wall of the inner cavity of the notch (34) are covered with bristles.

7. The screening device using laser induced breakdown spectrometry according to claim 1, characterized in that: The material discharge assembly comprises a first material trough (410), the length direction of the first material trough (410) is parallel to the horizontal plane and perpendicular to the length direction of the conveying track (1), the first material trough (410) passes above the conveying track (1) on its moving path, the first material trough (410) is a U-shaped trough, the inner cavity of the first material trough (410) is provided with a first material discharge guide rail (49) and a support rod (411), the first material discharge guide rail (49) is located in the middle area of ​​the first material trough (410), there are two support rods (411), which are respectively located on both sides of the first material discharge guide rail (49), a plurality of scrapers are arranged at intervals on the conveying belt surface of the first material discharge guide rail (49), and the first material discharge guide rail (49) and the support rod (411) can both move up and down in the first material trough (410) and in the length direction of the inner cavity of the first material trough (410).

8. The screening device using laser induced breakdown spectrometry according to claim 1, characterized in that: The clamping jaw (45) comprises an upper and lower part, and the shape and size of the inner cavity of the clamping jaw (45) when the upper and lower parts are buckled together match the shape and size of the first guide block (41).

9. The screening device using laser induced breakdown spectrometry according to claim 1, characterized in that: A plurality of laser induced transmission spectrometer probes (22) are mounted on the bottom end surface of the mounting frame (2), and a protective cover (21) is arranged on the outside of the probes (22).

10. The screening device using laser induced breakdown spectrometry according to claim 1, characterized in that: The screening device further comprises a screening drum (35), wherein the screening drum (35) is located at the rear of the screening assembly (3), and comprises a cylinder body with cylinders hinged at both ends, the inlet and outlet of the screening drum (35) are oblique cuts, and the initial arrangement direction of the screening drum (35) is aligned with the direction of the conveying track (1).

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