Granular grain size detection device

Abstract

The invention relates to the technical field of grain size physical detection, in particular to a grain size detection device for granular grains. A grading screening structure for grading and screening particle sizes of granular grains is assembled on the machine body; a grading conveying structure; the corresponding grading screening structure is assembled on the supporting frame; the grading screening structure is provided with a circulating extraction structure corresponding to the grading conveying structure in position. The grading screening structure comprises a screening box fixedly arranged on the supporting frame. According to the multi-stage grain screening device, a multi-stage screening net structure is adopted, and fine screening of granular grains is achieved. A circulating extraction structure is introduced, automatic re-screening of particles which do not pass detection is achieved, the anti-blocking cleaning function of the aperture of a screening net is added, the stability, reliability and application prospects of the system are improved, and the system is suitable for particle size detection of various granular grains, has wide application prospects and is suitable for popularization and application. The method has important application value in the fields of grain processing, storage, transportation and the like.

Description

Technical Field

[0001] The invention relates to the technical field of physical detection of grain particle sizes, and in particular to a device for detecting the particle size of granular grains. Background Art

[0002] At present, grain detection methods include laboratory detection and production line chute detection. Laboratory detection is to bring grain samples to the laboratory and analyze the detection data; the production line chute is to install a chute on the production line, and the grain sample slides along the chute to the external detection equipment for detection. A Chinese patent discloses a grain detection device (Announcement No. CN112551031B), which discloses a grain detection device, which includes a feeding device, a conveying device, a detection device and a reflux device. The feeding end of the feeding device extends into the feeding pipe and is used to receive the grain falling from the feeding pipe; the conveying device is arranged at the feeding end of the feeding device, and the conveying device is used to receive the grain conveyed by the feeding device and to transport the grain; the detection end of the detection device is arranged toward the conveying surface of the conveying device and is used to detect the grain on the conveying device; the feeding end of the reflux device is connected to the feeding end of the conveying device, and the feeding end of the reflux device is connected to the feeding pipe, and the reflux device is used to transport the grain after the detection is completed back to the feeding pipe. When the grain inspection is completed, the reflux device automatically transports the inspected grain to the feed pipe, thus realizing the mechanized reflux of grain without the need for manual transportation, thus increasing production efficiency. This patented technology solves the problem that in the actual inspection process, the inspected grain needs to be manually transported back to the production line, which is labor-intensive and has low production efficiency.

[0003] However, in the existing technology, the particle size of grain during storage is a key factor affecting the storage, transportation, processing and eating quality of grain. Through particle size detection, the particle size distribution of grain can be understood, which provides a basis for grain grading, processing and quality control. It is necessary to solve the problem of efficient grading and detection of grain particle size in the existing technology.

[0004] Therefore, those skilled in the art provide a device for detecting the particle size of granular grains to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides: A particle size detection device for granular grains, comprising: The support frame is equipped with a grading screening structure for grading and screening the particle size of granular grains; The graded conveying structure; the corresponding graded screening structure is assembled on the support frame; The graded screening structure is equipped with a circulating extraction structure corresponding to the position of the graded conveying structure; The graded screening structure comprises a screening box fixedly arranged on a supporting frame, and a vibrating frame and a lifting frame are vertically slidably arranged inside the screening box; The inner side of the vibration frame is detachably equipped with a primary screening net, a secondary screening net and a tertiary screening net located inside the screening box; The inner side of the lifting frame is fixedly equipped with a lifting frame located in the screening box and respectively arranged below the primary screening net, the secondary screening net and the tertiary screening net. The lifting frame is equipped with an anti-blocking cone rod for discharging granular grain blocked in the apertures of the primary screening net, the secondary screening net and the tertiary screening net.

[0006] Preferably: a top frame box is integrally fixed to the top of the screening box, and the top of the vibration frame rotates and penetrates the inner wall of the screening box, and a plurality of vibration frame reset springs are installed between the top and the screening box; An eccentric shaft is tightly arranged in the middle of the vibration frame, and the eccentric shaft is connected to a bidirectional motor assembled on the inner side of the top frame box, and a bevel gear 1 is fixedly installed on the output end of the bidirectional motor away from the eccentric shaft.

[0007] Preferably: the bevel gear 1 is meshed with the bevel gear 2, and a transmission rod is fixedly mounted on the bottom of the bevel gear 2, a side protective shell fixedly mounted on the outer wall of the screening box is provided on the outer side of the bevel gear 2, and the transmission rod is rotatably mounted on the inner side of the side protective shell; The bottom end of the transmission rod is fixedly equipped with a bevel gear three.

[0008] Preferably: a first-level lower hopper is provided on the side of the screening box corresponding to the position of the first-level screening net; A corresponding secondary screening net position is arranged below the primary lower hopper, and the secondary lower hopper is connected through and fixed on the side of the screening box.

[0009] A corresponding third-level screening net position is arranged below the second-level lower hopper, and the third-level lower hopper is connected to the side of the screening box; The inner side of the bottom end of the screening box is in an inclined shape, and a four-stage lower hopper is fixed through one end of the bottom of the inclined surface.

[0010] Preferably: a feed hopper for feeding granular grain is installed through the top of the screening box, and the bottom end of the lifting frame vertically slides through the bottom of the screening box, and a cylinder 1 is installed between the lifting frame and the screening box.

[0011] Preferably: the graded conveying structure includes four graded conveying frames respectively arranged at the bottom of the first-level lower hopper, the second-level lower hopper, the third-level lower hopper and the fourth-level lower hopper, a driven rod is rotatably mounted on the inner side of one end of the graded conveying frame, and a transmission roller located on the inner side of the four graded conveying frames is fixedly arranged on the outer wall of the driven rod.

[0012] Preferably: the outer side of the driving roller is sleeved with a conveyor belt located inside the grading conveyor frame; One end of the driven rod rotates and penetrates the inner wall of the grading conveying frame, and is fixed with a bevel gear four; The other end of the driven rod rotates and penetrates the inner wall of the grading conveying frame, and is fixed with a bevel gear five meshing with the bevel gear three.

[0013] Preferably, a controller is installed on the front side wall of the support frame, and the controller is electrically connected to a control screen.

[0014] Preferably: four detectors are arranged on the support frame corresponding to the four grading conveying frames, and a detection frame fixedly arranged on the support frame is installed on the outer wall of the detector.

[0015] Preferably: a bottom side frame supporting four grading conveying frames is fixed on the side of the support frame.

[0016] Technical effects and advantages of the present invention: In the present invention, during the screening process, granular grains enter the screening box through the feed hopper, are screened in sequence through the primary, secondary and tertiary screening nets, and particles of different particle sizes are discharged through different lower hoppers. For vibration screening, a bidirectional motor drives the eccentric shaft to rotate, causing the vibration frame to vibrate up and down, thereby driving the screening net to vibrate, thereby realizing particle screening, conveying and testing. The screened particles are transported through a conveyor belt, and a detector is used to detect whether the particle size is qualified. Qualified particles are discharged, and unqualified particles enter a circulating extraction structure.

[0017] The present invention improves the efficiency and accuracy of particle size detection of granular grains, realizes automatic re-screening of particles that fail the detection through a cyclic extraction structure, reduces manual intervention, and has an anti-clogging and cleaning function for the aperture of the screening mesh, thereby ensuring the continuity and stability of screening. The present invention has a high degree of automation, and the entire system realizes automated operation through automated components such as motors and cylinders.

[0018] The present invention adopts a multi-level screening net structure to achieve fine screening of granular grains. A circulating extraction structure is introduced to achieve automatic re-screening of particles that fail to pass the test, and the anti-blocking and cleaning function of the screening net aperture is added, which improves the stability and reliability of the system. The system is suitable for particle size detection of various granular grains, has a wide range of application prospects, and has important application value in the fields of grain processing, storage, transportation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a particle size detection device for granular grains provided by the present application; Figure 2 It is a schematic diagram of the front structure of a particle size detection device for granular grains provided by the present application; Figure 3 This is a schematic diagram of the structure of a particle size detection device for granular grains provided by the present application, viewed from above; Figure 4 This is a schematic diagram of the structure of a particle size detection device for granular grains provided by the present application; Figure 5 It is a structural schematic diagram of a grading and screening structure in a particle size detection device for granular grains provided by the present application; Figure 6 This application provides a particle size detection device for granular grains. Figure 5 The structural diagram at A in the middle; Figure 7 This application provides a particle size detection device for granular grains. Figure 5 The structural diagram at B in the middle; Figure 8 It is a structural schematic diagram of a vibration frame in a particle size detection device for granular grains provided by the present application; Fig. 9 It is a structural schematic diagram of a lifting frame in a particle size detection device for granular grains provided by the present application; Fig.10 It is a schematic diagram of the cross-sectional structure of a screening box in a particle size detection device for granular grains provided by the present application; Fig.11 It is a structural schematic diagram of a grading conveying structure in a particle size detection device for granular grains provided by the present application; Fig.12 It is a structural schematic diagram of a cyclic extraction structure in a particle size detection device for granular grains provided by the present application; Fig.13 This application provides a particle size detection device for granular grains. Fig.12 Schematic diagram of the structure at C in the middle.

[0020] In the figure: 1. Support frame; 2. Grading screening structure; 201. Screening box; 202. Top frame box; 203. Feed hopper; 204. Vibrating frame; 205. Primary screening net; 206. Secondary screening net; 207. Third-level screening net; 208. Spring; 209. Eccentric shaft; 210. Bidirectional motor; 211. Bevel gear 1; 212. Bevel gear 2; 213. Transmission rod; 214. Bevel gear 3; 215. Side shield; 216. Primary lower hopper; 217. Secondary lower hopper; 218. Third-level lower hopper; 219. Lifting frame; 220. Lifting frame; 221. Anti-blocking cone rod; 222. Fourth-level lower hopper; 223. Cylinder 1; 3. Grading conveying structure; 301. Grading conveying frame; 302. Driven rod; 303. Transmission roller; 304. Conveyor belt; 305. Bevel gear 4; 306. Bevel gear 5; 307. Grading discharge hopper; 308. Top sealing frame; 309. Limiting plate; 310. Cylinder 2; 4. Circulation extraction structure; 401. Extraction rack; 402. Extraction pipe; 403. Concentration pipe; 404. Dust extraction machine; 405. Exhaust pipe; 406. Circulation pipe; 407. Vertical auger; 408. Bevel gear six; 409. Fixed rack; 410. Solenoid valve; 5. Controller; 6. Control panel; 7. Detection frame; 8. Detector; 9. Bottom side frame; 10. Load-bearing frame. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The examples of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific uses.

[0022] For example, see Figure 1 to Figure 4 In this embodiment, a particle size detection device for granular grains is provided, comprising: a support frame 1; a grading screening structure 2 for grading and screening the particle size of granular grains is mounted on the support frame; the grading screening structure 2 is used to grade and screen grains of different granular types in sequence for efficient classification; The grading conveying structure 3 is mounted on the support frame 1 corresponding to the grading screening structure 2; the grading conveying structure 3 is used to convey and classify the grain granules screened by the grading screening structure 2; The grading screening structure 2 is equipped with a circulating extraction structure 4 corresponding to the position of the grading conveying structure 3; the circulating extraction structure 4 is used to synchronously extract and circulate the grains conveyed in the grading conveying structure 3 to the grading screening structure 2 for re-screening when the grains are detected to be unqualified; A controller 5 is installed on the front side wall of the support frame 1, and the controller 5 is electrically connected to a control screen 6. The controller 5 is used to connect and control the graded screening structure 2, the graded conveying structure 3 and the circulating extraction structure 4.

[0023] Four detectors 8 are arranged on the support frame 1 corresponding to the four grading conveying frames 301, and a detection frame 7 fixedly arranged on the support frame 1 is installed on the outer wall of the detector 8. The detector 8 is specifically a camera sensor for video monitoring of grain particles.

[0024] A bottom side frame 9 supporting four grading conveying frames 301 is fixed to the side of the support frame 1. A load-bearing frame 10 supporting the other side wall of the screening box 201 is integrally fixed to the support frame 1.

[0025] For example 2, please refer to Figures 5 to 10 In this embodiment, a grading and screening structure 2 in a particle size detection device for granular grains is provided; The graded screening structure 2 includes a screening box 201 fixedly arranged on the support frame 1, and a vibrating frame 204 and a lifting frame 219 are vertically slidably arranged inside the screening box 201; The vibration frame 204 and the lifting frame 219 are both slidably arranged on the inner wall of the screening box 201; The vibration frame 204 is detachably provided with a primary screening net 205, a secondary screening net 206 and a tertiary screening net 207 located inside the screening box 201; The screening apertures of the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 are all different, and the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 with different apertures can be assembled according to the type of grain particles; A lifting frame 220 is fixedly installed on the inner side of the lifting frame 219, which is located in the screening box 201 and is respectively arranged below the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207. The lifting frame 220 is equipped with an anti-blocking cone rod 221 for discharging granular grain blocked in the apertures of the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207.

[0026] The anti-blocking cone rod 221 has the same specifications and an outer diameter smaller than the third-level screening net 207. When the anti-blocking cone rod 221 moves, it can clean the granular grains blocked in the apertures of the first-level screening net 205, the second-level screening net 206 and the third-level screening net 207.

[0027] The top of the screening box 201 is integrally fixed with a top frame box 202, and the top of the vibration frame 204 rotates and penetrates the inner wall of the screening box 201, and a plurality of springs 208 for resetting the vibration frame 204 are installed between the screening box 201; An eccentric shaft 209 is tightly installed in the middle of the vibration frame 204, and the eccentric shaft 209 is connected to a bidirectional motor 210 assembled on the inner side of the top frame box 202. The specific model of the bidirectional motor 210 is 70TYYZ, and a bevel gear 211 is fixedly installed at the output end of the bidirectional motor 210 away from the eccentric shaft 209.

[0028] The bevel gear 1 211 is meshed with the bevel gear 212, and a transmission rod 213 is fixedly mounted on the bottom of the bevel gear 212. A side protective shell 215 fixedly mounted on the outer wall of the screening box 201 is provided on the outer side of the bevel gear 212, and the transmission rod 213 is rotatably mounted on the inner side of the side protective shell 215. The bottom end of the transmission rod 213 is fixedly equipped with a bevel gear 3 214 .

[0029] The second bevel gear 212 and the third bevel gear 214 are both located inside the side protective shell 215 .

[0030] A first-level lower hopper 216 is provided on the side of the screening box 201 corresponding to the position of the first-level screening net 205 ; the first-level lower hopper 216 is used to discharge the residual grain particles screened by the first-level screening net 205 inside the screening box 201 .

[0031] A secondary lower hopper 217 corresponding to the position of the secondary screening net 206 is provided below the primary lower hopper 216 and is connected through and fixed to the side of the screening box 201 ; the secondary lower hopper 217 is used to discharge the grain particles screened by the secondary screening net 206 inside the screening box 201 .

[0032] A position corresponding to the third-level screening net 207 is provided below the second-level lower hopper 217, and a third-level lower hopper 218 is fixed on the side of the screening box 201 through the third-level lower hopper 218; the third-level lower hopper 218 is used to discharge the residual grain particles screened by the third-level screening net 207 inside the screening box 201.

[0033] The inner side of the bottom end of the screening box 201 is in the shape of an inclined plane, and a four-stage lower hopper 222 is fixed through one end of the bottom of the inclined plane. The four-stage lower hopper 222 is used to discharge the grain particles after the three-stage lower hopper 218 passes outside the screening box 201.

[0034] The top of the screening box 201 is provided with a feed hopper 203 for feeding granular grains, and the bottom of the lifting frame 219 vertically slides through the bottom of the screening box 201, and a cylinder 223 is provided between the lifting frame 219 and the screening box 201. The cylinder 223 is used to actively adjust the height position of the lifting frame 219 inside the screening box 201, and the specific model of the cylinder 223 is CY1S25.

[0035] For example 3, please refer to Fig.11 In this embodiment, a grading conveying structure 3 in a particle size detection device for granular grains is provided; The graded conveying structure 3 includes four graded conveying frames 301 respectively arranged at the bottom of the first-stage lower hopper 216, the second-stage lower hopper 217, the third-stage lower hopper 218 and the fourth-stage lower hopper 222. A driven rod 302 is rotatably mounted on the inner side of one end of the graded conveying frame 301, and a transmission roller 303 located on the inner side of the four graded conveying frames 301 is fixedly arranged on the outer wall of the driven rod 302.

[0036] The outer side of the transmission roller 303 is sleeved with a conveyor belt 304 located inside the grading conveyor frame 301, and the inner sides of both ends of the conveyor belt 304 are provided with transmission rollers 303, and the transmission roller 303 at one end of the conveyor belt 304 away from the driven rod 302 is rotatably assembled inside the grading conveyor frame 301; One end of the driven rod 302 rotates and penetrates the inner wall of the grading conveying frame 301, and is fixed with a bevel gear 4 305; The other end of the driven rod 302 rotates and penetrates the inner wall of the grading conveying frame 301 , and is fixed with a bevel gear 5 306 meshing with the bevel gear 3 214 .

[0037] A grading discharge hopper 307 for discharging granular grain is integrally fixed at the bottom of one end of each of the four grading conveying racks 301; A top sealing frame 308 is fixedly mounted on the top of the other end of each of the four grading conveying frames 301 , and a second cylinder 310 is installed on the top sealing frame 308 . A limiting plate 309 located on the inner side of the grading conveying frame 301 is installed at the output end of the second cylinder 310 .

[0038] Example 4, please refer to Figures 12-13 In this embodiment, a cyclic extraction structure 4 in a particle size detection device for granular grains is provided; The circulating extraction structure 4 includes an extraction frame 401 fixedly mounted on the side wall of the detection frame 7, an extraction pipe 402 located inside the four graded conveying frames 301 is installed inside the extraction frame 401, a centralizing pipe 403 is connected to the top of the extraction pipe 402, a solenoid valve 410 is installed inside the extraction pipe 402, and one end of the centralizing pipe 403 is connected to a dust extraction machine 404, and the discharge end of the dust extraction machine 404 is connected to a discharge pipe 405; One end of the discharge pipe 405 is connected to a circulation pipe 406, and a vertical auger 407 is rotatably mounted inside the circulation pipe 406. The bottom end of the vertical auger 407 rotates and penetrates the outside of the circulation pipe 406, and a bevel gear 6 408 meshing with the bevel gear 4 305 is fixedly arranged; The top of the circulation pipe 406 is connected to the feed hopper 203; A fixing frame 409 is fixedly mounted between the circulation pipe 406 and the screening box 201 .

[0039] According to the above embodiments, the working principle of the present invention is: When the particle size of granular grain is detected, it is first subjected to grading and screening processing by the grading and screening structure 2; The grains are then passed through the classification conveying structure 3 for particle size detection during the conveying movement, and the grains that pass the detection are collected, while the grains that fail the detection are re-distributed into the classification screening structure 2 through the circulation extraction structure 4 for re-classification and screening processing; When the grading screening structure 2 performs grading screening for granular grains, the granular grains are placed into the screening box 201 through the feed hopper 203, so that the granular grains fall into the primary screening net 205 inside the screening box 201, and the granular grains are screened through the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207; When the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 are vibrating and screening the granular grains, the bidirectional motor 210 is started. After the bidirectional motor 210 is started, the eccentric shaft 209 is driven to rotate between the screening box 201 and the vibration frame 204. The rotating eccentric shaft 209 can perform a cyclic vibration treatment on the vibration frame 204, so that the vibration frame 204 is compressed and rebounded by the spring 208, and the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 assembled on the vibration frame 204 vibrate up and down inside the screening box 201, and the granular grains are vibrated and screened in sequence through the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207, and the granular grains passing through the primary screening net 205 fall into the secondary screening net 206, and the granular grains that do not pass through the primary screening net 205 are discharged through the primary lower hopper 216; The grains that fall into the secondary screening net 206 and pass through fall on the tertiary screening net 207, while the grains that do not pass through the secondary screening net 206 are discharged through the secondary lower hopper 217; The grains falling on the three-stage screening net 207 are divided into those that pass and those that do not. The grains that pass the three-stage screening net 207 are discharged through the four-stage lower hopper 222, and the grains that do not pass the three-stage screening net 207 are discharged through the three-stage lower hopper 218. There is a height at which the eccentric shaft 209 is in a vertical state between the first-stage lower hopper 216, the second-stage lower hopper 217 and the third-stage lower hopper 218 and the first-stage screening net 205, the second-stage screening net 206 and the third-stage screening net 207, respectively, so that the unscreened granular grains can be prevented from falling into the first-stage lower hopper 216, the second-stage lower hopper 217 and the third-stage lower hopper 218; When the apertures inside the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 are cleaned to prevent clogging, the cylinder 223 is started, and the cylinder 223 is retracted after being started, so that the lifting frame 219 can be moved inside the screening box 201, and the anti-clogging cone rod 221 on the lifting frame 219 can be raised to the apertures of the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207, so that the blocked apertures inside the primary screening net 205, the secondary screening net 206 and the tertiary screening net 207 can be cleaned; When the bidirectional motor 210 rotates, it drives the bevel gear 1 211 to rotate, and the rotating bevel gear 1 211 meshes with the bevel gear 212 to rotate, so that the transmission rod 213 fixedly assembled at the bottom of the bevel gear 212 continues to rotate, and the transmission rod 213 drives the bevel gear 3 214 to rotate, and the bevel gear 3 214 meshes with the bevel gear 5 306, and drives the driven rod 302 to rotate, and the transmission roller 303 on the driven rod 302 moves the conveyor belt 304, and the granular grains dropped from the first-stage lower hopper 216, the second-stage lower hopper 217 and the third-stage lower hopper 218 can be classified and fall on the conveyor belt 304 of the grading conveying frame 301, so that the graded granular grains can be transmitted; When the transmitted granular grain is limited, by starting the second cylinder 310, the height between the limit plate 309 and the conveyor belt 304 can be adjusted by the second cylinder 310, so that the granular grain can be laid flat on the conveyor belt 304 of the grading conveyor frame 301 according to the radial direction of the conveyed granular grain. When the granular grain passes through the detector 8, the detection picture is transmitted to the controller 5 to analyze whether the radial direction of the granular grain is qualified. The qualified granular grain is discharged through the grading discharge hopper 307; The qualified granular grain is extracted by the activated vacuum extractor 404, so that the wind passes through the extraction pipe 402 to extract the grain that does not meet the particle size, and is discharged into the circulation pipe 406 connected to the discharge pipe 405 along the collecting pipe 403. The continuously rotating driven rod 302 will mesh with the bevel gear 6 408 through the rotating bevel gear 4 305, and the meshing bevel gear 6 408 drives the vertical auger 407 to rotate in the circulation pipe 406, so that the grain that meets the particle size can be directly discharged into the feed hopper 203, so that the grain can be re-screened through the grading and screening structure 2.

[0040] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A particle size detection device for granular grains, characterized in that: include: A support frame (1) is provided with a grading screening structure (2) for grading and screening the particle size of granular grains; A graded conveying structure (3); and a corresponding graded screening structure (2) assembled on the support frame (1); The grading screening structure (2) is equipped with a circulating extraction structure (4) corresponding to the position of the grading conveying structure (3); The graded screening structure (2) comprises a screening box (201) fixedly arranged on a support frame (1), and a vibrating frame (204) and a lifting frame (219) are vertically slidably arranged inside the screening box (201); The vibration frame (204) is detachably provided with a primary screening net (205), a secondary screening net (206) and a tertiary screening net (207) located inside the screening box (201); The lifting frame (219) is fixedly provided with a lifting frame (220) located in the screening box (201) and arranged below the primary screening net (205), the secondary screening net (206) and the tertiary screening net (207), respectively. The lifting frame (220) is provided with an anti-blocking cone rod (221) for discharging grain particles blocked in the apertures of the primary screening net (205), the secondary screening net (206) and the tertiary screening net (207).

2. A particle size detection device for granular grains according to claim 1, characterized in that: A top frame box (202) is integrally fixed to the top of the screening box (201), and the top of the vibration frame (204) rotates and penetrates the inner wall of the screening box (201), and a plurality of springs (208) for resetting the vibration frame (204) are installed between the vibration frame and the screening box (201); An eccentric shaft (209) is tightly disposed in the middle of the vibration frame (204); the eccentric shaft (209) is connected to a bidirectional motor (210) mounted on the inner side of the top frame box (202); a bevel gear 1 (211) is fixedly mounted on the output end of the bidirectional motor (210) away from the eccentric shaft (209).

3. A particle size detection device for granular grains according to claim 2, characterized in that: The bevel gear 1 (211) is meshed with the bevel gear 2 (212), and a transmission rod (213) is fixedly mounted on the bottom of the bevel gear 2 (212), a side protective shell (215) fixedly mounted on the outer wall of the screening box (201) is provided on the outer side of the bevel gear 2 (212), and the transmission rod (213) is rotatably mounted on the inner side of the side protective shell (215); A bevel gear three (214) is fixedly mounted on the bottom end of the transmission rod (213).

4. The device for detecting the particle size of granular grains according to claim 2, characterized in that: A first-stage lower hopper (216) is provided on the side of the screening box (201) at a position corresponding to the first-stage screening net (205); A position corresponding to the secondary screening net (206) is provided below the primary lower hopper (216), and the secondary lower hopper (217) is connected to and fixed on the side of the screening box (201); A position corresponding to the third-stage screening net (207) is provided below the second-stage lower hopper (217), and the third-stage lower hopper (218) is connected to and fixed on the side of the screening box (201); The inner side of the bottom end of the screening box (201) is in the shape of an inclined surface, and a four-stage lower hopper (222) is fixedly passed through one end of the bottom of the inclined surface.

5. The device for detecting particle size of granular grains according to claim 1, characterized in that: The top of the screening box (201) is penetrated by a feeding hopper (203) for feeding granular grains, and the bottom of the lifting frame (219) vertically slides through the bottom of the screening box (201), and a cylinder 1 (223) is installed between the lifting frame (219) and the screening box (201).

6. The device for detecting particle size of granular grains according to claim 1, characterized in that: The grading conveying structure (3) comprises four grading conveying frames (301) respectively arranged at the bottom of a first-stage lower hopper (216), a second-stage lower hopper (217), a third-stage lower hopper (218) and a fourth-stage lower hopper (222); a driven rod (302) is rotatably mounted on the inner side of one end of the grading conveying frame (301); and a driving roller (303) located on the inner side of the four grading conveying frames (301) is fixedly mounted on the outer wall of the driven rod (302).

7. The device for detecting the particle size of granular grains according to claim 6, characterized in that: The outer side of the driving roller (303) is sleeved with a conveyor belt (304) located on the inner side of the grading conveyor frame (301); One end of the driven rod (302) is rotatably inserted into the inner wall of the grading conveying frame (301) and is fixed with a bevel gear 4 (305); The other end of the driven rod (302) is rotatably inserted into the inner wall of the grading conveying frame (301) and is fixed with a bevel gear five (306) meshing with the bevel gear three (214).

8. The device for detecting particle size of granular grains according to claim 1, characterized in that: A controller (5) is installed on the front side wall of the support frame (1), and the controller (5) is electrically connected to a control screen (6).

9. The device for detecting the particle size of granular grains according to claim 7, characterized in that: Four detectors (8) are arranged on the support frame (1) corresponding to the four grading conveying frames (301), and a detection frame (7) fixedly arranged on the support frame (1) is installed on the outer wall of the detector (8).

10. The device for detecting particle size of granular grains according to claim 7, characterized in that: A bottom side frame (9) supporting four grading conveying frames (301) is fixed on the side of the support frame (1).

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