A grain cleaner with double air separation double dust removal closed loop system and method of use

Abstract

The present application belongs to screening equipment, more particularly to the technical field of grain cleaning, and discloses a grain cleaning machine with a double-air-venting double-dust-removing closed loop system and a use method, which comprises a base, the upper end face of the base is fixed with a conveyor and a second elevator, the first end of the second elevator is connected with the tail end of the conveyor, the tail end of the second elevator is connected with a rear air-venting chamber through a third connecting pipeline, and the bottom of the rear air-venting chamber is fixed with a discharging pipeline. The grain cleaning machine with the double-air-venting double-dust-removing closed loop system realizes the closed loop of "air-venting-dust-removing-air-venting again-dust-removing again" through the double-dust-removing design, which not only ensures the light impurity removal rate, but also avoids dust overflow, and the environmental protection and cleaning effect are greatly improved. The first screen and the second screen can remove large impurities and small impurities, respectively, the third screen, the fourth screen and the fifth screen can classify grains according to particle size, and the first screen can screen more efficiently and uniformly.

Description

Technical Field

[0001] This invention belongs to the field of screening equipment, and more specifically relates to the field of grain selection technology, specifically a grain selection machine with a double air separation and double dust removal closed-loop system and its usage method. Background Technology

[0002] Millet, also known as sorghum or foxtail millet, is an annual herb with stout stalks, few tillers, narrow lanceolate leaves with prominent midribs and veinlets, and fine hairs. It has spike-like panicles with spikelets clustered on tertiary branches. The spikelets are mostly covered with bristles. Each spike contains hundreds to thousands of grains, which are very small, about 0.1 cm in diameter. The millet spike is generally golden yellow when mature, with oval-shaped grains that are small and mostly yellow. After being hulled, it is commonly known as millet. After the millet is harvested and threshed, it needs to be screened to remove long stalks, broken stalks, and empty husks. Therefore, a grain sorting machine is required.

[0003] A typical example of a grain sorting machine in the prior art is disclosed in CN216500543U, a millet impurity removal and screening device, which includes a screening cylinder and a drive motor. The drive motor is fixedly installed at the center of one end of the screening cylinder, and a main shaft is set inside the screening cylinder. The advantages are: This utility model adopts a speed-regulating fan, a screening cylinder, and a stirring rod. During the millet screening process, the millet can be fed into the screening cylinder from the feed hopper. The drive motor drives the main shaft to rotate, thereby driving the stirring rod and the agitator plate to rotate, stirring the millet inside the screening cylinder, thus turning and dispersing the millet. At the same time, the speed-regulating fan starts, generating wind force, which blows towards the turned and dispersed millet, blowing out the broken straw and empty husks from the millet into the screening cylinder. The full millet flows out of the screening cylinder through the screening holes, while the long straw remains in the screening cylinder. The air separation and filtration are completed at the same time, eliminating the trouble of separate operation required by traditional equipment, improving work efficiency and ease of use.

[0004] The single dust removal function of existing grain cleaning machines is prone to becoming an efficiency bottleneck. The dust removal effect is not thorough enough, and the dust is easy to overflow. The environmental protection and cleaning effect are not good. At the same time, it is difficult to grade the millet by particle size while removing impurities. Summary of the Invention

[0005] The purpose of this invention is to provide a grain sorting machine and its usage method with a dual air separation and dual dust removal closed-loop system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a grain sorting machine with a closed-loop system of dual air separation and dual dust removal, comprising a base, a first elevator fixed to the upper surface of the base, a feed hopper fixed to the front end of the first elevator, a pre-air separation chamber fixed to the rear end of the first elevator, the top of the pre-air separation chamber being connected to a primary cyclone dust collector via a first connecting pipe, the bottom of the pre-air separation chamber being connected to a feed pipe via a second connecting pipe, a screening and impurity removal mechanism fixed to the bottom of the feed pipe, the screening and impurity removal mechanism comprising a screening box, a bottom frame fixed to the bottom of the screening box, a first screen, an auxiliary vibration mechanism, a first guide plate, a second screen, a second guide plate, and a material screening mechanism fixed to the inner side of the screening box, and a vibration motor fixed to the front side of the screening box; Three support seats are fixed at equal intervals on the upper surface of the base. The bottom frame is connected to the support seats through buffer springs. A conveyor and a second elevator are fixed on the upper surface of the base. The first end of the second elevator is connected to the end of the conveyor. The end of the second elevator is connected to the rear air separation chamber through a third connecting pipe. A discharge pipe is fixed at the bottom of the rear air separation chamber.

[0007] Preferably, a first waste discharge pipe is fixed to the rear side of the screening box, and the first waste discharge pipe is located between the inner top of the screening box and the first screen.

[0008] Preferably, the auxiliary vibration mechanism includes a slide rail, which is symmetrically fixed on the two inner walls of the screening box. A first motor is fixed on one inner wall of the slide rail, and the output end of the first motor is connected to a lead screw. A slider is threaded to the outer side of the lead screw and is slidably connected inside the slide rail. A baffle is fixed between the slider and the two inner walls of the slide rail. A second motor is fixed inside one of the sliders, and the output end of the second motor is connected to a rotating rod. The rotating rod is rotatably connected between the two sliders, and two extrusion rods are fixed between the two sliders.

[0009] Preferably, a first groove is evenly provided on the outer circumference of the rotating rod, and a first compression spring is fixed in the first groove. A movable rod is fixed to the outer end of the first compression spring, and a striking rod is rotatably connected to the outer end of the movable rod. The striking rod is connected to the movable rod through a first spiral spring, and a slot is provided at the inner end of the striking rod.

[0010] Preferably, the outer end of the movable rod is provided with a second groove, and a second compression spring is fixed in the second groove. The outer end of the second compression spring is fixed with a movable block, and the movable block is slidably connected in the second groove. The outer end face of the movable block is fixed with a locking block, and the locking block is engaged in the locking groove.

[0011] Preferably, the movable rod is symmetrically rotatably connected to two rotating frames on both sides of its outer end, and the rotating frames are connected to the movable rod through a second spiral spring. The inner ends of the two rotating frames are connected to the movable block through connecting ropes. A rubber sleeve is fixed between the movable rod and the striking rod, and the rubber sleeve is wrapped around the outside of the two rotating frames.

[0012] Preferably, a second waste discharge pipe is fixed to the rear side of the screening box, and the second waste discharge pipe is located between the second screen and the second guide plate.

[0013] Preferably, the material screening mechanism includes a support frame, which is fixed inside the screening box. A third screen, a fourth screen, and a fifth screen are fixed inside the support frame. A first baffle is fixed between the head of the fourth screen and the bottom of the screening box, a second baffle is fixed between the tail of the fourth screen and the bottom of the screening box, and a third baffle is fixed between the tail of the fifth screen and the bottom of the screening box. The third baffle is fixed to an inner wall of the screening box.

[0014] Preferably, the bottom of the screening box has three discharge ports, and the bottom of the screening box has three discharge channels, which are connected to the discharge ports one by one. Three discharge valves are fixed at equal intervals on one side of the screening box, and the discharge valves are connected to the discharge channels one by one.

[0015] A method of using a grain separator with a dual air separation and dual dust removal closed-loop system includes the following steps: S1. The material is fed into the feed hopper. The first elevator transports the material to the pre-air classifier chamber. The pre-air classifier chamber is responsible for the first air classification and dust removal. The first-stage cyclone dust collector collects the dust, chaff and other light impurities from the pre-air classification. S2. After the material enters the screening box, the screening box vibrates. The first screen removes large impurities such as straw and stones. The large impurities are finally discharged through the first discharge pipe. The second screen removes small impurities such as fine sand and fragments. The small impurities move along the second guide plate and are finally discharged through the second discharge pipe. S3. When the material moves along the first screen, the two sliders and the rotating rod move to the left or right. The rotating frame is first squeezed by the squeezing rod and rotates, thereby unlocking the striking rod. The striking rod is then squeezed and rotates. After the striking rod passes the squeezing rod, it automatically rotates back and bounces off with the moving rod, which facilitates automatic striking of the first screen, thereby achieving the vibration effect and making it easier to separate large impurities more efficiently. Screens S4, the third, fourth, and fifth screens grade the millet according to its particle size. Millet of different sizes is discharged through different outlets and falls into the corresponding discharge channels. Each discharge channel is matched with a discharge valve. Opening the discharge valve allows the millet of the corresponding particle size to be fed onto the conveyor. The conveyor and the second elevator transport the millet to the post-air separation chamber for a second air separation and dust removal. After the second dust removal, the millet is finally discharged through the discharge pipe and enters the next process.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This grain cleaning machine with a closed-loop dual air separation and dual dust removal system achieves dual air separation and dual dust removal through the coordinated use of the front air separation chamber and the rear air separation chamber. The front air separation chamber is responsible for the first air separation and dust removal, and the rear air separation chamber is responsible for the second air separation and dust removal. The dual dust removal design realizes a closed loop of "air separation-dust removal-re-air separation-re-dust removal", which not only ensures the removal rate of light impurities, but also avoids dust overflow, and greatly improves environmental protection and cleaning effect.

[0017] 2. This grain sorting machine with a dual-air separation and dual-dust removal closed-loop system, through the coordinated use of a screening box, a first screen, a second screen, a third screen, a fourth screen, a fifth screen, a discharge channel, a discharge valve, and a conveyor, can achieve the purpose of removing impurities of different sizes and automatic classification. After the material is dusted once, it enters the screening box. The first and second screens can remove large and small impurities respectively, while the third, fourth, and fifth screens can grade the grains according to their particle size, achieving an automatic classification effect. Grains of different sizes fall into different discharge channels, and each discharge channel is matched with a discharge valve. Opening the discharge valve allows the grains of the corresponding size to be conveyed onto the conveyor for transport.

[0018] 3. This grain sorting machine with a dual-air separation and dual-dust removal closed-loop system achieves efficient impurity removal through the coordinated use of a first screen, sliders, rotating rods, pressing rods, movable rods, striking rods, locking blocks, and rotating frame. During the removal of large impurities using the first screen, the two sliders and rotating rods move to the left or right together, while the rotating rods rotate. The rotating frame is first squeezed by the pressing rods and rotates. The locking blocks automatically unlock the striking rods, which are then squeezed and rotated, passing over the pressing rods. After passing the pressing rods, the striking rods automatically rotate back and strike the first screen. At the same time, the striking rods bounce up with the movable rods and strike the first screen, facilitating a secondary vibration effect and enabling the first screen to screen more efficiently and evenly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the connection structure between the feed pipe and the screening and impurity removal mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the auxiliary vibration mechanism of the present invention; Figure 5 This is a top view cross-sectional structural diagram of the auxiliary vibration mechanism of the present invention; Figure 6 This is a frontal cross-sectional view of the auxiliary vibration mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the connection structure of the first compression spring, movable rod, first spiral spring, striking rod, rotating frame and second spiral spring of the present invention. Figure 9 This is a schematic diagram of the material screening mechanism of the present invention; Figure 10 This is a schematic diagram of the connection structure of the screening box, the first baffle, the second baffle, the third baffle, and the discharge port of the present invention; Figure 11 This is a schematic diagram of the connection structure between the screening box and the discharge channel of the present invention.

[0020] In the diagram: 1. Base; 2. First elevator; 3. Feed hopper; 4. Pre-air separation chamber; 5. First connecting pipe; 6. First-stage cyclone dust collector; 7. Second connecting pipe; 8. Feed pipe; 9. Screening and impurity removal mechanism; 901. Screening box; 902. Base frame; 903. First screen; 904. First impurity discharge pipe; 905. Auxiliary vibration mechanism; 9051. Slide rail; 9052. First motor; 9053. Lead screw; 9054. Slider; 9055. Baffle; 9056. Second motor; 9057. Rotating rod; 9058. Extrusion rod; 9059. First groove; 90510. First compression spring; 90511. Movable rod; 90512. First spiral spring; 90513. Striking rod; 90514. Slot; 90515. Second groove; 90516 90517. Second compression spring; 90518. Movable block; 90519. Locking block; 90510. Connecting rope; 90520. Turning frame; 90521. Second spiral spring; 90522. Rubber sleeve; 906. First guide plate; 907. Second screen; 908. Second guide plate; 909. Second waste discharge pipe; 910. Material screening mechanism; 9101. Support frame; 9102. Third screen; 9103. Fourth screen; 9104. Fifth screen; 911. First stop bar; 912. Second stop bar; 913. Third stop bar; 914. Discharge port; 915. Discharge channel; 916. Discharge valve; 917. Vibrating motor; 10. Support base; 11. Conveyor; 12. Second elevator; 13. Third connecting pipe; 14. Rear air separation chamber; 15. Discharge pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-11This invention provides a technical solution: a grain sorting machine with a closed-loop system of dual air separation and dual dust removal, including a base 1, a first elevator 2 fixed to the upper surface of the base 1, a feed hopper 3 fixed to the first end of the first elevator 2, a pre-air separation chamber 4 fixed to the end of the first elevator 2, the top of the pre-air separation chamber 4 being connected to a first-stage cyclone dust collector 6 via a first connecting pipe 5, the bottom of the pre-air separation chamber 4 being connected to a feed pipe 8 via a second connecting pipe 7, a screening and impurity removal mechanism 9 fixed to the bottom of the feed pipe 8, the screening and impurity removal mechanism 9 including a screening box 901, a bottom frame 902 fixed to the bottom of the screening box 901, a first screen 903, an auxiliary vibration mechanism 905, a first guide plate 906, a second screen 907, a second guide plate 908 and a material screening mechanism 910 fixed to the inner side of the screening box 901, and a vibration motor 917 fixed to the front side of the screening box 901.

[0023] Three support seats 10 are fixed at equal intervals on the upper surface of the base 1. The bottom frame 902 is connected to the support seats 10 through buffer springs. A conveyor 11 and a second elevator 12 are fixed on the upper surface of the base 1. The first end of the second elevator 12 is connected to the end of the conveyor 11. The end of the second elevator 12 is connected to the rear air classifier 14 through a third connecting pipe 13. A discharge pipe 15 is fixed at the bottom of the rear air classifier 14.

[0024] In this embodiment, as Figure 3 As shown, a first waste removal pipe 904 is fixed to the rear side of the screening box 901, and the first waste removal pipe 904 is located between the inner top of the screening box 901 and the first screen 903. The first screen 903 and the second screen 907 are inclined backward. When the material moves along the first screen 903, the first screen 903 can remove large impurities such as straw and stones. The large impurities are finally discharged through the first waste removal pipe 904.

[0025] In this embodiment, as Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, the auxiliary vibration mechanism 905 includes a slide rail 9051, which is symmetrically fixed on the two inner walls of the screening box 901. A first motor 9052 is fixed on one inner wall of the slide rail 9051, and the output end of the first motor 9052 is connected to a lead screw 9053. A slider 9054 is threadedly connected to the outer side of the lead screw 9053, and the slider 9054 is slidably connected inside the slide rail 9051. A baffle 9055 is fixed between the slider 9054 and the two inner walls of the slide rail 9051. A second motor 9056 is fixed inside one of the sliders 9054. Furthermore, the output end of the second motor 9056 is connected to the rotating rod 9057, which is rotatably connected between two sliders 9054. Two pressing rods 9058 are fixed between the two sliders 9054. The lead screw 9053 can rotate under the action of the first motor 9052. At this time, the sliders 9054 can slide to the left or right under the limiting action of the slide rail 9051 and the lead screw 9053. Meanwhile, the rotating rod 9057 can rotate under the action of the second motor 9056. The components on the rotating rod 9057 will automatically strike the first screen 903, which can achieve the vibration effect.

[0026] In this embodiment, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a first groove 9059 is evenly provided on the outer circumference of the rotating rod 9057, and a first compression spring 90510 is fixed in the first groove 9059. A movable rod 90511 is fixed to the outer end of the first compression spring 90510, and a striking rod 90513 is rotatably connected to the outer end of the movable rod 90511. The striking rod 90513 is connected to the movable rod 90511 through a first spiral spring 90512, and a slot 90514 is provided on the inner end of the striking rod 90513. When the rotating rod 9057 rotates, the pressing rod 9058 first presses the corresponding component to unlock the striking rod 90513. Then, the striking rod 90513 is squeezed and rotates, the first spiral spring 90512 twists, and as the striking rod 90513 passes over the squeezing rod 9058, the movable rod 90511 retracts into the first groove 9059, the first compression spring 90510 is compressed, and after the striking rod 90513 passes over the squeezing rod 9058, the first spiral spring 90512 returns to its original position, the striking rod 90513 strikes the first screen 903, the first compression spring 90510 returns to its original position, and the movable rod 90511 and the striking rod 90513 automatically spring apart, which can achieve the effect of secondary striking and make the vibration effect better.

[0027] In this embodiment, as Figure 3 , Figure 6 and Figure 7As shown, the outer end of the movable rod 90511 is provided with a second groove 90515, and a second compression spring 90516 is fixed in the second groove 90515. The outer end of the second compression spring 90516 is fixed with a movable block 90517, and the movable block 90517 is slidably connected in the second groove 90515. The outer end face of the movable block 90517 is fixed with a locking block 90518, and the locking block 90518 is engaged in the locking groove 90514. When the movable block 90517 is pulled and moves, the locking block 90518 moves accordingly and leaves the locking groove 90514, and the striking rod 90513 is unlocked.

[0028] In this embodiment, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, rotating frames 90520 are symmetrically rotatably connected to the outer ends of the movable rod 90511. The rotating frames 90520 are connected to the movable rod 90511 through the second spiral spring 90521. The inner ends of the two rotating frames 90520 are connected to the movable block 90517 through the connecting rope 90519. A rubber sleeve 90522 is fixed between the movable rod 90511 and the striking rod 90513. The rubber sleeve 90522 wraps around the outside of the two rotating frames 90520 and can play a role in isolation and protection. When the rotating rod 9057 rotates, the rotating frame 90520 is first squeezed by the pressing rod 9058 and rotates. At this time, the movable block 90517 moves under the pulling action of the connecting rope 90519, and the locking block 90518 moves accordingly and unlocks the striking rod 90513.

[0029] In this embodiment, as Figure 3 As shown, a second waste removal pipe 909 is fixed on the rear side of the screening box 901, and the second waste removal pipe 909 is located between the second screen 907 and the second guide plate 908. When the material moves on the second screen 907, the second screen 907 can remove small impurities such as fine sand and fragments. The small impurities move along the second guide plate 908 and are eventually discharged through the second waste removal pipe 909.

[0030] In this embodiment, as Figure 3 , Figure 9 and Figure 10As shown, the material screening mechanism 910 includes a support frame 9101, which is fixed inside the screening box 901. A third screen 9102, a fourth screen 9103, and a fifth screen 9104 are fixed inside the support frame 9101. A first baffle 911 is fixed between the head of the fourth screen 9103 and the inner bottom of the screening box 901, and a baffle 911 is fixed between the tail of the fourth screen 9103 and the inner bottom of the screening box 901. A third baffle 913 is fixed between the tail of the second baffle 912 and the fifth screen 9104 and the inner bottom of the screening box 901. The third baffle 913 is fixed on an inner wall of the screening box 901. When the millet moves along the third screen 9102, the fourth screen 9103 and the fifth screen 9104, the third screen 9102, the fourth screen 9103 and the fifth screen 9104 can classify the millet according to its grain size (large grain / medium grain / small grain).

[0031] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 11 As shown, the bottom of the screening box 901 has three discharge ports 914, and the bottom of the screening box 901 is fixed with three discharge channels 915. The discharge channels 915 are connected to the discharge ports 914 one by one. Three discharge valves 916 are fixed at equal intervals on one side of the screening box 901, and the discharge valves 916 are connected to the discharge channels 915 one by one. The third screen 9102, the fourth screen 9103 and the fifth screen 9104 can classify the millet according to its particle size. Millet of different particle sizes is discharged through different discharge ports 914 and falls into different discharge channels 915. Opening the discharge valve 916 can pass the millet in the corresponding discharge channel 915 to the conveyor 11.

[0032] According to another aspect of the present invention, a method of using a grain separator with a dual air separation and dual dust removal closed-loop system is provided, comprising the following steps: S1. The material is fed into the feed hopper 3. The first elevator 2 transports the material to the pre-air classifier chamber 4. The pre-air classifier chamber 4 is responsible for the first air classification and dust removal. The first-stage cyclone dust collector 6 collects the dust, chaff and other light impurities from the pre-air classification. S2. After the material enters the screening box 901, the screening box 901 vibrates. The first screen 903 removes large impurities such as straw and stones. The large impurities are finally discharged through the first discharge pipe 904. The second screen 907 removes small impurities such as fine sand and fragments. The small impurities move along the second guide plate 908 and are finally discharged through the second discharge pipe 909. S3. When the material moves along the first screen 903, the two sliders 9054 and the rotating rod 9057 move to the left or right. The rotating frame 90520 is first squeezed by the squeezing rod 9058 and rotates, thereby unlocking the striking rod 90513. The striking rod 90513 is then squeezed and rotates. After the striking rod 90513 passes the squeezing rod 9058, it automatically rotates back and springs open together with the movable rod 90511, which facilitates automatic striking of the first screen 903, thereby achieving the vibration effect and facilitating more efficient separation of large impurities. S4, the third screen 9102, the fourth screen 9103 and the fifth screen 9104 grade the millet according to its particle size. Millet of different particle sizes is discharged through different discharge ports 914 and falls into the corresponding discharge channels 915. Each discharge channel 915 is matched with a discharge valve 916. Opening the discharge valve 916 can pass the millet of the corresponding particle size to the conveyor 11. The conveyor 11 and the second elevator 12 transport the millet to the post-air separation chamber 14 for a second air separation and dust removal. After the second dust removal, the millet is finally discharged through the discharge pipe 15 and enters the next process (such as drying and packaging).

[0033] The working principle of this device is as follows: First, the material is fed into the feed hopper 3. The first elevator 2 then feeds the material into the pre-flush air classifier 4 for the first air classification and dust removal. The first-stage cyclone dust collector 6 collects the dust, chaff, and other light impurities from the pre-flush air classification. After dust removal, the material enters the screening box 901 through the second connecting pipe 7 and the feed pipe 8. The vibrating motor 917 is then started, vibrating on its own. Since the vibrating motor 917 is fixed to the screening box 901, and the bottom frame 902 is connected to the support base 10 via a buffer spring, the vibrating motor 917 vibrates together with the screening box 901. The first screen 903 removes large impurities such as straw and stones. These large impurities are finally discharged through the first discharge pipe 904. The two lead screws 90... 53. The two sliders 9054 and the rotating rod 9057 move to the right. Simultaneously, the rotating rod 9057 rotates, and the rotating frame 90520 rotates under the pressure of the pressing rod 9058. The movable block 90517 moves under the pulling action of the connecting rope 90519, and the locking block 90518 moves accordingly and leaves the locking slot 90514, thus unlocking the striking rod 90513. Then, the striking rod 90513 rotates under pressure, and the first spiral spring 90512 twists. As the striking rod 90513 passes the pressing rod 9058, the movable rod 90511 retracts into the first groove 9059, and the first compression spring 90510 compresses. After the striking rod 90513 passes the pressing rod 9058, the first spiral spring 90512... When the first compression spring 90510 returns to its original position, the striking rod 90513 rotates and strikes the first screen 903. Simultaneously, the striking rod 90513, along with the movable rod 90511, springs open and strikes the first screen 903, facilitating a secondary vibration effect. This allows the first screen 903 to more efficiently separate large impurities such as straw and pebbles. The two sliders 9054 and the rotating rod 9057 move to the right until they reach their destination and then return to their original position. Simultaneously, the rotating rod 9057 reverses direction, performing a reciprocating motion to facilitate continuous striking of the first screen 903. The material, after the removal of large impurities, falls onto the second screen 907 under the guidance of the first guide plate 906 and moves along the second screen 907, where it removes small impurities such as fine sand and particles. Small impurities move along the second guide plate 908 and are eventually discharged through the second impurity discharge pipe 909. Then, the third screen 9102, the fourth screen 9103 and the fifth screen 9104 classify the millet according to its particle size (large / medium / small). Millet of different sizes is discharged through different discharge ports 914 and falls into the corresponding discharge channels 915. Opening the discharge valve 916 can pass the millet in the corresponding discharge channel 915 to the conveyor 11. The conveyor 11 transports the millet to the second elevator 12. The second elevator 12 transports the millet to the post-air classifier chamber 14. The post-air classifier chamber 14 is responsible for the second air classification and dust removal, further removing residual light impurities and fine dust. The millet after the second dust removal is discharged through the discharge pipe 15.

[0034] In summary, the grain sorting machine and its usage method with a closed-loop system of dual air separation and dual dust removal achieve the goals of dual air separation and dual dust removal, removal of impurities of all sizes, automatic classification, and efficient impurity removal, thus meeting people's usage needs.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grain separator with a dual-air separation and dual-dust removal closed-loop system, comprising a base (1), characterized in that: A first elevator (2) is fixed to the upper surface of the base (1). A feed hopper (3) is fixed to the head end of the first elevator (2). A pre-equipment air separation chamber (4) is fixed to the end of the first elevator (2). The top of the pre-equipment air separation chamber (4) is connected to a primary cyclone dust collector (6) through a first connecting pipe (5). The bottom of the pre-equipment air separation chamber (4) is connected to a feed pipe (8) through a second connecting pipe (7). A screen is fixed to the bottom of the feed pipe (8). The screening and impurity removal mechanism (9) includes a screening box (901), a bottom frame (902) fixed to the bottom of the screening box (901), a first screen (903), an auxiliary vibration mechanism (905), a first guide plate (906), a second screen (907), a second guide plate (908) and a material screening mechanism (910) fixed to the inner side of the screening box (901), and a vibration motor (917) fixed to the front side of the screening box (901). The upper surface of the base (1) is fixed with three support seats (10) at equal intervals. The bottom frame (902) is connected to the support seats (10) through a buffer spring. The upper surface of the base (1) is fixed with a conveyor (11) and a second elevator (12). The head of the second elevator (12) is connected to the end of the conveyor (11). The end of the second elevator (12) is connected to the rear air separation chamber (14) through a third connecting pipe (13). The bottom of the rear air separation chamber (14) is fixed with a discharge pipe (15).

2. A grain separator with a dual-air separation and dual-dust removal closed-loop system according to claim 1, characterized in that: The screening box (901) is fixed with a first waste discharge pipe (904) on the rear side, and the first waste discharge pipe (904) is located between the inner top of the screening box (901) and the first screen (903).

3. A grain sorting machine with a dual-air separation and dual-dust removal closed-loop system according to claim 2, characterized in that: The auxiliary vibration mechanism (905) includes a slide rail (9051), which is symmetrically fixed on the two inner walls of the screening box (901). A first motor (9052) is fixed on one inner wall of the slide rail (9051), and the output end of the first motor (9052) is connected to a lead screw (9053). A slider (9054) is threadedly connected to the outer side of the lead screw (9053), and the slider (9054) is slidably connected to the slide rail (9051). 51) Inside, a baffle (9055) is fixed between the two inner walls of the slider (9054) and the slide rail (9051). A second motor (9056) is fixed inside one of the sliders (9054), and the output end of the second motor (9056) is connected to the rotating rod (9057). The rotating rod (9057) is rotatably connected between the two sliders (9054), and two extrusion rods (9058) are fixed between the two sliders (9054).

4. A grain cleaning machine with a dual-air separation and dual-dust removal closed-loop system according to claim 3, characterized in that: The outer circumference of the rotating rod (9057) is uniformly provided with a first groove (9059), and a first compression spring (90510) is fixed in the first groove (9059). The outer end of the first compression spring (90510) is fixed with a movable rod (90511), and the outer end of the movable rod (90511) is rotatably connected with a striking rod (90513). The striking rod (90513) is connected to the movable rod (90511) through a first spiral spring (90512), and the inner end of the striking rod (90513) is provided with a slot (90514).

5. A grain sorting machine with a dual air separation and dual dust removal closed-loop system according to claim 4, characterized in that: The movable rod (90511) has a second groove (90515) at its outer end, and a second compression spring (90516) is fixed in the second groove (90515). A movable block (90517) is fixed at the outer end of the second compression spring (90516), and the movable block (90517) is slidably connected in the second groove (90515). A locking block (90518) is fixed on the outer end face of the movable block (90517), and the locking block (90518) is engaged in the slot (90514).

6. A grain sorting machine with a dual air separation and dual dust removal closed-loop system according to claim 5, characterized in that: The movable rod (90511) is symmetrically rotatably connected to two rotating frames (90520) on both sides of its outer end. The rotating frames (90520) are connected to the movable rod (90511) through a second spiral spring (90521). The inner ends of the two rotating frames (90520) are connected to the movable block (90517) through a connecting rope (90519). A rubber sleeve (90522) is fixed between the movable rod (90511) and the striking rod (90513), and the rubber sleeve (90522) wraps around the outside of the two rotating frames (90520).

7. A grain separator with a dual-air separation and dual-dust removal closed-loop system according to claim 6, characterized in that: The rear side of the screening box (901) is fixed with a second waste discharge pipe (909), and the second waste discharge pipe (909) is located between the second screen (907) and the second guide plate (908).

8. A grain separator with a dual-air separation and dual-dust removal closed-loop system according to claim 7, characterized in that: The material screening mechanism (910) includes a support frame (9101), which is fixed inside the screening box (901). A third screen (9102), a fourth screen (9103), and a fifth screen (9104) are fixed inside the support frame (9101). A first baffle (911) is fixed between the head of the fourth screen (9103) and the bottom of the screening box (901). A second baffle (912) is fixed between the tail of the fourth screen (9103) and the bottom of the screening box (901). A third baffle (913) is fixed between the tail of the fifth screen (9104) and the bottom of the screening box (901). The third baffle (913) is fixed on an inner wall of the screening box (901).

9. A grain sorting machine with a dual air separation and dual dust removal closed-loop system according to claim 8, characterized in that: The bottom of the screening box (901) is provided with three discharge ports (914) and three discharge channels (915) are fixed at the bottom of the screening box (901). The discharge channels (915) are connected to the discharge ports (914) one by one. Three discharge valves (916) are fixed at equal intervals on one side of the screening box (901) and the discharge valves (916) are connected to the discharge channels (915) one by one.

10. A method of using a grain separator with a dual-air-separation, dual-dust-removal closed-loop system, applicable to the grain separator with a dual-air-separation, dual-dust-removal closed-loop system as described in claim 9, characterized in that... Includes the following steps: S1. Pass the material into the feed hopper (3), and the first elevator (2) transports the material to the pre-air classifier (4). The pre-air classifier (4) is responsible for the first air classification dust removal, and the first-stage cyclone dust collector (6) collects the dust, chaff and other light impurities from the pre-air classification. S2. After the material enters the screening box (901), the screening box (901) vibrates. The first screen (903) removes large impurities such as straw and stones. The large impurities are finally discharged through the first discharge pipe (904). The second screen (907) removes small impurities such as fine sand and broken particles. The small impurities move along the second guide plate (908) and are finally discharged through the second discharge pipe (909). S3. When the material moves along the first screen (903), the two sliders (9054) and the rotating rod (9057) move to the left or right. The rotating frame (90520) is first squeezed by the extrusion rod (9058) and rotates, thereby unlocking the striking rod (90513). The striking rod (90513) is then squeezed and rotates. After the striking rod (90513) passes the extrusion rod (9058), it automatically rotates back and springs open together with the movable rod (90511), which facilitates automatic knocking on the first screen (903) to achieve the vibration effect and facilitate more efficient separation of large impurities. S4, the third screen (9102), the fourth screen (9103) and the fifth screen (9104) classify the millet according to its particle size. Millet of different particle sizes is discharged through different discharge ports (914) and falls into the corresponding discharge channel (915). Each discharge channel (915) is matched with a discharge valve (916). Opening the discharge valve (916) can pass the millet of the corresponding particle size to the conveyor (11). The conveyor (11) and the second elevator (12) transport the millet to the post-air separation chamber (14) for a second air separation and dust removal. The millet after the second dust removal is finally discharged through the discharge pipe (15) and enters the next process.

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