A gravity separator

Abstract

The application provides a gravity sorting machine, relates to the technical field of sorting machines, and solves the technical problem that immature rice grains and broken rice cannot be removed after the screen hole is blocked in the rice sorting process in the prior art. The gravity sorting machine comprises a rack, a feeding device, a conveying device and a collecting device which are sequentially and fixedly arranged along the length direction of the rack. The feeding device is arranged above one end of the rack along the length direction of the rack. The conveying device is arranged on the rack along the length direction of the rack and is used for conveying the rice to be screened from the feeding device to the collecting device. The collecting device is installed on the side of the rack away from the feeding device along the length direction of the rack and is arranged on the width side wall of the rack. The rice grains are thrown at the collecting device through the transportation of the conveying belt, so that the screening of the complete rice grains, the broken rice and the straw is realized.

Description

Technical Field

[0001] This invention relates to the field of sorting machine technology, and in particular to a gravity sorting machine. Background Technology

[0002] A gravity separator is a device that separates materials based on differences in density. It consists of a hopper, a discharge port, a separation chamber, a support frame, and a drive mechanism. After entering the separation chamber through the hopper, the material is thrown downwards by gravity, forming a parabola of a certain height. The thrown material passes through an eccentric ring within the separation chamber and then falls to the ground. A mechanical device straightens the parabolic trajectory, causing the material to fall from the support frame and finally into the hopper, completing one material separation cycle.

[0003] Currently, in the rice screening process, it is necessary to remove straw, immature grains, and broken rice. The most common methods for removal are using vibrating screens and air separation, with the sorting efficiency adjusted by changing the aperture of the vibrating screen.

[0004] However, screen clogging often occurs during the sorting process. When the screen clogging occurs, immature rice grains and broken rice cannot be removed, and the finished rice overflows into the impurity outlet, resulting in waste of finished product and the inability to completely remove immature rice grains and broken rice. Summary of the Invention

[0005] The purpose of this invention is to provide a gravity sorting machine to solve the technical problem in the prior art where screen clogging frequently occurs during the rice sorting process, making it impossible to remove immature rice grains and broken rice after screen clogging. 。 The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a gravity sorting machine, comprising a frame, a feeding device, a conveying device, and a collecting device sequentially fixed along the length of the frame. The feeding device includes a feed hopper mounted on the frame. The conveying device includes a conveyor belt that conveys along the length of the frame and a drive assembly for driving the conveyor belt. The collecting device includes a receiving box with an inlet and an outlet. One end of the conveyor belt is located below the feed hopper, and the other end of the conveyor belt is conveyed to the receiving box through the inlet. A baffle plate is provided on the inner wall of the receiving box, dividing the receiving box into at least two chambers. The chambers are arranged along the conveying direction of the conveyor belt, and each chamber is interconnected from the top. The communication direction of each chamber is perpendicular to the conveying direction of the conveyor belt. A discharge assembly is provided on the bottom surface of the receiving box, and one discharge assembly is provided for each chamber. The discharge assembly is installed at the outlet.

[0008] Optionally, the lower end of the baffle plate is hinged to the receiving box, and the side wall of the receiving box is provided with an arc-shaped groove centered on the hinge axis of the baffle plate. The upper end of the baffle plate is fixedly connected to an adjusting shaft that is slidably disposed in the arc-shaped groove. The adjusting shaft penetrates the arc-shaped groove, and a positioning nut for tightening the side wall of the receiving box is screwed onto the adjusting shaft.

[0009] Optionally, a guide plate is fixedly connected to the end of the baffle away from the hinge point, and the end of the guide plate away from the baffle is inclined from the vertical direction toward the direction of the conveyor belt.

[0010] Optionally, the conveying device further includes a cover plate and multiple guide plates. The cover plate is fixedly connected to the frame and covers the top of the conveyor belt. Multiple air inlet pipes are fixedly connected to the top of the cover plate. The multiple guide plates are fixedly installed on the inner wall of the cover plate. The guide plates are located below the air inlet pipes. The multiple guide plates are arranged along the conveyor belt transport direction. An air inlet channel facing the surface of the conveyor belt is provided between two adjacent guide plates.

[0011] Optionally, the collecting device further includes an exhaust pipe, which is fixedly connected to the side wall of the receiving box near the conveyor belt, and the exhaust pipe is connected to the chamber closest to the conveyor belt.

[0012] Optionally, the conveyor belt is provided with slots for receiving rice grains.

[0013] Optionally, the feeding device includes a feed box, one end of which is mounted on a cover plate and the other end of which is connected to a feed hopper. The feed box is inclined and has a feed passage cavity inside that extends from the feed hopper to the conveyor belt.

[0014] Optionally, the feeding device further includes a first electromagnetic vibration device and a material flow plate. The first electromagnetic vibration device is disposed below the feed hopper, and the material flow plate is mounted on the first electromagnetic vibration device. The material flow plate has a guide cavity. The material flow plate is disposed below the feed hopper, and the guide cavity is connected to the feed hopper and the material guiding cavity respectively.

[0015] Optionally, the feeding device further includes a mounting frame and an adjustment component for adjusting the movement of the mounting frame in the height direction of the frame. The feed hopper, the first electromagnetic vibration device, and the material flow plate are all fixedly mounted on the mounting frame. One end of the feed box is hinged to the mounting frame, and the other end of the feed box is slidably disposed on the cover plate. The sliding direction of the feed box on the cover plate is perpendicular to the moving direction of the mounting frame.

[0016] Optionally, the discharge assembly includes a discharge plate and a second electromagnetic vibration device. The second electromagnetic vibration device is mounted on the frame, and the discharge plate is fixedly mounted on the second electromagnetic vibration device. The discharge plate is located below the discharge port, and the discharge plate has a discharge cavity that is connected to the discharge port. The discharge plate is inclined, and the lower end of the discharge plate has a discharge port that is connected to the discharge cavity.

[0017] The preferred technical solution of the present invention can also produce at least the following technical effects:

[0018] Through the coordinated operation of the feeding, conveying, and collecting devices, the rice to be screened is placed in the feed hopper during operation. The rice then falls from the hopper's outlet onto the conveyor belt and moves with it. When the conveyor belt carries the rice to the inlet of the receiving hopper, the rice on the belt is thrown out by inertia and falls into the receiving hopper. Because the straw and husks in the rice are lighter, they fall into the chambers closer to the conveyor belt, while the heavier rice falls into the chambers farther away.

[0019] When it is necessary to screen out immature rice grains and broken rice from the grains, baffles are added to increase the number of chambers. As a result, immature rice grains and broken rice, being lighter than mature rice grains and lighter than straw and rice husks, fall into the middle chamber during the screening process. This solves the problem that in the existing technology, screen holes often become clogged during the rice sorting process, and immature rice grains and broken rice cannot be removed when the screen holes are clogged. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the feeding device structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the axial side view structure provided in Embodiment 3 of the present invention;

[0024] Figure 4 yes Figure 3 Enlarged view of point Q in the image;

[0025] Figure 5 This is a side sectional view of the structure provided in an embodiment of the present invention;

[0026] Figure 6 yes Figure 5 Enlarged view of point E in the image;

[0027] Figure 7 This is a cross-sectional structural diagram provided in an embodiment of the present invention;

[0028] Figure 8 yes Figure 3 Enlarged view of point W in the image.

[0029] Explanation of reference numerals in the attached drawings: 100, frame; 200, feeding device; 210, hopper; 220, material flow plate; 221, guide cavity; 231, bracket; 232, mounting bracket; 233, transmission rod shaft; 234, worm gear; 235, handle; 236, drive shaft; 240, first electromagnetic vibration device; 250, feed box; 251, sliding shaft; 252, feed passage cavity; 300, conveying device; 310, stepper motor; 320, gearbox; 330, drive shaft; 340. Cover plate; 341, chute; 350, conveyor belt; 351, pit; 360, air inlet pipe; 370, guide plate; 380, driven shaft; 400, collecting device; 410, receiving box; 420, exhaust pipe; 430, discharge assembly; 431, discharge plate; 432, second electromagnetic vibration device; 433, discharge chamber; 434, discharge port; 440, baffle plate; 450, guide plate; 460, support protrusion; 470, adjusting shaft; 480, positioning nut; 490, arc groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] The following is in conjunction with the appendix Figure 1-4 To further illustrate this application, an embodiment of this application discloses a gravity sorting machine.

[0034] Reference Figure 1 As shown, a gravity separator includes a frame 100, a feeding device 200, a conveying device 300, and a collecting device 400. The feeding device 200, conveying device 300, and collecting device 400 are arranged sequentially along the length of the frame 100. The feeding device 200 is positioned above one end of the frame 100 along its length. The conveying device 300 is mounted on the frame 100 along its length and is used to transport the rice to be screened from the feeding device 200 to the collecting device 400. The collecting device 400 is installed on the side of the frame 100 away from the feeding device 200 along its length and is located on the width sidewall of the frame 100.

[0035] Reference Figure 2 and Figure 3As shown, the feeding device 200 includes a bracket 231, a mounting frame 232, and a feed hopper 210. The bracket 231 is fixedly connected to the top surface of one end of the frame 100, and the bracket 231 is arranged in the form of two opposing frame plates. The mounting frame 232 is disposed between the two frame plates, that is, the mounting frame 232 is slidably disposed along the height direction of the bracket 231. The feed hopper 210 is fixedly connected to the mounting frame 232. The bracket 231 is also provided with an adjustment component for driving the mounting frame 232 to move along the height direction.

[0036] The adjustment assembly includes two drive shafts 233 rotatably mounted on the frame plate. The two ends of the drive shafts 233 pass through the top surface of the bracket 231 and the bottom surface of the frame 100, respectively, and the axial direction of the drive shafts is parallel to the height direction of the bracket 231. Both ends of the mounting bracket 232 are passed through by the two drive shafts 233, and the drive shafts 233 are threadedly connected to the mounting bracket 232, while the mounting bracket 232 is slidably connected to the bracket 231. Thus, when the drive shafts 233 rotate, the mounting bracket 232 engages with the drive shafts 233, and the mounting bracket 232, constrained by the bracket 231, slides along the height direction of the bracket 231 when the drive shafts 233 rotate.

[0037] Reference Figure 3 and Figure 4 As shown, the adjustment assembly also includes a drive shaft 236 and a handle 235. The drive shaft 236 is rotatably mounted on the bottom surface of the frame 100 and is a threaded shaft. The handle 235 is coaxially fixedly connected to the end of the drive shaft 236, thereby rotating the drive shaft 236 by rotating the handle 235. Worm gears 234 for threaded connection with the drive shaft 236 are fixedly connected to the ends of the two drive shafts respectively.

[0038] Therefore, during use, rotating the handle 235 drives the drive shaft 236 to rotate. During the rotation of the drive shaft 236, it meshes with the worm gear 234 to drive the two transmission rod shafts 233 to rotate. As a result, the transmission rod shafts 233 drive the frame plate to move along the vertical direction of the support 231, thereby realizing the adjustment of the feed hopper 210 in the height direction.

[0039] Reference Figure 2 and Figure 3As shown, the feeding device 200 also includes multiple first electromagnetic vibration devices 240 and multiple material flow plates 220. The lower end of the feed hopper 210 is provided with multiple feeding ports for feeding material to the conveying device 300. Each of the multiple first electromagnetic vibration devices 240 is correspondingly arranged with one of the multiple feeding ports. The first electromagnetic vibration devices 240 are fixedly connected to the mounting frame 232 and are located below the feed hopper 210. Each material flow plate 220 is correspondingly arranged with each first electromagnetic vibration device 240, that is, the material flow plate 220 is fixedly connected to the first electromagnetic vibration device 240 and is located directly below the feeding port.

[0040] The material flow plate 220 has a guide cavity 221, the top surface of which is through and aligned with the feed inlet of the feed hopper 210, meaning the guide cavity 221 is connected to the feed inlet. When the rice grains in the feed hopper 210 fall from the feed inlet, they fall vertically into the guide cavity 221. The guide cavity 221 has an outward discharge opening on the side facing the conveying device 300. Thus, when the rice grains fall onto the material flow plate 220, the first electromagnetic vibration device 240 is activated, providing vibration to the material flow plate 220 to ensure that the rice grains flow from the material flow plate 220 to the conveying device 300. Furthermore, the vibration process separates the tightly compressed rice grains, facilitating subsequent transportation and ensuring that the rice grains are in a separate separation device during the screening process, effectively improving the screening effect.

[0041] Reference Figure 5 and Figure 6 As shown, the feeding device 200 also includes a feed box 250. One end of the feed box 250 is hinged to the mounting frame 232, and the hinge axis of the feed box 250 is parallel to the axis of the drive shaft 236. The other end of the feed box 250 is slidably mounted on the conveying device 300, and is slidably mounted on the conveying device 300 along the length of the frame 100. The feed box 250 has a feed passage cavity 252 inside, and one end of the material flow plate 220 with a guide cavity 221 is inserted into the feed passage cavity 252.

[0042] The feed box 250 is inclined, wherein one end of the feed box 250 is hinged to the mounting frame 232 and is slidably connected to one end of the conveying device 300.

[0043] The conveying device 300 includes a conveyor belt 350 and a cover plate 340. The conveyor belt 350 is mounted on a frame 100, and the frame 100 is also equipped with a drive assembly for driving the conveyor belt 350. The conveyor belt 350 transports materials from the feeding device 200 to the collecting device 400 along the length of the frame 100. The cover plate 340 is fixedly connected to the frame 100 and covers the conveyor belt 350. Therefore, the cover plate 340 effectively protects the conveyor belt 350 during use. Furthermore, the cover plate 340 ensures that the rice is not affected by external wind forces during the conveyor belt 350's transport of rice.

[0044] Reference Figure 4 and Figure 6 As shown, the feeding device 200 also includes a sliding shaft 251, which is fixedly connected to the end of the feed box 250 away from the hinge point, and the axial direction of the sliding shaft 251 is parallel to the hinge axis direction. A groove 341 is provided on the side wall of the cover plate 340, and the sliding shaft 251 is slidably disposed in the groove 341.

[0045] During use, the rice in the feed hopper 210 flows into the guide cavity 221 of the material flow plate 220. During this process, the first electromagnetic vibration device 240 is activated, causing the rice in the material flow plate 220 to vibrate, so that the rice flows from the opening of the guide cavity 221 into the feeding passage cavity 252 of the feeding box 250, and flows along the inclined feeding passage cavity 252 onto the conveyor belt 350.

[0046] By conveying the rice that needs to be screened to the conveyor belt 350 through the inclined feeding cavity 252, a certain initial velocity is provided to the rice, thereby ensuring that the rice can move synchronously under the action of friction between the conveyor belt 350 and the rice when it falls onto the conveyor belt 350, reducing the possibility that the rice will move in the opposite direction along the conveyor belt 350.

[0047] Furthermore, when different types of rice are being screened, due to the different qualities of the rice, the tilt angle of the feed box 250 needs to be adjusted when the rice flows from the material flow plate 220 to the conveyor belt 350 to ensure that the speed of the different types of rice flowing onto the conveyor belt 350 is similar to the transport speed of the conveyor belt 350.

[0048] During adjustment, rotating handle 235 drives drive shaft 236 to rotate. Drive shaft 236, in turn, meshes with worm gear 234 to drive two transmission shafts 233 to rotate. These transmission shafts 233 then move the frame plate along the vertical direction of support 231. As the frame plate moves vertically along the height of support 231, the end of feed box 250 connected to support 231 rotates around its hinge axis. The other end of feed box 250, sliding shaft 251, moves horizontally along the length of chute 341, i.e., the length of conveyor belt 350. During this process, feed box 250 also rotates angularly around sliding shaft 251.

[0049] This allows for changes in the tilt angle of the feed box 250, thereby enabling adjustments during the screening process for different varieties of rice, ensuring that the initial speed during screening is the same as or similar to that of the conveyor belt 350.

[0050] Reference Figure 3 and Figure 5 As shown, the drive assembly includes a drive shaft 330, a driven shaft 380, and a stepper motor 310. The drive shaft 330 and the driven shaft 380 are rotatably mounted on the frame 100, and the axis directions of the drive shaft 330 and the driven shaft 380 are parallel to the axis direction of the drive shaft 236. The drive shaft 330 is located near the feed hopper 210, and the driven shaft 380 is located near the collecting device 400. The stepper motor 310 is fixedly mounted on the frame 100. A gearbox 320 for connecting the output shaft of the stepper motor 100 is also fixedly mounted on the frame 100. The gearbox 320 is connected to the drive shaft 330 via a belt, thereby enabling the stepper motor 310 to drive the drive shaft 330 to rotate.

[0051] The conveyor belt 350 is mounted on the drive shaft 330 and the driven shaft 380, and rotates as the drive shaft 330 rotates. The rotational speed of the drive shaft 330 can be changed by the transmission 320, thereby altering the horizontal linear speed of the conveyor belt 350. This improves the applicability of the conveyor belt 350, allowing the conveying speed to be adjusted according to different varieties of rice.

[0052] Reference Figure 4 and Figure 6 As shown, the surface of the conveyor belt 350 is provided with grooves 351 for accommodating rice grains. The shape of the grooves 351 includes, but is not limited to, rectangular annular grooves, V-shaped annular grooves, or multiple hexagonal grooves, bowl-shaped grooves, etc., which are provided along the extension direction of the surface of the conveyor belt 350.

[0053] By designing the grooves, when the rice falls onto the conveyor belt 350, it rolls into the trough 351, thus achieving the first step of separation between the rice and straw. The rice in the trough 351 moves synchronously with the conveyor belt 350, reducing the occurrence of rolling. When the conveyor belt 350 transports the rice to the collection device 400, the rotation of the conveyor belt 350 by the driven shaft 380 makes it easier for the rice to be ejected.

[0054] Reference Figure 4 and Figure 6 As shown, the conveying device 300 also includes multiple guide plates 370 and air inlet pipes 360. The multiple air inlet pipes 360 are fixedly connected to the top surface of the cover plate 340 and communicate with the cavity covered by the cover plate 340 and the conveyor belt 350. The communication direction of the air inlet pipes 360 is perpendicular to the surface of the conveyor belt 350. In use, the air inlet pipes 360 are connected to an external air source to deliver air into the cavity formed by the cover plate 340 and the conveyor belt 350.

[0055] The diversion plate 370 is disposed below the cover plate 340 and below the connection point between the air inlet pipe 360 ​​and the cover plate 340. The diversion plate 370 is fixedly connected to the side wall of the cover plate 340 along its length. Multiple diversion plates 370 are arranged sequentially along the length of the cover plate 340. An air inlet channel facing the surface of the conveyor belt 350 is provided between two adjacent diversion plates 370. The diversion plate 370 near the feed box 250 is lower than the feed plate 450 near the collection device 400. When the air inlet pipe 360 ​​is ventilated, the airflow flows from the diversion plates 370 through the gaps between the diversion plates 370 to the surface of the conveyor belt 350, and the flow direction is from one end of the diversion box towards the collection device 400.

[0056] This helps to accelerate some of the splashed materials along the movement direction of the conveyor belt 350, while supplementing the airflow and increasing the gas flow rate inside the receiving box 410, indirectly helping to separate material impurities.

[0057] Reference Figure 5 and Figure 7 As shown, the collecting device 400 includes a receiving box 410 and a discharging assembly 430. The receiving box 410 is located at one end of the frame 100 along its length, i.e., the receiving box 410 is fixedly connected to the side wall of the frame 100 along its width. The receiving box 410 has an inlet and an outlet. The inlet is located on the side wall of the receiving box 410 and faces the conveyor belt 350. That is, the driven shaft 380 is rotatably mounted at the inlet, so that when the conveyor belt 350 carries the rice to the inlet, the rice is thrown into the inner cavity of the receiving box 410 by the rotation of the driven shaft 380.

[0058] The discharge port of the receiving box 410 is located on the bottom surface of the receiving box 410, and is used to discharge the rice inside the receiving box 410. The discharge assembly 430 is fixedly installed on the frame 100, and is located below the feed inlet. The discharge assembly 430 is used to receive rice grains, residual rice, straw and other impurities after screening.

[0059] The collecting device 400 also includes multiple baffles 440, which are disposed in the receiving box 410. In this embodiment, two baffles 440 are provided. Three discharge ports are provided, with a supporting protrusion 460 between adjacent discharge ports. One end of each baffle 440 is hinged to the protrusion, and the other end of the baffle 440 is adjustablely slidably disposed on the side wall of the receiving box 410. The height of the baffle 440 is lower than the bottom surface of the inlet, and the baffle 440 and the side wall of the receiving box 410 form a chamber for collecting the screened rice.

[0060] In this embodiment, three chambers are provided, which are interconnected above the receiving box 410. Along the length of the frame 100, from one end of the conveyor belt 350 away from it, they are used to collect straw and other impurities, broken rice, and finished rice, respectively.

[0061] When the conveyor belt 350 ejects rice grains carrying paddy from the feed inlet into the receiving box 410, the mature and intact rice grains have the largest mass, thus traveling the farthest and landing in the chamber furthest from the driven shaft 380. Broken rice grains have a mass greater than straw but less than mature and intact rice grains, thus landing in the middle chamber. Straw, weeds, and other materials have the smallest mass, thus landing in the chamber closest to the driven shaft 380.

[0062] Reference Figure 5 and Figure 7 As shown, a guide plate 450 is fixedly connected to one end of the baffle plate 440 away from the hinge point. The guide plate 450 extends along the width direction of the baffle plate 440, and the end of the guide plate 450 away from the baffle plate 440 is inclined toward the conveyor belt 350.

[0063] By utilizing the inclined setting of the feed plate 450, when mature and whole rice grains or rice residue fall in an arc-shaped trajectory and land directly above the feed plate 450, the upper surface of the feed plate 450 will provide guidance for the rice residue or whole rice grains, making it easier for them to fall into the corresponding chamber.

[0064] Reference Figure 7 and Figure 8As shown, adjusting shafts 470 are fixedly connected to the two side walls of the receiving box 410 facing the baffle plate 440. The axial direction of the adjusting shafts 470 is parallel to the axial direction of the hinge of the baffle plate 440. An arc-shaped groove 490 with the hinge point of the baffle plate 440 as the center is opened on the side wall of the receiving box 410, and the arc-shaped groove 490 is set through the receiving box 410. The adjusting shaft 470 is slidably disposed in the arc-shaped groove 490, and the end of the adjusting shaft 470 away from the connection point is set through the receiving box 410. A positioning nut 480 is threadedly connected to the adjusting shaft 470, and the positioning nut 480 is tightened on the outer side wall of the receiving box 410.

[0065] When it is necessary to adjust the size of the opening at the top of the chamber, loosen the positioning nut 480, and then push the adjusting shaft 470 to slide along the arc groove 490, thereby driving the baffle plate 440 to rotate at the hinge point. After the adjustment is completed, rotate the positioning nut 480 to tighten it against the outer wall of the receiving box 410, thereby fixing the adjusting shaft 470.

[0066] By adjusting the baffle plate 440, the opening of the chamber can be changed, thereby adjusting the screening rate of mature and whole rice grains. Furthermore, it can effectively adjust the screening process when screening different types of rice grains.

[0067] Reference Figure 7 As shown, the collecting device 400 also includes an exhaust pipe 420, which is fixedly connected to the side wall of the receiving box 410 and connected to the chamber closest to the driven shaft 380. During operation, the exhaust pipe 420 draws air from inside the receiving box 410, and the chamber closest to the driven shaft 380 collects straw and other impurities. Therefore, when the exhaust pipe 420 is activated, it absorbs the straw conveyed by the conveyor belt 350, thereby effectively absorbing straw and other impurities and improving the screening effect between straw and rice grains.

[0068] Reference Figure 3 and Figure 5 As shown, multiple discharge assemblies 430 are provided, each corresponding to a different discharge port. Each discharge assembly 430 includes a discharge plate 431 and a second electromagnetic vibration device 432. The second electromagnetic vibration device 432 is fixedly connected to the frame 100, and the discharge plate 431 is mounted above the second electromagnetic vibration device 432. The discharge plate 431 has a discharge chamber 433 located directly below it, allowing whole rice grains, broken rice grains, or straw discharged from the discharge port to fall directly into the discharge chamber 433.

[0069] The discharge plate is inclined, and the lower end of the discharge plate has a discharge port 434 that connects to the discharge chamber 433. During use, the second electromagnetic vibration device 432 is activated, providing vibration to the discharge plate to facilitate material discharge. The inclined discharge plate further enhances the discharge effect. Whole rice grains, broken rice grains, or straw in the receiving box 410 are discharged through the discharge port 434 and fall onto the discharge plate, thus achieving material discharge. The discharge output can be increased by increasing the length of the discharge plate.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gravity sorting machine, characterized in that, The system includes a frame (100), a feeding device (200), a conveying device (300), and a collecting device (400) sequentially fixed along the length of the frame (100). The feeding device (200) includes a feed hopper (210) mounted on the frame (100). The conveying device (300) includes a conveyor belt (350) that conveys along the length of the frame (100) and a drive assembly that drives the conveyor belt (350). The collecting device (400) includes a receiving box (410) with an inlet and an outlet. One end of the conveyor belt (350) is located at the feed hopper (210). Below the material receiving box (410), the other end of the conveyor belt (350) is conveyed to the receiving box (410) through the inlet. The receiving box (410) is provided with a baffle plate (440) that divides the receiving box (410) into at least two chambers on the inner wall. The chambers are arranged in the direction of transport of the conveyor belt (350). Each chamber is connected to each other from the top. The direction of connection of each chamber is perpendicular to the direction of transport of the conveyor belt (350). The bottom surface of the receiving box (410) is provided with a discharge assembly (430). Each chamber is provided with a discharge assembly (430). The discharge assembly (430) is installed at the outlet. The conveying device (300) also includes a cover plate (340) and a plurality of diverting plates (370). The cover plate (340) is fixedly connected to the frame (100) and covers the top of the conveyor belt (350). A plurality of air inlet pipes (360) are fixedly connected to the cover plate (340). The plurality of diverting plates (370) are fixedly installed on the inner wall of the cover plate (340). The diverting plates (370) are located below the air inlet pipes (360). The plurality of diverting plates (370) are arranged along the transport direction of the conveyor belt (350). An air inlet channel facing the surface of the conveyor belt (350) is provided between two adjacent diverting plates (370). The collecting device (400) also includes an exhaust pipe (420), which is fixedly connected to the side wall of the receiving box (410) near the conveyor belt (350) and is connected to the chamber closest to the conveyor belt (350). The lower end of the baffle plate (440) is hinged to the receiving box (410). The side wall of the receiving box (410) is provided with an arc groove (490) centered on the hinge axis of the baffle plate (440). The upper end of the baffle plate (440) is fixedly connected to an adjusting shaft (470) that is slidably disposed in the arc groove (490). The adjusting shaft (470) penetrates the arc groove (490). A positioning nut (480) for tightening the side wall of the receiving box (410) is screwed onto the adjusting shaft (470). The end of the baffle plate (440) away from the hinge point is fixedly connected to the feed plate (450), and the end of the feed plate (450) away from the baffle plate (440) is inclined in the direction of the vertical direction toward the conveyor belt (350).

2. The gravity sorting machine according to claim 1, characterized in that, The conveyor belt (350) has grooves (351) for holding rice grains.

3. A gravity sorting machine according to claim 1, characterized in that, The feeding device (200) includes a feed box (250), one end of which is mounted on a cover plate (340), and the other end of which is connected to a feed hopper (210). The feed box (250) is inclined, and the feed box (250) has a feed passage cavity (252) in the direction from the feed hopper (210) to the conveyor belt (350).

4. A gravity sorting machine according to claim 3, characterized in that, The feeding device (200) further includes a first electromagnetic vibration device (240) and a material flow plate (220). The first electromagnetic vibration device (240) is disposed below the feed hopper (210). The material flow plate (220) is mounted on the first electromagnetic vibration device (240). A guide cavity (221) is provided on the material flow plate (220). The material flow plate (220) is disposed below the feed hopper (210). The guide cavity (221) is connected to the feed hopper (210) and the material guiding passage cavity (252) respectively.

5. A gravity sorting machine according to claim 4, characterized in that, The feeding device (200) further includes a mounting frame (232) and an adjustment component for adjusting the movement of the mounting frame (232) in the height direction of the frame (100). The feed hopper (210), the first electromagnetic vibration device (240) and the material flow plate (220) are all fixedly installed on the mounting frame (232). One end of the feed box (250) is hinged to the mounting frame (232), and the other end of the feed box (250) is slidably disposed on the cover plate (340). The sliding direction of the feed box (250) on the cover plate (340) is perpendicular to the moving direction of the mounting frame (232).

6. A gravity sorting machine according to claim 1, characterized in that, The discharge assembly (430) includes a discharge plate (431) and a second electromagnetic vibration device (432). The second electromagnetic vibration device (432) is mounted on the frame (100). The discharge plate (431) is fixedly mounted on the second electromagnetic vibration device (432). The discharge plate (431) is located below the discharge port. The discharge plate (431) has a discharge cavity (433) connected to the discharge port. The discharge plate (431) is inclined. The lower end of the discharge plate (431) has a discharge port (434) connected to the discharge cavity (433).

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