specific gravity sieve

Abstract

The application provides a specific gravity sieve, which comprises a rack, a sieve body, a first shaft body, a second shaft body and two groups of eccentric blocks; the sieve body is transmissionally connected with a reciprocating driving member; the first shaft body and the second shaft body are arranged in parallel and are rotationally arranged on the rack; a motion transmission mechanism is arranged between the first shaft body and the sieve body or the reciprocating driving member; a transmission structure is arranged between the first shaft body and the second shaft body; the two groups of eccentric blocks are arranged on the first shaft body and the second shaft body respectively. When the reciprocating driving member drives the sieve body to move and generate an inertial force, the first shaft body and the second shaft body rotate at the same angular velocity and in the opposite directions to generate two groups of centrifugal forces; wherein the horizontal components of the two groups of centrifugal forces are superposed and offset the inertial force generated by the sieve body; at the same time, the vertical components of the two groups of centrifugal forces offset each other to avoid the generation of additional force. The specific gravity sieve provided by the application can eliminate vibration and realize high-stability grain processing operation.

Description

Technical Field

[0001] This application belongs to the field of agricultural machinery technology, specifically relating to a specific gravity screen. Background Technology

[0002] A gravity screen is an agricultural machine used in the processing of grains such as corn and wheat. It utilizes the difference in specific gravity of materials, through the high-speed reciprocating motion of the screen body on the frame, to achieve the efficient separation of light impurities, chaff, and plump grains, thus achieving the technical purpose of grain screening. During this process, the movement of the screen body generates inertial forces acting on the frame. For agricultural machinery, the horizontal component of this inertial force can cause frame vibration, abnormal metallic noises, and even lead to serious accidents that seriously affect the structural safety of the equipment, such as loose bolts and fatigue cracking of welds.

[0003] To eliminate the effects of this inertial force, existing technologies employ an eccentric block-throwing mechanism. In this mechanism, the eccentric block is rotatably mounted on the frame, and the centrifugal force generated by the block's rotation counteracts the inertial force generated by the screen body, thereby achieving vibration reduction.

[0004] The inventors discovered that while the centrifugal force generated by the eccentric slingshot provides horizontal balancing force, its vertical component acts as a new, additional inertial force on the frame, causing strong vertical vibrations. This not only significantly reduces the vibration damping effect of the mechanism but may also cause the screen body to operate in an unstable, compound vibration state, which in turn affects the normal stratification and screening trajectory of the material, ultimately reducing the cleaning effect and operational efficiency of the gravity screen for grains. Utility Model Content

[0005] This application provides a specific gravity screen designed to eliminate vibrations generated by the frame relative to a fixed surface, thereby achieving highly stable grain processing operations.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A specific gravity screen is provided, comprising a frame and a screen body; the screen body is connected to a reciprocating drive component, the reciprocating drive component being used to drive the screen body to reciprocate relative to the frame to generate inertial force; the specific gravity screen further includes: A first shaft is rotatably mounted on the frame and has a motion transmission mechanism with the screen body or the reciprocating drive component so that the first shaft rotates synchronously when the screen body moves. A second shaft is rotatably mounted on the frame and is arranged parallel to the first shaft; a transmission structure exists between the second shaft and the first shaft, such that when the first shaft rotates, the second shaft rotates at the same angular velocity but in the opposite direction; and Two sets of eccentric blocks are respectively disposed on the first shaft and the second shaft; When the first shaft and the second shaft rotate in opposite directions through the transmission structure, the two sets of eccentric blocks can generate two sets of centrifugal forces; in the horizontal direction, the resultant force of the two sets of centrifugal forces is equal in magnitude and opposite in direction to the component force of the inertial force; in the vertical direction, the resultant force of the two sets of centrifugal forces is zero.

[0007] In one possible implementation, the eccentric block includes: A mounting ring, fixedly sleeved on the first or second shaft, has an eccentric arm extending radially outward on its outer circumferential surface; and A centrifugal block is fixedly mounted at the extension end of the eccentric arm to generate centrifugal force when the mounting ring rotates.

[0008] In one possible implementation, the mounting ring has a positioning nut fixedly connected thereto, and an alignment bolt threadedly connected to the positioning nut; The alignment bolt can abut against the outer wall of the first shaft or the second shaft to restrict the relative movement of the mounting ring.

[0009] In one possible implementation, both the first shaft and the second shaft have recessed grooves on their outer peripheral walls for the insertion of the end of the alignment bolt.

[0010] In one possible implementation, the mounting ring has a pre-drilled hole extending radially therethrough; the positioning nut is fixedly disposed on the outer circumferential surface of the mounting ring and communicates with the pre-drilled hole.

[0011] In one possible implementation, the centrifugal block has a loading block on one side facing the mounting ring axis; The centrifuge block has a first through hole extending along the axial direction of the mounting ring, and the loading block has a second through hole communicating with the first through hole; furthermore, the centrifuge block further includes: Mounting bolts are inserted into the interconnected first and second through holes; and An anti-loosening nut, threaded onto the mounting bolt, is adapted to engage with the head of the mounting bolt to clamp the loading block and the centrifugal block.

[0012] In one possible implementation, the transmission structure includes: The drive gear is coaxially connected to the first shaft; and The driven gear is coaxially connected to the second shaft and meshes with the driving gear; The driving gear and the driven gear have the same number of teeth so that the rotational speeds of the first shaft and the second shaft are equal.

[0013] In one possible implementation, the reciprocating drive component includes: Two connecting rods are arranged horizontally side-by-side on the same side of the screen body, and both are hinged to the frame; a connecting rod is provided between the two connecting rods, and the two ends of the connecting rod are respectively hinged to the swing ends of the two connecting rods; and A turntable is rotatably mounted on the frame, its axis being parallel to the hinge axis of the connecting rod, and the turntable is connected to a rotating motor for driving its rotation. The turntable has a swing arm hinged to it, with the hinge position located outside the central axis of the turntable; and the swing end of the swing arm is hinged to the connecting rod, with the hinge position located between the two ends of the connecting rod.

[0014] In one possible implementation, the motion transmission mechanism includes: A power output gear is coaxially connected to the power output shaft of the rotating motor; and The power input gear is coaxially connected to the first shaft and meshes with the power output gear.

[0015] In one possible implementation, the first shaft is coaxially connected to the turntable to form the motion transmission mechanism.

[0016] In this embodiment, the kinetic energy of the reciprocating motion of the screen body is transferred to the first shaft via a motion transmission mechanism, causing it to rotate. Then, through a transmission structure, the second shaft is driven to rotate in the opposite direction at the same angular velocity. The eccentric blocks on the two sets of shafts rotate synchronously in opposite directions, and the centrifugal force they generate is superimposed in the horizontal direction, forming a balanced force that is equal in magnitude and opposite in direction to the horizontal component of the inertial force of the screen body. At the same time, since the two sets of eccentric blocks rotate symmetrically, their centrifugal force components in the vertical direction cancel each other out at all times, thus making the resultant force zero.

[0017] In other words, by using the symmetrical and oppositely rotating first and second shafts, the kinetic energy of the reciprocating motion of the screen body can be used to generate two sets of centrifugal forces. This not only achieves inertial force balance in the target direction (i.e., the horizontal direction), but also enables the self-cancellation of centrifugal forces in the non-target direction (i.e., the vertical direction), thus fundamentally avoiding the problem of additional vibration.

[0018] The specific gravity screen provided in this embodiment, compared with the prior art, can simultaneously balance inertial forces in the horizontal direction and cancel out additional forces in the vertical direction, thereby significantly reducing the overall vibration load transmitted to the frame. This not only effectively eliminates continuous vibration of the frame, prevents structural fatigue and abnormal noise, and extends the overall life of the equipment, but also provides a more stable and reliable working platform for grain screening, ultimately ensuring and improving the quality and efficiency of the cleaning operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of a gravity sieve provided in an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of the middle circle A; Figure 3 This is a three-dimensional structural diagram of the frame and reciprocating drive component used in the embodiments of this application in a combined state; Figure 4 This is a three-dimensional structural diagram of the motion transmission mechanism and transmission structure used in the embodiments of this application in a combined state; Figure 5 This is an exploded view of the motion transmission mechanism used in the embodiments of this application; Figure 6 This is a three-dimensional structural diagram of the eccentric block and loading block used in the embodiments of this application under an explosive state; Figure 7 This is a cross-sectional view of the eccentric block used in the embodiments of this application under an explosive state. Figure 8 This is a partial schematic diagram of the first shaft used in the embodiments of this application; Figure 9 This is a three-dimensional structural diagram of the second shaft used in the embodiments of this application; Figure 10 This is a three-dimensional structural diagram of the turntable and the first shaft in the combined state used in the embodiments of this application; Explanation of reference numerals in the attached drawings: 1. Frame; 2. Screen body; 3. Reciprocating drive component; 31. Connecting rod; 311. Connecting rod; 32. Turntable; 321. Swing arm; 4. Eccentric block; 41. Mounting ring; 411. Eccentric arm; 412. Positioning nut; 413. Alignment bolt; 414. Reserved hole; 42. Centrifugal block; 421. First through hole; 422. Mounting bolt; 423. Anti-loosening nut; 5. Motion transmission mechanism; 51. Power output gear; 52. Power input gear; 6. Transmission structure; 61. Driving gear; 62. Driven gear; 7. Loading block; 71. Second through hole; 8. Rotating motor; 81. Synchronous belt; 10. First shaft; 20. Second shaft; 30. Sinking trough. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 10 The specific gravity screen provided in this application will now be described. The specific gravity screen proposed in this application includes a frame 1, a screen body 2, a first shaft 10, a second shaft 20, and two sets of eccentric blocks 4.

[0026] The screen body 2 is connected to a reciprocating drive component 3, which is used to drive the screen body 2 to move back and forth relative to the frame 1 to generate inertial force.

[0027] The first shaft 10 is rotatably mounted on the frame 1 and has a motion transmission mechanism 5 between it and the screen body 2 or the reciprocating drive component 3. When the reciprocating drive component 3 is started, or when the screen body 2 moves under the drive of the reciprocating drive component 3, the motion transmission mechanism 5 can transmit kinetic energy to the first shaft 10, so that the first shaft 10 rotates relative to the frame 1.

[0028] The second shaft 20 is rotatably mounted on the frame 1 and is arranged parallel to the first shaft 10; there is a transmission structure 6 between the second shaft 20 and the first shaft 10 so that when the first shaft 10 rotates, the second shaft 20 rotates synchronously in the same angular velocity but in opposite directions.

[0029] Two sets of eccentric blocks 4 are respectively disposed on the first shaft 10 and the second shaft 20. In actual use, each set of eccentric blocks 4 can be single or multiple; and the number of eccentric blocks 4 on the first shaft 10 and the second shaft 20 can be the same or different. The following technical effects must be ensured: When the first shaft 10 and the second shaft 20 rotate synchronously through the transmission structure 6, the two sets of eccentric blocks 4 can generate two sets of centrifugal forces. In the horizontal direction, the resultant force of the two sets of centrifugal forces is equal in magnitude and opposite in direction to the component force of the inertial force. In the vertical direction, the resultant force of the two sets of centrifugal forces is zero.

[0030] In this embodiment, the kinetic energy of the reciprocating motion of the screen body 2 is transmitted to the first shaft 10 through the motion transmission mechanism 5, causing it to rotate; then, through the transmission structure 6, the second shaft 20 is driven to rotate in the opposite direction at the same angular velocity. The eccentric blocks 4 on the two sets of shafts rotate synchronously in opposite directions, and the centrifugal force they generate is superimposed in the horizontal direction, forming a balanced force that is equal in magnitude and opposite in direction to the horizontal component of the inertial force of the screen body 2; at the same time, since the two sets of eccentric blocks 4 rotate symmetrically, their centrifugal force components in the vertical direction cancel each other out at all times, so that the resultant force is zero.

[0031] In other words, by rotating symmetrically and in opposite directions, the first shaft 10 and the second shaft 20 can utilize the kinetic energy of the reciprocating motion of the screen body 2 to form two sets of centrifugal forces. This not only achieves inertial force balance in the target direction (i.e., the horizontal direction), but also enables the self-cancellation of centrifugal forces in the non-target direction (i.e., the vertical direction), fundamentally avoiding the problem of additional vibration.

[0032] The specific gravity screen provided in this embodiment, compared with the prior art, can simultaneously balance inertial forces in the horizontal direction and cancel out additional forces in the vertical direction, thereby significantly reducing the overall vibration load transmitted to the frame 1. This not only effectively eliminates the continuous vibration of the frame 1, prevents structural fatigue and abnormal noise, and extends the overall life of the equipment, but also provides a more stable and reliable working platform for grain screening, ultimately ensuring and improving the quality and efficiency of the cleaning operation.

[0033] In some embodiments, such as Figure 2 , Figure 6 and Figure 7 As shown, the eccentric block 4 includes a mounting ring 41 and a centrifugal block 42.

[0034] The mounting ring 41 is fixedly placed on the first shaft 10 or the second shaft 20. The specific fixing method can be welding, integral connection, or locking fit with mechanical structure. The outer peripheral surface of the mounting ring 41 has an eccentric arm 411 extending radially outward.

[0035] Centrifugal block 42 is fixedly mounted at the extension end of eccentric arm 411 to generate centrifugal force when mounting ring 41 rotates. The magnitude of this centrifugal force is proportional to the product of the total mass of eccentric block 4 and the eccentricity.

[0036] In some embodiments, such as Figure 6 and Figure 7 As shown, the mounting ring 41 has a positioning nut 412 fixedly connected thereto, and an alignment bolt 413 threadedly connected to the positioning nut 412.

[0037] In actual use, the positioning bolt 413 can be screwed in relative to the positioning nut 412 to abut against the outer wall of the first shaft 10 or the second shaft 20, thereby achieving the technical purpose of restricting the movement of the mounting ring 41 relative to the first shaft 10 or the second shaft 20.

[0038] In some embodiments, such as Figures 7 to 9 As shown, both the outer peripheral walls of the first shaft 10 and the second shaft 20 have recessed grooves 30, which are used for the end of the alignment bolt 413 to be inserted to ensure that the alignment bolt 413 can fully restrict the movement of the eccentric block 4.

[0039] In some embodiments, such as Figure 7 As shown, the mounting ring 41 has a reserved hole 414 that extends radially through it; the aforementioned positioning nut 412 is fixedly disposed on the outer circumferential surface of the mounting ring 41, and the inner cavity of the positioning nut 412 communicates with the reserved hole 414.

[0040] In actual use, the shaft of the alignment bolt 413, which is threadedly engaged with the positioning nut 412, is inserted into the reserved hole 414 so that the shaft can be inserted into the inner side of the mounting ring 41 and abut against the outer wall of the first shaft 10 or the second shaft 20.

[0041] In some embodiments, such as Figure 6 and Figure 7 As shown, the centrifugal block 42 has a loading block 7 on the side facing the mounting ring 41 axially; the loading block 7 and the centrifugal block 42 are detachably connected to facilitate manual adjustment of the overall mass of the eccentric block 4.

[0042] The centrifugal block 42 has a first through hole 421 that extends axially along the mounting ring 41, and the loading block 7 has a second through hole 71 that communicates with the first through hole 421.

[0043] Based on this, in this embodiment, the centrifugal block 42 also includes mounting bolts 422 and anti-loosening nuts 423.

[0044] Mounting bolt 422 is inserted into the interconnected first through hole 421 and second through hole 71.

[0045] The anti-loosening nut 423 is threaded onto the mounting bolt 422 and is suitable for engaging with the head of the mounting bolt 422 to clamp the loading block 7 and the centrifugal block 42, thereby achieving the combination of the loading block 7 and the centrifugal block 42.

[0046] In some embodiments, such as Figure 4 , Figure 8 and Figure 9 As shown, the transmission structure 6 includes a driving gear 61 and a driven gear 62.

[0047] The drive gear 61 is coaxially connected to the first shaft 10.

[0048] Driven gear 62 is coaxially connected to the second shaft 20 and meshes with drive gear 61 so that the second shaft 20 rotates synchronously when the first shaft 10 rotates.

[0049] The driving gear 61 and the driven gear 62 have the same number of teeth so that the rotational speeds of the first shaft 10 and the second shaft 20 are equal.

[0050] In some embodiments, such as Figure 1 and Figure 3 As shown, the reciprocating drive component 3 includes two connecting rods 31 and a turntable 32.

[0051] Two connecting rods 31 are arranged side by side in the horizontal direction on the same side of the screen body 2. Specifically, the screen body 2 moves relative to the frame 1 in the front-back direction. The two connecting rods 31 are arranged side by side in the front-back direction and are both hinged to the frame 1 with the left-right direction as the axis.

[0052] A connecting rod 311 is provided between the two connecting rods 31. The two ends of the connecting rod 311 are respectively hinged to the swing ends of the two connecting rods 31, and the hinge axis is parallel to the hinge axis between the connecting rod 31 and the frame 1.

[0053] The turntable 32 is rotatably mounted on the frame 1, with its axis parallel to the hinge axis of the connecting rod 311, and the turntable 32 is connected to a rotating motor 8 for driving its rotation.

[0054] A swing arm 321 is hinged to the turntable 32. The hinge position of the swing arm 321 is outside the central axis of the turntable 32, that is, it is eccentrically set. The swing end of the swing arm 321 is hinged to the connecting rod 311, and its hinge position is between the two ends of the connecting rod 311 (specifically, the connection point between the connecting rod 311 and the two connecting rods 31).

[0055] In some embodiments, such as Figure 1 and Figure 3 As shown, the rotating motor 8 is fixedly mounted on the frame 1, and a synchronous belt 81 is sleeved on its power output shaft. The synchronous belt 81 wraps around the outer circumference of the turntable 32 so that when the rotating motor 8 starts, the synchronous belt 81 moves horizontally and the turntable 32 rotates.

[0056] By adopting the above technical solution, the rotating motor 8 is fixed on the outside of the turntable 32, thereby avoiding interference between the structures and making it easier to transfer the generated kinetic energy.

[0057] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, the motion transmission mechanism 5 includes a power output gear 51 and a power input gear 52.

[0058] The power output gear 51 is coaxially connected to the power output shaft of the rotating motor 8. In this embodiment, the power output gear 51 is located on the side of the synchronous belt 81 facing away from the rotating motor 8, and is positioned and combined by the cooperation of grooves and protrusions.

[0059] The power input gear 52 is coaxially connected to the first shaft 10 and meshes with the power output gear 51 to achieve the technical purpose of synchronous rotation of the first shaft 10 when the rotating motor 8 is started.

[0060] In some embodiments, such as Figure 10 As shown, the first shaft 10 is coaxially connected to the turntable 32 to form the aforementioned motion transmission mechanism. Specifically, the aforementioned motion transmission mechanism includes a coupling coaxially connected to the inner side of the turntable 32, which is also connected to the end of the first shaft 10 to achieve the technical objective of synchronous rotation of the first shaft 10 when the turntable 32 rotates.

[0061] Compared to the transmission mode that uses a power output gear 51 and a power input gear 52 to connect to the rotating motor 8, connecting the turntable 32 coaxially with the first shaft 10 can ensure that the angular velocity and rotation direction of the first shaft 10 and the turntable 32 are highly consistent.

[0062] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A specific gravity screen, comprising a frame and a screen body; the screen body is connected to a reciprocating drive component, the reciprocating drive component being used to drive the screen body to reciprocate relative to the frame to generate inertial force; characterized in that, The specific gravity screen also includes: A first shaft is rotatably mounted on the frame and has a motion transmission mechanism with the screen body or the reciprocating drive component so that the first shaft rotates synchronously when the screen body moves. A second shaft is rotatably mounted on the frame and is arranged parallel to the first shaft; a transmission structure exists between the second shaft and the first shaft, such that when the first shaft rotates, the second shaft rotates at the same angular velocity but in the opposite direction; and Two sets of eccentric blocks are respectively disposed on the first shaft and the second shaft; When the first shaft and the second shaft rotate in opposite directions through the transmission structure, the two sets of eccentric blocks can generate two sets of centrifugal forces; in the horizontal direction, the resultant force of the two sets of centrifugal forces is equal in magnitude and opposite in direction to the component force of the inertial force; in the vertical direction, the resultant force of the two sets of centrifugal forces is zero.

2. The specific gravity sieve as described in claim 1, characterized in that, The eccentric block includes: A mounting ring, fixedly sleeved on the first or second shaft, has an eccentric arm extending radially outward on its outer circumferential surface; and A centrifugal block is fixedly mounted at the extension end of the eccentric arm to generate centrifugal force when the mounting ring rotates.

3. The specific gravity sieve as described in claim 2, characterized in that, The mounting ring has a positioning nut that is fixedly connected to it, and an alignment bolt that is threadedly connected to the positioning nut; The alignment bolt can abut against the outer wall of the first shaft or the second shaft to restrict the relative movement of the mounting ring.

4. The specific gravity sieve as described in claim 3, characterized in that, Both the first shaft and the second shaft have recessed grooves on their outer peripheral walls, which are used for embedding the ends of the alignment bolts.

5. The specific gravity sieve as described in claim 3, characterized in that, The mounting ring has a pre-drilled hole that extends radially through it; the positioning nut is fixedly disposed on the outer circumferential surface of the mounting ring and communicates with the pre-drilled hole.

6. The specific gravity sieve as described in claim 2, characterized in that, The centrifugal block has a loading block on one side facing the mounting ring axis; The centrifuge block has a first through hole extending along the axial direction of the mounting ring, and the loading block has a second through hole communicating with the first through hole; furthermore, the centrifuge block further includes: Mounting bolts are inserted into the interconnected first and second through holes; and An anti-loosening nut, threaded onto the mounting bolt, is adapted to engage with the head of the mounting bolt to clamp the loading block and the centrifugal block.

7. The specific gravity sieve as described in claim 1, characterized in that, The transmission structure includes: The drive gear is coaxially connected to the first shaft; and The driven gear is coaxially connected to the second shaft and meshes with the driving gear; The driving gear and the driven gear have the same number of teeth so that the rotational speeds of the first shaft and the second shaft are equal.

8. The specific gravity sieve as described in claim 1, characterized in that, The reciprocating drive component includes: Two connecting rods are arranged horizontally side-by-side on the same side of the screen body, and both are hinged to the frame; a connecting rod is provided between the two connecting rods, and the two ends of the connecting rod are respectively hinged to the swing ends of the two connecting rods; and A turntable is rotatably mounted on the frame, its axis being parallel to the hinge axis of the connecting rod, and the turntable is connected to a rotating motor for driving its rotation. The turntable has a swing arm hinged to it, with the hinge position located outside the central axis of the turntable; and the swing end of the swing arm is hinged to the connecting rod, with the hinge position located between the two ends of the connecting rod.

9. The specific gravity sieve as described in claim 8, characterized in that, The motion transmission mechanism includes: A power output gear is coaxially connected to the power output shaft of the rotating motor; and The power input gear is coaxially connected to the first shaft and meshes with the power output gear.

10. The specific gravity sieve as described in claim 8, characterized in that, The first shaft is coaxially connected to the turntable to form the motion transmission mechanism.

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