Specific gravity grading stoning machine

Abstract

A sieve plate of an upper-layer sieve lattice of the specific gravity grading stoning machine is provided with a large-hole area, a small-hole area, a reverse blowing area and a stone falling area, the aperture of sieve holes of the large-hole area is far larger than the grain size of grains so that heavy grains can fall conveniently, accumulation of grain materials on the sieve plate is reduced, and the aperture of the sieve holes of the small-hole area is smaller than the grain size of the grains so that the grain materials can fall conveniently. And in the reverse blowing area, heavy grains ascending along with the stones are reversely blown back to the large hole area through reverse blowing, excessive heavy grains are prevented from entering the stone falling area, material accumulation in the stone falling area is avoided, stone falling holes in the stone falling area are oblong holes, falling of the stones is facilitated, and therefore the stone removing and grading effects are effectively improved. The partition plates are arranged in the air suction opening and the upper screen cavity of the specific gravity grading stoning machine, the partition plates divide the inner cavity of the air suction opening and the upper screen cavity into the two air suction channels, and the air force of the two air suction channels is adjusted through the air adjusting turning plates, so that the air suction amount is reasonably distributed on the screen surface of the upper-layer screen lattice, and the material grading and impurity removing effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of grain impurity and stone removing equipment, and in particular relates to a specific gravity classification stone removing machine. Background Art

[0002] The de-stoner is a general-purpose equipment used for grading and de-stoneing grain particles (wheat, soybeans, corn, etc.). The grain material enters the inclined upper screen plate in the screen box through the feed inlet. Due to the vibration of the de-stoner, the material is evenly covered on the entire upper screen. Due to the different specific gravities and particle sizes of the materials, the grain on the upper screen is automatically stratified on the upper screen surface under the combined action of vibration and airflow. The upper layer is the material with a lighter specific gravity, and the lower layer is the material with a heavier specific gravity. Some light impurities such as husks and dust are carried by the air flow and discharged from the air intake port, while the straw with a smaller specific gravity and the grain are separated. blighted As the grain accumulates, it will move downward along the inclination direction of the upper screen and be discharged from the lightweight outlet connected to the upper cavity of the upper screen. The gravel and grain particles with heavier specific gravity fall from the front end and the large screen holes in the middle of the upper screen to the lower screen.

[0003] Grain particles and stones that fall on the lower screen will be graded up and down according to their specific gravity under the combined effect of screen vibration and air suction, because the specific gravity of stones is greater than that of grain particles. The grain on the upper layer will be blown to the lower side of the screen surface at the back-blowing air port. As the material layer thickens, it flows to the lowest end under the action of gravity and is discharged from the heavy grain port. The heavier stones close to the screen surface will move upward along the screen surface under the action of comprehensive external forces, thus achieving the purpose of removing stones and other impurities in the grain. The stone remover has the advantages of high production efficiency, good grading, stone removal and impurity removal performance, low energy consumption, low noise and no dust emission.

[0004] However, the mesh holes of the upper screen in the existing stone remover are all large, and the grain falls faster, thereby increasing the thickness of the material on the lower screen surface and the stone removal burden. It also has defects such as short screening process and narrow material discharge channel, which leads to a relatively large required suction volume and low output.

[0005] In addition, the existing stone removal machine has a large screen area, and its exhaust system needs to cover the entire screen surface through an air suction port. However, due to the limitation of the diameter of the air suction port and the connecting pipe, the entire screen surface cannot be evenly blown, resulting in strong wind in some areas of the screen and weak wind in other areas. The wind force has a great influence on the stone removal and classification effects, and the uneven wind force seriously affects the stone removal and classification effects. Summary of the invention

[0006] To sum up, in order to overcome the shortcomings of the existing technical problems, the utility model provides a specific gravity grading stone removing machine, the sieve plate of the upper screen grid of the specific gravity grading stone removing machine has a large hole area, a small hole area, a back-blowing area and a rock-falling area. The sieve hole diameter of the large hole area is much larger than the grain particle diameter, which is convenient for the heavy grain to fall and reduce the accumulation of grain materials on the sieve plate. The sieve hole diameter of the small hole area is smaller than the grain particle diameter, which is convenient for the stone and some heavy grain to go up and ventilate. The back-blowing area uses back-blowing air to blow the heavy grain that goes up with the stone back to the large hole area, avoiding too much heavy grain from entering the rock-falling area, causing material accumulation in the rock-falling area. The rock-falling holes in the rock-falling area are oblong holes, which are convenient for the stone and heavy grain to fall, thereby effectively improving the stone removal and grading effects.

[0007] In order to solve the above technical problems, the technical solution provided by the utility model is implemented as follows:

[0008] A specific gravity classification stone removing machine comprises: a shell, an upper screen grid and a lower screen grid arranged obliquely in the shell, the upper screen grid and the lower screen grid divide the inner cavity of the shell into an upper screen cavity located above the upper screen grid and a lower screen cavity located between the upper screen grid and the lower screen grid, a feed box connected to the upper screen cavity is arranged on the shell on the side of the higher height of the upper screen grid, an air suction port connected to the upper screen cavity is arranged in the middle part of the upper end of the shell, the air suction port is connected to the air suction system arranged outside the shell, a light weight outlet opening downward is arranged on the shell on the side of the lower height of the upper screen grid, a heavy weight outlet opening downward is arranged on the shell on the side of the lower height of the lower screen grid, the light weight outlet is connected to the upper screen cavity, the heavy weight outlet is connected to the lower screen cavity, a stone outlet opening downward is arranged on the shell on the side of the higher height of the lower screen grid, the stone outlet is connected to the lower screen cavity, and a power device for driving the shell to vibrate is arranged at the lower end of the shell, wherein:

[0009] The upper screen grid includes a screen frame and a screen plate, the screen frame supports the screen plate, and the screen plate is connected to the upper end or the lower end of the screen frame. The screen plate has a rockfall zone, a backblowing zone, a small hole zone and a large hole zone arranged in sequence along its inclined direction from high to low. The large hole zone is provided with densely arranged large sieve holes, the aperture of the large sieve holes is larger than the particle size of the material, the small hole zone is provided with densely arranged small sieve holes, the aperture of the small sieve holes is smaller than the particle size of the material, the backblowing zone is provided with densely arranged backblowing holes, the opening of the backblowing holes faces the small hole zone, and the rockfall zone is provided with densely arranged rockfall holes.

[0010] Furthermore, a material stopper strip is provided on the sieve plate of the upper sieve grid. The material stopper strip is connected to the upper end surface of the sieve plate and is located in the large hole area. The material stopper strip is arranged along a direction perpendicular to the inclination direction of the upper sieve grid. The material stopper strip divides the large hole area into two parts with different areas, wherein the area of ​​the part close to the small hole area is smaller than the area of ​​the other part.

[0011] Furthermore, the back-blowing holes in the back-blowing zone are fish-scale holes, and the openings of the fish-scale holes face the small hole zone.

[0012] Furthermore, the rock-falling hole is an oblong hole.

[0013] Furthermore, the aperture of the large sieve holes is more than 1.5 times the particle size of the material.

[0014] Furthermore, it also includes a partition plate, which is arranged in the air suction port and the upper screen cavity. There is a material passing gap between the lower end of the partition plate and the upper screen grid. The partition plate divides the inner cavity of the air suction port and the upper screen cavity into two air suction channels.

[0015] Furthermore, the partition plate has an upper vertical portion, a middle inclined portion and a lower vertical portion connected in sequence, the upper vertical portion is located in the air suction port, the middle inclined portion and the lower vertical portion are located in the upper screen cavity, the lower end of the lower vertical portion corresponds to the material blocking strip on the upper screen grid, and there is a material passing gap between the lower end of the lower vertical portion and the upper screen grid, the upper vertical portion divides the inner cavity of the air suction port into two channels, and air regulating flaps are provided in both channels.

[0016] Furthermore, a material leveling device is provided in the feed box, and a material guide plate is provided at the lower end of the feed box. The material guide plate is used to guide the material flowing out of the feed box to the small hole area of ​​the upper screen. The material guide plate is arranged downwardly at an angle, and there is a gap between its lower end and the upper screen.

[0017] Furthermore, it also includes a back-blowing plate, which is located in the lower screen cavity and covers the top of the stone outlet. The back-blowing plate is connected to the shell, and the gap between the back-blowing plate and the stone outlet is adjustable.

[0018] Furthermore, it also includes a return plate, which is located in the lower screen chamber and connected to the shell, and is arranged below the large hole area between the small hole area and the baffle plate. The return plate is arranged at an angle, and is arranged downward in the direction from the large hole area to the small hole area, and there is a gap between its lowest end and the lower screen grid.

[0019] The beneficial effects of the utility model are:

[0020] 1. The sieve plate of the upper screen grid of the utility model has a rock-falling area, a back-blowing area, a small-hole area and a large-hole area which are arranged in sequence. The sieve hole diameter of the large-hole area is larger than the grain particle diameter, so that the heavy grain can fall quickly and reduce the accumulation of materials on the upper screen grid. The back-blowing area back-blows the heavy grain moving to the rock-falling area along with the stones back to the large-hole area or / and the small-hole area through backblowing, so as to avoid too much heavy grain entering the rock-falling area along with the stones, causing the accumulation of materials in the rock-falling area. The rock-falling holes in the rock-falling area are oblong holes, and the diameter of the oblong holes is much larger than the grain particle diameter, so that the stones and heavy grain can fall easily, thereby effectively improving the stone removal and grading effect, and can also reduce the light grain mixed in the heavy grain, and improve the grading effect.

[0021] 2. The material blocking strips on the screen plate of the upper screen grid of the utility model block the materials, so that the materials are accumulated in front of the material blocking strips. Under the action of vibration and airflow, the accumulated materials are graded, and the light straw and chaff float on the upper layer, and the heavy grain and stone are located in the lower layer, which can accelerate the grading of heavy grain and light materials and improve the grading effect.

[0022] 3. The partition plate of the utility model divides the air suction port and the upper screen cavity into two air suction channels, and both are provided with air regulating flaps, which can adjust the wind force separately, thereby reasonably arranging the wind force and reasonably distributing the wind force on the screen surface of the upper screen grid, which is conducive to extracting light and fine impurities and grading, and improving the material grading and impurity removal effect.

[0023] 4. The setting of the back-blowing air plate of the utility model can guide the airflow entering the lower screen cavity from the stone outlet, and use the back-blowing airflow to blow the grain on the lower screen grid flowing toward the stone outlet back toward the heavy outlet, thereby reducing or avoiding the discharge of grain particles from the stone outlet. At the same time, the gap between the back-blowing air plate and the stone outlet is adjustable, and the size of the back-blowing airflow can be adjusted by adjusting the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the upper screen grid of the utility model;

[0026] Figure 3 For this utility model Figure 2 A schematic diagram of a top view structure;

[0027] Figure 4 For this utility model Figure 3 A magnified schematic diagram of part A;

[0028] Figure 5 For this utility model Figure 3 An enlarged schematic diagram of part B;

[0029] Figure 6 For this utility model Figure 3 An enlarged schematic diagram of part C of FIG.

[0030] Figure 7 For this utility model Figure 6 EE cross-sectional structure diagram;

[0031] Figure 8 For the utility model Figure 7 FF cross-sectional structure diagram;

[0032] Fig. 9 For this utility model Figure 3 An enlarged schematic diagram of part D of FIG. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0034] like Figures 1 to 9 As shown, a specific gravity classification stone removal machine comprises: a shell 5, wherein an upper screen grid 14 and a lower screen grid 15 are arranged up and down in the shell 5, and the upper screen grid 14 and the lower screen grid 15 are arranged obliquely in the shell 5, and the material moves obliquely downward along the inclination direction of the upper screen grid 14 and the lower screen grid 15, and the upper screen grid 14 and the lower screen grid 15 divide the inner cavity of the shell 5 into an upper screen cavity 18 located above the upper screen grid 14 and a lower screen cavity 18 located between the upper screen grid 14 and the lower screen grid 15. A feed box 7 connected with the upper sieve cavity 18 is arranged on the shell body 5 on the side with a higher height of the upper sieve grid 14, a material leveling device 12 is arranged in the feed box 7, and a material guide plate 13 is arranged at the lower end of the feed box 7. The material guide plate 13 is used to guide the material flowing out of the feed box 7 to the small hole area 102 of the upper sieve grid 14, and the material guide plate 13 is arranged downwardly and there is a gap between the lower end thereof and the upper sieve grid 14. An air suction port 8 connected to the upper sieve chamber 18 is provided in the middle of the upper end of the shell 5, and the air suction port 8 is connected to the air suction system arranged outside the shell 5. A light weight outlet 9 opening downward is provided on the shell 5 on the side of the lower height of the upper sieve grid 14, and a heavy weight outlet 10 opening downward is provided on the shell 5 on the side of the lower height of the lower sieve grid 15. The light weight outlet 9 is connected to the upper sieve chamber 18, and the heavy weight outlet 10 is connected to the lower sieve chamber 19. A stone outlet 11 opening downward is provided on the shell 5 on the side of the higher height of the lower sieve grid 15, and the stone outlet 11 is connected to the lower sieve chamber 19. A power device for driving the shell 5 to vibrate is provided at the lower end of the shell 5.

[0035] The upper screen grid 14 includes a screen frame 3 and a screen plate 1. The screen frame 3 supports the screen plate 1. The screen plate 1 is connected to the upper end or the lower end of the screen frame 3. The screen plate 1 has a rockfall area 104, a backwash area 103, a small hole area 102 and a large hole area 101 arranged in sequence along the inclined direction from high to low. The large hole area 101 is provided with densely arranged large sieve holes 105. The aperture of the large sieve holes 105 is larger than the particle size of the material. The aperture of the large sieve holes 105 is more than 1.5 times the particle size of the material. The small hole area 102 is provided with densely arranged small sieve holes 106. The aperture of the small sieve holes 106 is smaller than the particle size of the material. The backwash area 103 is provided with densely arranged backwash holes 107. The backwash holes 107 are fish scale holes, and the opening of the fish scale holes faces the small hole area 102. The rockfall area 104 is provided with densely arranged rockfall holes 108. The rock-falling hole 108 is an oblong hole, and a material-blocking strip 2 is also provided on the sieve plate 1 of the upper sieve grid 14. The material-blocking strip 2 is connected to the upper end surface of the sieve plate 1 and is located in the large hole area 101. The material-blocking strip 2 is arranged along a direction perpendicular to the inclination direction of the upper sieve grid 14. The material-blocking strip 2 divides the large hole area 101 into two parts with different areas, wherein the area of ​​the part close to the small hole area 102 is smaller than the area of ​​the other part.

[0036] A partition plate 6 is provided in the air suction port 8 and the upper sieve chamber 18, and the partition plate 6 has an upper vertical portion 61, a middle inclined portion 62 and a lower vertical portion 63 connected in sequence, the upper vertical portion 61 is located in the air suction port 8, the middle inclined portion 62 and the lower vertical portion 63 are located in the upper sieve chamber 18, the lower end of the lower vertical portion 63 corresponds to the material blocking strip 2 on the upper sieve grid 14, and there is a material passing gap between the lower end of the lower vertical portion 63 and the upper sieve grid 14, the upper vertical portion 61 divides the inner cavity of the air suction port 8 into two air outlet channels, and air regulating flaps 20 are provided in the two air outlet channels, the middle inclined portion 62 and the lower vertical portion 63 divide the upper sieve chamber 18 into two air passages, and the two air outlet channels are respectively connected to the two air passages to form two air suction channels, and the two air suction channels correspond to the screen surface of the upper sieve grid 14 on both sides of the material blocking strip 2. The two suction channels can be connected to a set of suction systems respectively, or they can share a set of suction systems. The two air-adjusting flaps 20 can be set to adjust the two suction channels respectively, so as to adjust the wind force of the two areas of the screen surface of the upper screen grid 14. When the material is accumulated in front of the retaining bar 2 of the upper screen grid 14, the wind force can be appropriately increased, and when there is less material behind the retaining bar 2, the wind force can be appropriately reduced. A back-blowing plate 17 is also set in the lower screen chamber 19. The back-blowing plate 17 covers the top of the stone outlet 11, and the back-blowing plate 17 is connected to the housing 5, and the gap between the back-blowing plate 17 and the stone outlet 11 is adjustable. A return plate 16 is also provided in the lower screen chamber 19. The return plate 16 is connected to the shell 5 and is arranged below the large hole area 101 between the small hole area 102 and the baffle plate. The return plate 16 is arranged obliquely, and is arranged obliquely downward from the large hole area 101 to the small hole area 102, and there is a gap between its lowest end and the lower screen grid 15.

[0037] When in use, the grain material enters from the feed box 7, and under the action of the material leveling device 12 and the guide plate 13, the grain material evenly falls to the small hole area 102 of the sieve plate 1 of the upper sieve grid 14, and the suction system and the power device are started. Under the action of the power device, the housing 5 and the upper and lower sieve grids 15 in the housing 5 vibrate. At the same time, under the action of the suction system, the air flow enters from the sieve holes of the lower sieve grid 15 and the stone outlet 11, first passes through the lower sieve cavity 19, then passes through the upper sieve, and then passes through the upper sieve cavity 18, and finally flows out from the suction port 8 to enter the dust removal system.

[0038] The grain material falling on the small hole area 102 of the sieve plate 1 of the upper sieve grid 14 is gradually flattened and moves downward along the inclination direction of the upper sieve grid 14 under the action of vibration. At the same time, under the action of airflow, the husks, dust and other light impurities in the grain material are carried by the airflow and discharged from the air suction port 8. The grain material moving downward is blocked by the blocking bar 2, and the grain material is accumulated in front of the blocking bar 2. At the same time, under the action of vibration and airflow, the accumulated materials are layered, and the light grain (such as rotten grain and broken grain) and straw impurities with lighter specific gravity are located on the upper layer, and the heavy grain with heavier specific gravity is located on the lower layer. Grains and stones are located in the lower layer. As more and more grain materials are piled up in front of the blocking bar 2, the upper layer materials pass over the blocking bar 2 and enter the rear of the blocking bar 2. Since the materials passing over the blocking bar 2 contain impurities such as light grains and straws, as well as heavy grains, and the sieve plate 1 behind the blocking bar 2 is all large-hole area 101, the materials passing over the blocking bar 2 are suspended under the action of vibration and airflow, and the impurities such as light grains and straws move downward along the inclination direction of the sieve plate 1, and finally flow out from the light outlet 9, while the heavy grains pass through the large sieve holes 105 and fall to the lower sieve grid 15. The aperture of the sieve holes of the lower sieve grid 15 is smaller than the particle size of the grain particles.

[0039] Under the action of vibration and airflow, the heavy grain and gravel with a heavier specific gravity in the lower layer of the grain material accumulated in front of the blocking bar 2 are divided into two parts. One part falls from the large sieve hole 105 in front of the blocking bar 2, and then falls to the area of ​​the lower sieve grid 15 corresponding to the small hole area 102 of the upper sieve grid 14 under the guidance of the return plate 16. The other part of the heavy grain and gravel moves upward along the inclined direction of the upper sieve grid 14, passing through the small hole area 102 and the back-blowing area 103 in turn. When passing through the back-blowing area 103, the back-blowing airflow flows out from the opening of the back-blowing hole 107 and blows toward the material. Since the specific gravity of the stone is greater than the specific gravity of the heavy grain, under the back-blowing effect of the airflow, the heavy grain is back-blown back to the large hole area 101, while the stone continues to move upward obliquely, passes through the back-blowing area 103 and enters the stone falling area 104. In the stone falling area 104, the stone falls through the stone falling hole 108, slides onto the lower sieve 15 after passing through the back-blowing air plate 17, and is finally discharged from the stone outlet 11.

[0040] The heavy grains and stones falling from the large sieve holes 105 at the front of the retaining bar 2 fall on the side of the lower screen grid 15 close to the stone outlet 11 under the guidance of the return plate, and gradually accumulate at the falling point. Similarly, under the action of vibration and airflow, the accumulated materials are layered. Since the specific gravity of the stones is greater than that of the heavy grains, the heavy grains are located in the upper layer and the stones are located in the lower layer. Under the action of vibration and airflow, the heavy grains in the upper layer move downward along the inclination direction of the lower screen grid 15, and finally flow out from the heavy outlet 10, while the mixed heavy grains and stones in the lower layer are The material in the stone screen moves upward along the inclination direction of the lower screen grid 15, that is, flows toward the stone outlet 11. Since there is airflow entering the lower screen cavity 19 from the stone outlet 11, the airflow entering from the stone outlet 11 is blown toward the material flowing upward obliquely under the guiding effect of the back-blowing air plate 17, and a back-blowing effect is produced on the material flowing upward obliquely. Since the specific gravity of the stone is greater than that of the heavy grain, under the action of the back-blowing airflow, the heavy grain moving upward obliquely is blown back to the landing point and is re-screened in layers, while the stone continues to move upward obliquely and is finally discharged from the stone outlet 11.

[0041] The heavy grains falling from the large sieve holes 105 at the rear of the retaining bar 2 directly flow obliquely downward along the lower sieve grid 15 under the action of vibration and airflow, and finally flow out of the heavy grain outlet 10.

[0042] At this point, the de-stoning, impurity removal and grading of the grain materials are completed, and the light impurities such as husks and dust in the grain materials are discharged from the air intake port 8 along with the air flow, the stones in the grain materials are discharged from the stone outlet 11, the lighter grains such as chaff and broken grains and impurities such as straw are discharged from the light outlet 9, and the heavy grains with full grains flow out from the heavy outlet 10.

[0043] It should be noted that the above-described embodiments are illustrative of the technical solution of the utility model rather than limiting. Equivalent substitutions made by ordinary technicians in the relevant technical field or other modifications made according to the prior art should be included in the scope of rights required by the utility model as long as they do not exceed the idea and scope of the technical solution of the utility model.

Claims

1. A gravity classification stone removing machine, comprising: A shell (5), wherein the shell (5) has an upper screen grid (14) and a lower screen grid (15) arranged obliquely, the upper screen grid (14) and the lower screen grid (15) dividing the inner cavity of the shell (5) into an upper screen cavity (18) located above the upper screen grid (14) and a lower screen cavity (19) located between the upper screen grid (14) and the lower screen grid (15), a feed box (7) connected to the upper screen cavity (18) is arranged on the shell (5) on the side where the upper screen grid (14) is higher, and an air suction port (8) connected to the upper screen cavity (18) is arranged in the middle of the upper end of the shell (5), and the air suction port (8) is connected to an air suction system arranged outside the shell (5). The shell (5) on the side of the lower height of the upper screen grid (14) is provided with a light weight outlet (9) opening downwards, the shell (5) on the side of the lower height of the lower screen grid (15) is provided with a heavy weight outlet (10) opening downwards, the light weight outlet (9) is communicated with the upper screen cavity (18), the heavy weight outlet (10) is communicated with the lower screen cavity (19), the shell (5) on the side of the higher height of the lower screen grid (15) is provided with a stone outlet (11) opening downwards, the stone outlet (11) is communicated with the lower screen cavity (19), and the lower end of the shell (5) is provided with a power device for driving the shell (5) to vibrate, characterized in that: The upper screen grid (14) comprises a screen frame (3) and a screen plate (1), wherein the screen frame (3) supports the screen plate (1), and the screen plate (1) is connected to the upper end or the lower end of the screen frame (3), and the screen plate (1) has a rockfall area (104), a back-blowing area (103), a small hole area (102), and a large hole area (101) arranged in sequence along its inclined direction from high to low, and the large hole area (101) is provided with large screen holes (105) densely arranged. The aperture of the large sieve hole (105) is larger than the particle size of the material, the small hole area (102) is provided with densely arranged small sieve holes (106), the aperture of the small sieve holes (106) is smaller than the particle size of the material, the back-blowing area (103) is provided with densely arranged back-blowing holes (107), the opening of the back-blowing holes (107) faces the small hole area (102), and the rockfall area (104) is provided with densely arranged rockfall holes (108).

2. The gravity classification stone removing machine according to claim 1, characterized in that: The sieve plate (1) of the upper sieve grid (14) is further provided with a material blocking strip (2), the material blocking strip (2) being connected to the upper end surface of the sieve plate (1) and being located in the large hole area (101), the material blocking strip (2) being arranged along a direction perpendicular to the inclination direction of the upper sieve grid (14), the material blocking strip (2) dividing the large hole area (101) into two parts of different areas, wherein the area of ​​the part close to the small hole area (102) is smaller than the area of ​​the other part.

3. The gravity classification stone removing machine according to claim 1, characterized in that: The backflush holes (107) of the backflush area (103) are fish scale holes, and the openings of the fish scale holes face toward the small hole area (102).

4. The gravity classification stone removing machine according to claim 1, characterized in that: The rockfall hole (108) is an oblong hole.

5. The gravity classification stone removing machine according to any one of claims 1 to 4, characterized in that: It also includes a partition plate (6), which is arranged in the air suction port (8) and the upper sieve cavity (18), and there is a material passing gap between the lower end of the partition plate (6) and the upper sieve grid (14), and the partition plate (6) divides the inner cavity of the air suction port (8) and the upper sieve cavity (18) into two air suction channels.

6. The gravity classification stone removing machine according to claim 5, characterized in that: The partition plate (6) comprises an upper vertical portion (61), a middle inclined portion (62) and a lower vertical portion (63) which are connected in sequence; the upper vertical portion (61) is located in the air suction port (8); the middle inclined portion (62) and the lower vertical portion (63) are located in the upper sieve cavity (18); the lower end of the lower vertical portion (63) corresponds to the material blocking strip (2) on the upper sieve grid (14); and a material passing gap exists between the lower end of the lower vertical portion (63) and the upper sieve grid (14); the upper vertical portion (61) divides the inner cavity of the air suction port (8) into two channels, and both channels are provided with air regulating flaps (20).

7. The gravity classification stone removing machine according to any one of claims 1 to 4, characterized in that: The return plate (16) is located in the lower screen cavity (19) and connected to the housing (5). The return plate (16) is arranged below the large hole area (101) between the small hole area (102) and the baffle plate. The return plate (16) is arranged obliquely, and is arranged obliquely downward along the direction from the large hole area (101) to the small hole area (102). There is a gap between the lowest end of the return plate and the lower screen grid (15).

8. The gravity classification stone removing machine according to claim 7, characterized in that: It also includes a back-blowing plate (17), which is located in the lower sieve cavity (19) and covers the top of the stone outlet (11). The back-blowing plate (17) is connected to the housing (5), and the gap between the back-blowing plate (17) and the stone outlet (11) is adjustable.

9. The gravity classification stone removing machine according to claim 1, characterized in that: The feed box (7) is provided with a material leveling device (12), and the lower end of the feed box (7) is provided with a material guide plate (13), which is used to guide the material flowing out of the feed box (7) to the small hole area (102) of the upper screen grid (14). The material guide plate (13) is arranged to be inclined downward, and there is a gap between the lower end of the material guide plate and the upper screen grid (14).

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