Sunflower seed shelling equipment with secondary skinning function

Abstract

The present application belongs to the technical field of shelling equipment, and in particular to a sunflower seed shelling equipment with secondary skin removing function, comprising a sheller, an elevator, a boiler and a separation screen, wherein the elevator, the sheller and the boiler are sequentially connected, the separation screen is obliquely arranged and located below the boiler, a sieve plate and a discharge port are arranged on the separation screen, an upper feeding port is arranged on the elevator and located directly below the sieve plate, a separation mechanism two is arranged above the sieve plate, and a separation mechanism one is arranged above the upper feeding port and connected with the discharge port; the separation mechanism one comprises a gathering hopper one. The present application can significantly reduce the skin rate of unshelled seeds, avoid shell accumulation and improve the efficiency of the shelling cycle through two-stage gradient negative pressure adsorption and airflow turbulence caused by the variable pitch mechanism. Meanwhile, the present application has the double adjustment capability of air door and variable pitch, can adapt to different material characteristics, and can enhance the stability of the production line and the purity of the product.

Description

Technical Field

[0001] This invention relates to the field of shelling equipment technology, and in particular to a sunflower seed shelling device with a secondary peeling function. Background Technology

[0002] Sunflower seed shelling is a crucial step in sunflower seed kernel processing, as shelling efficiency and the effectiveness of kernel-hull separation directly impact subsequent processing quality and product purity. Common sunflower seed shelling equipment typically includes components such as a sheller, elevator, fluidized bed, and separating screen. The basic workflow is as follows: after being crushed by the sheller, the sunflower seeds pass through the fluidized bed using airflow to remove most of the husks, followed by sieving through the separating screen, thus achieving initial kernel-hull separation. However, in actual production, due to factors such as varying sunflower seed size, moisture content, and improper adjustment of the shelling roller gap, a considerable proportion of unshelled seeds and attached sunflower husks remain in the material after one fluidized bed shell removal and sieving process. These unshelled seeds usually need to be returned to the sheller for secondary shelling, but if the returned husks are not effectively removed, dust will accumulate inside the sheller, affecting shelling efficiency and increasing the burden on subsequent kernel-hull separation.

[0003] While some existing dehulling devices incorporate a secondary peeling structure, most employ a single negative pressure adsorption method for secondary processing of the sieved material. This approach has several drawbacks: First, during negative pressure adsorption, the material often accumulates, making it difficult to effectively remove the bottom layer of sunflower seed husks, resulting in unsatisfactory secondary peeling. Second, for sunflower seed husks that are tightly adhered or interspersed among unhulled seeds, relying solely on negative pressure is insufficient for complete separation. Third, there is a lack of proactive control over the material's turbulence, making it impossible to flexibly adjust the separation intensity based on changes in the husk content, thus exhibiting poor adaptability. Therefore, this paper proposes a sunflower seed dehulling device with a secondary peeling function. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention proposes a sunflower seed shelling device with a secondary shelling function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sunflower seed shelling device with a secondary shelling function, comprising a sheller, an elevator, a boiling device, and a separating screen, wherein the elevator, sheller, and boiling device are connected in sequence, the separating screen is inclined and located below the boiling device, the separating screen is provided with a screen plate and a discharge port, the elevator is provided with a feed port located directly below the screen plate, a second separating mechanism is provided above the screen plate, and a first separating mechanism connected to the discharge port is provided above the feed port; The first separation mechanism includes a first gathering hopper. The first gathering hopper has an inlet adapted to the discharge port on the side near the second separation mechanism. The second gathering hopper is fixedly installed with a second pipe. The second separation mechanism includes a second gathering hopper. The top of the second gathering hopper is fixedly connected to the first pipe. The top of the first pipe is connected to the second pipe. A cyclone dust collector is provided on one side of the shelling device. The air inlet of the cyclone dust collector is fixedly connected to and communicates with the top of the second pipe. The first gathering hopper is equipped with multiple variable-pitch mechanisms arranged at equal intervals, all located below the inlet. These mechanisms are used to separate the sunflower seed husks and unhulled materials falling into the hopper by airflow turbulence, causing the sunflower seed husks to move upwards into the second pipe and the unhulled materials to fall downwards to the feed inlet. The second gathering hopper is fixedly equipped with a distribution plate located above the sieve plate. This plate spreads the sunflower seed husks and unhulled materials conveyed from the sieve plate into a thin layer, facilitating the negative pressure adsorption and peeling of the sunflower seed husks within the second gathering hopper.

[0006] Preferably, the second gathering hopper has a feed inlet on the side away from the first separating mechanism, and the second gathering hopper has a discharge outlet on the side closer to the first separating mechanism. The equalizing plate has a sinking part, a crest part, a trough part and an upward part, which are sequentially connected. The crest part is located inside the feed inlet.

[0007] Preferably, inclined plates are fixedly installed on both inner walls of the gathering hopper, multiple pitch-changing mechanisms are located between the two inclined plates, vertical plates are fixedly installed at the bottom of the two inclined plates, and blocking plates that are fixedly connected to the inner wall of the gathering hopper are fixedly installed on the side of the two vertical plates that are far apart from each other.

[0008] Preferably, the variable pitch mechanism includes a fixed rod, the two ends of which are fixedly connected to the inner walls of both sides of the collecting hopper, a V-shaped spring sheet is fixedly installed on the fixed rod, and inclined plates are fixedly installed on both sides of the V-shaped spring sheet, and vertical plates are fixedly installed at the bottom of the two inclined plates.

[0009] Preferably, the pitch-changing mechanism further includes two double-piston rod cylinders, which are located between two vertical plates on the pitch-changing mechanism. The ends of the two piston rods of the double-piston rod cylinders are respectively hinged to the two vertical plates. The cylinder barrels of the two double-piston rod cylinders are fixedly fitted with the same fixing plate. Both ends of the fixing plate are slidably fitted with positioning frames, and the two positioning frames are respectively fixedly connected to the inner walls of the two sides of the gathering hopper.

[0010] Preferably, the two vertical plates on the pitch mechanism are fixedly installed with the same rubber corrugated plate.

[0011] Preferably, the first pipe is provided with a damper, the second pipe is provided with a damper, and the first damper is located above the second damper.

[0012] Preferably, the separating screen is inclined, with its higher end connected to the outlet of the boiling device and its lower end adapted to the feed inlet.

[0013] Preferably, the bottom end of the first pipe is connected to the top of the second collecting hopper, and the bottom end of the second pipe is connected to the top of the first collecting hopper.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention achieves gradient negative pressure adsorption separation of screened materials by setting up a second separation mechanism and a first separation mechanism. The second separation mechanism uses a distributing plate to automatically spread the material conveyed from the screen into a thin layer. Combined with the negative pressure airflow in the second collection hopper, this efficiently removes most of the residual sunflower seed husks. The remaining material after the initial husk removal then enters the first separation mechanism, where it undergoes a second, deeper separation through direct negative pressure adsorption in the first collection hopper and the airflow turbulence of the variable-pitch mechanism. The two husk-removing structures work together to significantly reduce the husk content in the unhulled seeds returned to the elevator, preventing the accumulation of sunflower seed husks in the huller, thereby improving the efficiency of the cyclic hulling process and the stability of the equipment operation.

[0015] In this invention, the variable-pitch mechanism of the separation mechanism adopts a "narrow inlet - wide outlet" airflow channel design. The channel width between the vertical plates on adjacent variable-pitch mechanisms is smaller than the channel width between the inclined plates. This causes the upward airflow to accelerate between the vertical plates and decelerate between the inclined plates, creating a non-uniform force distribution where the lower layer thrust is greater than the upper layer thrust. This effectively promotes the tumbling motion of sunflower seed husks and unhulled seeds between the two inclined plates. This tumbling action can fully peel off and carry away the sunflower seed husks mixed between or attached to the surface of the unhulled seeds, solving the technical problem of difficult separation of bottom-layer materials in traditional single negative pressure adsorption methods and significantly improving the effect of secondary husk removal.

[0016] This invention also possesses flexible adjustment capabilities. By controlling the extension and retraction of the double piston rod cylinder in the pitch-changing mechanism, the distance between adjacent vertical plates 2 and the distance between the two side vertical plates 2 and the adjacent vertical plate 1 can be precisely adjusted. This changes the upward thrust of the airflow on the material, enabling active control of the material tumbling amplitude to adapt to the separation requirements of materials with different husk contents and moisture contents. Simultaneously, a damper 1 is installed on pipe 1, and a damper 2 is installed on pipe 2, allowing independent adjustment of the negative pressure adsorption intensity of separation mechanism 2 and separation mechanism 1, respectively. This multi-parameter adjustable design gives the equipment excellent material adaptability and process adjustability, significantly improving the overall efficiency and product purity of the sunflower seed dehulling production line. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a sunflower seed shelling device with a secondary peeling function proposed in this invention. Figure 2 This is a side view of a sunflower seed shelling device with a secondary peeling function proposed in this invention. Figure 3 This is a schematic diagram of the structure of the separating screen, cyclone dust collector, separation mechanism one, separation mechanism two, pipeline one and pipeline two in a sunflower seed shelling device with secondary peeling function proposed in this invention. Figure 4 This is a three-dimensional side sectional view of the separating screen, cyclone dust collector, separating mechanism one, separating mechanism two, pipe one and pipe two in a sunflower seed shelling device with secondary peeling function proposed in this invention. Figure 5 This is a side sectional view of the separation mechanism one in a sunflower seed shelling device with a secondary peeling function proposed in this invention; Figure 6 This is a side sectional view of the second separation mechanism in a sunflower seed shelling device with a secondary peeling function proposed in this invention; Figure 7 This is a side sectional view of the equalizing plate and the sieve plate in a sunflower seed shelling device with a secondary peeling function proposed in this invention. Figure 8 This is a side sectional view of a partial separation mechanism in a sunflower seed shelling device with a secondary peeling function proposed in this invention. Figure 9 This is a side sectional view of the variable distance mechanism in a sunflower seed shelling device with a secondary peeling function proposed in this invention.

[0018] In the diagram: 1. Dehuller; 2. Elevator; 3. Boiling water boiler; 4. Separating screen; 5. Cyclone dust collector; 6. Separation mechanism one; 7. Separation mechanism two; 8. Pipeline one; 9. Pipeline two; 21. Feed inlet; 41. Screen plate; 42. Discharge inlet; 81. Air damper one; 91. Air damper two; 61. Gathering hopper one; 62. Feed inlet; 63. Inclined plate one; 64. Vertical plate one; 65. Blocking plate; 66. Pitch-changing mechanism; 661. Fixed rod; 662. V-shaped spring; 663. Inclined plate two; 664. Vertical plate two; 665. Double piston rod cylinder; 666. Fixed plate; 667. Positioning frame; 668. Rubber corrugated plate; 71. Gathering hopper 2; 711. Feed inlet; 712. Discharge outlet; 72. Distributing plate; 721. Sinking section; 722. Crest section; 723. Trough section; 724. Lifting section. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The sunflower shelling machine in this embodiment is an upgraded product of the previous generation sunflower shell sorting machine of Bayannur Yongming Machinery Manufacturing Co., Ltd. The previous generation sunflower shell sorting machine has been granted an invention patent, with patent application number CN202510499377.4.

[0021] Please refer to Figures 1-9 The present invention provides a technical solution: a sunflower seed shelling device with a secondary shelling function, comprising a sheller 1, an elevator 2, a boiling water boiler 3 and a separating screen 4, wherein the elevator 2, the sheller 1 and the boiling water boiler 3 are connected in sequence, the separating screen 4 is inclined and located below the boiling water boiler 3, the separating screen 4 is provided with a screen plate 41 and a discharge port 42, the elevator 2 is provided with a feed port 21 located directly below the screen plate 41, a second separation mechanism 7 is provided above the screen plate 41, and a first separation mechanism 6 connected to the discharge port 42 is provided above the feed port 21. Separation mechanism 1 6 includes a collection hopper 1 61. The collection hopper 1 61 has an inlet 62 that is compatible with the discharge port 42 on the side near the separation mechanism 2 7. A pipe 2 9 is fixedly installed on the top of the collection hopper 1 61. Separation mechanism 2 7 includes a collection hopper 2 71. A pipe 1 8 is fixedly connected to the top of the collection hopper 2 71. The top end of the pipe 1 8 is connected to the pipe 2 9. A cyclone dust collector 5 is provided on one side of the sheller 1. The air inlet of the cyclone dust collector 5 is fixedly connected to and communicates with the top of the pipe 2 9. The first gathering hopper 61 is equipped with multiple variable-pitch mechanisms 66 arranged at equal intervals. All variable-pitch mechanisms 66 are located below the feed inlet 62. The variable-pitch mechanisms 66 are used to separate the sunflower seed husks and unhulled materials falling into the hopper by airflow turbulence, so that the sunflower seed husks move upward into the second pipe 9 and the unhulled materials fall downward to the feed inlet 21. The second gathering hopper 71 is fixedly installed with a distribution plate 72, which is located above the screen plate 41. The distribution plate 72 is used to spread the sunflower seed husks and unhulled materials conveyed from the screen plate 41 into a thin layer, so that the negative pressure adsorption in the second gathering hopper 71 can peel off the sunflower seed husks.

[0022] The sheller 1, elevator 2, boiling water 3, and separating screen 4 can be referenced from the previous generation product.

[0023] The second collection hopper 71 has a feed inlet 711 on the side away from the first separation mechanism 6, and a discharge outlet 712 on the side of the second collection hopper 71 closer to the first separation mechanism 6. The equalizing plate 72 has a sinking part 721, a crest part 722, a trough part 723 and an upward part 724. The sinking part 721, the crest part 722, the trough part 723 and the upward part 724 are connected in sequence, and the crest part 722 is located inside the feed inlet 711.

[0024] Furthermore, the separation mechanism 2 7 is located above the sieve plate 41, and its core components are the equalizing plate 72 and the agglomeration hopper 2 71. The agglomeration hopper 2 71 is connected to the pipe 2 9 through the pipe 1 8, and maintains a negative pressure state inside.

[0025] When the material on the sieve plate 41 [including sunflower seed husks and unhulled seeds] moves towards the feed inlet 42 in an inclined direction under the action of vibration, it first enters the collecting hopper 71 and comes into contact with the sinking part 721 of the equalizing plate 72. Due to the blocking effect of the equalizing plate 72, the material continuously accumulates on the right side of the sinking part 721. As the accumulation height gradually increases and exceeds the height of the crest part 722, the material automatically crosses the crest part 722 and moves along the trough part 723.

[0026] As the material moves from the crest 722 to the trough 723, the continuous curved surface structure of the equalizing plate 72, through the transition between the crest 722 and the trough 723, evenly spreads the originally accumulated material into a thin layer. This thin layer structure greatly increases the surface area of ​​sunflower seed husks exposed to the negative pressure airflow, improving adsorption efficiency. At this time, the negative pressure airflow inside the collecting hopper 2 71 adsorbs and carries away most of the lighter sunflower seed husks in this thin layer, which then enters the second pipe 9 through pipe 1 8 and finally flows into the cyclone dust collector 5.

[0027] The remaining unadsorbed material [containing a small amount of sunflower seed husks and unhulled seeds] falls into the trough section 723 and continues to move along the curved surface of the equalization plate 72 under inertia, and is thrown upwards through the lifting section 724. During the upward movement, the remaining sunflower seed husks are exposed to the negative pressure environment again and are further adsorbed and peeled off. Through the structural design of the sinking section 721, the crest section 722, the trough section 723 and the lifting section 724 being connected in sequence, the equalization plate 72 realizes the continuous processing of the material through "accumulation-spreading-adsorption-swinging and re-adsorption", which significantly improves the efficiency and effect of the initial husk removal.

[0028] Inclined plates 63 are fixedly installed on both inner walls of the gathering hopper 61. Multiple pitch-changing mechanisms 66 are located between the two inclined plates 63. Vertical plates 64 are fixedly installed at the bottom of the two inclined plates 63. Blocking plates 65 that are fixedly connected to the inner wall of the gathering hopper 61 are fixedly installed on the side of the two vertical plates 64 that are far apart from each other.

[0029] The variable pitch mechanism 66 includes a fixed rod 661. The two ends of the fixed rod 661 are fixedly connected to the inner walls of the two sides of the first collection hopper 61, respectively. A V-shaped spring piece 662 is fixedly installed on the fixed rod 661. An inclined plate 663 is fixedly installed on both sides of the V-shaped spring piece 662. A vertical plate 664 is fixedly installed at the bottom of the two inclined plates 663.

[0030] The pitch-changing mechanism 66 also includes two double piston rod cylinders 665. The double piston rod cylinders 665 are located between two vertical plates 664 on the pitch-changing mechanism 66, and the ends of the two piston rods of the double piston rod cylinders 665 are respectively hinged to the two vertical plates 664. The cylinder barrels of the two double piston rod cylinders 665 are fixedly fitted with the same fixing plate 666. Both ends of the fixing plate 666 are slidably fitted with positioning frames 667. The two positioning frames 667 are respectively fixedly connected to the inner walls of the two sides of the gathering hopper 61.

[0031] Furthermore, the remaining material after being processed by separation mechanism 2 7 [including some sunflower seed husks and unshelled seeds] enters collection hopper 1 61 through discharge port 42 and inlet port 62. Upon entering collection hopper 1 61, a portion of the extremely light and highly suspended sunflower seed husks is directly adsorbed by the negative pressure airflow within collection hopper 1 61 and enters pipe 2 9 through pipe 1 8, completing the initial secondary separation.

[0032] The remaining material that is not directly adsorbed falls into the channels between multiple pitch-changing mechanisms 66 and between the pitch-changing mechanisms 66 and the inclined plates 63 on both sides.

[0033] The width of the channel between the two adjacent vertical plates 664 on the two adjacent pitch-changing mechanisms 66 is smaller than the width of the channel between the two corresponding inclined plates 663, forming a "narrow inlet - wide outlet" airflow channel structure. When airflow moves from bottom to top, its path is as follows: The airflow first passes between the two narrow vertical plates 2664, and the airflow velocity increases significantly due to the sudden decrease in the cross-sectional area of ​​the channel; The airflow then enters the space between the two wider inclined plates 2663, and the airflow speed decreases rapidly due to the sudden increase in the cross-sectional area of ​​the channel; This change in flow velocity results in differences in the thrust experienced at different heights within the material channel: the lower layer of material [near the narrow opening] experiences a greater thrust from the airflow, while the upper layer experiences a smaller thrust. This uneven force between the upper and lower layers causes the sunflower seed husks and unhulled seeds between the two inclined plates to tumble and churn.

[0034] During the tumbling process, the lighter sunflower seed husks are thrown upwards and then carried into pipe 29 by the negative pressure airflow; while the heavier unhulled seeds overcome the airflow thrust due to gravity and fall downwards to the feed port 21, and then enter the elevator 2 to be sent back to the dehuller 1 for dehulling again.

[0035] Furthermore, to adapt to the separation requirements of materials with different peel contents, the following spacing can be precisely adjusted by controlling the extension and retraction of the double piston rod cylinder 665: The distance between two adjacent vertical plates 664 on two adjacent pitch-changing mechanisms 66; the distance between vertical plate 664 on the pitch-changing mechanisms 66 on both sides and the adjacent vertical plate 64.

[0036] When the double piston rod cylinder 665 extends, the aforementioned gap decreases, the acceleration effect of the airflow at the narrow opening becomes more significant, the upward thrust on the material increases, and the tumbling amplitude increases, making it suitable for materials with a high skin content; when the double piston rod cylinder 665 retracts, the gap increases, the airflow thrust decreases, and the tumbling amplitude decreases, making it suitable for materials with a low skin content.

[0037] A rubber corrugated plate 668 is fixedly installed between the two vertical plates 664 on the pitch mechanism 66.

[0038] Furthermore, the rubber corrugated plate 668 has good flexibility, which can maintain the sealing of the channel when the spacing between the two vertical plates 664 changes, prevent material from leaking from the side, and adapt to the frequent adjustment of the pitch mechanism 66.

[0039] Pipe 1 8 is equipped with damper 1 81, and pipe 2 9 is equipped with damper 2 91. Damper 1 81 is located above damper 2 91.

[0040] The separating screen 4 is set at an angle, with its higher end connected to the outlet of the boiling water boiler 3 and its lower end adapted to the discharge port 42.

[0041] The bottom end of pipe 8 is connected to the top of collection hopper 71, and the bottom end of pipe 9 is connected to the top of collection hopper 61.

[0042] In this embodiment: When the equipment of the present invention is working, the sunflower seeds to be shelled are first fed into the sheller 1 by the elevator 2 for mechanical shelling. The shelled mixture [including sunflower kernels, unshelled seeds and sunflower husks] enters the boiling water boiler 3. The boiling water boiler 3 uses airflow to perform the initial shell removal of the mixture, taking away most of the lighter sunflower husks. The remaining material falls onto the screen plate 41 of the inclined separation screen 4. Under the excitation action of the separation screen 4, the sunflower kernels and some unshelled seeds are screened out from the upper end of the screen plate 41 and enter the subsequent process, while the sunflower husks and another part of the unshelled seeds that remain on the upper surface of the screen plate 41 move towards the feed port 42 along the inclined direction and enter the separation mechanism 2 7 and separation mechanism 1 6 in sequence for secondary shell removal.

[0043] Separation mechanism 2 7 is located above screen plate 41. Its equalizing plate 72 spreads the conveyed material into a thin layer. The negative pressure in the aggregation hopper 2 71 adsorbs and carries away most of the sunflower seed husks in this thin layer; the remaining material enters aggregation hopper 1 61 through discharge port 42. Multiple variable-pitch mechanisms 66 are evenly spaced inside aggregation hopper 1 61. The channel width between the vertical plates 2 664 on adjacent variable-pitch mechanisms 66 is smaller than the channel width between the inclined plates 2 663. When the airflow flows from bottom to top, it accelerates between the vertical plates 2 664 and decelerates between the inclined plates 2 663, causing the lower layer of material to be subjected to greater force than the upper layer of material. This causes the sunflower seed husks and unshelled seeds to tumble. During the tumbling process, the lighter sunflower seed husks are carried upward into pipe 2 9, while the heavier unshelled seeds fall downward to discharge port 21. The distance between adjacent vertical plates 2 664 can be adjusted by the extension and retraction of the double piston rod cylinder 665, thereby controlling the tumbling amplitude to adapt to the separation requirements of different materials.

[0044] Unhulled seeds falling from the feed inlet 21 enter the elevator 2, which then sends them back to the dehuller 1 for further hulling, forming a closed-loop cycle until all material is hulled. The airflow carrying sunflower seed husks in pipe 1 8 and pipe 2 9 eventually converges into the cyclone dust collector 5. Under centrifugal force, the sunflower seed husks gather and settle at the bottom, requiring periodic cleaning. Pipe 1 8 is equipped with damper 81, and pipe 2 9 is equipped with damper 91. By independently adjusting the opening of dampers 81 and 91, the negative pressure adsorption intensity of separation mechanism 2 7 and separation mechanism 6 can be controlled respectively, adapting to the processing needs of materials with different husk contents.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sunflower seed shelling device with a secondary shelling function, comprising a sheller (1), an elevator (2), a boiler (3), and a separating screen (4), wherein the elevator (2), the sheller (1), and the boiler (3) are connected in sequence, the separating screen (4) is inclined and located below the boiler (3), the separating screen (4) is provided with a screen plate (41) and a discharge port (42), and the elevator (2) is provided with a feed port (21) located directly below the screen plate (41), characterized in that: The screen plate (41) is provided with a separation mechanism two (7) above it, and the feed port (21) is provided with a separation mechanism one (6) connected to the feed port (42). The separation mechanism one (6) includes a collection hopper one (61), and the collection hopper one (61) has an inlet (62) adapted to the discharge port (42) on the side near the separation mechanism two (7). The top of the collection hopper one (61) is fixedly installed with a pipe two (9). The separation mechanism two (7) includes a collection hopper two (71), and the top of the collection hopper two (71) is fixedly connected to a pipe one (8). The top of the pipe one (8) is connected to the pipe two (9). The sheller (1) is provided with a cyclone dust collector (5) on one side. The air inlet of the cyclone dust collector (5) is fixedly connected to and communicates with the top of the pipe two (9). The first gathering hopper (61) is equipped with multiple variable-pitch mechanisms (66) arranged at equal intervals. The multiple variable-pitch mechanisms (66) are all located below the feed inlet (62). The variable-pitch mechanisms (66) are used to separate the sunflower seed husks and unhulled materials that fall into the hopper by airflow tumbling, so that the sunflower seed husks move upward into the second pipe (9) and the unhulled materials fall downward to the feed inlet (21). The second gathering hopper (71) is fixedly installed with a distribution plate (72) on its inner wall. The distribution plate (72) is located above the sieve plate (41). The distribution plate (72) is used to spread the sunflower seed husks and unhulled materials conveyed from the sieve plate (41) into a thin layer so that the negative pressure in the second gathering hopper (71) can adsorb and peel off the sunflower seed husks. The second gathering hopper (71) has a feed inlet (711) on the side away from the first separation mechanism (6), and a discharge outlet (712) on the side of the second gathering hopper (71) close to the first separation mechanism (6). The equalizing plate (72) has a sinking part (721), a crest part (722), a trough part (723) and an upward part (724). The sinking part (721), the crest part (722), the trough part (723) and the upward part (724) are connected in sequence. The crest part (722) is located inside the feed inlet (711).

2. The sunflower seed shelling device with a secondary shelling function according to claim 1, characterized in that: Inclined plates (63) are fixedly installed on both inner walls of the gathering hopper (61). Multiple pitch-changing mechanisms (66) are located between the two inclined plates (63). Vertical plates (64) are fixedly installed at the bottom of the two inclined plates (63). Blocking plates (65) that are fixedly connected to the inner wall of the gathering hopper (61) are fixedly installed on the side of the two vertical plates (64) that are far apart from each other.

3. The sunflower seed shelling device with a secondary shelling function according to claim 1, characterized in that: The variable pitch mechanism (66) includes a fixed rod (661), the two ends of which are fixedly connected to the inner walls of the two sides of the first gathering hopper (61). A V-shaped spring piece (662) is fixedly installed on the fixed rod (661), and two inclined plates (663) are fixedly installed on both sides of the V-shaped spring piece (662). A vertical plate (664) is fixedly installed at the bottom of each of the two inclined plates (663).

4. A sunflower seed shelling device with a secondary shelling function according to claim 3, characterized in that: The pitch-changing mechanism (66) further includes two double piston rod cylinders (665). The double piston rod cylinders (665) are located between two vertical plates (664) on the pitch-changing mechanism (66). The ends of the two piston rods of the double piston rod cylinders (665) are respectively hinged to the two vertical plates (664). The cylinder barrels of the two double piston rod cylinders (665) are fixedly fitted with the same fixing plate (666). The two ends of the fixing plate (666) are slidably fitted with positioning frames (667). The two positioning frames (667) are respectively fixedly connected to the inner walls of the two sides of the gathering hopper (61).

5. A sunflower seed shelling device with a secondary shelling function according to claim 3, characterized in that: The same rubber corrugated plate (668) is fixedly installed between the two vertical plates (664) on the pitch mechanism (66).

6. The sunflower seed shelling device with a secondary shelling function according to claim 1, characterized in that: The first pipe (8) is provided with a damper (81), and the second pipe (9) is provided with a damper (91). The damper (81) is located above the damper (91).

7. A sunflower seed shelling device with a secondary shelling function according to claim 1, characterized in that: The separating screen (4) is set at an angle, with its higher end connected to the outlet of the boiling device (3) and its lower end adapted to the discharge port (42).

8. A sunflower seed shelling device with a secondary shelling function according to claim 1, characterized in that: The bottom end of the first pipe (8) is connected to the top of the second collection hopper (71), and the bottom end of the second pipe (9) is connected to the top of the first collection hopper (61).

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