Method and device for taking seeds from watermelons

Abstract

This invention provides a method and apparatus for extracting watermelon seeds, relating to the field of agricultural technology. The watermelon seed extraction apparatus includes a peeling box, a first conveyor belt assembly, a first centrifuge, a second conveyor belt assembly, a second centrifuge, a third conveyor belt assembly, and a fourth conveyor belt assembly. In this invention, the watermelon is enveloped by two sets of relatively rotating segments within the peeling box, causing the watermelon to rotate randomly. During this rotation, the watermelon continuously contacts the inner wall of the segments, allowing the peel to be quickly removed by the peeling blade. This avoids the problem of watermelon peel mixing in and being difficult to separate during the subsequent seed extraction process. The peeled pulp is then cut by a cutting blade during transport and further centrifuged and pressed by the first centrifuge, avoiding the presence of large pieces of pulp and greatly improving the separation efficiency of the second centrifuge. The pulp, juice, and seeds are thoroughly separated, resulting in excellent separation performance.

Description

Technical Field

[0001] This invention relates to the field of agricultural technology, specifically to a method and apparatus for extracting watermelon seeds. Background Technology

[0002] Watermelon is one of the most popular fruits in summer. A large supply of watermelons requires a large supply of watermelon seeds. This is especially true for watermelon farmers who grow watermelons for their seeds. Currently, in the early stages of watermelon seed production, seeds were mainly obtained manually by extracting them from the flesh, or by rinsing the flesh with water before extraction. Both methods were time-consuming and labor-intensive. To address this, publicly available technologies have proposed improvements, specifically a watermelon seed extractor. This machine includes a watermelon crushing mechanism, a frame mechanism, and a separation mechanism. The crushing mechanism is located above the frame mechanism, and the separation mechanism is located between the upper and lower plates of the frame mechanism. The crushing mechanism comprises a shielding box, a rotary motor, crushing blades, a scraper, and a hydraulic cylinder. The shielding box's sidewalls are connected to the rotary motor and the hydraulic cylinder. The crushing blades extend horizontally within the shielding box and are connected to the rotary motor's output shaft via bearings. A scraper is connected to the bottom of the shielding box, and the scraper is connected to the hydraulic cylinder's movable plug. This improved technology claims to increase watermelon crushing efficiency, prevent splashing during crushing, protect personnel, and prevent waste. However, this improved technology fails to consider that the watermelon rind and seeds are difficult to separate after crushing. Further crushing of the rind will inevitably damage the seeds, resulting in poor practical application of this improved technology.

[0003] For example, there is a watermelon seed extractor on the market that prevents fruit from sticking together. This includes a watermelon seed extractor body, which comprises a mixing tank. A feed pipe is fixedly connected to one side of the mixing tank, and a seed outlet pipe is fixedly connected to the other side. The seed outlet pipe has an internal solenoid valve. The bottom of the mixing tank has a liquid outlet and is funnel-shaped. This watermelon seed extractor, through its crushing components, first uses a servo motor to drive a rotating shaft and crushing blades to chop the watermelon pulp. Simultaneously, the drive wheel on the crushing shaft drives the driven wheel to rotate, causing the threaded rod to rotate. The first through hole on the extrusion plate is threadedly connected to the threaded rod, causing the extrusion plate to move up and down, further compressing the chopped pulp into a juicy form. Then, a filter screen is used to filter out large watermelon seeds. It can be seen that this watermelon seed extractor is essentially the same as the aforementioned improved technology; both crush the watermelon with the peel on before extracting the seeds, thus failing to avoid the problem of the peel and seeds not being completely separated.

[0004] Based on the above-mentioned realities, this invention develops a labor-saving and time-saving watermelon seed extraction method and supporting device. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a watermelon seed extraction method and apparatus, which solves the problems of time-consuming and labor-intensive manual seed extraction and the inability of existing seed extraction equipment to separate watermelon rind and seeds.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a watermelon seed extraction device, comprising a peeling box, a first conveyor belt assembly, a first centrifuge, a second conveyor belt assembly, a second centrifuge, a third conveyor belt assembly, and a fourth conveyor belt assembly. The lower end of the peeling box is supported by feet. A feeding gate for convenient feeding is rotatably connected to the left wall of the peeling box. Peeling devices for peeling are installed on the peeling box via two sets of fixed frames. Openings are provided on the front and right walls of the peeling box. A watermelon peel discharge guide plate is fixedly connected to the inner side of the opening on the front wall of the peeling box, and a lower receiving guide plate is fixedly connected to the inner side of the opening on the right wall of the peeling box. The inner sidewall of the lower receiving guide plate is slidably connected to the upper receiving guide plate via a telescopic drive structure. The first conveyor belt assembly is located between the end of the lower receiving guide plate away from the peeling box and the first centrifuge. The second conveyor belt assembly is located between the first centrifuge and the second centrifuge. The third conveyor belt assembly is located between the second centrifuge and the fourth conveyor belt assembly. The first conveyor belt assembly is provided with a cutting structure for cutting the peeled pulp. The upper wall of the third conveyor belt assembly is fixedly connected to a dryer for drying. A blowing structure for air screening of melon seeds is provided between the third conveyor belt assembly and the fourth conveyor belt assembly.

[0009] Preferably, the peeling device includes two sets of petals, two sets of fixed frames are respectively fixedly connected to the front wall and rear wall of the peeling box, two sets of guide rails are fixedly connected to the upper wall of the fixed frame, a slider is slidably connected between the two sets of guide rails, a baffle is fixedly connected to the end of the two sets of guide rails away from the peeling box, a first cylinder is fixedly connected to the side of the baffle away from the peeling box, the extension shaft of the first cylinder passes through the baffle and is slidably connected to it, the end of the extension shaft of the first cylinder is fixedly connected to the slider, a motor is fixedly connected to the upper wall of the slider, the end of the extension shaft of the motor is fixedly connected to a rotating shaft through a coupling, sliding seats are fixedly connected to the front wall and rear wall of the peeling box, the ends of the two sets of rotating shafts away from the motor pass through the two sets of sliding seats and extend into the interior of the peeling box, the two sets of petals are respectively fixedly connected to the ends of the two sets of rotating shafts that extend into the interior of the peeling box, the side wall of the petal is provided with multiple sets of watermelon peel discharge holes that are interconnected inside and outside, and a peeling knife is fixedly connected to one of the two inner side walls along the length direction of the multiple sets of watermelon peel discharge holes.

[0010] Preferably, the telescopic drive structure includes a push block and a second cylinder. The push block is fixedly connected to the lower wall of the upper receiving guide plate. The lower wall of the lower receiving guide plate is provided with an elongated hole that runs vertically through the upper and lower parts. The end of the push block away from the upper receiving guide plate passes through the elongated hole and extends to the lower side of the lower receiving guide plate. The second cylinder is fixedly connected to the lower wall of the lower receiving guide plate through a fixed seat and is located at the end of the lower receiving guide plate away from the peeling box. The end of the extension shaft of the second cylinder is fixedly connected to the push block.

[0011] Preferably, both the first centrifuge and the second centrifuge are inclined horizontal centrifuges. Both centrifuges consist of a frame, an outer cylinder, an inner cylinder, and a drive device for rotating the inner cylinder. The inner cylinder of the first centrifuge includes a first inlet, a first cavity, and a first outlet. The end of the first conveyor belt assembly away from the peeling box is connected to the first inlet. The inner cylinder of the second centrifuge includes a second inlet, a second cavity, and a second outlet. The inner diameter of the first cavity is larger than the first inlet and the first outlet, and the inner diameter of the second cavity is larger than the second inlet and the second outlet. The inner wall of the first cavity is provided with multiple sets of scrapers that are screwed to the inner wall of the first cavity by elastic plates. The blades of the multiple sets of scrapers face away from the rotation direction of the first centrifuge. There are six or more scrapers, and they are all evenly distributed in a circle with the axis of the first cavity as the center. The second cavity is provided with a filter screen for filtering fruit pulp. A vibrator is provided on the filter screen. A slag discharge port for the fruit pulp to flow out is provided at the bottom of the second cavity. The second conveyor belt assembly is located between the first outlet and the second inlet.

[0012] Preferably, the slitting structure includes a crossbeam, multiple sets of blade holders, and multiple sets of slitting blades. A set of vertical plates is fixedly connected to the upper wall of the first conveyor belt assembly near the left and right sides. The crossbeam is fixedly connected to the upper wall of the two sets of vertical plates. The multiple sets of blade holders are distributed at equal intervals on the left and right sides and are threadedly connected to the lower wall of the crossbeam, all located between the two sets of vertical plates. The multiple sets of slitting blades are rotatably connected to the lower wall of the multiple sets of blade holders. The blade holders and slitting blades are kept vertical by torsion springs.

[0013] Preferably, the outer wall of the transmission belt of the first conveyor belt assembly is provided with multiple sets of stops distributed along its circumference, and the inner wall of each set of stops is provided with a slit for the slitting blade to pass through.

[0014] Preferably, the blowing structure includes a blower, an air collecting hood, and a waste guide plate. The blower is fixedly connected to the front wall of the fourth conveyor belt assembly and located below the third conveyor belt assembly. The air collecting hood is fixedly connected to the rear wall of the blower. The rear wall of the air collecting hood is provided with an air outlet that runs through the inside and outside. The waste guide plate is fixedly connected to the upper wall of the fourth conveyor belt assembly and located near the rear wall. The waste guide plate and the air outlet are aligned front to back.

[0015] A watermelon seed extraction method, using any of the above-mentioned watermelon seed extraction devices, includes the following steps:

[0016] S1. Peeling: Open the feed door and feed the watermelon into the peeling box using the fork. Control the extension shafts of the two sets of first cylinders to extend, thereby driving the two sets of segments to wrap the watermelon inside. When the two sets of segments are about to merge, pull out the fork, close the feed door, and start the two sets of motors to rotate. The watermelon is peeled by multiple sets of peeling blades on the inner side wall of the segment. The peeled watermelon skin is discharged through the peel discharge hole to the outer wall of the segment and falls onto the peel discharge guide plate for discharge.

[0017] S2. Pressing: After the watermelon is peeled to form pulp, the motor is turned off, the second cylinder extension shaft extends, driving the upper receiving guide plate into the peeling box and positioned below the two sets of segments. The two sets of first cylinder extension shafts are controlled to retract, thereby causing the two sets of segments to separate. The pulp falls onto the upper receiving guide plate and rolls onto the conveyor belt of the first conveyor belt assembly for transport. During the transport process, the pulp is cut into multiple segments by multiple cutting blades. The cut pulp is transported to the first centrifuge through the first conveyor belt assembly. When the first centrifuge has transported a sufficient amount of pulp, the drive device of the first centrifuge is started. The centrifugal force and multiple scrapers on the inner wall of the first chamber are used to press the pulp into a pulpy pulp with seeds.

[0018] S3. Separation: The pulpy fruit containing melon seeds is discharged through the first outlet to the top of the second conveyor belt assembly, and then transported to the second centrifuge through the second conveyor belt assembly. The drive device of the second centrifuge is driven by centrifugal force, which, together with the filter screen with vibrator in the second centrifuge, separates the melon seeds and pulp. The pulp and juice are thrown out from the filter screen holes and discharged through the slag discharge port. The separated melon seeds are discharged through the second outlet to the third conveyor belt assembly.

[0019] S4. Drying: The separated melon seeds are conveyed to the next process via the third conveyor belt assembly. When passing through the dryer, the surface of the melon seeds is dried.

[0020] S5. Screening: The dried melon seeds are conveyed by the third conveyor belt assembly and thrown from the end of the third conveyor belt assembly onto the fourth conveyor belt assembly. During the throwing process, the blower blows away the residual pulp and lighter melon seeds. The screened melon seeds are then sent out by the fourth conveyor belt assembly.

[0021] S6. Calculate the white seed residue rate. If it is not up to standard, increase the blower speed in step S5 until it is up to standard.

[0022] Preferably, in step S1, the two sets of valves do not contact each other after they come together and rotate in opposite directions.

[0023] Preferably, the first centrifuge in step S2 and the second centrifuge in step S3 rotate in opposite directions.

[0024] (III) Beneficial Effects

[0025] This invention provides a method and apparatus for watermelon seed extraction. It has the following beneficial effects:

[0026] 1. Compared with existing technologies, this watermelon seed extraction method and device uses two sets of relatively rotating segments in a peeling box to wrap the watermelon, causing the watermelon to rotate randomly. During the rotation, the watermelon continuously contacts the inner wall of the segments, and the peel is quickly removed by the peeling knife, avoiding the problem of watermelon peel getting mixed in and difficult to separate during the subsequent seed extraction process.

[0027] 2. Compared with existing technologies, this watermelon seed extraction method and device, after peeling, the pulp is cut by a cutting blade during transportation, and then centrifuged and pressed by the first centrifuge, which avoids the presence of large pieces of pulp and greatly improves the separation efficiency of the second centrifuge. The pulp, juice and seeds are thoroughly separated, and the separation effect is good. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 This is a partial schematic diagram of the side structure of the peeling box of the present invention;

[0031] Figure 4 This is a schematic diagram of the valve structure of the present invention;

[0032] Figure 5 This is a schematic cross-sectional view of the connection structure between the lower and upper support guide plates of the present invention.

[0033] Figure 6 This is a side view of the connection structure between the blower and the air collector hood of the present invention.

[0034] The components are as follows: 1. Base; 2. Peeling box; 3. Feed gate; 4. Fixing frame; 5. Guide rail; 6. Slider; 7. Baffle; 8. First cylinder; 9. Motor; 10. Coupling; 11. Rotating shaft; 12. Sliding seat; 13. Petal body; 14. Peel discharge hole; 15. Peeling knife; 16. Peel discharge guide plate; 17. Lower receiving guide plate; 18. Upper receiving guide plate; 19. First conveyor belt assembly; 20. Stop block. 21. Vertical plate; 22. Horizontal beam; 23. Knife holder; 24. Slitting knife; 25. First centrifuge; 26. Second conveyor belt assembly; 27. Second centrifuge; 28. Third conveyor belt assembly; 29. ​​Dryer; 30. Blower; 31. Fourth conveyor belt assembly; 32. Waste guide plate; 33. Long hole; 34. Push block; 35. Fixed seat; 36. Second cylinder; 37. Air collector hood; 38. Air outlet. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example:

[0036] like Figures 1 to 6 As shown, this embodiment of the invention provides a watermelon seed extraction device, including a peeling box 2, a first conveyor belt assembly 19, a first centrifuge 25, a second conveyor belt assembly 26, a second centrifuge 27, a third conveyor belt assembly 28, and a fourth conveyor belt assembly 31. In this device, the peeling box 2 peels the watermelon, and the first centrifuge 25 presses the peeled watermelon into a pulp without large pieces of flesh. The pulp is then separated from the seeds, flesh, and juice by the second centrifuge 27. The separated seeds are dried and screened by air to obtain the finished product. Compared with traditional technology, the absence of watermelon rind during the pressing process results in better pulp pressing and the absence of large, difficult-to-break pieces. It also ensures the effectiveness of the separation process by the second centrifuge 27.

[0037] Both the first centrifuge 25 and the second centrifuge 27 are horizontally inclined centrifuges. Each centrifuge consists of a frame, an outer cylinder, an inner cylinder, and a drive device for rotating the inner cylinder. The inner cylinder of the first centrifuge 25 includes a first inlet, a first cavity, and a first outlet. The end of the first conveyor belt assembly 19 furthest from the peeling box 2 is connected to the first inlet. The inner cylinder of the second centrifuge 27 includes a second inlet, a second cavity, and a second outlet. The inner diameter of the first cavity is larger than the first inlet and the first outlet, and the inner diameter of the second cavity is larger than the second inlet and the second outlet. Multiple sets of scrapers are provided on the inner wall of the first cavity, secured to the inner wall by elastic plates. The blades of the multiple sets of scrapers face away from the first centrifuge 27. 5. Rotation direction, the number of scrapers is six or more and they are evenly distributed in a circle with the axis of the first chamber as the center. The second chamber is equipped with a filter screen for filtering the pulp, and a vibrator is installed on the filter screen. The bottom of the second chamber is equipped with a slag outlet for the pulp to flow out. The second conveyor belt assembly 26 is located between the first outlet and the second inlet. The horizontal centrifuge is a mature technology on the market. It is set in an inclined position, which is mentioned in many publicly available technologies. The purpose is to improve centrifugation efficiency. After peeling, the watermelon pulp is cut by the cutting blade 24 and sent to the first centrifuge 25. The pulp is squeezed into a pulp by multiple sets of scrapers on the inner wall of the first chamber in combination with centrifugal force, and then sent to the second centrifuge 27 for separation of juice, pulp and seeds.

[0038] The lower end of the peeling box 2 is supported by a base 1. A feed gate 3 for easy feeding is rotatably connected to the left wall of the peeling box 2. A peeling device for peeling is mounted on the peeling box 2 via two sets of fixed brackets 4. The peeling device includes two sets of flaps 13. The two sets of fixed brackets 4 are respectively fixedly connected to the front and rear walls of the peeling box 2. Two sets of guide rails 5 are fixedly connected to the upper wall of the fixed brackets 4. A slider 6 is slidably connected between the two sets of guide rails 5. A baffle 7 is fixedly connected to the end of the two sets of guide rails 5 away from the peeling box 2. A first cylinder 8 is fixedly connected to the side of the baffle 7 away from the peeling box 2. The extension shaft of the first cylinder 8 passes through the baffle 7 and is slidably connected to it. The end of the extension shaft of the first cylinder 8 is fixedly connected to the slider 6. A motor 9 is fixedly connected to the upper wall of the slider 6. The end of the extension shaft of the motor 9 is fixedly connected to a rotating shaft 11 via a coupling 10. Sliding seats 12 are fixedly connected to both the front and rear walls of the peeling box 2. The two sets of rotating shafts 1... One end away from the motor 9 passes through two sets of sliding seats 12 and extends into the peeling box 2. Two sets of petal bodies 13 are fixedly connected to the ends of two sets of rotating shafts 11 that extend into the peeling box 2. The side wall of the petal body 13 is provided with multiple sets of watermelon peel outlet holes 14 that are open inside and out. One of the inner side walls of the two sets of watermelon peel outlet holes 14 along the length direction is fixedly connected to a peeling knife 15. A common fork is inserted into the watermelon and sent between the two sets of petal bodies 13. By controlling the extension shaft of the first cylinder 8 to extend, the two sets of petal bodies 13 are driven to move closer together. After the two sets of petal bodies 13 cover the watermelon, the fork can be pulled out. The two sets of petal bodies 13 are driven by the two sets of motors 9 to rotate in opposite directions, thereby causing the watermelon to rotate randomly. During the rotation, the peeling knife 15 quickly peels the watermelon, and the watermelon peel is discharged through the watermelon peel outlet hole 14. After peeling, the petal body 13 is opened to let the pulp fall out.

[0039] The peeling box 2 has openings on both the front and right walls. A fruit peel discharge guide plate 16 is fixedly connected to the inner side of the opening on the front wall of the peeling box 2. After the fruit peel is discharged through the fruit peel discharge hole 14, it falls into the fruit peel discharge guide plate 16 and is discharged by its own weight and the inclination of the fruit peel discharge guide plate 16.

[0040] A lower receiving guide plate 17 is fixedly connected to the inner side wall of the opening on the right side of the peeling box 2. An upper receiving guide plate 18 is slidably connected to the inner side wall of the lower receiving guide plate 17 via a telescopic drive structure. A first conveyor belt assembly 19 is located between the end of the lower receiving guide plate 17 away from the peeling box 2 and the first centrifuge 25. The telescopic drive structure includes a push block 34 and a second cylinder 36. The push block 34 is fixedly connected to the lower wall of the upper receiving guide plate 18. The lower wall of the lower receiving guide plate 17 is provided with an elongated hole 33 that runs vertically through the upper and lower sides. The end of the push block 34 away from the upper receiving guide plate 18 passes through the elongated hole 33 and extends to the lower receiving guide plate 18. On the lower side of the guide plate 17, the second cylinder 36 is fixedly connected to the lower wall of the lower receiving guide plate 17 via the fixed seat 35 and is located at the end of the lower receiving guide plate 17 away from the peeling box 2. The end of the extension shaft of the second cylinder 36 is fixedly connected to the push block 34. During the peeling process, the upper receiving guide plate 18 is in a retracted state. After peeling is completed and before the petals 13 open, the second cylinder 36 extends through the extension shaft, driving the upper receiving guide plate 18 to move below the two sets of petals 13, catching the falling pulp, and rolling onto the first conveyor belt assembly 19 via the upper receiving guide plate 18 and the lower receiving guide plate 17.

[0041] The second conveyor belt assembly 26 is located between the first centrifuge 25 and the second centrifuge 27, and the third conveyor belt assembly 28 is located between the second centrifuge 27 and the fourth conveyor belt assembly 31. The first conveyor belt assembly 19 is equipped with a cutting structure for cutting the peeled pulp. The cutting structure includes a crossbeam 22, multiple sets of blade holders 23, and multiple sets of cutting blades 24. A set of vertical plates 21 are fixedly connected to the upper wall of the first conveyor belt assembly 19 near the left and right sides, respectively. The crossbeam 22 is fixedly connected to the upper wall of the two sets of vertical plates 21. The multiple sets of blade holders 23 are distributed at equal intervals on the left and right sides and are threadedly connected to the lower wall of the crossbeam 22. Between the two sets of vertical plates 21, multiple sets of cutting blades 24 are rotatably connected to the lower wall of multiple sets of blade holders 23. The blade holders 23 and the cutting blades 24 are kept vertical by torsion springs. The outer wall of the transmission belt of the first conveyor belt assembly 19 is provided with multiple sets of blocks 20 distributed along its circumference. The inner wall of each set of blocks 20 is provided with a slit for the cutting blades 24 to pass through. During the transportation of the peeled melon pulp, when it passes through the multiple sets of cutting blades 24, it is pushed by the blocks 20 toward the cutting blades 24 and then cut into multiple segments by the cutting blades 24. The cut melon pulp can greatly reduce the pressing time of the first centrifuge 25 and improve the overall working efficiency.

[0042] A dryer 29 for drying is fixedly connected to the upper wall of the third conveyor assembly 28, and the separated melon seeds are dried by the dryer 29.

[0043] A blowing structure for screening melon seeds is provided between the third conveyor belt assembly 28 and the fourth conveyor belt assembly 31. The blowing structure includes a blower 30, an air collecting hood 37, and a waste guide plate 32. The blower 30 is fixedly connected to the front wall of the fourth conveyor belt assembly 31 and located below the third conveyor belt assembly 28. The air collecting hood 37 is fixedly connected to the rear wall of the blower 30. The rear wall of the air collecting hood 37 is provided with an air outlet 38 that runs through the inside and outside. The waste guide plate 32 is fixedly connected to the upper wall of the fourth conveyor belt assembly 31 and located near the rear wall. The waste guide plate 32 and the air outlet 38 are aligned front and back. When the dried melon seeds fall from the third conveyor belt assembly 28 to the fourth conveyor belt assembly 31, they are screened by the blower 30. The remaining pulp fibers and unripe melon seeds are blown away and discharged after being collected by the waste guide plate 32. The qualified melon seeds fall onto the fourth conveyor belt assembly 31 and are sent out.

[0044] The watermelon seed collection method involves using the aforementioned watermelon seed collection device and includes the following steps:

[0045] S1. Peeling: Open the feed door 3 and feed the watermelon into the peeling box 2 using the fork. Control the extension shafts of the two sets of first cylinders 8 to extend, thereby driving the two sets of segments 13 to wrap the watermelon inside. When the two sets of segments 13 are about to merge, pull out the fork, close the feed door 3, and start the two sets of motors 9 to rotate. The watermelon is peeled by multiple sets of peeling blades 15 on the inner side wall of the segment 13. The peeled watermelon skin is discharged through the watermelon skin discharge hole 14 to the outer wall of the segment 13 and falls onto the watermelon skin discharge guide plate 16 for discharge.

[0046] S2. After the watermelon is peeled and the pulp is formed, the motor 9 is turned off, the second cylinder 36 extends its shaft, and drives the upper receiving guide plate 18 to extend into the peeling box 2 and be positioned below the two sets of segments 13. The two sets of first cylinders 8 retract their shafts, thereby causing the two sets of segments 13 to separate. The pulp falls onto the upper receiving guide plate 18 and rolls onto the conveyor belt of the first conveyor belt assembly 19 through the upper receiving guide plate 18 and the lower receiving guide plate 17 for conveying. During the conveying process, the pulp is cut into multiple segments by multiple cutting blades 24. The cut pulp is conveyed to the first centrifuge 25 through the first conveyor belt assembly 19. When the first centrifuge 25 has transported a sufficient amount of pulp, the drive device of the first centrifuge 25 is started. The pulp is pressed into a pulpy pulp with seeds by centrifugal force and multiple scrapers on the inner wall of the first chamber.

[0047] S3. Separation: The pulpy fruit containing melon seeds is discharged through the first outlet to the top of the second conveyor belt assembly 26, and then transported through the second conveyor belt assembly 26 to the second centrifuge 27. The drive device of the second centrifuge 27 drives the centrifuge 27, and the centrifugal force, together with the filter screen with vibrator in the second centrifuge 27, separates the melon seeds and pulp. The pulp and juice are thrown out from the filter screen holes and discharged through the slag discharge port. The separated melon seeds are discharged through the second outlet to the third conveyor belt assembly 28.

[0048] S4. Drying: The separated melon seeds are conveyed to the next process via the third conveyor belt assembly 28. When passing through the dryer 29, the surface of the melon seeds is dried by the dryer 29.

[0049] S5. Screening: The dried melon seeds are conveyed by the third conveyor belt assembly 28 and thrown from the end of the third conveyor belt assembly 28 onto the fourth conveyor belt assembly 31. During the throwing process, the blower 30 blows away the residual pulp and lighter melon seeds. The screened melon seeds are then sent out by the fourth conveyor belt assembly 31.

[0050] S6. Calculate the white seed residue rate. If it is not up to standard, increase the wind speed of the blower in step S5 to 30 until it is up to standard.

[0051] In step S1, the two sets of valves 13 approach each other without contacting each other and rotate in opposite directions.

[0052] The first centrifuge 25 in step S2 and the second centrifuge 27 in step S3 rotate in opposite directions.

[0053] Working principle: In this device, a commonly used fork is inserted into the watermelon and placed between two sets of segments 13. The extension shaft of the first cylinder 8 extends, causing the two sets of segments 13 to move closer together. Once the two sets of segments 13 have enveloped the watermelon, the fork can be removed. The two sets of segments 13 are then driven by two motors 9 to rotate in opposite directions, causing the watermelon to rotate randomly. During this rotation, the peeler 15 quickly peels the watermelon, and the rind is discharged through the rind outlet hole 14. After peeling, the segments 13 are opened, allowing the pulp to fall. The rind, after being discharged through the rind outlet hole 14, falls into the rind discharge guide plate 16 and is discharged by its own weight and the slope of the rind discharge guide plate 16. During the peeling process, the upper receiving guide plate 18 is in a retracted state. After peeling, before the segments 13 are opened, the extension shaft of the second cylinder 36 extends, moving the upper receiving guide plate 18 below the two sets of segments 13 to catch the falling pulp. 18. The lower receiving guide plate 17 rolls onto the first conveyor belt assembly 19. During the transport of the peeled watermelon pulp, as it passes through the multi-section cutting blades 24, it is pushed by the stop block 20 toward the cutting blades 24, and then cut into multiple segments by the cutting blades 24. The segmented watermelon pulp can greatly reduce the pressing time of the first centrifuge 25, which can improve the overall working efficiency. After being segmented by the cutting blades 24, the peeled watermelon pulp is sent into the first centrifuge 25, passing through the multi-section cutting blades on the inner wall of the first cavity. The scraper, in conjunction with centrifugal force, squeezes the pulp into a slurry, which is then fed into the second centrifuge 27 to separate the juice, pulp, and seeds. The separated seeds are dried by the dryer 29. When the dried seeds fall from the third conveyor belt assembly 28 to the fourth conveyor belt assembly 31, they are filtered by the blower 30. The remaining pulp fibers and unripe seeds are blown away and discharged after being collected by the waste guide plate 32. The qualified seeds fall onto the fourth conveyor belt assembly 31 and are sent out.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A watermelon seed extraction device, characterized in that: The system includes a peeling box (2), a first conveyor belt assembly (19), a first centrifuge (25), a second conveyor belt assembly (26), a second centrifuge (27), a third conveyor belt assembly (28), and a fourth conveyor belt assembly (31). The lower end of the peeling box (2) is supported by a foot (1). The left wall of the peeling box (2) is rotatably connected to a feed gate (3) for convenient feeding. The peeling box (2) is equipped with a peeling device for peeling by two sets of fixed frames (4). The front wall and right wall of the peeling box (2) are provided with openings. The inner side wall of the opening on the front wall of the peeling box (2) is fixedly connected to a peel discharge guide plate (16). The inner side wall of the opening on the right wall of the peeling box (2) is fixedly connected to a lower receiving guide plate (17). The inner side wall of the lower receiving guide plate (17) is telescopically connected to the lower receiving guide plate (17). The drive structure is slidably connected to an upper support guide plate (18). The first conveyor belt assembly (19) is located between the lower support guide plate (17) away from the peeling box (2) and the first centrifuge (25). The second conveyor belt assembly (26) is located between the first centrifuge (25) and the second centrifuge (27). The third conveyor belt assembly (28) is located between the second centrifuge (27) and the fourth conveyor belt assembly (31). The first conveyor belt assembly (19) is provided with a cutting structure for cutting the peeled pulp. The upper wall of the third conveyor belt assembly (28) is fixedly connected to a dryer (29) for drying. A blowing structure for blowing and screening melon seeds is provided between the third conveyor belt assembly (28) and the fourth conveyor belt assembly (31). The peeling device includes two sets of flaps (13). Two sets of fixed brackets (4) are fixedly connected to the front and rear walls of the peeling box (2), respectively. Two sets of guide rails (5) are fixedly connected to the upper wall of the fixed brackets (4). A slider (6) is slidably connected between the two sets of guide rails (5). A baffle (7) is fixedly connected to one end of the two sets of guide rails (5) away from the peeling box (2). A first cylinder (8) is fixedly connected to the side of the baffle (7) away from the peeling box (2). The extension shaft of the first cylinder (8) passes through the baffle (7) and is slidably connected thereto. The end of the extension shaft of the first cylinder (8) is fixedly connected to the slider (6). A motor (9) is fixedly connected to the upper wall of the slider (6). The end of the extension shaft of the motor (9) is connected to the coupling (10). A rotating shaft (11) is fixedly connected to the peeling box (2). Sliding seats (12) are fixedly connected to the front and rear walls of the peeling box (2). The ends of the two rotating shafts (11) away from the motor (9) pass through the two sliding seats (12) and extend into the peeling box (2). The two sets of petal bodies (13) are fixedly connected to the ends of the two rotating shafts (11) that extend into the peeling box (2). The side wall of the petal body (13) is provided with multiple sets of watermelon peel outlet holes (14) that are connected inside and outside. One of the inner side walls of the multiple sets of watermelon peel outlet holes (14) in the length direction is fixedly connected to a peeling knife (15). The peeling knife (15) rotates synchronously with the petal body (13) and discharges the peeled watermelon peel outward through the watermelon peel outlet hole (14). The slitting structure includes a crossbeam (22), multiple sets of blade holders (23), and multiple sets of slitting blades (24). A set of vertical plates (21) is fixedly connected to the upper wall of the first conveyor belt assembly (19) near both the left and right sides. The crossbeam (22) is fixedly connected to the upper walls of the two sets of vertical plates (21). The multiple sets of blade holders (23) are distributed at equal intervals on the left and right sides and sequentially threaded to the lower wall of the crossbeam (22), all located between the two sets of vertical plates (21). The multiple sets of slitting blades (24)... The cutter (24) is rotatably connected to the lower wall of multiple sets of cutter holders (23), and the cutter holder (23) and the cutter (24) are kept vertical by torsion springs; the outer wall of the transmission belt of the first conveyor belt assembly (19) is provided with multiple sets of stops (20) distributed along its circumference, and the inner wall of each set of stops (20) is provided with a slit for the cutter (24) to pass through. The cutter (24) passes through the slit to limit and cut the pulp between adjacent stops (20); The first centrifuge (25) and the second centrifuge (27) are both inclined centrifuges. The first centrifuge (25) and the second centrifuge (27) are both composed of a frame, an outer cylinder, an inner cylinder and a drive device for driving the inner cylinder to rotate. The inner cylinder of the first centrifuge (25) includes a first inlet, a first cavity and a first outlet. The inner diameter of the first cavity and the second cavity is larger than their respective inlet and outlet. The inner side wall of the first cavity is provided with multiple sets of scrapers. The blades of the scrapers face away from the direction of rotation and are evenly distributed in a circle. The second cavity is provided with a filter screen for filtering fruit pulp.

2. The watermelon seed extraction device according to claim 1, characterized in that: The telescopic drive structure includes a push block (34) and a second cylinder (36). The push block (34) is fixedly connected to the lower wall of the upper receiving guide plate (18). The lower wall of the lower receiving guide plate (17) is provided with an elongated hole (33) that runs vertically through the upper and lower sides. The end of the push block (34) away from the upper receiving guide plate (18) passes through the elongated hole (33) and extends to the lower side of the lower receiving guide plate (17). The second cylinder (36) is fixedly connected to the lower wall of the lower receiving guide plate (17) through a fixing seat (35) and is located at the end of the lower receiving guide plate (17) away from the peeling box (2). The end of the extension shaft of the second cylinder (36) is fixedly connected to the push block (34).

3. A method for extracting watermelon seeds, using any one of the watermelon seed extraction devices according to claims 1 to 2, characterized in that: The seed extraction method includes the following steps: S1, peeling: The watermelon is fed into the peeling box (2) by a fork, and two sets of segments (13) wrap the watermelon inside. The motor (9) drives the segments (13) to rotate, and the peeling knife (15) fixed to the inner wall of the peel outlet hole (14) peels the watermelon. The peeled watermelon is guided by the peeling knife (15) and rotates with the segments, and is discharged from the outer wall of the segments through the peel outlet hole (14); S2, pressing: The watermelon pulp falls onto the first conveyor belt assembly (19) for conveying. During the conveying process, the slitting knife (2) inserted into the slit of the stop block (20) presses the pulp. 4) The pulp between adjacent blocks (20) is cut and the pulp is cut into a pulpy pulp with seeds. The pulp is then pressed into a pulpy pulp with seeds by a scraper. S3, Separation: The pulpy pulp with seeds is put into a second centrifuge (27). The seeds and pulp are separated by centrifugal force and a filter with a vibrator. The separated seeds are put into the third conveyor belt assembly (28). S4, Drying and Screening: After the seeds are dried by the dryer (29), they are thrown to the fourth conveyor belt assembly (31). The blower (30) blows away the residual pulp. The screened seeds are then sent out.

4. The watermelon seed extraction method according to claim 3, characterized in that: In step S1, the two sets of valves (13) come together but do not touch and rotate in opposite directions.

5. The watermelon seed extraction method according to claim 3, characterized in that: The first centrifuge (25) in step S2 and the second centrifuge (27) in step S3 rotate in opposite directions.

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