Pulse jet assisted precision on-membrane seeding device based on CFD-EDM and design method

Abstract

This invention proposes a CFD-EDM-based pulse jet-assisted precision seeding device and design method for film-based seeding. It includes a hole-making device and a seed metering device arranged side-by-side. The hole-making device comprises a base plate, a motor fixed to the base plate via a bracket, a crank fixedly connected to the motor, and a first connecting rod hinged to the crank. It also includes a second, third, and fourth connecting rod, with a guide rod connected to the end of the fourth connecting rod. A drill bit is fixedly connected to the guide rod. The seed metering device includes a housing, a seed metering wheel, and a blocking wheel. The seed metering wheel is rotatably connected to the housing and one side is flush with the inner wall of the housing. The seed metering wheel has several perforations. A seeding port is opened at the bottom of the housing, and a cycloidal guide rail and a jet pump are provided at the seeding port. This invention comprehensively considers the collaborative working mode of the hole-making device and the seed metering device. Through simulation optimization design, it can significantly improve the seeding success rate of small and medium-sized seeds, resulting in stable seed filling and uniform seeding.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery design technology, and in particular to a pulse jet-assisted precision seeding device for film based on CFD-EDM and its design method. Background Technology

[0002] In modern agricultural production, efficient and precise sowing technology has a decisive impact on the quality and yield of crops. In greenhouse agriculture, small and medium-sized seeds are mainly sown manually, resulting in uneven planting density and requiring tedious manual thinning after germination, leading to high labor intensity, poor sowing uniformity, and low seed survival rates. Because small-sized seeds are small, light, and easily damaged, pneumatic seed meters are widely used for precision sowing of small and medium-sized seeds. However, pneumatic seed meters and their associated equipment are complex in structure and bulky, making them unsuitable for greenhouse agriculture.

[0003] Chinese invention patent CN117918089A, entitled "A Precision Seeder for Small-Particle Seeds," discloses a precision seeder for small-particle seeds. It includes a cleaning and seeding box with a cover plate detachably connected to its bottom. The box also includes a water storage chamber filled with water for seed sorting. A rotating shaft is rotatably connected to the cover plate. This technical solution utilizes the buoyancy of the water in the storage chamber to sort the seeds, allowing shriveled seeds and impurities to float upwards, thus separating plump seeds and improving seed survival rate. Furthermore, the continuous spraying of water from nozzles increases the seed's falling speed as it exits the seed tube, embedding the seeds into the soil and providing a covering effect, further improving survival rate. However, this technical solution only considers the seeding method of the seeder and neglects the hole-making function of the seed-making device, thus failing to address issues of unstable seed filling and uneven seed distribution.

[0004] Chinese Invention Patent: Publication No. CN117016114A, entitled "A Seed Meter and Method Based on Air Pressure Detection and Airflow Disturbance Correction," discloses a seed metering device and method based on air pressure detection and airflow disturbance correction. The device includes an air chamber shell, a sowing shell, a seed box, a seed metering shaft, a seed suction plate, an air pressure detection device, and an airflow disturbance correction device. The seed suction plate has multiple suction holes for adsorbing seeds. The air pressure detection device detects the air pressure data at the suction holes to identify whether the holes are properly adsorbing seeds. The airflow disturbance correction device agitates abnormally adsorbed seeds with air, promoting normal seed adsorption within the suction holes. This technical solution can detect the air pressure at the suction holes to identify whether they are properly adsorbing seeds. When abnormal seed adsorption is detected, positive pressure airflow disturbs the seeds in the suction holes, promoting normal seed adsorption and correcting the seed adsorption state. This ensures that each suction hole can better adsorb one seed, thereby improving sowing accuracy. However, this technical solution uses negative pressure adsorption for each seed during sowing, which may damage small and medium-sized seeds and increase energy consumption, resulting in waste. In addition, this technical solution only considers the sowing method of the seeder, but does not consider the hole-making function of the hole-making device, thus failing to solve the problems of unstable seed filling and uneven seed distribution. Summary of the Invention

[0005] To address the problems of unstable seed filling, uneven seed dispensing, and damage to small- and medium-sized seeds caused by negative pressure adsorption in existing technologies, this invention proposes a CFD-EDM-based pulse jet-assisted precision seeding device and design method for film-based seeding. This invention features a simple structure, convenient assembly and disassembly, and the ability to sow seeds of different sizes by changing the seed dispensing wheel, demonstrating good versatility.

[0006] This invention is achieved through the following technical solution: It includes a hole-making device and a seed metering device arranged side-by-side, the hole-making device and the seed metering device being fixed to a mobile device. The hole-making device includes a vertically arranged base plate fixedly connected to the mobile device, a horizontally arranged motor fixed to the base plate by a bracket, a crank fixedly connected to the output end of the motor, and a first connecting rod hinged to the crank. It also includes a second connecting rod, a third connecting rod, and a fourth connecting rod, the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod being connected end-to-end in sequence. The end of the fourth connecting rod is connected to a guide rod; the other end of the guide rod is fixedly connected to a drill bit by a thread. The seed metering device includes an outer shell composed of two vertically stacked square boxes, a seed metering wheel passing through a circular opening in the middle of the lower box of the outer shell and mounted inside the outer shell, and a blocking wheel extending into the seed metering wheel. The two square boxes of the outer shell... The vertical centerlines of the box-shaped housing do not coincide, and the upper part of the housing is offset away from the hole-making device. The seed-dispensing wheel is rotatably connected to the outer shell, and the circumferential surface of the seed-dispensing wheel near the hole-making device is in contact with the inner wall of the outer shell. The seed-dispensing wheel is a cylindrical shell with one end open. Several pits are arranged in an array along the circumferential direction on the circumferential surface of the seed-dispensing wheel. A connecting shaft is provided at the center of the seed-dispensing wheel shaft, which is connected to the rotating component on the moving device. The blocking wheel extends into the inside of the seed-dispensing wheel from one end of the seed-dispensing wheel opening, and the outer wall of the blocking wheel is in contact with the inner wall of the seed-dispensing wheel. A sowing port is provided at the center of the bottom of the outer shell, and a cycloidal guide rail is provided at the sowing port. One end of the cycloidal guide rail is located at the sowing port at the bottom of the outer shell, and the other end is horizontally facing the hole-making device. An air pump is also provided at the sowing port at the bottom of the outer shell. The air pump includes an air nozzle, which faces the cycloidal guide rail from top to bottom.

[0007] Furthermore, a limiter is also fitted on the guide rod, which is fixedly connected to the base plate. A baffle is also provided near the position where the guide rod connects to the drill bit. The baffle is cylindrical and parallel to the guide rod.

[0008] Furthermore, a flow guide plate is provided between the seed metering wheel and the seeding port at the bottom of the outer shell.

[0009] Furthermore, the blocking wheel is provided with a notch in the circumference, and a seed dispensing brush is provided at the notch. The seed dispensing brush faces the seed dispensing wheel and is perpendicular to the circumference of the seed dispensing wheel.

[0010] Furthermore, the notch of the blocking wheel occupies one-quarter of the complete circumference of the blocking wheel, and the seed-dispensing brush is arranged vertically.

[0011] Furthermore, the seeding wheel is fitted with a left slider and a right slider connected to the outer casing via a groove on the side away from the seeding device.

[0012] Furthermore, the upper side of the outer casing is inclined toward the seed metering wheel on the side away from the seed-making device, and a discharge plate is provided at the inclined position of the outer casing.

[0013] Furthermore, a seed cleaning brush is vertically arranged inside the upper side box of the outer shell. The seed cleaning brush is fixedly connected to the outer shell and faces the seed metering wheel. The seed cleaning brush is in contact with the circumferential surface of the seed metering wheel.

[0014] The present invention also provides a design method applicable to the CFD-EDM-based pulse jet-assisted precision seeding device on film described in this invention, comprising the following steps:

[0015] Step 1: Based on the major axis dimension L0 of small and medium-sized seeds, obtain the outer diameter D and inner diameter D1 of the seed metering reel, in mm, using the following formula:

[0016]

[0017] Step 2: Based on the major axis dimension L0, minor axis dimension W0, and thickness H0 of small and medium-sized seeds, use the formula... The sphericity S of small and medium-sized seeds was obtained. p If the spherical degree S p If the percentage is greater than or equal to 50%, a dome-shaped cylindrical eyelet should be used; otherwise, an irregularly shaped eyelet should be used.

[0018] Step 3: Based on the specific seed type and planting process, determine the number of eye holes per row.

[0019] Step 4: Based on the major axis dimension L0, minor axis dimension W0, thickness H0 of small and medium-sized seeds, and the orientation constraints of small and medium-sized seeds in the pit, obtain the initial diameter d and initial depth y range of the pit, as shown in the following formula:

[0020]

[0021]

[0022] In the formula, k a k is the length correction factor. b k is the width correction factor. c This is the thickness correction factor;

[0023] Step 5: Preliminarily select the inward angle γ of the eye socket;

[0024] Step 6: Based on the major axis dimension L0 of small and medium-sized seeds, the depth y of the seed well, and the coefficient of friction μ between small and medium-sized seeds and the seed well wall, the depth of the seed guide groove and the preliminary range of the inclination angle θ are obtained by using the formula cotθ>μ.

[0025] Step 7: Based on the outer diameter D of the seed metering reel, the diameter d of the seedholes, the spacing d1 of the seedholes in each row, the arc length l of the seed filling zone I, and the angle α occupied by the seed filling zone I, the number of rows of seedholes is obtained, using the following formula:

[0026]

[0027] Step 8: Based on the forward speed V of the unit, the plant spacing x, and the number of rows of seed holes z, obtain the rotational speed of the seed metering reel, using the following formula:

[0028]

[0029] Step 9: According to the cycloid equation The cycloidal guide rail model is established with the center of the seeding port at the bottom of the shell as the origin of the coordinate axis; the straight line passing through the origin and perpendicular to the axis of the guide rod is the X-axis, and the positive direction of the X-axis is the ray direction from the origin to the axis; the straight line passing through the origin and parallel to the axis of the guide rail is the Y-axis.

[0030] Step 10: Based on the diameter d at the bottom of the seed pile s Aerodynamic viscosity μ a , conveying airflow density ρ a and seed density ρ s The drag coefficient partitioning determination value k is obtained. a According to k a Query the drag coefficient partition table and retrieve the corresponding shape correction coefficient K. x Substituting into the formula, we obtain the theoretical levitation velocity v. x According to the theoretical levitation velocity v x The wind speed v is obtained. xmax Air pump flow rate V a And according to wind speed v xmax Air pump flow rate V a Select the appropriate jet pump; the formula is as follows:

[0031]

[0032] Step 11: Build a seed metering device model in Solidworks software using all the dimensional parameters obtained in Steps 1 to 10. Establish multiple simulation models using the depth y of the eyelet, the diameter d of the eyelet, the inward angle γ of the eyelet, the inclination angle θ of the seed guide groove, and the rotational speed n of the seed metering wheel as adjustment variables. Convert the models to STL format and import them into EDEM. Select the eyelet depth y, eyelet diameter d, eyelet inclination angle γ, seed guide groove inclination angle θ, and seed metering wheel rotational speed n from the simulation model with the highest pass rate as the parameters of the final seed metering device.

[0033] Furthermore, in step four, the length correction coefficient k a The value range is 1-2, and the width correction factor k b The value range is 1-2, and the thickness correction factor k c The value range is 1.5-3.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. The present invention has a simple structure, is easy to disassemble and assemble, and can achieve sowing of seeds of different particle sizes by changing the seed metering wheel, and has good versatility.

[0036] 2. Based on the triaxial dimensions of small and medium-sized seeds, and combined with SW and EDEM software, this invention optimizes the design of each part of the seed metering device, solving the problems of unstable seed filling and uneven seed distribution in traditional mechanical seed metering devices.

[0037] 3. This invention adds a cycloidal guide rail and a pulse jet assist device to the seed discharge port. When the hole-making device completes the drilling, the seeds fall into the entrance of the cycloidal guide rail at the same time. With the assistance of the jet, they quickly fall into the hole. The time difference between the two is very short, realizing precision hole sowing of small-diameter seeds.

[0038] 4. This invention comprehensively considers the collaborative working mode of the seed-making device and the seed metering device. Through simulation optimization design, it can significantly improve the seeding success rate of small and medium-sized seeds, resulting in stable seed filling and uniform seeding. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0040] Figure 2 This is an exploded view of the various parts of the seed metering device of the present invention.

[0041] Figure 3 This is a top view of the seed metering part of the present invention.

[0042] Figure 4 for Figure 3 AA section diagram.

[0043] Figure 5 for Figure 4 Schematic diagram of the jet seeding structure.

[0044] Figure 6 This is an exploded view of the seeding wheel and blocking wheel in this invention.

[0045] Figure 7 This is a partially enlarged schematic diagram of the cylindrical eyelet in this invention.

[0046] Figure 8 for Figure 7 BB cross-sectional view.

[0047] Figure 9 This is a magnified schematic diagram of the eye socket with an added inner angle in this invention.

[0048] Figure 10 for Figure 9Cross-sectional view of DD.

[0049] Figure 11 This is a partially enlarged schematic diagram of the eye hole in this invention, which incorporates an inward-facing angle and a seed-guiding groove.

[0050] Figure 12 for Figure 11 The cross-sectional diagram of the medium-sized EE also includes a schematic diagram of small- and medium-sized seeds.

[0051] Figure 13 This is a schematic diagram of a seed in a vertical position inside the seedhole.

[0052] Figure 14 This is a schematic diagram of two seeds in a vertical position inside the seed burr.

[0053] Figure 15 This is a diagram showing a seed lying flat inside the seedhole.

[0054] Figure 16 This is a schematic diagram of two seeds lying flat inside the seed burial hole.

[0055] Figure 17 This is a diagram showing a seed lying on its side inside the seedhole.

[0056] Figure 18 This is a schematic diagram of two seeds in the seed burial hole while the seed is lying on its side.

[0057] The image shows:

[0058] 1. Air pump; 2. Left slider; 3. Right slider; 4. Unloading plate; 5. Cycloidal guide rail; 6. Seed metering wheel; 7. Outer shell; 8. Diverter plate; 9. Blocking wheel; 10. Seed metering brush; 11. Seed cleaning brush; 12. Motor; 13. Bracket; 14. Base plate; 15. Crank; 16. First connecting rod; 17. Second connecting rod; 18. Third connecting rod; 19. Fourth connecting rod; 20. Guide rod; 21. Limiter; 22. Drill bit; 23. Baffle; 101. Air nozzle; 102. Seed; 601. Seed hole; 603. Seed guide groove. Detailed Implementation

[0059] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

[0060] like Figure 1 and Figure 2As shown, this invention provides a CFD-EDM-based pulse jet-assisted precision seeding device for film, including a seed-making device and a seed metering device. The seed metering device and the seed-making device are arranged side by side and fixedly connected to a moving device. The seed-making device includes a motor 12, a support 13, a base plate 14, a crank 15, a first connecting rod 16, a second connecting rod 17, a third connecting rod 18, a fourth connecting rod 19, a guide rod 20, a limiter 21, a drill bit 22, and a baffle 23. The base plate 14 is vertically arranged to support the entire seed-making device and to mount the seed-making device to the moving device. The support 13 is arranged parallel to the base plate 14 to support the motor 12. The motor 12 is horizontally arranged, and the crank 15 is fixedly connected to the output end of the motor 12. The crank 15 is also hinged to the first connecting rod 16. The first connecting rod 16, the second connecting rod 17, the third connecting rod 18, and the fourth connecting rod 19 are connected end to end in sequence. A guide rod 20 is connected to the end of the fourth connecting rod 19. A limiter 21 is sleeved on the guide rod 20 and fixedly connected to the base plate 14. The limiter 21 serves as a guide, allowing the guide rod 20 to move linearly along the direction of the limiter 21. The limiter 21 has a stroke of 5mm to prevent damage to the device or the farmland. A drill bit 22 is threadedly fixed to the other end of the guide rod 20. Preferably, a conical drill bit is used because it produces a large hole with approximately uniform hole sizes and is less likely to damage the mulch film. A baffle 23 is also provided near the connection between the guide rod 20 and the drill bit 22. The baffle 23 is cylindrical and parallel to the guide rod 20 to ensure that seeds fall into the holes and prevent them from flying around. When the machine advances one plant spacing, the hole-making device moves downward at high speed to open the hole for sowing and instantly resets, realizing a direct-insertion reciprocating motion, effectively avoiding the occurrence of film tearing, film picking, and misalignment between the hole and the film hole. The crank 15, the first connecting rod 16, the second connecting rod 17, the third connecting rod 18, the fourth connecting rod 19, and the guide rod 20 form a crank-slider mechanism. The motor 12 drives the crank 15 to perform circular motion, which in turn causes the guide rod 20 to perform linear reciprocating motion within the limiter 21.

[0061] The seed metering device includes an air pump 1, a left slider 2, a right slider 3, a discharge plate 4, a cycloidal guide rail 5, a seed metering wheel 6, a housing 7, a guide plate 8, a blocking wheel 9, a seed metering brush 10, and a seed cleaning brush 11. The housing 7 is composed of two vertically stacked square boxes, whose vertical centerlines do not coincide. The upper box is offset away from the hole-making device. The housing 7 can also be integrally formed. A circular opening is provided through the lower part of the housing 7, perpendicular to both sides of the hole-making device. The seed metering wheel 6 passes through the circular opening on the housing 7 and is rotatably connected to it. The seed metering wheel 6 is a cylindrical shell with one open end, and several perforated holes 601 are provided through its circumference. Figure 2 , Figure 6 andFigure 10 As shown, the seed-metering wheel 6 has several rows of eye holes 601 arranged along its circumference, with the number of holes in each row determined according to the sowing requirements of the specific seed type. A connecting shaft is provided at the center of the seed-metering wheel 6, and this connecting shaft is connected to a rotating component on the moving device. The connecting shaft transmits the power from the rotating component on the moving device, thereby driving the seed-metering wheel 6 to rotate. The blocking wheel 9 extends into the seed-metering wheel 6 from one end of its opening, and its outer wall fits against the inner wall of the seed-metering wheel 6. The blocking wheel 9 is used to prevent seeds falling into the eye holes of the seed-metering wheel 6 from falling prematurely before reaching the sowing position. The blocking wheel 9 has a notch circumferentially arranged, and a seed-metering brush 10 is provided at the notch. The seed-metering brush 10 faces the seed-metering wheel 6 and is perpendicular to its circumference. Figure 4 , Figure 5 and Figure 6 As shown. The notch of the blocking wheel 9 preferably occupies one-quarter of the complete circumference of the blocking wheel 9. The seed-dispensing brush 10 is preferably vertically positioned, meaning that one of the starting or ending positions where the inner wall of the seed-dispensing wheel 6 and the outer wall of the blocking wheel 9 are in contact is vertical. The circumferential surface of the seed-dispensing wheel 6 near the hole-making device is in contact with the inner side of the outer shell 7. A seeding port is provided at the center of the bottom of the outer shell 7. One end of the cycloidal guide rail 5 is located at the seeding port at the bottom of the outer shell 7, and the other end faces horizontally towards the hole-making device. An air pump 1 is also provided at the seeding port at the bottom of the outer shell 7. The air pump 1 includes an air nozzle 101, which faces the cycloidal guide rail 5 from top to bottom. Figure 4 and Figure 5 As shown. Figure 3 and Figure 4 As shown, the left slider 2 and right slider 3 are disposed inside the outer casing 7 and connected to the outer casing 7 via a sliding groove. The left slider 2 and right slider 3 are disposed on the side of the seed metering wheel 6 away from the hole-making device and are in contact with the seed metering wheel 6, ensuring that the other side of the seed metering wheel 6 is always in contact with the inner side of the outer casing 7. The upper box of the outer casing 7 is inclined towards the seed metering wheel 6 on the side away from the hole-making device, and a discharge plate 4 is provided at the inclined position of the outer casing 7. A seed cleaning brush 11 is also vertically disposed inside the upper box of the outer casing 7. The seed cleaning brush 11 is fixedly connected to the outer casing 7 and faces the seed metering wheel 6. The seed cleaning brush 11 is in contact with the circumferential surface of the seed metering wheel 6. A guide plate 8 is also provided between the seed metering wheel 6 and the seeding port at the bottom of the outer casing 7. The guide plate 8 is used to guide the small and medium-sized seeds metered by the seed metering wheel 6 to the seeding port at the bottom of the outer casing 7.

[0062] like Figure 4 and Figure 5As shown, the upper box of the outer shell 7, the seed metering wheel 6, and the unloading plate 8 are combined to form the seed filling zone I. The seed cleaning zone II is formed from the seed cleaning brush 11 to the part of the lower box of the outer shell 7 that is not in contact with the seed metering wheel 6. The seed protection zone III is formed from the part of the lower box of the outer shell 7 that is in contact with the seed metering wheel 6. The seed metering zone IV is formed from the seed metering brush 10 to the unloading plate 8. The seed meterer enters from small and medium-sized seeds 102 and passes through the seed filling zone I, the seed cleaning zone II, the seed protection zone III, and the seed metering zone IV in sequence, thereby sowing the seeds onto the cultivated land. Before operation, seeds 102 are piled up in seed filling zone I and awaiting completion. During operation, the rotating component drives the seed metering wheel 6 to rotate via the drive shaft. When the seed hole 601 rotates to seed filling zone I, seeds 102 are encased in the seed hole 601 under the combined force of gravity and population action, completing the seed filling process. When the seed hole 601 rotates to seed cleaning zone II, the seed cleaning brush 11 removes excess seeds 102 from inside and outside the seed hole 601. After the seed hole 601 enters seed protection zone III, the seeds 102 remain inside the seed hole 601 under the protection of the blocking wheel 9 and the outer shell 7. Finally, when rotating to seed metering zone IV, seeds 102 slide out of the seed hole 601 under their own weight and the combined action of the seed metering brush 10, pass through the guide plate 8, and enter the cycloidal guide rail 5. With the assistance of the jet pump 1, the seeds 102 pass through the cycloidal guide rail 5 and finally fall into the seed hole, completing the entire sowing process.

[0063] Most parts in this invention are manufactured using 3D printing, making it quick and easy to remake any damaged parts. Assembly between parts is simple, and replacement and maintenance are convenient.

[0064] This invention also provides a design method for a CFD-EDM-based pulse jet-assisted precision seeding device for film, comprising the following steps:

[0065] Step 1: Based on the major axis dimension L0 of small and medium-sized seeds, obtain the outer diameter D and inner diameter D1 of the seed metering reel 6, in mm, using the following formula:

[0066]

[0067] The seed metering wheel 6 is the core component of the seed metering device. The size of the seed metering wheel 6 is a crucial factor affecting the seed metering effect, and its dimensions determine the structural dimensions of other components. To study the influence of the diameter of the seed metering wheel 6 on the seed filling time T, a system of equations was established relating the seed filling time T to the sowing operation parameters and the structural parameters of the seed metering wheel 6, namely:

[0068]

[0069] In the formula: T is the seed filling time (s), θ is the angle of the seed filling zone (°), ω is the angular velocity of the seed metering reel 6 (rad / s), n is the rotational speed of the seed metering reel 6 (r / min), z is the number of seed holes, and s is the plant spacing (cm). Rearranging the equations, we get:

[0070]

[0071] As shown in the above formula, the seed filling time is independent of the diameter of the seed metering wheel 6. Referring to the "Agricultural Machinery Design Handbook," the diameter of the seed metering wheel 6 in a seed metering device is generally selected within the range of 80–260 mm.

[0072] When seed 102 reaches the seed metering position, it cannot fall due to its own weight. Therefore, a forced seed metering device is set up to solve the problem of uneven seed metering. Now, a certain space needs to be hollowed out inside the seed metering wheel 6. It is necessary to ensure that the entire seed filling and seed protection process is not affected after the inside of the seed metering wheel is hollowed out. The remaining radial distance ΔD along the seed metering wheel 6 after hollowing out must be greater than or equal to 80% of the seed's long axis L0.

[0073] Step 2: Based on the major axis dimension L0, minor axis dimension W0, and thickness H0 of small and medium-sized seeds, use the formula... The sphericity S of small and medium-sized seeds was obtained. p If the spherical degree S p If the percentage is greater than or equal to 50%, use the dome-shaped cylindrical eyelet 601; otherwise, use the irregularly shaped eyelet 601. Figure 7 and Figure 8 As shown.

[0074] Step 3: Based on the specific seed type and planting process, determine the number of eye holes 601 per row.

[0075] The arrangement of seeds 102 within the eyelets 601 varies, with multiple seeds per hole. This can cause the seeds 102 to crowd each other within the eyelets 601, easily clogging them and hindering seed dispensing. Therefore, this invention employs a single-seed, multi-hole planting method. Based on the specific seed type's hole-sowing planting process in agricultural handbooks, the number of seeds sown per hole is determined. The number of eyelets 601 per row represents the lower limit for the number of seeds sown per hole, ensuring the sowing requirements are met.

[0076] Step 4: Based on the major axis dimension L0, minor axis dimension W0, thickness H0 of small and medium-sized seeds, and the orientation constraints of small and medium-sized seeds in the eyelet 601, the preliminary diameter d and preliminary depth y range of the eyelet 601 are obtained, as follows:

[0077]

[0078] In the formula, k a This is a length correction factor, ranging from 1 to 2; k b This is a width correction factor, ranging from 1 to 2; k c This is a thickness correction factor, ranging from 1.5 to 3.

[0079] like Figures 13 to 18To account for the possible postures of small- to medium-sized seeds within the eyelet 601, and to ensure that each eyelet 601 contains exactly one small- to medium-sized seed, this invention optimizes the design for three states of small- to medium-sized seeds within the eyelet 601: vertical, horizontal, and lateral. The diameter d and depth y of the eyelet 601 must satisfy the following conditions:

[0080] In a vertical orientation, the depth y of the seed eye 601 must be greater than the long axis of the seed, and the diameter d must be greater than the short axis and thickness of the seed. However, double seeding must be prevented in the long and short axis directions. Therefore, a correction factor is needed to prevent double seeding. The formula is as follows:

[0081]

[0082] When the seed is lying flat, the diameter d of the eye 601 must be larger than the long axis and short axis of the seed, and the depth y must be greater than the thickness of the seed. However, double sowing must be avoided in the thickness direction of the seed. Therefore, a correction factor is used to prevent double sowing. The formula is as follows:

[0083]

[0084] When the seed is in a lateral position, the diameter d of the eye 601 must be greater than the long axis and thickness of the seed, and the depth y must be greater than the short axis. However, double sowing must be avoided in the short axis and thickness directions of the seed. Therefore, a correction factor is used to prevent double sowing. The formula is as follows:

[0085]

[0086] The major axis dimension L0, minor axis dimension W0, thickness H0, and length correction factor k of small and medium-sized seeds are used to determine the major axis dimension L0, minor axis dimension W0, thickness H0, and length correction factor k. a Width correction factor k b and thickness correction factor k c Substituting these values ​​into the above formula, we obtain the preliminary diameter d and the preliminary depth y range of the eye opening 601.

[0087] Step 5: Preliminarily select the inner angle of the eye socket 601.

[0088] like Figure 9 and Figure 10 As shown, the seed metering effect is a direct reflection of the seed meterer's performance. If the portion of the seed hole 601 near the outer shell 7 is cylindrical, the seeds 102 are easily stuck inside the seed hole 601 during the seed metering process and are difficult to fall out. To solve this problem, the seed hole 601 is recessed by a certain angle γ. When the recessed angle γ is too large, it will cause the volume of the seed hole 601 to decrease, affecting seed filling. Therefore, the initial set recessed angle γ is between 0 and 45 degrees.

[0089] The inward angle γ is the angle between the generatrix L1 of the cylindrical portion of the eye hole 601 near the outer shell 7 when there is no inward angle and the generatrix L2 of the conical portion of the eye hole 601 near the outer shell 7 when there is an inward angle. The point of the eye hole 601 on the circumference of the seed metering wheel 6 remains unchanged before and after the inward angle is present.

[0090] Choosing the center of mass of a single seed 102 within the seed well 601 as coordinate point O, an XOY coordinate system is established along the tangential and normal directions of the seed metering reel 6. Force analysis is performed on this state: seed 102 experiences its own weight G, the supporting force N from the wall of the seed well 601, and the frictional force f from the wall of the seed well 601. To ensure seed 102 falls, the net force in the negative Y-axis direction must be greater than 0, i.e.:

[0091]

[0092] In the formula: μ is the coefficient of friction between seed 102 and the wall of the eye pore 601. Simplifying the above formula, we get G > 2μN. Substituting the inward angle γ, we get... Simplifying the above formula, we get G > 2N(μcosγ - sinγ). Analysis of the calculation results shows that after increasing the inward angle, the resistance experienced by seed 102 decreases, and the larger the inward angle γ, the more favorable it is for seed release. However, if the inward angle is too large, it will reduce the volume of the seedhole 601, thus leading to a decrease in seed filling capacity.

[0093] Step 6: Based on the major axis dimension L0 of small and medium-sized seeds, the depth y of the seed well 601, and the coefficient of friction μ between the small and medium-sized seeds and the wall of the seed well 601, the depth of the seed guide groove 603 and the preliminary range of the inclination angle θ are obtained by using the formula cotθ>μ.

[0094] like Figure 11 and Figure 12 As shown, the seed guide groove 603 is a chamfer on the circumferential surface where the seed metering wheel 6 contacts the seed 102, based on the original seed hole 601.

[0095] The depth of the seed hole 601 minus the depth of the seed guide groove 603 is y1, and y1 must be no less than 80% of the major axis dimension of the seed 102. The inclination angle of the seed guide groove 603 is θ, which is the angle between the generatrix L1 of the seed hole 601 near the cylindrical part of the outer shell 7 and the hypotenuse L3 of the seed guide groove 603 on the EE section without the inward angle.

[0096] Before operation, seeds 102 are stable within the feed hopper under gravity. When the size of the seed well 601 is similar to that of seeds 102, arching and bridging are likely to occur. The seed guide groove 603 on the seed well 601 effectively increases the contact area between the seed well 601 and seeds 102; and during the rotation of the seed metering wheel 6, seeds 102 can slide into the seed well 601 along the guide groove 603, which is beneficial for seed filling. A small inclination angle of the guide groove 603 does not significantly improve seed filling capacity, but a large angle can easily cause reseeding. Therefore, the seed guide groove is designed based on the major axis dimension L0 of small-to-medium diameter seeds 102, the depth y of the seed well 601, and the coefficient of friction μ between small-to-medium diameter seeds and the wall of the seed well 601. To ensure that the seed 102 does not fall out of the hole while vertical, i.e., the depth y1 of the eye hole 601 after deducting the depth of the seed guide groove 603 is not less than 80% of the major axis dimension of the seed 102, the length of the seed guide groove 603 in the depth direction of the eye hole 601 is designed to be a fixed value of 0.5 mm. The inclination angle of the seed guide groove 603 needs to be set to ensure that the component of gravity acting on the seed 102 is greater than the frictional force, i.e., cotθ > μ. The preliminary range of the inclination angle θ of the seed guide groove 603 is thus obtained.

[0097] Step 7: Based on the outer diameter D of the seed metering reel 6, the diameter d of the seedholes 601, the spacing d1 of the seedholes 601 in each row, the arc length l of the seed filling area I, and the angle α occupied by the seed filling area I, the number of rows of seedholes 601 is obtained, using the following formula:

[0098]

[0099] The seed metering device is driven by a speed-regulating motor. The number of eyelets 601 on the seed metering wheel 6 is not affected by the size of the ground wheel or the plant spacing, but only by the outer diameter D of the seed metering wheel 6, the diameter d of the eyelets 601, the spacing d1 of the eyelets 601 in each row, and the arc length l of the seed filling zone I. To prevent seed confusion during the filling process, the number of rows z of eyelets 601 can be expressed as:

[0100]

[0101] When the seed metering wheel 6 rotates at a constant speed, the more rows of eyelets 601 there are, the faster the unit moves forward and the higher the efficiency. Therefore, z should be the maximum value that satisfies the above formula.

[0102] Step 8: Based on the forward speed V of the unit, the plant spacing x, and the number of rows of eye holes 601 z, the rotational speed of the seed metering reel 6 is obtained, using the following formula:

[0103]

[0104] Step 9: According to the cycloid equation The cycloidal guide rail 5 model is established with the center of the seeding port at the bottom of the outer shell 7 as the origin of the coordinate axis; the straight line passing through the origin and perpendicular to the axis of the guide rod 20 is the X-axis, and the positive direction of the X-axis is the ray direction from the origin to the axis; the straight line passing through the origin and parallel to the axis of the guide rail 20 is the Y-axis.

[0105] The key to precision hill sowing lies in perfectly matching the hill-making time with the seed drop time. Experiments revealed that due to environmental factors and equipment precision limitations, it was difficult for the seed 102 to drop precisely into the hill hole. Therefore, a cycloidal guide rail 5 and an air pump 1 were added to the sowing port at the bottom of the outer casing 7. The cycloidal equation is...

[0106] When the hole-making device completes the drilling process, the seeds 102, under the action of the seed cleaning brush 10, fall from the seed discharging wheel 6 and reach the inlet of the cycloidal guide rail 5 via the guide plate 8. To ensure that the seeds 102 reach the hole immediately after drilling, an air jet 101 is provided at the inlet of the cycloidal guide rail 5. Since the tangent of the cycloidal line at the inlet is vertical, the air jet 101 is placed vertically against the guide plate 8. Under the action of the air jet, the seeds 102 quickly pass through the cycloidal guide rail 5; this time is negligible, thus completing the precision sowing of the seeds.

[0107] Step 10: Based on the diameter d at the bottom of the seed pile s Aerodynamic viscosity μ a , conveying airflow density ρ a and seed density ρ a The drag coefficient partitioning determination value k is obtained. a According to k a Query the drag coefficient partition table and retrieve the corresponding shape correction coefficient K. x Substituting into the formula, we obtain the theoretical levitation velocity v. x According to the theoretical levitation velocity v x The wind speed v is obtained. xmax Air pump flow rate V a And according to wind speed v xmax Air pump flow rate V a Select the appropriate jet pump. The formula is as follows:

[0108]

[0109] Suspension velocity is one of the important parameters for determining wind speed. Its expression is determined by the drag coefficient criterion value and is affected by physical properties such as seed size and density. The drag coefficient criterion value k is used for different zones. a With theoretical levitation velocity v x satisfy:

[0110]

[0111] In the formula, ka The drag coefficient is the zoning determination value; d s The diameter of the bottom of the seed pile, in mm; μ a aerodynamic viscosity; ρ a The density of the transported airflow; ρ s Seed density; v x K represents the theoretical levitation velocity, in m / s. x This is the shape correction factor.

[0112] Substituting the specific seed material characteristic parameters into the above formula yields the resistance coefficient zoning determination value k. a According to k a Query the drag coefficient partition table and retrieve the corresponding shape correction coefficient K. x The theoretical levitation velocity v can be obtained. x Suitable wind speed ensures stable seed transport and reduces power consumption and seed damage rate. The upper limit of the stable transport wind speed of the track should meet the requirements for stable seed suspension transport; the upper limit of the wind speed is taken as 1.5 times the theoretical suspension speed. Wind speed v xmax Air pump flow rate V a Should meet:

[0113]

[0114] In the formula, v xmax Wind speed, unit: m / s; d d V is the diameter of the jet hose, in mm; a This refers to the air pump flow rate, in meters (m³). 3 / s.

[0115] Step 11: Build a seed metering device model in Solidworks software using all the dimensional parameters obtained in Steps 1 to 10. Use the depth y of the eyelet 601, the diameter d of the eyelet 601, the inward angle γ of the eyelet 601, the inclination angle θ of the seed guide groove 603, and the rotational speed n of the seed metering wheel 6 as adjustment variables to build multiple simulation models. Convert the models to STL format and import them into EDEM. Select the eyelet 601 depth y, eyelet 601 diameter d, eyelet 601 inward angle γ, seed guide groove 603 inclination angle θ, and seed metering wheel 6 rotational speed n from the simulation model with the highest pass rate among several simulation models as the parameters of the final seed metering device.

[0116] Example 1:

[0117] The following section uses spinach seeds as an example to further explain the design method of this invention by incorporating various physical properties of spinach seeds into the design method of this invention.

[0118] Step 1: Spinach is planted using a narrow-row, dense-planting method, therefore the overall structure of the seed metering reel 6 should not be too large. After comprehensive consideration, the outer diameter D of the seed metering reel 6 is set at 80mm. The major axis dimension L0 of the spinach seed is 2.64mm. Substituting into the formula... The inner diameter D1 of the seed metering reel 6 is found to be ≤77.885, so we take 77mm.

[0119] Step 2: Substitute the major axis dimension L0 = 2.64 mm, minor axis dimension W0 = 2.42 mm, and thickness H0 = 1.71 mm of the spinach seed into the formula. The sphericity S of the spinach seed was obtained. p The percentage is 83%. Therefore, the initial design of the eyelet 601 is a dome-shaped cylinder.

[0120] Step 3: According to the seeding process of spinach, 3-5 seeds are sown per hole, so the number of seed holes 601 in each row of seed reel 6 is 3.

[0121] Step 4: Measure the spinach seeds with the following dimensions: major axis L0 = 2.64 mm, minor axis W0 = 2.42 mm, thickness H0 = 1.71 mm, and length correction factor k. a The width correction factor is 1.2. b The value is 1.5 and the thickness correction factor k c Substituting 2 into the formula, the preliminary parameter range of the eye socket 601 is obtained as follows:

[0122]

[0123] Step 5: Initially select the range of the inward angle as 0-20°.

[0124] Step 6: Based on the major axis dimension L0 = 2.64 mm of the spinach seed and the range of the depth y of the eye hole 601, determine the length of the seed guide groove 603 in the depth direction of the eye hole 601 as a fixed value of 0.5 mm; substitute the friction coefficient μ between small and medium diameter seeds and the wall of the eye hole 601, which is 0.45, into the formula to obtain the inclination angle θ of the seed guide groove 603 < 67.22°.

[0125] Step 7: Substitute the outer diameter D of the seed metering wheel 6 (80mm), the maximum diameter d of the seed hole 601 (3.42mm), the spacing d1 of the seed holes 601 in each row, the arc length l of the seed filling zone I, and the angle α of the seed filling zone I (60°) into the formula to obtain the number of rows of seed holes 601 z < 10.31. When the seed metering wheel speed is constant, the more rows of seed holes 601 there are, the faster the machine moves forward and the higher the efficiency. Therefore, z is taken as 10.

[0126] Step 8: Taking into account both operational efficiency and seeding performance, the rotational speed of seeding wheel 6 is determined to be 10-40 r / min.

[0127] Step 9: According to the cycloid equation The cycloidal guide rail 5 model is established with the center of the seeding port at the bottom of the outer shell 7 as the origin of the coordinate axis; the straight line passing through the origin and perpendicular to the axis of the guide rod 20 is the X-axis, and the positive direction of the X-axis is the ray direction from the origin to the axis; the straight line passing through the origin and parallel to the axis of the guide rail 20 is the Y-axis.

[0128] Step 10: Based on the diameter d at the bottom of the seed pile s Aerodynamic viscosity μ a 18.1×10 -6 Pa·s, transport gas density ρ a It is 1.205 kg / m 3 and seed density ρ s 1180kg / m 3 The drag coefficient partitioning determination value k is obtained. a =28.42; according to k a Query the drag coefficient partition table and retrieve the corresponding shape correction coefficient K. x =1.1, substituting into the formula, we obtain the theoretical levitation velocity v. x = 8.639 m / s; according to the theoretical suspension velocity v x The wind speed v is obtained. xmax =12.95m / s and air pump flow rate V a =14.04 L / min, and based on the wind speed v xmax Air pump flow rate V a Select the appropriate jet pump. Taking into account factors such as installation location and working environment, the jet pump model JS500U01 with a flow rate of 15L / min is selected.

[0129] Step 11: Build a seed metering device model in Solidworks software using all the dimensional parameters obtained in Steps 1 to 10, with the depth y and diameter d of the eye hole 601 within a certain range. The inward angle γ of the seed slit 601 (0-20°), the inclination angle θ of the seed guide groove 603 (<67.22°), and the rotational speed n of the seed metering wheel 6 (10-40 r / min) were used as adjustment variables to establish multiple simulation models. These models were then converted to STL format and imported into EDEM for simulation analysis. Table 1 shows the EDEM simulation parameters, and Table 2 shows the orthogonal experimental results for the inward angle γ, inclination angle θ, and rotational speed n.

[0130] Table 1 EDEM Simulation Parameters

[0131]

[0132]

[0133] Table 2

[0134]

[0135] Table 2 shows that the optimal combination of parameters is: γ = 5°, θ = 60°, n = 24 r / min. Single-factor analysis using the diameter d of the eyelet 601 yields d = 3 mm; single-factor analysis using the depth y of the eyelet 601 yields y = 3.1 mm as the optimal combination. Therefore, γ = 5°, θ = 60°, n = 24 r / min, d = 3 mm, and y = 3.1 mm are used as the output parameters for the seed metering device.

[0136] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A design method for a CFD-EDM-based pulse jet-assisted precision seeding device for film, wherein the precision seeding device includes a hole-making device and a seed metering device arranged in parallel, the hole-making device and the seed metering device being fixed on a moving device, characterized in that: The acupuncture device includes a vertically arranged base plate (14) fixedly connected to a moving device, a horizontally arranged motor (12) fixed to the base plate (14) by a bracket (13), a crank (15) fixedly connected to the output end of the motor (12), and a first connecting rod (16) hinged to the crank (15). It also includes a second connecting rod (17), a third connecting rod (18), and a fourth connecting rod (19). The first connecting rod (16), the second connecting rod (17), the third connecting rod (18), and the fourth connecting rod (19) are connected in series. Four connecting rods (19) are connected end to end in sequence. The end of the fourth connecting rod (19) is connected to a guide rod (20). The other end of the guide rod (20) is fixedly connected to a drill bit (22) by a thread. The seed metering device includes an outer shell (7) composed of two square boxes stacked vertically, a seed metering wheel (6) that passes through the circular opening in the middle of the lower box of the outer shell (7) and is mounted inside the outer shell (7), and a blocking wheel (9) that extends into the seed metering wheel (6). The vertical center lines of the two square boxes of the outer shell (7) do not coincide. The upper box body is offset away from the hole-making device. The seed-dispensing wheel (6) is rotatably connected to the outer shell (7), and the circumferential surface of the seed-dispensing wheel (6) near the hole-making device is in contact with the inner wall of the outer shell (7). The seed-dispensing wheel (6) is a cylindrical shell with one end open. Several pit holes (601) are arranged in an array along the circumferential direction on the circumferential surface of the seed-dispensing wheel (6). The seed-dispensing wheel (6) has a connecting shaft at its axis that is connected to the rotating component on the moving device. The blocking wheel (9) extends from the open end of the seed-dispensing wheel (6). Inside the seeding wheel (6), the outer wall of the blocking wheel (9) fits against the inner wall of the seeding wheel (6); a seeding port is provided in the center of the bottom of the outer shell (7), and a cycloidal guide rail (5) is provided at the seeding port. One end of the cycloidal guide rail (5) is provided at the seeding port at the bottom of the outer shell (7), and the other end is horizontally facing the hole-making device; a jet pump (1) is also provided at the seeding port at the bottom of the outer shell (7). The jet pump (1) includes a jet nozzle (101), which faces the cycloidal guide rail (5) from top to bottom; The design methodology includes the following steps: Step 1: Based on the long axis dimension of small and medium-sized seeds The outer diameter D and inner diameter D1 of the seed metering reel (6) are obtained in mm, and the formula is as follows: ； Step 2: Based on the long axis dimensions of small and medium-sized seeds minor axis dimensions and thickness From the formula To obtain the sphericity of small and medium-sized seeds If the sphericity If the percentage is greater than or equal to 50%, then use a dome-shaped cylindrical eyelet (601); otherwise, use an irregularly shaped eyelet (601). Step 3: Based on the specific seed type and planting process, obtain the number of eye holes (601) per row; Step 4: Based on the long axis dimensions of small and medium-sized seeds minor axis dimensions ,thickness The orientation constraints of small and medium-sized seeds within the eye opening (601) are considered, and the initial diameter d and initial depth y range of the eye opening (601) are obtained using the following formulas: Vertical position: ; supine position: ; Side-lying position: ; In the formula, This is a length correction factor; This is a width correction factor; This is the thickness correction factor; Step 5: Preliminary selection of the inner angle of the eyelet (601) ; Step 6: Based on the long axis dimension of small and medium-sized seeds The depth y of the pit (601), and the coefficient of friction between small and medium-sized seeds and the wall of the pit (601). From the formula The depth and initial range of the inclination angle θ of the seed guide groove (603) are obtained; Step 7: Based on the outer diameter D of the seed metering reel (6), the diameter d of the eye holes (601), the spacing d1 of the eye holes (601) in each row, and the arc length of the seed filling zone I. The angle α occupied by the seed filling area I is used to obtain the number of rows z of the eye openings (601), as shown in the following formula: ； Step 8: Based on the forward speed V of the unit, the plant spacing x, and the number of rows of eye holes (601) z, the rotational speed n of the seed metering wheel (6) is obtained, as follows: ； Step 9: Based on the cycloidal equation, and with the center of the seeding port at the bottom of the shell (7) as the origin of the coordinate axis; with the straight line passing through the origin and perpendicular to the axis of the guide rod (20) as the X-axis, and the positive direction of the X-axis as the ray direction from the origin to the axis; and with the straight line passing through the origin and parallel to the axis of the guide rod (20) as the Y-axis, establish the cycloidal guide rail (5) model. Step 10: Based on the diameter d at the bottom of the seed pile s Aerodynamic viscosity Transport airflow density and seed density The drag coefficient zoning determination value is obtained. ;according to Query the drag coefficient partition table and retrieve the corresponding shape correction coefficient. Substituting into the formula, we obtain the theoretical levitation velocity. According to the theoretical levitation speed To obtain wind speed Air pump flow rate And according to wind speed Air pump flow rate Select the appropriate jet pump; the formula is as follows: ； ； Step 11: Build a seed metering device model in Solidworks software using all the dimensional parameters obtained in Steps 1 to 10, including the depth y of the eye hole (601), the diameter d of the eye hole (601), the inward angle γ of the eye hole (601), and the inclination angle of the seed guide groove (603). The rotational speed n of the seed metering wheel (6) was used as an adjustment variable to establish multiple simulation models. After converting the models into STL format, they were imported into EDEM. The depth y of the eye hole (601), the diameter d of the eye hole (601), the inward angle γ of the eye hole (601), and the inclination angle of the seed guide groove (603) of the simulation model with the highest pass rate among several simulation models were selected. The rotational speed n of the seed metering wheel (6) is used as the parameter of the final seed metering device.

2. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 1, characterized in that: A limiter (21) is also fitted on the guide rod (20). The limiter (21) is fixedly connected to the base plate (14). A baffle (23) is also provided near the position where the guide rod (20) is connected to the drill bit (22). The baffle (23) is cylindrical and parallel to the guide rod (20).

3. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 2, characterized in that: A flow guide plate (8) is also provided between the seeding wheel (6) and the seeding port at the bottom of the outer shell (7).

4. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 3, characterized in that: The blocking wheel (9) has a notch in its circumference, and a seeding brush (10) is provided at the notch. The seeding brush (10) faces the seeding wheel (6) and is perpendicular to the circumference of the seeding wheel (6).

5. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 4, characterized in that: The notch of the blocking wheel (9) occupies one-quarter of the full circumference of the blocking wheel (9), and the seeding brush (10) is arranged vertically.

6. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 4, characterized in that: The seeding wheel (6) is fitted with a left slider (2) and a right slider (3) connected to the outer shell (7) via a sliding groove on the side away from the seeding device.

7. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 4, characterized in that: The upper side of the outer shell (7) is inclined toward the seed-discharging wheel (6) on the side away from the seed-making device, and a discharge plate (4) is provided at the inclined position of the outer shell (7).

8. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 4, characterized in that: Inside the upper box of the outer shell (7), a seed cleaning brush (11) is also vertically arranged. The seed cleaning brush (11) is fixedly connected to the outer shell (7) and faces the seed metering wheel (6). The seed cleaning brush (11) is in contact with the circumferential surface of the seed metering wheel (6).

9. The design method of the CFD-EDM-based pulse jet-assisted precision seeding device for film as described in claim 1, characterized in that: The length correction coefficient in step four The value range is 1-2, and the width correction factor is... The value range is 1-2, and the thickness correction factor is... The value range is 1.5-3.

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