Seed stepping conveying mechanism for rice seedling raising machine

Abstract

The utility model relates to a seed stepping conveying mechanism for a rice seedling raising machine. In nowadays society, the planting of rice seeds is more and more extensive, and the total yield of japonica rice in northeast China is greatly increased by shortening the distance between the real per unit area and the potential production capacity, so that the method has important significance. According to the utility model, the precision rice seed sowing equipment is improved and innovatively designed, and a novel stepping conveying mechanism is researched, so that the seeds are directionally arranged, the disordered seeds in the seed box can be separated, and the seeds are arranged along the long axis direction and continuously conveyed, and the precision of the seed metering quantity is greatly improved. Mainly aiming at the design of the stepping conveying mechanism, the motion trail of the seed pushing plate is analyzed, the speed of the seed pushing plate in the horizontal direction is detected, and the deformation, critical value and the like of a mechanical structure under the actual conditions of temperature, vibration, load and the like can be analyzed, so that high seed metering precision and high precision are realized. And meanwhile, the rice seed stepping conveying mechanism is absolutely safe in structure.

Description

Technical Field

[0001] The utility model belongs to the field of agricultural machinery, and specifically, it relates to a seed stepping conveying mechanism for a rice seedling raising machine. In the process of separating and conveying seeds from a seed box, the seeds can be arranged according to a certain rule, that is, the seeds are automatically arranged along their long axis direction, and in the process of conveying the directionally arranged seeds to a seed discharging port, it is ensured that the seeds can move continuously without changing the arrangement order. Background Art

[0002] It is well known that mechanical transplanting is the central link in the full mechanization of rice farming. Mechanization and standardization of rice seedling cultivation are prerequisites for the implementation of mechanical transplanting. Therefore, it is very important to develop new rice seedling cultivation and sowing equipment with superior performance, stability and reliability.

[0003] The existing vibrating rice seeding seeding device has a relatively simple mechanical structure and is easy to adjust, but its seeding method is only suitable for manual transplanting. Although the existing mechanical rice seeding seeding device can achieve seeding on the seeding tray, it has serious seed damage and low productivity. The existing pneumatic rice seeding seeding device is precisely suitable for seeding on the seeding tray required for mechanical transplanting, but its suction cup structure and suction needle structure are prone to clogging of the suction hole during the seed suction process, which is very inconvenient to clean, seriously affecting the sowing accuracy and sowing efficiency. Therefore, it is very important to develop rice seeding related equipment and devices with higher sowing accuracy, more stable operation, higher work efficiency, and suitable for mechanized transplanting standards.

[0004] In today's society, rice is planted more and more widely. It is of great significance to significantly increase the total output of Northeast japonica rice by narrowing the gap between the actual yield level and the potential production capacity. Here, we will improve and innovate the design of rice seed precision sowing equipment, and study a new stepping conveying mechanism to make the seeds directional, separate the disordered seeds in the seed box, and arrange and continuously convey the seeds along their long axis, which greatly improves the accuracy of the seed quantity.

[0005] The utility model mainly focuses on the design of the stepping conveying mechanism, analyzes the motion trajectory of the seed pushing plate, and detects the horizontal speed of the seed pushing plate. It can also analyze the deformation and critical value of the mechanical structure under actual conditions such as temperature, vibration, and load. This mechanism is modeled using Pro-E (such as Figure 1 ) After comprehensive analysis, a super rice stepping conveying mechanism was designed that can meet the stepping conveying capacity, high seeding accuracy and absolutely safe structure. Summary of the invention

[0006] The utility model relates to a seed stepping conveying mechanism for a rice seedling raising machine, which mainly consists of a frame, a seed supply mechanism and a horizontal conveying transmission system, a seed box, a seed cleaning brush, a seed directional slideway assembly, a seed separation feeding mechanism, an adjustment screw assembly, a tensioning mechanism, a seed discharge port and a horizontal conveyor belt assembly. The seed directional slideway is mainly composed of a slideway bracket and a group of slideways assembled in parallel. The structure is as follows Figure 2 and Figure 3 As shown, Figure 3 for Figure 2 KK cross-section diagram.

[0007] The working process is as follows: the seeds in the seed box first fall into a group of V-shaped grooves formed by the slideway, and the serrated seed pusher at the bottom of the V-shaped groove pushes and carries the seeds in the V-shaped groove to move to the seed discharge port. At the same time, the seeds are gradually moved to the bottom of the V-shaped groove by the action of the inclined groove surface and its own gravity, forming a continuous seed flow whose long axis direction is consistent with the moving direction. At this time, the belt speed of the horizontal conveyor belt is adjusted, and the seeds continuously and directional discharged from the seed discharge port can be distributed in the seedling tray, pot tray or planting belt located on the horizontal conveyor belt at a certain spacing.

[0008] In the process of separating and transporting the seeds from the seed box, the seeds can be arranged according to a certain pattern, that is, the seeds are automatically arranged along their long axis. In the process of transporting the aligned seeds to the seed discharge port, the seeds can move continuously without changing the arrangement order. The designed conveying mechanism must meet the requirements of the super rice planting belt equipment and facilitate the pressing of the paper belt.

[0009] The function of the seed pushing plate is to realize the separation and feeding of seeds. It is connected to the four-bar mechanism, and driven by it, it can separate and orient the seeds in the seed box and move them evenly and continuously along the bottom of the V-shaped groove to the seed discharge port, and ensure that the seeds are continuously discharged from the directional port.

[0010] The structure of the seed pusher is as follows: Figure 4 As shown. The main features are pin holes at both ends and saw teeth with a certain spacing on the upper surface. The function of the pin hole is to connect and position the seed pusher plate with the plate tooth bracket. The spacing is the same as the spacing between the two V-shaped grooves formed by the two adjacent slideways, that is, the seed pusher plate is located between the Y-shaped gap formed by the two adjacent slideways, and moves along the D-shaped track under the drive of the hinge four-bar mechanism ( Figure 2 The leftmost fulcrum of the middle four-link movement track is parallel to the length of the slideway, which can gradually separate the seeds in the seed box and push the seeds step by step along the long axis along the slideway to the seed discharge port. The curved track is the return track of the seed pusher. The sawtooth is used to locate the rice seeds and continuously push the rice seeds forward under the drive of the four-link mechanism.

[0011] like Figure 5As shown in the figure, the parameters that need to be determined for the seed pusher are the length l, height h, thickness d, sawtooth height h1, and sawtooth spacing l1 of the seed pusher. The dimensions of l and h are affected by the dimensions of the whole machine. At the same time, the seed pusher is used in conjunction with the slideway to separate and orient the seeds in the seed box and move them uniformly and continuously to the seed discharge port along the bottom of the V-shaped groove. Therefore, the length l of the seed pusher must comprehensively consider the dimensions of the whole machine and the slideway, and be able to achieve the seed separation operation. Therefore, the length of the seed pusher is l = 948mm and h = 20mm.

[0012] The working position of the seed pusher is in the "I" strip gap formed by the two slideways, and it makes a "D" shaped track under the drive of the four-bar linkage mechanism. The gap of the "I" strip gap is 2mm. In order to make the seed pusher slide smoothly in it and not bend and deform to affect the seed pushing function, the thickness d of the seed pusher is 2mm, that is, d=2mm. The selection of the tooth height h1 and tooth pitch l1 of the seed pusher will directly affect whether the seeds can achieve uniform and continuous step-forward movement, so the selection of its values ​​should be determined based on the size of the rice seeds. Through the measurement of the seeds, its length, width and thickness can be seen from Table 1. At the same time, the super rice seed factory seedling agronomy requires 1 to 2 seeds per hole. Therefore, the distance of the saw teeth is set to the length of the rice seeds, and the height is set to the thickness of the rice seeds + 2mm. In this way, the seed pusher can push one seed forward each time, and it can also ensure that the seeds are automatically oriented along the long axis without rolling. Therefore, l1=7.5mm and h1=3mm are taken.

[0013] The utility model has the characteristics of reasonable and compact structure, easy installation and use, high sowing accuracy, more stable operation, higher work efficiency, etc., and is a seed stepping conveying mechanism suitable for rice seedling raising machines in factory-based seedling raising. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 :Three-dimensional simulation diagram of seed stepping conveying mechanism Figure 2 : Seed stepping conveying mechanism structure diagram attached Figure 3 : Figure 2 The cross-section diagram of KK is attached. Figure 4 : Schematic diagram of the seed pushing board Figure 5 :Pushing plate parameter diagram

[0015] Attached Figure 2 , Attachment Figure 3 In: 1 frame 2 transmission system A 3 seed box 4 seed cleaning brush 5 combined slide side plate 6 seed separation feeding mechanism 7 adjustment screw assembly 8 tensioning mechanism 9 seed discharge port 10 horizontal conveying assembly 11 transmission system B 12 slide A 13 slide B 14 slide bracket attachment Figure 4 Middle: 1 pin hole 2 saw teeth DETAILED DESCRIPTION

[0016] The following is a detailed description of the implementation of the utility model. The core problem of the utility model is the reasonable operation of the stepping mechanism. The working principle of the stepping mechanism is that the mechanism is composed of a hinged four-bar mechanism, a driving connecting rod, a plate tooth bracket and a seed pushing plate. The motion curve of the designed four-bar mechanism must be able to meet the requirement that the movement on one side is a linear motion, that is, a D-shaped trajectory ( Figure 1 The leftmost fulcrum of the four-link linkage moves along the same trajectory, and the four-link linkage is connected to the seed-pushing plate through a pin shaft, driving the seed-pushing plate to move along the same trajectory. Therefore, whenever the seed-pushing plate moves along a straight trajectory, it can push the seeds in the slideway forward. When it moves along a curved trajectory, it is a return process. The seed-pushing plate first drops and breaks away from continued contact with the seeds. When the D-shaped trajectory is completed, the seed-pushing plate completes the action of the teeth going around and contacts the seeds again, preparing to continue the next seed push. Since the tooth pitch on the seed-pushing plate can only accommodate a single seed, the seeds are arranged in a certain pattern in the slideway. When the seed-pushing plate continuously moves along a D-shaped trajectory, the seed-pushing plate continuously pushes the seeds forward, realizing continuous movement of the seeds. The four-link mechanism is connected to the driving connecting rod, and different driving speeds enable the seeds to move forward at different speeds, which is convenient for use with the super rice planting belt seedling raising equipment.

[0017] In the process of separating and conveying seeds from the seed box, this device can arrange the seeds according to a certain pattern, that is, the seeds are automatically arranged along their long axis. In the process of conveying the directionally arranged seeds to the seed discharge port, it is ensured that the seeds can move continuously without changing the arrangement order. The designed conveying mechanism must meet the requirements of super rice planting belt equipment and facilitate the pressing of paper belts.

[0018] Final note: The above technical features constitute the best implementation example of the utility model, which has strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A seed stepping conveying mechanism for a rice seedling raising machine, characterized by The machine consists of a frame, a seed supply mechanism and a horizontal conveying transmission system, a seed box, a seed cleaning brush, a seed directional slideway assembly, a seed separation and feeding mechanism, an adjustment screw assembly, a tensioning mechanism, a seed discharge port and a horizontal conveyor belt assembly, wherein the seed directional slideway assembly is mainly composed of a slideway bracket and a group of slideways assembled in parallel.

2. A seed stepping conveying mechanism for a rice seedling raising machine according to claim 1, characterized in that The horizontal conveying transmission system comprises a hinged four-bar mechanism, a driving connecting rod, a plate tooth bracket and a seed pushing plate.

3. A seed stepping conveying mechanism for a rice seedling raising machine according to claim 1, characterized in that The motion curve of the hinged four-bar mechanism in the seed supply mechanism and the horizontal conveying transmission system must be able to satisfy the requirement that the motion on one side is a linear motion.

4. A seed stepping conveying mechanism for a rice seedling raising machine according to claim 1, characterized in that The seed supply mechanism is connected with a driving connecting rod and a hinged four-bar mechanism in a horizontal conveying transmission system, and different driving speeds enable the seeds to be pushed forward at different speeds.

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