Pneumatic conveying type seed metering system based on secondary acceleration of seed flow

Abstract

The invention relates to the technical field of air-assisted seeding, in particular to an air-assisted seeding system based on seed flow secondary acceleration, which comprises a Venturi seed mixing device, a conveying pipe, a bent pipe, a seed flow secondary accelerator, a corrugated pipe and a distributor which are sequentially arranged along the seed conveying direction, the venturi type seed mixing device and the conveying pipe are horizontally arranged; the seed flow secondary accelerator, the corrugated pipe and the distributor are vertically arranged; the seed flow secondary accelerator comprises an acceleration section of which the cross section is gradually reduced in the seed conveying direction and is used for increasing the seed flow velocity; a plurality of corrugated sections are arranged on the inner wall of the corrugated pipe at intervals; the distributor is used for uniformly discharging seeds to the periphery. The seed flow secondary accelerator, the corrugated pipe and the distributor are arranged, so that the system is more uniform and smooth in seed metering, the performance requirements of large seeding rate, high speed and uniform seeding of different rice and wheat seeds can be met, the structure is simple, the installation requirement is low, maintenance is convenient, and popularization is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of air-conveying seeding, and in particular to an air-conveying seeding system based on secondary acceleration of seed flow. Background Art

[0002] Rice and wheat are important food crops. my country has planting areas for both in Northwest China, Northeast China and Xinjiang. The existing seeding machines are mainly single special models, which have problems such as low operating efficiency, small seeding adjustment range and high machine idle rate.

[0003] The air-supplied seeding device provides seeds stably through the seed supply device, and transports seeds under the impetus of high-speed airflow. The seeds are evenly distributed to each seeding tube through the distributor. It has the characteristics of simple structure, strong versatility and large seeding volume. It can be applied to many types of crops and meet the requirements of high-speed operation. Therefore, the research of high-speed, rice and wheat dual-purpose air-supplied collective seeding machine is of great significance to meet the needs of large-scale operations and improve operation efficiency.

[0004] In the prior art, due to the structural arrangement of mechanical equipment, pneumatic seeding systems usually require a bend to change the direction of seed flow. However, when the seed flow passes through the bend, it is affected by centrifugal force and the seeds tend to accumulate on one side of the bend. This phenomenon is called the accumulation effect. This effect will make the seed distribution uniform, resulting in uneven discharge of seeds by the seeding system. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide an air-conveying seeding system based on a seed flow secondary accelerator, in which a seed flow secondary accelerator and a bellows are arranged to solve the problem of uneven distribution of seeds discharged by the seeding system due to poor uniformity of seed distribution caused by the accumulation effect of the bent pipe.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: An air-conveying seeding system based on secondary acceleration of seed flow comprises a Venturi-type seed mixing device, a conveying pipe, a curved pipe, a seed flow secondary accelerator, a bellows and a distributor which are arranged in sequence along the seed conveying direction; the Venturi-type seed mixing device and the conveying pipe are placed horizontally, and the seed flow secondary accelerator, the bellows and the distributor are placed vertically; the seed flow secondary accelerator comprises an acceleration section with a gradually reduced cross-section along the seed conveying direction, and the acceleration section is used to increase the seed flow velocity; a plurality of corrugated sections are arranged at intervals on the inner wall of the bellows; and the distributor is used to uniformly discharge seeds to all sides.

[0007] Furthermore, the seed flow secondary accelerator includes an inlet section, an acceleration section and an outlet section which are arranged in sequence along the seed conveying direction, wherein the cross-section of the acceleration section gradually decreases along the seed conveying direction, the cross-sectional area of ​​the inlet section is equal to the maximum cross-sectional area of ​​the acceleration section, and the cross-sectional area of ​​the outlet section is equal to the minimum cross-sectional area of ​​the acceleration section.

[0008] Furthermore, the corrugated pipe also includes a straight pipe section, and a plurality of corrugated sections and a plurality of straight pipe sections are evenly spaced and arranged.

[0009] Furthermore, the distributor includes a chassis, a top cover and multiple branch pipes; a downward arc-shaped protrusion is arranged at the center of the top cover, and a circle of arc-shaped grooves are arranged around the arc-shaped protrusion, and the grooves face downward, so that the radial cross-section of the top cover is in the shape of an "m"; a connecting port for connecting a corrugated pipe is arranged in the middle of the chassis, and a circle of arc-shaped protrusions are arranged around the connecting port, and the protrusions face upward; a cavity channel for seed discharge is formed between the chassis and the top cover.

[0010] Furthermore, the edge above the chassis is provided with a plurality of arrow-shaped buckles periodically arranged along the circumferential direction, the arrow direction of the arrow-shaped buckles points to the center of the chassis, and one end of the branch pipe is provided with a fastener corresponding to the arrow-shaped buckle, and the branch pipe is installed in the channel formed between two adjacent arrow-shaped buckles through the fastener.

[0011] Furthermore, the Venturi-type seed mixing device includes an airflow duct assembly for introducing airflow and a seed inlet channel assembly for adding seeds, wherein the airflow duct assembly is placed horizontally and the seed inlet channel assembly is arranged above the airflow duct assembly; the airflow duct assembly includes an air intake section, a seed mixing section and a diffusion section, wherein the seed inlet channel assembly is arranged above the seed mixing section and connected to the seed mixing section; the diffusion section is connected to the conveying pipe.

[0012] Furthermore, a seed unloading port is provided below the seed mixing section, and a cover plate is detachably installed at the seed unloading port.

[0013] Furthermore, the seeding system also includes a seeding pipe, and the branch pipes are connected to the seeding pipes in a one-to-one correspondence.

[0014] Furthermore, the bent pipe is a quarter arc bent pipe.

[0015] Furthermore, the chassis and the top cover are fixedly connected by bolts.

[0016] In general, the present invention has the following advantages: 1. The present invention provides a seed flow secondary accelerator and a bellows, so that the seed flow is accelerated when flowing through the seed flow secondary accelerator, and then passes through the bellows with uneven interior, thereby increasing the collision frequency between the seeds and the bellows, making the seed distribution more uniform, and solving the problem of uneven seed distribution caused by the accumulation phenomenon when the seed flow passes through the curved pipe section.

[0017] 2. The distributor of the present invention is designed with a top cover and a bottom plate with special shapes, so that a seed discharge cavity channel with a special shape is formed between the top cover and the bottom plate, and the channel is arc-shaped, so that the movement of the seed flow is smoother.

[0018] 3. In the present invention, the edge above the chassis is provided with a plurality of arrow-shaped buckles periodically arranged along the circumferential direction, and the arrow direction of the arrow-shaped buckles points to the center of the chassis, so that the channel formed between the two arrow-shaped buckles becomes narrower from wide, making the seeds enter more smoothly and not easy to get stuck.

[0019] 4. The present invention provides a seed unloading port below the seed mixing section and a detachable cover plate at the seed unloading port, which is convenient for replacing seeds and also convenient for unblocking and maintenance when seeds are stuck.

[0020] 5. The dispenser of the present invention has a simple structure and is easy to install. When a fault occurs or the seeds are stuck, it is convenient to replace and disassemble the parts for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a cross-sectional view of the present invention.

[0023] Figure 3 It is a cross-sectional view of the seed flow secondary accelerator of the present invention.

[0024] Figure 4 It is a cross-sectional view of the bellows of the present invention.

[0025] Figure 5 is an isolated view of the dispenser of the present invention.

[0026] Figure 6 yes Figure 3 A partial enlarged schematic diagram of a in the figure.

[0027] Figure 7 It is a cross-sectional view of the dispenser top cover of the present invention.

[0028] Figure 8 It is a cross-sectional view of the Venturi type seed mixing device of the present invention.

[0029] Fig. 9It is a schematic diagram of the Venturi type seed mixing device of the present invention.

[0030] in, 1 is a Venturi type seed mixing device, 11 is an air flow duct assembly, 111 is an air intake section, 112 is a seed mixing section, 113 is a cover plate, 114 is a diffusion section, and 12 is a seed intake duct assembly; 2 is a delivery pipe; 3 is a bend pipe; 4 is a seed flow secondary accelerator, 41 is an inlet section, 42 is an acceleration section, and 43 is an outlet section; 5 is a bellows, 51 is a bellows section, and 52 is a straight pipe section; 6 is a distributor, 61 is a bottom plate, 612 is a connection port, 613 is a protrusion, 62 is a top cover, 621 is an arc-shaped protrusion, 622 is a groove, 63 is an arrow-shaped buckle, 64 is a branch pipe, 641 is a fastener, 7, seed row pipe. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0032] like Figure 1-9 As shown, an air-conveying seeding system based on secondary acceleration of seed flow includes a Venturi-type seed mixing device, a conveying pipe, a curved pipe, a seed flow secondary accelerator, a bellows and a distributor which are sequentially arranged along the seed conveying direction; the Venturi-type seed mixing device and the conveying pipe are placed horizontally, and the seed flow secondary accelerator, the bellows and the distributor are placed vertically; the seed flow secondary accelerator includes an acceleration section with a gradually reduced cross-section along the seed conveying direction, and the acceleration section is used to increase the seed flow velocity; a plurality of corrugated sections are arranged at intervals on the inner wall of the bellows; and the distributor is used to evenly discharge seeds to all sides.

[0033] like Figure 3 As shown, the seed flow secondary accelerator includes an inlet section, an acceleration section and an outlet section which are arranged in sequence along the seed conveying direction, wherein the cross-section of the acceleration section gradually decreases along the seed conveying direction, the cross-sectional area of ​​the inlet section is equal to the maximum cross-sectional area of ​​the acceleration section, and the cross-sectional area of ​​the outlet section is equal to the minimum cross-sectional area of ​​the acceleration section.

[0034] like Figure 4 As shown, the corrugated pipe also includes a straight pipe section, and a plurality of corrugated sections and a plurality of straight pipe sections are evenly spaced and arranged.

[0035] Specifically, the cross section of the acceleration section of the seed flow secondary accelerator is gradually reduced along the seed conveying direction. According to the control equation principle of fluid mechanics, when the seed flow flows through the acceleration section with a reduced variable cross section, the flow velocity will increase. When the accelerated seed flow passes through the corrugated pipe, the seeds in the seed flow will collide with the uneven inner wall of the corrugated pipe, and the seed flow will increase the collision frequency between the seeds and the inner wall of the corrugated pipe after acceleration, so that the distribution of seeds is more uniform, which solves the problem of uneven distribution of seeds in the seed flow caused by the accumulation effect when the seed flow flows through the curved pipe.

[0036] like Figure 5-7 As shown, the distributor includes a chassis, a top cover and multiple branch pipes; wherein a downward arc-shaped protrusion is provided at the center of the top cover, and a circle of arc-shaped grooves are provided around the arc-shaped protrusion, and the grooves face downward, so that the radial cross-section of the top cover is in the shape of an "M"; wherein a connection port for connecting a corrugated pipe is provided in the middle of the chassis, and a circle of arc-shaped protrusions are provided around the connection port, and the protrusions face upward; a cavity channel for seeding is formed between the chassis and the top cover. The edge above the chassis is provided with multiple arrow-shaped buckles periodically arranged along the circumference, and the arrow direction of the arrow-shaped buckles points to the center of the chassis, and one end of the branch pipe is provided with a fastener corresponding to the arrow-shaped buckle, and the branch pipe is installed in the channel formed between two adjacent arrow-shaped buckles through the fastener. The chassis and the top cover are fixedly connected by bolts.

[0037] Specifically, a cavity channel with a special shape is formed between the bottom plate and the top cover. This cavity channel rises in an arc shape, descends in an arc shape, and then enters the straight section before the branch pipe from the connection port to the channel. This design makes the movement trajectory of the seeds arc-shaped, which can make the movement of the seeds in the distributor smoother. The straight section before entering the branch pipe is a channel formed by two adjacent arrow-shaped buckles. The arrows of the arrow-shaped buckles point to the center of the bottom plate, forming a channel that narrows from wide to narrow, similar to a funnel, which facilitates the seeds to enter the branch pipe smoothly, thereby achieving smooth seeding and reducing the phenomenon of stuck seeds.

[0038] The distributor uses bolt connections to assemble the top cover and chassis, which is convenient for disassembly and assembly, and easy to replace when parts fail. In addition, the parts are easy to process, reducing mass production costs.

[0039] like Figure 8-9 As shown, the Venturi-type seed mixing device includes an airflow duct assembly for introducing airflow and a seed feeding channel assembly for adding seeds, wherein the airflow duct assembly is placed horizontally, and the seed feeding channel assembly is arranged above the airflow duct assembly; the airflow duct assembly includes an air intake section, a seed mixing section, and a diffusion section, wherein the seed feeding channel assembly is arranged above the seed mixing section and connected to the seed mixing section; the diffusion section is connected to the conveying pipe. A seed discharge port is arranged below the seed mixing section, and a cover plate is detachably installed at the seed discharge port.

[0040] Specifically, the Venturi-type seed mixing device is a prior art. In this embodiment, a seed unloading port is provided at the bottom of the seed mixing section, and a cover plate installed in a pull-out manner is provided at the seed unloading port. When the seed mixing device needs to be changed, or when seeds are stuck, the cover plate can be pulled out for seed changing or unblocking.

[0041] In this embodiment, the delivery pipe is a hose, and the Venturi-type mixing device, the delivery pipe and the bent pipe are fixedly connected by an iron hoop, the bent pipe and the seed flow secondary accelerator, the seed flow secondary accelerator and the bellows are fixedly connected by flanges and bolts, and the bellows and the distributor are fixedly connected by threads.

[0042] The working principle of the present invention is: The Venturi-type seed mixing device connects the air intake section with the positive pressure port of the fan, and places the seeds from the seed inlet channel assembly. The seed flow flows through the Venturi-type seed mixing device, the conveying pipe, the elbow, the seed flow secondary accelerator, the bellows and the distributor in sequence. The Venturi-type seed mixing device accelerates the seed flow once. After the seed flow passes through the conveying pipe, the elbow changes the movement direction of the seed flow from horizontal to vertical. The seed flow is accelerated twice through the seed flow secondary accelerator. The seed flow passes through the uneven inner wall of the bellows to increase the number of collisions, making the seed distribution more uniform. After the seeds are evenly distributed, the seed flow flows into the distributor, and uniform seeding in all directions is achieved through the distributor.

[0043] In general, the present invention solves the problem of uneven seed distribution caused by the accumulation of seed flow when passing through the curved pipe section by setting a seed flow secondary accelerator and a bellows, thereby making the seeding more uniform; and by setting a distributor with a cavity channel of a special shape, the seeding is made more uniform and smooth. The present invention can meet the requirements of large sowing amount, high speed and uniform sowing performance of different rice and wheat seeds, and has a simple structure, low installation requirements, and convenient maintenance, which is conducive to promotion.

[0044] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An air-transported seeding system based on secondary acceleration of seed flow, characterized in that: It includes a Venturi-type seed mixing device, a conveying pipe, a curved pipe, a seed flow secondary accelerator, a bellows and a distributor which are arranged in sequence along the seed conveying direction; the Venturi-type seed mixing device and the conveying pipe are placed horizontally, and the seed flow secondary accelerator, the bellows and the distributor are placed vertically; the seed flow secondary accelerator includes an acceleration section with a gradually reduced cross-section along the seed conveying direction, and the acceleration section is used to increase the seed flow velocity; a plurality of corrugated sections are arranged at intervals on the inner wall of the bellows; and the distributor is used to evenly discharge seeds to all sides.

2. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 1, characterized in that: The seed flow secondary accelerator comprises an inlet section, an acceleration section and an outlet section which are sequentially arranged along the seed conveying direction, wherein the cross section of the acceleration section gradually decreases along the seed conveying direction, the cross section area of ​​the inlet section is equal to the maximum cross section area of ​​the acceleration section, and the cross section area of ​​the outlet section is equal to the minimum cross section area of ​​the acceleration section.

3. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 1, characterized in that: The corrugated pipe also includes a straight pipe section, and a plurality of corrugated sections and a plurality of straight pipe sections are evenly spaced and arranged.

4. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 1, characterized in that: The distributor includes a chassis, a top cover and multiple branch pipes; a downward arc-shaped protrusion is arranged at the center of the top cover, and a circle of arc-shaped grooves are arranged around the arc-shaped protrusion, and the grooves face downward, so that the radial cross-section of the top cover is in the shape of an "M"; a connecting port for connecting a corrugated pipe is arranged in the middle of the chassis, and a circle of arc-shaped protrusions are arranged around the connecting port, and the protrusions face upward; a cavity channel for seed discharge is formed between the chassis and the top cover.

5. The air-transported seeding system based on secondary acceleration of seed flow according to claim 4, characterized in that: The edge above the chassis is provided with multiple arrow-shaped buckles periodically arranged along the circumferential direction, and the arrow direction of the arrow-shaped buckles points to the center of the chassis. One end of the branch pipe is provided with a fastener corresponding to the arrow-shaped buckle, and the branch pipe is installed in the channel formed between two adjacent arrow-shaped buckles through the fastener.

6. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 1, characterized in that: The Venturi-type seed mixing device includes an airflow duct assembly for introducing airflow and a seed inlet channel assembly for adding seeds, wherein the airflow duct assembly is placed horizontally and the seed inlet channel assembly is arranged above the airflow duct assembly; the airflow duct assembly includes an air intake section, a seed mixing section and a diffusion section, wherein the seed inlet channel assembly is arranged above the seed mixing section and connected to the seed mixing section; the diffusion section is connected to the conveying pipe.

7. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 6, characterized in that: A seed unloading port is arranged below the seed mixing section, and a cover plate is detachably installed at the seed unloading port.

8. The air-transported seeding system based on secondary acceleration of seed flow according to claim 4, characterized in that: The seeding system also includes a seeding pipe, and the branch pipes are connected to the seeding pipes in a one-to-one correspondence.

9. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 1, characterized in that: The elbow is a quarter arc elbow.

10. The air-conveying seeding system based on secondary acceleration of seed flow according to claim 4, characterized in that: The chassis and the top cover are connected by bolts.

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