Agricultural constant-air-volume fan system based on centrifugal force

Abstract

The utility model discloses an agricultural constant-air-volume fan system based on centrifugal force, and mainly relates to the technical field of seeding machines. Comprising a rack and a positioning shaft, the positioning shaft is sequentially sleeved with a first coupler unit, a second coupler unit matched with the first coupler unit, a spring and an adjusting nut from left to right, and a plurality of inertia balls are evenly arranged on the outer side of the positioning shaft in the circumferential direction of the positioning shaft; a first connecting rod extending leftwards is arranged at the left end of one side, close to the positioning shaft, of the inertia ball, a second connecting rod extending rightwards is arranged at the right end of the inertia ball, one end of the first connecting rod is hinged to the inertia ball, the other end of the first connecting rod is hinged to the second coupler unit, one end of the second connecting rod is hinged to the inertia ball, and the other end of the second connecting rod is hinged to the positioning shaft; the centrifugal force and the spring are used for controlling the connection and disconnection of the coupler, so that the rotating speed of the fan blades is controlled, the purpose of controlling the air volume is achieved, and the stability of the performance of the air-blowing type seeding machine is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of seed drills, in particular to an agricultural constant air volume fan system based on centrifugal force. Background Art

[0002] An air seeder is a type of seeding equipment that uses compressed air from a fan to spray seeds onto the ground. It pushes seeds out of a container through compressed air and sprays them onto a field or planting bed through a nozzle. The working principle is that the seeds are placed in a container and pushed toward the nozzle through the compressed air from a fan. The nozzle is designed so that the seeds can be evenly dispersed when passing through the nozzle and sprayed onto the ground at an appropriate speed.

[0003] The compressed air used in the air seeder needs to be precisely regulated and controlled to achieve the best sowing effect. Therefore, the quantitative exhaust of the fan is crucial for the air seeder. However, in the actual use of the air seeder, the fan of the air seeder is directly connected to the tractor power output shaft, and the speed of the tractor power output is not fixed, so the exhaust air volume of the fan is unstable, resulting in unstable performance of the air seeder. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to provide an agricultural constant air volume fan system based on centrifugal force, which utilizes centrifugal force and a spring to control the connection and disconnection of a coupling, thereby controlling the rotation speed of the fan blades, thereby achieving the purpose of controlling the air volume and further ensuring the stability of the performance of an air-blown seeder.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] An agricultural constant air volume fan system based on centrifugal force comprises a frame and a positioning shaft, on which a first coupling unit, a second coupling unit matched with the first coupling unit, a spring and an adjusting nut are sequentially sleeved from left to right, wherein the first coupling unit is rotationally connected to the positioning shaft, the first coupling unit is mounted on the left end of the frame and rotationally connected to the frame, the second coupling unit is slidingly connected to the positioning shaft, the right end of the positioning shaft is mounted on the right end of the frame and rotationally connected to the frame, the left end of the first coupling unit is transmission-connected to a power system, and the positioning shaft The right end is drivingly connected to the fan blades of the fan, the positioning shaft is provided with an external thread adapted to the adjusting nut, one end of the spring abuts against the adjusting nut, and the other end abuts against the second coupling unit, a plurality of inertia balls are evenly arranged on the outer side of the positioning shaft along the circumference of the positioning shaft, a first connecting rod extending to the left side is arranged at the left end of the inertia ball close to the positioning shaft, and a second connecting rod extending to the right side is arranged at the right end, one end of the first connecting rod is hinged to the inertia ball, and the other end is hinged to the second coupling unit, one end of the second connecting rod is hinged to the inertia ball, and the other end is hinged to the positioning shaft.

[0007] Preferably, the rack is a U-shaped rack.

[0008] Preferably, the inner ring of the first coupling unit is rotatably connected to the positioning shaft via a first bearing, the outer ring of the first coupling unit is rotatably connected to the frame via a second bearing, and the right end of the positioning shaft is rotatably connected to the frame via a third bearing.

[0009] Preferably, the number of the inertia balls is two.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The utility model utilizes centrifugal force and a spring to control the connection and disconnection of a coupling, limits the rotation speed of a positioning shaft to a certain value, thereby controlling the rotation speed of a fan blade, thereby achieving the purpose of controlling the size of the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the plane structure of the utility model.

[0014] Numbers in the accompanying drawings: 1, frame; 2, positioning shaft; 3, first coupling unit; 4, second coupling unit; 5, spring; 6, adjusting nut; 7, inertia ball; 8, first connecting rod; 9, second connecting rod. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0016] Example: As shown in the attached Figure 1-2 As shown, the utility model is an agricultural constant air volume fan system based on centrifugal force, including a frame 1 and a positioning shaft 2. A first coupling unit 3, a second coupling unit 4 matched with the first coupling unit 3, a spring 5, and an adjusting nut 6 are sequentially sleeved on the positioning shaft 2 from left to right. The first coupling unit 3 is rotatably connected to the positioning shaft 2, the first coupling unit 3 is installed at the left end of the frame 1 and is rotatably connected to the frame 1, the second coupling unit 4 is slidably connected to the positioning shaft 2, the right end of the positioning shaft 2 is installed at the right end of the frame 1 and is rotatably connected to the frame 1, the left end of the first coupling unit 3 is transmission-connected to the power system, the right end of the positioning shaft 2 is transmission-connected to the blades of the fan, a flange for connecting to the blades is welded on the positioning shaft, and the fan consists of a shell and blades, and the shell is welded to the frame 1. The positioning shaft 2 is provided with an external thread adapted to the adjusting nut 6. When the adjusting nut 6 is rotated, the adjusting nut 6 moves along the positioning shaft 2. One end of the spring 5 abuts against the adjusting nut 6, and the other end abuts against the second coupling unit 4. The first coupling unit 3 and the second coupling unit 4 form a coupling. The thrust given to the second coupling unit 4 by the spring 5 ensures the transmission of power between the first coupling unit 3 and the second coupling unit 4. Adjusting the adjusting nut 6, the adjusting nut 6 can compress the spring 5 to the left to increase the elastic force; adjusting the nut 6 to the right can stretch the spring 5 to reduce the elastic force.

[0017] Preferably, gaskets are provided on both sides of the spring 5 .

[0018] A plurality of inertia balls 7 are evenly arranged on the outer side of the positioning shaft 2 along the circumference of the positioning shaft 2. The inertia ball 7 is a sphere with a certain weight. A mounting seat is arranged on the side of the inertia ball 7 close to the positioning shaft 2. A first connecting rod 8 extending to the left is arranged at the left end of the mounting seat, and a second connecting rod 9 extending to the right is arranged at the right end of the mounting seat. One end of the first connecting rod 8 is hinged to the mounting seat on the inertia ball 7, and the other end is hinged to the second coupling unit 4. One end of the second connecting rod 9 is hinged to the mounting seat on the inertia ball 7, and the other end is hinged to the positioning shaft 2. A hinge ear for hinged connection with the first connecting rod 8 and the second connecting rod 9 is welded on the positioning shaft 2.

[0019] Preferably, the frame 1 is a U-shaped frame.

[0020] Preferably, in order to ensure the stability of transmission, the inner ring of the first coupling unit 3 is rotatably connected to the positioning shaft 2 through the first bearing, the outer ring of the first coupling unit 3 is rotatably connected to the frame 1 through the second bearing, and the right end of the positioning shaft 2 is rotatably connected to the frame 1 through the third bearing.

[0021] Preferably, the number of the inertia balls 7 is two.

[0022] When the utility model is in use, power is input from the first coupling unit 3. At this time, the second coupling unit 4 and the first coupling unit 3 are in a closed state under the thrust of the spring 5, and the second coupling unit 4 will rotate together with the first coupling unit 3. Since the second coupling unit 4 and the inertia ball 7 are connected by the first connecting rod 8 and the second connecting rod 9, the positioning shaft 2 and the inertia ball 7 will also rotate together with the second coupling unit 4, thereby driving the fan blades to rotate. Under the action of centrifugal force, the inertia ball 7 will tend to move outward. Since the first connecting rod 8 connects the inertia ball 7 and the second coupling unit 4, the second coupling unit 4 also has a tendency to move to the right, that is, the second coupling unit 4 will have a force opposite to the elastic force of the spring 5 (denoted as F). When the speed of the first coupling unit 3 increases, F will increase. When the speed increases to a certain point, F will overcome the elastic force and make the second coupling unit 4 move to the right, so that the first coupling unit 3 is disconnected from the second coupling unit 4. Due to the inertia, the inertia ball will continue to rotate and continue to provide power to the positioning shaft 2 through the second connecting rod 9 to drive the fan blades. Since friction is inevitable, the speed of the inertia ball 7 will decrease over time, and the centrifugal force will decrease, and then F will decrease. When F is less than the elastic force, the second coupling unit 4 will move to the left until it is connected to the first coupling unit 3. Constant air volume can be achieved by repeatedly cycling the above steps.

Claims

1. An agricultural constant air volume fan system based on centrifugal force, characterized by: The invention comprises a frame (1) and a positioning shaft (2). A first coupling unit (3), a second coupling unit (4) matched with the first coupling unit (3), a spring (5), and an adjusting nut (6) are sequentially sleeved on the positioning shaft (2) from left to right. The first coupling unit (3) is rotationally connected to the positioning shaft (2). The first coupling unit (3) is mounted on the left end of the frame (1) and rotationally connected to the frame (1). The second coupling unit (4) is slidingly connected to the positioning shaft (2). The right end of the positioning shaft (2) is mounted on the right end of the frame (1) and rotationally connected to the frame (1). The left end of the first coupling unit (3) is transmission-connected to a power system. The right end of the positioning shaft (2) is rotationally connected to a fan. The fan blade transmission is connected, the positioning shaft (2) is provided with an external thread adapted to the adjusting nut (6), one end of the spring (5) is in contact with the adjusting nut (6), and the other end is in contact with the second coupling unit (4), a plurality of inertia balls (7) are evenly arranged on the outer side of the positioning shaft (2) along the circumference of the positioning shaft (2), a first connecting rod (8) extending to the left side is arranged at the left end of the inertia ball (7) close to the positioning shaft (2), and a second connecting rod (9) extending to the right side is arranged at the right end, one end of the first connecting rod (8) is hinged to the inertia ball (7), and the other end is hinged to the second coupling unit (4), one end of the second connecting rod (9) is hinged to the inertia ball (7), and the other end is hinged to the positioning shaft (2).

2. The agricultural constant air volume fan system based on centrifugal force according to claim 1 is characterized by: The frame (1) is a U-shaped frame.

3. The agricultural constant air volume fan system based on centrifugal force according to claim 1 is characterized by: The inner ring of the first coupling unit (3) is rotatably connected to the positioning shaft (2) via a first bearing, the outer ring of the first coupling unit (3) is rotatably connected to the frame (1) via a second bearing, and the right end of the positioning shaft (2) is rotatably connected to the frame (1) via a third bearing.

4. The agricultural constant air volume fan system based on centrifugal force according to claim 1 is characterized by: The number of the inertia balls (7) is two.

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