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CN-121970615-A - Corn cleaning device with differentiated screening strength

CN121970615ACN 121970615 ACN121970615 ACN 121970615ACN-121970615-A

Abstract

The invention provides a corn cleaning device with differential screening strength, which belongs to the field of corn harvesting machinery and comprises an upper screen box, a shaking plate, a lower screen box, a crank connecting rod mechanism and a centrifugal fan, wherein the centrifugal fan is fixedly connected with a harvester, the shaking plate is arranged above the centrifugal fan, one end of the shaking plate corresponds to a discharging hole of the threshing device, the other end of the shaking plate is provided with the upper screen box, the lower screen box is arranged below the upper screen box, one sides of the upper screen box and the lower screen box, which are far away from the centrifugal fan, are respectively connected with the harvester in a swinging way through connecting rods, and the upper screen box and the lower screen box realize reciprocating simple harmonic motion through rotation of a crank in the crank connecting rod mechanism.

Inventors

  • FU JUN
  • ZHANG JIALIANG
  • XUE ZHAO
  • FU QIANKUN

Assignees

  • 吉林大学

Dates

Publication Date
20260505
Application Date
20260407

Claims (6)

  1. 1. The corn cleaning device with the differentiated screening strength is characterized by comprising an upper screen box (1), a shaking plate (2), a lower screen box (3), a crank connecting rod mechanism (4) and a centrifugal fan (5), wherein the centrifugal fan (5) is fixedly connected with a harvester, the shaking plate (2) is arranged above the centrifugal fan (5), one end of the shaking plate (2) corresponds to a discharging hole of the threshing device, the other end of the shaking plate (2) is provided with the upper screen box (1), the lower screen box (3) is arranged below the upper screen box (1), one side, close to the centrifugal fan (5), of the upper screen box (1) and the lower screen box (3) is connected through the crank connecting rod mechanism (4), the crank connecting rod mechanism (4) is symmetrically arranged on two sides of the upper screen box (1) and the lower screen box (3), one side, far away from the centrifugal fan (5), of the upper screen box (1) and the lower screen box (3) are respectively connected with the harvester in a swinging mode through connecting rods, power sources of the crank connecting rod mechanism (4) and the centrifugal fan (5) are respectively sourced from the harvester, the harvester drives a crank (41) to rotate, and the crank (1) and the upper screen box (3) and the bottom of the harvester correspond to the lower screen box (3) in a reciprocating mode; The utility model provides an upward screen box (1) is including last two side baffles (11), go up shale shaker (12), tail screen (13) and last screen box support (14), go up two side baffles (11) symmetry setting, go up shale shaker (12) fixed setting between last two side baffles (11), tail screen (13) slope setting is between last two side baffles (11), and be located last shale shaker (12) rear portion, go up screen box support (14) and be fixed in two side baffles (11) front end, go up screen box support (14) and crank link mechanism (4) rotation connection, be provided with several change inclination characteristic unit (121) on last shale shaker (12).
  2. 2. The differential screening strength corn cleaning device as set forth in claim 1, wherein the upper vibrating screen (12) comprises a plurality of variable-pitch feature units (121), an upper fixing plate (122), a lower fixing plate (123) and cylindrical pins (124), the upper fixing plate (122) and the lower fixing plate (123) are symmetrically arranged on two sides of the variable-pitch feature units (121) respectively, the variable-pitch feature units (121) are uniformly arranged on the upper fixing plate (122) and the lower fixing plate (123) through the cylindrical pins (124), the variable-pitch feature units (121) comprise an upper parallel section (1211), a middle section (1212) and a lower parallel section (1213), equilateral square holes are uniformly distributed on the middle section (1212), and the upper fixing plate (122) and the lower fixing plate (123) are fixedly connected with the upper parallel section (1211) and the lower parallel section (1213) through the cylindrical pins (124) respectively; The upper parallel section (1211) and the middle section (1212) of the variable-pitch feature unit (121) are parallel to each other, and the pitch of the middle section (1212) is smaller than that of the upper parallel section (1211) and the middle section (1212); The structure of the tail screen (13) is the same as that of the upper vibrating screen (12).
  3. 3. The corn cleaning device with differential screening strength according to claim 2, wherein the shaking plate (2) comprises a guide strip (21) and a shell (22), the guide strip (21) is uniformly arranged above the shell (22), the guide strip (21) is in a zigzag shape and is fixed above the shell (22) through welding, and the surface of the shell (22) is in a step shape and the direction of the guide strip is consistent with the flowing direction of the corn cleaning material mixture.
  4. 4. A corn cleaning device with differential screening strength according to claim 3, wherein the lower screen box (3) comprises a lower vibrating screen (31), lower double-side baffles (32) and a lower screen box support (33), the lower double-side baffles (32) are symmetrically arranged, the lower vibrating screen (31) is fixedly arranged between the lower double-side baffles (32), the lower screen box support (33) is fixedly arranged at the front end of the lower double-side baffles (32), the lower screen box support (33) is rotatably connected with the crank connecting rod mechanism (4), and the structure of the lower vibrating screen (31) is identical to that of the upper vibrating screen (12).
  5. 5. The differential screening strength corn cleaning device of claim 4, wherein the crank-link mechanism (4) comprises a crank (41), a connecting rod (42) and a swinging rod (43), the crank (41) is connected with an output shaft of a transmission chain wheel, one end of the connecting rod (42) is rotatably connected with the crank (41) through a bearing, the other end of the connecting rod is hinged with the swinging rod (43), the swinging rod (43) has three hinge points, namely, the top end of the connecting rod is hinged with one end of the connecting rod (42), the middle of the swinging rod (43) is hinged with an upper screen box support (14), and the bottom end of the swinging rod (43) is hinged with a lower screen box support (33).
  6. 6. The corn cleaning device with differential screening strength according to claim 5, wherein the centrifugal fan (5) comprises a driving belt wheel (51), a fan shell (52), a spoke (53), a turbofan (54) and a fan shaft (55), the turbofan (54) is fixed with the fan shaft (55) through the spoke (53), the fan shaft (55) is rotatably arranged in the fan shell (52) through a bearing, the driving belt wheel (51) is arranged at one end of the fan shaft (55), and the fan shell (52) is fixedly connected with a harvester.

Description

Corn cleaning device with differentiated screening strength Technical Field The invention belongs to the field of corn harvesting machinery, and particularly relates to a corn cleaning device with differential screening strength. Background Corn is used as a first main grain crop in China, and the planting area and the total production amount of the corn are the first. The corn kernels can be mechanically and directly harvested to finish the working procedures of picking, threshing, cleaning, collecting and the like at one time, so that the working efficiency of corn production and harvesting can be remarkably improved, and the corn harvester has an important role in realizing the strategy of grain saving and loss reduction and promoting the stable and orderly development of the corn industry. The cleaning is an important procedure for directly harvesting corn kernels, and the performance of the cleaning directly determines the impurity content and loss rate of the corn kernels after harvesting, thereby affecting the harvesting quality of the corn kernels. At present, the production problems of high impurity content, high loss rate and the like of seeds caused by corn cleaning become key bottlenecks for limiting the corn harvesting quality. In the cleaning process, the corn cleaning material mixture is subjected to the coupling effect of fan airflow and vibration of the vibrating screen to separate impurity particles with smaller floating coefficients from corn kernels with larger floating speed, so that separation and cleaning of the corn kernels and the impurity particles are realized, and clean corn kernels are obtained. When the feeding quantity becomes large in the harvesting process, corn falling from the shaking plate of the cleaning device is more in material mixture to be cleaned, the front end of the upper vibrating screen is piled up, impurity particles in the piled up mixture restrict the sieving effect of corn kernels, and further the cleaning quality of the corn kernels is reduced. Therefore, the novel cleaning device which can efficiently separate corn kernels from the corn cleaning material mixture and promote the rapid separation of impurity particles is developed by taking the large feed production background as the demand guide, and has important significance in reducing the impurity content and loss rate of the corn kernels and improving the corn harvesting quality. Disclosure of Invention The invention aims to provide a corn cleaning device with differential screening strength, which can realize the efficient separation of corn kernels and impurity particles through a variable slope characteristic structure of an enhanced cleaning screen with an equilateral square hole structure, promote the rapid discharge of the impurity particles, further solve the problems of high impurity content and high loss rate of the corn kernels in the existing cleaning process, and effectively improve the corn harvesting quality. In order to achieve the above purpose, the present invention provides the following technical solutions: The corn cleaning device with the differential screening strength comprises an upper screen box, a shaking plate, a lower screen box, a crank connecting rod mechanism and a centrifugal fan, wherein the centrifugal fan is fixedly connected with a harvester, the shaking plate is arranged above the centrifugal fan, one end of the shaking plate corresponds to a discharging hole of the threshing device, the other end of the shaking plate is provided with the upper screen box, the lower screen box is arranged below the upper screen box, one sides of the upper screen box and the lower screen box, which are close to the centrifugal fan, are connected through the crank connecting rod mechanism, the crank connecting rod mechanism is symmetrically arranged on two sides of the upper screen box and the lower screen box, one sides of the upper screen box and the lower screen box, which are far away from the centrifugal fan, are respectively connected with the harvester in a swinging way through connecting rods, the crank connecting rod mechanism and a centrifugal fan power source are all derived from the harvester, the harvester drives a crank to rotate, and the reciprocating simple harmonic motion of the upper screen box and the lower screen box is realized through the crank connecting rod mechanism, and the bottom of the lower screen box corresponds to a seed collection device of the harvester; the upper screen box comprises upper double-side baffles, an upper vibrating screen, a tail screen and an upper screen box support, wherein the upper double-side baffles are symmetrically arranged, the upper vibrating screen is fixedly arranged between the upper double-side baffles, the tail screen is obliquely arranged between the upper double-side baffles and is positioned at the rear part of the upper vibrating screen, the upper screen box support is fixed at the front end of the upper double-side