Variable-gap classifier based on airfoil structure

Abstract

The present invention discloses a variable-gap classifier based on an airfoil structure, which comprises a frame, a power assembly, a classification unit and a support plate assembly; the power assembly includes a driving wheel, a driven wheel and a traction rope, the driving wheel and the driven wheel are both installed on the frame, and the traction rope is connected end to end and wound around the driving wheel and the driven wheel; the classification unit includes a classification bracket, a central shaft, wing plates and a wing driving assembly, the classification bracket is fixed on the traction rope, the central shaft is installed on the classification bracket, two wing plates are hinged to the central shaft in a V shape, and the wing driving assembly drives the two wing plates to open and close; the classification units are distributed along the traction rope, and the wing plates of adjacent classification units are in contact with each other; the present invention realizes the opening and closing of the wing plates through the cooperation of the support plate assembly and the wing driving assembly, generates gaps with gradually changing sizes between the wing plates of adjacent classification units, and users can control the gaps according to the requirements of the products to be classified, so that the classifier has a wider application range and better classification effect.

Description

Technical Field

[0001] The present invention relates to the field of mechanical equipment, and particularly to a variable-gap classifier based on an airfoil structure. Background Art

[0002] A classifier refers to a device used in the agricultural field for sizing agricultural products. Its main function is to screen and classify agricultural products (such as beans, blueberry fruits, tea leaves, etc.) according to their sizes. There are many types of classifiers in the prior art. For example, the Chinese patent application "A Tea Fresh Leaf Classifier for Preventing Breakage and Reddening" with the application number 202010811541.8 discloses a classifier including a machine shell, a screening and conveying mechanism, and a blanking hopper. This classifier uses a conveyor belt with a gradually changing width to achieve the screening of tea leaves. Its defect is that the width of the gap for screening tea leaves between the conveyor belts is fixed. Without the ability to adjust the gap, the entire device can only be used for tea leaf classification and cannot be applied to other crops, resulting in a narrow scope of application. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the gap of the classifier in the prior art does not have an adjustment function, resulting in a narrow scope of application.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a variable-gap classifier based on an airfoil structure, including a frame, a power assembly, a classification unit, and a support plate assembly;

[0005] The power assembly includes a driving wheel, a driven wheel, and a traction rope. The driving wheel and the driven wheel are both installed on the frame, and the traction rope is connected end to end and wound around the driving wheel and the driven wheel; <[

[0006] The classification unit includes a classification bracket, a central shaft, wing plates, and a wing driving assembly. The classification bracket is fixed on the traction rope, the central shaft is installed on the classification bracket, two wing plates are hinged to the central shaft in a V shape, and the wing driving assembly drives the two wing plates to open and close; the classification units are distributed along the traction rope, and the wing plates of adjacent classification units are in contact with each other. When the wing driving assembly drives the two wing plates to close, a gap is generated between the wing plates of adjacent classification units, and agricultural products can fall through the gap; if along the length direction of the traction rope, the closing degrees of the wing plates of different classification units are different, then the sizes of the gaps between the wing plates of adjacent classification units will also be different, and different-sized gaps can allow agricultural products of different sizes to leak through, thereby achieving the classification of agricultural products;

[0007] The support plate assembly is installed on the frame. When the traction rope pulls the classification assembly past the support plate assembly, the wing driving assembly drives the two wing plates to close; the support plate assembly is used to control the wing driving assembly to ensure that along the direction of the traction rope, the closing degree of the two wing plates gradually increases.

[0008] Specifically, the support plate assembly includes a first support plate, a second support plate, and three linear drivers mounted on the frame. The first support plate is fixed to the frame and is horizontal. The second support plate is inclined and mounted on the frame, and the first support plate is located above the second support plate. The three linear drivers are distributed along the length direction of the second support plate, and the telescopic rods of the three linear drivers are hinged to the second support plate.

[0009] The wing drive assembly includes a vertical pull rod, a connecting plate, a connecting rod, and a first spring. The grading bracket is provided with a bracket cross bar. The vertical pull rod passes through the bracket cross bar, and the top end of the vertical pull rod is fixed to the connecting plate. One end of the connecting rod is hinged to the wing plate and the other end is hinged to the connecting plate. The first spring is sleeved on the vertical pull rod, and the first spring is located between the connecting plate and the bracket cross bar. A first guide wheel aligned with the second support plate is provided on the side of the bottom end of the vertical pull rod.

[0010] When the towing rope moves, the entire grading unit moves horizontally along with the towing rope. When the grading unit moves to the position of the second support plate, the first guide wheel contacts the second support plate. Due to the inclination of the second support plate, the first guide wheel will gradually descend when moving horizontally along the second support plate. The vertical pull rod and the connecting plate will descend synchronously, thereby driving the connecting rod to pull the wing plate, so that the two wing plates in the grading unit are closed. This means that as the grading unit advances, the descending distance of the vertical pull rod increases, the closing degree of the two wing plates increases, and the gap between the wing plates of adjacent grading units increases.

[0011] Furthermore, the wing drive assembly further includes a limit bolt. The limit bolt is mounted on the connecting plate and is located above the bracket cross bar. The limit bolt is used to control the maximum descending distance of the vertical pull rod, and thus control the minimum included angle after the wing plates are closed.

[0012] When the first guide wheel translates along the second support plate, the second support plate will exert a downward pressure on the first guide wheel. This downward pressure will ultimately be transmitted to the towing rope through the grading bracket, causing the towing rope to deform. To overcome this defect, a second guide wheel aligned with the first support plate is provided on the bottom surface of the bracket cross bar. When the first guide wheel translates along the second support plate, the second guide wheel will also translate along the first support plate. The aforementioned downward pressure will ultimately be transmitted to the first support plate through the grading bracket and the second guide wheel, and the towing rope will no longer bear the downward pressure.

[0013] The present invention also provides another wing drive assembly, which includes a wing rod, a second spring, and a third guide wheel. One end of the wing rod is connected to the wing plate, and the other end is connected to the third guide wheel. The third guide wheel is aligned with the second support plate. One end of the second spring is connected to the wing rod, and the other end is connected to the grading bracket. When the towing rope moves, the entire grading unit moves horizontally along with the towing rope. When the grading unit moves to the position of the second support plate, the third guide wheel contacts the second support plate. Due to the inclination of the second support plate, the second support plate exerts a downward pressure on the third guide wheel, thereby causing the two wing plates to rotate downward, that is, the two wing plates close to each other.

[0014] Further, the grading bracket is provided with a vertically arranged mounting groove, and the central shaft is installed in the mounting groove. The specific installation height of the central shaft can be adjusted within the mounting groove.

[0015] Similarly, in order to prevent the towing rope from being subjected to a downward pressure, a horizontal support rod is provided on the grading bracket, and a fourth guide wheel aligned with the first support plate is provided on the support rod.

[0016] In the present invention, the two wing plates of the grading unit are in a herringbone shape, and the wing plates of adjacent grading units are in contact with each other. Once the initial included angle between the two wing plates in the grading unit changes, then there will be a gap between the wing plates of adjacent grading units. This means that the initial included angle of the wing plates in the grader of the present invention cannot be adjusted. However, in practical applications, there is a need to "change the initial included angle of the wing plates in the grading unit" because the initial included angle of the wing plates will affect the adjustment speed of the gap between the wing plates of subsequent adjacent grading units. The smaller the initial included angle of the wing plates, the more sensitive the change of the gap between the wing plates of subsequent adjacent grading units will be. To meet this need, the wing plates of the present invention are designed to be telescopic. Specifically, the wing plate includes a main wing plate and a secondary wing plate. Sliding grooves in the width direction are provided at both ends of the main wing plate, and the secondary wing plate is installed in the sliding grooves. The secondary wing plate is parallel and in contact with the main wing plate. Fixed holes are provided on the bottom surfaces of the main wing plate and the secondary wing plate, and wing bolts pass through the fixed holes to fix the main wing plate and the secondary wing plate.

[0017] On the premise that the wing plates are telescopic, if the initial included angle of the wing plates in the grading unit is adjusted, then by adjusting the secondary wing plate to extend the width of the entire wing plate, it is still possible to ensure that in the initial state, the wing plates of adjacent grading units are in contact with each other.

[0018] Agricultural products of different sizes will fall at the corresponding gaps between the wing plates. To achieve classified collection, the present invention further includes grading curtains and a conveyor belt. A plurality of grading curtains are arranged below the grading unit. The bottom of the grading curtain is in an A shape, and the conveyor belt is arranged below the grading curtain. The grading curtain gathers the agricultural products within a certain size range together, and the conveyor belt transports the gathered and classified agricultural products away.

[0019] When agricultural products are inevitably accumulated at the groove position between the wing plates, in order to prevent the agricultural products from being blocked between the wing plates, the present invention further includes a material pushing device. The material pushing device includes a moving shaft, a brush roller and a portal frame. The portal frame is fixed on the frame, the moving shaft is installed on the portal frame, the moving shaft is parallel to the wing plates, and the brush roller is installed on the moving shaft; the moving shaft can reciprocate along its own axial direction, thereby driving the brush roller to reciprocate along the length direction of the wing plates, so that the agricultural products are more evenly distributed between the wing plates and blockage is avoided.

[0020] A corresponding power mechanism needs to be configured for the moving shaft to make it reciprocate. The specific structure adopted in the present invention is: the material pushing device further includes a motor, an eccentric wheel and a material pushing connecting rod. The motor drives the eccentric wheel to rotate. One end of the material pushing connecting rod is hinged to the eccentric wheel, and the other end is hinged to the moving shaft.

[0021] Since the wing plates are always in a moving state, in order to prevent the brush roller from hindering the movement of the wing plates, a bearing is provided between the brush roller and the moving shaft, and the brush roller can rotate around the moving shaft.

[0022] Further, the power assembly further includes a tension pulley assembly. The traction rope is wound around the driving wheel, the driven wheel and the tension pulley. The tension pulley assembly includes a tension pulley, a tension rotating shaft, a tension rod and a third spring. The tension pulley is installed on the tension rotating shaft. One end of the tension rod is hinged to the tension rotating shaft, and the other end is inserted into the frame. The third spring is sleeved on the tension rod.

[0023] Beneficial effects: (1) The variable-gap classifier based on the wing-shaped structure of the present invention realizes the opening and closing of the wing plates through the support plate assembly and the wing driving assembly, so that the wing plates in the grading unit gradually close as they move forward, generating gaps with gradually changing sizes between the wing plates of adjacent grading units. The size of the gap is controlled by the inclination degree of the second support plate. Users can control the gap according to the requirements of the products to be graded, making the classifier have a wider application range and better grading effect. (2) The variable-gap classifier based on the wing-shaped structure of the present invention is provided with a second guide wheel or a fourth guide wheel in the wing driving assembly to transfer the pressure exerted by the second support plate on the grading unit to the first support plate to avoid deformation of the traction rope. (3) The variable-gap classifier based on the wing-shaped structure of the present invention designs the wing plates as a telescopic structure, enabling the initial included angle between the two wing plates in the grading unit to be adjustable, thereby realizing the adjustment of the sensitivity of the gap change between the wing plates of adjacent grading units. (4) The variable-gap classifier based on the wing-shaped structure of the present invention uses a rotatable brush roller to reciprocate along the length direction of the wing plates, so that the agricultural products are evenly distributed between the wing plates and prevent the agricultural products from being blocked and accumulated. Description of the Drawings

[0024] Figure 1 It is a three-dimensional view of the classifier in Embodiment 1.

[0025] Figure 2 It is the front view of the classifier in Embodiment 1.

[0026] Figure 3 It is the perspective view of the classifier in Embodiment 1 (hiding the material feeding device and part of the classification units).

[0027] Figure 4 It is the structural diagram of the towing rope, the support plate assembly and one classification unit in Embodiment 1.

[0028] Figure 5 It is the perspective view of the classification unit in Embodiment 1 (hiding part of the classification brackets).

[0029] Figure 6 It is Figure 5 the enlarged view A of

[0030] Figure 7 It is the sectional view of the classification unit in Embodiment 1.

[0031] Figure 8 The perspective view of the support plate assembly in Embodiment 1.

[0032] Figure 9 It is the perspective view of the material feeding device in Embodiment 1.

[0033] Figure 10 It is the structural diagram of the towing rope, the support plate assembly and one classification unit in Embodiment 2.

[0034] Figure 11 It is the perspective view of the classification unit in Embodiment 2.

[0035] Figure 12 It is Figure 11 the enlarged view B of

[0036] Wherein: 100, frame; 200, power assembly; 210, driving wheel; 220, driven wheel; 230, traction rope; 240, tensioning wheel assembly; 241, tensioning wheel; 242, tensioning rotating shaft; 243, tensioning rod; 244, third spring; 300, grading unit; 310, grading bracket; 311, bracket cross bar; 312, mounting groove; 313, bracket rod; 320, central shaft; 330, wing plate; 331, main wing plate; 332, secondary wing plate; 333, wing plate bolt; 340, wing driving assembly; 341, vertical pull rod; 342, connecting plate; 343, connecting rod; 344, first spring; 345, first guide wheel; 346, limit bolt; 347, second guide wheel; 3401, wing rod; 3402, second spring; 3403, third guide wheel; 3404, fourth guide wheel; 400, support plate assembly; 410, first support plate; 420, second support plate; 430, linear actuator; 500, grading curtain; 600, conveyor belt; 700, material deflecting device; 710, moving shaft; 720, brush roller; 730, portal frame; 740, motor; 750, eccentric wheel; 760, material deflecting connecting rod; 800, hopper. Detailed implementation manners

[0037] The present invention will be further described in detail below in conjunction with the specific implementation manners.

[0038] Embodiment 1

[0039] As Figures 1 to 9 shown, the variable-gap classifier based on the wing-shaped structure of this embodiment includes a frame 100, a power assembly 200, a grading unit 300, a support plate assembly 400, a grading curtain 500, a conveyor belt 600, a material deflecting device 700 and a hopper 800;

[0040] As Figure 1 and Figure 2 shown, the power assembly 200 includes a driving wheel 210, a driven wheel 220, a traction rope 230 and a tensioning wheel assembly 240. The driving wheel 210 and the driven wheel 220 are both installed on the frame 100. The tensioning wheel assembly 240 includes a tensioning wheel 241, a tensioning rotating shaft 242, a tensioning rod 243 and a third spring 244. The tensioning wheel 241 is installed on the tensioning rotating shaft 242. One end of the tensioning rod 243 is hinged to the tensioning rotating shaft 242, and the other end is inserted into the frame 100. The third spring 244 is sleeved on the tensioning rod 243. The traction rope 230 is connected end to end and wound around the driving wheel 210, the driven wheel 220 and the tensioning wheel 241. The third spring 244 drives the tensioning wheel 241 to stretch and finally tension the traction rope 230;

[0041] As Figure 8As shown, the support plate assembly 400 includes a first support plate 410, a second support plate 420, and three linear drivers 430 mounted on the frame 100. The first support plate 410 is fixed to the frame 100, the first support plate 410 is horizontal, and the first support plate 410 is located above the second support plate 420; the three linear drivers 430 are distributed along the length direction of the second support plate 420, and the telescopic rods of the three linear drivers 430 are hinged to the second support plate 420. The second support plate 420 is located below the first support plate 410 and has an angle with the first support plate 410, that is, the second support plate 420 is inclined. The linear driver 430 in this embodiment can be a cylinder, a hydraulic cylinder, or an electric push rod; as Figure 4 As shown, long round holes are provided at both ends of the second support plate 420, and the telescopic rods of the linear drivers 430 at both ends are hinged in the long round holes to ensure that the linear drivers 430 at both ends can drive the second support plate 420 to rotate without jamming;

[0042] As Figures 4 to 6 shown, the grading unit 300 includes a grading bracket 310, a central shaft 320, wing plates 330, and a wing drive assembly 340. The grading bracket 310 is fixed to the towing rope 230, the central shaft 320 is mounted on the grading bracket 310, and two wing plates 330 are hinged to the central shaft 320 in a herringbone shape; a plurality of grading units 300 are distributed along the towing rope 230 as Figure 2 shown, and the wing plates 330 of adjacent grading units 300 are in contact with each other;

[0043] The wing drive assembly 340 includes a vertical pull rod 341, a connecting plate 342, a connecting rod 343, a first spring 344, a first guide wheel 345, a limit bolt 346, and a second guide wheel 347. The grading bracket 310 is provided with a bracket cross bar 311. The vertical pull rod 341 passes through the bracket cross bar 311. The top end of the vertical pull rod 341 is fixed to the connecting plate 342. One end of the connecting rod 343 is hinged to the wing plate 330 and the other end is hinged to the connecting plate 342. The first spring 344 is sleeved on the vertical pull rod 341, and the first spring 344 is located between the connecting plate 342 and the bracket cross bar 311; a first guide wheel 345 aligned with the second support plate 420 is provided on the side of the bottom end of the vertical pull rod 341; the limit bolt 346 is mounted on the connecting plate 342, the limit bolt 346 is located above the bracket cross bar 311, and the limit bolt 346 is used to control the maximum downward distance of the vertical pull rod 341, thereby controlling the minimum included angle after the wing plates 330 are closed; a second guide wheel 347 aligned with the first support plate 410 is provided on the bottom surface of the bracket cross bar 311. When the first guide wheel 345 fits and translates along the second support plate 420, the second guide wheel 347 will also fit and translate along the first support plate 410. The aforementioned downward pressure will finally be transmitted to the first support plate 410 through the grading bracket 310 and the second guide wheel 347, and the towing rope 230 will no longer bear the downward pressure;

[0044] AsFigure 6 and Figure 7 As shown in Figure 7 , the wing plate 330 includes a main wing plate 331 and a secondary wing plate 332. Chutes in the width direction are provided at both ends of the main wing plate 331. The secondary wing plate 332 is installed in the chute. The secondary wing plate 332 is parallel to and in contact with the main wing plate 331. Fixing holes are provided on the bottom surfaces of both the main wing plate 331 and the secondary wing plate 332. The wing plate bolts 333 pass through the fixing holes to fix the main wing plate 331 and the secondary wing plate 332;

[0045] As Figure 3 shown, a plurality of grading curtains 500 are arranged below the grading unit 300. The bottom of the grading curtain 500 is in an A shape. The conveyor belt 600 is arranged below the grading curtain 500. The grading curtain 500 gathers the agricultural products within a certain size range together, and the conveyor belt 600 transports the gathered and classified agricultural products away;

[0046] As Figure 9 shown, the material pushing device 700 includes a moving shaft 710, a brush roller 720, a portal frame 730, a motor 740, an eccentric wheel 750, a material pushing connecting rod 760 and a bearing. The portal frame 730 is fixed on the frame 100. The moving shaft 710 is installed on the portal frame 730. The moving shaft 710 is parallel to the wing plate 330. The brush roller �20 is installed on the moving shaft 710. The motor 740 drives the eccentric wheel 750 to rotate. One end of the material pushing connecting rod 760 is hinged to the eccentric wheel 750, and the other end is hinged to the moving shaft 710. A bearing is provided between the brush roller 720 and the moving shaft 710. The brush roller 720 can rotate around the moving shaft 710. The moving shaft 710 can reciprocate along its own axial direction, thereby driving the brush roller 720 to reciprocate along the length direction of the wing plate 330, making the agricultural products more evenly distributed between the wing plates 330 and avoiding blockage;

[0047] The hopper 800 is located above the grading unit 300, and the agricultural products to be graded are stored in the hopper 800.

[0048] The variable-gap grading machine based on the wing-shaped structure in this embodiment is mainly used for classifying agricultural products according to size. The specific working principle is as follows:

[0049] (1) As Figure 1 and Figure 2 shown, initially, the wing plates 330 of the adjacent grading units 300 on the towing rope 230 are in contact with each other, and there is no gap between the adjacent grading units 300;

[0050] (2) After the driving wheel 210 starts, all the grading units 300 move along with the towing rope 230;

[0051] As Figures 4 to 6As shown, when the grading unit 300 moves to the position of the second support plate 420, the first guide wheel 345 contacts the second support plate 420, and the second guide wheel 347 contacts the first support plate 410; due to the inclination of the second support plate 420, the first guide wheel 345 will gradually descend when moving horizontally along the second support plate 420. As Figure 6 shown, the vertical pull rod 341 and the connecting plate 342 synchronously descend, thereby driving the connecting rod 343 to pull the wing plate 330, causing the two wing plates 330 in the grading unit 300 to close. In this way, the wing plates 330 of adjacent grading units 300 will separate and form a gap. Moreover, as the grading unit 300 advances, the descending distance of the vertical pull rod 341 increases, the closing degree of the two wing plates 330 increases, and the gap size between the wing plates 330 of adjacent grading units 300 also increases; this means that in Figure 2 the grading units 300 directly below the hopper 800 have no gap, and starting from the hopper 800 to the right, gaps gradually form between the grading units 300 and the gaps become larger and larger;

[0052] (3) When agricultural products fall from the hopper 800 into the grading unit 300 as Figure 2 shown, the agricultural products also move from left to right along with the grading unit 300. As the gap between the grading units 300 gradually increases, the smaller-sized agricultural products first fall through the gap between the grading units 300, and the larger-sized agricultural products fall later, thus realizing the size grading of the agricultural products; the graded agricultural products fall onto the conveyor belt 600 and are transported away by the conveyor belt 600.

[0053] When the agricultural products are between the grading units 300, the moving shaft 710 in the material deflecting device 700 as Figure 1 and Figure 9 shown drives the brush roller 720 to deflect the agricultural products between the grading units 300 to make them more uniform and facilitate the falling of the agricultural products of appropriate size.

[0054] From Figure 6 it can be seen that if the first spring 344 of different lengths is replaced, the initial included angle between the two wing plates 330 in the grading unit 300 can be changed. To ensure that the wing plates 330 of adjacent grading units 300 still contact each other after the initial included angle is changed, the user also needs to adjust the position of the secondary wing plate 332 as Figure 7 shown. Analyzing Figure 5 and Figure 6 it can be seen that the greater the descending distance of the vertical pull rod 341, the greater the gap generated between the wing plates 330 of adjacent grading units 300, but the two are not in a simple linear relationship; the gap size between adjacent grading units 300 is also related to the initial included angle between the two wing plates 330 in the grading unit 300, which is also the reason why the user needs to adjust the initial included angle of the wing plates 330.

[0055] Example 2

[0056] As Figures 10 to 12 shown, this embodiment is basically the same as Embodiment 1, except that in this embodiment, the grading unit 300 adopts another wing drive assembly 340, which specifically includes a wing rod 3401, a second spring 3402, a third guide wheel 3403, and a fourth guide wheel 3404. One end of the wing rod 3401 is connected to the main wing plate 331, and the other end is connected to the third guide wheel 3403. The third guide wheel 3403 is aligned with the second support plate 420. One end of the second spring 3402 is connected to the wing rod 3401, and the other end is connected to the grading bracket 310. The grading bracket 310 of the grading unit 300 is provided with a vertically oriented mounting groove 312, and the central shaft 320 is installed in the mounting groove 312. The specific installation height of the central shaft 320 can be adjusted within the mounting groove 312. A horizontal support rod 313 is provided on the grading bracket 310, and a fourth guide wheel 3404 aligned with the first support plate 410 is provided on the support rod 313.

[0057] When the towing rope 230 moves, the entire grading unit 300 moves horizontally along with the towing rope 230. When the grading unit 300 moves to the position of the second support plate 420, the third guide wheel 3403 contacts the second support plate 420, and the fourth guide wheel 3404 contacts the first support plate 410. Since the second support plate 420 is inclined, the second support plate 420 exerts a downward pressure on the third guide wheel 3403, thereby causing the two wing plates 330 to rotate downward, that is, the two wing plates 330 close together.

[0058] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. All omissions, substitutions, and changes made within the scope of the gist of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable-gap classifier based on an airfoil structure, characterized in that: It includes a frame, a power assembly, a grading unit and a support plate assembly; The power assembly includes a driving wheel, a driven wheel and two traction ropes, the driving wheel and the driven wheel are both mounted on the frame, and the two traction ropes are connected end to end and are respectively wound around the two ends of the driving wheel and the driven wheel; There are multiple grading units, each of which includes two grading brackets, a central shaft, two wing plates, and two sets of wing drive assemblies. The two grading brackets are respectively fixed on two traction ropes, the central shaft is installed between the two grading brackets, and the two wing plates are hinged on the central shaft in a herringbone shape. The multiple grading units are distributed along the traction ropes, and initially, the wing plates of adjacent grading units are in contact with each other. The support plate assembly is mounted on the frame, and the support plate assembly includes a second support plate, which is tiltedly mounted on the frame; Each set of the wing drive assembly includes a vertical pull rod, a connecting plate, two connecting rods and a first spring. The stepped bracket is provided with a bracket cross bar. The vertical pull rod passes through the bracket cross bar. The top end of the vertical pull rod is fixed with a connecting plate. One end of each connecting rod is hinged to a wing plate and the other end is hinged to the connecting plate. The first spring is sleeved on the vertical pull rod and is located between the connecting plate and the bracket cross bar. The side of the bottom end of the vertical pull rod is provided with a first guide wheel aligned with the second support plate. When the traction rope pulls the grading unit through the support plate assembly, the first guide wheel contacts the second support plate, and the first guide wheel gradually descends while moving horizontally in contact with the second support plate. The wing drive assembly drives the two wing plates to close, and the wing plates of adjacent grading units separate and create a gap.

2. The variable-gap classifier based on an airfoil structure according to claim 1, wherein: The support plate assembly also includes a first support plate, which is fixed on the frame and is located above the second support plate.

3. The variable-gap classifier based on the airfoil structure according to claim 1, wherein: The support plate assembly further comprises three linear actuators mounted on the frame, the three linear actuators being distributed along the length direction of the second support plate, and telescopic rods of the three linear actuators being hinged to the second support plate.

4. The variable-gap classifier based on the airfoil structure according to claim 1, wherein: The wing drive assembly further comprises a limiting bolt, which is mounted on the connecting plate and is located above the bracket crossbar.

5. The variable-gap classifier based on the airfoil structure according to claim 2, characterized in that: The bottom surface of the bracket cross bar is provided with a second guide wheel aligned with the first support plate.

6. The variable-gap classifier based on the airfoil structure according to claim 1, wherein: The wing plate is telescopic.

7. The variable-gap classifier based on the airfoil structure according to claim 6, characterized in that: The wing panels include main wing panels and secondary wing panels. Both ends of the main wing panels are provided with sliding grooves in the width direction. The secondary wing panels are installed in the sliding grooves. The secondary wing panels are parallel to and fit the main wing panels.

8. The variable-gap classifier based on an airfoil structure according to claim 7, characterized in that: The bottom surfaces of the main wing plate and the secondary wing plate are both provided with fixing holes, and the wing plate bolts pass through the fixing holes to fix the main wing plate and the secondary wing plate.

9. The variable-gap classifier based on an airfoil structure according to claim 1, characterized in that: The device further comprises a grading curtain, wherein a plurality of grading curtains are arranged below the grading unit.

10. The variable-gap classifier based on the airfoil structure according to claim 9, characterized in that: The bottom of the grading curtain is in an A shape.

11. The variable-gap classifier based on the airfoil structure according to claim 10, wherein: The utility model further comprises a conveyor belt, which is arranged below the grading curtain.

12. The variable-gap classifier based on the airfoil structure according to claim 1, characterized in that: It also includes a material digging device, which includes a moving shaft, a brush roller and a door frame. The door frame is fixed on the frame, the moving shaft is installed on the door frame, the moving shaft is parallel to the wing plate, and the brush roller is installed on the moving shaft.

13. The variable-gap classifier based on the airfoil structure according to claim 12, characterized in that: The material-discharging device further comprises a motor, an eccentric wheel and a material-discharging connecting rod. The motor drives the eccentric wheel to rotate. One end of the material-discharging connecting rod is hinged to the eccentric wheel, and the other end is hinged to the moving shaft.

14. The variable-gap classifier based on the airfoil structure according to claim 13, wherein: A bearing is provided between the brush roller and the movable shaft.

15. The variable-gap classifier based on the airfoil structure according to claim 1, wherein: The power assembly also includes a tensioning wheel assembly, and the traction rope is wound around the driving wheel, the driven wheel and the tensioning wheel.

16. The variable-gap classifier based on the airfoil structure according to claim 15, characterized in that: The tension pulley assembly includes a tension pulley, a tension rotating shaft, a tension rod, and a third spring. The tension pulley is mounted on the tension rotating shaft. One end of the tension rod is hinged to the tension rotating shaft, and the other end is inserted into the frame. The third spring is sleeved on the tension rod.

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