A streamlined impurity removal fan with adjustable cleaning chamber height for sugarcane harvesters

Abstract

The present invention relates to the technical field of agricultural machinery and equipment, and specifically to a streamlined impurity removal fan with an adjustable cleaning chamber height for a sugarcane harvester; the impurity removal fan provided by the present invention has a streamlined fan cover structure that eliminates the concave platform on the top, making the flow of airflow inside it smoother, eliminating the low-speed vortex area at the rear and top of the fan cover, and improving the impurity removal efficiency and quality. At the same time, the upward guide port at the fan cover outlet eliminates the original backflow phenomenon at the outlet; the blade shape of the fan impeller assembly is conducive to eliminating the flow separation phenomenon near the impeller, thereby improving the impeller efficiency; the height-adjustable cleaning chamber structure enables the sugarcane harvester to adjust the cleaning height according to the feed amount during the harvesting process, and then adjust the distance from the fan impeller to the sugarcane material throwing port, thereby reducing the impurity content and loss rate.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery and equipment, and in particular to a streamlined impurity removal fan with an adjustable cleaning chamber height for a sugarcane harvester. Background Art

[0002] Sugarcane is a major sugar crop, serving as the primary raw material for sucrose production and fuel ethanol production. Harvesting is a critical step in sugarcane production and one of the most labor-intensive processes in the industry. Promoting mechanized sugarcane harvesting, reducing farmers' labor intensity, and increasing their incomes are effective solutions to these challenges. However, currently, mechanized sugarcane harvesting suffers from high rates of trash and waste, hindering its acceptance. Therefore, improving the performance of exhaust fans and reducing these rates are urgent challenges.

[0003] The fan of the existing segmented sugarcane harvester has a large depression at the top of the fan cover where the hydraulic motor is installed, and the inner walls on both sides below the outlet have sudden changes in shape. The fan blade cross-section (airfoil) has sudden changes in shape at both the leading and trailing edges, which can easily induce flow separation on both sides of the impeller area. The short length of the cleaning chamber causes the ejection port to be close to the impeller area. During operation, the sugarcane segments often collide with the fan blades, resulting in the sugarcane segments being broken and the loss rate increasing. In addition, the connection between the square at the bottom and the circular at the top does not pass, and there is a large low-speed vortex area and bypass flow on the left. These defects make the movement of the material more chaotic and the material is discharged toward one side of the outlet, resulting in poor harvest quality. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a streamlined impurity removal fan for a sugarcane harvester with an adjustable cleaning chamber height, so as to solve the problem that the sugarcane harvester's impurity removal fan has an unreasonable structure, has many aerodynamic defects, and has a fixed distance from the impeller to the throwing port, resulting in poor harvest quality, reduce the impurity content and loss rate of the harvest, and improve the harvest quality.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A streamlined impurity removal fan with an adjustable cleaning chamber height for a sugarcane harvester, the impurity removal fan comprising a fan cover, a cleaning chamber, a height adjustment assembly, and a fan impeller assembly;

[0007] The top surface of the fan cover includes, from front to back, an upper guide plate, a front transition guide plate, a motor placement platform, a rear transition guide plate and a rear guide plate, the upper guide plate is in the shape of an upwardly protruding arc, the motor placement platform is horizontal, the front transition guide plate transitionally connects the upper guide plate and the motor placement platform, one end surface of the rear transition guide plate is connected to the motor placement platform, and the other end surface extends downward in an arc shape to be connected to the rear guide plate, the bottom surface of the fan cover includes, from front to back, an outlet lower guide plate and a lower bottom plate, the outlet lower guide plate is in the shape of an upwardly protruding arc, and the fan cover is connected to the cleaning chamber through the lower bottom plate;

[0008] The cleaning chamber includes an inner sleeve placed vertically, an outer sleeve is sleeved on the outer side of the inner sleeve and is driven by the height adjustment assembly to be raised and lowered relative to the inner sleeve, and a guide plate is provided in the inner sleeve;

[0009] The cleaning chamber further includes a chain surrounding the outer sleeve and independently arranged relative to the outer sleeve, the chain is transmission-connected to a first hydraulic motor, and the chain is fixedly connected to the lower base plate;

[0010] The fan impeller assembly includes a second hydraulic motor disposed above the fan cover, the second hydraulic motor passing through the fan cover and being transmission-connected to an impeller hub below, the impeller hub being provided with a plurality of blades arranged in a circumferential array and capable of rotating around the impeller hub in a horizontal plane under the driving action of the second hydraulic motor;

[0011] The front end surface of the impeller hub is hemispherical, and the trailing edge of the blade is formed with a rounded corner.

[0012] Furthermore, the cleaning chamber also includes a lower cone fixed below the bottom of the inner sleeve, a throwing port and a front baffle are provided on the outer side surface of the lower cone, and a throwing baffle is provided on the throwing port.

[0013] Furthermore, the pitch angle of the ejection baffle relative to the ejection port is adjustable.

[0014] Furthermore, a plurality of vertical slide rails are provided on the outside of the inner sleeve and around the inner sleeve, and a plurality of vertical slide grooves are correspondingly provided on the inside of the outer sleeve, and the positions and quantities of the slide grooves correspond to those of the slide rails.

[0015] Furthermore, the height adjustment assembly includes a lower support frame fixed to the outside of the inner sleeve, the lower support frame is provided with a hydraulic cylinder and is connected to an upper support frame through the hydraulic cylinder and can be raised and lowered relative to the lower support frame in the vertical direction, the upper support frame is fixedly connected to the outer sleeve, and a support rod is installed on the upper support frame, and the support rod is fixedly connected to the fan cover.

[0016] Furthermore, there are two lower support frames, two hydraulic cylinders, and two upper support frames respectively on the left and right sides, and there are three support rods, two of which are fixedly connected to the two upper support frames respectively, and the third support rod is fixedly connected to the outer sleeve.

[0017] Furthermore, the three support rods are commonly connected to a protective cover covering the outside of the second hydraulic motor.

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention provides a streamlined impurity removal fan for a sugarcane harvester with an adjustable cleaning chamber height. The streamlined fan cover structure eliminates the concave platform at the top, making the internal airflow flow smoother and eliminating the low-speed vortex area at the rear and top of the fan cover, thereby improving the impurity removal efficiency and quality. At the same time, the upward guide port at the fan cover outlet eliminates the original backflow phenomenon at the outlet.

[0020] (2) The blade shape of the fan impeller assembly is conducive to eliminating flow separation near the impeller and improving impeller efficiency;

[0021] (3) The height-adjustable cleaning chamber structure allows the sugarcane harvester to adjust the cleaning height according to the feed amount during the harvesting process, and then adjust the distance from the fan impeller to the sugarcane material throwing port, thereby reducing the impurity rate and loss rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 Schematic diagram of the overall structure of the impurity removal fan of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall and cross-sectional structure of the fan cover;

[0025] Figure 3 This is a schematic diagram of the overall structure of the cleaning room;

[0026] Figure 4 Schematic diagram of the connection structure between the outer sleeve and the inner sleeve;

[0027] Figure 5 is a structural diagram of a height adjustment component;

[0028] Figure 6 Schematic diagram of the structure of the fan impeller assembly;

[0029] In the figure: 1-fan cover; 2-cleaning chamber; 3-height adjustment assembly; 4-fan impeller assembly; 11-upper guide plate; 12-front transition guide plate; 13-motor placement platform; 14-rear transition guide plate; 15-rear guide plate; 16-outlet lower guide plate; 17-lower bottom plate; 21-outer sleeve; 22-inner sleeve; 23-guide plate; 24-chain; 25-first hydraulic motor; 26-ejection baffle; 27-ejection port; 28-lower cone; 29-front baffle; 211-chute; 221-slide rail; 31-support rod; 32-protective cover; 33-upper support frame; 34-hydraulic cylinder; 35-lower support frame; 41-second hydraulic motor; 42-connecting flange; 43-first transmission shaft; 44-secondary transmission shaft; 45-impeller hub; 46-blade; 47-trailing edge. DETAILED DESCRIPTION

[0030] The following describes preferred embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the following embodiments are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art may make various modifications and substitutions to the present invention without departing from the purpose and spirit of the present invention.

[0031] The streamlined impurity removal fan with an adjustable cleaning chamber height for a sugarcane harvester according to the present invention first comprises a fan cover 1, a cleaning chamber 2, a height adjustment component 3 and a fan impeller component 4.

[0032] The fan housing 1 serves as a channel for the removal of sugarcane impurities. Its top surface, from front to back, comprises an upper deflector plate 11, a front transition deflector plate 12, a motor platform 13, a rear transition deflector plate 14, and a rear deflector plate 15. Specifically, the upper deflector plate 11 is shaped like an upwardly convex arc, eliminating the low-speed vortex zone that forms at the top of the fan housing 1 and preventing excessively low airflow velocities. The motor platform 13 is horizontal and connected to the upper deflector plate 11 via the concave front transition deflector plate 12. It then connects to the rear transition deflector plate 14, also shaped like an upwardly convex arc. This eliminates the original motor-mounted recessed platform and allows airflow to follow the shape of the fan housing 1, effectively eliminating flow separation and improving the removal trajectory of sugarcane impurities. The rear transition deflector plate 14 is connected to the motor platform 13 on one end and to the rear deflector plate 15 on the other.

[0033] The bottom surface of the fan cover 1 includes an outlet lower guide plate 16 and a lower bottom plate 17 from front to back, wherein the outlet lower guide plate 16 is in an upwardly convex arc shape, and its structural design of contracting into the fan cover 1 can eliminate the backflow phenomenon below the outlet of the fan cover 1.

[0034] The cleaning chamber 2 is where sugarcane leaves are separated. After being cut into segments, the sugarcane enters the cleaning chamber 2 for separation. The separated sugarcane leaves are discharged from the fan cover 1, and the sugarcane segments fall from the bottom of the cleaning chamber 2. Specifically, the cleaning chamber 2 includes a vertically arranged inner sleeve 22. An outer sleeve 21 is mounted on the outer surface of the inner sleeve 22, which is driven by a height adjustment assembly 3 to move up and down relative to the inner sleeve 22. A guide plate 23 is installed inside the inner sleeve 22.

[0035] Specifically, a plurality of vertical slide rails 221 (six in this embodiment) are provided around the inner sleeve 22. Six corresponding vertical slide grooves 211 are provided inside the outer sleeve 21. The six slide grooves 211 correspond to the positions of the six slide rails 221. Thus, when the slide grooves 211 slide on the slide rails 221, the outer sleeve 21 can be raised or lowered relative to the inner sleeve 22.

[0036] The cleaning chamber 2 also includes a chain 24 that surrounds the outer sleeve 21 and is independently arranged relative to the outer sleeve 21. The chain 24 is also connected to the first hydraulic motor 25. The chain 24 is also fixedly connected to the lower base plate 17 of the fan cover 1. Therefore, the chain 24 can be driven by the first hydraulic motor 25 to rotate, thereby realizing the horizontal rotation of the fan cover 1, thereby adjusting the discharge direction of sugarcane impurities.

[0037] The cleaning chamber 2 also includes a lower cone 28 fixed below the bottom of the inner sleeve 22. A throwing port 27 and a front baffle 29 are provided on the outer surface of the lower cone 28. The throwing port 27 is also provided with a throwing baffle 26 with an adjustable pitch angle. The adjustable range is 0 to 45 degrees, thereby adjusting the angle of the sugarcane material entering the cleaning chamber 2 from the throwing port 27 to prevent the sugarcane material from running too high and colliding with the fan impeller assembly 4.

[0038] The height adjustment assembly 3 includes two left and right lower support frames 35 fixed to the outside of the inner sleeve 22. A hydraulic cylinder 34 is provided on each of the two lower support frames 35, and an upper support frame 33 is connected to the outer sleeve 21 through the hydraulic cylinder 34, which can be raised and lowered relative to the lower support frame 35 in the vertical direction. The upper support frame 33 is fixedly connected to the outer sleeve 21, and a support rod 31 is installed on the upper support frame 33. In this embodiment, in addition to the support rods 31 connected to the two upper support frames 33, the outer sleeve 21 is also separately connected to a support rod 31. The three support rods 32 converge together to the top of the fan cover 1 and are connected to a protective cover 32, which is also fixedly connected to the top of the fan cover 1.

[0039] When actually adjusting the height of the cleaning chamber 2, the front end of the ejection port 27 is connected to the sugarcane harvester elevator, so the lower cone 28 and the inner sleeve 22 are fixed, and the hydraulic cylinder 34 is extended and retracted to drive the upper support frame 33, and then drive the outer sleeve 21 to rise and fall, so as to adjust the height of the cleaning chamber 2.

[0040] In this embodiment, the height adjustment scheme of the cleaning chamber 2 is:

[0041] During harvesting, the sugarcane harvester feeds a small amount of sugarcane mixture, resulting in a more dispersed sugarcane during throwing. Cleaning can be completed in a very short time, and the height of the cleaning chamber 2 does not need to be very high. In this case, the hydraulic cylinder 34 contracts to shorten the length of the cleaning chamber 2. When the feed is large, the sugarcane mixture is high, and sugarcane leaves and segments tend to clump and be thrown out, making cleaning difficult. Therefore, a longer cleaning time is required. In this case, the hydraulic cylinder 34 extends to raise the height of the cleaning chamber 2.

[0042] The fan impeller assembly 4 includes a second hydraulic motor 41 disposed above the fan housing 1 and within the protective housing 32. The second hydraulic motor 41 extends through the fan housing 1 and is connected to a connecting flange 42 below. This is then sequentially connected to a primary drive shaft 43, a secondary drive shaft 44, and an impeller hub 45. The impeller hub 45 is provided with a plurality of blades 46 (three in this embodiment) arranged in a circular array and capable of rotating about the impeller hub 45 in a horizontal plane by the drive action of the second hydraulic motor 41. The front end of the impeller hub 45 is hemispherical, providing improved aerodynamic performance and facilitating installation. The three blades 45 are of equal width and have rounded corners at their trailing edges 47, which help eliminate flow separation and improve the operating efficiency of the impeller.

Claims

1. A streamlined impurity removal fan with an adjustable cleaning chamber height for a sugarcane harvester, characterized in that: The impurity removal fan includes a fan cover, a cleaning chamber, a height adjustment component and a fan impeller component; The top surface of the fan cover includes, from front to back, an upper guide plate, a front transition guide plate, a motor placement platform, a rear transition guide plate and a rear guide plate, the upper guide plate is in the shape of an upwardly protruding arc, the motor placement platform is horizontal, the front transition guide plate transitionally connects the upper guide plate and the motor placement platform, one end surface of the rear transition guide plate is connected to the motor placement platform, and the other end surface extends downward in an arc shape to be connected to the rear guide plate, the bottom surface of the fan cover includes, from front to back, an outlet lower guide plate and a lower bottom plate, the outlet lower guide plate is in the shape of an upwardly protruding arc, and the fan cover is connected to the cleaning chamber through the lower bottom plate; The cleaning chamber includes an inner sleeve placed vertically, an outer sleeve is sleeved on the outer side of the inner sleeve and is driven by the height adjustment assembly to be raised and lowered relative to the inner sleeve, and a guide plate is provided in the inner sleeve; The cleaning chamber further includes a chain surrounding the outer sleeve and independently arranged relative to the outer sleeve, the chain is transmission-connected to a first hydraulic motor, and the chain is fixedly connected to the lower base plate; The fan impeller assembly includes a second hydraulic motor disposed above the fan cover, the second hydraulic motor passing through the fan cover and being transmission-connected to an impeller hub below, the impeller hub being provided with a plurality of blades arranged in a circumferential array and capable of rotating around the impeller hub in a horizontal plane under the driving action of the second hydraulic motor; The front end surface of the impeller hub is hemispherical, and the trailing edge of the blade is formed with a rounded corner.

2. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 1, characterized in that: The cleaning chamber further comprises a lower cone fixed below the bottom of the inner sleeve, a throwing port and a front baffle are provided on the outer side of the lower cone, and a throwing baffle is provided on the throwing port.

3. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 2, characterized in that: The pitch angle of the ejection baffle relative to the ejection port is adjustable.

4. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 1, characterized in that: A plurality of vertical slide rails are provided on the outside of the inner sleeve and around the inner sleeve, and a plurality of vertical slide grooves are provided on the inside of the outer sleeve. The positions and quantities of the slide grooves correspond to those of the slide rails.

5. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 1, characterized in that: The height adjustment assembly includes a lower support frame fixed to the outside of the inner sleeve, a hydraulic cylinder is provided on the lower support frame and is connected to an upper support frame which can be raised and lowered relative to the lower support frame in a vertical direction through the hydraulic cylinder, the upper support frame is fixedly connected to the outer sleeve, a support rod is installed on the upper support frame, and the support rod is fixedly connected to the fan cover.

6. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 5, characterized in that: The lower support frame, the hydraulic cylinder, and the upper support frame are respectively provided with two on the left and right sides, and there are three support rods, two of which are fixedly connected to the two upper support frames respectively, and the third support rod is fixedly connected to the outer sleeve.

7. The streamlined impurity removal fan with adjustable cleaning chamber height for a sugarcane harvester according to claim 6, characterized in that: The three support rods are commonly connected to a protective cover covering the outside of the second hydraulic motor.

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