Impurity removal device for cotton picker

Abstract

The invention belongs to the field of cotton picking, and particularly discloses an impurity removing device for a cotton picker, the impurity removing device comprises an impurity filtering device, a first-stage impurity removing device, a second-stage impurity removing device and a third-stage impurity removing device which are mounted in a cotton collecting box, and the impurity filtering device is mounted at a cotton inlet of the cotton collecting box; the first-stage impurity removal device is installed at the top of the cotton collecting box, the second-stage impurity removal devices are arranged in the cotton collecting box, the multiple second-stage impurity removal devices are obliquely arranged in the cotton collecting box, and the cotton discharging roller is installed above the second-stage impurity removal devices and can perform fixed-axis rotation to perform forced cotton discharging; and the third-stage impurity removal device is mounted at a cotton outlet of the cotton conveying and collecting box.

Description

Technical Field

[0001] The invention belongs to the field of cotton picking, and in particular relates to an impurity removing device for a cotton picker. Background Art

[0002] After the seed cotton is mechanically picked and compressed and baled, it enters the cotton processing plant. Due to the high impurity content, a special seed cotton cleaning machine will be used to continue to clean the impurities. However, the compression of the baling causes the adhesion between impurities such as cotton leaves, cotton stalks, and boll shells and the cotton fibers to increase, making subsequent cleaning more difficult. Not only is the cleaning efficiency low, it is time-consuming and labor-intensive, and the cost is extremely high. Therefore, from the time the seed cotton is picked to before it is baled, the seed cotton should be cleaned to reduce the impurity content.

[0003] Patent CN110340016A discloses an impurity separation device for producing cotton thread, including a shell, a impurity separation chamber is provided in the shell, a blower mechanism is provided on the upper end surface of the shell, a first screening plate and a second screening plate are provided in the shell, one end of the first screening plate is fixedly connected to one side wall of the impurity separation chamber, the other end of the first screening plate is fixedly connected to the other side wall of the impurity separation chamber, a first vibration motor is fixedly installed on the bottom side wall of the first screening plate, and one end of the second screening plate is fixedly connected to one side wall of the impurity separation chamber; however, the structure has the following problems:

[0004] (1) In this structural form, in addition to the vibration of the support seat being weakened by the buffer spring, the main body of the entire impurity separation device will vibrate under the action of the vibration motor, which will consume more energy and have a limited vibration effect.

[0005] (2) The working principle and working process of the impurity separation device assume that the cotton entering the device is independent of each other and can pass through the pores of the screening plate. However, for actual cotton, there will be adhesion between each other, causing the cotton to become a clumping aggregate. Therefore, in actual work, the cotton may not be able to pass through the pores of the screening plate, but will be crowded on the upper surface of the screening plate, and the impurity removal effect cannot be achieved.

[0006] (3) In the impurity separation chamber of the impurity separation device, it is indeed possible to separate larger impurities such as mud and stones from cotton. However, when the impurities are of similar size to the cotton, they will pass through the bottom of the first screening plate together with the cotton to the top of the second screening plate. The aperture of the second screening plate is smaller than that of the first screening plate. The cotton cannot pass through, and impurities of similar size to the cotton will also be unable to pass through. Ultimately, impurities will still be present in the cotton discharged from the second discharge port, and the impurity removal effect is poor.

[0007] (4) The impurity separation device can remove impurities on the surface of cotton through a blower, and can remove some impurities mixed with cotton through a screening plate, but it still cannot remove impurities inside the cotton.

[0008] (5) The structure of the impurity separation device is fixed and cannot be adjusted. Summary of the invention

[0009] The object of the present invention is to provide an impurity removal device for a cotton picker to solve the problem of high impurity content of seed cotton during round mold packaging after harvesting. The present invention fundamentally reduces the impurity content of seed cotton through a clever combination of a primary impurity removal device, a secondary impurity removal device and a tertiary impurity removal device, thereby saving a lot of time and manpower for subsequent seed cotton cleaning, reducing costs, and being beneficial to the later processing and application of seed cotton.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A debris removal device for a cotton picker, characterized in that it comprises a debris filtering device, a primary debris removal device, a secondary debris removal device and a tertiary debris removal device installed in a cotton collecting box, wherein the debris filtering device is installed at the cotton inlet of the cotton collecting box; the primary debris removal device is installed on the top of the cotton collecting box, and the secondary debris removal device is arranged in the cotton collecting box. A plurality of secondary debris removal devices are provided, and the plurality of secondary debris removal devices are arranged obliquely inside the cotton collecting box; a cotton discharge roller is installed above the secondary debris removal device and can rotate on a fixed axis to force cotton discharge; the tertiary debris removal device is installed at the cotton outlet of the cotton collecting box.

[0012] As a further technical solution, the secondary impurity removal device is composed of a screen, a screen frame, a vibrator, a base, a shock-absorbing spring, a rotating shaft, and a pressure sensor; the screen is fixedly mounted on the upper surface of the screen frame, and the vibrator is fixedly mounted on the lower surface of the screen frame; the screen frame and the base are connected via a shock-absorbing spring; the rotating shaft is fixedly mounted on one side of the base, and the rotating shaft is fixedly mounted on the box walls on both sides of the cotton picker via a bearing, which can drive the secondary impurity removal device to realize fixed-axis rotation; the pressure sensor is fixedly mounted inside the secondary impurity removal device, and is used to detect the pressure of the screen and the seed cotton.

[0013] As a further technical solution, the rotating shafts of the multiple secondary impurity removal devices are driven by the same motor, and the motor drives the rotating shafts of the multiple secondary impurity removal devices simultaneously through a gear transmission device.

[0014] As a further technical solution, the bottom surface of the substrate is internally inclined so that impurities can gather in one place.

[0015] As a further technical solution, the impurities collected by the filtering device and the secondary impurity removing device are connected through a hose and directly discharged out of the machine body.

[0016] As a further technical solution, a plurality of the damping springs are provided.

[0017] As a further technical solution, small cylindrical bosses are provided inside the lower surface of the screen frame and the bottom surface of the base to provide locations for the fixed installation of the shock-absorbing spring.

[0018] As a further technical solution, the first-level impurity removal device consists of an impurity removal fan and an arc-shaped filter plate. The impurity removal fan is arranged and installed on the top of the cotton collecting box along the width direction of the cotton picker. Each of the impurity removal fans corresponds to one of the cotton conveying channels. The arc-shaped filter plate is evenly distributed with small holes.

[0019] As a further technical solution, the upper surface of the filtering device is evenly distributed with small holes, and the inner bottom surface of the filtering device is inclined.

[0020] As a further technical solution, the three-stage impurity removal device consists of an impurity removal fan, an impurity discharge trough and an impurity discharge pipe; the impurity removal fan is located below the cotton conveyor belt, the bottom of the impurity discharge trough is inclined, and the impurity discharge pipe is connected at the lowest point.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention arranges a primary impurity removal device above the cotton collecting box, uses a fan to form suction to collect impurities, and blocks the seed cotton outside through an arc filter plate, which can effectively remove impurities on the surface of the seed cotton and discharge them out of the machine body to initially reduce the impurity content of the seed cotton; the impurities inside the seed cotton are turned to the surface by the squeezing and kneading action of the spiked roller, and a secondary impurity removal device is installed inside the cotton collecting box, and the impurities of the seed cotton are further cleaned under the action of vibration. At the same time, the secondary impurity removal device is arranged obliquely inside the cotton collecting box, so that the flow of the seed cotton in the cotton collecting box is S-shaped to increase the impurity removal path, and the impurity cleaning is more thorough. The cotton is forced to be discharged by the cotton discharge roller, and the pressure sensor is used to detect whether the seed cotton inside the cotton collecting box is congested. If congestion occurs, the inclination angle of the secondary impurity removal device can be automatically adjusted to speed up the flow of the seed cotton, and the control of the stepper motor is realized by the controller of the cotton picker itself, without the need for an additional controller. After passing through the primary impurity removal device and the secondary impurity removal device, a small amount of impurities are cleaned up by the tertiary impurity removal device, making the impurity removal more thorough, further reducing the impurity content of the seed cotton, improving the utilization rate of the seed cotton, saving a lot of time and manpower for cleaning the seed cotton, reducing costs, and facilitating the later processing and application of the seed cotton.

[0023] 2. In the secondary impurity removal device of the present invention, the vibration source is installed at the bottom of the screen frame, and the connection between the screen frame and the base only relies on a plurality of damping springs. In this way, when the vibration source is working, the vibration will only be transmitted to the screen frame 14 and the screen, and will not cause a large vibration to the base, which is conducive to saving energy and achieving a better vibration effect. In the present invention, it is not cotton but impurities that pass through the screen surface. While the cotton vibrates on the screen surface, it will continue to move downward due to the inclination of the screen surface, thereby realizing the continuous transportation of the cotton, and the impurities are collected by the secondary impurity removal device while vibrating, and do not share a channel with the cotton, so that the impurity removal can be ensured to be more thorough.

[0024] 3. The spike roller added to the secondary impurity removal device of the present invention will produce a squeezing and kneading effect on the seed cotton ball, so that the impurities inside the cotton can reach the surface and be further removed.

[0025] 4. The inclination angle of the secondary impurity removal device in the present invention is adjustable. The pressure between the seed cotton and the screen surface is checked by the pressure sensor to determine whether congestion occurs. If congestion occurs, the stepper motor is driven to rotate to increase the inclination angle of the screen surface, which is conducive to the rapid discharge of cotton.

[0026] 5. The present invention changes the flow direction of the seed cotton into an S-shape, thereby increasing the movement path of the seed cotton, thereby enabling the seed cotton to pass through more secondary impurity removal devices, and the impurities are removed more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 The present invention is a schematic front view of the impurity removal device for a cotton picker.

[0029] Figure 2 The present invention is a schematic structural diagram of a secondary impurity removal device of an impurity removal device for a cotton picker.

[0030] Figure 3 The present invention is a schematic diagram of power transmission of a secondary impurity removal device of an impurity removal device for a cotton picker.

[0031] Figure 4 The present invention is a schematic diagram of the connection between the impurity discharge hose of the impurity removal device of the cotton picker and the secondary impurity removal device and the impurity flow direction.

[0032] Figure 5 The present invention is a schematic diagram of the structure of a three-stage impurity removal device of an impurity removal device for a cotton picker.

[0033] Figure 6 The present invention is a flow chart of the inclination control of the secondary impurity removal device of the impurity removal device of the cotton picker.

[0034] Figures 1 to 6 In the figure: 1 is a secondary impurity removal device, 2 is a filter device, 3 is a cotton collecting box, 4 is a spike roller, 5 is a primary impurity removal device, 52 is an arc filter plate, 51 is an impurity removal fan, 6 is a cotton discharge roller, 7 is a tertiary impurity removal device, 71 is an impurity removal fan, 72 is an impurity discharge trough, 73 is an impurity discharge pipeline, 8 is a cotton conveying belt assembly, 9 is an opening roller, 10 is an impurity discharge hose; 11 is a base, 12 is a rotating shaft, 13 is a shock-absorbing spring, 14 is a screen frame, 15 is a vibrator, 16 is a pressure sensor, and 17 is a screen. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0037] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0038] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present invention proposes a de-impurity device for a cotton picker.

[0040] In a typical embodiment of the present invention, Figure 1As shown, the embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0041] like Figure 1-Figure 6 As shown, the impurity removal device for a cotton picker disclosed in this embodiment includes an impurity filtering device 2, a primary impurity removal device 5, a secondary impurity removal device 1 and a tertiary impurity removal device 7 installed in a cotton collecting box 3, wherein the impurity filtering device 2 is installed at the cotton inlet of the cotton collecting box 3; the primary impurity removal device 5 is installed on the top of the cotton collecting box 3, the secondary impurity removal device 1 is arranged in the cotton collecting box 3, a plurality of secondary impurity removal devices 1 are arranged, and a plurality of secondary impurity removal devices 1 are arranged obliquely inside the cotton collecting box 3, a cotton discharge roller is installed above the secondary impurity removal device 1, and can rotate with a fixed axis to force cotton discharge; the tertiary impurity removal device 7 is installed at the cotton outlet of the cotton collecting box 3. The present invention fundamentally reduces the impurity content of seed cotton through the ingenious combination of the impurity filtering device, the primary impurity removal device, the secondary impurity removal device and the tertiary impurity removal device, saves a lot of time and manpower for subsequent seed cotton cleaning, reduces costs, and is conducive to the processing and application of seed cotton in the later stage.

[0042] Specifically, the thorn roller 4 is arranged at the cotton inlet of the cotton collecting box, the thorn roller 4 can rotate on a fixed axis, and the impurity filtering device 2 is installed below the thorn roller 4; the function of the thorn roller 4 is mainly to squeeze and rub the seed cotton; the upper surface of the impurity filtering device 2 is evenly distributed with small holes, which play a role in filtering impurities and blocking the seed cotton from entering, and the inner bottom surface of the impurity filtering device 2 is inclined, so that the impurities entering the impurity filtering device 2 can be gathered in one place for easy discharge; that is, the additional thorn roller 4 will produce an extrusion and rubbing effect on the seed cotton ball, so that the impurities inside the cotton can reach the surface and be further removed.

[0043] Furthermore, the primary impurity removal device 5 is composed of an impurity removal fan 51 and an arc-shaped filter plate 52. The impurity removal fan 51 is arranged and installed on the top of the cotton collecting box 3 along the width direction of the cotton picker, and each impurity removal fan 51 corresponds to a cotton conveying channel 4. Before the seed cotton sent from the cotton conveying channel falls into the cotton collecting box 3, it will be squeezed and kneaded by the spike roller 4. The impurities on the upper side of the seed cotton will be sucked into the impurity removal fan through the arc-shaped filter plate 52 due to the negative pressure suction of the impurity removal fan 51, and then collected or directly discharged from the machine body. The impurities on the lower side of the seed cotton will fall into the impurity filtering device 2, so that the impurities are separated from the seed cotton.

[0044] Furthermore, the arc filter plate 52 is evenly distributed with small holes, which can be of any shape, and impurities in the seed cotton can pass through, while the seed cotton will be blocked. Eventually, the seed cotton will fall into the cotton collecting box due to gravity, thereby playing a role in removing impurities.

[0045] Furthermore, the secondary impurity removal device 1 is arranged obliquely inside the cotton collecting box 3, so that the flow of the seed cotton in the cotton collecting box 3 is S-shaped to increase the impurity removal path, and the cotton discharge roller 6 is installed above the secondary impurity removal device 1, and can rotate on a fixed axis to force the cotton to be discharged, thereby preventing the seed cotton from being blocked inside the cotton collecting box 3; in the present embodiment, in order to make the flow of the seed cotton in the cotton collecting box 3 be S-shaped, the secondary impurity removal device 1 includes three, and the three secondary impurity removal devices 1 are alternately and obliquely arranged on the inner wall of the cotton collecting box 3. Of course, it is not difficult to understand that four, five, etc. can also be set according to needs.

[0046] Specifically, Figure 2 , Figure 3 As shown, each secondary impurity removal device 1 in this embodiment is composed of a screen 17, a screen frame 14, a vibrator 15, a base 11, a shock-absorbing spring 13, a rotating shaft 12, and a pressure sensor 16; the screen 17 is evenly distributed with small holes, which can be of any shape and fixedly mounted on the upper surface of the screen frame 14, and the vibrator 15 is fixedly mounted on the lower surface of the screen frame 14, one on each side. The vibrator 14 can be a vibration motor or a vibration motor. The screen frame 14 is connected to the base 11 through four shock-absorbing springs 13, and there are cylindrical small bosses inside the lower surface of the screen frame 14 and the bottom surface of the base 11 to provide a position for the fixed installation of the shock-absorbing spring 13; a rotating shaft 12 is fixedly mounted on one side of the base 11, and the rotating shaft 12 is fixedly mounted on the box wall on both sides of the cotton picker through a bearing fixed axis, which can drive the secondary impurity removal device 1 to realize fixed axis rotation, and the bottom surface of the base 11 is tilted inside, so that the impurities can be gathered in one place for easy discharge. The impurities collected by the secondary impurity removal device 1 are connected through a discharge hose 10 and directly discharged out of the machine body. The pressure sensor 16 is fixedly installed inside the secondary impurity removal device 1, and is used to detect the pressure between the screen 17 and the seed cotton, to ensure that the seed cotton in the cotton collecting box 3 is not blocked. In the present invention, the vibration source is installed at the bottom of the screen frame 14, and the connection between the screen frame 14 and the base 11 only relies on 4 damping springs. In this way, when the vibration source is working, the vibration will only be transmitted to the screen frame 14 and the screen 17, and will not cause a large vibration to the base 11, which is conducive to saving energy and can also achieve a better vibration effect.

[0047] Furthermore, in order to adjust the inclination angle of the secondary impurity removal device 1, a gear is connected to the end of the rotating shaft 12 of the secondary impurity removal device 1, and the power branch of the stepper motor is transmitted to each secondary impurity removal device 1 through gear transmission. When the pressure detected by the pressure sensor 16 is too high, the stepper motor starts and rotates forward, increasing the inclination angle of the secondary impurity removal device 1 so that the seed cotton can flow more quickly in the cotton collection box 3. When the pressure detected by the pressure sensor 16 returns to normal, the stepper motor starts and reverses to the initial position until the next time the pressure detected by the pressure sensor 16 is too high. The stepper motor is controlled by the controller of the cotton picker itself. In the present invention, the inclination angle of the secondary impurity removal device is adjustable, and the pressure between the seed cotton and the screen surface is checked according to the pressure sensor to determine whether congestion is caused. If congestion is caused, the stepper motor drives the rotation to increase the inclination angle of the screen surface, which is conducive to the rapid discharge of cotton.

[0048] like Figure 3 As shown, the three secondary impurity removal devices 1 in this embodiment are driven by the same stepper motor. Specifically, the stepper motor shaft transmits power to the stepper motor shaft output gear through a coupling, and transmits it to the first transmission gear, the second transmission gear and the third transmission gear through gear meshing respectively. The three transmission gears correspond to the rotating shafts 12 of the three secondary impurity removal devices 1. Since the rotation direction of the second transmission gear needs to be opposite to that of the first transmission gear and the third transmission gear, an idler gear needs to be installed to change the rotation direction.

[0049] Furthermore, the opening rollers 9 are dispersedly installed at the bottom of the cotton collecting box 3. Before the seed cotton is fed into the cotton feeding belt assembly 8, the opening rollers 9 can loosen the compressed and entangled seed cotton, thereby kneading the cotton. The impurities inside the seed cotton ball will come to the outside of the seed cotton ball, preparing for the third-level impurity removal.

[0050] Furthermore, the cotton conveying belt assembly 8 is located at the front end of the bottom of the baling bin, and includes a cotton conveying belt, which is composed of a filtering grid. The seed cotton loosened by the opening roller 9 falls onto the cotton conveying belt assembly 8.

[0051] Furthermore, the three-stage impurity removal device 9 is installed below the cotton conveying belt assembly 8, and the three-stage impurity removal device 9 is composed of an impurity removal fan 71, an impurity discharge groove 72 and an impurity discharge pipe 73. When the seed cotton falls onto the cotton conveying belt assembly 8 and starts to be fed from front to back, the impurity removal fan 71 is started to form a negative pressure suction force, and the impurities that have not been removed by the first-stage impurity removal device 5 and the second-stage impurity removal device 1 pass through the filter grid structure of the cotton conveying belt, are sucked into the air inlet of the impurity removal fan 71, and are discharged through the air outlet. The bottom of the impurity discharge groove 72 of the three-stage impurity removal device 9 is designed to be an inclined structure, and the impurity discharge pipe 73 is connected at the lowest point. The impurities discharged through the air outlet are discharged out of the machine body through the impurity discharge pipe 73.

[0052] Furthermore, the impurity removal fan 51 of the primary impurity removal device 5 and the impurity removal fan 71 of the tertiary impurity removal device 9 have the same structure.

[0053] Furthermore, the cotton conveying belt assembly 8 continuously feeds the cleaned seed cotton into the packing device in the packing bin to pack the seed cotton.

[0054] In the present invention, it is not cotton but impurities that pass through the screen surface. When the cotton vibrates on the screen surface, it will continuously move downward due to the inclination of the screen surface, thereby realizing continuous transportation of the cotton, and the impurities are collected by the secondary impurity removal device while vibrating, and do not share a channel with the cotton, thus ensuring more thorough impurity removal. The present invention changes the flow direction of the seed cotton into an S-shape, increases the movement path of the seed cotton, and thus enables the seed cotton to pass through more secondary impurity removal devices, and the impurities are removed more thoroughly.

[0055] The present invention arranges a primary impurity removal device above the cotton collecting box, uses a fan to form suction to collect impurities, and blocks the seed cotton outside through an arc filter plate, which can effectively remove impurities on the surface of the seed cotton and discharge them out of the machine body to initially reduce the impurity content of the seed cotton; the impurities inside the seed cotton are turned to the surface by the squeezing and kneading action of the spike roller, and a secondary impurity removal device is installed inside the cotton collecting box, and the impurities of the seed cotton are further cleaned under the action of vibration. At the same time, the secondary impurity removal device is arranged obliquely inside the cotton collecting box, so that the flow of the seed cotton in the cotton collecting box is S-shaped to increase the impurity removal path, and the impurity cleaning is more thorough. The cotton is forced to be discharged by the cotton discharge roller, and the pressure sensor is used to detect whether the seed cotton inside the cotton collecting box is congested. If congestion occurs, the inclination angle of the secondary impurity removal device can be automatically adjusted to speed up the flow of the seed cotton, and the control of the stepper motor is realized by the controller of the cotton picker itself, without the need for an additional controller. After passing through the primary impurity removal device and the secondary impurity removal device, a small amount of impurities are cleaned up by the tertiary impurity removal device, making the impurity removal more thorough, further reducing the impurity content of the seed cotton, improving the utilization rate of the seed cotton, saving a lot of time and manpower for cleaning the seed cotton, reducing costs, and facilitating the later processing and application of the seed cotton.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cleaning device for a cotton picker, characterized in that: It comprises a debris filtering device, a primary debris removing device, a secondary debris removing device and a tertiary debris removing device installed in a cotton collecting box. The debris filtering device is installed at the cotton inlet of the cotton collecting box; the primary debris removing device is installed on the top of the cotton collecting box, and the secondary debris removing device is arranged in the cotton collecting box. A plurality of secondary debris removing devices are arranged, and the plurality of secondary debris removing devices are arranged obliquely inside the cotton collecting box. A cotton discharging roller is installed above the secondary debris removing device and can rotate on a fixed axis to force cotton discharging; the tertiary debris removing device is installed at the cotton outlet of the cotton feeding and collecting box.

2. The impurity removal device for a cotton picker according to claim 1, characterized in that: The secondary impurity removal device is composed of a screen, a screen frame, a vibrator, a base, a shock-absorbing spring, a rotating shaft, and a pressure sensor; the screen is fixedly mounted on the upper surface of the screen frame, and the vibrator is fixedly mounted on the lower surface of the screen frame; the screen frame and the base are connected via a shock-absorbing spring; the rotating shaft is fixedly mounted on one side of the base, and the rotating shaft is fixedly mounted on the box walls on both sides of the cotton picker via a bearing, and can drive the secondary impurity removal device to realize fixed-axis rotation; the pressure sensor is fixedly mounted inside the secondary impurity removal device, and is used to detect the pressure of the screen and the seed cotton.

3. The impurity removal device for a cotton picker according to claim 2, characterized in that: The rotating shafts of the multiple secondary impurity removal devices are driven by the same motor, and the motor drives the rotating shafts of the multiple secondary impurity removal devices simultaneously through a gear transmission device.

4. The impurity removal device for a cotton picker according to claim 2, characterized in that: The bottom surface of the substrate is internally inclined so that impurities can gather in one place.

5. The impurity removal device for a cotton picker according to claim 2, characterized in that: The impurities collected by the impurity filtering device and the secondary impurity removing device are connected through a hose and directly discharged out of the machine body.

6. The impurity removal device for a cotton picker according to claim 2, characterized in that: The damping springs are arranged in plurality.

7. The impurity removal device for a cotton picker according to claim 4, characterized in that: The lower surface of the screen frame and the bottom surface of the base body are both provided with small cylindrical bosses to provide positions for the fixed installation of the shock-absorbing spring.

8. The impurity removal device for a cotton picker according to claim 1, characterized in that: The primary impurity removal device is composed of an impurity removal fan and an arc-shaped filter plate. The impurity removal fan is arranged and installed on the top of the cotton collecting box along the width direction of the cotton picker, and each impurity removal fan corresponds to one of the cotton conveying channels. The arc-shaped filter plate is evenly distributed with small holes.

9. The impurity removal device for a cotton picker according to claim 2, characterized in that: The upper surface of the impurity filtering device is evenly distributed with small holes, and the inner bottom surface of the impurity filtering device is inclined.

10. The impurity removal device for a cotton picker according to claim 2, characterized in that: The three-stage impurity removal device is composed of an impurity removal fan, an impurity discharge trough and an impurity discharge pipeline; the impurity removal fan is located below the cotton conveying belt, the bottom of the impurity discharge trough is inclined, and the impurity discharge pipeline is connected at the lowest point.

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