Secondary cleaning system of peanut picking machine, dust removal device and peanut picking machine

Abstract

The present invention relates to a secondary cleaning system of a peanut picker, comprising a vibrating screen (17), a first cleaning fan (18), a second cleaning fan (15) and a waste elevator (16). The vibrating screen is arranged obliquely at the lower part of a straw chopper (2) of the peanut picker, the lower head end of the vibrating screen is provided with a first cleaning fan, the lower end is provided with a second cleaning fan and a waste elevator, and the air outlet of the second cleaning fan is provided at the end of the waste elevator away from the first cleaning fan. The present invention also provides a dust removal device and a peanut picker. The present invention adds a second cleaning fan to increase the wind force of cleaning, prevents straw and peanuts from falling into the waste agitator, and prevents the entire cleaning system from being blocked; a water tank is added at the lower part of the straw box, and the water tank also serves as a hand washing water tank, which is convenient for the operator to use; in addition, a high-pressure water pump and an accumulator are provided in the water tank, and a high-pressure water mist is sprayed out through a water mist nozzle to reduce dust.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural product harvesting, and in particular relates to a secondary cleaning system of a peanut picker, a dust removal device and the peanut picker. Background Art

[0002] With the continuous advancement of science and technology, people's peanut harvesting methods have also developed from traditional manual operations to mechanical automation, and peanut picking machines have come into being. Peanut picking machines are harvesting machines that complete the functions of picking, picking, cleaning and collecting peanut straw during the peanut harvesting process. Traditional peanut picking machines have wear on the impeller of the grass discharge fan and insufficient air suction, and are unable to deliver the straw by wind. The heavier straw falls into the debris elevator on the lower side of the grass discharge fan, causing the debris elevator to be blocked, or re-enters the picking room through the side conveyor belt, and is cleaned again by the cleaning fan, but the straw is heavier and finally falls into the fruit delivery auger, causing the fruit delivery auger to be blocked, or enters the fruit delivery fan through the fruit delivery auger, and finally enters the fruit box. The harvested peanuts contain a lot of straw, and the peanut fruit impurity rate is very high, and a satisfactory harvesting effect cannot be achieved.

[0003] In response to the problem of insufficient air suction volume of the above-mentioned grass-removing fan, CN206658538U discloses a cleaning tangential-flow rotary fan suitable for a self-propelled peanut picking and harvesting machine, which has improvements in air volume and width. Currently, the cleaning tangential-flow rotary fan has been widely used in peanut picking machines, and can achieve its basic function of cleaning peanuts. However, when harvesting spring peanuts or peanut vines with long straw, the fan cannot clean the peanuts due to its large feed volume, and the rear end of the screen box is too far from the fan outlet, so many straws and uncleaned peanuts fall into the debris auger, which returns to the fruit picking room through the debris elevator and is cleaned again by the fan, increasing the load of the fan and causing blockage of the entire cleaning system.

[0004] In addition, with the existing peanut picking machines, after the peanut stalks enter the grass box, a large amount of dust will come out of the grass box, thus polluting the environment; if there is a rear wind blowing from behind the vehicle, the dust-containing gas will be blown to the front of the vehicle, and the driver's vision will be obstructed.

[0005] Based on this, the present invention is proposed. Summary of the invention

[0006] One of the purposes of the present invention is to provide a secondary cleaning system for a peanut picker, which can solve the problems of easy blockage of debris auger and fruit auger during the harvesting process of the peanut picker and high trash content in the collected peanuts.

[0007] The technical solution of the present invention is: a secondary cleaning system for a peanut picker, comprising a vibrating screen, a first cleaning fan, a second cleaning fan and a debris elevator, the vibrating screen being obliquely arranged at the lower part of the straw chopper of the peanut picker, the lower head end of the vibrating screen being provided with the first cleaning fan, the lower end being provided with the second cleaning fan and the debris elevator, the air outlet of the second cleaning fan being provided at the end of the debris elevator away from the first cleaning fan.

[0008] Furthermore, a fan air duct is also provided at the lower end of the vibrating screen. The arc-shaped fan air duct half surrounds the lower end of the debris elevator. The air outlet of the second cleaning fan blows into the fan air duct along the tangential direction and is blown out along the outlet of the debris elevator. The air outlet of the first cleaning fan blows along the vibrating screen to the outlet of the debris elevator.

[0009] Furthermore, the wind blown in by the second cleaning fan from one end of the debris elevator passes through the bottom of the debris elevator and is blown out from the other end thereof.

[0010] Furthermore, the second cleaning fan includes an impeller, a seat bearing, a fan housing and a fan pulley, the impeller body is arranged in the fan housing, the two ends of the impeller are mounted on the seat bearings at both ends of the fan housing, and the impeller shaft is connected to the fan pulley.

[0011] Furthermore, the fan housing is provided with an air inlet inclined downward, and the opening size of the air inlet is regulated by an air volume adjustment plate, and the air volume adjustment plate is fixed to the fan housing by a butterfly nut.

[0012] Furthermore, the fan air duct is an arc-shaped air duct along the width direction of the peanut picking locomotive, one end of which is connected to the air outlet of the second cleaning fan, and a debris cleaning port is opened on the lower side, which is closed by a debris cleaning port cover plate, one side of the debris cleaning port cover plate is connected to the air duct body through a rotating shaft, and the other side is connected to the air duct body through a snap.

[0013] One of the purposes of the present invention is to provide a dust removal device for a peanut picker, which can significantly eliminate the dust-containing gas emerging from the grass box of the peanut picker. The dust removal device of the peanut picker includes a water mist nozzle and a water tank. The water mist nozzle is arranged on the upper cover of the grass box of the peanut picker, and the water tank is arranged at the lower part of the grass box. A high-pressure water pump and an accumulator are arranged in the water tank, and the accumulator presses water to the water mist nozzle through a pipeline.

[0014] Furthermore, the grass box upper cover is arranged on the upper part of the grass box, and the grass box upper cover is a hollow double-layer structure, one layer is a straw feeding layer, which is connected with the grass box feeding port and the inside of the grass box respectively; the other layer is an airflow discharge layer, and the airflow inside the grass box enters into the airflow discharge layer through the air inlet of the airflow discharge layer, and then is discharged through the air outlet.

[0015] Furthermore, the straw feeding layer includes two symmetrically arranged air flow channels, each of which is composed of an outer baffle, an inner baffle and a top plate. The air flow channel extends from one end of the straw box upper cover connected to the straw box feeding port to the other end close to the air outlet, and its depth gradually becomes shallower; the inner baffles of the two air flow channels are connected at both ends to form the air inlet of the air flow discharge layer.

[0016] One of the purposes of the present invention is to provide a peanut picker, which includes the secondary cleaning system of the above-mentioned peanut picker and / or the dust removal device of the peanut picker.

[0017] Furthermore, the peanut picker also includes a fruit picking roller, a straw chopper, a grass discharge fan, a material lifting cylinder and a grass box. A grass box feeding inlet is opened on the left side of the upper end of the grass box, and the grass discharge fan is connected to the input end of the grass box feeding inlet. A material lifting cylinder and a straw chopper installed on the left side of the material lifting cylinder are arranged at the lower side of the grass discharge fan. The straw chopper is installed at the straw outlet at the rear end of the fruit picking roller.

[0018] The advantages of the present invention over the prior art include: 1. A second cleaning fan is added on the side of the debris elevator to increase the cleaning wind force, prevent straw and uncleaned peanuts from falling into the debris agitator, and avoid clogging of the entire cleaning system; 2. The inlet of the second cleaning fan is tilted downward to prevent debris from entering the second cleaning fan from the gap between the grass discharge fan and the grass box, causing clogging of the second cleaning fan. The outlet of the second cleaning fan is connected to the lower side of the screening tail through an air supply duct, and clean air enters the upper side of the debris agitator shaft. The impurity mixture dropped from the secondary cleaning vibrating screen and the impurity gas are absorbed by the grass discharge fan and returned to the straw chamber of the grass box; 3. The second cleaning fan has high-speed air intake, which increases the inlet pressure of the material lifting cylinder, assists the grass discharge fan in discharging grass, and prevents heavier straw from falling into the debris elevator again; 4. A water tank is added at the lower part of the grass box, which also serves as a hand-washing water tank for the convenience of the operator. In addition, a high-pressure water pump and an accumulator are arranged in the water tank. The accumulator presses water through a pipeline to the water mist nozzle end on the upper cover of the grass box, and the water mist nozzle sprays high-pressure water mist to reduce dust from the dust-containing gas; 5. A mixture of peanut straw and dust enters the grass box body from the grass box feeding inlet. Under the guiding effect of the two symmetrically arranged air flow channels, a vortex airflow of the mixture is formed at the bottom of the straw chamber of the grass box. The straw is thrown around the inner cavity of the straw chamber of the grass box by its own weight, and gradually increases until the box is full. The dust enters the straw chamber of the grass box from the grass box feeding inlet, the space becomes larger, the airflow speed slows down, part of the dust settles inside the straw chamber of the grass box, and part of the airflow will rebound straight up at the bottom of the center of the straw chamber of the grass box and be discharged through the air outlet channel on the upper cover of the grass box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1The utility model is a left side cross-sectional schematic diagram of the overall structure of a peanut picking machine of the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the right view structure.

[0021] Figure 3 The present invention is a schematic diagram of the side structure of a second cleaning fan of a secondary cleaning system of a peanut picker.

[0022] Figure 4 yes Figure 3 Schematic diagram of the front view structure.

[0023] Figure 5 The present invention is a schematic diagram of the structure of a fan air duct of a secondary cleaning system of a peanut picking machine.

[0024] Figure 6 The utility model is a top view structural schematic diagram of a dust removal device of a peanut picking machine of the present invention.

[0025] Figure 7 The present invention is a schematic diagram of the airflow direction of the upper cover of the grass box of the dust removal device of the peanut picker.

[0026] Among them, 1-fruit picking roller, 2-straw chopper, 3-grass discharge fan, 4-grass box feeding inlet, 5-water mist nozzle, 6-air outlet, 61-air inlet, 7-grass box cover, 8-air flow channel, 81-outer baffle, 82-inner baffle, 83-top plate, 9-material lifting cylinder, 10-grass box, 11-grass box straw room, 12-frame, 13-water tank, 14-fan airway, 141-airway body, 142-cleaning port, 143-rotating shaft, 144-cleaning port cover plate, 15-secondary cleaning fan, 151-impeller, 152-seat bearing, 153-fan housing, 154-fan pulley, 155-butterfly nut, 156-air volume adjustment plate, 16-waste elevator, 17-vibrating screen, 18-cleaning fan, 19-crop feeding port, 20-fruit agitator, 21-waste lifting mechanism, 22-chopper pulley, 23-tensioning wheel. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-7 , a secondary cleaning system, a dust removal device and a peanut picker of the present invention are further described. It should be noted that the following embodiments can only be used to explain the technical solution of the present invention and cannot be interpreted as limiting the present invention.

[0028] like Figure 1 and Figure 2As shown, a peanut picking machine provided by the present invention comprises a fruit picking drum 1, a straw chopper 2, a grass discharge fan 3, a material lifting cylinder 9, a grass box 10 and a secondary cleaning system, a grass box feeding inlet 4 is opened on the left side of the upper end of the grass box 10, the grass discharge fan 3 is connected to the input end of the grass box feeding inlet 4, a material lifting cylinder 9 and a straw chopper 2 installed on the left side of the material lifting cylinder 9 are arranged on the lower side of the grass discharge fan 3, and the straw chopper 2 is installed at the outlet of the straw at the rear end of the fruit picking drum 1.

[0029] A secondary cleaning system is arranged at the lower part of the straw chopper 2, and the secondary cleaning system includes a vibrating screen 17, a first cleaning fan 18, a second cleaning fan 15, a fan air duct 14 and a waste elevator 16. The vibrating screen 17 is arranged obliquely at the lower part of the straw chopper 2, the first cleaning fan 18 is arranged at the lower head end of the vibrating screen 17, and the fan air duct 14, the second cleaning fan 15 and the waste elevator 16 are arranged at the lower end. The arc-shaped fan air duct 14 half surrounds the lower end of the waste elevator 16 to form a semi-enclosed space with an opening facing upwards. The outlet of the second cleaning fan 15 blows into the fan air duct 14 along the tangential direction and blows out along the outlet of the waste elevator 16. The outlet of the first cleaning fan 18 blows toward the outlet of the waste elevator 16 along the vibrating screen 17. The first cleaning fan 18 can be a cleaning tangential flow cyclone fan.

[0030] like Figure 3 and Figure 4 As shown, the second cleaning fan 15 includes an impeller 151, a seat bearing 152, a fan housing 153 and a fan pulley 154. The main body of the impeller 151 is arranged in the fan housing 153, and the two ends of the impeller 151 are mounted on the seat bearings 152 at the two ends of the fan housing 153. The wheel shaft of the impeller 153 is connected to the fan pulley 154. The transmission system of the second cleaning fan 15 is on the right side of the peanut picker. The driving wheel is the chopper pulley 22, and the driven wheel is the fan pulley 29. The middle is connected by a belt. There is a tensioning wheel 23 on the lower side of the belt, which is used to tension the belt and change the running position of the belt to avoid interference with the movement of the whole machine.

[0031] like Figure 3 As shown, the fan housing 153 is provided with an air inlet inclined downward, and the opening size of the air inlet is regulated by an air volume adjustment plate 156 , and the air volume adjustment plate 156 is fixed to the fan housing 153 by a butterfly nut 155 .

[0032] like Figure 5As shown, the fan air duct 14 is an arc-shaped air duct with a length along the width direction of the peanut picking locomotive, one side edge of which is connected to the air outlet of the secondary fan 15, and a debris clearing port 142 is provided on the lower side of the air duct body 141 of the fan air duct 14, and the debris clearing port 142 is closed by a debris clearing port cover 144, one side of the debris clearing port cover is connected to the air duct body 141 through a rotating shaft 143, and the other side is connected to the air duct body 141 through a buckle. The cover can be easily opened to facilitate cleaning of debris entering the fan air duct 14.

[0033] like Figure 1 As shown, the dust removal device of the peanut picker provided by the present invention comprises a water mist nozzle 5 and a water tank 13, the water mist nozzle 5 is arranged on the grass box upper cover 7 of the peanut picker, the water tank 13 is arranged at the lower part of the grass box 10, a high-pressure water pump and an accumulator are arranged in the water tank 13, and the accumulator presses water to the water mist nozzle 5 through a pipeline. The water mist nozzle 5 sprays high-pressure water mist to reduce dust from dust-containing gas.

[0034] like Figure 6 and Figure 7 As shown, the straw box upper cover 7 is arranged on the upper part of the straw box 10. The straw box upper cover 7 is a hollow double-layer structure, one layer of which is a straw feeding layer, which is connected to the straw box feeding port 4 and the interior of the straw box 10 respectively; the other layer is an airflow discharge layer, and the airflow inside the straw box enters the airflow discharge layer through the air inlet 61 of the airflow discharge layer, and then is discharged through the air outlet 6.

[0035] Figure 7 The present invention discloses the airflow direction of the straw box upper cover 7 of the dust removal device of the peanut picker. The straw feeding layer of the straw box upper cover 7 includes two symmetrically arranged air flow channels 8. Each air flow channel 8 is composed of an outer baffle plate 81, an inner baffle plate 82 and a top plate 83. Each air flow channel 8 extends from one end of the straw box upper cover 7 connected to the straw box feeding port 4 to the other end close to the air outlet 6, and its depth gradually becomes shallower; the inner baffle plates 82 of the two air flow channels 8 are connected at both ends to form the air inlet 61 of the air flow discharge layer.

[0036] Each air flow channel 8 is a channel with an approximately 90-degree right-angle bend, and the air inlet 61 formed between the two air flow channels 8 is approximately quadrilateral.

[0037] Typical scenarios of the peanut picker, secondary cleaning system and dust removal device of the present invention when working are described as follows.

[0038] When harvesting peanuts, under the relative action of the cone spiral blades at the front end of the drum and the grass guide strips at the drum feed inlet, the crop quickly enters the inside of the fruit picking drum 1 from the crop feed inlet 19 of the peanut picker axially. As the fruit picking drum 1 rotates, the arc-shaped knife teeth row forcibly drags the crop. When the drum passes through the sieve holes of the front concave plate, the stems and peanuts are separated. The stems and vines are continued to be dragged upward by the drum, and under the action of the spiral grass guide plate on the upper cover, they move axially from front to back, and spirally enter the rear concave plate, and the stems and vines are thoroughly picked and separated again. They continue to rotate to the top of the rear tail, fluff up in the larger gap, and the peanuts fall into the rear concave plate. The stems and grass are thrown into the straw chopper 2 at the grass discharge port, chopped by high-speed operation, and sucked away by the grass discharge fan 3 and sent to the grass box 10. The separated peanuts and impurities pass through the sieve holes of the front and rear concave plates and directly enter the vibrating screen 17 of the cleaning chamber. Under the action of the vibrating screen 17, the impurity mass is quickly pushed to the rear by the shaking plate. The peanuts are pushed backward by the vibration of the scraper and the screen. When the peanuts pass through the sieve holes, they pass through the sieve holes under their own weight and directly enter the fruit agitator 20. At the same time, the impurities fall vertically into the vibrating screen 17 and the fruit agitator 20, forming a material curtain. The first cleaning fan 18 blows the cleaning impurities out of the cleaning chamber at one time, and the clean peanuts fall into the fruit agitator 20 by their own weight and are collected in the fruit box. The uncleaned impurities fall into the impurities agitator 16 under the action of the rear section of the vibrating screen 17 and the fruit recovery slide plate, and a material curtain is formed when they fall from the tail of the screen box to the impurities agitator 16. The high-speed airflow blown by the second cleaning fan 15 goes around the impurities elevator 16 for nearly a circle, and enters the upper side of the impurities elevator 16 from the rear end of the screen box. The high-speed airflow The debris mixture dropped from the rear end of the screen box is cleaned again, and the debris enters the grass box 10 through the grass discharge fan 3. The clean peanuts cleaned for the second time fall into the debris elevator 16, so that the mixture falling into the debris elevator 16 will be reduced a lot, preventing the debris elevator 16 from being blocked. A small amount of peanuts entering the debris elevator 16 are concentrated and pushed to the debris lifting mechanism 21 on the right outer side of the cleaning chamber, and enter the vibrating screen 17 again through the elevator for cleaning again until clean peanuts are cleaned. Since less material repeatedly enters the fruit picking chamber from the debris lifting mechanism 21, the load of the vibrating screen 17 is reduced, so that the entire fruit picking and cleaning system can operate benignly, the debris content of the peanuts falling into the fruit agitator is reduced, the fruit agitator is no longer blocked, and the peanuts entering the fruit box are cleaner.

[0039] The secondary cleaning system includes a second cleaning fan 15 installed at the rear side of the debris elevator 16 and a fan air duct 14. The fan air duct 14 is around the debris elevator 16 for nearly a circle. The air duct body 141 of the fan air duct 14 is provided with a cleaning port 142 for cleaning the debris in the air duct to prevent the second cleaning fan 15 from being blocked and damaged. An air volume adjustment plate 156 is installed on the second cleaning fan 15. The air volume adjustment plate 156 is fixed to the fan housing 153 with a butterfly nut 155. The air supply volume of the second cleaning fan 15 is adjusted by adjusting the opening size of the air volume adjustment plate 156. When the opening is reduced, the air volume is reduced; when the opening is increased, the air volume is increased. Reasonable adjustment of the air volume of the second cleaning fan 15 can prevent straw from being stuck in the straw box 10.

[0040] The upper cover 7 of the straw box includes two air flow channels 8 and an air outlet 6. The straw entering the straw box 10 from the straw box feeding port 4 is driven by the air flow to move to both sides through the air flow channels 8. The structure of the air flow channel 8 plays a guiding role, limiting the flow direction of the wind to be inclined downward. The air flow moves along the air flow channel 8 and is inclined downward, generating a swirling airflow inside the straw box 10, which offsets and weakens each other, and the straw is deposited at the bottom of the straw box 10. Because the straw box has only one outlet, the weakened airflow swirls upward, passes through the upper air inlet 61 in the middle of the upper cover 7 of the straw box, and then passes through the outlet. The air is discharged through the air outlet 6. During the discharge process, the water mist nozzle 5 of the grass box upper cover 7 sprays the dust-containing airflow. Due to the strong adsorption effect of the water mist, the dust-containing gas is filtered, and the impurities fall into the grass box 10. The filtered gas is discharged horizontally to the rear of the vehicle through the air outlet 6. The air outlet 6 is inclined downward at the rear of the vehicle to prevent the airflow from blowing to a farther place and causing air pollution in a larger area. At the same time, when there is a rear wind blowing from the rear of the vehicle, the blocking effect of the grass box 10 can prevent the dust-containing gas from being blown to the front of the vehicle and obstructing the driver's line of sight.

[0041] A feature of the present invention is that a second cleaning fan 15 is arranged on the right side of the debris elevator 16, and the inlet of the second cleaning fan 15 is inclined downward to prevent debris from the gap between the grass discharge fan 3 and the grass box 10 from entering the second cleaning fan 15 and causing blockage of the second cleaning fan 15. The outlet of the second cleaning fan 15 is connected to the lower side of the screening tail through an air supply duct, and clean air enters the upper side of the debris auger shaft. The impurity mixture dropped from the secondary cleaning vibrating screen and the impurity gas are absorbed by the grass discharge fan 3 and returned to the straw chamber 11 of the grass box.

[0042] Here, the second cleaning fan 15 plays two roles. First, there are many peanuts containing dust and straw falling from the tail of the vibrating screen 17 and the material lifting cylinder 9. The original equipment often blocks the debris elevator 15, causing the debris elevator 15 to overload and affect the harvest of peanuts. The wind from the second cleaning fan 15 plays a role in cleaning the debris, reducing the material falling into the debris elevator 16 and preventing blockage. Second, the second cleaning fan 15 has a high-speed air intake, which increases the inlet pressure of the material lifting cylinder, assists the grass discharge fan 3 in discharging grass, and prevents the heavy straw from falling into the debris elevator 16 again.

[0043] Another feature of the present invention is that a water tank 13 is added to the lower part of the grass box assembly 10. The water tank 13 also serves as a hand washing tank, which is convenient for the machine operator to use. The water tank is connected to the water mist nozzle, and the water mist nozzle 5 sprays high-pressure water mist to reduce dust in the dust-containing gas.

[0044] A mixture of peanut straw and dust enters the straw box body from the straw box feeding port 4, and under the guiding action of the air flow channel 8, a vortex airflow of the mixture is formed at the bottom of the straw chamber 11 of the straw box, and the straw is thrown around the inner cavity of the straw chamber 11 of the straw box by its own weight, and gradually increases to fill the box. When the dust enters the straw chamber 11 of the straw box from the straw box feeding port 4, the space becomes larger, and the air flow speed becomes slower. Part of the dust settles inside the straw chamber of the straw box, and part of the air flow will rebound straight up at the center bottom of the straw chamber 11 of the straw box and be discharged through the air outlet 6 of the straw box upper cover 7.

[0045] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A secondary cleaning system for a peanut picking machine, characterized in that: It comprises a vibrating screen (17), a first cleaning fan (18), a second cleaning fan (15) and a debris elevator (16), wherein the vibrating screen (17) is arranged obliquely at the lower part of the straw chopper (2) of the peanut picker, the first cleaning fan (18) is arranged at the lower head end of the vibrating screen (17), the second cleaning fan (15) and the debris elevator (16) are arranged at the lower end, and the air outlet of the second cleaning fan (15) is arranged at the end of the debris elevator (16) away from the first cleaning fan (18); A fan air duct (14) is also provided at the lower end of the vibrating screen. The arc-shaped fan air duct (14) half surrounds the lower end of the debris elevator (16). The air outlet of the second cleaning fan (15) blows into the fan air duct (14) along a tangential direction and blows out along the outlet of the debris elevator (16). The air outlet of the first cleaning fan (18) blows along the vibrating screen (17) to the outlet of the debris elevator (16). The wind blown in by the second cleaning fan (15) from one end of the debris elevator (16) passes through the bottom of the debris elevator (16) and then blown out from the other end thereof; The fan air duct (14) is an arc-shaped air duct along the width direction of the peanut picking locomotive, one end of which is connected to the air outlet of the second cleaning fan (15), and a debris cleaning port (142) is opened on the lower side. The debris cleaning port (142) is closed by a debris cleaning port cover plate (144), and one side of the debris cleaning port cover plate (144) is connected to the air duct body (141) through a rotating shaft (143), and the other side is connected to the air duct body (141) through a buckle.

2. The secondary cleaning system of the peanut picking machine as claimed in claim 1, characterized in that: The second cleaning fan (15) comprises an impeller (151), a seat bearing (152), a fan housing (153) and a fan pulley (154); the main body of the impeller (151) is arranged in the fan housing (153); the two ends of the impeller (151) are mounted on the seat bearings (152) at the two ends of the fan housing (153); and the wheel shaft of the impeller (151) is connected to the fan pulley (154).

3. The secondary cleaning system of the peanut picking machine as claimed in claim 2, characterized in that: The fan housing (153) is provided with an air inlet inclined downward, the opening size of the air inlet is regulated by an air volume adjustment plate (156), and the air volume adjustment plate (156) is fixed to the fan housing (153) by a butterfly nut (155).

4. A peanut picking machine, characterized in that: The invention comprises a secondary cleaning system of the peanut picking machine as described in any one of claims 1 to 3.

5. The peanut picking machine according to claim 4, characterized in that: The peanut picking machine further comprises a fruit picking drum (1), a straw chopper (2), a grass discharge fan (3), a material lifting cylinder (9) and a straw box (10). A straw box feeding inlet (4) is provided on the left side of the upper end of the straw box (10). The straw discharge fan (3) is connected to the input end of the straw box feeding inlet (4). A material lifting cylinder (9) and a straw chopper (2) installed on the left side of the material lifting cylinder (9) are arranged on the lower side of the grass discharge fan (3). The straw chopper (2) is installed at the straw outlet at the rear end of the fruit picking drum (1).

6. The peanut picking machine according to claim 4, characterized in that: The machine also includes a dust removal device, the dust removal device including a water mist nozzle (5) and a water tank (13), the water mist nozzle (5) being arranged on the upper cover (7) of the grass box of the peanut picker, the water tank (13) being arranged at the lower part of the grass box (10), a high-pressure water pump and an accumulator being arranged in the water tank (13), and the accumulator presses water to the water mist nozzle (5) through a pipeline.

7. The peanut picking machine according to claim 6, characterized in that: The straw box upper cover (7) is arranged on the upper part of the straw box (10), and the straw box upper cover (7) is a hollow double-layer structure, one layer is a straw feeding layer, which is connected to the straw box feeding port (4) and the inside of the straw box (10) respectively; the other layer is an air flow discharge layer, and the air flow inside the straw box (10) enters the air flow discharge layer through the air inlet (61) of the air flow discharge layer, and then is discharged through the air outlet (6).

8. The peanut picking machine according to claim 7, characterized in that: The straw feeding layer comprises two symmetrically arranged air flow channels (8), each of which is composed of an outer baffle (81), an inner baffle (82) and a top plate (83). The air flow channel (8) extends from one end of the straw box upper cover (7) connected to the straw box feeding port (4) to the other end close to the air outlet (6), and its depth gradually becomes shallower; the inner baffles (82) of the two air flow channels (8) are connected at both ends to form the air inlet (61) of the air flow discharge layer.

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