An airflow cleaning auger-type conveying mechanism and method, conveying equipment and harvester

Abstract

The present invention provides an airflow cleaning auger-type conveying mechanism and method, as well as a conveying device and a harvester, comprising a conveying auger, a detection mechanism, a centrifugal fan module, an airflow nozzle and a control unit. The control unit calculates the theoretical outlet wind speed based on the angle between the axis of the conveying auger and the horizontal plane. When the actual outlet wind speed of the airflow nozzle is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module to increase the wind speed. After the debris discharge window is opened for a preset time, the detection mechanism detects whether there are any residues in the conveying auger. If there are any residues, the control unit controls the centrifugal fan module to increase the wind speed. If there are no residues, the control unit controls the debris discharge window to close. The present invention uses a positive pressure airflow cleaning method in the conveying auger to clean the residues in the auger, and can automatically discharge the residues in the conveying auger. The cleaning effect is excellent, and the self-cleaning ability of the harvester is improved, so that the harvester can operate efficiently.

Description

Technical Field

[0001] The present invention belongs to the field of conveying machinery, and in particular relates to an airflow cleaning auger-type conveying mechanism and method, conveying equipment and a harvester. Background Art

[0002] Auger conveying mechanisms are widely used in the conveying equipment field. They have the advantages of simple structure and high conveying efficiency. However, after use, they always leave conveyed objects and other debris in the structure. If these residues are not cleaned promptly, they will accumulate in the corners and gaps of the auger mechanism, causing the conveyed objects to be mixed when the auger conveyor conveys other objects next time. To deal with these residues, manual cleaning is generally used, but the cleaning effect is poor and time-consuming and labor-intensive. Therefore, the self-cleaning ability of the auger conveyor needs to be improved.

[0003] In particular, in the cleaning of residues from the unloading auger of a combine harvester, the existing technology uses vibration and a method of setting negative pressure at the bottom of the unloading auger of the combine harvester to clean the grain box and the unloading auger of the combine harvester. However, when discharging the residues, the end cover under the unloading auger still needs to be opened manually. The negative pressure cleaning consumes a lot of power and has high requirements for the airtightness of the working environment. In addition, this method is not suitable for auger-type conveying mechanisms under other working conditions. Summary of the Invention

[0004] In response to the above technical problems, one of the purposes of one embodiment of the present invention is to provide an airflow cleaning auger-type conveying mechanism, which is equipped with an airflow cleaning device; the present invention adopts a positive pressure airflow cleaning method in the conveying auger to clean the residues in the auger mechanism, overcoming the high power consumption under the negative pressure cleaning state and the high airtightness requirements of the working environment, and is more versatile. It can automatically clean various auger-type conveying mechanisms and can automatically discharge the residues in the conveying auger.

[0005] One of the purposes of one embodiment of the present invention is to set up a detection mechanism to collect the inclination angle of the auger-type conveying mechanism relative to the horizontal plane under different working conditions in real time. The control unit controls the centrifugal fan module to adaptively adjust the fan blade speed according to the inclination angle information, thereby adjusting the outlet wind speed to achieve a better and more stable cleaning effect.

[0006] One of the purposes of one embodiment of the present invention is to provide a conveying device comprising the augers conveying mechanism, which has an excellent cleaning effect and high efficiency.

[0007] One of the purposes of one embodiment of the present invention is to provide a harvester, which includes an augers conveying mechanism with an airflow cleaning device, which has the advantages of excellent cleaning effect, saving manpower, improving the self-cleaning ability of the harvester, and allowing the harvester to operate efficiently.

[0008] One of the purposes of one embodiment of the present invention is to provide a control method for an auger-type conveying mechanism with an airflow cleaning device.

[0009] Note that the inclusion of these objectives does not preclude the existence of other objectives. One embodiment of the present invention does not necessarily achieve all of the above objectives. Objectives other than the above objectives may be extracted from the description of the specification, drawings, and claims.

[0010] The present invention achieves the above technical objectives through the following technical means.

[0011] An airflow cleaning auger-type conveying mechanism, comprising a conveying auger, a detection mechanism, a centrifugal fan module, an airflow nozzle and a control unit;

[0012] The centrifugal fan module is connected to one end of the airflow nozzle, and the other end of the airflow nozzle is connected to the conveying auger, and the conveying auger is also provided with a debris discharge window;

[0013] The detection mechanism is used to detect the actual outlet wind speed of the airflow nozzle, the angle α between the axis of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmit them to the control unit;

[0014] The control unit is respectively connected to the detection mechanism, the centrifugal fan module and the debris removal window; the control unit controls the opening of the debris removal window and the centrifugal fan module, and calculates the theoretical outlet wind speed according to the angle α between the axis direction of the conveying auger and the horizontal plane. When the actual outlet wind speed of the airflow nozzle is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module to increase the wind speed. After the debris removal window is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger. If there is any residue, the control unit controls the centrifugal fan module to increase the wind speed. If there is no residue, the control unit controls the debris removal window to close.

[0015] In the above solution, the centrifugal fan module includes a centrifugal fan and a speed regulator; the centrifugal fan and the speed regulator are connected, and the control unit is connected to the centrifugal fan and the speed regulator respectively.

[0016] The above solution further includes an electric push rod; the electric push rod is connected to the debris removal window, the control unit is connected to the electric push rod, and the electric push rod is used to control the opening and closing of the debris removal window.

[0017] The above solution further includes a display; the display is connected to the control unit.

[0018] In the above solution, the detection mechanism includes a wind speed sensor, an inclination sensor and several groups of beam-type photoelectric switches;

[0019] The wind speed sensor is used to detect the wind speed at the outlet of the air flow nozzle; the inclination sensor is used to detect the angle α between the axis direction of the conveying auger and the horizontal plane; the through-beam photoelectric switch is used to detect whether there is any residue in the conveying auger; the wind speed sensor, inclination sensor and through-beam photoelectric switch are respectively connected to the control unit.

[0020] In the above scheme, the base of the air flow nozzle is circular, the base is connected to the air flow hose, the middle part of the air flow nozzle is an arc-shaped wall, the ratio of the middle length of the air flow nozzle to the base diameter is 1:1 to 2:1, and the head of the air flow nozzle is also provided with a booster cylinder, the ratio of the outlet area of ​​the booster cylinder to the base area is 1:4 to 1:3, and a fine metal mesh is provided at the outlet of the booster cylinder.

[0021] In the above solution, when the detection mechanism detects that the angle between the conveying auger axis and the horizontal plane is α=0,

[0022] The airflow at the nozzle outlet must be able to move the residue in the auger pipe as a whole. Assuming that the auger pipe is in a horizontal state under certain working conditions, the critical condition for movement is that the wind force on the residue is greater than the friction force, that is:

[0023]

[0024] Where: C is the resistance coefficient, ρ is the air density, S1 is the cross-sectional area of ​​the residue in the auger pipe, V1 is the velocity of the airflow near the impurity discharge window, μ is the static friction coefficient between the residue and the inner wall of the auger pipe, m is the mass of the residue, g is the acceleration of gravity, R is the arc radius of the horizontal auger pipe, and β is half of the central angle of the chord length of the horizontal auger pipe arc.

[0025] The theoretical outlet velocity V0 of the airflow nozzle is:

[0026]

[0027] in:

[0028]

[0029] Where: V m is the axial velocity of the cleaning airflow near the impurity removal window, a is the turbulence coefficient, s is the horizontal distance between the airflow nozzle and the impurity removal window; h is the height of the airflow nozzle outlet, y is the vertical distance between the impurity removal window and the central axis of the cleaning airflow,

[0030] f is the jet half height of the airflow section near the impurity removal window, which is calculated by the following formula:

[0031] f=2.44(as+0.41b0)

[0032] b0 is the half height of the airflow nozzle outlet, b0 = 1 / 2h;

[0033] Combining the above formulas 1, 2, and 3, we can get the theoretical outlet velocity V0 of the airflow nozzle in the horizontal state, which must satisfy:

[0034]

[0035] Furthermore, when the detection mechanism detects that the angle α between the conveying auger axis and the horizontal plane is greater than 0, the wind force on the residue should be greater than the sum of the friction force on the residue and the gravity component force in the above-mentioned axis direction, that is:

[0036]

[0037] Combining the above formulas 4 and 5, the theoretical outlet wind speed V of the airflow nozzle in the tilted state is 0α Need to meet:

[0038]

[0039] A conveying device comprises the airflow cleaning auger type conveying mechanism.

[0040] A harvester comprises the airflow cleaning auger-type conveying mechanism.

[0041] In the above scheme, the conveying auger is a harvesting platform auger, a grain conveying auger, a miscellaneous auger, a grain unloading auger or a threshing auger.

[0042] The conveying auger is a grain unloading auger; the grain unloading auger includes a horizontal auger, an auger elbow and a vertical lifting auger; the horizontal auger is connected to the vertical lifting auger through the auger elbow; the horizontal auger is arranged at the bottom of the grain box; the debris discharge window is arranged at the auger elbow.

[0043] Furthermore, the grain tank has six airflow nozzles, including a first airflow nozzle, a second airflow nozzle, a third airflow nozzle, a fourth airflow nozzle, a fifth airflow nozzle and a sixth airflow nozzle;

[0044] The first air flow nozzle is arranged at one end below the horizontal auger near the vertical side plate of the grain tank, the second air flow nozzle and the third air flow nozzle are respectively installed in the horizontal auger pipe at the bottom of the grain tank, the fourth air flow nozzle is installed on the inside of the auger elbow, the fifth air flow nozzle and the sixth air flow nozzle are respectively installed in the middle and top of the vertical lifting auger, and small openings are opened at the bottom of the vertical side plate of the grain tank, the two inclined side plates of the grain tank, one side of the auger elbow, and the middle and top of the vertical lifting auger for installing the air flow nozzles;

[0045] It also includes an air separator; the air separator includes a first-level air separator and two second-level air separators; one end of the first-level air separator is connected to the centrifugal fan module, and the other end is connected to the second-level air separator through an air flow hose, one second-level air separator is connected to the first air flow nozzle, the second air flow nozzle, and the third air flow nozzle through an air flow hose, and the other second-level air separator is connected to the fourth air flow nozzle, the fifth air flow nozzle, and the sixth air flow nozzle through an air flow hose.

[0046] Furthermore, the duct-type wind speed sensor is arranged at the outlet of the first airflow nozzle, and is used to detect the wind speed at the outlet of the first airflow nozzle and feed it back to the control unit;

[0047] The inclination sensor is arranged at the bottom of the grain tank, and is used to detect the angle α between the bottom of the grain tank and the horizontal plane in the direction of the horizontal auger axis and transmit the information to the control unit;

[0048] The beam-type photoelectric switch is divided into a transmitting end and a receiving end. The transmitting end is arranged at the bottom end inside the auger elbow, and the receiving end is arranged at the bottom of the grain tank. The transmitting end and the receiving end are at the same horizontal height, and the connecting line passes through the gap between the horizontal auger pipe and the horizontal auger blade, which is used to detect whether there is any residue in the horizontal auger pipe and the auger elbow.

[0049] A control method for the airflow cleaning auger-type conveying mechanism includes the following steps:

[0050] The detection mechanism detects the wind speed at the outlet of the airflow nozzle, the angle α between the axis of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmits them to the control unit;

[0051] The control unit controls the opening of the debris removal window and the centrifugal fan module. The control unit calculates the theoretical outlet wind speed based on the angle α between the axis of the conveying auger and the horizontal plane. When the actual outlet wind speed of the airflow nozzle is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module to increase the wind speed. After the debris removal window is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger. If there is any residue, the control unit controls the centrifugal fan module to increase the wind speed. If there is no residue, the control unit controls the closing of the debris removal window.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] According to one aspect of the present invention, an auger-type conveying mechanism with an airflow cleaning device is used to address the problem of residue remaining within the structure of existing auger-type conveying mechanisms after conveying, thereby achieving automatic removal and cleaning of the residue. A detection mechanism is provided to collect the inclination angle of the auger-type conveying mechanism relative to the horizontal plane under different operating conditions in real time. Based on this inclination angle information, a control unit controls the centrifugal fan module to adaptively adjust the fan blade speed, thereby adjusting the outlet air velocity to achieve a better and more stable cleaning effect.

[0054] According to one embodiment of the present invention, the present invention collects the air flow outlet wind speed in real time through a duct-type wind speed sensor, and the speed regulator of the centrifugal fan adaptively adjusts the rotation speed of the fan blades according to the wind speed change, so that the outlet air flow reaches a preset value, thereby improving the reliability of cleaning.

[0055] According to one embodiment of the present invention, the present invention uses a beam-type photoelectric switch to detect in real time whether there is residue at the bottom of the horizontal auger pipe and the bottom of the auger elbow, replacing the current detection method that mostly relies on manual observation, making the detection more automated.

[0056] According to one embodiment of the present invention, the present invention realizes automatic opening and closing of the debris removal window through an electric push rod, thereby avoiding manual loading and unloading of the debris removal window and effectively saving cleaning time.

[0057] In one embodiment of the present invention, self-cleaning is performed by a conveying device equipped with the airflow cleaning auger-type conveying mechanism, and the cleaning effect is excellent and efficient.

[0058] According to one embodiment of the present invention, the present invention uses a harvester with an augers conveying mechanism having an airflow cleaning device, which can adaptively adjust the wind speed according to different working conditions to perform self-cleaning after the conveying operation is completed. It has the advantages of excellent cleaning effect and manpower saving, improves the self-cleaning ability of the harvester, and enables the harvester to operate efficiently.

[0059] Note that the description of these effects does not preclude the existence of other effects. One embodiment of the present invention does not necessarily have all of the above effects. Effects other than the above can be clearly seen and extracted from the description of the specification, drawings, claims, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the present invention.

[0061] Figure 2 It is a schematic diagram of the structure of a conveying auger according to one embodiment of the present invention.

[0062] Figure 3 It is a side structural schematic diagram of one embodiment of the present invention.

[0063] Figure 4Schematic diagram of the airflow nozzle arrangement structure according to one embodiment of the present invention.

[0064] Figure 5 This is an axial side view of an air flow nozzle according to one embodiment of the present invention.

[0065] Figure 6 4 is a cross-sectional view of an air flow nozzle according to one embodiment of the present invention.

[0066] Figure 7 for Figure 1 Enlarged view of point A.

[0067] Figure 8 for Figure 1 Enlarged view of point B.

[0068] Figure 9 This is a flow chart of a control system according to one embodiment of the present invention.

[0069] Figure 10 Schematic diagram of the cross section of a conveying auger according to one embodiment of the present invention.

[0070] In the figure: 1. Grain box; 2. Grain unloading auger; 4. Centrifugal fan module; 5. Air separator; 6. Air flow nozzle; 7. Duct wind speed sensor; 8. Inclination sensor; 9. Electric push rod; 10. Trash removal window; 11. Through-beam photoelectric switch; 101. Inclined side panel; 102. Horizontal auger duct; 201. Horizontal auger; 202. Auger elbow; 203. Vertical lifting auger; 501. First-stage air separator; 502. Second-stage air separator; 601. First air flow nozzle; 602. Second air flow nozzle; 603. Third air flow nozzle; 604. Fourth air flow nozzle; 605. Fifth air flow nozzle; 606. Sixth air flow nozzle; 1101. Transmitter; 1102. Receiver. DETAILED DESCRIPTION

[0071] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0072] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "front", "back", "left", "right", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0074] Example 1

[0075] An airflow cleaning auger-type conveying mechanism, comprising a conveying auger, a detection mechanism, a centrifugal fan module 4, an airflow nozzle 6 and a control unit;

[0076] The centrifugal fan module 4 is connected to one end of the airflow nozzle 6, and the other end of the airflow nozzle 6 is connected to the conveying auger, which is also provided with a debris discharge window 10;

[0077] The detection mechanism is used to detect the actual outlet wind speed of the airflow nozzle 6, the angle α between the axis of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmit it to the control unit;

[0078] The control unit is respectively connected to the detection mechanism, the centrifugal fan module 4 and the debris removal window 10; the control unit calculates the theoretical outlet wind speed based on the angle α between the conveying auger axis and the horizontal plane. When the actual outlet wind speed of the airflow nozzle 6 is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module 4 to increase the wind speed. After the centrifugal fan module 4 works for a preset time, the control unit controls the debris removal window 10 to open and discharge the residue. After the debris removal window 10 is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger. If there is any residue, the control unit controls the centrifugal fan module 4 to increase the wind speed. If there is no residue, the control unit controls the debris removal window 10 to close. The present invention collects the inclination angle of the auger conveying mechanism relative to the horizontal plane under different working conditions in real time by setting a detection mechanism. The control unit controls the centrifugal fan module to adaptively adjust the fan blade speed according to the inclination angle information, thereby adjusting the outlet wind speed to achieve a better and more stable cleaning effect.

[0079] According to this embodiment, preferably, the centrifugal fan module 4 includes a centrifugal fan and a speed regulator; the centrifugal fan and the speed regulator are connected, and the speed regulator is provided on the side of the centrifugal fan for adjusting the speed of the centrifugal fan. The control unit is connected to the centrifugal fan and the speed regulator respectively.

[0080] According to this embodiment, preferably, the speed regulator is an electronic speed regulator, and a potentiometer is used to adjust the conduction angle of the thyristor to change the voltage of the centrifugal fan motor to achieve speed regulation.

[0081] According to this embodiment, preferably, an electric push rod 9 is further included; the electric push rod 9 is connected to the debris removal window 10, and the control unit is connected to the electric push rod 9, and the electric push rod 9 is used to control the opening and closing of the debris removal window 10.

[0082] According to this embodiment, preferably, the debris removal window 10 is opened in an area where the airflow concentrates the objects remaining in the auger structure.

[0083] According to this embodiment, preferably, a display is further included; the display is connected to the control unit, and the display is used to display various data information.

[0084] According to this embodiment, preferably, there is also a function key, which is connected to the control unit; the function key is used to enter control instructions into the control unit.

[0085] According to this embodiment, preferably, the detection mechanism includes a wind speed sensor 7, an inclination sensor 8 and several groups of beam-type photoelectric switches 11;

[0086] The wind speed sensor 7 is used to detect the wind speed at the outlet of the air flow nozzle 6; the inclination sensor 8 is used to detect the angle α between the axis direction of the conveying auger and the horizontal plane; the opposing photoelectric switch 11 is used to detect whether there is any residue in the conveying auger; the wind speed sensor 7, the inclination sensor 8 and the opposing photoelectric switch 11 are respectively connected to the control unit.

[0087] According to this embodiment, preferably, the base of the airflow nozzle 6 is circular, the base is threadedly connected to the airflow hose, the middle part of the airflow nozzle 6 is an arc-shaped wall, which is used to reduce the airflow outlet area to increase the pressure, and the ratio of the middle length of the airflow nozzle 6 to the base diameter is 1:1 to 2:1. The head of the airflow nozzle 6 is also provided with a booster cylinder for further boosting the airflow to increase the airflow conveying distance, ensure the boosting effect and prevent the pressure in the airflow hose from being too high, and the ratio of the outlet area of ​​the booster cylinder to the base area is 1:4 to 1:3. A fine metal mesh is provided at the outlet of the booster cylinder to prevent residue from entering the interior of the airflow nozzle, and a metal liner is provided on the inner wall of the booster cylinder to fix the fine metal mesh. The outer shell of the airflow nozzle 6 is equipped with a rubber sleeve to ensure that the conveyed material does not leak from the gap when the conveying auger is working normally.

[0088] According to this embodiment, preferably, the diameter of the auger blade of the conveying auger is d, and the gap between the auger blade and the auger pipe is c. In order to make the residue slide to the bottom of the auger pipe so as to be cleaned by air flow, the cross section of the auger pipe is set to an arc shape, and the arc radius is In order to ensure the conveying efficiency and allow the cleaning airflow to pass through better, the value of the gap c between the auger blade and the auger pipe is set to 5-8mm.

[0089] According to the installation conditions and the cross-sectional shape of the required cleaning area, the width of the airflow nozzle is designed to be b, the outlet height is h, and b=c-1, h=2b, and c is the distance between the auger blade and the auger pipe.

[0090] According to this embodiment, preferably, when the detection mechanism detects that the angle α between the conveying auger axis and the horizontal plane is 0, in order to meet the basic requirement of thoroughly cleaning the residue, the airflow at the outlet of the airflow nozzle 6 needs to be able to move the residue in the auger pipe as a whole. Assuming that the auger pipe is in a horizontal state under a certain working condition, the critical condition for movement is that the wind force on the residue is greater than the friction force, that is:

[0091]

[0092]

[0093]

[0094] Where: C is the resistance coefficient, ρ is the air density, S1 is the cross-sectional area of ​​the residue in the auger pipe, V1 is the velocity of the airflow near the impurity discharge window, μ is the static friction coefficient between the residue and the inner wall of the auger pipe, m is the mass of the residue, g is the acceleration of gravity, R is the arc radius of the horizontal auger pipe, β is half of the central angle of the horizontal auger pipe arc chord length, combined with Figure 10 As shown;

[0095] The theoretical outlet velocity V0 of the airflow nozzle is:

[0096]

[0097] in:

[0098]

[0099] Where: V m is the axial velocity of the cleaning airflow near the impurity removal window, a is the turbulence coefficient, s is the horizontal distance between the airflow nozzle and the impurity removal window; h is the height of the airflow nozzle outlet, y is the vertical distance between the impurity removal window and the central axis of the cleaning airflow,

[0100] f is the jet half height of the airflow section near the impurity removal window, which is calculated by the following formula:

[0101] f=2.44(as+0.41b0)

[0102] b0 is the half height of the airflow nozzle outlet, b0 = 1 / 2h;

[0103] Combining the above formulas 1, 2, and 3, we can get the theoretical outlet velocity V0 of the airflow nozzle in the horizontal state, which must satisfy:

[0104]

[0105] According to this embodiment, preferably, when the detection mechanism detects that the angle α between the conveying auger axis and the horizontal plane is greater than 0, the wind force on the residue should be greater than the sum of the friction force on the residue and the gravity component force in the above-mentioned axis direction, that is:

[0106]

[0107] Combining the above formulas 4 and 5, the theoretical outlet wind speed V of the airflow nozzle in the tilted state is 0α Need to meet:

[0108]

[0109] Combine Figure 9 As shown, a control method of the auger-type conveying mechanism with an airflow cleaning device according to the present invention comprises the following steps:

[0110] The detection mechanism detects the outlet wind speed of the airflow nozzle 601, the angle α between the axis of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmits the information to the control unit;

[0111] The control unit controls the debris removal window 10 and the centrifugal fan module 4 to open. The control unit calculates the theoretical outlet wind speed based on the angle α between the axis of the conveying auger and the horizontal plane. When the actual outlet wind speed of the airflow nozzle 6 is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module 4 to increase the wind speed. After the debris removal window 10 is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger. If there is any residue, the control unit controls the centrifugal fan module 4 to increase the wind speed. If there is no residue, the control unit controls the debris removal window 10 to close.

[0112] Example 2

[0113] A harvester includes the airflow cleaning auger-type conveying mechanism described in Example 1, and thus has the beneficial effects of Example 1, which will not be repeated here.

[0114] Figure 1 This is a preferred embodiment of the auger-type conveying mechanism with an airflow cleaning device described in the present invention. According to this embodiment, the conveying auger is preferably a grain unloading auger 2; the grain unloading auger 2 includes a horizontal auger 201, an auger elbow 202, and a vertical lifting auger 203; the horizontal auger 201 is connected to the vertical lifting auger 203 via the auger elbow 202; the horizontal auger 201 is disposed at the bottom of the grain tank 1; and the debris removal window 10 is disposed at the auger elbow 202.

[0115] According to this embodiment, preferably, the bottom of the grain tank 1 is connected by two inclined side plates 101 and a horizontal auger pipe 102 with an arc-shaped cross section. Figure 1 and Figure 2 As shown, the horizontal auger 201 includes auger blades and a horizontal auger pipe 102. The auger blades are installed in the horizontal auger pipe 102, and the two cooperate to transport grain. The vertical side panels of the grain tank 1 are provided with movable chutes, and the centrifugal fan module 4 is hung on the side panels of the grain tank 1 via the movable chutes. Preferably, in this embodiment, the debris discharge window 10 is arranged at the bottom of the auger elbow 202.

[0116] According to this embodiment, preferably, the diameter of the auger blade is d, and the gap between the auger blade and the horizontal auger pipe 102 is c. In order to make the residue slide to the bottom of the horizontal auger pipe 102 so as to be cleaned by air flow, the cross section of the horizontal auger pipe 102 is set to an arc shape, and the arc radius is In order to ensure the conveying efficiency and allow the cleaning airflow to pass through better, the value of the gap c between the horizontal auger blade and the horizontal auger pipe 102 is set to 5-8 mm.

[0117] Combine Figures 3 to 8 As shown, according to this embodiment, preferably, an air separator 5 is further included; one end of the air separator 5 and the other end of the centrifugal fan module 4 are connected to one end of the air flow nozzle 6 through an air flow hose.

[0118] According to this embodiment, preferably, there are six air flow nozzles 6 in the grain tank, including a first air flow nozzle 601, a second air flow nozzle 602, a third air flow nozzle 603, a fourth air flow nozzle 604, a fifth air flow nozzle 605 and a sixth air flow nozzle 606;

[0119] The first air flow nozzle 601 is arranged at one end below the horizontal auger 201 near the vertical side panel of the grain tank 1, the second air flow nozzle 602 and the third air flow nozzle 603 are respectively installed in the horizontal auger pipe 102 at the bottom of the grain tank 1, the fourth air flow nozzle 604 is installed on the inside of the auger elbow 202, the fifth air flow nozzle 605 and the sixth air flow nozzle 606 are respectively installed in the middle and top of the vertical lifting auger 203, and small openings are opened at the bottom of the vertical side panel of the grain tank 1, the two inclined side panels of the grain tank 1, one side of the auger elbow 202, and the middle and top of the vertical lifting auger 203 for installing the air flow nozzle 6; preferably, in order to make the air flow nozzle 6 cooperate more closely with the grain tank 1, the auger elbow 202 and the vertical lifting auger 203, and to ensure that the conveyed material does not leak from the gap when the conveying auger is working normally, the outer shell of the air flow nozzle 6 is equipped with a rubber sleeve.

[0120] The air separator 5 includes a first-level air separator 501 and two second-level air separators 502; one end of the first-level air separator 501 is connected to the centrifugal fan module 4, and the other end is connected to the second-level air separator 502 through an air flow hose. One second-level air separator 502 is connected to the first air flow nozzle 601, the second air flow nozzle 602, and the third air flow nozzle 603 through an air flow hose, and the other second-level air separator 502 is connected to the fourth air flow nozzle 604, the fifth air flow nozzle 605, and the sixth air flow nozzle 606 through an air flow hose.

[0121] According to this embodiment, preferably, the duct-type wind speed sensor 7 is arranged at the outlet of the first airflow nozzle 601, and is used to detect the wind speed at the outlet of the first airflow nozzle 601 and feed it back to the control unit;

[0122] The inclination sensor 8 is arranged at the bottom of the grain tank 1, and is used to detect the angle α between the bottom of the grain tank 1 and the horizontal plane in the direction of the axis of the horizontal auger 201 and transmit the information to the control unit;

[0123] The through-beam photoelectric switch 11 is divided into a transmitting end 1101 and a receiving end 1102. The transmitting end 1101 is arranged at the bottom end of the auger elbow 202, and the receiving end 1102 is arranged at the bottom of the grain tank 1. The transmitting end 1101 and the receiving end 1102 are at the same horizontal height, and the connecting line passes through the gap between the horizontal auger pipe 102 and the horizontal auger blades. It is used to detect whether there is any residue in the horizontal auger pipe 102 and the auger elbow 202. Multiple groups of the through-beam photoelectric switches 11 can be arranged to expand the detection range.

[0124] The electric push rod 9 is arranged below the horizontal auger pipe 102 and close to the debris discharge window 10, and is used to control the automatic opening and closing of the debris discharge window 10. The debris discharge window 10 is connected to the auger elbow 202 through a hinge to form a rotating pair; the telescopic rod of the electric push rod 9 is connected to the debris discharge window 10 through a support to form a rotating pair; the base of the electric push rod 9 is connected to the horizontal auger pipe 102 through a support to form a rotating pair; the extension or retraction of the electric push rod 9 is controlled by the control unit. When the electric push rod 9 is extended, the debris discharge window 10 gradually closes, and when the electric push rod 9 is retracted, the debris discharge window 10 gradually opens.

[0125] Based on the installation conditions and the cross-sectional shape of the required cleaning area, the first airflow nozzle 601 is designed to have a width of b and an outlet height of h, where b=c-1, h=2b, and c is the distance between the horizontal auger blade and the horizontal auger pipe. Preferably, in order to meet the basic requirement of thoroughly cleaning the residue, the wind speed at the outlet of the first airflow nozzle must be able to move the residue in the horizontal auger pipe 102 as a whole. Assuming that the horizontal auger pipe 102 is in a horizontal state under certain working conditions, the critical condition for movement is that the wind force on the residue is greater than the friction force, that is:

[0126]

[0127] in:

[0128]

[0129]

[0130] Where: C is the drag coefficient, which is 0.44; ρ is the air density, which is 1.25 kg / m 3 ; S1 is the cross-sectional area of ​​the residue in the horizontal auger pipe, mm 2 ; V1 is the velocity of the air flow near the impurity discharge window, m / s; μ is the static friction coefficient between the residue and the inner wall of the horizontal auger pipe; m is the mass of the residue, g; g is the acceleration of gravity, taken as 9.81m / s 2 ; R is the arc radius of the horizontal auger pipe, mm; β is half the chord length of the horizontal auger pipe arc corresponding to the central angle, combined Figure 10 shown.

[0131] According to the dimensionless velocity distribution formula on each cross section of the jet radius in the principle of gas jet dynamics, when the auger conveying mechanism is in a horizontal state, the theoretical outlet wind speed V0 of the first airflow nozzle is:

[0132]

[0133] in:

[0134]

[0135] Where: V m is the axial velocity of the cleaning airflow near the impurity removal window, m / s; a is the turbulence coefficient related to the airflow shape, which is taken as 0.108 here; s is the horizontal distance between the first airflow nozzle and the impurity removal window, mm; h is the outlet height of the first airflow nozzle, mm; y is the vertical distance between the impurity removal window and the central axis of the cleaning airflow, mm.

[0136] f is the jet half height of the airflow section near the impurity removal window, mm, which can be calculated by the following formula:

[0137] f=2.44(as+0.41b0)

[0138] Combining the above formulas 1, 2, and 3, it can be obtained that the theoretical outlet wind speed V0 of the first airflow nozzle must satisfy:

[0139]

[0140] If the angle between the horizontal auger 201 and the horizontal plane in the axial direction is α>0 under certain working conditions, that is, the auger has become an inclined auger, then the wind force on the residue should be greater than the sum of the friction force on the residue and the gravity component force in the axial direction, that is:

[0141]

[0142] When the auger conveying mechanism is in an inclined state, combined with the above formulas 4 and 5, the actual outlet wind speed V of the first airflow nozzle is: 0α Need to meet:

[0143]

[0144] The working process of this implementation is as follows:

[0145] After a transport operation, the auger blades of the auger-type conveying mechanism stop rotating, and the control unit controls the electric push rod 9 to retract. At this time, the debris discharge window 10 opens, and at the same time, the control unit receives the inclination angle α of the horizontal auger 201 transmitted by the inclination sensor 8, calculates the theoretical outlet wind speed of the first airflow nozzle 601 suitable for this working condition, and then converts it into the blade speed N of the centrifugal fan, and transmits the speed N signal to the centrifugal fan module 4. At this time, the centrifugal fan runs to release the airflow, and then the control unit receives the wind speed V1 at the outlet of the first airflow nozzle 601 transmitted by the duct-type wind speed sensor 7, and adjusts the centrifugal fan blade speed N. If the actual outlet wind speed V1 is less than the theoretical outlet wind speed calculated above, the blade speed N is increased; if it is greater than the theoretical outlet wind speed, the blade speed N is reduced. Preferably, it is greater than the theoretical outlet wind speed 1 0%, the blade speed N is reduced. At this time, the airflow released by the centrifugal fan is divided into two streams through the first-level air separator 501, and then transmitted to two second-level air separators 502 through the airflow hose. The two second-level air separators 502 each divide one airflow into three streams, and finally the airflow is transmitted to six airflow nozzles 6 through the airflow hose to clean the bottom of the horizontal auger 201 pipe, the inclined side plate of the grain box 1, the inside of the auger elbow 202 and the upper surface of the vertical lifting auger 203 blade, and then concentrated to the impurity discharge window 10 for discharge. After working for a period of time, the reflected photoelectric switch 11 transmits a detection signal. If the light transmitted by the reflected photoelectric switch 11 is not blocked, it proves that the cleaning is completed. At this time, the control unit issues an end command, each device stops working, and the electric push rod 9 is extended. At this time, the impurity discharge window 10 is closed, and the unloading auger can continue to unload the grain. If the light transmitted by the through-beam photoelectric switch 11 is blocked, the control unit controls the centrifugal fan to increase the blade speed, preferably by 20%. After a period of time, if the light transmitted by the through-beam photoelectric switch 11 is still blocked, a prompt is given through the display.

[0146] The harvester described in this embodiment uses a conveying auger to clean the residues in the auger mechanism through positive pressure airflow cleaning, thereby improving the self-cleaning ability of the harvester, greatly improving the cleaning efficiency of the machine, overcoming the high power consumption in the negative pressure cleaning state, and the requirements of a highly sealed working environment, and is more versatile.

[0147] In this embodiment, an inclination sensor is set to collect the inclination angle between the horizontal auger and the horizontal plane in real time, and a duct-type wind speed sensor collects the airflow outlet wind speed in real time. The centrifugal fan module adjusts the fan blade speed accordingly to ensure that the auger mechanism has a stable cleaning effect under different working conditions; a through-beam photoelectric switch is used to detect in real time whether there is any residue at the bottom of the horizontal auger pipe and the bottom of the auger elbow, replacing the current detection method of manual observation, making the detection more automated; the residue in the auger mechanism is cleaned by positive pressure airflow, thereby improving the self-cleaning ability of the harvester, which can greatly improve the cleaning efficiency of the machine, overcome the high power consumption in the negative pressure cleaning state, and overcome the requirements of a high airtight working environment, and is more versatile.

[0148] Example 3

[0149] A conveying device includes the airflow cleaning auger-type conveying mechanism described in Example 1, and thus has the beneficial effects of Example 1, which will not be repeated here.

[0150] The single-stage conveying auger of the present invention can be divided into horizontal auger, inclined auger and vertical lifting auger according to the layout angle. The scope of the conveying auger of the present invention includes all conveying mechanisms with auger form and all conveying auger mechanisms and their matching parts contained in equipment with auger-type conveying mechanisms, including but not limited to the harvester auger, grain conveying auger, miscellaneous auger, grain unloading auger, and conveying auger of thresher. The present invention uses the grain unloading auger of a combine harvester as an example to illustrate the layout and use of the airflow cleaning device. Other types of conveying auger mechanisms are also within the scope of application of the present invention.

[0151] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0152] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An airflow cleaning auger-type conveying mechanism, characterized in that: It includes a conveying auger, a detection mechanism, a centrifugal fan module (4), an air flow nozzle (6) and a control unit; The centrifugal fan module (4) is connected to one end of the airflow nozzle (6), and the other end of the airflow nozzle (6) is connected to the conveying auger, and the conveying auger is also provided with a debris discharge window (10); The detection mechanism is used to detect the actual outlet wind speed of the airflow nozzle (6), the angle α between the axis direction of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmit them to the control unit; The control unit is connected to the detection mechanism, the centrifugal fan module (4) and the debris removal window (10) respectively; the control unit controls the debris removal window (10) and the centrifugal fan module (4) to open, and the control unit calculates the theoretical outlet wind speed according to the angle α between the axis direction of the conveying auger and the horizontal plane; when the actual outlet wind speed of the airflow nozzle (6) is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module (4) to increase the wind speed; after the debris removal window (10) is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger; if there is any residue, the control unit controls the centrifugal fan module (4) to increase the wind speed; if there is no residue, the control unit controls the debris removal window (10) to close; When the detection mechanism detects that the angle between the conveying auger axis and the horizontal plane is α=0, The airflow at the outlet of the air nozzle (6) must be able to move the residue in the auger pipe as a whole. Assuming that the auger pipe is in a horizontal state under certain working conditions, the critical condition for movement is that the wind force on the residue is greater than the friction force, that is: Where: C is the resistance coefficient, ρ is the air density, S1 is the cross-sectional area of ​​the residue in the auger pipe, V1 is the velocity of the airflow near the impurity discharge window, μ is the static friction coefficient between the residue and the inner wall of the auger pipe, m is the mass of the residue, g is the acceleration of gravity, R is the radius of the horizontal auger pipe arc, and β is half of the central angle of the horizontal auger pipe arc corresponding to the chord length. The theoretical outlet velocity V0 of the airflow nozzle is: in: Where: V m is the axial velocity of the cleaning airflow near the impurity removal window, a is the turbulence coefficient, s is the horizontal distance between the airflow nozzle and the impurity removal window; h is the height of the airflow nozzle outlet, y is the vertical distance between the impurity removal window and the central axis of the cleaning airflow, f is the jet half height of the airflow section near the impurity removal window, which is calculated by the following formula: f=2.44(as+0.41b0) b0 is the half height of the airflow nozzle outlet, b0 = 1 / 2h; Combining the above formulas 1, 2, and 3, we can get the theoretical outlet velocity V0 of the airflow nozzle in the horizontal state, which must satisfy: When the detection mechanism detects that the angle α between the conveying auger axis and the horizontal plane is greater than 0, the wind force on the residue should be greater than the sum of the friction force on the residue and the gravity component force in the above axis direction, that is: Combining the above formulas 4 and 5, the theoretical outlet wind speed V of the airflow nozzle in the tilted state is 0α Need to meet:

2. The airflow cleaning auger-type conveying mechanism according to claim 1, characterized in that: The detection mechanism includes a wind speed sensor (7), an inclination sensor (8) and several groups of opposing photoelectric switches (11); The wind speed sensor (7) is used to detect the wind speed at the outlet of the airflow nozzle (6); the tilt sensor (8) is used to detect the angle α between the axis direction of the conveying auger and the horizontal plane; the opposing photoelectric switch (11) is used to detect whether there is any residue in the conveying auger; the wind speed sensor (7), the tilt sensor (8) and the opposing photoelectric switch (11) are respectively connected to the control unit; It also includes an electric push rod (9); the electric push rod (9) is connected to the debris removal window (10); the control unit is connected to the electric push rod (9); and the electric push rod (9) is used to control the opening and closing of the debris removal window (10).

3. The airflow cleaning auger type conveying mechanism according to claim 1, characterized in that: The base of the airflow nozzle (6) is circular and connected to the airflow hose. The middle part of the airflow nozzle (6) is an arc-shaped wall. The ratio of the middle length of the airflow nozzle (6) to the base diameter is 1:1 to 2:

1. The head of the airflow nozzle (6) is also provided with a booster cylinder. The ratio of the outlet area of ​​the booster cylinder to the base area is 1:4 to 1:

3. A fine metal mesh is provided at the outlet of the booster cylinder.

4. A conveying device, characterized in that: It comprises the airflow cleaning auger-type conveying mechanism according to any one of claims 1-3.

5. A harvester, characterized in that: It comprises the airflow cleaning auger-type conveying mechanism according to any one of claims 1-3.

6. The harvester according to claim 5, characterized in that The conveying auger is a harvesting platform auger, a grain conveying auger, a miscellaneous auger, a grain unloading auger or a threshing auger.

7. The harvester according to claim 6, characterized in that The conveying auger is a grain unloading auger (2); the grain unloading auger (2) comprises a horizontal auger (201), an auger elbow (202) and a vertical lifting auger (203); the horizontal auger (201) is connected to the vertical lifting auger (203) via the auger elbow (202); the horizontal auger (201) is arranged at the bottom of the grain box (1); and the debris discharge window (10) is arranged at the auger elbow (202).

8. The harvester according to claim 7, characterized in that: The grain tank air flow nozzles (6) are six, including a first air flow nozzle (601), a second air flow nozzle (602), a third air flow nozzle (603), a fourth air flow nozzle (604), a fifth air flow nozzle (605) and a sixth air flow nozzle (606); The first air flow nozzle (601) is arranged at one end of the vertical side plate of the grain box (1) below the horizontal auger (201), the second air flow nozzle (602) and the third air flow nozzle (603) are respectively installed in the horizontal auger pipe (102) at the bottom of the grain box (1), the fourth air flow nozzle (604) is installed on the inside of the auger elbow (202), the fifth air flow nozzle (605) and the sixth air flow nozzle (606) are respectively installed in the middle and top of the vertical lifting auger (203), and small openings are opened at the bottom of the vertical side plate of the grain box (1), the two inclined side plates of the grain box (1), one side of the auger elbow (202), and the middle and top of the vertical lifting auger (203) for installing the air flow nozzles (6); The invention also includes an air separator (5); the air separator (5) includes a first-level air separator (501) and two second-level air separators (502); one end of the first-level air separator (501) is connected to the centrifugal fan module (4), and the other end is connected to the second-level air separators (502) through air flow hoses; one second-level air separator (502) is connected to the first air flow nozzle (601), the second air flow nozzle (602), and the third air flow nozzle (603) through the air flow hoses; the other second-level air separator (502) is connected to the fourth air flow nozzle (604), the fifth air flow nozzle (605), and the sixth air flow nozzle (606) through the air flow hoses.

9. A control method for an airflow cleaning auger-type conveying mechanism according to any one of claims 1 to 3, characterized in that: The following steps are involved: The detection mechanism detects the wind speed at the outlet of the airflow nozzle (6), the angle α between the axis of the conveying auger and the horizontal plane, and whether there is any residue in the conveying auger, and transmits the information to the control unit; The control unit controls the opening of the debris removal window (10) and the centrifugal fan module (4). The control unit calculates the theoretical outlet wind speed according to the angle α between the axis direction of the conveying auger and the horizontal plane. When the actual outlet wind speed of the airflow nozzle (6) is less than the theoretical outlet wind speed, the control unit controls the centrifugal fan module (4) to increase the wind speed. After the debris removal window (10) is opened for a preset time, the detection mechanism detects whether there is any residue in the conveying auger. If there is any residue, the control unit controls the centrifugal fan module (4) to increase the wind speed. If there is no residue, the control unit controls the closing of the debris removal window (10).

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