A two-stage cylinder screen cleaning device and control method and harvester

Abstract

The application provides a double-section cylinder sieve cleaning device and control method and a harvester, which comprises a cylinder sieve, a driving system and a frame; the cylinder sieve is installed on the frame and surrounds the cylinder and the concave sieve to clean the mixed rice; the cylinder sieve comprises a front half section sieve and a rear half section sieve which are coaxially arranged; the driving system is connected with the front half section sieve and the rear half section sieve to drive the rotation of the front half section sieve and the rear half section sieve respectively. The application can complete the high-efficiency cleaning of the mixed rice at a low amplitude, reduce the loss of grain cleaning, reduce the impurity content and effectively improve the reliability of the combine harvester. The application can adjust the screen gap of the cylinder sieve and the rotation speed of the front half section sieve and the rear half section sieve according to the feeding amount, further improve the cleaning efficiency, simplify the traditional cleaning structure such as the fan and the return plate and improve the space utilization rate and the rice cleaning efficiency of the combine harvester.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural harvesting machinery, and particularly relates to a double-section cylinder sieve cleaning device, a control method and a harvester. BACKGROUND

[0002] In the field of harvesting machinery, the cleaning device is a core component of the grain combine harvester, which is used to separate and remove stems and residues in the grain, and its cleaning performance directly affects the working effect of the combine harvester in the field. Improving the cleaning efficiency is crucial to the overall performance improvement of the harvesting machinery. However, the content of broken stems and broken rice leaves in the rice stripping mixture is too high, the mass ratio of grains to residues in the rice stripping mixture is nearly 3:1, and the volume ratio of grains to residues is 1:3-1:4, so it is difficult to clean the rice stripping mixture with high impurity content.

[0003] In order to reduce the vibration of the cleaning device on the overall combine harvester and achieve high-efficiency cleaning of the rice stripping mixture with high impurity content, the prior art has made a series of designs based on the optimization of the flat sieve structure, but still cannot avoid the problem of large vibration. In order to reduce vibration, some also use a cylindrical sieve to clean the rice stripping material. The rotary motion characteristics greatly reduce the vibration of the cleaning device. The prior art discloses a rice threshing and cleaning device, which mainly includes a device housing, a threshing drum, a cylindrical sieve and a cleaning fan. The device is miniaturized and compact, and can be used on a combine harvester. However, the existing technology directly changes the original concave sieve into a cylindrical sieve, which causes the material to only pass through one layer of sieve surface for cleaning after the threshing drum threshes, resulting in high impurity content.

[0004] However, the current traditional rice combine harvester widely uses a fan to cooperate with a double-layer or multi-layer vibrating sieve to clean the grain stripping material. Since the driving mode adopts a connecting rod reciprocating mechanism, the flat sieve driven by the connecting rod reciprocating motion faces the problem of large vibration amplitude, which cannot be solved in actual work. In addition, due to the different growth densities of rice in the field, the feeding amount of the harvester fluctuates, which easily causes uneven distribution and blockage of the material in the sieve. However, the existing cleaning device cannot adjust in real time according to the amount of material in the sieve, which leads to instability in the cleaning process, reduces the cleaning efficiency, and increases the complexity of operation and the trouble of manual intervention. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a double-section cylinder sieve cleaning device, which can complete efficient cleaning of rice outflow at low amplitude, reduce grain cleaning loss, reduce impurity content, and effectively improve the reliability of the combine harvester. The present application can adjust the screen gap of the cylinder sieve and the rotation speed of the front half section and the rear half section according to the feeding amount, further improving the cleaning efficiency. The present application also simplifies the traditional cleaning structure of the fan, return plate, etc., improving the space utilization rate and rice cleaning efficiency inside the combine harvester.

[0006] The present application also provides a control method for the gap-adjustable double-section cylinder sieve cleaning device.

[0007] The present application also provides a harvester comprising the gap-adjustable double-section cylinder sieve cleaning device.

[0008] The present application achieves the above technical objectives through the following technical means.

[0009] A double-section cylinder sieve cleaning device, comprising a cylinder sieve, a driving system, and a frame; the cylinder sieve is installed on the frame and surrounds the cylinder and the concave sieve, and is used for cleaning the mixed rice outflow; the cylinder sieve comprises a separated front half section and a rear half section, the front half section and the rear half section are coaxially arranged, the driving system is connected with the front half section and the rear half section respectively, and is used for driving the front half section and the rear half section to rotate respectively.

[0010] In the above scheme, the cylinder sieve comprises two supporting wheels, two spiral conveying plates, a plurality of rib plates, two screen meshes, a bracket, a first sliding rail and a second sliding rail; the two spiral conveying plates are coaxially arranged; a plurality of mutually parallel rib plates are uniformly distributed around each spiral conveying plate; the spiral conveying plate is connected with the rib plate; the two ends of the rib plate are respectively provided with annular frames; each spiral conveying plate coaxially sleeves a screen mesh; the first sliding rail is arranged at the front end of the rear half section and connected with the annular frame at the front end of the rear half section; the second sliding rail is arranged at the rear end of the front half section and connected with the annular frame at the rear end of the front half section; the two supporting wheels are installed on the frame; one supporting wheel is connected with the first sliding rail, and the other supporting wheel is connected with the second sliding rail; one side of the bracket is connected with the screen mesh, and the other side is connected with a slip ring on the main shaft of the cylinder, and is used for supporting the screen mesh.

[0011] Further, the cylinder sieve further comprises two sets of gap adjustment devices; one set of gap adjustment devices is arranged at the front end of the front half section and connected with the annular frame at the front end of the front half section; the other set of gap adjustment devices is arranged at the rear end of the rear half section and connected with the annular frame at the rear end of the rear half section; the gap adjustment device is connected with the frame through a first thin-wall bearing, and is connected with the driving system, and is used for adjusting the gap of the screen mesh.

[0012] Further, the gap adjusting device comprises a gap adjusting gear, a gear ring, a first pinion, a second pinion and a limiting slot.

[0013] The gap adjusting gear is engaged with the external teeth of the gear ring for driving the gear ring to rotate; the first pinion is connected with the screen and engaged with the internal teeth of the gear ring for driving the screen to rotate; the second pinion is connected with the screen and engaged with the internal teeth of the gear ring for driving the screen to rotate; the limiting slot is arranged on the annular frame for limiting the moving range of the screen; the outer ring of the second thin-wall bearing is connected with the gear ring and the inner ring is connected with the annular frame for supporting the gear ring to rotate.

[0014] Further, the screen comprises a first spiral strip, a second spiral strip, a third spiral strip and a fourth spiral strip; the ends of the second spiral strip and the fourth spiral strip are respectively connected with the annular frame; the ends of the first spiral strip and the third spiral strip are located in the limiting slot of the annular frame; the first pinion is connected with the first spiral strip for driving the first spiral strip to rotate; the second pinion is connected with the third spiral strip for driving the third spiral strip to rotate; the annular frame has two limiting slots on the upper surface, and the ends of the first spiral strip and the third spiral strip are respectively located in the limiting slots for limiting the moving range of the first spiral strip and the third spiral strip respectively.

[0015] In the above scheme, the driving system comprises a first driving motor, a second driving motor, a first gap adjusting motor and a second gap adjusting motor; the first driving motor is tightly attached to the rear half screen for driving the rear half screen of the cylinder screen to rotate; the second driving motor is tightly attached to the front half screen for driving the front half screen of the cylinder screen to rotate; the main shaft of the first gap adjusting motor is matched with the gap adjusting gear of the rear half screen of the cylinder screen for driving the gap adjusting gear of the rear half screen to rotate; the main shaft of the second gap adjusting motor is matched with the gap adjusting gear of the front half screen of the cylinder screen for driving the gap adjusting gear of the front half screen to rotate.

[0016] In the above scheme, it further comprises a feeding amount sensor and a control system; the control system is connected with the feeding amount sensor and the driving system respectively; the feeding amount sensor is located on the threshing cylinder main shaft for monitoring the feeding amount in the cleaning device and transmitting to the control system; the control system compares the feeding amount detected by the feeding amount sensor with the preset value to judge the blocking condition of the material in the screen; if the feeding amount is greater than the preset value, there is a blockage in the screen, otherwise it is normal; if there is a blockage in the screen, the control system controls the driving system to drive the gap adjusting device to adjust the rotating speed of the front half screen and the rear half screen of the cylinder screen and the size of the screen gap of the cylinder screen.

[0017] A control method of the double-section cylinder screen cleaning device, comprising the following steps:

[0018] After the threshing process is completed between the threshing cylinder and the concave sieve, the grains and the stems and residues passing through the concave sieve enter the cylindrical sieve, the driving system drives the cylindrical sieve to rotate, so that the rotating speed of the front half of the cylindrical sieve is v1, the layering and separation of the grains and the stems in the sieve are realized by rotation, the stems and residues separated by the front half of the sieve enter the rear half of the cylindrical sieve, the driving system drives the rear half of the sieve to rotate at a speed of v2, and v2>v1, because of the speed difference, the separation angle of the grains and the stems changes, and after the grains and the stems in the cleaned material are fully separated, the stems and residues are discharged from the tail of the cylindrical sieve;

[0019] In the above scheme, the following steps are further included: a feeding amount sensor monitors the feeding amount in the cleaning device and transmits the feeding amount to a control system, when the feeding amount suddenly changes or winding in the sieve occurs, the feeding amount detected by the feeding amount sensor exceeds a preset feeding amount threshold, the control system judges that clogging occurs in the cylindrical sieve, and controls the driving system to adjust the rotating speed of the cylindrical sieve and the screen gap size of the cylindrical sieve.

[0020] A harvester comprising the double-section cylindrical sieve cleaning device.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The double-section cylindrical sieve cleaning device, aiming at the problem of large vibration and easy to cause faults of the commonly used connecting rod type cleaning sieve, designs a rice cleaning cylindrical sieve device, places the double-section cylindrical sieve body around the threshing cylinder, and the front half of the sieve and the rear half of the sieve can directly clean the threshed mixture at different rotating speeds, the rotary motion greatly reduces the vibration of the cleaning device compared with the connecting rod type motion, the present application can complete high-efficiency cleaning of the threshed mixture of rice at low amplitude, reduces the loss of grain cleaning, reduces the impurity rate, effectively improves the reliability of the combine harvester, simplifies the traditional cleaning structure such as the fan and the return plate, and improves the space utilization rate and the rice cleaning efficiency inside the combine harvester.

[0023] 2. The double-section cylindrical sieve cleaning device, aiming at the problem that the growth of rice in the field is different in density, thereby causing the change of feeding amount, monitors the feeding amount in the cleaning device through a feeding amount sensor and transmits the feeding amount to a control system, when the feeding amount suddenly changes or winding in the sieve occurs, the feeding amount detected by the feeding amount sensor exceeds a preset feeding amount threshold, the control system judges that clogging occurs in the cylindrical sieve, and controls the driving system to adjust the rotating speed of the cylindrical sieve and the screen gap size of the cylindrical sieve, realizes the function of adjusting the rotating speed and the screen gap size in real time according to the feeding amount and the clogging condition in the sieve, and the functions of real-time adjustment of the screen gap and adjustment of the rotating speed of the two sections of the sieve further ensure high-efficiency cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced below. The accompanying drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 Structure schematic diagram of the track-type combine harvester with the double-section cylinder screen cleaning device according to an embodiment of the present application.

[0026] Figure 2 Structure schematic diagram of the double-section cylinder screen cleaning device according to an embodiment of the present application.

[0027] Figure 3 Front view of the cylinder screen frame according to an embodiment of the present application.

[0028] Figure 4 Left view of the cylinder screen installation according to an embodiment of the present application.

[0029] Figure 5 Left view of the gap adjustment device according to an embodiment of the present application.

[0030] Figure 6 Left view of the ring frame according to an embodiment of the present application.

[0031] Figure 7 Schematic diagram of the screen mesh according to an embodiment of the present application.

[0032] Figure 8 Motor drive control schematic diagram according to an embodiment of the present application.

[0033] Figure 9 Discrete element simulation test result diagrams of the front half section screen at different rotating speeds according to an embodiment of the present application, wherein Figure 9 (a) is a discrete element simulation test result diagram at 34 r / min, Figure 9 (b) is a discrete element simulation test result diagram at 36 r / min, Figure 9 (c) is a discrete element simulation test result diagram at 38 r / min, Figure 9 (d) is a discrete element simulation test result diagram at 40 r / min.

[0034] Figure 10 Discrete element simulation test result diagrams of the rear half section screen at different rotating speeds according to an embodiment of the present application, Figure 10 (a) is a discrete element simulation test result diagram at 41 r / min, Figure 10 (b) is a discrete element simulation test result diagram at 43 r / min, Figure 10(c) is a discrete element simulation test result graph at 45 r / min, Figure 10 (d) is a discrete element simulation test result graph at 47 r / min.

[0035] Figure 11 Fig. 1 is a schematic diagram of a working condition A of a cylindrical screen according to an embodiment of the present application.

[0036] Figure 12 Fig. 2 is a schematic diagram of a working condition B of a cylindrical screen according to an embodiment of the present application.

[0037] Figure 13 Fig. 3 is a schematic diagram of a gap and rotating speed control of a cylindrical screen according to an embodiment of the present application.

[0038] In the figure: 1 - cylindrical screen; 101 - support wheel; 102 - spiral conveying plate; 103 - rib plate; 104 - gap adjusting device; 1041 - gap adjusting gear; 1042 - gear ring; 1044 - first pinion; 1045 - second pinion; 1046 - limiting groove; 105 - screen mesh; 1051 - first spiral strip; 1052 - second spiral strip; 1053 - third spiral strip; 1054 - fourth spiral strip; 106 - support; 107 - first thin-wall bearing; 108 - second thin-wall bearing; 109 - first sliding rail; 1010 - second sliding rail; 1011 - annular frame; 2 - driving system; 201 - first driving motor; 202 - second driving motor; 203 - first gap adjusting motor; 204 - second gap adjusting motor; 3 - rack; 4 - feeding amount sensor. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] As shown in Figure 1 and 2 A double-section cylinder sieve cleaning device, comprising a cylinder sieve 1, a driving system 2 and a frame 3; the cylinder sieve 1 is mounted on the frame 3 and surrounds the around the threshing cylinder and the concave sieve, used for cleaning the threshed rice mixture; the cylinder sieve 1 comprises a separate front half section sieve and a rear half section sieve, the front half section sieve and the rear half section sieve are coaxially arranged front and rear, the driving system 2 is connected with the front half section sieve and the rear half section sieve respectively, used for driving the front half section sieve and the rear half section sieve to rotate respectively.

[0043] As shown in Figures 2-4As shown, the cylindrical screen 1 comprises two support wheels 101, two spiral conveying plates 102, a plurality of rib plates 103, two screen meshes 105, a support 106, a first sliding rail 109 and a second sliding rail 1010; the two spiral conveying plates 102 are coaxially arranged front to back, a plurality of mutually parallel rib plates 103 are uniformly distributed around each spiral conveying plate 102, the spiral conveying plate 102 is connected with the rib plate 103, and the two ends of the rib plate 103 are respectively provided with annular frames 1011; each spiral conveying plate 102 coaxially sleeves a screen mesh 105, the first sliding rail 109 is arranged at the front end of the rear half screen and connected with the annular frame 1011 at the front end of the rear half screen, and the second sliding rail 1010 is arranged at the rear end of the front half screen and connected with the annular frame 1011 at the rear end of the front half screen; the two support wheels 101 are installed on the rack 3, one support wheel 101 is connected with the first sliding rail 109, and the other support wheel 101 is connected with the second sliding rail 1010; one side of the support 106 is connected with the screen mesh 105, and the other side is connected with a slip ring on the threshing cylinder main shaft, for supporting the screen mesh 105.

[0044] The cylindrical screen 1 further comprises two sets of gap adjusting devices 104; one set of gap adjusting devices 104 is arranged at the front end of the front half screen and connected with the annular frame 1011 at the front end of the front half screen; the other set of gap adjusting devices 104 is arranged at the rear end of the rear half screen and connected with the annular frame 1011 at the rear end of the rear half screen; the gap adjusting device 104 is connected with the rack 3 through a first thin-wall bearing 107, and the gap adjusting device 104 is connected with the driving system 2, for adjusting the gap of the screen mesh 105.

[0045] The double-section cylindrical screen cleaning device of the application, in view of the different requirements of cleaning for different contents of grains in the mixture threshed by the threshing cylinder, designs a double-section cylindrical screen, i.e. coaxially arranging a front half screen and a rear half screen front to back, determining different rotating speeds of the front half screen and the rear half screen and sizes of the screen meshes, and improving the rice cleaning efficiency.

[0046] As shown in Figures 5-6 The gap adjusting device 104 comprises a gap adjusting gear 1041, a gear ring 1042, a first pinion 1044, a second pinion 1045 and a limiting groove 1046; the gap adjusting gear 1041 is engaged with the outer teeth of the gear ring 1042, for driving the gear ring 1042 to rotate; the first pinion 1044 is connected with the screen mesh 105 and engaged with the inner teeth of the gear ring 1042, for driving the screen mesh 105 to rotate; the second pinion 1045 is connected with the screen mesh 105 and engaged with the inner teeth of the gear ring 1042, for driving the screen mesh 105 to rotate; the annular frame 1011 is provided with the limiting groove 1046, for limiting the moving range of the screen mesh 105; the outer ring of the second thin-wall bearing 108 is connected with the gear ring 1042, and the inner ring 1042 is connected with the annular frame 1011, for supporting the gear ring 1042 to rotate.

[0047] As Figure 6 shown, according to the present embodiment, preferably, the annular frame 1011 is installed at both sides of the front half and the rear half of the cylinder screen 1, a total of 4, the annular frame 1011 is connected with the rib plate 103 on the cylinder screen 1, and keeps relative static with the overall structure of the cylinder screen 1, for supporting the screen 105 and providing sliding tracks for the first spiral strip 1051 and the third spiral strip 1053, each annular frame 1011 has two limiting grooves 1046 on the top, and the angles of the groove positions are opposite, preferably, the interval is 180 degrees, and the single limiting groove is grooved by 30 degrees, so that the rotation angle is limited to 30 degrees, and the rotation range of the first pinion 1044 and the second pinion 1045 is limited to 30 degrees.

[0048] As Figure 7 shown, the screen 105 includes the first spiral strip 1051, the second spiral strip 1052, the third spiral strip 1053 and the fourth spiral strip 1054; the ends of the second spiral strip 1052 and the fourth spiral strip 1054 are connected with the annular frame 1011 respectively; the ends of the first spiral strip 1051 and the third spiral strip 1053 are located in the limiting groove 1046 of the annular frame 1011, and the four spiral strips are used to constitute the screen 105 of the cylinder screen 1; the first pinion 1044 is connected with the first spiral strip 1051, for driving the first spiral strip 1051 to rotate; the second pinion 1045 is connected with the third spiral strip 1053, for driving the third spiral strip 1053 to rotate; the annular frame 1011 has two limiting grooves 1046 on the top, and the ends of the first spiral strip 1051 and the third spiral strip 1053 are located in the limiting grooves 1046 respectively, and the limiting grooves 1046 are used to limit the movement range of the first spiral strip 1051 and the third spiral strip 1053 respectively.

[0049] The first spiral strip 1051, the second spiral strip 1052, the third spiral strip 1053 and the fourth spiral strip 1054 have the same structure.

[0050] As Figure 2As shown, the driving system 2 comprises a first driving motor 201, a second driving motor 202, a first gap adjustment motor 203 and a second gap adjustment motor 204; the rubber main shaft of the first driving motor 201 is in close contact with the first sliding rail 109 on the rear half screen of the cylinder screen 1, for driving the rear half screen of the cylinder screen 1 to rotate; the rubber main shaft of the second driving motor 202 is in close contact with the second sliding rail 1010 on the front half screen of the cylinder screen 1, for driving the front half screen of the cylinder screen 1 to rotate; the main shaft of the first gap adjustment motor 203 cooperates with the gap adjustment gear 1041 of the rear half screen of the cylinder screen 1, for driving the gap adjustment gear 1041 of the rear half screen to rotate; the main shaft of the second gap adjustment motor 204 cooperates with the gap adjustment gear 1041 of the front half screen of the cylinder screen 1, for driving the gap adjustment gear 1041 of the front half screen to rotate.

[0051] Preferably, the gap adjustment gear 1041 is 2 in total, respectively located on the front half screen and the rear half screen of the cylinder screen 1, respectively connected with the output main shaft of the first gap adjustment motor 203 and the second gap adjustment motor 204, and the two gap adjustment gears 1041 respectively engage with the outer teeth of the gear ring 1042 on the front half screen and the rear half screen, and drive the gear ring 1042 to rotate through gear engagement according to the required gap adjustment; the gear ring 1042 is connected with the annular frame 1011 through the second thin wall bearing 108, and can rotate relative to the annular frame 1011; the annular frame 1011 is connected with the rib plate 103 of the cylinder screen 1, and remains in a relatively static state; the first pinion 1044 is used to drive the first spiral strip 1051 to rotate; the second pinion 1045 is used to drive the third spiral strip 1053 to rotate; the limiting groove 1046 is used to limit the movement range of the first spiral strip 1051 and the first spiral strip 1053; the gap adjustment gear 1041 drives the gear ring 1042 to rotate under the driving of the first gap adjustment motor 203, and the rotating gear ring 1042 drives the first pinion 4044 and the second pinion 1045 to rotate through inner ring engagement, at this time, the first spiral strip 1051 and the third spiral strip 1053 connected with the first pinion 1044 and the second pinion 1045 respectively are driven to rotate around the shaft center, and the screen gap changes.

[0052] The driving system 2 is fixed on the cylinder screen 1 and the rack 3, for driving the cylinder screen 1 to rotate and driving the screen gap of the cylinder screen 1 to adjust.

[0053] The rack 3 is located at the rear part of the combine harvester and connected with the bottom plate of the harvester, for installing the cylinder screen 1 and the driving system 2.

[0054] The dual-stage cylindrical screen cleaning device further includes a feed rate sensor 4 and a control system. The control system is connected to the feed rate sensor 4 and the drive system 2 respectively. The feed rate sensor 4 is located on the main shaft of the threshing drum and is used to monitor the feed rate in the cleaning device and transmit it to the control system. The control system compares the feed rate detected by the feed rate sensor 4 with a preset value to determine the blockage of the material in the screen. If the feed rate is greater than the preset value, there is blockage in the screen; otherwise, it is normal. If there is blockage in the screen, the control system controls the drive system 2 to drive the gap adjustment device 104 to adjust the rotation speed of the front half screen and the rear half screen of the cylindrical screen 1 and the screen gap size of the cylindrical screen 1.

[0055] The control system is a microcontroller, which is connected to the harvester's cab.

[0056] Preferably, the system also includes an alarm device connected to the control system; preferably, the alarm device is a buzzer.

[0057] like Figure 8 As shown, the first drive motor 201 can drive and control the rear half of the cylindrical screen 1 in real time, the second drive motor 202 can control the front half of the cylindrical screen 1 in real time, the first gap adjustment motor 203 can control the gap value of the screen mesh of the rear half of the cylindrical screen 1 in real time, and the second gap adjustment motor 204 can control the gap value of the screen mesh of the front half of the cylindrical screen 1 in real time. The feed amount sensor 4 detects the amount of rice fed into the feeding screen. The feed amount sensor 4 can transmit the data to the microcontroller for processing. The microcontroller communicates with each motor controller according to the detected feed amount data to control the speed of each motor.

[0058] A control method for the dual-stage cylindrical screen cleaning device includes the following steps:

[0059] After the threshing process is completed between the threshing drum and the concave screen, the grains, along with the stems and impurities that have passed through the concave screen, enter the cylindrical screen 1. The drive system 2 drives the cylindrical screen 1 to rotate, so that the rotation speed of the first half of the cylindrical screen 1 is v1. Through rotation, the grains and stems in the screen are separated into layers. According to the distribution characteristics of the material under the concave screen, most of the grains and stems are cleaned in the first half of the screen. The stems and impurities separated by the first half of the screen enter the second half of the cylindrical screen 1. The drive system 2 drives the second half of the screen to rotate at a speed of v2, where v2 > v1. Due to the speed difference, the separation angle between the grains and stems changes, and the grains and stems in the material to be cleaned are fully separated. The stems and impurities are discharged from the tail of the cylindrical screen 1.

[0060] Further comprising the following steps: the feeding amount sensor 4 monitors the feeding amount in the cleaning device and transmits to the control system, when the feeding amount is suddenly changed or the entanglement in the screen occurs, the feeding amount detected by the feeding amount sensor 4 exceeds the preset feeding amount threshold value, the control system judges that the blockage occurs in the cylindrical screen 1, and controls the driving system 2 to adjust the rotating speed of the front half screen and the rear half screen of the cylindrical screen 1 and the screen mesh gap size of the cylindrical screen 1 until the feeding amount sensor 4 monitors the feeding amount in the cleaning device again within the preset value, which indicates that the working condition in the screen returns to the normal level, and the driving system 2 drives the rotating speed of the front half screen and the rear half screen and the screen mesh gap size of the cylindrical screen 1 back to the initial setting.

[0061] In one specific embodiment of the present application, the inner diameter of the single section of the cylindrical screen 1 is 800 mm, and the length is 700 mm; the length of the spiral conveying plate 102 is 700 mm, and the pitch is 200 mm; the rib plates 103 are four groups in the front half screen and the rear half screen of the cylindrical screen 1 and are uniformly distributed around the cylindrical screen 1 for constituting the basic structural framework of the cylindrical screen; the diameters of the first spiral strip 1051, the second spiral strip 1052, the third spiral strip 1053 and the fourth spiral strip 1054 are all 8 mm, the spiral pitch is 64 mm, the four spiral strips are installed on the annular frame 1011 with an interval angle of 90 degrees, and the interval of the installed screen mesh 105 is 8 mm. The angle interval of the slotted position of the annular frame 1011 is 180 degrees, and the single limiting slot 1046 limits the rotating angle of 30 degrees.

[0062] In one specific embodiment of the present application, the maximum grain feeding amount threshold value can be set, the feeding amount in the screen is collected by the feeding amount sensor 4 to judge the blockage of the material in the screen, if normal, the rotating speed of the front half screen driven by the second driving motor 202 is 34 r / min, the rotating speed of the rear half screen driven by the first driving motor 201 is 41 r / min, and the second gap adjusting motor 204 and the first gap adjusting motor 203 are in the static state; if the screen is blocked, and the rotating speed of the front half screen is <40 r / min, the rotating speed of the first driving motor 201 and the second driving motor 202 is +2 r / min, the first gap adjusting motor 203 and the second gap adjusting motor 204 are driven to rotate 10 degrees, the working state is maintained for 5 s, and whether the screen is blocked is judged again according to the collected material feeding amount, if normal, the four motors all return to the normal working state, if it is judged that the screen is blocked, and the rotating speed of the front half screen is <40 r / min, the cycle is repeated once; if it is judged that the screen is blocked, and the rotating speed of the front half screen has reached 40 r / min at this time, it is proved that the screen is seriously blocked, and the machine failure occurs, at this time, the control system controls the alarm device to send the failure alarm signal.

[0063] In one specific embodiment of the present application, preferably, the initial speed of the front half of the cylinder sieve driven by the second driving motor 202 is set to 34 r / min, the initial speed of the rear half of the cylinder sieve driven by the first driving motor 201 is set to 41 r / min, and the initial state of the first gap adjustment motor 203 and the second gap adjustment motor 204 is both static state.

[0064] As shown in Figure 9 , the discrete element simulation results of the front half of the sieve under different rotating speeds, wherein, Figure 9 (a) is 34 r / min, Figure 9 (b) is 36 r / min, Figure 9 (c) is 38 r / min, Figure 9 (d) is 40 r / min, and the 5s moment when stable cleaning has been formed is selected, as shown in Figure 9 (a), the stems move in the sieve in a collapsed form, and the grains can be well sieved, and as the rotating speed gradually increases, the stems move in the sieve in a turnover form, and the grains exist in part of the waterfall movement, which can complete the sieving with higher efficiency, and can cope with the working conditions of large feeding amount and easy clogging in the sieve, and when the rotating speed reaches 40 r / min, as shown in Figure 9 (d), individual stems appear in the waterfall phenomenon, and if the speed continues to increase, the stems in the waterfall movement form will affect the speed of the stems to the rear, thereby affecting the cleaning efficiency, so the upper limit speed of the front half of the sieve is not higher than 40 r / min.

[0065] As shown in Figure 10 , the discrete element simulation results of the rear half of the sieve under different rotating speeds, wherein, Figure 10 (a) is 41 r / min, Figure 10 (b) is 43 r / min, Figure 10 (c) is 45 r / min, Figure 10 (d) is 47 r / min, and the 5s moment when stable cleaning has been formed is also selected, and when the cylinder sieve 1 transports the material to the rear, the material will accumulate as a whole in the sieve in an S-shaped trajectory, and the material cannot be well dispersed, thereby affecting the cleaning efficiency of the rear half of the sieve, so the cylinder sieve 1 is divided into front and rear sieves. In order to disperse the to-be-cleaned material accumulated as a lump in the rear half of the sieve, the rotating speed of the rear half of the sieve needs to be higher than that of the front half of the sieve, which is set to 41 r / min, as shown in Figure 10 (a), it can be seen that the material in the sieve can be well dispersed, the grains can be separated from the stems, and the cleaning process is completed; when the rotating speed of the rear half of the sieve is increased to 47 r / min, as shown in Figure 10(d) shown, at this time can see the material in the screen is more dispersed, grain from the accumulation in a side of the stem grain separation, effectively solve the loss caused by the accumulation of material in the screen grain cleaning.

[0066] As Figure 11 and 12 shown, the screen 105 there are two extreme conditions, such as A working condition, located in the initial installation position, the screen 105 uniform spacing is 8mm; such as B working condition, the gap adjusting gear 1041 driven gear 1042 rotation, and then drive the first pinion 1044 and the second pinion 1045 fixed connection with the first spiral strip 1051 and the third spiral strip 1053 movement, rotating around the first spiral strip 1051 and the third spiral strip 1053 in the main direction will present left and right moving features, and the second spiral strip 1052 and the fourth spiral strip 1054 and cylinder screen 1 keep relatively static, so as to change the gap size of the screen 105, when the first pinion 1044 and the second pinion 1045 movement to limit slot 1046 limit position, namely with the initial position offset 30 degrees, at this time the screen 105 spacing is 13.3mm and 2.7mm interval period arrangement.

[0067] The first gap adjusting motor 203, the second gap adjusting motor 204 drive rotating angle θ and the screen 105 spacing relationship is: and gap L1 and L2 interval period arrangement.

[0068] As Figure 13As shown, in one specific embodiment of the present application, the double-section cylinder sieve cleaning device is provided with a preset maximum grain feeding amount threshold in the sieve, preferably, the feeding amount sensor 4 is a torque sensor, the feeding amount of the material in the sieve during the field work of the combine harvester is collected in real time by the feeding amount sensor 4, the blocking condition of the material in the double-section cylinder sieve 1 is judged in real time according to the feeding amount value, if the cleaning condition in the sieve is normal and no blocking occurs, the initial state of each motor is maintained, at this time, the rotation speed of the front half section of the cylinder sieve 1 driven by the second driving motor 202 is 34 r / min, the rotation speed of the rear half section of the cylinder sieve 1 driven by the first driving motor 201 is 41 r / min, the second gap adjusting motor 204 and the first gap adjusting motor 203 are in a static state, the gap of the cylinder sieve screen 105 is the initial value, and the distance between each spiral strip is uniformly 8 mm; if the value of the feeding amount sensor 4 exceeds the preset feeding amount threshold, at this time, it is judged that the cylinder sieve appears a blocking condition, and it is judged that the rotation speed of the front half section of the cylinder sieve 1 is <40 r / min, then the rotation speed of the half section of the cylinder sieve driven by the first driving motor 201 and the second driving motor 202 is +2 r / min, at this time, the rotation speed of the front half section of the cylinder sieve 1 is 36 r / min, the rotation speed of the rear half section of the cylinder sieve 1 is 43 / min, the first gap adjusting motor 203 and the second gap adjusting motor 204 are controlled to drive rotation by 10 degrees, at this time, the gap of the screen 105 is 9.78 mm and 6.22 mm, the gaps are arranged in intervals, the working state is maintained for 5 s, the large-gap screen 105 is matched with the higher rotation speed of the cylinder sieve 1, the separation speed of the grains and the residues is improved, and the normal cleaning state in the cylinder sieve is restored. Again, whether the sieve is blocked is judged according to the feeding amount of the material in the sieve collected by the feeding amount sensor 4, if the cleaning condition in the sieve is normal and no blocking occurs, the rotation speed of the front half section of the sieve driven by the second driving motor 202 is restored to 34 r / min, the rotation speed of the rear half section of the sieve driven by the first driving motor 201 is restored to 41 r / min, the first gap adjusting motor 203 and the gap adjusting motor 204 are reversely rotated by 10 degrees to restore to the initial state, at this time, the gap of the screen 105 is restored to 8 mm; if the feeding amount of the material in the sieve collected by the feeding amount sensor is still greater than the preset threshold, it is judged that the sieve is still in a blocking condition, and the rotation speed of the front half section of the sieve driven by the second driving motor 202 is <40 r / min, then the circulation is repeated once, the rotation speed of the half section of the cylinder sieve driven by the first driving motor 201 and the second driving motor 202 is +2 r / min, at this time, the rotation speed of the front half section of the cylinder sieve 1 is 38 r / min, the rotation speed of the rear half section of the cylinder sieve 1 is 45 / min, the first gap adjusting motor 203 and the second gap adjusting motor 204 are controlled to drive rotation by 10 degrees again, which is different from the initial position by 20 degrees, at this time, the gap of the screen 105 is 4.44 mm and 11.56 mm, the large and small gaps are arranged in intervals, the working state is maintained for 5 s again; the feeding amount in the sieve is detected again after 5 s, and the above judgment process is repeated.If the screen is judged to be blocked, and the front half of the screen driven by the second driving motor 202 reaches a speed of 40 r / min, it indicates that the screen is seriously blocked, and the machine is malfunctioning, at this time, the alarm device sends a malfunction alarm signal.

[0069] In one specific embodiment of the present application, the present application realizes the specific process of double-section cylinder screen cleaning:

[0070] When the combine harvester driver operates the combine harvester in the field, the header cuts the rice and transports it into the cylinder through the conveying groove. After the threshing process is completed between the cylinder and the concave screen, the grains and the stems and residues passing through the concave screen enter the cylinder screen 1. The uniform rotational speed of the cylinder screen 1 is 34 r / min, and the separation of the grains and the stems in the screen is realized by rotation. According to the distribution characteristics of the material below the concave screen, most of the grains and the stems are cleaned in the front half of the screen. The uniform rotational speed of the rear half of the screen is 41 r / min. The stems and residues separated by the front half of the screen enter the rear half of the cylinder screen 1. Due to the speed difference, the separation angle of the grains and the stems changes. After the grains and the stems in the cleaning material are fully separated, the stems and the residues are discharged from the tail of the cylinder screen 1. When the feeding amount suddenly changes or the screen is entangled, the value of the feeding amount sensor 4 exceeds the set feeding amount threshold, and it is judged that the cylinder screen 1 is blocked. According to the degree of blockage in the screen, the driving motor and the gap adjusting motor can adjust the rotational speed of the cylinder screen 1 and the size of the screen gap of the cylinder screen 1 step by step. After 5 seconds, the blockage is detected again, which can avoid continuous high-load cleaning in the screen and improve the cleaning efficiency of the combine harvester in the field.

[0071] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0072] The present application is aimed at the problem that the commonly used connecting rod type cleaning screen has large vibration and is prone to vibration failure. The rice cleaning cylinder screen device is designed, and the rotary motion greatly reduces the vibration of the cleaning device compared with the connecting rod type motion, thereby improving the working reliability of the whole machine. In view of the different grain content in the mixture discharged by the cylinder and the different cleaning requirements, a double-section cylinder screen is designed to determine the different rotational speeds of the front and rear screens and the size of the screen, thereby improving the rice cleaning efficiency. In view of the problem that the feeding amount changes due to the different growth densities of rice in the field, the screen gap adjustment and double-section screen rotational speed adjustment structure are designed to realize the function of adjusting the rotational speed and the screen gap in real time according to the feeding amount and the blockage in the screen.

[0073] The above detailed description merely illustrates feasible embodiments of the present application, and is not intended to limit the protection scope of the present application, and equivalent embodiments or changes made without departing from the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A double-deck cylinder cleaner characterized in that, The cylinder sieve (1), the driving system (2) and the frame (3); The cylinder sieve (1) is installed on the frame (3) and surrounds the threshing cylinder and the concave sieve, and is used for cleaning the threshed rice mixture; the cylinder sieve (1) comprises separated front and rear half sieves, the front and rear half sieves are coaxially arranged, and the driving system (2) is connected with the front and rear half sieves respectively, and is used for driving the front and rear half sieves to rotate respectively. The cylinder sieve (1) comprises two supporting wheels (101), two spiral conveying plates (102), a plurality of rib plates (103), two sieve nets (105), a support (106), a first sliding rail (109) and a second sliding rail (1010). The two spiral conveying plates (102) are coaxially arranged, a plurality of parallel rib plates (103) are uniformly distributed around each spiral conveying plate (102), the spiral conveying plate (102) is connected with the rib plate (103), and the two ends of the rib plate (103) are respectively provided with annular frames (1011); each spiral conveying plate (102) coaxially sleeves a sieve net (105), the first sliding rail (109) is arranged at the front end of the rear half sieve and connected with the annular frame (1011) at the front end of the rear half sieve, the second sliding rail (1010) is arranged at the rear end of the front half sieve and connected with the annular frame (1011) at the rear end of the front half sieve; the two supporting wheels (101) are installed on the frame (3), one supporting wheel (101) is connected with the first sliding rail (109), and the other supporting wheel (101) is connected with the second sliding rail (1010); one side of the support (106) is connected with the sieve net (105), and the other side is connected with a slip ring on the threshing cylinder main shaft, and is used for supporting the sieve net (105).

2. The dual-stage cylinder sieve cleaning apparatus of claim 1, wherein, The cylinder sieve (1) further comprises two sets of gap adjusting devices (104); One set of gap adjusting devices (104) is arranged at the front end of the front half sieve and connected with the annular frame (1011) at the front end of the front half sieve; the other set of gap adjusting devices (104) is arranged at the rear end of the rear half sieve and connected with the annular frame (1011) at the rear end of the rear half sieve; the gap adjusting device (104) is connected with the frame (3) through a first thin-wall bearing (107), and the gap adjusting device (104) is connected with the driving system (2), and is used for adjusting the gap of the sieve net (105).

3. The dual-stage cylinder sieve cleaning apparatus of claim 2, wherein, The gap adjusting device (104) comprises a gap adjusting gear (1041), a gear ring (1042), a first pinion (1044), a second pinion (1045) and a limiting groove (1046). The gap adjusting gear (1041) is engaged with the external teeth of the gear ring (1042) for driving the gear ring (1042) to rotate; the first pinion (1044) is connected with the screen (105) and engaged with the internal teeth of the gear ring (1042) for driving the screen (105) to rotate; the second pinion (1045) is connected with the screen (105) and engaged with the internal teeth of the gear ring (1042) for driving the screen (105) to rotate; the annular frame (1011) is provided with a limiting groove (1046) for limiting the moving range of the screen (105); The outer ring of the second thin-wall bearing (108) is connected with the gear ring (1042) and the inner ring is connected with the annular frame (1011) for supporting the gear ring (1042) to rotate.

4. The dual-stage cylinder sieve cleaning apparatus of claim 3, wherein, The screen (105) comprises a first spiral strip (1051), a second spiral strip (1052), a third spiral strip (1053) and a fourth spiral strip (1054); The ends of the second spiral strip (1052) and the fourth spiral strip (1054) are respectively connected with the annular frame (1011); the ends of the first spiral strip (1051) and the third spiral strip (1053) are located in the limiting groove (1046) of the annular frame (1011); The first pinion (1044) is connected with the first spiral strip (1051) for driving the first spiral strip (1051) to rotate; The second pinion (1045) is connected with the third spiral strip (1053) for driving the third spiral strip (1053) to rotate; The annular frame (1011) is provided with two limiting grooves (1046) on the upper surface, the ends of the first spiral strip (1051) and the third spiral strip (1053) are respectively located in the limiting grooves (1046), and the limiting grooves (1046) are respectively used for limiting the moving range of the first spiral strip (1051) and the third spiral strip (1053).

5. The dual-stage cylinder sieve cleaning apparatus of claim 3, wherein, The driving system (2) comprises a first driving motor (201), a second driving motor (202), a first gap adjusting motor (203) and a second gap adjusting motor (204); The first driving motor (201) is tightly attached to the rear half screen for driving the rear half screen of the cylindrical screen (1) to rotate; the second driving motor (202) is tightly attached to the front half screen for driving the front half screen of the cylindrical screen (1) to rotate; the main shaft of the first gap adjusting motor (203) is matched with the gap adjusting gear (1041) of the rear half screen of the cylindrical screen (1) for driving the gap adjusting gear (1041) of the rear half screen to rotate; the main shaft of the second gap adjusting motor (204) is matched with the gap adjusting gear (1041) of the front half screen of the cylindrical screen (1) for driving the gap adjusting gear (1041) of the front half screen to rotate.

6. The dual-stage cylinder sieve cleaning apparatus of claim 1, wherein, It further comprises a feeding amount sensor (4) and a control system; The control system is connected with the feeding amount sensor (4) and the driving system (2) respectively. The feeding amount sensor (4) is located on the main shaft of the threshing cylinder, used for monitoring the feeding amount in the cleaning device and transmitting to the control system, the control system compares the feeding amount detected by the feeding amount sensor (4) with the preset value, judges the blocking condition of the material in the screen, if the feeding amount is greater than the preset value, there is a blockage in the screen, otherwise it is normal; if the screen is blocked, the control system controls the driving system (2) to drive the gap adjusting device (104) to adjust the rotating speed of the front half screen and the rear half screen of the cylinder screen (1) and the screen mesh gap size of the cylinder screen (1).

7. A method of controlling a dual-deck cylinder cleaner according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: After the threshing process is completed between the threshing cylinder and the concave screen, the grains and the stems and residues passing through the concave screen enter the cylinder screen (1), the driving system (2) drives the cylinder screen (1) to rotate, so that the rotating speed of the front half screen of the cylinder screen (1) is v1, the layering and separation of the grains and the stems in the screen are realized by rotation, the stems and residues separated by the front half screen enter the rear half screen of the cylinder screen (1), the driving system (2) drives the rear half screen to rotate at a speed of v2, and v2>v1, because of the speed difference, the separation angle of the grains and the stems changes, and when the grains and the stems in the cleaned material are fully separated, the stems and residues are discharged from the tail of the cylinder screen (1).

8. The control method of a two-stage cylinder screen cleaning apparatus according to claim 7, characterized by, The method further comprises the following steps: The feeding amount sensor (4) monitors the feeding amount in the cleaning device and transmits to the control system, when the feeding amount suddenly changes or the screen is entangled, the feeding amount detected by the feeding amount sensor (4) exceeds the preset feeding amount threshold value, the control system judges that the cylinder screen (1) is blocked, and controls the driving system (2) to adjust the rotating speed of the cylinder screen (1) and the screen mesh gap size of the cylinder screen (1).

9. A harvester characterized by The double-section cylinder screen cleaning device comprises the double-section cylinder screen cleaning device according to any one of claims 1-6.

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