Grain combine harvester cleaning device and grain combine harvester

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a cleaning device of a grain combine harvester, which is characterized in that an upper screen box comprises an upper screen box left beam, an upper screen box front beam, an upper screen box right beam and an upper screen box rear beam which are connected end to end; the upper screen comprises an upper screen frame and an upper screen body structure mounted on the upper screen frame, the upper screen frame is rectangular, and the upper screen frame comprises an upper screen left beam, an upper screen front beam, an upper screen right beam and an upper screen rear beam which are sequentially connected end to end; the upper screen left beam, the upper screen right beam, the upper screen front beam and the upper screen rear beam are hollow beams with the wall thickness ranging from 1 mm to 4 mm respectively. The upper screen box left beam, the upper screen box front beam, the upper screen box right beam and the upper screen box rear beam are hollow beams with the wall thickness ranging from 1 mm to 4 mm respectively. According to the cleaning device, the overall strength of the cleaning device can be reduced, the overall toughness of the cleaning device can be improved, the cleaning device has certain elastic deformation capacity under the condition that the whole machine performance is met, the cleaning device can elastically deform to a certain degree along with deformation of a rack, and interference caused by non-concentricity of the cleaning device and the rack is compensated.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery technical field, specifically, relate to a grain combine harvester cleaning device and grain combine harvester. BACKGROUND

[0002] In the design of the traditional grain combine harvester, in order to improve production efficiency and reduce the weight of the machine, the rack is usually made of Q235D material, and the thin steel plate with a thickness of 3-5mm. Due to design considerations, the engine and the grain bin are generally arranged at the upper end of the rack. However, after the whole machine is installed, the rack may be deformed to a certain extent. This deformation causes the left and right connecting half shafts of the upper and lower cleaning screens installed at the lower end of the rack to be difficult to maintain concentricity (i.e., the cleaning screens are not concentric with the rack), which in turn causes the cleaning screen left and right rocker arms to be out of alignment. This problem can easily lead to deformation and damage of the cleaning screen and its related components under the action of long-term high-speed vibration.

[0003] The cleaning device is one of the key components of the grain combine harvester, and its normal operation is crucial to ensure the harvesting quality. In the prior art, the design of the cleaning device usually focuses on rigidity to ensure its stability and reliability under various working conditions. The cleaning device usually uses high-stiffness steel materials such as carbon steel, stainless steel, and cast steel. However, this also brings the problem that when the rack deforms, the cleaning screen is difficult to adapt to the deformation, thereby affecting the working efficiency and service life. Therefore, seeking a cleaning screen design scheme that can effectively deal with the rack deformation problem has become an important issue to improve the overall performance of the grain combine harvester. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a grain combine harvester cleaning device, which can reduce the overall strength of the cleaning device, improve the overall toughness of the cleaning device, and have a certain elastic deformation ability under the condition of meeting the overall performance of the machine. The cleaning device can undergo a certain degree of elastic deformation with the deformation of the rack, and compensate for the interference caused by the non-concentricity with the rack.

[0005] Another purpose of the utility model is to provide a grain combine harvester, which can reduce the overall strength of the cleaning device, improve the overall toughness of the cleaning device, and have a certain elastic deformation ability under the condition of meeting the overall performance of the machine. The cleaning device can undergo a certain degree of elastic deformation with the deformation of the rack, and compensate for the interference caused by the non-concentricity with the rack.

[0006] The technical solution of the utility model is as follows:

[0007] A grain combine harvester cleaning device, comprising a driving mechanism, a crank linkage mechanism and a cleaning screen, the cleaning screen comprising an upper cleaning screen and a lower cleaning screen, the output end of the driving mechanism being connected with the upper cleaning screen and the lower cleaning screen respectively through the crank linkage mechanism, the upper cleaning screen comprising an upper screen box and an upper screen installed on the upper screen box, and the lower cleaning screen comprising a lower screen box and a lower screen installed on the lower screen box;

[0008] The upper screen box comprises a left beam, a front beam, a right beam and a rear beam connected in sequence, and the left beam and the right beam are respectively provided with a first reinforcing plate;

[0009] The upper screen comprises an upper screen frame and an upper screen body structure installed on the upper screen frame, the upper screen frame is rectangular, and comprises a left beam, a front beam, a right beam and a rear beam connected in sequence;

[0010] The left beam, the right beam, the front beam and the rear beam of the upper screen frame are hollow beams with a wall thickness ranging from 1 to 4 mm;

[0011] The left beam, the front beam, the right beam and the rear beam of the upper screen box are hollow beams with a wall thickness ranging from 1 to 4 mm.

[0012] Further, the front and rear ends of the upper screen box are respectively provided with a first rotating shaft, the first rotating shaft is provided with an upper rocker arm, the front and rear ends of the lower screen box are respectively provided with a second rotating shaft, the second rotating shaft is provided with a lower rocker arm, the driving mechanism is connected with the upper rocker arm at the front end and the lower rocker arm at the front end through the crank linkage mechanism, and the upper rocker arm at the rear end and the lower rocker arm at the rear end are respectively used for connecting with the frame of the harvester; wherein the upper rocker arm and the lower rocker arm are respectively made of aluminum alloy, cast iron or steel;

[0013] The first reinforcing plate is made of stainless steel plate with a thickness ranging from 0.5 to 1 mm;

[0014] The left beam, the right beam, the front beam and the rear beam of the upper screen are hollow beams with a wall thickness ranging from 2 to 4 mm;

[0015] The left beam, the front beam, the right beam and the rear beam of the upper screen box are hollow beams with a wall thickness ranging from 2 to 4 mm.

[0016] Further, the upper sieve box front beam is provided with a first support portion corresponding to the position of the upper sieve front beam, the first support portion has a first arc surface recessed inwardly, the upper sieve front beam is correspondingly mounted on the first arc surface to be connected with the first support portion, and the upper sieve box rear beam is fixedly connected with the upper sieve rear beam through a bolt assembly or a pin shaft assembly.

[0017] Further, the lower sieve box comprises a lower sieve box left beam, a lower sieve box front beam, a lower sieve box right beam and a lower sieve box rear beam connected in sequence, the lower sieve box front beam and the lower sieve box rear beam are hollow beams, and the lower sieve box left beam and the lower sieve box right beam are respectively provided with a second reinforcing plate.

[0018] The lower sieve comprises a lower sieve frame and a lower sieve body structure mounted on the lower sieve frame, the lower sieve frame is in a rectangular shape, and the lower sieve frame comprises a lower sieve left beam, a lower sieve front beam, a lower sieve right beam and a lower sieve rear beam connected in sequence.

[0019] The lower sieve box front beam is provided with a second support portion corresponding to the position of the lower sieve front beam, the second support portion has a second arc surface recessed inwardly, the lower sieve front beam is correspondingly mounted on the second arc surface to be connected with the second support portion, and the lower sieve box rear beam is fixedly connected with the lower sieve rear beam through a bolt assembly or a pin shaft assembly.

[0020] Further, the lower sieve left beam, the lower sieve right beam, the lower sieve front beam and the lower sieve rear beam are hollow beams with a wall thickness ranging from 1 mm to 4 mm.

[0021] The lower sieve box left beam, the lower sieve box front beam, the lower sieve box right beam and the lower sieve box rear beam are hollow beams with a wall thickness ranging from 1 mm to 4 mm.

[0022] The second reinforcing plate is a stainless steel plate with a thickness ranging from 0.5 mm to 1 mm.

[0023] Further, the upper sieve box rear beam and the lower sieve box rear beam are rectangular hollow pipe beams.

[0024] Further, the upper sieve box further comprises a load-bearing disc for receiving materials falling from the threshing concave plate, the load-bearing disc comprises a stepped plate for fine screening of grains, and the stepped plate is made of alloy steel.

[0025] Further, the upper sieve and the lower sieve are fish scale sieves, the upper sieve body structure comprises a plurality of groups of upper fish scale sieve pieces, the lower sieve body structure comprises a plurality of groups of lower fish scale sieve pieces, and the two ends of each of the upper fish scale sieve pieces are hingedly connected to the upper sieve frame through a sieve piece shaft, and the two ends of each of the lower fish scale sieve pieces are hingedly connected to the lower sieve frame through a sieve piece shaft.

[0026] The upper sieve is also equipped with an upper sieve plate adjustment device, which is used to adjust the opening and closing angle of the upper fish scale sieve plate.

[0027] The lower sieve is also equipped with a lower sieve plate adjustment device, which is used to adjust the opening and closing angle of the lower fish scale sieve plate.

[0028] Furthermore, the crank-connecting rod mechanism includes a drive shaft, a first crank-connecting rod mechanism, and a second crank-connecting rod mechanism. The first crank-connecting rod mechanism includes a first eccentric wheel and a first connecting rod that are hinged in sequence. The second crank-connecting rod mechanism includes a second eccentric wheel and a second connecting rod that are hinged in sequence. The first eccentric wheel and the second eccentric wheel are mounted on the drive shaft.

[0029] The first eccentric wheel is hinged to the upper rocker arm via a first connecting rod;

[0030] The second eccentric wheel is hinged to the lower rocker arm via a second connecting rod.

[0031] A grain combine harvester includes a frame and a grain combine harvester cleaning device, which is mounted on the frame via multiple connectors.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] In this device, the upper screen left beam, upper screen right beam, upper screen front beam, and upper screen rear beam are all hollow beams with a wall thickness ranging from 1 to 4 mm; the upper screen box left beam, upper screen box front beam, upper screen box right beam, and upper screen box rear beam are all hollow beams with a wall thickness ranging from 1 to 4 mm. The hollow structure inside the hollow beam has deformation capability, which is equivalent to reducing strength and increasing toughness. This device reduces the overall strength of the cleaning screen (including the upper screen box and the upper screen) and improves the overall toughness of the cleaning device, so that it has a certain elastic deformation capability while meeting the overall machine performance. The cleaning device can undergo a certain degree of elastic deformation with the deformation of the frame, compensating for the interference caused by the misalignment of the frame. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Fig. 1 This is a schematic diagram of the cleaning device of this utility model;

[0036] Fig. 2The utility model discloses a cleaning device structure principle diagram.

[0037] Fig. 3 The utility model discloses an upper cleaning screen structure schematic diagram.

[0038] In the drawing,

[0039] 1-cleaning fan;2-driving shaft;3-first connecting rod;4-second connecting rod;5-upper rocker arm;6-lower rocker arm;7-upper cleaning screen;8-lower cleaning screen;

[0040] 701-upper screen box left beam;702-upper screen box front beam;703-upper screen box rear beam;704-upper screen front beam;706-upper screen rear beam. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below, and obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0043] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. As "horizontal" merely means that it is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0046] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, 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 connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0047] Some embodiments of the utility model will be described in detail below with reference to the drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.

[0048] Example 1

[0049] Reference Figs. 1-3 The embodiment provides a grain combine harvester cleaning device, which comprises a driving mechanism, a crank connecting rod mechanism and a cleaning screen, the cleaning screen comprises an upper cleaning screen 7 and a lower cleaning screen 8, the output end of the driving mechanism is connected with the upper cleaning screen 7 and the lower cleaning screen 8 respectively through the crank connecting rod mechanism, and the cleaning screen adopts a double-screen structure; the cleaning screen is a core component of the harvester, and under the driving of the driving mechanism, the grain mixed with impurities such as chaff is separated out through continuous reciprocating motion. The upper cleaning screen 7 has a large adjustment range and is used for rough selection of the grain, and the lower cleaning screen 8 has a small adjustment range and is used for fine selection of the grain. The cleaning fan 1 is located in front of the cleaning screen, and the cleaning fan 1 is used for blowing away the grain mixture.

[0050] The upper cleaning screen 7 comprises an upper screen box and an upper screen installed on the upper screen box, and the lower cleaning screen 8 comprises a lower screen box and a lower screen installed on the lower screen box.

[0051] The upper screen box comprises an upper screen box left beam 701, an upper screen box front beam 702, an upper screen box right beam and an upper screen box rear beam 703 connected in head and tail, first reinforcing plates are respectively installed on the upper screen box left beam 701 and the upper screen box right beam, and the first reinforcing plates serve the purpose of improving the structural strength and toughness of the left and right side beams (the upper screen box left beam 701 and the upper screen box right beam) of the upper screen box.

[0052] The upper screen includes an upper screen frame and an upper screen body structure installed on the upper screen frame, and the upper screen body structure can be a structure of an integral screen plate or a structure composed of multiple groups of screen pieces.

[0053] The front and rear ends of the upper screen box are respectively provided with first rotating shafts, the first rotating shafts are installed with upper swing arms 5, the front and rear ends of the lower screen box are respectively provided with second rotating shafts, the second rotating shafts are installed with lower swing arms 6, the driving mechanism is connected with the front end upper swing arm 5 and the front end lower swing arm 6 through a crank connecting rod mechanism, and the rear end upper swing arm 5 and the rear end lower swing arm 6 are respectively connected with the frame of the harvester, so as to realize the hinging of the rear end upper swing arm 5 and the frame and the hinging of the rear end lower swing arm 6 and the frame.

[0054] Lightweight: The density of aluminum alloy is about 2.7g / cm 3 , which is about one third lighter than steel. This means that under the same volume, the weight of aluminum alloy is lighter; High strength: although light in weight, the strength of aluminum alloy is high, especially after heat treatment, the strength and hardness can be further improved; Good toughness, using 5000 series aluminum alloy and 6000 series aluminum alloy, etc., has good toughness. Therefore, the upper swing arm 5 and the lower swing arm 6 are also made of aluminum alloy material, which can also reduce the overall strength of the cleaning screen and improve the toughness.

[0055] The upper screen left beam, the upper screen right beam, the upper screen front beam 704 and the upper screen rear beam are respectively hollow beams with a wall thickness ranging from 1 to 4mm, and the upper screen left beam and the upper screen right beam are symmetrical structures (such as Fig. 3 ) to each other.

[0056] The upper screen box left beam 701, the upper screen box front beam 702, the upper screen box right beam and the upper screen box rear beam 703 are respectively hollow beams with a wall thickness ranging from 1 to 4mm, and the upper screen box left beam 701 and the upper screen box right beam are symmetrical structures (such as Fig. 3 ) to each other.

[0057] The first support part has a first circular arc surface recessed inward, the upper screen front beam 704 is correspondingly installed on the first circular arc surface to be connected and positioned with the first support part, and the upper screen box rear beam 703 and the upper screen rear beam 706 are fixedly connected through a plurality of bolt assemblies or pin shaft assemblies, which can improve the toughness of the upper cleaning screen and adapt to the deformation of the frame.

[0058] The lower sieve box comprises a front-to-rear connected lower sieve box left beam, a lower sieve box front beam, a lower sieve box right beam and a lower sieve box rear beam, the lower sieve box front beam and the lower sieve box rear beam are hollow beams with a thickness of 1-4 mm, and the lower sieve box left beam and the lower sieve box right beam are symmetrical structures, the lower sieve box left beam and the lower sieve box right beam are respectively provided with a second reinforcing plate, the second reinforcing plate is used to improve the structural strength and toughness of the left and right side beams of the lower sieve box (the lower sieve box left beam and the lower sieve box right beam), and the first reinforcing plate is used to improve the structural strength and toughness of the left and right side beams of the upper sieve box (the upper sieve box left beam 701 and the upper sieve box right beam). Preferably, the first reinforcing plate is a stainless steel plate with a thickness of 0.5-1 mm, and the second reinforcing plate is also a stainless steel plate with a thickness of 0.5-1 mm. Since the left and right side beams of the sieve box are used for mounting the sieve, the stability of the sieve is related, therefore, the first reinforcing plate and the second reinforcing plate are respectively arranged on the left and right side beams of the upper sieve box and the lower sieve box, so as to ensure that the upper sieve box and the lower sieve box have sufficient strength and toughness.

[0059] The lower sieve comprises a lower sieve frame and a lower sieve body structure mounted on the lower sieve frame, the lower sieve body structure can be a structure of an integral sieve plate or a structure composed of multiple groups of sieve pieces; wherein the lower sieve frame is rectangular, and the lower sieve frame comprises a lower sieve left beam, a lower sieve front beam, a lower sieve right beam and a lower sieve rear beam connected in sequence from front to rear, the lower sieve left beam, the lower sieve front beam, the lower sieve right beam and the lower sieve rear beam are hollow beams with a thickness of 1-4 mm, and the lower sieve left beam and the lower sieve right beam are symmetrical structures.

[0060] In the embodiment, the upper sieve box rear beam 703 and the lower sieve box rear beam are respectively rectangular hollow pipe beams. The outer side of the lower sieve box front beam is provided with a second support portion corresponding to the position of the lower sieve front beam, the second support portion has a second concave arc surface, the lower sieve front beam is correspondingly mounted on the second arc surface to cooperate with the second support portion to realize cooperative positioning, and the lower sieve box rear beam and the lower sieve rear beam are fixedly connected through a plurality of bolt assemblies or pin shaft assemblies. This connection mode can also improve the toughness of the lower cleaning sieve and adapt to the deformation of the rack.

[0061] The upper sieve and the upper sieve box, and the lower sieve and the lower sieve box are respectively arranged in a mounting mode of one end hinged positioning and the other end fixed, so that the front end of the fish scale sieve is positioned by a half shaft, and the rear end is connected to the sieve box by a mutually perpendicular positioning surface. The upper sieve is sent into the upper sieve box through the upper sieve box track, and is connected to the upper sieve box by bolts to form the upper cleaning sieve 7. The lower sieve is sent into the lower sieve box through the lower sieve box track, and is connected to the lower sieve box by bolts to form the lower cleaning sieve 8.

[0062] In the embodiment, the upper screen and the lower screen are respectively fish scale screens (for the convenience of description, the upper screen and the lower screen are uniformly replaced by fish scale screens in the following description), and correspondingly, the upper screen body structure comprises a plurality of groups of upper fish scale screen pieces, the lower screen body structure comprises a plurality of groups of lower fish scale screen pieces, a screen piece shaft is fixedly arranged on each upper fish scale screen piece, and a screen piece shaft is also fixedly arranged on each lower fish scale screen piece, and the two ends of the upper fish scale screen piece are respectively hinged to the upper screen frame through the screen piece shaft, and the two ends of the lower fish scale screen piece are respectively hinged to the lower screen frame through the screen piece shaft.

[0063] The upper fish scale screen piece and the lower fish scale screen piece are respectively made of alloy steel material with high strength and good toughness, and the upper fish scale screen piece, the lower fish scale screen piece and the stepped plate are respectively made of high-quality alloy steel plate with a plate thickness range of 0.8-3 mm.

[0064] In the embodiment Fig. 3 It is a left view structural diagram of the upper cleaning screen 7, and part of the structure of the upper cleaning screen 7 is shown as an example, and the structure of the lower cleaning screen 8 is consistent with that of the upper cleaning screen 7, so the structural diagram of the lower cleaning screen 8 is not shown.

[0065] Preferably, the upper screen left beam, the upper screen right beam, the upper screen front beam 704 and the upper screen rear beam are respectively hollow beams with a wall thickness range of 2-4 mm, the upper screen box left beam 701, the upper screen box front beam 702, the upper screen box right beam and the upper screen box rear beam 703 are respectively hollow beams with a wall thickness range of 2-4 mm, the lower screen left beam, the lower screen right beam, the lower screen front beam and the lower screen rear beam are respectively hollow beams with a wall thickness range of 2-4 mm, and the lower screen box left beam, the lower screen box front beam, the lower screen box right beam and the lower screen box rear beam are respectively hollow beams with a wall thickness range of 2-4 mm.

[0066] In summary, the upper screen box, the lower screen box, the upper screen frame and the lower screen frame are respectively hollow beams with a wall thickness range of 2-4 mm, the upper swing arm 5 and the lower swing arm 6 are respectively made of aluminum alloy material, and the upper screen box left beam 701 and the upper screen box right beam are respectively provided with a first reinforcing plate, and the lower screen box left beam and the lower screen box right beam are respectively provided with a second reinforcing plate, so that the structural strength of the cleaning screen can be comprehensively reduced, the toughness of the cleaning screen can be improved, the cleaning device can have a certain elastic deformation capacity when it is installed at the lower end of the machine frame, the cleaning device can be elastically deformed to a certain extent along with the deformation of the machine frame, and the interference caused by the eccentricity of the machine frame can be compensated.

[0067] The upper screen box is used for fixing the upper cleaning screen and is connected by bolts, and the lower screen box is used for fixing the lower cleaning screen and is connected by bolts, and reciprocating motion is realized under the action of the upper rocker arm 5 and the lower rocker arm 6. The upper screen box comprises a seed receiving disc (the structure of the screen box belongs to the prior art and will not be described here), wherein the seed receiving disc is an important component in the screen box, comprises a stepped plate made of alloy steel, is located below the threshing concave plate of the harvester, is used for receiving the material falling from the threshing concave plate, and transports the material to the cleaning screen through the stepped plate to complete the recovery of the grains, and blows out the impurities such as chaff and broken stalks from the body under the action of the cleaning fan 1.

[0068] The upper screen box is used for fixing the upper cleaning screen and is connected by bolts, and the lower screen box is used for fixing the lower cleaning screen and is connected by bolts, and reciprocating motion is realized under the action of the upper rocker arm 5 and the lower rocker arm 6. The upper screen box comprises a seed receiving disc (the structure of the screen box belongs to the prior art and will not be described here), wherein the seed receiving disc is an important component in the screen box, comprises a stepped plate made of alloy steel, is located below the threshing concave plate of the harvester, is used for receiving the material falling from the threshing concave plate, and transports the material to the cleaning screen through the stepped plate to complete the recovery of the grains, and blows out the impurities such as chaff and broken stalks from the body under the action of the cleaning fan 1.

[0069] The crank connecting rod mechanism is a conventional technology, which will be described briefly as follows:

[0070] The crank connecting rod mechanism comprises a transmission shaft 2, a first crank connecting rod mechanism and a second crank connecting rod mechanism. The first crank connecting rod mechanism comprises a first eccentric wheel and a first connecting rod 3 which are sequentially hinged. The second crank connecting rod mechanism comprises a second eccentric wheel and a second connecting rod 4 which are sequentially hinged. The first eccentric wheel and the second eccentric wheel are installed on the transmission shaft 2.

[0071] The first eccentric wheel is hinged with the upper rocker arm 5 through the first connecting rod 3, and the upper rocker arm 5 is hinged with the upper cleaning screen 7 through a first rotating shaft.

[0072] The second eccentric wheel is hinged with the lower rocker arm 6 through the second connecting rod 4, and the lower rocker arm 6 is hinged with the lower cleaning screen 8 through a second rotating shaft.

[0073] The driving mechanism can adopt a driving motor or a hydraulic motor. The output shaft end of the driving mechanism can be connected and driven with the transmission shaft 2 through a transmission mode of belt transmission, gear transmission or chain wheel transmission, and then the first crank connecting rod mechanism drives the reciprocating vibration of the upper rocker arm 5 and the upper cleaning screen 7, and the second crank connecting rod mechanism drives the reciprocating vibration of the lower rocker arm 6 and the lower cleaning screen 8, so as to realize the normal work of the cleaning screen.

[0074] The driving mechanism, the upper sieve sheet adjusting device, the lower sieve sheet adjusting device and the cleaning fan 1 are respectively electrically connected with the electro-hydraulic control system of the harvester, and the speed regulation function, the opening degree of the fish scale sieve and the running gear of the cleaning fan 1 can be realized through the electro-hydraulic control system.

[0075] It should also be noted that in the prior art, the connection between the beams in the upper sieve box, the connection between the beams in the lower sieve box, the connection between the beams in the upper sieve frame and the connection between the beams in the lower sieve frame are all connected together by direct welding or through standard parts, resulting in a relatively heavy overall weight; in the present embodiment, the connection between the upper sieve box left beam 701, the upper sieve box front beam 702, the upper sieve box right beam and the upper sieve box rear beam 703 in the upper sieve box can be rivet connection or bolt connection; the connection between the upper sieve left beam, the upper sieve front beam 704, the upper sieve right beam and the upper sieve rear beam 706 in the upper sieve frame can be rivet connection or bolt connection; the connection between the lower sieve box left beam, the lower sieve box front beam, the lower sieve box right beam and the lower sieve box rear beam in the lower sieve box can be rivet connection or bolt connection; the connection between the lower sieve left beam, the lower sieve front beam, the lower sieve right beam and the lower sieve rear beam in the lower sieve frame can be rivet connection or bolt connection. Compared with the prior art, this rivet connection or bolt connection can achieve the purpose of weight reduction and is more portable.

[0076] The overall working principle of the cleaning device is as follows: when working, the cleaning sieve (the upper cleaning sieve 7 and the lower cleaning sieve 8) reciprocatingly vibrates under the driving of the driving mechanism and the crank connecting rod mechanism, so that the grain mixture moves along the surface of the fish scale sieve towards the rear, the wind generated by the cleaning fan 1 located below the front of the cleaning sieve blows away the grain mixture, the light mixture such as seed husks and debris is carried out of the machine by the airflow, the grain falls from the fish scale sieve hole during movement, and the larger materials are thrown up to the groove on the surface of the fish scale sieve and continue to move towards the rear. By adjusting the different opening degrees of the front and rear sections of the fish scale sieve, the working requirements of different sieve sections are met. After double-layer filtering by the upper and lower sieves, the seeds are transported to the grain bin. The device has a reasonable and compact structure, stable and safe transmission and is easy to maintain.

[0077] Embodiment 2

[0078] A kind of grain combine, including frame and the grain combine cleaning device described, grain combine cleaning device is correspondingly installed in the lower part of rear end of frame. Specifically, on the basis that upper swing arm 5 of rear end and lower swing arm 6 of rear end are used to connect with the frame of harvester respectively, cleaning device is also installed on the frame by multiple connecting pieces, connecting piece is the main force component, bears cyclically varying impact load, its material can be selected cast steel or ductile cast iron, is connected with the frame of main machine by high-strength pin shaft (or bolt).To further ensure the connection effect of cleaning device and main machine, cleaning device and frame are also connected by multiple auxiliary connecting pieces, each connecting piece and each auxiliary connecting piece are a group to realize mutual cooperation and improve the stability of connection, connecting piece adopts high-strength bolt, auxiliary connecting piece adopts draw core rivet, each connecting place of cleaning device and frame is connected by draw core rivet and bolt in common, to improve the connection effect.

[0079] The beneficial effects of the technical scheme of the utility model are:

[0080] The device reduces the overall strength of the cleaning device, improves the overall toughness of the cleaning device, and the use of aluminum alloy material for the upper swing arm 5 and the lower swing arm 6 can also reduce the strength and improve the toughness. For example, the upper sieve box, the upper sieve, the lower sieve box and the lower sieve each adopt a hollow beam, the hollow structure in the hollow beam has a deformation capacity, which is equivalent to reducing the strength and improving the toughness. The upper sieve and the upper sieve box, and the lower sieve and the lower sieve box each adopt a one-end hinged positioning and the other-end fixed mounting method, which can also improve the toughness and adapt to the deformation of the frame, so that the overall cleaning device has a certain elastic deformation capacity under the condition of meeting the overall machine performance. The cleaning device can deform elastically to a certain extent with the deformation of the frame, and compensate for the interference caused by the different centers of the frame.

[0081] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent substitutions for part or all of the technical features. These modifications or substitutions do not change the essence of the corresponding technical scheme out of the scope of the technical scheme of the embodiments of the utility model.

[0082] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A grain combine cleaning apparatus comprising a drive mechanism, a crank linkage mechanism and cleaning sieves, the cleaning sieves comprising an upper cleaning sieve (7) and a lower cleaning sieve (8), the output of the drive mechanism being connected to the upper cleaning sieve (7) and the lower cleaning sieve (8) respectively via the crank linkage mechanism, the upper cleaning sieve (7) comprising an upper sieve box and upper sieve elements mounted to the upper sieve box, the lower cleaning sieve (8) comprising a lower sieve box and lower sieve elements mounted to the lower sieve box, characterised in that, The upper sieve box comprises a left beam (701), a front beam (702), a right beam and a rear beam (703) connected in sequence, and first reinforcing plates are respectively mounted on the left beam (701) and the right beam; The upper sieve comprises an upper sieve frame and an upper sieve body structure mounted on the upper sieve frame, the upper sieve frame is rectangular, and the upper sieve frame comprises a left beam, a front beam (704), a right beam and a rear beam (706) connected in sequence; The left beam, the right beam, the front beam (704) and the rear beam of the upper sieve are hollow beams with a wall thickness ranging from 1 to 4 mm; The left beam (701), the front beam (702), the right beam and the rear beam (703) of the upper sieve box are hollow beams with a wall thickness ranging from 1 to 4 mm.

2. The grain combine cleaning apparatus of claim 1, wherein, First rotary shafts are respectively arranged at the front end and the rear end of the upper sieve box, and upper swing arms (5) are mounted on the first rotary shafts; second rotary shafts are respectively arranged at the front end and the rear end of the lower sieve box, and lower swing arms (6) are mounted on the second rotary shafts; the driving mechanism is connected with the upper swing arm (5) at the front end and the lower swing arm (6) at the front end through the crank connecting rod mechanism, and the upper swing arm at the rear end and the lower swing arm (6) at the rear end are respectively used for being connected with a rack of a harvester; wherein, the upper swing arm (5) and the lower swing arm (6) are respectively made of aluminum alloy, cast iron or steel; The first reinforcing plates are stainless steel plates with a thickness ranging from 0.5 to 1 mm; The left beam, the right beam, the front beam (704) and the rear beam of the upper sieve are hollow beams with a wall thickness ranging from 2 to 4 mm; The left beam (701), the front beam (702), the right beam and the rear beam (703) of the upper sieve box are hollow beams with a wall thickness ranging from 2 to 4 mm.

3. The grain combine cleaning apparatus of claim 1, wherein, A first support portion with a first arc surface recessed inward is arranged at a position corresponding to the front beam (704) of the upper sieve on the outer side of the front beam (702) of the upper sieve box, the front beam (704) of the upper sieve is correspondingly mounted on the first arc surface to be connected with the first support portion in a matched mode, and the rear beam (703) of the upper sieve box is fixedly connected with the rear beam (706) of the upper sieve through a bolt assembly or a pin shaft assembly.

4. The grain combine cleaning apparatus of claim 1, wherein, The lower sieve box comprises a left beam, a front beam, a right beam and a rear beam connected in sequence, the front beam and the rear beam are hollow beams, and second reinforcing plates are respectively mounted on the left beam and the right beam; The lower sieve comprises a lower sieve frame and a lower sieve body structure mounted on the lower sieve frame, the lower sieve frame is rectangular, and the lower sieve frame comprises a left beam, a front beam, a right beam and a rear beam connected in sequence; The outer side of the lower sieve box front beam corresponds to the position of the lower sieve front beam, and a second support part is arranged, which has a second arc surface recessed inward, and the lower sieve front beam is correspondingly mounted on the second arc surface to be connected with the second support part in cooperation, and the lower sieve box rear beam is fixedly connected with the lower sieve rear beam through a bolt assembly or a pin shaft assembly.

5. The grain combine cleaning apparatus of claim 4, wherein, The lower sieve left beam, the lower sieve right beam, the lower sieve front beam and the lower sieve rear beam are hollow beams with a wall thickness ranging from 1 to 4 mm. The lower sieve box left beam, the lower sieve box front beam, the lower sieve box right beam and the lower sieve box rear beam are hollow beams with a wall thickness ranging from 1 to 4 mm. The second reinforcing plate is made of stainless steel plate with a thickness ranging from 0.5 to 1 mm.

6. The grain combine cleaning apparatus of claim 4, wherein, The upper sieve box rear beam (703) and the lower sieve box rear beam are rectangular hollow tube beams.

7. The grain combine cleaning apparatus of claim 1, wherein, The upper sieve box further comprises a load-bearing disc for receiving materials falling from the threshing concave plate, the load-bearing disc comprises a stepped plate for fine screening of grains, and the stepped plate is made of alloy steel.

8. The grain combine cleaning apparatus of claim 4, wherein, The upper sieve and the lower sieve are fish scale sieves, and the upper sieve structure comprises a plurality of upper fish scale sieve pieces, and the lower sieve structure comprises a plurality of lower fish scale sieve pieces, both ends of the upper fish scale sieve piece are hingedly connected to the upper sieve frame through a sieve piece shaft, and both ends of the lower fish scale sieve piece are hingedly connected to the lower sieve frame through a sieve piece shaft. The upper sieve further comprises an upper sieve piece adjusting device for adjusting the opening and closing angle of the upper fish scale sieve piece. The lower sieve further comprises a lower sieve piece adjusting device for adjusting the opening and closing angle of the lower fish scale sieve piece.

9. The grain combine cleaning apparatus of claim 2, wherein, The crank connecting rod mechanism comprises a transmission shaft (2), a first crank connecting rod mechanism and a second crank connecting rod mechanism, the first crank connecting rod mechanism comprises a first eccentric wheel, a first connecting rod (3) which are sequentially hingedly connected, the second crank connecting rod mechanism comprises a second eccentric wheel, a second connecting rod (4) which are sequentially hingedly connected, and the first eccentric wheel and the second eccentric wheel are installed on the transmission shaft (2); The first eccentric wheel is hingedly connected with the upper rocker arm (5) through the first connecting rod (3); The second eccentric wheel is hingedly connected with the lower rocker arm (6) through the second connecting rod (4).

10. A grain combine comprising a frame, characterized in that, The grain combine harvester cleaning device of any one of claims 1-9 is mounted on the frame through a plurality of connecting members.

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