Multi-stage threshing device

Abstract

The invention belongs to the technical field of gramineous crop threshing, and particularly relates to a multi-stage threshing device with a good threshing effect. Crops are fed into the feeding hopper, the driving mechanism drives the feeding coarse threshing roller to rotate around the axis of the feeding coarse threshing roller, and the crops are subjected to coarse threshing through the feeding coarse threshing roller and conveyed to the first threshing conveying section of the first fine threshing roller. The driving mechanism drives the first fine threshing roller to rotate around the axis of the first fine threshing roller, and coarse-threshed crops are subjected to primary fine threshing through cooperation of the first fine threshing roller and the first sieve plate. Crops which are not completely threshed are conveyed to the second fine threshing roller through the window, the driving mechanism drives the second fine threshing roller to rotate around the axis of the second fine threshing roller, the crops which are not completely threshed are subjected to secondary fine threshing through cooperation of the second fine threshing roller and the second sieve plate, and stalks are discharged from the slag outlet.

Description

Technical Field

[0001] The invention belongs to the technical field of threshing of gramineous crops, and in particular relates to a multi-stage threshing device. Background Art

[0002] A thresher in agriculture refers to a mechanical equipment that can separate the grains and stems of crops. It is mainly used for threshing crops such as wheat, rice, rapeseed, sorghum, barley, coix seed, mung bean, and soybean.

[0003] Generally, the thresher includes a shell and a threshing drum installed in the inner cavity of the shell; one end of the shell is the feed end, and the other end is the slag discharge end; the threshing drum rotates around its own horizontal axis through a motor, and feeds from the feed end to the slag discharge end; a feed port located at the feed end is provided at the upper part of the shell, a slag discharge port located at the slag discharge end is provided at one side of the shell, and a discharge port is provided at the bottom of the shell, and the feed port, slag discharge port and discharge port are all connected to the inner cavity of the shell. Crops are fed into the inner cavity of the shell through the feed port, and the motor drives the threshing drum to rotate around its own horizontal axis, so that the grains and stems of the crops are separated during the rotation and transportation process, and the stems are discharged from the slag discharge port, and the grains are discharged from the discharge port.

[0004] The Chinese patent document with application number 202110724244.4 discloses a multi-crop thresher with coaxial multi-drum flippable threshing teeth. The threshing drum is installed in the inner cavity of the shell and rotates around its own axis through a motor. One end of the shell is the feed end, and the other end is the slag discharge end. Its threshing drum includes a threshing section and a discharge section arranged adjacent to each other, the threshing section is arranged corresponding to the feed port, and the discharge section is arranged corresponding to the slag discharge port. The threshing section includes a threshing tooth rod, a first mounting plate, and a second mounting plate. There are several threshing tooth rods, and the several threshing tooth rods are detachably mounted between the first mounting plate and the second mounting plate through the flip mounting plates at both ends. Each threshing tooth rod includes a tooth rod and different threshing tooth combinations in the circumferential direction of the tooth rod for threshing different crops. The discharge section includes a third mounting plate and several grass tooth rods, the third mounting plate is located at the outer end of the second mounting plate, and the first mounting plate, the second mounting plate and the third mounting plate are coaxially arranged. The grass row tooth rod is installed between the second mounting plate and the third mounting plate, and a plurality of grass row teeth are arranged along the length direction of the grass row tooth rod. The crops are fed into the inner cavity of the shell through the feed port, and the motor drives the threshing drum to rotate around its own horizontal axis. The crops are spirally transported from the feed end to the slag discharge end, and the grains are separated from the stems under the action of the threshing section, and the grains are discharged from the discharge port. The stems are transported to the discharge section and finally discharged from the slag discharge port. However, in the actual use process, it was found that some grains still remained on the stems discharged from the slag discharge port, and there was a technical problem of poor threshing effect. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-stage threshing device with good threshing effect.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a multi-stage threshing device comprises a shell, and a first fine threshing drum and a second fine threshing drum rotatably installed in the shell; a feed hopper is installed at the feed inlet of the shell, and a feed rough threshing drum is installed in the feed hopper; the feed rough threshing drum is located on one side of the first fine threshing drum, and the second fine threshing drum is located on the other side of the first fine threshing drum, and both are driven by a driving mechanism;

[0007] The shell is provided with a first screen below the first fine threshing drum and a second screen below the second fine threshing drum; the shell is provided with a baffle between the first screen and the second screen, and a window is provided on the baffle for the passage of crops that are not completely threshed; the first fine threshing drum comprises a first threshing conveying section and a first threshing discharge section arranged in sequence along the conveying direction L1 of the crops after rough threshing, and the second fine threshing drum comprises a second threshing conveying section and a second threshing discharge section arranged in sequence along the conveying direction L2 of the crops that are not completely threshed; the feed port of the shell is located above the first screen and is arranged corresponding to the first threshing conveying section of the first fine threshing drum, the slag outlet of the shell is located above the second screen and is arranged corresponding to the second threshing discharge section of the second fine threshing drum, and the grain discharge port of the shell is located at the bottom of the shell and below the first screen and the second screen; the first threshing discharge section of the first fine threshing drum and the second threshing conveying section of the second fine threshing drum are both arranged corresponding to the window.

[0008] Furthermore, the feed coarse threshing roller includes a vertically arranged connecting plate, and two of the connecting plates are provided, and the two connecting plates are arranged at intervals in the horizontal direction and are coaxially installed through a first rotating shaft; the first rotating shaft is rotatably connected to the side wall of the feed hopper; the axial direction of the first rotating shaft is parallel to the rotation center of the first fine threshing roller; a plurality of feed rake tooth rods are installed between the two connecting plates, and the feed rake tooth rod includes a connecting rod parallel to the first rotating shaft, and rake teeth arranged on the outer peripheral surface of the connecting rod; one end of the connecting rod is connected to one of the connecting plates, and the other end is connected to the other connecting plate; a plurality of rake teeth are provided, and the plurality of rake teeth are arranged at intervals in pairs along the axial direction of the connecting rod.

[0009] Furthermore, the first fine threshing drum includes a vertically arranged mounting plate; two mounting plates are provided, and the two mounting plates are arranged at intervals along the conveying direction L1 of the crops after rough threshing, and are coaxially installed through a second rotating shaft; the second rotating shaft is rotatably connected to the side wall of the shell, and the first rotating shaft is parallel to the second rotating shaft; a plurality of threshing and grass discharge knife tooth rods are installed between the two mounting plates, and the threshing and grass discharge knife tooth rods include a knife tooth rod, and a threshing knife located in the first threshing conveying section and a threshing discharge rib located in the first threshing discharge section are arranged on the outer peripheral surface of the knife tooth rod; one end of the knife tooth rod is connected to one of the mounting plates, and the other end is connected to the other mounting plate.

[0010] A vertically arranged guide plate is connected to the top inner wall of the shell, and the guide plate is arranged along the spiral direction of the axial direction of the second rotating shaft; there are multiple guide plates, and the multiple guide plates are arranged in pairs along the axial direction of the second rotating shaft and arranged corresponding to the first threshing and conveying section.

[0011] Furthermore, the second fine threshing drum includes a horizontally arranged mounting cylinder, and a spiral conveying blade and a threshing rib structure are arranged on the outer circumferential surface of the mounting cylinder; the mounting cylinder is rotatably connected to the side wall of the shell through a third rotating shaft, and the third rotating shaft is parallel to the second rotating shaft; the spiral conveying blade is located in the second threshing and conveying section; the threshing rib structure is provided with multiple groups, and the multiple groups of threshing rib structures are arranged in pairs along the circumference of the mounting cylinder; each group of the threshing rib structure includes multiple threshing ribs arranged in pairs along the axial direction of the mounting cylinder.

[0012] Furthermore, a horizontal conveying auger is installed in the housing and is located below the first screen and the second screen; the seed discharge port is arranged corresponding to the discharge end of the horizontal conveying auger;

[0013] It also includes a lifting and conveying auger mechanism installed outside the shell; the lifting and conveying auger mechanism includes a lifting and conveying pipeline connected to the shell, and a lifting and conveying auger installed in the lifting and conveying pipeline; the lower end feed port of the lifting and conveying pipeline is arranged corresponding to and connected to the grain discharge port;

[0014] It also includes an air separation mechanism installed outside the shell, the air separation mechanism includes a separation cylinder, a material dispersion mechanism, a first air suction pipe and a first impurity removal fan;

[0015] The separation cylinder is vertically installed on one side of the shell, the top of the separation cylinder is an air suction port, and the lower end is a grain receiving port; the material dispersion mechanism is installed in the separation cylinder and has an inclined dispersion surface; there is a gap between the lower end of the dispersion surface and the inner wall of the separation cylinder for the grains to fall;

[0016] The upper end discharge port of the lifting and conveying pipeline is connected to the through hole on the side wall of the separation cylinder and is located above the dispersion surface; one end of the first suction pipe is a first connection port, and the other end is a first slag discharge port; the first connection port of the first suction pipe is connected to the suction port of the separation cylinder, and the first impurity removal fan is installed on the first suction pipe and is used to provide air selection pressure;

[0017] The horizontal conveying auger, the lifting conveying auger and the first impurity removal fan are all driven by a driving mechanism.

[0018] Furthermore, the material dispersion mechanism comprises a dispersion cone with a small upper end and a large lower end, and the upper surface of the dispersion cone serves as the dispersion surface; the dispersion cone is installed in the separation cylinder through a bracket.

[0019] Furthermore, it also includes a second impurity removal fan and a second air suction pipe; one end of the second air suction pipe is a second connection port, and the other end is a second slag discharge port; the second connection port is connected to the shell and is located below the first screen and the second screen, and the second impurity removal fan is installed on the second air suction pipe and is used to provide air selection pressure;

[0020] The second impurity removal fan is driven by a driving mechanism.

[0021] Furthermore, it also includes a first scraper connected to the threshing and discharging ribs, the length direction of the first scraper is parallel to the length direction of the knife tooth rod; one end of the first scraper in the width direction is close to the rotation center of the first fine threshing drum, and the other end of the first scraper in the width direction is far away from the rotation center of the first fine threshing drum, and there is a gap between the first scraper and the first screen.

[0022] Furthermore, it also includes a second scraper connected to the threshing rib and located in the second threshing discharge section, the length direction of the second scraper is parallel to the length direction of the mounting tube, one end of the second scraper in the width direction is adjacent to the outer circumferential surface of the mounting tube, and the other end of the second scraper in the width direction is away from the outer circumferential surface of the mounting tube and has a gap with the second screen.

[0023] Furthermore, the housing comprises a lower housing with an opening facing upward, and the barrier member is mounted on the lower housing and separates the upper opening of the lower housing into a first opening and a second opening;

[0024] Also includes a first upper cover for covering the first opening, and a second upper cover for covering the second opening;

[0025] The first fine threshing drum is located in the first opening, one end of the first upper cover is hinged to the barrier, and the other end is detachably connected to the upper end of one of the side walls of the lower shell through a first buckle;

[0026] The second fine threshing cylinder is located in the second opening, one end of the second upper cover is hinged to the upper end of the other side wall of the lower shell, and the other end is detachably connected to the barrier member through a second buckle;

[0027] The guide plate is arranged on the inner wall of the first upper cover;

[0028] The horizontal conveying auger, the first screen and the second screen are all installed in the lower shell, and the second rotating shaft and the third rotating shaft are both rotatably connected to the side wall of the lower shell;

[0029] The feed inlet, slag outlet and grain outlet are provided on the lower shell;

[0030] The feed hopper and the lifting and conveying pipeline are both connected to the lower shell by welding.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a multi-stage threshing device with good threshing effect. Crops are fed into the feed hopper, and the driving mechanism drives the feed rough threshing drum to rotate around its own axis. Crops are roughly threshed by the feed rough threshing drum, and the threshed grains fall to the bottom of the shell through the first screen and are discharged through the grain discharge port. Crops are also transported to the first threshing conveying section of the first fine threshing drum under the action of the feed rough threshing drum. The driving mechanism drives the first fine threshing drum to rotate around its own axis, and the crops after rough threshing are spirally transported from the first threshing conveying section of the first fine threshing drum to the first threshing discharge section. The first fine threshing drum and the first screen plate cooperate to perform the first fine threshing on the crops after rough threshing, and the grains fall to the bottom of the shell through the first screen plate and are discharged through the grain discharge port. The incompletely threshed crops are conveyed to the second fine threshing drum through the window, and the driving mechanism drives the second fine threshing drum to rotate around its own axis. The incompletely threshed crops are spirally conveyed from the second threshing conveying section of the second fine threshing drum to the second threshing discharge section. The incompletely threshed crops are finely threshed for the second time through the cooperation of the second fine threshing drum and the second screen plate. The stalks are discharged from the slag outlet, and the grains fall to the bottom of the shell through the second screen and are also discharged through the grain discharge outlet. It also has the advantages of easy promotion and implementation and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a side structural schematic diagram of the present invention;

[0033] Figure 2 is a schematic diagram of the top view of the structure of the present invention (wherein the first upper cover and the second upper cover are not shown);

[0034] Reference numerals:

[0035] 1-shell; 101-feed hopper; 102-slag outlet; 103-lower shell; 104-first upper cover; 105-second upper cover; 106-guide plate; 2-first fine threshing drum; 201-installation plate; 202-tooth rod; 203-threshing knife; 204-threshing discharge rib; 205-first scraper; 206-reinforcement plate; 3-second fine threshing drum; 301-installation cylinder; 302-spiral conveying blade; 303-threshing rib; 304-second scraper; 4-first screen; 5-second screen; 6-blocking piece; 601-window; 602 - cutting knife; 7- horizontal conveying auger; 8- lifting and conveying auger mechanism; 801- lifting and conveying pipeline; 802- lifting and conveying auger; 803- guide pipe; 9- first impurity removal fan; 10- first suction pipe; 11- separation cylinder; 1101- grain receiving port; 12- dispersion cone; 1201- support cone; 13- second impurity removal fan; 14- second suction pipe; 15- first rotating shaft; 16- second rotating shaft; 17- driving motor; 18- feeding coarse threshing drum; 1801- connecting plate; 1802- connecting rod; 1803- rake teeth; 19- third rotating shaft. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] A multi-stage threshing device comprises a shell 1, and a first fine threshing drum 2 and a second fine threshing drum 3 rotatably installed in the shell 1; a feed hopper 101 is installed at the feed inlet of the shell 1, and a feed coarse threshing drum 18 is installed in the feed hopper 101; the feed coarse threshing drum 18 is located on one side of the first fine threshing drum 2, and the second fine threshing drum 3 is located on the other side of the first fine threshing drum 2, and both are driven by a driving mechanism; a first screen 4 located below the first fine threshing drum 2 and a second screen 5 located below the second fine threshing drum 3 are installed in the shell 1; a baffle 6 located between the first screen 4 and the second screen 5 is installed on the shell 1, and a window 601 is opened on the baffle 6 for the passage of crops that are not completely threshed; the first fine threshing drum 2 It has a first threshing conveying section and a first threshing discharge section which are sequentially arranged along the conveying direction L1 of the crops after coarse threshing, and the second fine threshing drum 3 has a second threshing conveying section and a second threshing discharge section which are sequentially arranged along the conveying direction L2 of the crops that are not completely threshed; the feed port of the shell 1 is located above the first screen 4, and is arranged corresponding to the first threshing conveying section of the first fine threshing drum 2, the slag outlet 102 of the shell 1 is located above the second screen 5, and is arranged corresponding to the second threshing discharge section of the second fine threshing drum 3, the grain discharge port of the shell 1 is located at the bottom of the shell 1, and is located below the first screen 4 and the second screen 5; the first threshing discharge section of the first fine threshing drum 2 and the second threshing conveying section of the second fine threshing drum 3 are both arranged corresponding to the window 601.

[0038] The shell 1 provides installation support for the first fine threshing drum 2, the second fine threshing drum 3, the first screen 4 and the second screen 5. The feed hopper 101 provides installation support for the feed rough threshing drum 18. The first fine threshing drum 2, the second fine threshing drum 3 and the feed rough threshing drum 18 are all horizontally arranged, and the rotation centers of the three are parallel to each other. Preferably, the rotation centers of the first fine threshing drum 2, the second fine threshing drum 3 and the feed rough threshing drum 18 are all horizontally arranged and parallel to each other. The barrier 6 can be a vertically arranged plate-like structure, a vertically arranged mesh structure, or a bracket structure.

[0039] The crops are transported from the feed port, the conveying direction L1 of the crops after rough threshing, the window 601, the conveying direction L2 of the crops that are not completely threshed, and the direction of the slag outlet 102 in sequence. Specifically, the crops are fed into the feed hopper 101, and the driving mechanism drives the feed rough threshing drum 18 to rotate around its own axis. The crops are roughly threshed by the feed rough threshing drum 18, and the threshed grains fall to the bottom of the shell 1 through the first screen 4 and are discharged through the grain discharge port. The crops are also transported to the first threshing conveying section of the first fine threshing drum 2 under the action of the feed rough threshing drum 18, that is, the feed rough threshing drum 18 also plays a role in assisting the feeding of crops. The driving mechanism drives the first fine threshing drum 2 to rotate around its own axis, and the crops after rough threshing are spirally transported from the first threshing conveying section of the first fine threshing drum 2 to the first threshing discharge section. The first fine threshing drum 2 cooperates with the first screen plate 4 to perform the first fine threshing on the crops after rough threshing. The grains fall to the bottom of the shell 1 through the first screen plate 4 and are discharged through the grain discharge port. The crops that are not completely threshed are transported to the second fine threshing drum 3 through the window 601. The driving mechanism drives the second fine threshing drum 3 to rotate around its own axis, and the crops that are not completely threshed are spirally transported from the second threshing conveying section of the second fine threshing drum 3 to the second threshing discharge section. The crops that are not completely threshed are finely threshed for the second time through the cooperation of the second fine threshing drum 3 and the second screen plate 5. The stems are discharged from the slag outlet 102, and the grains fall to the bottom of the shell 1 through the second screen 5 and are also discharged through the grain discharge port. The threshing effect of the crops is improved through three threshing.

[0040] Specifically, the feed rough threshing drum 18 includes a vertically arranged connection disk 1801, and the connection disk 1801 is provided with two, and the two connection disks 1801 are arranged at intervals in the horizontal direction and are coaxially installed through the first rotating shaft 15; the first rotating shaft 15 is rotatably connected to the side wall of the feed hopper 101; the axial direction of the first rotating shaft 15 is parallel to the rotation center of the first fine threshing drum 2; a plurality of feed rake tooth rods are installed between the two connection disks 1801, and the feed rake tooth rods include a connecting rod 1802 parallel to the first rotating shaft 15, and rake teeth 1803 arranged on the outer peripheral surface of the connecting rod 1802; one end of the connecting rod 1802 is connected to one of the connection disks 1801, and the other end is connected to the other connection disk 1801; a plurality of rake teeth 1803 are provided, and the plurality of rake teeth 1803 are arranged at intervals in pairs along the axial direction of the connecting rod 1802. Preferably, the connecting rod 1802 is parallel to the first rotating shaft 15. The rake teeth 1803 are welded to the connecting rod 1802. The connecting plate 1801 is preferably a circular plate. The driving mechanism is in transmission connection with the first rotating shaft 15 to drive the feeding coarse threshing drum 18 to rotate around the axial direction of the first rotating shaft 15. Preferably, the rake teeth 1803 are hook structures.

[0041] The first fine threshing drum 2 has a variety of structural forms. Specifically, the first fine threshing drum 2 includes a vertically arranged mounting plate 201; two mounting plates 201 are provided, and the two mounting plates 201 are arranged at intervals along the conveying direction L1 of the crops after rough threshing, and are coaxially installed through the second rotating shaft 16; the second rotating shaft 16 is rotatably connected to the side wall of the shell 1, and the first rotating shaft 15 is parallel to the second rotating shaft 16; a plurality of threshing and grass discharge knife tooth rods are installed between the two mounting plates 201, and the threshing and grass discharge knife tooth rods include a knife tooth rod 202, and the outer A threshing knife 203 located in the first threshing conveying section and a threshing discharge rib 204 located in the first threshing discharge section are arranged on the circumferential surface; one end of the knife tooth rod 202 is connected to one of the mounting plates 201, and the other end is connected to the other mounting plate 201; a vertically arranged guide plate 106 is connected to the top inner wall of the shell 1, and the guide plate 106 is arranged along the axial spiral direction of the second rotating shaft 16; the guide plates 106 are provided in plurality, and the plurality of guide plates 106 are arranged in pairs along the axial direction of the second rotating shaft 16, and are arranged corresponding to the first threshing conveying section.

[0042] Preferably, a plurality of threshing grass discharge blade tooth rods are provided, and the plurality of threshing grass discharge blade tooth rods are arranged in pairs along the circumference of the second rotating shaft 16. The driving mechanism is in transmission connection with the second rotating shaft 16. The threshing knife 203 and the threshing discharge rib 204 are both welded and connected to the blade tooth rod 202. Preferably, the plurality of threshing grass discharge blade tooth rods are evenly distributed along the circumference of the second rotating shaft 16. The length direction of the blade tooth rod 202 is parallel to the length direction of the second rotating shaft 16.

[0043] The guide plate 106 cooperates with the first fine threshing drum 2 to spirally transport the crops from the first threshing conveying section to the first threshing discharge section, and also plays the role of threshing and cutting the stems. Specifically, the guide plate 106 is welded to the top inner wall of the housing 1. Preferably, there is a gap between the guide plate 106 and the outer end of the threshing knife 203.

[0044] Preferably, a reinforcing plate 206 is also included which is coaxially arranged with the mounting plate 201, the reinforcing plate 206 is located between the two mounting plates 201, and the blade tooth rod 202 of the threshing and grass discharge blade tooth rod is welded and connected to the edge of the reinforcing plate 206. By providing the reinforcing plate 206, the supporting effect of the blade tooth rod 202 is improved, and the structural stability of the first fine threshing cylinder 2 is further improved. Preferably, the mounting plate 201 and the reinforcing plate 206 are both circular plates.

[0045] Preferably, the barrier 6 is provided with a cutting knife 602 used in conjunction with the threshing knife 203, the cutting knife 602 is located above and adjacent to the window 601 and located on the side of the barrier 6 adjacent to the first fine threshing cylinder 2; a plurality of the cutting knives 602 are provided, and the plurality of the cutting knives 602 are arranged in pairs along the axial direction of the blade tooth rod 202. The cutting knife 602 is welded to the barrier 6, and the cutting knife 602 can cut off the stems passing through the window 601, and can also achieve the threshing effect.

[0046] The second fine threshing drum 3 has a variety of structural forms. Specifically, the second fine threshing drum 3 includes a horizontally arranged mounting drum 301, and a spiral conveying blade 302 and a threshing rib structure are arranged on the outer circumferential surface of the mounting drum 301; the mounting drum 301 is rotatably connected to the side wall of the housing 1 through a third rotating shaft 19, and the third rotating shaft 19 is parallel to the second rotating shaft 16; the spiral conveying blade 302 is located in the second threshing conveying section; the threshing rib structure is provided with multiple groups, and the multiple groups of the threshing rib structures are arranged in pairs along the circumference of the mounting drum 301; each group of the threshing rib structure includes a plurality of threshing ribs 303 arranged in pairs along the axial direction of the mounting drum 301. The driving mechanism is in transmission connection with the third rotating shaft 19. The spiral conveying blade 302 and the threshing rib 303 are both welded to the mounting drum 301. The second threshing conveying section and the second threshing discharge section of the second fine threshing drum 3 are both provided with threshing ribs 303. Specifically, the end plates at both ends of the mounting tube 301 are rotatably connected to the side wall of the housing 1 via the third rotating shaft 19 .

[0047] The crops are fed into the feed hopper 101, and the driving mechanism drives the first rotating shaft 15 to rotate around its own axis, driving the feeding rough threshing drum 18 to rotate around the axis of the first rotating shaft 15, and the crops are roughly threshed under the action of the rake teeth 1803, and then the crops are transported to the first threshing conveying section of the first fine threshing drum 2. The driving mechanism drives the second rotating shaft 16 to rotate around its own axis, driving the first fine threshing drum 2 to rotate around the axis of the second rotating shaft 16. The crops are finely threshed for the first time under the action of the threshing knife 203 and the first screen 4. The threshing discharge ribs 204 further thresh the crops and play a role in discharging the crops that are not completely threshed. The crops that are not completely threshed are transported to the second threshing conveying section of the second fine threshing drum 3 through the window 601 through the action of the threshing discharge ribs 204. The driving mechanism drives the third rotating shaft 19 to rotate around its own axis, driving the second fine threshing drum 3 to rotate around the axis of the third rotating shaft 19, and the spiral conveying blade 302 spirally conveys the incompletely threshed crops from the second threshing conveying section to the second threshing discharge section. The threshing ribs 303 and the spiral conveying blades 302 located in the second threshing conveying section jointly perform a second fine threshing on the incompletely threshed crops, thereby improving the threshing effect. The threshing ribs 303 located in the second threshing discharge section can not only further thresh the incompletely threshed crops, but also play a role in discharging the threshed stems from the slag outlet 102.

[0048] The rotation centers of the first fine threshing drum 2, the second fine threshing drum 3 and the feed rough threshing drum 18 are parallel to each other, specifically, the first rotating shaft 15, the second rotating shaft 16 and the third rotating shaft 19 are parallel to each other.

[0049] Preferably, the shell 1 is provided with a horizontal conveying auger 7 located below the first screen 4 and the second screen 5; the grain discharge port is arranged corresponding to the discharge end of the horizontal conveying auger 7; it also includes a lifting and conveying auger mechanism 8 installed outside the shell 1; the lifting and conveying auger mechanism 8 includes a lifting and conveying pipeline 801 connected to the shell 1, and a lifting and conveying auger 802 installed in the lifting and conveying pipeline 801; the lower end feed port of the lifting and conveying pipeline 801 is arranged corresponding to and communicated with the grain discharge port; it also includes an air separation mechanism installed outside the shell 1, the air separation mechanism includes a separation cylinder 11, a material dispersion mechanism, a first suction pipe 10 and a first impurity removal fan 9; the separation cylinder 11 is vertically installed on one side of the shell 1 The top of the separation cylinder 11 is an air suction port, and the lower end is a grain receiving port 1101; the material dispersion mechanism is installed in the separation cylinder 11 and has an inclined dispersion surface; there is a gap between the lower end of the dispersion surface and the inner wall of the separation cylinder 11 for the grains to fall; the upper end discharge port of the lifting and conveying pipeline 801 is connected with the through hole on the side wall of the separation cylinder 11, and is located above the dispersion surface; one end of the first suction pipe 10 is a first connecting port, and the other end is a first slag discharge port; the first connecting port of the first suction pipe 10 is connected to the suction port of the separation cylinder 11, and the first impurity removal fan 9 is installed on the first suction pipe 10 and is used to provide air selection pressure; the horizontal conveying auger 7, the lifting and conveying auger 802 and the first impurity removal fan 9 are all driven by a driving mechanism.

[0050] The seeds falling through the first screen 4 and the second screen 5 are continuously transported to the seed discharge port under the action of the horizontal conveying auger 7. Under the action of the lifting conveying auger 802, the seeds are lifted to the upper end discharge port of the lifting conveying pipe 801. Under the upward thrust of the spiral, the seeds are rushed into the separation cylinder 11 through the through holes on the side wall of the separation cylinder 11, and fall to the dispersion surface of the material dispersion mechanism under the action of their own gravity. The first impurity removal fan 9 provides air selection pressure, and the relatively heavy seeds continue to fall from the gap between the lower end of the dispersion surface and the inner wall of the separation cylinder 11, and are finally discharged from the grain receiving port 1101, while the relatively light impurities such as weed fragments, straw fragments, and empty shells enter the first suction pipe 10 and are discharged from the first slag discharge port.

[0051] The material dispersing mechanism may be a flat plate structure arranged obliquely, the upper end of which is welded to the inner wall of the separation cylinder 11, and the lower end of which is spaced from the inner wall of the separation cylinder 11 for the seeds to fall. Preferably, the material dispersing mechanism comprises a dispersing cone 12 with a small upper end and a large lower end, and the upper surface of the dispersing cone 12 serves as the dispersing surface; the dispersing cone 12 is installed in the separation cylinder 11 through a bracket. The bracket provides a stable installation support for the dispersing cone 12.

[0052] As a further preferred embodiment, the material dispersing mechanism further includes a supporting cone 1201 with a large upper end and a small lower end, the dispersing cone 12 is located above the supporting cone 1201, and the lower end of the dispersing cone 12 is connected to the upper end of the supporting cone 1201. Specifically, the lower end of the dispersing cone 12 is welded to the upper end of the supporting cone 1201. The dispersing cone 12 is connected to the supporting cone 1201 to improve the structural stability of the dispersing cone 12.

[0053] As a preferred embodiment, the taper of the dispersion cone 12 is smaller than the taper of the support cone 1201. This can reduce the overall height of the dispersion cone 12 and the support cone 1201.

[0054] Specifically, the lower end feed port of the lifting and conveying pipeline 801 is welded to the grain discharge port of the shell 1. The upper end discharge port of the lifting and conveying pipeline 801 is connected to the guide pipe 803 located on one side thereof, and the guide pipe 803 extends into the separation cylinder 11 through the through hole on the side wall of the separation cylinder 11, and the discharge port of the guide pipe 803 is located above the dispersion surface.

[0055] The separation cylinder 11 can be installed through a frame. Preferably, the separation cylinder 11 is connected to the guide pipe 803 by welding.

[0056] Preferably, the axial direction of the horizontal conveying auger 7 is perpendicular to the axial direction of the lifting and conveying auger 802.

[0057] Preferably, it also includes a second impurity removal fan 13 and a second suction pipe 14; one end of the second suction pipe 14 is a second connection port, and the other end is a second slag discharge port; the second connection port is connected to the housing 1 and is located below the first screen 4 and the second screen 5, the second impurity removal fan 13 is installed on the second suction pipe 14, and is used to provide air selection pressure; the second impurity removal fan 13 is driven by a driving mechanism. By setting the second impurity removal fan 13 and the second suction pipe 14, the seeds falling from the first screen plate 4 and the second screen plate 5 are pre-impurified, and then the second impurity removal is carried out through the separation cylinder 11, the material dispersion mechanism, the first impurity removal fan 9 and the first suction pipe 10, so as to further improve the impurity removal effect.

[0058] Since the guide plate 106 is arranged corresponding to the first threshing conveying section of the first fine threshing drum 2, and the first threshing discharge section of the first fine threshing drum 2 lacks the spiral conveying effect on the crops, the stems are easily stuck on the first screen plate 4 and the corresponding part of the first threshing discharge section. Preferably, it also includes a first scraper 205 connected to the threshing discharge rib 204, and the length direction of the first scraper 205 is parallel to the length direction of the knife tooth rod 202; one end of the first scraper 205 in the width direction is close to the rotation center of the first fine threshing drum 2, and the other end of the first scraper 205 in the width direction is far away from the rotation center of the first fine threshing drum 2, and there is a gap between the first screen 4. Specifically, the side of the first scraper 205 is welded to the threshing discharge rib 204. The first scraper 205 is located in the first threshing discharge section. By setting the first scraper 205, it is convenient to scrape off the stems stuck on the first screen plate 4 and the corresponding part of the first threshing discharge section.

[0059] Since the second threshing discharge section of the second fine threshing drum 3 lacks the spiral conveying effect on crops, the stems are easily stuck on the corresponding part of the second screen plate 5 and the second threshing discharge section. Preferably, it also includes a second scraper 304 connected to the threshing rib 303 and located in the second threshing discharge section, the length direction of the second scraper 304 is parallel to the length direction of the mounting tube 301, one end of the second scraper 304 in the width direction is adjacent to the outer peripheral surface of the mounting tube 301, and the other end of the second scraper 304 in the width direction is away from the outer peripheral surface of the mounting tube 301, and there is a gap between the second screen 5. Specifically, the side of the second scraper 304 is welded to the threshing rib 303. By setting the second scraper 304, it is convenient to scrape off the stems stuck on the corresponding part of the second screen plate 5 and the second threshing discharge section.

[0060] The shell 1 can be an integral structure. Preferably, the shell 1 includes a lower shell 103 with an opening facing upward, the baffle 6 is installed on the lower shell 103, and separates the upper end opening of the lower shell 103 into a first opening and a second opening; it also includes a first upper cover 104 for covering the first opening, and a second upper cover 105 for covering the second opening; the first fine threshing drum 2 is located in the first opening, one end of the first upper cover 104 is hinged to the baffle 6, and the other end is detachably connected to the upper end of one of the side walls of the lower shell 103 through a first buckle; the second fine threshing drum 3 is located in the second opening In the opening, one end of the second upper cover 105 is hinged to the upper end of the other side wall of the lower shell 103, and the other end is detachably connected to the barrier 6 through a second buckle; the guide plate 106 is arranged on the inner wall of the first upper cover 104; the horizontal conveying auger 7, the first screen 4 and the second screen 5 are all installed in the lower shell 103, and the second rotating shaft 16 and the third rotating shaft 19 are both rotatably connected to the side wall of the lower shell 103; the feed port, the slag outlet 102 and the seed discharge port are opened on the lower shell 103; the feed hopper 101 and the lifting and conveying pipeline 801 are both welded to the lower shell 103. Opening the first upper cover 104 is convenient for the maintenance of the first fine threshing drum 2. Opening the second upper cover 105 is convenient for the maintenance of the second fine threshing drum 3.

[0061] Specifically, the driving mechanism includes a driving motor 17 and a transmission structure. The driving motor 17 is installed outside the housing 1 and is close to the feed port. The first impurity removal fan 9, the second impurity removal fan 13 and the lifting and conveying auger mechanism 8 are all located at one end of the housing 1 away from the driving motor 17. The driving motor 17 drives the first rotating shaft 15 to rotate around its own axis, drives the second rotating shaft 16 to rotate around its own axis, drives the horizontal conveying auger 7 to rotate around its own axis, drives the blades of the first impurity removal fan 9 to rotate, drives the blades of the second impurity removal fan 13 to rotate, and drives the third rotating shaft 19 to rotate around its own axis through the cooperation of the pulley and the belt. The driving motor 17 drives the lifting and conveying auger 802 to rotate around its own axis through the gear set.

[0062] The embodiments of the specific implementation are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. All equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Multi-stage threshing device, characterized in that: The invention comprises a shell (1), and a first fine threshing drum (2) and a second fine threshing drum (3) rotatably mounted in the shell (1); a feed hopper (101) is mounted at the feed inlet of the shell (1), and a feed rough threshing drum (18) is mounted in the feed hopper (101); the feed rough threshing drum (18) is located on one side of the first fine threshing drum (2), and the second fine threshing drum (3) is located on the other side of the first fine threshing drum (2), and both are driven by a driving mechanism; The housing (1) is provided with a first screen (4) located below the first fine threshing drum (2) and a second screen (5) located below the second fine threshing drum (3); the housing (1) is provided with a baffle (6) located between the first screen (4) and the second screen (5), and the baffle (6) is provided with a window (601) for the passage of crops that have not been completely threshed; the first fine threshing drum (2) has a first threshing conveying section and a first threshing discharge section arranged in sequence along a conveying direction L1 of crops after rough threshing, and the second fine threshing drum (3) has a second threshing discharge section arranged in sequence along a conveying direction L2 of crops that have not been completely threshed. The shell (1) has a first threshing conveying section and a second threshing discharge section; the feed port of the shell (1) is located above the first screen (4) and is arranged corresponding to the first threshing conveying section of the first fine threshing drum (2); the slag outlet (102) of the shell (1) is located above the second screen (5) and is arranged corresponding to the second threshing discharge section of the second fine threshing drum (3); the grain discharge port of the shell (1) is located at the bottom of the shell (1) and is located below the first screen (4) and the second screen (5); the first threshing discharge section of the first fine threshing drum (2) and the second threshing conveying section of the second fine threshing drum (3) are both arranged corresponding to the window (601).

2. The multi-stage threshing device according to claim 1, characterized in that: The feeding rough threshing drum (18) comprises a vertically arranged connecting disk (1801), wherein two connecting disks (1801) are arranged at intervals in the horizontal direction and are coaxially installed via a first rotating shaft (15); the first rotating shaft (15) is rotatably connected to the side wall of the feeding hopper (101); the axial direction of the first rotating shaft (15) is parallel to the rotation center of the first fine threshing drum (2); a connecting disk (1801) is installed between the two connecting disks (1801). A plurality of feeding rake tooth rods, each of which comprises a connecting rod (1802) parallel to a first rotating shaft (15), and rake teeth (1803) arranged on the outer peripheral surface of the connecting rod (1802); one end of the connecting rod (1802) is connected to one of the connecting disks (1801), and the other end is connected to another connecting disk (1801); a plurality of the rake teeth (1803) are arranged in pairs along the axial direction of the connecting rod (1802).

3. The multi-stage threshing device according to claim 2, characterized in that: The first fine threshing drum (2) comprises a vertically arranged mounting plate (201); two mounting plates (201) are provided, and the two mounting plates (201) are arranged at intervals along the conveying direction L1 of the crops after rough threshing and are coaxially installed via a second rotating shaft (16); the second rotating shaft (16) is rotatably connected to the side wall of the shell (1), and the first rotating shaft (15) is parallel to the second rotating shaft (16); a plurality of threshing and grass discharge blade tooth rods are installed between the two mounting plates (201), and the threshing and grass discharge blade tooth rods comprise a blade tooth rod (202), and a threshing blade (203) located in the first threshing conveying section and a threshing and conveying rib (204) located in the first threshing discharge section are provided on the outer peripheral surface of the blade tooth rod (202); one end of the blade tooth rod (202) is connected to one of the mounting plates (201), and the other end is connected to the other mounting plate (201); A vertically arranged guide plate (106) is connected to the inner wall of the top of the shell (1), and the guide plate (106) is arranged along the axial spiral direction of the second rotating shaft (16); a plurality of guide plates (106) are provided, and the plurality of guide plates (106) are arranged in pairs along the axial direction of the second rotating shaft (16), and are arranged corresponding to the first threshing and conveying section.

4. The multi-stage threshing device according to claim 2, characterized in that: The second fine threshing drum (3) comprises a horizontally arranged mounting cylinder (301), wherein a spiral conveying blade (302) and a threshing rib structure are arranged on the outer circumferential surface of the mounting cylinder (301); the mounting cylinder (301) is rotatably connected to the side wall of the shell (1) via a third rotating shaft (19), wherein the third rotating shaft (19) is parallel to the second rotating shaft (16); the spiral conveying blade (302) is located in the second threshing conveying section; the threshing rib structure is provided in a plurality of groups, wherein the plurality of groups of the threshing rib structures are arranged in pairs along the circumferential direction of the mounting cylinder (301); and each group of the threshing rib structure comprises a plurality of threshing ribs (303) arranged in pairs along the axial direction of the mounting cylinder (301).

5. The multi-stage threshing device according to claim 4, characterized in that: The housing (1) is provided with a horizontal conveying auger (7) located below the first screen (4) and the second screen (5); the seed discharge port is arranged corresponding to the discharge end of the horizontal conveying auger (7); It also includes a lifting and conveying auger mechanism (8) installed outside the shell (1); the lifting and conveying auger mechanism (8) includes a lifting and conveying pipeline (801) connected to the shell (1), and a lifting and conveying auger (802) installed in the lifting and conveying pipeline (801); the lower end feed port of the lifting and conveying pipeline (801) is arranged corresponding to and connected to the seed discharge port; It also includes an air separation mechanism installed outside the housing (1), the air separation mechanism including a separation cylinder (11), a material dispersion mechanism, a first air suction pipe (10) and a first impurity removal fan (9); The separation cylinder (11) is vertically mounted on one side of the shell (1); the top end of the separation cylinder (11) is an air suction port, and the bottom end is a grain receiving port (1101); the material dispersion mechanism is mounted in the separation cylinder (11) and has an inclined dispersion surface; a gap is provided between the bottom end of the dispersion surface and the inner wall of the separation cylinder (11) for the grains to fall; The upper end discharge port of the lifting and conveying pipeline (801) is connected to the through hole on the side wall of the separation cylinder (11) and is located above the dispersion surface; one end of the first suction pipe (10) is a first connection port, and the other end is a first slag discharge port; the first connection port of the first suction pipe (10) is connected to the suction port of the separation cylinder (11), and the first impurity removal fan (9) is installed on the first suction pipe (10) and is used to provide air selection pressure; The horizontal conveying auger (7), the lifting conveying auger (802) and the first impurity removal fan (9) are all driven by a driving mechanism.

6. The multi-stage threshing device according to claim 4, characterized in that: The material dispersing mechanism comprises a dispersing cone (12) with a small upper end and a large lower end, and the upper surface of the dispersing cone (12) serves as the dispersing surface; the dispersing cone (12) is installed in the separation cylinder (11) through a bracket.

7. The multi-stage threshing device according to claim 1, characterized in that: It also includes a second impurity removal fan (13) and a second air suction pipe (14); one end of the second air suction pipe (14) is a second connection port, and the other end is a second slag discharge port; the second connection port is connected to the housing (1) and is located below the first screen (4) and the second screen (5); the second impurity removal fan (13) is installed on the second air suction pipe (14) and is used to provide air selection pressure; The second impurity removal fan (13) is driven by a driving mechanism.

8. The multi-stage threshing device according to claim 3, characterized in that: It also comprises a first scraper (205) connected to the threshing and conveying rib (204), wherein the length direction of the first scraper (205) is parallel to the length direction of the blade tooth rod (202); one end of the first scraper (205) in the width direction is close to the rotation center of the first fine threshing drum (2), and the other end of the first scraper (205) in the width direction is far away from the rotation center of the first fine threshing drum (2), and there is a gap between the first scraper (205) and the first screen (4).

9. The multi-stage threshing device according to claim 4, characterized in that: It also includes a second scraper (304) connected to the threshing rib (303) and located in the second threshing and discharging section, the length direction of the second scraper (304) is parallel to the length direction of the mounting tube (301), one end of the second scraper (304) in the width direction is adjacent to the outer peripheral surface of the mounting tube (301), and the other end of the second scraper (304) in the width direction is away from the outer peripheral surface of the mounting tube (301) and has a gap with the second screen (5).

10. The multi-stage threshing device according to claim 4, characterized in that: The housing (1) comprises a lower housing (103) with an opening facing upward, and the barrier member (6) is mounted on the lower housing (103) and separates the upper opening of the lower housing (103) into a first opening and a second opening; It also includes a first upper cover (104) for covering the first opening, and a second upper cover (105) for covering the second opening; The first fine threshing drum (2) is located in the first opening, one end of the first upper cover (104) is hinged to the barrier member (6), and the other end is detachably connected to the upper end of one of the side walls of the lower shell (103) via a first buckle; The second fine threshing drum (3) is located in the second opening, one end of the second upper cover (105) is hinged to the upper end of the other side wall of the lower shell (103), and the other end is detachably connected to the barrier member (6) via a second buckle; The guide plate (106) is arranged on the inner wall of the first upper cover (104); The horizontal conveying auger (7), the first screen (4) and the second screen (5) are all installed in the lower shell (103), and the second rotating shaft (16) and the third rotating shaft (19) are both rotatably connected to the side wall of the lower shell (103); The feed inlet, the slag outlet (102) and the seed discharge outlet are provided on the lower shell (103); The feed hopper (101) and the lifting and conveying pipeline (801) are both connected to the lower shell (103) by welding.

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