Multi-stage threshing device

Abstract

The utility model 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 utility model belongs to the technical field of threshing of gramineous crops, and particularly relates to a multi-stage threshing device. Background Technique

[0002] A threshing machine in agriculture refers to a mechanical device that can separate crop grains from stalks, and is mainly used for threshing crops such as wheat, rice, rapeseed, sorghum, highland barley, coix seed, mung bean, and soybean.

[0003] Generally, a threshing machine includes a housing and a threshing drum installed in the inner cavity of the housing; one end of the housing is a feeding end, and the other end is a slag discharging end; the threshing drum rotates around its own horizontal axis through a motor and feeds materials in the direction from the feeding end to the slag discharging end; a feeding port is provided at the upper part of the housing at the feeding end, a slag discharging port is provided at one side of the housing at the slag discharging end, and a discharging port is provided at the bottom of the housing. The feeding port, the slag discharging port, and the discharging port are all communicated with the inner cavity of the housing. Crops are fed into the inner cavity of the housing through the feeding port, and the motor drives the threshing drum to rotate around its own horizontal axis, so that the grains and stalks of the crops are separated during the process of being rotated and conveyed. The stalks are discharged from the slag discharging port, and the grains are discharged from the discharging port.

[0004] Chinese patent document with the application number 202110724244.4 discloses a multi-crop threshing machine with a coaxial multi-drum and reversible threshing teeth. The threshing drum is installed in the inner cavity of the housing and rotates around its own axis through a motor. One end of the housing is a feeding end, and the other end is a slag discharging end. The threshing drum includes an adjacent threshing section and a discharging section. The threshing section is arranged corresponding to the feeding port, and the discharging section is arranged corresponding to the slag discharging port. The threshing section includes a threshing tooth rod, a first mounting disc, and a second mounting disc. There are several threshing tooth rods, and several threshing tooth rods are detachably installed between the first mounting disc and the second mounting disc through the flipping mounting plates at both ends. Each threshing tooth rod includes a tooth rod and different threshing tooth combinations for threshing different crops in the circumferential direction of the tooth rod. The discharging section includes a third mounting disc and several straw discharging tooth rods. The third mounting disc is located at the outer end of the second mounting disc, and the first mounting disc, the second mounting disc, and the third mounting disc are coaxially arranged. The straw discharging tooth rods are installed between the second mounting disc and the third mounting disc, and several straw discharging teeth are arranged along the length direction of the straw discharging tooth rods. Crops are fed into the inner cavity of the housing through the feeding port, the motor drives the threshing drum to rotate around its own horizontal axis, the crops are spirally conveyed in the direction from the feeding end to the slag discharging end, and the grains and stalks are separated under the action of the threshing section. The grains are discharged from the discharging port. The stalks are conveyed to the discharging section and finally discharged from the slag discharging port. However, in the actual use process, it is found that there are still some grains remaining on the stalks discharged from the slag discharging port, and there is a technical problem of poor threshing effect. Content of the Utility Model

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

[0006] The technical solution adopted by the present utility model to solve its technical problem is: a multi-stage threshing device, including a housing, and a first fine threshing drum and a second fine threshing drum rotatably installed in the housing; a feed hopper is installed at the feed inlet of the housing, 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] A first screen is installed in the housing below the first fine threshing drum, and a second screen is installed below the second fine threshing drum; a partition member is installed on the housing between the first screen and the second screen, and a window for the unthreshed crops to pass through is opened on the partition member; the first fine threshing drum has a first threshing conveying section and a first threshing discharging section arranged in sequence along the conveying direction L1 of the threshed crops, and the second fine threshing drum has a second threshing conveying section and a second threshing discharging section arranged in sequence along the conveying direction L2 of the unthreshed crops; the feed inlet of the housing is located above the first screen and is arranged corresponding to the first threshing conveying section of the first fine threshing drum, the slag discharge port of the housing is located above the second screen and is arranged corresponding to the second threshing discharging section of the second fine threshing drum, the grain discharge port of the housing is located at the bottom of the housing and is located below the first screen and the second screen; the first threshing discharging 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] Further, the feed rough threshing drum includes a vertically arranged connecting plate, and there are two connecting plates, 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 drum; a plurality of feed rake teeth rods are installed between the two connecting plates, and the feed rake teeth 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; there are a plurality of rake teeth, and the plurality of rake teeth are arranged at intervals in pairs along the axial direction of the connecting rod.

[0009] Further, the first fine threshing cylinder includes a vertically arranged mounting plate; there are two mounting plates, 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 housing, and the first rotating shaft is parallel to the second rotating shaft; a plurality of threshing and straw discharging cutter teeth rods are installed between the two mounting plates, and the threshing and straw discharging cutter teeth rod includes a cutter teeth rod, on the outer peripheral surface of which there are threshing knives located in the first threshing conveying section and threshing and discharging ribs located in the first threshing discharging section; one end of the cutter teeth rod is connected to one mounting plate, and the other end is connected to the other mounting plate.

[0010] A vertically arranged guide plate is connected to the inner wall of the top of the housing, 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 at intervals in pairs along the axial direction of the second rotating shaft and are arranged corresponding to the first threshing conveying section.

[0011] Further, the second fine threshing cylinder includes a horizontally arranged mounting cylinder, on the outer peripheral surface of which there are spiral conveying blades and a threshing rib structure; the mounting cylinder is rotatably connected to the side wall of the housing through a third rotating shaft, and the third rotating shaft is parallel to the second rotating shaft; the spiral conveying blades are located in the second threshing conveying section; there are multiple groups of threshing rib structures, and the multiple groups of threshing rib structures are arranged at intervals in pairs along the circumferential direction of the mounting cylinder; each group of threshing rib structures includes multiple threshing ribs arranged at intervals in pairs along the axial direction of the mounting cylinder.

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

[0013] It further includes a lifting and conveying auger mechanism installed outside the housing; the lifting and conveying auger mechanism includes a lifting and conveying pipeline connected to the housing and a lifting and conveying auger installed in the lifting and conveying pipeline; the lower feed port of the lifting and conveying pipeline is arranged corresponding to and communicated with the grain discharge port;

[0014] It further includes a pneumatic separation mechanism installed outside the housing, and the pneumatic 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 housing, the top end 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 spacing for the grains to fall between the lower end of the dispersion surface and the inner wall of the separation cylinder.

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

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

[0018] Further, the material dispersion mechanism includes 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] Further, it further includes a second impurity removal fan and a second air suction pipe; one end of the second air suction pipe is the second connection port, and the other end is the second slag discharge port; the second connection port is connected to the housing 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 separation pressure;

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

[0021] Further, it further includes a first scraper connected to the threshing discharge rib, and the length direction of the first scraper is parallel to the length direction of the cutter bar; one end in the width direction of the first scraper is close to the rotation center of the first fine threshing drum, and the other end in the width direction of the first scraper is far from the rotation center of the first fine threshing drum and has a gap with the first screen.

[0022] Further, it further includes a second scraper connected to the threshing rib and located in the second threshing discharge section, and the length direction of the second scraper is parallel to the length direction of the installation cylinder, one end in the width direction of the second scraper is adjacent to the outer peripheral surface of the installation cylinder, and the other end in the width direction of the second scraper is far from the outer peripheral surface of the installation cylinder and has a gap with the second screen.

[0023] Further, the housing includes a lower housing with an upward opening, and the partition member is installed on the lower housing and divides the upper opening of the lower housing into a first opening and a second opening;

[0024] It further 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 partition member, and the other end is detachably connected to the upper end of one of the side walls of the lower housing through a first buckle;

[0026] The second fine threshing drum 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 housing, and the other end is detachably connected to the partition member through a second buckle.

[0027] The deflector is arranged on the inner wall of the first upper cover.

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

[0029] The feed inlet, the slag outlet and the grain discharge outlet are opened on the lower housing.

[0030] The feed hopper and the lifting and conveying pipeline are both welded to the lower housing.

[0031] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model provides a multi-stage threshing device with good threshing effect. The crops are fed into the feed hopper, and the driving mechanism drives the feed rough threshing drum to rotate around its own axis. The crops are roughly threshed by the feed rough threshing drum, and the threshed grains fall to the bottom of the housing through the first sieve and are discharged through the grain discharge outlet. The crops are also conveyed to the first threshing and 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 roughly threshed crops are spirally conveyed from the first threshing and conveying section to the first threshing discharge section of the first fine threshing drum. The first fine threshing of the roughly threshed crops is carried out through the cooperation of the first fine threshing drum and the first sieve plate, and the grains fall to the bottom of the housing through the first sieve plate and are discharged through the grain discharge outlet. The incompletely threshed crops are conveyed to the second fine threshing drum through the window. The driving mechanism drives the second fine threshing drum to rotate around its own axis, and the incompletely threshed crops are spirally conveyed from the second threshing and conveying section to the second threshing discharge section of the second fine threshing drum. The second fine threshing of the incompletely threshed crops is carried out through the cooperation of the second fine threshing drum and the second sieve plate. The stalks are discharged through the slag outlet, and the grains fall to the bottom of the housing through the second sieve and are also discharged through the grain discharge outlet. It also has the advantages of being convenient for popularization and implementation, high reliability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the side view structural schematic diagram of the present utility model;

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

[0034] Reference numerals:

[0035] 1 - housing; 101 - feed hopper; 102 - slag outlet; 103 - lower housing; 104 - first upper cover; 105 - second upper cover; 106 - deflector; 2 - first fine threshing cylinder; 201 - mounting disc; 202 - cutter bar; 203 - threshing knife; 204 - threshing discharge rib; 205 - first scraper; 206 - reinforcement disc; 3 - second fine threshing cylinder; 301 - mounting cylinder; 302 - spiral conveyor blade; 303 - threshing rib; 304 - second scraper; 4 - first screen; 5 - second screen; 6 - partition member; 601 - window; 602 - cutting knife; 7 - horizontal conveyor auger; 8 - elevating conveyor auger mechanism; 801 - elevating conveyor pipe; 802 - elevating conveyor auger; 803 - deflector pipe; 9 - first cleaning fan; 10 - first suction pipe; 11 - separating cylinder; 1101 - grain receiving port; 12 - dispersion cone; 1201 - support cone; 13 - second cleaning fan; 14 - second suction pipe; 15 - first rotating shaft; 16 - second rotating shaft; 17 - drive motor; 18 - feed rough threshing cylinder; 1801 - connecting disc; 1802 - connecting rod; 1803 - harrow teeth; 19 - third rotating shaft. Detailed implementation manner

[0036] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0037] Multi-stage threshing device, including a housing 1, and a first fine threshing drum 2 and a second fine threshing drum 3 rotatably installed in the housing 1; a feed hopper 101 is installed at the feed inlet of the housing 1, and a feed rough threshing drum 18 is installed in the feed hopper 101; the feed rough threshing drum 18 is located on one side of the first fine threshing drum 2, 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 drive mechanism; a first screen 4 is installed in the housing 1 below the first fine threshing drum 2, and a second screen 5 is installed below the second fine threshing drum 3; a partition member 6 is installed on the housing 1 between the first screen 4 and the second screen 5, and a window 601 for unthreshed crops to pass through is opened on the partition member 6; the first fine threshing drum 2 has a first threshing conveying section and a first threshing discharging section arranged in sequence along the conveying direction L1 of the rough threshed crops, and the second fine threshing drum 3 has a second threshing conveying section and a second threshing discharging section arranged in sequence along the conveying direction L2 of the unthreshed crops; the feed inlet of the housing 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 housing 1 is located above the second screen 5 and is arranged corresponding to the second threshing discharging section of the second fine threshing drum 3, the grain discharge port of the housing 1 is located at the bottom of the housing 1 and is located below the first screen 4 and the second screen 5; the first threshing discharging 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 housing 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 in pairs. 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 are parallel to each other in pairs. The partition member 6 can be a vertically arranged plate-like structure, can also be a vertically arranged mesh structure, or can also be 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, a cutting knife 602 for cooperating with the threshing knife 203 is provided on the partition member 6. The cutting knife 602 is located adjacent above the window 601 and on the side of the partition member 6 adjacent to the first fine threshing drum 2. A plurality of the cutting knives 602 are provided, and the plurality of cutting knives 602 are arranged at intervals in pairs along the axial direction of the cutter bar 202. The cutting knife 602 is welded to the partition member 6. The cutting knife 602 can cut off the stalks passing through the window 601 and can also achieve the effect of threshing.

[0046] The second fine threshing drum 3 has various structural forms. Specifically, the second fine threshing drum 3 includes a horizontally arranged mounting cylinder 301, and a spiral conveying blade 302 and a threshing rib structure are provided on the outer peripheral surface of the mounting cylinder 301. The mounting cylinder 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 and conveying section. A plurality of groups of the threshing rib structures are provided, and the plurality of groups of threshing rib structures are arranged at intervals in pairs along the circumferential direction of the mounting cylinder 301. Each group of the threshing rib structures includes a plurality of threshing ribs 303 arranged at intervals in pairs along the axial direction of the mounting cylinder 301. The driving mechanism is in transmission connection with the third rotating shaft 19. The spiral conveying blade 302 and the threshing ribs 303 are both welded to the mounting cylinder 301. Threshing ribs 303 are provided in both the second threshing and conveying section and the second threshing and discharging section of the second fine threshing drum 3. Specifically, the end plates at both ends of the mounting cylinder 301 are rotatably connected to the side wall of the housing 1 through the third rotating shaft 19.

[0047] The crop is fed into the feed hopper 101. The driving mechanism drives the first rotating shaft 15 to rotate about its own axis, driving the feed rough threshing drum 18 to rotate about the axis of the first rotating shaft 15. The crop is roughly threshed under the action of the rake teeth 1803, and then the crop is conveyed to the first threshing and conveying section of the first fine threshing drum 2. The driving mechanism drives the second rotating shaft 16 to rotate about its own axis, driving the first fine threshing drum 2 to rotate about the axis of the second rotating shaft 16. The crop is finely threshed for the first time under the action of the threshing knife 203 and the first sieve 4. The threshing discharge ribs 204 further thresh the crop and play a role in discharging the crop that is not completely threshed. The crop that is not completely threshed is conveyed to the second threshing and conveying section of the second fine threshing drum 3 through the window 601 under the action of the threshing discharge ribs 204. The driving mechanism drives the third rotating shaft 19 to rotate about its own axis, driving the second fine threshing drum 3 to rotate about the axis of the third rotating shaft 19. The spiral conveying blade 302 spirally conveys the crop that is not completely threshed from the second threshing and conveying section to the second threshing discharge section. The threshing ribs 303 located in the second threshing and conveying section and the spiral conveying blade 302 jointly perform a second fine threshing on the crop that is not completely threshed, improving the threshing effect. The threshing ribs 303 located in the second threshing discharge section can not only further thresh the crop that is not completely threshed, but also play a role in discharging the threshed stalks 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 in pairs, specifically referring to that the first rotating shaft 15, the second rotating shaft 16 and the third rotating shaft 19 are parallel to each other in pairs.

[0049] Preferably, a horizontal conveying auger 7 is installed in the housing 1 and is 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; further included is a lifting and conveying auger mechanism 8 installed outside the housing 1; the lifting and conveying auger mechanism 8 includes a lifting and conveying pipeline 801 connected to the housing 1, and a lifting and conveying auger 802 installed in the lifting and conveying pipeline 801; the lower feed port of the lifting and conveying pipeline 801 is arranged corresponding to and communicated with the grain discharge port; further included is a pneumatic separation mechanism installed outside the housing 1, the pneumatic separation mechanism includes a separation cylinder 11, a material dispersion mechanism, a first suction air pipe 10 and a first impurity removal fan 9; the separation cylinder 11 is vertically installed on one side of the housing 1, the top end of the separation cylinder 11 is a 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 spacing for the grains to fall between the lower end of the dispersion surface and the inner wall of the separation cylinder 11; the upper discharge port of the lifting and conveying pipeline 801 is communicated with a through hole on the side wall of the separation cylinder 11 and is located above the dispersion surface; one end of the first suction air 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 air 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 air pipe 10 and is used to provide pneumatic separation 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 grains falling through the first screen 4 and the second screen 5 are continuously conveyed to the grain discharge port under the action of the horizontal conveying auger 7, and under the action of the lifting and conveying auger 802, the grains are lifted to the upper discharge port of the lifting and conveying pipeline 801. Under the action of the spiral upward thrust, the grains rush into the separation cylinder 11 through the through hole on the side wall of the separation cylinder 11 and fall onto the dispersion surface of the material dispersion mechanism under the action of their own gravity. The first impurity removal fan 9 provides pneumatic separation pressure. The grains with relatively heavier weight continue to fall from the spacing between the lower end of the dispersion surface and the inner wall of the separation cylinder 11 and finally are discharged from the grain receiving port 1101, while the impurities such as relatively lighter weed fragments, straw fragments, and empty shells enter the first suction air pipe 10 and are discharged from the first slag discharge port.

[0051] The material dispersion mechanism can be a flat plate structure arranged obliquely, the upper end of which is welded to the inner wall of the separation cylinder 11, and there is a spacing for the grains to fall between the lower end of it and the inner wall of the separation cylinder 11. Preferably, the material dispersion mechanism includes a dispersion cone 12 with a smaller upper end and a larger lower end, and the upper surface of the dispersion cone 12 serves as the dispersion surface; the dispersion cone 12 is installed in the separation cylinder 11 through a bracket. The bracket provides stable installation support for the dispersion cone 12.

[0052] As a further preference, the material dispersion mechanism further includes a support cone 1201 with a larger upper end and a smaller lower end. The dispersion cone 12 is located above the support cone 1201, and the lower end of the dispersion cone 12 is connected to the upper end of the support cone 1201. Specifically, the lower end of the dispersion cone 12 is welded to the upper end of the support cone 1201. The connection between the dispersion cone 12 and the support cone 1201 improves the structural stability of the dispersion cone 12.

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

[0054] Specifically, the lower feed port of the lifting conveying pipe 801 is welded to the grain discharge port of the housing 1. The upper discharge port of the lifting conveying pipe 801 is connected to a diversion pipe 803 on its own side. The diversion pipe 803 extends into the separation cylinder 11 through a through hole on the side wall of the separation cylinder 11, and the discharge port of the diversion 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 welded to the diversion pipe 803.

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

[0057] Preferably, it further 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 separation 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 grains falling from the first sieve plate 4 and the second sieve plate 5 are pre-removed of impurities, and then through the separation cylinder 11, the material dispersion mechanism, the first impurity removal fan 9 and the first suction pipe 10, a second impurity removal is carried out to further improve the impurity removal effect.

[0058] Since the deflector 106 is arranged corresponding to the first threshing and conveying section of the first fine threshing cylinder 2, the first threshing and discharging section of the first fine threshing cylinder 2 lacks the spiral conveying effect on crops, so the stalks are easily stuck at the corresponding position between the first sieve plate 4 and the first threshing and discharging section. Preferably, it further includes a first scraper 205 connected to the threshing and discharging rib 204, and the length direction of the first scraper 205 is parallel to the length direction of the cutter bar 202; one end in the width direction of the first scraper 205 is close to the rotation center of the first fine threshing cylinder 2, and the other end in the width direction of the first scraper 205 is far from the rotation center of the first fine threshing cylinder 2 and has a gap with the first sieve 4. Specifically, the side surface of the first scraper 205 is welded to the threshing and discharging rib 204. The first scraper 205 is located in the first threshing and discharging section. By providing the first scraper 205, it is convenient to scrape off the stalks stuck at the corresponding position between the first sieve plate 4 and the first threshing and discharging section.

[0059] Since the second threshing and discharging section of the second fine threshing cylinder 3 lacks the spiral conveying effect on crops, the stalks are easily stuck at the corresponding position between the second sieve plate 5 and the second threshing and discharging section. Preferably, it further includes a second scraper 304 connected to the threshing rib 303 and located in the second threshing and conveying section. The length direction of the second scraper 304 is parallel to the length direction of the mounting cylinder 301. One end in the width direction of the second scraper 304 is adjacent to the outer peripheral surface of the mounting cylinder 301, and the other end in the width direction of the second scraper 304 is far from the outer peripheral surface of the mounting cylinder 301 and has a gap with the second sieve 5. Specifically, the side surface of the second scraper 304 is welded to the threshing rib 303. By providing the second scraper 304, it is convenient to scrape off the stalks stuck at the corresponding position between the second sieve plate 5 and the second threshing and discharging section.

[0060] The housing 1 can be an integral structure. Preferably, the housing 1 includes a lower housing 103 with an upward opening. The partition member 6 is installed on the lower housing 103 and divides the upper end opening of the lower housing 103 into a first opening and a second opening. It further 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 cylinder 2 is located in the first opening. One end of the first upper cover 104 is hinged to the partition member 6, and the other end is detachably connected to the upper end of one side wall of the lower housing 103 through a first buckle. The second fine threshing cylinder 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 housing 103, and the other end is detachably connected to the partition member 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 housing 103. The second rotating shaft 16 and the third rotating shaft 19 are both rotatably connected to the side wall of the lower housing 103. The feed inlet, the slag outlet 102 and the grain discharge outlet are opened on the lower housing 103. The feed hopper 101 and the lifting and conveying pipeline 801 are both welded to the lower housing 103. Opening the first upper cover 104 facilitates the maintenance of the first fine threshing cylinder 2. Opening the second upper cover 105 facilitates the maintenance of the second fine threshing cylinder 3.

[0061] Specifically, the drive mechanism includes a drive motor 17 and a transmission structure. The drive motor 17 is installed outside the housing 1 and is close to the feed inlet. 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 drive motor 17. The drive 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 belt pulleys and belts. The drive motor 17 drives the lifting and conveying auger 802 to rotate around its own axis through a gear set.

[0062] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Any equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. Multi-stage threshing device, characterized in that: Comprising a housing (1), a first fine threshing drum (2) and a second fine threshing drum (3) rotatably mounted in the housing (1); a feed hopper (101) is installed at the feed inlet of the housing (1), and a feed rough threshing drum (18) is installed in the feed hopper (101); the feed rough threshing drum (18) is located on one side of the first fine threshing drum (2), 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 drive mechanism; A first screen (4) is installed in the housing (1) below the first fine threshing drum (2), and a second screen (5) is installed below the second fine threshing drum (3); a partition member (6) is installed on the housing (1) between the first screen (4) and the second screen (5), and a window (601) for the uncompletely threshed crops to pass through is provided on the partition member (6); the first fine threshing drum (2) has a first threshing conveying section and a first threshing discharging section arranged in sequence along the conveying direction L1 of the roughly threshed crops, and the second fine threshing drum (3) has a second threshing conveying section and a second threshing discharging section arranged in sequence along the conveying direction L2 of the uncompletely threshed crops; the feed inlet of the housing (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 housing (1) is located above the second screen (5) and is arranged corresponding to the second threshing discharging section of the second fine threshing drum (3), the grain discharge port of the housing (1) is located at the bottom of the housing (1) and is located below the first screen (4) and the second screen (5); the first threshing discharging 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, wherein: The feed rough threshing drum (18) includes a vertically arranged connecting plate (1801), and there are two connecting plates (1801), the two connecting plates (1801) are arranged at intervals in the horizontal direction and are coaxially installed through a 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 teeth rods are installed between the two connecting plates (1801), and the feed rake teeth rod includes 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 connecting plates (1801), and the other end is connected to the other connecting plate (1801); there are a plurality of rake teeth (1803), and the plurality of rake teeth (1803) are arranged at intervals in pairs along the axial direction of the connecting rod (1802).

3. The multi-stage threshing device according to claim 2, wherein: The first fine threshing drum (2) includes a vertically arranged mounting disc (201); there are two mounting discs (201), and the two mounting discs (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 rotationally connected to the side wall of the housing (1), and the first rotating shaft (15) is parallel to the second rotating shaft (16); a plurality of threshing and straw discharging tooth rods are installed between the two mounting discs (201), and the threshing and straw discharging tooth rod includes a tooth rod (202), and a threshing knife (203) located in the first threshing conveying section and a threshing and discharging rib (204) located in the first threshing discharging section are arranged on the outer peripheral surface of the tooth rod (202); one end of the tooth rod (202) is connected to one mounting disc (201), and the other end is connected to the other mounting disc (201). A vertically arranged guide plate (106) is connected to the inner wall of the top of the housing (1), and the guide plate (106) is arranged along the spiral direction of the axial direction of the second rotating shaft (16); there are multiple guide plates (106), and the multiple guide plates (106) are arranged at intervals in pairs along the axial direction of the second rotating shaft (16) and are arranged corresponding to the first threshing conveying section.

4. The multi-stage threshing device according to claim 3, wherein: The second fine threshing drum (3) includes a horizontally arranged mounting cylinder (301), and a spiral conveying blade (302) and a threshing rib structure are arranged on the outer peripheral surface of the mounting cylinder (301); the mounting cylinder (301) is rotationally 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; there are multiple groups of threshing rib structures, and the multiple groups of threshing rib structures are arranged at intervals in pairs along the circumferential direction of the mounting cylinder (301); each group of threshing rib structures includes a plurality of threshing ribs (303) arranged at intervals in pairs along the axial direction of the mounting cylinder (301).

5. The multi-stage threshing device according to claim 4, wherein: A horizontal conveying auger (7) is installed in the housing (1) 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 further includes a lifting and conveying auger mechanism (8) installed outside the housing (1); the lifting and conveying auger mechanism (8) includes a lifting and conveying pipeline (801) connected to the housing (1) and a lifting and conveying auger (802) installed in the lifting and conveying pipeline (801); the lower feed port of the lifting and conveying pipeline (801) is arranged corresponding to and communicated with the grain discharge port. It further includes a pneumatic separation mechanism installed outside the housing (1), and the pneumatic separation mechanism includes 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 installed on one side of the housing (1). The top end of the separation cylinder (11) is the air suction port, and the lower end is the grain receiving port (1101); the material dispersion mechanism is installed in the separation cylinder (11) and has an inclined dispersion surface; there is a spacing for the grains to fall between the lower end of the dispersion surface and the inner wall of the separation cylinder (11). The upper 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 air suction pipe (10) is the first connection port, and the other end is the first slag discharge port; the first connection port of the first air suction pipe (10) is connected to the air suction port of the separation cylinder (11), and the first impurity removal fan (9) is installed on the first air suction pipe (10) and is used to provide the air separation 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.

6. The multi-stage threshing device according to claim 5, characterized in that: The material dispersion mechanism includes a dispersion cone (12) with a smaller upper end and a larger lower end. The upper surface of the dispersion cone (12) serves as the dispersion surface; the dispersion cone (12) is installed in the separation cylinder (11) through a bracket.

7. The multi-stage threshing device according to claim 1, wherein: It further includes a second impurity removal fan (13) and a second air suction pipe (14); one end of the second air suction pipe (14) is the second connection port, and the other end is the 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 the air separation pressure. The second impurity removal fan (13) is driven by a driving mechanism.

8. The multi-stage threshing device according to claim 3, wherein: It further includes a first scraper (205) connected to the threshing and discharging rib (204). The length direction of the first scraper (205) is parallel to the length direction of the cutter bar (202); one end in the width direction of the first scraper (205) is close to the rotation center of the first fine threshing drum (2), and the other end in the width direction of the first scraper (205) is far from the rotation center of the first fine threshing drum (2) and has a gap with the first screen (4).

9. The multi-stage threshing device according to claim 4, characterized in that: It further 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 installation cylinder (301). One end in the width direction of the second scraper (304) is adjacent to the outer peripheral surface of the installation cylinder (301), and the other end in the width direction of the second scraper (304) is far from the outer peripheral surface of the installation cylinder (301) and has a gap with the second screen (5).

10. The multi-stage threshing device according to claim 5, characterized in that: The housing (1) includes a lower housing (103) with an upward opening. The partition member (6) is installed on the lower housing (103) and divides the upper opening of the lower housing (103) into a first opening and a second opening. It further 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 partition member (6), and the other end is detachably connected to the upper end of one of the side walls of the lower housing (103) through 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 housing (103), and the other end is detachably connected to the partition member (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 housing (103), and the second rotating shaft (16) and the third rotating shaft (19) are both rotatably connected to the side wall of the lower housing (103); The feed inlet, the slag discharge port (102) and the grain discharge port are opened on the lower housing (103); The feed hopper (101) and the lifting and conveying pipeline (801) are both welded to the lower housing (103).

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