A large-feed threshing drum with concave plate gap adjustment function

Abstract

The invention discloses a large-feed threshing drum with a concave plate gap adjustment function. In order to overcome the problems that the concave plate gap of the existing threshing drum is difficult to adjust, the adjustment accuracy is insufficient, the guide plate angle cannot be adjusted, and the threshing elements on the threshing drum are difficult to replace, the invention comprises a threshing drum, a concave plate assembly, an upper cover plate assembly and a frame. The rear axle and the front axle of the threshing drum are installed on the frame through the support bearing, the concave plate assembly is installed directly below the threshing drum, and surrounds the threshing drum in a semicircular shape, and the two sides are fixed to the frame in the form of bolt connection. The upper cover plate assembly is installed directly above the threshing drum, and surrounds the threshing drum in a semicircular shape, and the two sides are fixed to the frame in the form of bolt connection, and the concave plate assembly and the upper cover plate assembly are cylindrical and enclose the threshing drum in the middle. The concave plate gap can be electrically adjusted, the threshing elements can be quickly replaced, and the guide plate angle is adjustable, which can meet the crop harvesting needs under various changing conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery threshing drums, and more specifically, relates to a large-feed threshing drum with a concave plate gap adjustment function. Background Art

[0002] Corn threshing is a key link in the mechanization of corn production, which can greatly improve operating efficiency, liberate and develop productivity. However, due to differences in parameters such as corn varieties and moisture content, the optimal parameters of the threshing drum required in the threshing process are also different, and the existing corn threshing drum is still lacking in parameter adjustment. The types of threshing elements on the threshing drum are fixed, and the arrangement method is also difficult to replace. Replacing different types of threshing elements requires replacing the threshing drum as a whole, which is time-consuming and labor-intensive, and lacks economy. The adjustment accuracy of the concave plate gap of the threshing drum cannot be guaranteed, the angle of the guide plate cannot be adjusted, etc., resulting in the existing corn thresher being unable to adapt well to the threshing process of corn with different parameters, resulting in problems such as increased breakage rate and decreased threshing rate. Therefore, it is of great significance to invent a threshing drum that can quantitatively adjust the concave plate gap, adjust the angle of the guide plate, and replace the threshing element. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the prior art has the problems that the concave plate gap cannot be quantitatively adjusted, the guide plate cannot be adjusted, and the threshing element is not easy to replace. A large-feed threshing drum with a concave plate gap adjustment function is provided.

[0004] A large-feed threshing drum with a concave plate gap adjustment function comprises a threshing drum, a concave plate assembly, an upper cover plate assembly and a frame.

[0005] The rear axle and the front axle of the threshing drum are installed on the frame through the support bearings, the concave plate assembly is installed directly below the threshing drum, surrounds the threshing drum in a semicircular shape, and is fixed to the frame on both sides by bolt connection. The upper cover plate assembly is installed directly above the threshing drum, surrounds the threshing drum in a semicircular shape, and is fixed to the frame on both sides by bolt connection. The concave plate assembly and the upper cover plate assembly are cylindrical and enclose the threshing drum.

[0006] The threshing drum comprises a rear axle, a threshing element mounting plate, a threshing drum body, a grain bar block, a threshing element mounting hole, an auger and a front axle;

[0007] The threshing element mounting plate is distributed in a spiral pattern and welded to the rear of the threshing drum body, the threaded rod block is distributed in a spiral pattern and fixed to the middle of the threshing drum body by passing through the threshing element mounting hole, and the auger is welded to the front of the threshing drum body. The front shaft and the rear shaft of the drum pass through the front and rear support bearings on the frame respectively.

[0008] The threshing drum body is formed by bending and welding plates, has a length of 2800-3100 mm, a diameter of 480-520 mm, a working speed of 400-600 r / min, and can withstand a feed amount range of 0.5-15 kg / s.

[0009] The threshing element mounting holes are distributed on the threshing drum body according to the law of equidistant spirals, and the number of the grained rod blocks can be increased or decreased by the number of mounting rows on the threshing element mounting holes, without affecting the overall dynamic balance of the threshing drum.

[0010] The concave plate assembly comprises a concave plate and a concave plate gap adjustment assembly;

[0011] There are three types of concave plates, all of which can be disassembled and replaced. The three concave plate units are low-damage concave plates, horizontal square hole concave plates and vertical square hole concave plates. The bars of the low-damage concave plates are welded to the surface of the reinforcing ribs, and the inner reinforcing ribs have no protruding parts to avoid damage to crop grains.

[0012] The adjustment range of the concave plate gap is 5 to 40 mm, and the adjustment accuracy is 0.5 mm.

[0013] The three low-damage concave plates are arranged in parallel at the rear of the concave plate assembly, and the two edge parts of the upper end are fixed to the two sides of the frame by three bolts respectively. The four low-damage concave plates are arranged in parallel at the front of the concave plate assembly, and the joints between the two are embedded in the arc-shaped support plate. One side of the upper end is connected to the turntable through the arc-shaped support plate with two bolts. The center of the turntable is passed through by a fixed long rod and can rotate around the fixed long rod; the other side of the upper end is connected to the lifting rod through the arc-shaped support plate with a rotatable pin shaft, and moves up and down with the lifting rod. There are bolt holes on the top of each low-damage concave plate.

[0014] The concave plate gap adjustment assembly includes a motor, a worm gear reducer, a bearing seat, a worm gear reducer commutator, a worm shaft, an adjustment long rod, a short pull rod, a lifting rod, an arc support plate, a fixed long rod, a connecting turntable and a positioning turntable.

[0015] The motor is a stepper motor, which is fixed to the frame by 4 bolts. The motor is connected to a worm gear reducer. The worm shaft on the worm gear reducer is fixed to the bearing seat as the output end, and is connected to the adjustment long rod through the worm gear reduction commutator. The adjustment long rod is welded together with three short pull rods. The adjustment long rod cooperates with the positioning turntable and can rotate around the positioning turntable, wherein the positioning turntable is fixed to the frame. The short pull rod is hinged to the lifting rod through a latch. The lifting rod is hinged to the arc support plate through a latch, and the arc support plate is fixed to the connecting turntable through bolts. The connecting turntable cooperates with the fixed long rod, and the connecting turntable can rotate around the fixed long rod, and both ends of the fixed long rod are fixed to the frame.

[0016] The lifting rod comprises an upper lifting block, a double-headed adjusting bolt and a lower lifting block.

[0017] The double-headed adjusting bolt is respectively connected with the upper lifting block and the lower lifting block through threads, and the length of the lifting rod can be adjusted by adjusting the screw-in length of the threads.

[0018] The upper cover plate assembly comprises an upper cover plate, a guide plate angle adjustment assembly and a rear baffle.

[0019] The deflector angle adjustment assembly is installed on the upper cover plate through 7 equidistant circular holes with the same diameter on the top of the upper cover plate. The rear baffle is a semicircular plate, which is fixed to the rear of the upper cover plate by bolts.

[0020] The deflector angle adjustment assembly comprises 7 identical deflectors, a long pad, 7 identical threaded shafts, a long binary shaft, 6 identical short binary shafts, a connecting rod, a short movable shaft and a fixing frame.

[0021] The deflector is a 1 / 4 arc plate, which is installed on the inner side of the upper cover plate, welded on the threaded shaft, and can rotate with the threaded shaft. The 7 threaded shafts pass through the 7 circular holes on the upper cover plate, pass through the long pad plate and are fixed to the deflector. One long binary shaft and six short binary shafts are respectively fixed to the top of the threaded shaft by bolts, and can rotate with the threaded shaft. The long binary shaft is fixed to the front end of the threaded shaft on the upper cover plate, and the six short binary shafts are respectively fixed to the remaining six threaded shafts. The connecting rod is a long rod with a rectangular cross-section, which connects one long binary shaft and six short binary shafts to form a parallelogram mechanism. The connecting rod is placed at the bifurcation of one long binary shaft and six short binary shafts and fixed with bolts. The short movable shaft and the long binary shaft are connected by bolts, and can move back and forth in the fixed sleeve of the fixing frame, thereby changing the angle of the deflector. The fixing frame is fixed to the upper cover plate with bolts.

[0022] The angle adjustment range of the guide plate is 0 to 14 degrees.

[0023] The frame comprises a frame body, a middle frame, a feed hopper and a support bearing.

[0024] The feed hopper is installed at the front end of the frame body, connected with the middle frame, the concave plate assembly and the upper cover plate assembly, and its spatial position is fixed relative to the middle frame and the threshing drum. The support bearings are respectively installed on the front and rear end surfaces of the middle frame to support and fix the rear axle and the front axle of the threshing drum.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The concave plate gap can be electrically adjusted, with an adjustment range of 5 to 40 mm and an adjustment accuracy of 0.5 mm.

[0027] 2. In the threshing drum assembly of the present invention, the angle of the guide plate on the upper cover plate of the threshing drum is adjustable within a range of 0 to 14°.

[0028] 3. The feeding amount has a wide range of variation, and the control range of the feeding amount is 0.5 to 15 kg / s.

[0029] 4. A low-damage concave plate is designed, and the concave plate can be replaced in 3 types.

[0030] 5. The installation holes of threshing elements are arranged in a spiral pattern, making it easy to add, reduce or replace threshing elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the general assembly diagram of the present invention;

[0032] Figure 2 It is the assembly diagram of the threshing drum of the present invention;

[0033] Figure 3 A threshing element replacement method of the present invention;

[0034] Figure 4 It is the overall structural diagram of the concave plate assembly of the present invention;

[0035] Figure 5 There are three types of concave plates of the present invention;

[0036] Figure 6 The concave plate gap adjustment assembly of the present invention;

[0037] Figure 7 A lifting rod assembly of the present invention;

[0038] Figure 8 The upper cover plate assembly of the present invention;

[0039] Fig. 9 The deflector angle adjustment assembly of the present invention;

[0040] Fig.10 The invention relates to a frame assembly.

[0041] In the figure: A, threshing drum; B, concave plate assembly; C, upper cover plate assembly; D, frame; 1, rear axle; 2, threshing element mounting plate; 3, threshing drum body; 4, bar block; 5, threshing element mounting hole; 6, auger; 7, front axle; 8, concave plate; 9, concave plate gap adjustment assembly; 10, low damage concave plate; 11, horizontal square hole concave plate; 12, vertical square hole concave plate; 13, grid bar; 14, reinforcing rib; 15, motor; 16, worm gear reducer; 17, bearing seat; 18, worm gear reducer commutator; 19, worm shaft; 20, adjusting long rod ; 21. Short pull rod; 22. Lifting rod; 23. Arc support plate; 24. Fixed long rod; 25. Connecting turntable; 26. Positioning turntable; 27. Upper lifting block; 28. Double-headed adjusting bolt; 29. ​​Lower lifting block; 30. Upper cover plate; 31. Guide plate angle adjustment assembly; 32. Rear baffle; 33. Guide plate; 34. Long pad; 35. Threaded shaft; 36. Long binary shaft; 37. Short binary shaft; 38. Connecting rod; 39. Short movable shaft; 40. Fixed frame; 41. Frame body; 42. Middle frame; 43. Feed hopper; 44. Support bearing. DETAILED DESCRIPTION

[0042] See also Figure 1 A threshing drum with a large feeding amount and a concave plate gap adjustment function comprises a threshing drum A, a concave plate assembly B, an upper cover plate assembly C and a frame D.

[0043] The rear axle 1 and the front axle 7 of the threshing drum A are installed on the frame D through the support bearing 44, and the concave plate assembly B is installed directly below the threshing drum A, and surrounds the threshing drum A in a semicircular shape, and the two sides are fixed to the frame D in the form of bolt connection. The upper cover plate assembly C is installed directly above the threshing drum A, and surrounds the threshing drum A in a semicircular shape, and the two sides are fixed to the frame D in the form of bolt connection. The concave plate assembly B and the upper cover plate assembly C are cylindrical and enclose the threshing drum A therein.

[0044] See also Figures 2 to 3 The threshing drum A comprises a rear axle 1, a threshing element mounting plate 2, a threshing drum body 3, a threaded rod block 4, a threshing element mounting hole 5, an auger 6 and a front axle 7;

[0045] The threshing element mounting plate 2 is distributed in a spiral pattern and welded to the rear of the threshing drum body 3, the bar block 4 is distributed in a spiral pattern and fixed to the middle of the threshing drum body 3 by four bolts passing through the threshing element mounting hole 5, and the auger 6 is welded to the front of the threshing drum body 3. The drum front shaft 7 and the drum rear shaft 1 pass through the front and rear support bearings 44 on the frame D respectively.

[0046] The threshing drum body 3 is formed by bending and welding plates, has a length of 2800-3100 mm, a diameter of 480-520 mm, a working speed of 400-600 r / min, and can withstand a feed amount range of 0.5-15 kg / s.

[0047] The threshing element mounting holes 5 are distributed on the threshing drum body 3 according to the law of equidistant spirals. The number of the grooved rod blocks 4 can be increased or decreased by the number of mounting rows on the threshing element mounting holes 5, without affecting the overall dynamic balance of the threshing drum A.

[0048] See also Figure 4 , the concave plate assembly B includes a concave plate 8 and a concave plate gap adjustment assembly 9;

[0049] See also Figure 5 The concave plate 8 has three types, all of which can be disassembled and replaced. The three concave plate units are low-damage concave plate 10, horizontal square hole concave plate 11 and vertical square hole concave plate 12. The bars 13 of the low-damage concave plate 10 are welded to the surface of the reinforcing rib 14, and the inner reinforcing rib 14 has no protruding parts to avoid damage to crop grains.

[0050] The clearance adjustment range of the concave plate 8 is 5 to 40 mm, and the adjustment accuracy is 0.5 mm.

[0051] The three low-damage concave plates 10 are arranged in parallel at the rear of the concave plate assembly B, and the two edge parts of the upper end are fixed to the two sides of the frame D by three bolts respectively. The four low-damage concave plates 10 are arranged in parallel at the front of the concave plate assembly B, and the two butt joints are embedded in the arc-shaped support plate 23. One side of the upper end is connected to the turntable 25 through the arc-shaped support plate 23 with two bolts. The center of the turntable 25 is passed through by the fixed long rod 24 and can rotate around the fixed long rod 24; the other side of the upper end is connected to the lifting rod 22 through the circular arc-shaped support plate 23 with a rotatable pin shaft, and moves up and down with the lifting rod 22. There are bolt holes on the top of each low-damage concave plate 10.

[0052] See also Figure 6 The concave plate gap adjustment assembly 9 includes a motor 15, a worm gear reducer 16, a bearing seat 17, a worm gear reduction commutator 18, a worm shaft 19, an adjustment long rod 20, a short pull rod 21, a lifting rod 22, an arc support plate 23, a fixed long rod 24, a connecting turntable 25 and a positioning turntable 26.

[0053] The motor 15 is a stepper motor, which is fixed to the frame D by four bolts. The motor 15 is connected to the worm gear reducer 16. The worm shaft 19 on the worm gear reducer 16 is fixed to the bearing seat 17 as the output end, and is connected to the adjustment long rod 20 through the worm gear reduction commutator 18. The adjustment long rod 20 is welded together with three short pull rods 21. The adjustment long rod 20 cooperates with the positioning turntable 26 and can rotate around the positioning turntable 26, wherein the positioning turntable 26 is fixed to the frame D. The short pull rod 21 is hinged to the lifting rod 22 by a latch. The lifting rod 22 is hinged to the arc support plate 23 by a latch, and the arc support plate 23 is fixed to the connecting turntable 25 by bolts. The connecting turntable 25 cooperates with the fixed long rod 24, and the connecting turntable 25 can rotate around the fixed long rod 24, and the two ends of the fixed long rod 24 are fixed to the frame D.

[0054] See also Figure 7 The lifting rod 22 includes an upper lifting block 27 , a stud adjusting bolt 28 and a lower lifting block 29 .

[0055] The stud adjusting bolt 28 is connected to the upper lifting block 27 and the lower lifting block 29 respectively through threads, and the length of the lifting rod 22 can be adjusted by adjusting the screw-in length of the threads.

[0056] See also Figure 8 The upper cover plate assembly C includes an upper cover plate 30, a guide plate angle adjustment assembly 31 and a rear baffle 32.

[0057] The deflector angle adjustment assembly 31 is installed on the upper cover plate 30 through 7 equidistant circular holes with the same diameter on the top of the upper cover plate 30. The rear baffle 32 is a semicircular plate and is fixed to the rear of the upper cover plate 30 by bolts.

[0058] See also Fig. 9 The deflector angle adjustment assembly 31 includes 7 identical deflectors 33, a long pad 34, 7 identical threaded shafts 35, a long binary shaft 36, 6 identical short binary shafts 37, a connecting rod 38, a short movable shaft 39 and a fixing frame 40.

[0059] The deflector 33 is a 1 / 4 arc plate, which is installed on the inner side of the upper cover plate 30, welded to the threaded shaft 35, and can rotate with the threaded shaft 35. The seven threaded shafts 35 pass through the seven circular holes on the upper cover plate 30, pass through the long pad 34 and are fixed to the deflector 33. One long binary shaft 36 and six short binary shafts 37 are respectively fixed to the top of the threaded shaft 35 by bolts, and can rotate with the threaded shaft 35. The long binary shaft 36 is fixed to the threaded shaft 35 at the front end of the upper cover plate 30, and the six short binary shafts 37 are respectively fixed to the remaining six threaded shafts 35. The connecting rod 38 is a long rod with a rectangular cross section, which connects one long binary shaft 36 and six short binary shafts 37 to form a parallelogram mechanism. The connecting rod 38 is placed at the bifurcation of one long binary shaft 36 and six short binary shafts 37 and is fixed with bolts. The short movable shaft 39 and the long binary shaft 36 are connected by bolts and can move back and forth in the fixed sleeve of the fixed frame 40, thereby changing the angle of the guide plate 33. The fixed frame 40 is fixed on the upper cover plate 30 by bolts.

[0060] The angle adjustment range of the guide plate 33 is 0 to 14 degrees.

[0061] See also Fig.10 The frame D includes a frame body 41, a middle frame 42, a feed hopper 43, and a support bearing 44.

[0062] The feed hopper 43 is installed at the front end of the frame body 41, connected to the middle frame 42, the concave plate assembly B and the upper cover plate assembly C, and its spatial position is fixed relative to the middle frame 42 and the threshing drum A. The support bearings 44 are respectively installed on the front and rear end surfaces of the middle frame 42 to support and fix the rear axle 1 and the front axle 7 of the threshing drum A.

[0063] Working principle of the present invention:

[0064] See also Figure 1 to Figure 2 The working principle of the whole machine of the present invention is as follows. After the rear axle 1 is powered, the threshing drum A rotates, and the corn waiting to be threshed enters the feed hopper 43, and enters the cavity formed by the threshing drum A, the concave plate assembly B and the upper cover plate assembly C under the conveyance of the auger 6. The bar blocks 4 on the threshing drum A thresh the crops, and the threshed grains are screened out by the gaps of the concave plate 8, and the rest are guided by the guide plate 33 and squeezed out from the end of the threshing drum A to complete the threshing operation.

[0065] See also Figure 6 to Figure 7The working principle of the concave plate gap adjustment assembly 9 of the present invention is as follows. When the concave plate gap needs to be adjusted, the power supply of the motor 15 is turned on, and the motor 15 drives the connected worm gear reducer 16 to rotate. The output shaft of the connected worm gear reducer 16 is a worm, which drives the turbine on the adjustment long rod 20 to rotate. The adjustment long rod 20 is welded to the short pull rod 21. The short pull rod 21 rotates under the drive of the adjustment long rod 20, driving the lifting rod 22 to move up and down, so that the arc support plate 23 and the connecting turntable 25 rotate around the fixed long rod 24. Driven by the arc support plate 23, the low-damage concave plate 10 moves up and down, and the relative spatial position with the threshing drum A changes, thereby adjusting the concave plate 8 gap.

[0066] See also Figures 8 to 9 The working principle of the guide plate angle adjustment assembly 31 of the present invention is as follows. The angle of the guide plate 33 determines how fast the corn crop waiting to be threshed can be threshed. The larger the angle of the guide plate 33, the faster the crop can be threshed and the lower the threshing rate; the smaller the angle of the guide plate 33, the slower the crop can be threshed and the higher the threshing rate. The long pad 34 is fixed on the upper cover plate 30 and is the fixing frame of the entire guide plate angle adjustment assembly 31. When the angle of the guide plate 33 needs to be adjusted, the short movable shaft 39 moves axially under the drive of the linear motor, driving the long binary shaft 36 to rotate around the hole on the long pad 34, and then driving the four-bar linkage formed by the short binary shaft 37 and the connecting rod 38 to move as a whole. The guide plate 33 is fixed to the threaded shaft 35. When the threaded shaft 35 rotates, the guide plate 33 also rotates around the hole on the long pad 34, and finally the angle of the guide plate 33 changes.

Claims

1. A large-feed threshing drum with concave plate gap adjustment function, characterized in that: It includes a threshing drum (A), a concave plate assembly (B), an upper cover plate assembly (C) and a frame (D); The rear axle (1) and the front axle (7) of the threshing drum (A) are installed on the frame (D) through the support bearing (44); the concave plate assembly (B) is installed directly below the threshing drum (A) and surrounds the threshing drum (A) in a semicircular shape, and the two sides are fixed to the frame (D) in the form of bolt connection; the upper cover plate assembly (C) is installed directly above the threshing drum (A) and surrounds the threshing drum (A) in a semicircular shape, and the two sides are fixed to the frame (D) in the form of bolt connection; the concave plate assembly (B) and the upper cover plate assembly (C) are cylindrical and surround the threshing drum (A); The threshing drum (A) comprises a rear axle (1), a threshing element mounting plate (2), a threshing drum body (3), a threaded rod block (4), a threshing element mounting hole (5), an auger (6) and a front axle (7); The threshing element mounting plate (2) is distributed in a spiral pattern and welded to the rear of the threshing drum body (3); the threaded rod block (4) is distributed in a spiral pattern and is fixed to the middle of the threshing drum body (3) by passing through the threshing element mounting hole (5) with four bolts; the auger (6) is welded to the front of the threshing drum body (3); the drum front shaft (7) and the drum rear shaft (1) respectively pass through the front and rear support bearings (44) on the frame (D); The threshing drum body (3) is formed by bending and welding plates, has a length of 2800-3100 mm, a diameter of 480-520 mm, a working speed of 400-600 r / min, and a feed rate range of 0.5-15 kg / s; The threshing element mounting holes (5) are distributed on the threshing drum body (3) according to the law of equidistant spirals, and the number of the threaded rod blocks (4) can be increased or decreased by the number of rows of mounting holes (5) on the threshing element mounting holes; The concave plate assembly (B) comprises a concave plate (8) and a concave plate gap adjustment assembly (9); The concave plate (8) has three types, and the three concave plate units are respectively a low-damage concave plate (10), a horizontal square hole concave plate (11) and a vertical square hole concave plate (12); the bars (13) of the low-damage concave plate (10) are welded to the surface of the reinforcing rib (14), and the inner reinforcing rib (14) has no protruding part; The three concave plates (8) are arranged in parallel at the rear of the concave plate assembly (B), and the two edge parts of the upper end are fixed to the two sides of the frame (D) by three bolts respectively; the four concave plates (8) are arranged in parallel at the front of the concave plate assembly (B), and the joints between the two are embedded in the arc-shaped support plate (23), one side of the upper end is connected to the turntable (25) by two bolts through the arc-shaped support plate (23), and the center of the turntable (25) is passed through by a fixed long rod (24); the other side of the upper end is connected to the lifting rod (22) by a rotatable pin shaft through the circular arc-shaped support plate (23), and moves up and down with the lifting rod (22), and each concave plate (8) has a bolt hole on the top; The concave plate gap adjustment assembly (9) comprises a motor (15), a worm gear reducer (16), a bearing seat (17), a worm gear reduction commutator (18), a worm shaft (19), an adjustment long rod (20), a short pull rod (21), a lifting rod (22), an arc-shaped support plate (23), a fixed long rod (24), a connecting turntable (25) and a positioning turntable (26); The motor (15) is a stepper motor, which is fixed to the frame (D) by four bolts. The motor (15) is connected to a worm gear reducer (16). The worm shaft (19) on the worm gear reducer (16) is fixed to the bearing seat (17) as the output end, and is connected to the adjustment long rod (20) through the worm gear reduction commutator (18); the adjustment long rod (20) is welded with three short pull rods (21), the adjustment long rod (20) cooperates with the positioning turntable (26), and the positioning turntable (26) is fixed to the frame (D); the short pull rod (21) and the lifting rod (22) are hinged by a latch; the lifting rod (22) is hinged by a latch and an arc-shaped support plate (23), and the arc-shaped support plate (23) is fixed to the connecting turntable (25) by bolts; the connecting turntable (25) cooperates with the fixed long rod (24), and both ends of the fixed long rod (24) are fixed to the frame (D).

2. A large-feed threshing drum with concave plate gap adjustment function as claimed in claim 1, characterized in that: The lifting rod (22) comprises an upper lifting block (27), a double-headed adjusting bolt (28) and a lower lifting block (29); The double-headed adjusting bolt (28) is connected to the upper lifting block (27) and the lower lifting block (29) respectively through threads, and the length of the lifting rod (22) can be adjusted by adjusting the screw-in length of the threads.

3. A large-feed threshing drum with concave plate gap adjustment function as claimed in claim 1, characterized in that: The clearance adjustment range of the concave plate (8) is 5 to 40 mm, and the adjustment accuracy is 0.5 mm.

4. A large-feed threshing drum with concave plate gap adjustment function as claimed in claim 1, characterized in that: The upper cover plate assembly (C) comprises an upper cover plate (30), a guide plate angle adjustment assembly (31) and a rear baffle (32); The deflector angle adjustment assembly (31) is installed on the upper cover plate (30) through seven equidistant circular holes with the same diameter on the top of the upper cover plate (30); the rear baffle (32) is a semicircular plate and is fixed to the rear of the upper cover plate (30) by bolts; The deflector angle adjustment assembly (31) comprises seven identical deflectors (33), a long pad (34), seven identical threaded shafts (35), a long binary shaft (36), six identical short binary shafts (37), a connecting rod (38), a short movable shaft (39) and a fixing frame (40); The deflector plate (33) is a 1 / 4 arc-shaped plate, which is installed on the inner side of the upper cover plate (30) and welded to the threaded shaft (35); the seven threaded shafts (35) respectively pass through the seven circular holes on the upper cover plate (30), pass through the long pad (34) and are fixed to the deflector plate (33); one long binary shaft (36) and six short binary shafts (37) are respectively fixed to the top of the threaded shaft (35) by bolts; the long binary shaft (36) is fixed to the threaded shaft (35) at the front end of the upper cover plate (30), and the six short binary shafts (37) are respectively fixed to the top of the threaded shaft (35) by bolts. The short binary shafts (37) are respectively fixed on the remaining six threaded shafts (35); the connecting rod (38) is a long rod with a rectangular cross-section, connecting one long binary shaft (36) and six short binary shafts (37) to form a parallelogram mechanism, and the connecting rod (38) is placed at the bifurcation of one long binary shaft (36) and six short binary shafts (37) and fixed with bolts; the short movable shaft (39) and the long binary shaft (36) are connected with bolts, and the fixing frame (40) is fixed on the upper cover plate (30) with bolts.

5. A large-feed threshing drum with concave plate gap adjustment function as claimed in claim 4, characterized in that: The angle adjustment range of the guide plate (33) is 0 to 14 degrees.

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