Air suction type double-row seeder

Abstract

The utility model discloses an air suction type double-row seeding machine which comprises a beam frame and a deflection rack, a plurality of hinge frames are arranged on the beam frame, a deflection rack is rotationally matched on the hinge frames by utilizing a deflection shaft, two rows of negative-pressure seed sowing devices are fixed on the deflection rack, gearboxes with metal box body structures are fixed on two sides of the beam frame, an inclined downward wheel frame is mounted on each gearbox, and a traveling wheel is rotationally matched at the bottom of each wheel frame by utilizing a shaft rod; the side, close to the walking wheels, of the deflection rack is rotationally matched with a grounding roller of a hollow barrel structure through a barrel frame, the side, away from the grounding roller, of the beam frame is provided with an installation frame used for being hung on a walking machine, a negative pressure machine is fixed to the installation frame, and the negative pressure machine provides negative pressure suction force for each set of negative pressure seed sowing devices; the walking wheels provide rotation power for all the negative pressure seed-metering devices through a transmission mechanism; the device has the beneficial effect that the seeding continuity and the seed source stability are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of seed drills, and particularly relates to an air-suction double-row seed drill. Background Art

[0002] Seeder is a planting machine that sows crop seeds. It is a seeding machine used for a certain type or crop.

[0003] Most existing seeders rely on a seeding device (such as a seeder with publication number CN112106489A) for sowing operations. However, when the seeds sown are light seeds, such as wheat seeds and cucumber seeds, these seeds are easily stuck or accumulated on the seed transporting pipe due to their light weight when they are only sown by the seeding device, affecting the seed source stability of the seeding device, resulting in discontinuous seeds discharged by the seeding device, affecting subsequent planting production. Utility Model Content

[0004] The purpose of the utility model is to provide an air suction double-row seeder to solve the problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A pneumatic double-row seeder comprises: a beam frame and a deflection frame; the beam frame is provided with a plurality of hinge frames, the hinge frames are rotatably matched with the deflection frames by means of a deflection shaft, two rows of negative pressure seeding devices are fixed on the deflection frames, gearboxes with a metal box structure are fixed on both sides of the beam frame, a wheel frame inclined downward is installed on the gearbox, and a traveling wheel is rotatably matched with the bottom of the wheel frame by means of an axle rod; a grounding drum with a hollow cylinder structure is rotatably matched with the side of the deflection frame close to the traveling wheel by means of a drum frame, a mounting frame for mounting on a traveling machine is provided on the side of the beam frame away from the grounding drum, a negative pressure machine is fixed on the mounting frame, the negative pressure machine provides negative pressure suction for each group of negative pressure seeding devices, and the traveling wheel provides rotational power for all the negative pressure seeding devices through a transmission mechanism.

[0007] Furthermore, in order to evenly deliver negative pressure to each group of negative pressure seeding devices, the negative pressure machine includes: a fan, an array air duct, and a driven pulley; wherein the fan is fixed to the middle of the mounting frame by a bracket, and the air outlet of the fan is connected to multiple groups of array-distributed pipes to form an array air duct; the number of pipe openings of each group of array air ducts is consistent with the number of all negative pressure seeding devices, and the pipe openings of the array air ducts are connected to the negative pressure pipes of each group of negative pressure seeding devices through pipes, and a driven pulley is concentrically fixed on the rotating shaft of the fan.

[0008] Furthermore, in order to directly obtain rotational power from the walking machine, the mounting frame adopts a bracket that is rotatably matched with a rotating main shaft, a driving wheel is coaxially fixed on the rotating main shaft, and the driving wheel and the driven pulley are connected by a belt drive.

[0009] Furthermore, the transmission mechanism includes: a walking sprocket, a first transmission sprocket, a gearbox, a transmission shaft, a second transmission sprocket, a third transmission sprocket, a drive shaft, a drive sprocket, and an axis transmission sprocket; the walking sprocket is a sprocket installed on the walking wheel axle, the first transmission sprocket is rotatably matched on the gearbox, the walking sprocket and the first transmission sprocket are meshed through chain transmission, the gearbox is rotatably matched with a transmission shaft parallel to the walking wheel axle, the transmission shaft and the first transmission sprocket are transmitted inside the gearbox through sprockets and chains, and the deflection frame is adopted Two sets of parallel driving shafts are rotatably matched with bearings, a set of shaft transmission sprockets are respectively fixed on the same side of the two sets of driving shafts, and the two sets of shaft transmission sprockets are driven by chains; a driving sprocket is fixed on the driving shaft, a seeding sprocket is fixed on the rotating shaft of each set of negative pressure seeding devices, each set of seeding sprockets and the adjacent driving shaft are connected by driving sprockets and chain transmission, a second transmission sprocket is fixed on the transmission shaft, and a third transmission sprocket is provided on the driving shaft adjacent to the second transmission sprocket, and the third transmission sprocket and the second transmission sprocket are driven by chains.

[0010] Furthermore, in order to adjust the seeding height of the negative pressure seeding device, the deflection frame is connected to the drum frame through two groups of height adjustment mechanisms. The drum frame is a plate-like structure and is divided into two groups. Each group of drum frames is connected to the height adjustment mechanism on the same side. The main body of the height adjustment mechanism is a sliding outer sleeve and an inner sleeve, wherein the outer sleeve is connected and fixed to the drum frame on the same side, and the inner sleeve is fixed on the deflection frame; the height adjustment mechanism also includes: a height adjustment screw, a bearing, a fixed plate, a threaded sleeve, and a height adjustment crank; a fixed plate with a sheet-like structure is fixed on the top of the outer sleeve, and a height adjustment screw is rotatably fitted at the center of the fixed plate through a bearing, a threaded sleeve with a block-like structure is fixed on the top of the inner sleeve, and the height adjustment screw and the threaded sleeve are threadedly fitted, and the top of the height adjustment screw protrudes above the fixed plate and is connected to a height adjustment crank with a rocker arm structure.

[0011] Furthermore, in order to allow the traveling wheels to always run close to the ground and ensure that the relative height between the negative pressure seed metering device and the ground is within a reasonable range when the road surface is uneven, a transverse beam with a crossbar structure is fixed on the hinge frame, and the bottom of the transverse beam is connected to the deflection frame through an elastic holding component. The main body of the elastic holding component is a support spring with an elongated elastic force tendency. The bottom of the support spring is connected and fixed to one side of the deflection frame close to the ground roller, and the upper end of the support spring is directly or indirectly fixed under the transverse beam.

[0012] Furthermore, in order to adjust the force with which the walking wheel presses the ground, the elastic pressing component also includes: a spring seat, a force adjusting screw, a rotating column, and a force adjusting crank; a spring seat is fixed on the support spring, and a rotating column is rotatably matched with the transverse beam above the support spring, and the rotating column is provided with a force adjusting crank; a force adjusting screw is concentrically fixed below the rotating column, and the force adjusting screw and the spring seat are matched through threads.

[0013] Furthermore, in order to ensure that the negative pressure seed metering device has sufficient seed sources when working, at least one group of seed bins of a bin box structure is fixed on the beam frame, and the seed inlet of the negative pressure seed metering device is connected with the seed bin by a seed pipe.

[0014] In summary, the utility model has the following beneficial effects:

[0015] The continuity of seeding and the stability of seed sources are guaranteed: through the establishment of a negative pressure machine, when the sown seeds are light seeds such as wheat, the seed discharge may be uneven and discontinuous relying solely on gravity, so at this time the power shaft of the walking machine drives the rotating main shaft to rotate, the rotating main shaft drives the driving wheel to rotate, the driving wheel drives the driven pulley to rotate through the belt, the driven pulley drives the fan to start working, and negative pressure begins to be generated. The negative pressure is transmitted to each group of negative pressure seeders through the pipe mouth of the array air duct, and the negative pressure seeder begins to suck the seeds in the seed bin into the negative pressure seeder through the seed tube, and the negative pressure seeder then performs seeding operations on these seeds; the seed source stability and sustainability of seed discharge are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the rear structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the front structure of the utility model;

[0018] Figure 3 yes Figure 2 A magnified view of the structure in the middle;

[0019] Figure 4 It is a schematic diagram of the transmission structure in the utility model;

[0020] Figure 5 It is a structural schematic diagram of the elastic holding component and the height adjustment mechanism in the utility model;

[0021] Figure 6 It is a schematic diagram of the internal structure of the height adjustment mechanism in the utility model;

[0022] In the figure, 1, beam frame; 2, deflection frame; 3, transmission mechanism; 4, negative pressure machine; 5, height adjustment mechanism; 6, elastic pressure holding assembly; 7, negative pressure seed metering device; 8, seed bin; 9, ground roller; 10, walking wheel; 11, hinge frame; 12, deflection axis; 13, horizontal beam; 14, seed tube; 15, mounting frame; 16, driving wheel; 17, rotating main shaft; 18, wheel frame, 31, walking sprocket; 32, first transmission sprocket; 33, gearbox; 34, transmission shaft; 35, The second transmission sprocket; 36, the third transmission sprocket; 37, the drive shaft; 38, the drive sprocket; 39, the shaft transmission sprocket; 41, the fan; 42, the array air duct; 43, the driven pulley; 51, the height adjustment screw; 52, the bearing; 53, the fixing plate; 54, the threaded sleeve; 55, the height adjustment crank; 56, the outer sleeve; 57, the inner sleeve; 61, the support spring; 62, the spring seat; 63, the force adjustment screw; 64, the rotating column; 65, the force adjustment crank; 71, the seeding sprocket; 91, the drum rack. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] Example:

[0025] See also Figure 1-Figure 6 , the utility model provides a technical solution:

[0026] A pneumatic double-row seeder comprises: a beam frame 1 and a deflection frame 2; the beam frame 1 is provided with a plurality of hinge frames 11, the hinge frames 11 are rotatably matched with the deflection frame 2 by means of a deflection shaft 12, two rows of negative pressure seeding devices 7 are fixed on the deflection frame 2, gearboxes 33 of a metal box structure are fixed on both sides of the beam frame 1, a wheel frame 18 tilted downward is installed on the gearbox 33, and a traveling wheel 10 is rotatably matched with the bottom of the wheel frame 18 by means of an axle rod; a grounding drum 9 of a hollow cylinder structure is rotatably matched with the side of the deflection frame 2 close to the traveling wheel 10 by means of a drum frame 91, a mounting frame 15 for mounting on a traveling machine is provided on the side of the beam frame 1 away from the grounding drum 9, a negative pressure machine 4 is fixed on the mounting frame 15, the negative pressure machine 4 provides negative pressure suction for each group of negative pressure seeding devices 7, and the traveling wheel 10 provides rotational power for all the negative pressure seeding devices 7 through a transmission mechanism 3.

[0027] In order to evenly deliver negative pressure to each group of negative pressure seeding devices 7, the negative pressure machine 4 includes: a fan 41, an array air duct 42, and a driven pulley 43; wherein the fan 41 is fixed to the middle of the mounting frame 15 by a bracket, and the air outlet of the fan 41 is connected to multiple groups of array-distributed pipes to form an array air duct 42; the number of pipe openings of each group of array air ducts 42 is consistent with the number of all negative pressure seeding devices 7, and the pipe openings of the array air duct 42 are connected to the negative pressure pipe of each group of negative pressure seeding devices 7 through a pipe, and a driven pulley 43 is concentrically fixed on the rotating shaft of the fan 41.

[0028] In order to directly obtain the rotational power from the walking machine, the mounting frame 15 is provided with a rotating main shaft 17 by a bracket rotationally matched, a driving wheel 16 is coaxially fixed on the rotating main shaft 17, and the driving wheel 16 and the driven pulley 43 are connected by a belt drive.

[0029] The transmission mechanism 3 includes: a walking sprocket 31, a first transmission sprocket 32, a gearbox 33, a transmission shaft 34, a second transmission sprocket 35, a third transmission sprocket 36, a drive shaft 37, a drive sprocket 38, and an axis transmission sprocket 39; the walking sprocket 31 is a sprocket installed on the axle of the walking wheel 10, the first transmission sprocket 32 ​​is rotatably matched on the gearbox 33, the walking sprocket 31 and the first transmission sprocket 32 ​​are meshed through chain transmission, and the gearbox 33 is rotatably matched with a transmission shaft 34 parallel to the axle of the walking wheel 10, the transmission shaft 34 and the first transmission sprocket 32 ​​are driven inside the gearbox 33 through sprockets and chains, and the deflection frame 2 Two sets of parallel drive shafts 37 are rotatably matched with bearings, and a set of shaft transmission sprockets 39 are fixed on the same side of the two sets of drive shafts 37, and the two sets of shaft transmission sprockets 39 are driven by chains; a drive sprocket 38 is fixed on the drive shaft 37, and a seeding sprocket 71 is fixed on the rotating shaft of each set of negative pressure seeding devices 7, and each set of seeding sprockets 71 is connected to the adjacent drive shaft 37 by a drive sprocket 38 and a chain transmission, a second transmission sprocket 35 is fixed on the transmission shaft 34, and a third transmission sprocket 36 is provided on the drive shaft 37 adjacent to the second transmission sprocket 35, and the third transmission sprocket 36 and the second transmission sprocket 35 are driven by chains.

[0030] In order to adjust the seeding height of the negative pressure seeding device 7, the deflection frame 2 is connected to the drum frame 91 through two groups of height adjustment mechanisms 5. The drum frame 91 is a plate-like structure and is divided into two groups. Each group of drum frames 91 is connected to the height adjustment mechanism 5 on the same side. The main body of the height adjustment mechanism 5 is an outer sleeve 56 and an inner sleeve 57 that are slidably matched, wherein the outer sleeve 56 is connected and fixed to the drum frame 91 on the same side, and the inner sleeve 57 is fixed on the deflection frame 2; the height adjustment mechanism 5 also includes: a height adjustment screw 51, a bearing 52, a fixed plate 53, a threaded sleeve 54, and a height adjustment crank 55; a fixed plate 53 with a sheet-like structure is fixed on the top of the outer sleeve 56, and a height adjustment screw 51 is rotatably matched at the center of the fixed plate 53 through the bearing 52, and a threaded sleeve 54 with a block-like structure is fixed on the top of the inner sleeve 57, and the height adjustment screw 51 and the threaded sleeve 54 are threadedly matched, and the top of the height adjustment screw 51 protrudes above the fixed plate 53 and is connected to a height adjustment crank 55 with a rocker arm structure.

[0031] In order to allow the traveling wheel 10 to always run close to the ground and ensure that the relative height between the negative pressure seed metering device 7 and the ground is within a reasonable range when the road surface is uneven, a transverse beam 13 with a crossbar structure is fixed to the hinge frame 11, and the bottom of the transverse beam 13 is connected to the deflection frame 2 through an elastic holding component 6. The main body of the elastic holding component 6 is a support spring 61 with an elongated elastic force tendency. The bottom of the support spring 61 is connected and fixed to the side of the deflection frame 2 close to the grounding roller 9, and the upper end of the support spring 61 is directly or indirectly fixed below the transverse beam 13.

[0032] In order to adjust the force with which the walking wheel 10 presses the ground, the elastic pressing component 6 also includes: a spring seat 62, a force adjusting screw 63, a rotating column 64, and a force adjusting crank 65; a spring seat 62 is fixed on the support spring 61, and a rotating column 64 is rotatably engaged with the transverse beam 13 above the support spring 61, and a force adjusting crank 65 is provided on the rotating column 64; a force adjusting screw 63 is concentrically fixed below the rotating column 64, and the force adjusting screw 63 and the spring seat 62 are engaged through threads.

[0033] In order to ensure that the negative pressure seed metering device 7 has sufficient seed sources when working, at least one group of seed bins 8 of a bin box structure is fixed on the beam frame 1, and the seed inlet of the negative pressure seed metering device 7 is connected to the seed bin 8 through a seed pipe 14.

[0034] Brief description of the usage process:

[0035] When in use, the utility model is fixed as a whole on a walking machine (generally an agricultural tractor or a seeding vehicle) using a mounting frame 15, the rotating main shaft 17 is connected to the power shaft of the walking machine, the grounding roller 9 and the walking wheel 10 are placed on the ground, the seed bin 8 is filled with seeds, and the seed bin 8 supplies seeds to all negative pressure seeding devices 7 through the seed tube 14.

[0036] The walking machinery drives the utility model to move as a whole, the walking wheel 10 is driven to rotate, the walking sprocket 31 on the walking wheel 10 rotates, the walking sprocket 31 drives the first transmission sprocket 32 ​​to rotate through the chain, the first transmission sprocket 32 ​​drives the transmission shaft 34 to rotate through the sprocket in the gearbox 33, the transmission shaft 34 drives the third transmission sprocket 36 and its matching drive shaft 37 to rotate through the second transmission sprocket 35 thereon, the two sets of drive shafts 37 rotate synchronously through the shaft transmission sprocket 39 and the chain transmission, the drive shaft 37 drives all the matching seeding sprockets 71 to rotate through the drive sprocket 38, and the seeding sprocket 71 drives the negative pressure seeding device 7 to perform seeding operations.

[0037] When the sown seeds are light seeds such as wheat, the seed discharge may be uneven and discontinuous if relying solely on gravity. Therefore, at this time, the power shaft of the walking machine drives the rotating main shaft 17 to rotate, and the rotating main shaft 17 drives the driving wheel 16 to rotate. The driving wheel 16 drives the driven pulley 43 to rotate through the belt, and the driven pulley 43 drives the fan 41 to start working and generate negative pressure. The negative pressure is transmitted to each group of negative pressure seeding devices 7 through the pipe mouth of the array air duct 42. The negative pressure seeding device 7 starts to suck the seeds in the seed bin 8 into the negative pressure seeding device 7 through the seed tube 14, and the negative pressure seeding device 7 then performs seeding operations on these seeds; the seed source stability and continuity of seed discharge are guaranteed (the negative pressure seeding device 7 is a direct application of the utility model and is not within the protection scope of this application, so its specific structure is omitted, and its model can be referred to CN104285560A).

[0038] When it is necessary to adjust the working height of the negative pressure seed metering device 7 according to actual conditions, the height adjustment crank 55 can be rotated, and the height adjustment crank 55 drives the height adjustment screw 51 to rotate. Because the threaded sleeve 54 and the inner sleeve 57 are fixedly connected, and the threaded sleeve 54 and the height adjustment screw 51 are threadedly connected, the rotating height adjustment screw 51 will drive the outer sleeve 56 to rise or fall, thereby adjusting the height of the outer sleeve 56, and then adjusting the height of the grounding roller 9 installed on the outer sleeve 56 through the drum frame 91, and then adjusting the working height of the negative pressure seed metering device 7 when the grounding roller 9 is in contact with the ground.

[0039] Because the side of the deflection frame 2 close to the walking wheel 10 is connected to the transverse beam 13 through the support spring 61, and the support spring 61 has an elastic tendency to stretch, and because the transverse beam 13 is fixed to the beam frame 1 by the hinge 11, the support spring 61 will press down the deflection frame 2 under the elastic force of the support spring 61, so that the grounding roller 9 under the deflection frame 2 is always pressed on the ground, ensuring that when the road surface is uneven, the relative height between the negative pressure seed metering device 7 and the ground is within a reasonable range.

[0040] The force with which the ground roller 9 presses the ground can be adjusted to avoid excessive elastic force compacting the soil, and to prevent too little elastic force from failing to provide continuous pressure to the ground roller 9, causing the ground roller 9 to jump up when encountering a pothole, affecting the working height of the negative pressure seed metering device 7; when adjusting the force with which the ground roller 9 presses the ground, the force adjusting crank 65 is rotated to drive the rotating column 64 to rotate, and the force adjusting screw 63 fixed under the rotating column 64 rotates accordingly. Because the spring seat 62 and the force adjusting screw 63 are threadedly connected, the rotating force adjusting screw 63 will drive the spring seat 62 to rise or fall and thereby adjust the stretching length of the support spring 61 connected to the spring seat 62, thereby adaptively adjusting the elastic force of the support spring 61, and combining the above principle to adaptively adjust the force with which the walking wheel 10 presses the ground.

[0041] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An air suction double-row seeder, comprising: A beam frame (1) and a deflection frame (2); characterized in that: the beam frame (1) is provided with a plurality of hinge frames (11), the hinge frames (11) are rotatably matched with the deflection frame (2) by means of a deflection shaft (12), two rows of negative pressure seeding devices (7) are fixed on the deflection frame (2), a gearbox (33) of a metal box structure is fixed on both sides of the beam frame (1), a wheel frame (18) tilted downward is installed on the gearbox (33), and the bottom of the wheel frame (18) is rotatably matched with a walking wheel (10 ); a hollow cylinder structure grounding roller (9) is rotatably matched with a drum frame (91) on one side of the deflection frame (2) close to the walking wheel (10); a mounting frame (15) for mounting on the walking machine is provided on the side of the beam frame (1) away from the grounding roller (9); a negative pressure machine (4) is fixed on the mounting frame (15); the negative pressure machine (4) provides negative pressure suction force for each group of negative pressure seeding devices (7); and the walking wheel (10) provides rotational power for all negative pressure seeding devices (7) through a transmission mechanism (3).

2. The air suction double-row seeder according to claim 1, characterized in that: The negative pressure machine (4) comprises: a fan (41), an array air duct (42), and a driven pulley (43); wherein the fan (41) is fixed to the middle of the mounting frame (15) by a bracket, and the air outlet of the fan (41) is connected to a plurality of array-distributed pipes to form an array air duct (42); the number of pipe openings of each array air duct (42) is consistent with the number of all negative pressure seeding devices (7), and the pipe openings of the array air duct (42) are connected to the negative pressure pipe of each group of negative pressure seeding devices (7) through a pipe, and a driven pulley (43) is coaxially fixed on the rotating shaft of the fan (41).

3. The air suction double-row seeder according to claim 2, characterized in that: The mounting frame (15) is rotatably matched with a rotating main shaft (17), a driving wheel (16) is coaxially fixed on the rotating main shaft (17), and the driving wheel (16) and the driven pulley (43) are connected through a belt transmission.

4. The air suction double-row seeder according to claim 1, characterized in that: The transmission mechanism (3) comprises: a travel sprocket (31), a first transmission sprocket (32), a gearbox (33), a transmission shaft (34), a second transmission sprocket (35), a third transmission sprocket (36), a drive shaft (37), a drive sprocket (38), and a shaft transmission sprocket (39); the travel sprocket (31) is a sprocket installed on the axle of the travel wheel (10); the first transmission sprocket (32) is rotatably engaged with the gearbox (33); the travel sprocket (31) and the first transmission sprocket (32) are meshed through chain transmission; a transmission shaft (34) parallel to the axle of the travel wheel (10) is rotatably engaged with the gearbox (33); the transmission shaft (34) and the first transmission sprocket (32) are transmitted through sprockets and chains inside the gearbox (33); and the deflection The frame (2) is provided with two sets of parallel driving shafts (37) which are rotatably matched with bearings. A set of shaft transmission sprockets (39) are respectively fixed on the same side of the two sets of driving shafts (37). The two sets of shaft transmission sprockets (39) are connected by chains. A driving sprocket (38) is fixed on the driving shaft (37). A seeding sprocket (71) is fixed on the rotating shaft of each set of negative pressure seeding devices (7). Each set of seeding sprockets (71) is connected to the adjacent driving shaft (37) by a driving sprocket (38) and a chain transmission. A second transmission sprocket (35) is fixed on the transmission shaft (34). A third transmission sprocket (36) is provided on the driving shaft (37) adjacent to the second transmission sprocket (35). The third transmission sprocket (36) and the second transmission sprocket (35) are connected by chains.

5. The air suction double-row seeder according to claim 1, characterized in that: The deflection frame (2) is connected to the cartridge frame (91) via two groups of height adjustment mechanisms (5). The cartridge frame (91) is a plate-shaped structure and is divided into two groups. Each group of cartridge frames (91) is connected to the height adjustment mechanism (5) on the same side thereof. The main body of the height adjustment mechanism (5) is an outer sleeve (56) and an inner sleeve (57) that are slidably matched. The outer sleeve (56) is connected and fixed to the cartridge frame (91) on the same side, and the inner sleeve (57) is fixed to the deflection frame (2). The height adjustment mechanism (5) also includes: a height adjustment screw rod (51), a shaft A bearing (52), a fixing plate (53), a threaded sleeve (54), and a height adjustment crank (55); a fixing plate (53) with a sheet-like structure is fixed on the top of the outer sleeve (56); a height adjustment screw (51) is rotatably matched with the center of the fixing plate (53) through the bearing (52); a threaded sleeve (54) with a block-like structure is fixed on the top of the inner sleeve (57); the height adjustment screw (51) and the threaded sleeve (54) are threadably matched; the top of the height adjustment screw (51) protrudes above the fixing plate (53) and is connected to a height adjustment crank (55) with a rocker arm structure.

6. The air suction double-row seeder according to claim 1, characterized in that: A transverse beam (13) of a crossbar structure is fixed on the hinge frame (11), and the bottom of the transverse beam (13) is connected to the deflection frame (2) through an elastic holding component (6), and the main body of the elastic holding component (6) is a support spring (61) with an elongated elastic tendency, and the bottom of the support spring (61) is connected and fixed to a side of the deflection frame (2) close to the grounding roller (9), and the upper end of the support spring (61) is directly or indirectly fixed to the bottom of the transverse beam (13).

7. The air suction double-row seeder according to claim 6, characterized in that: The elastic holding assembly (6) further comprises: a spring seat (62), a force adjusting screw rod (63), a rotating column (64), and a force adjusting crank handle (65); a spring seat (62) is fixed on the support spring (61); a rotating column (64) is rotatably matched with the transverse beam (13) above the support spring (61); and a force adjusting crank handle (65) is provided on the rotating column (64); a force adjusting screw rod (63) is coaxially fixed below the rotating column (64); and the force adjusting screw rod (63) and the spring seat (62) are matched with each other through threads.

8. The air suction double-row seeder according to claim 1, characterized in that: At least one group of seed bins (8) of a bin box structure is fixed on the beam frame (1), and the seed inlet of the negative pressure seed metering device (7) is connected to the seed bin (8) through a seed pipe (14).

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