Hydraulic flail knife corn header

Abstract

A hydraulic flail knife corn header comprises a header rack, two gap bridge shafts are symmetrically arranged at the two ends of the rear side of the header rack, and a plurality of ear picking units and a feeding auger are installed on the header rack side by side. The outer ends of the two gap bridge shafts are in transmission connection with input shafts of the ear picking units respectively, and the input shaft of the ear picking unit located at one end is in transmission connection with one end of the feeding auger. The device is characterized in that a hydraulic motor is mounted in the middle of a right ear picking support of each ear picking unit, and lower flail knives are mounted at the lower ends of the hydraulic motors respectively; a transfer case is mounted in the middle of each gap bridge shaft, a hydraulic pump is in transmission connection with each gap bridge shaft through the corresponding transfer case, the hydraulic pumps are variable load-sensitive pumps and are connected with the corresponding hydraulic motors through load-sensitive valves, and feedback oil ports of the load-sensitive valves are communicated with control ports of the hydraulic pumps. The header can meet the high-speed rotation of the lower flail knife, is compact in structure, reduces the cost, can save the installation space, and facilitates the reasonable layout of a narrow space.

Description

Technical Field

[0001] The utility model relates to a corn cutting platform, in particular to a hydraulic knife-flaying corn cutting platform. Background Art

[0002] Existing corn harvesters typically feature a lower flinger installed below the stalk puller, typically driven by a gearbox consisting of multiple gears. This function shreds the corn stalks as they are pulled, and also cuts the corn stubble. Corn harvesters with lower flingers are popular with growers for their ability to effectively shred corn stalks and return them to the field after harvest, ensuring a clean, even harvest of the corn stubble.

[0003] However, during the corn harvesting process, the existing corn header with a lower fling knife has the following problems:

[0004] 1. Due to uneven terrain or improper operation by the operator, the lower blade can easily strike gravel or frozen soil, causing damage to the blade and transmission gears. 2. The high rotational speed of the blade requires a complex multi-stage gear transmission system that requires more installation space. 3. When the mechanically driven blade is not in use, each gearbox must be disengaged one by one, which is cumbersome. 4. The mechanically driven blade is heavy, resulting in excessive weight for the entire machine. This not only increases fuel consumption but also makes operation difficult for the harvester operator, slows turning speeds, and places high demands on the harvester's bridge load capacity. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a hydraulic knife-flailing corn cutting platform which can save installation space and is easy to operate.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A hydraulic flail corn harvester comprises a harvester frame, two bridge shafts symmetrically provided at both ends of the rear side of the harvester frame, a plurality of ear picking units mounted in parallel on a fixed beam at the front end of the harvester frame, and a feeding auger mounted on the harvester frame behind the ear picking units; the outer ends of the two bridge shafts are respectively connected to the input shafts of the ear picking units located at both ends of the fixed beam, and the input shaft of the ear picking unit located at one end is connected to one end of the feeding auger;

[0008] The invention is characterized in that: a hydraulic motor is respectively installed in the middle of the right ear picking bracket of each ear picking unit, and the lower fling knife of each ear picking unit is respectively installed at the lower end of the hydraulic motor;

[0009] A transfer case is installed at both ends of the rear side of the cutting table frame in the middle of each bridge shaft, and is connected to a hydraulic pump through the transfer case. The hydraulic pump is a variable load-sensitive pump and is connected to the corresponding multiple hydraulic motors through load-sensitive valves and oil pipes. The feedback oil port of the load-sensitive valve is connected to the control port of the hydraulic pump through the feedback oil pipe, which is used to control the displacement of the hydraulic pump, thereby driving the lower swing knife to rotate.

[0010] As a further preference, sealed cavities are provided in the upper and lower beams of the cutting table frame, and are connected to the two hydraulic pumps respectively through oil suction hoses, and are used as the first oil tanks of the two hydraulic pumps to simplify the structural layout and improve space utilization.

[0011] As a further preference, the transfer case includes a case body, in which a first-stage gear transmission mechanism is provided, the driving wheel of the first-stage gear transmission mechanism is larger than the driven wheel, and the driving wheel is installed on the driving shaft through a one-way bearing to realize unidirectional operation of the hydraulic pump.

[0012] As a further preference, the hydraulic motor is a gear hydraulic motor and is fixed to the middle of the right ear picking bracket via a seat plate.

[0013] As a further preference, the load-sensitive valve includes a plurality of multi-way directional valves connected in parallel, and a pressure compensation valve is connected between each multi-way directional valve and the corresponding hydraulic motor. The control end of one end of each pressure compensation valve is respectively connected to the feedback oil port to achieve an even distribution of the hydraulic motor flow so that the rotational speeds of the hydraulic motors do not affect each other.

[0014] As a further preference, two cylindrical second oil tanks are symmetrically provided at both ends of the rear side of the cutting platform frame, and the two second oil tanks are connected to the upper beam and the lower beam of the cutting platform frame in a one-to-one correspondence, so as to increase the volume of the oil tank.

[0015] As a further preference, a two-position manual reversing valve is connected between the control port of the hydraulic pump and the corresponding second oil tank, so that the power of the hydraulic motor can be manually turned off when the knife-flinging operation is not required.

[0016] As a further preference, the ear picking bracket between two adjacent ear picking units is provided with a straw separation cover and a middle protective cover arranged front and back respectively.

[0017] The beneficial effects of the utility model are:

[0018] 1. A hydraulic motor is installed in the middle of the right ear picking bracket of each ear picking unit, and the lower blade of each ear picking unit is installed at the lower end of the hydraulic motor; it can not only meet the high-speed rotation of the lower blade, but also has a compact structure and reduces costs, and can save installation space, which is conducive to the reasonable layout of a small space.

[0019] 2. Since the hydraulic pump adopts a variable load-sensitive pump and is connected to the corresponding multiple hydraulic motors through load-sensitive valves and oil pipes, the feedback oil port of the load-sensitive valve is connected to the control port of the hydraulic pump through the feedback oil pipe. When the hydraulic motors are subjected to different workloads, it can ensure that the speeds of the various motors will not affect each other, thereby not affecting the continuous progress of the harvesting operation; and the operation is simple.

[0020] 3. By adopting a hydraulic motor to drive the lower blade, the complex multi-stage gear transmission system is saved, which can reduce the weight of the whole machine, reduce working fuel consumption, improve operational flexibility, and reduce the bridge load requirements for the harvester. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 yes Figure 1 Right view of .

[0023] Figure 3 yes Figure 1 Bottom view of .

[0024] Figure 4 yes Figure 1 A partial enlarged view of .

[0025] Figure 5 yes Figure 1 AA section rotation diagram.

[0026] Figure 6 It is a structural diagram of a single ear picking unit.

[0027] Figure 7 yes Figure 6 Top view of .

[0028] Figure 8 yes Figure 6 Bottom view of .

[0029] Figure 9 It is a cross-sectional view of the transfer case.

[0030] Figure 10 This is a hydraulic principle diagram of the utility model.

[0031] Figure 11 yes Figure 10 A partial enlarged view of .

[0032] In the figure: cutting table frame 1, upper crossbeam 101, lower crossbeam 102, fixed beam 103, connecting beam 104, side plate 105, feeding auger 2, load sensing valve 3, bearing bracket 4, bridge shaft 5, hydraulic pump 6, transfer case 7, box body 701, driving shaft 702, first-stage gear transmission mechanism 703, one-way bearing 704, second oil tank 8, bridge transmission box 9, universal shaft 10, ear picking transmission box 11, grain separation cover 12, ear picking unit 13, middle guard 14, oil suction hose 15, rubber baffle 16, auger transmission box 17, input shaft 18, seat plate 19, hydraulic motor 20, transmission gear box 21, safety clutch 22, right ear picking bracket 23, lower flinger 24, ear picking plate 25, left ear picking bracket 26, straw chain 27, stem pulling roller 28, manual reversing valve 29, return oil filter 30, main overflow valve 31, multi-way reversing valve 32, pressure compensation valve 33, first overflow valve 34, second overflow valve 35. DETAILED DESCRIPTION

[0033] like Figures 1 to 5 As shown, the utility model relates to a hydraulic knife corn cutting platform, including a cutting platform frame 1, the cutting platform frame 1 includes an upper crossbeam 101 and a lower crossbeam 102 arranged up and down, and a fixed beam 103 located at the front end, the upper crossbeam, the lower crossbeam and the fixed beam are connected to each other by side plates 105 located at both ends and multiple connecting beams 104 located between the two side plates.

[0034] Two bridge shafts 5 are symmetrically installed at both ends of the rear side of the harvesting table frame 1 through two bearing brackets 4 and bearings, and a plurality of ear picking units 13 are installed in parallel on the fixed beam at the front end of the harvesting table frame 1. In this embodiment, 12 ear picking units are taken as an example; a rotatable feeding auger 2 is installed between the two side plates on the harvesting table frame 1 and behind the ear picking unit 13; the outer ends of the two bridge shafts 5 are respectively connected to the outer ends of the input shafts 18 of the ear picking units 13 located at both ends of the fixed beam through the bridge transmission box 9, the universal shaft 10 and the ear picking transmission box 11 connected in sequence, and the outer end of the input shaft 18 of the ear picking unit 13 located at one end is connected to one end of the feeding auger 2 through the auger transmission box 17.

[0035] The bridge transmission case 9 and the ear-picking transmission case 11 are identical in structure, each consisting of a housing and a bevel gear pair housed within it. The auger transmission case 17 also consists of a housing and a two-stage gear transmission mechanism housed within it. Multiple rubber baffles 16 are secured to the header frame 1 below the input shaft 18 of the ear-picking unit 13 via a mounting bracket.

[0036] like Figure 6-8As shown, the ear picking unit 13 includes a transmission gear box 21, which includes a box body, and a two-stage gear transmission mechanism is installed in the box body. The input shaft 18 of the ear picking unit 13 passes through the hollow driving shaft of the two-stage gear transmission mechanism and is connected to the hollow driving shaft through a safety clutch 22. Two pairs of bevel gear pairs are symmetrically provided on the output gear shaft of the two-stage gear transmission mechanism, thereby leading to a pair of opposite-direction plowing chain output shafts on the top surface of the box body, and a pair of opposite-direction stalk pulling roller output shafts on the front of the box body.

[0037] A left ear picking bracket 26 and a right ear picking bracket 23 are symmetrically fixed to the housing of the transmission gear box 21. Two sets of rice-picking chains 27, two ear-picking plates 25 and a pair of stem-pulling rollers 28 are symmetrically mounted on the left ear-picking bracket 26 and the right ear-picking bracket 23, arranged in an upper and lower manner, to form an ear-picking channel; the driving wheels at the rear ends of the two sets of rice-picking chains 27 are respectively mounted on a pair of rice-picking chain output shafts, and the pair of stem-pulling rollers 28 are respectively connected to the output shafts of the pair of stem-pulling rollers through splines;

[0038] A hydraulic motor 20 is mounted in the middle of the right ear-picking bracket 23. A lower flinger 24 is fixedly mounted at the lower end of the hydraulic motor 20, which is used to pull and chop the corn stalks simultaneously. The hydraulic motor 20 is a geared hydraulic motor and is bolted to the middle of the right ear-picking bracket 23 via a base plate 19. The input shaft 18 of each ear-picking unit 13 has a hexagonal cross-section, and the input shafts 18 of adjacent ear-picking units 13 are coaxially connected via a chain coupling. A front-to-back straw separation cover 12 and a center guard 14 are mounted on adjacent ear-picking brackets between two adjacent ear-picking units 13.

[0039] A transfer case 7 is installed at both ends of the rear side of the cutting table frame 1 in the middle of each bridge shaft 5, and is connected to a hydraulic pump 6 through the transfer case 7. The hydraulic pump 6 is a variable load-sensitive pump and is connected to the corresponding multiple hydraulic motors 20 through load-sensitive valves 3 and oil pipes. The feedback oil port LS of the load-sensitive valve 3 is connected to the control port X of the hydraulic pump 6 through the feedback oil pipe, which is used to control the displacement of the hydraulic pump 6, thereby controlling the hydraulic motor 20 to drive the lower blade 24 to rotate.

[0040] like Figure 9 As shown, the transfer case 7 includes a housing 701, which is fixed to the header frame 1 via a bearing bracket 4. A primary gear transmission mechanism 703 is mounted within the housing 701. The primary gear transmission mechanism has a larger driving wheel than the driven wheel, and the driving wheel is mounted on the driving shaft 702 via a one-way bearing 704 to achieve unidirectional operation of the hydraulic pump 6. The bridge shaft 5 has a hexagonal cross-section and passes through the hexagonal center hole of the driving shaft 702 in the transfer case 7 with a clearance fit.

[0041] The upper and lower crossbeams of the header frame 1 each contain sealed cavities, each connected to the oil inlets of the two hydraulic pumps 6 via suction hoses 15. These cavities serve as primary fuel tanks for the two hydraulic pumps 6, streamlining the structural layout and improving space utilization. Two cylindrical secondary fuel tanks 8 are symmetrically bolted to the rear ends of the header frame 1. These secondary fuel tanks 8 are connected to the upper and lower crossbeams 101, 102 of the header frame 1, one-on-one, to increase the tank capacity.

[0042] like Figure 10-11 As shown, the load-sensing valve 3 includes a valve body formed by connecting a plurality of multi-way reversing valves 32 in parallel. The number of the multi-way reversing valves 32 is half of the number of the ear-picking units 13 and is connected to the hydraulic motors 20 through multiple groups of working ports provided on the valve body in a one-to-one correspondence through oil pipes. A pressure compensation valve 33 is connected between each multi-way reversing valve 32 and the corresponding hydraulic motor 20. The control port N at one end of each pressure compensation valve 33 is respectively connected to the feedback oil port LS provided on the valve body to achieve an even distribution of the flow of the hydraulic motors 20, so that the rotational speeds of the various hydraulic motors 20 do not affect each other.

[0043] The multiple groups of working ports are designated A1, B1-A6, and B6. A first relief valve 34 is connected to each working port A1-A6 and the oil return port T1 on the valve body via an internal oil passage. The valve body is also provided with an oil inlet P1 and an oil discharge port Ts. A main relief valve 31 is connected between the oil inlet P1 and the oil return port T1, and a second relief valve 35 is connected between the feedback port LS and the oil discharge port Ts. The first relief valve 34, second relief valve 35, and main relief valve 31 are each mounted within the valve body. The oil return port T1 communicates with the second oil tank 8 via an oil pipe and an oil return filter 30 located above the second oil tank 8.

[0044] The multi-way reversing valve 32 is a three-position, seven-way solenoid reversing valve, whose P port is respectively connected to the oil inlet P1 provided on the valve body, its T port and T' port are connected to each other and to the oil return port T1, its A port and B port are respectively connected to a group of working ports provided on the valve body, its A' port is respectively connected to the P port of the pressure compensation valve 33 and the control port M at one end, and its B' port is connected to the A port of the pressure compensation valve 33.

[0045] When the multi-way reversing valve 32 is in the middle position, its seven interfaces are all cut off; when the multi-way reversing valve 32 is in the upper position, its P port is connected to the A' port, the B port is connected to the T port, the B' port is connected to the A port, and the T' port is cut off; when the multi-way reversing valve 32 is in the lower position, its P port is connected to the A' port, the A port is connected to the T' port, the B' port is connected to the B port, and the T port is cut off.

[0046] The pressure compensating valve 33 is a three-position, three-way hydraulically controlled valve, with port B connected to port N at one end. When the pressure compensating valve 33 is in its initial down position, all three ports are blocked. When in its up position, port P is connected to port A, and port P is connected to port B in a throttled manner. When in its neutral position, port P is connected to port A in a throttled manner, and port B is blocked.

[0047] A two-position two-way manual reversing valve 29 is connected between the control port X of the hydraulic pump 6 and the corresponding second oil tank 8. The manual reversing valve 29 is in a cut-off state in the initial state so that the power of the hydraulic motor 20 can be manually turned off when the knife-flinging operation is not required.

[0048] During operation, the bridge shaft 5 is connected to the power system of the corn harvester through the universal joint at the inner end, and the two bridge shafts 5 are driven to rotate simultaneously by the power system of the corn harvester, and the bridge transmission box 9, the universal joint 10 and the ear picking transmission box 11 at the outer end drive multiple ear picking units 13 to work simultaneously, and the input shaft 18 of the ear picking unit 13 at one end drives the feeding auger 2 to rotate through the auger transmission box 17, and the corn stalks are pulled in, picked and pulled by the grain-pulling chain 27, the ear picking plate 25 and the stem pulling roller 28 of each ear picking unit 13. The corn stalks are sent out through the feeding auger 2 after the ears are picked; at the same time, when the bridge shaft 5 rotates, the hydraulic pump 6 is driven to work through the transfer case 7. After the hydraulic pump 6 works, the pressure oil output by the hydraulic pump 6 drives the hydraulic motor 20 to rotate rapidly through the load sensing valve 3, thereby driving the lower flinger 24 to rotate at high speed, so that the corn stalks can be pulled and chopped at the same time.

[0049] When the lower knife-flinging 24 is not needed to work, the manual reversing valve 29 can be manually controlled to the upper position, so that the feedback oil port LS is directly connected to the second oil tank 8 through the manual reversing valve 29. When the pressure of the feedback oil port LS drops to zero, the displacement of the hydraulic pump 6 will also return to zero, and the hydraulic pump 6 stops outputting, that is, the lower knife-flinging system is turned off.

[0050] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A hydraulic flail corn harvester, comprising a harvester frame, two bridge shafts symmetrically disposed at both ends of the harvester frame's rear side, a plurality of ear picking units mounted in parallel on a fixed beam at the front end of the harvester frame, and a feed auger mounted on the harvester frame behind the ear picking units; the outer ends of the two bridge shafts are respectively drivingly connected to the input shafts of the ear picking units located at both ends of the fixed beam, and the input shaft of the ear picking unit located at one end is drivingly connected to one end of the feed auger; Its characteristics are: A hydraulic motor is respectively installed in the middle of the right ear picking bracket of each ear picking unit, and the lower fling knife of each ear picking unit is respectively installed at the lower end of the hydraulic motor; A transfer case is installed at both ends of the rear side of the cutting table frame in the middle of each bridge shaft, and is connected to a hydraulic pump through the transfer case. The hydraulic pump is a variable load-sensitive pump and is connected to the corresponding multiple hydraulic motors through load-sensitive valves and oil pipes. The feedback oil port of the load-sensitive valve is connected to the control port of the hydraulic pump through the feedback oil pipe, which is used to control the displacement of the hydraulic pump, thereby driving the lower swing knife to rotate.

2. The hydraulic flailing corn harvester according to claim 1, characterized in that: Sealed cavities are provided in the upper crossbeam and the lower crossbeam of the cutting platform frame, and are respectively connected with the two hydraulic pumps through oil suction hoses, and are used as the first oil tanks of the two hydraulic pumps.

3. The hydraulic flailing corn harvester according to claim 1, characterized in that: The transfer case includes a case body, in which a first-stage gear transmission mechanism is arranged. The driving wheel of the first-stage gear transmission mechanism is larger than the driven wheel, and the driving wheel is installed on the driving shaft through a one-way bearing to realize the unidirectional operation of the hydraulic pump.

4. The hydraulic flailing corn harvester according to claim 1, characterized in that: The hydraulic motor is a gear type hydraulic motor and is fixed to the middle of the right ear picking bracket through a seat plate.

5. The hydraulic flailing corn harvester according to claim 1 or 4, characterized in that: The load-sensing valve includes a plurality of multi-way directional valves connected in parallel with each other, and a pressure compensation valve is connected between each multi-way directional valve and the corresponding hydraulic motor. The control end of one end of each pressure compensation valve is respectively connected to the feedback oil port to achieve an even distribution of the hydraulic motor flow.

6. The hydraulic corn cutting platform according to claim 2 is characterized in that: Two cylindrical second oil tanks are symmetrically provided at both ends of the rear side of the cutting platform frame. The two second oil tanks are connected to the upper beam and the lower beam of the cutting platform frame in a one-to-one correspondence to increase the volume of the oil tanks.

7. The hydraulic corn cutting platform according to claim 5 is characterized in that: A two-position manual reversing valve is connected between the control port of the hydraulic pump and the corresponding second oil tank so that the power of the hydraulic motor can be manually turned off when the knife-flinging operation is not required.

8. The hydraulic flailing corn harvester according to claim 1, characterized in that: The ear picking bracket between two adjacent ear picking units is respectively provided with a grain separation cover and a middle protection cover which are arranged front and back.

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