Corn harvester lower cutting knife device and harvester

Abstract

The present invention relates to the technical field of corn harvesters, and in particular to a lower cutting blade device of a corn harvester and a harvester. The lower cutting blade device of a corn harvester comprises: a storage plate, a conveying mechanism and a transmission structure are installed on the storage plate, a mounting cylinder is arranged on the transmission structure, a rotating rod is arranged in the mounting cylinder, the transmission structure can drive the mounting cylinder to rotate, and during the rotation of the mounting cylinder, a cutting structure connected with the rotating rod can cut the straw on the conveying mechanism; a steering mechanism is also arranged in the mounting cylinder, the steering mechanism comprises a lifting assembly and a locking assembly, when the lifting assembly is in motion, the rotating rod can be driven to rotate, the locking assembly comprises a trigger structure and a positioning structure, the positioning structure comprises a locking member coaxially fixed with the rotating rod, when the lifting assembly drives the rotating rod to rotate, the trigger structure cooperates with the locking member, and can lock the position of the rotating rod after half a circle of rotation.

Description

Technical Field

[0001] The invention relates to the technical field of corn harvesters, in particular to a lower cutting knife device of a corn harvester and a harvester. Background Art

[0002] Corn harvester is an agricultural machine that can complete multiple operations such as picking ears, piling, and returning stalks to the field at one time when corn is ripe. It is a new type of agricultural machinery developed for the development of new energy and to reduce the labor intensity of farmers. It is a low-priced agricultural machinery suitable for the popularization of small four-wheeled vehicles in rural areas and can harvest corn stalks. It shortens the labor cycle of farmers and frees them from heavy physical labor.

[0003] The existing corn harvester mainly consists of a cutting device, a conveying device, a hydraulic lifter, etc. During operation, the machine moves forward along the direction of the corn ridge. During the forward process, the cutter can cut and crush the corn stalks, and the conveying device can remove the corn on the stalks. At present, when the harvester is working, in order to ensure that the cutter can cut the stalks normally, the cutter will always rotate in the same direction. In this process, only one set of blades of the cutter is fixed for cutting, and the blade on the other side of the cutter cannot be used, which will cause a waste of resources. At present, when one set of blades of the cutter is worn, the blade conversion operation of the cutter usually requires manual intervention. In order to be able to contact the cutter during operation, the outer shell of the harvesting platform needs to be disassembled first, and the whole replacement process is relatively complicated. Summary of the invention

[0004] The object of the present invention is to provide a corn harvester lower cutter device and a harvester to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A lower cutter device for a corn harvester comprises: a placing plate, a conveying mechanism and a transmission structure are installed on the placing plate, a mounting cylinder is arranged on the transmission structure, a rotating rod is arranged in the mounting cylinder, the transmission structure can drive the mounting cylinder to rotate, and during the rotation of the mounting cylinder, a cutting structure connected to the rotating rod can cut the straw on the conveying mechanism;

[0007] A steering mechanism is also provided in the mounting tube, and the steering mechanism includes a lifting assembly and a locking assembly. When the lifting assembly is in motion, it can drive the rotating rod to rotate. The locking assembly includes a trigger structure and a positioning structure. The positioning structure includes a locking piece coaxially fixed to the rotating rod. In the process of the lifting assembly driving the rotating rod to rotate, the trigger structure cooperates with the locking piece to lock the position of the rotating rod after half a rotation.

[0008] The lower cutter device of the corn harvester as described above: the lifting assembly comprises a moving frame, the moving frame is slidably arranged in the mounting tube, and a ratchet plate is fixedly arranged on the moving frame;

[0009] A ratchet wheel is coaxially fixedly connected to the rotating rod, and the ratchet wheel cooperates with the ratchet strip;

[0010] It also includes a cylinder, which is fixedly arranged in the installation tube, and the telescopic end of the cylinder is fixedly connected to the moving frame. When the cylinder is actuated, it can drive the moving frame to slide along the axial direction of the installation tube.

[0011] The lower cutter device of the corn harvester as described above: the locking member includes a positioning wheel, the positioning wheel is coaxially fixedly connected to the rotating rod, and a positioning groove is opened on the positioning wheel, and two groups of positioning grooves are equidistantly arranged along the circumferential direction of the positioning wheel.

[0012] The lower cutter device of the corn harvester as described above: the positioning structure also includes a fixed sleeve, the fixed sleeve is fixedly arranged in the mounting tube, and a lifting rod is slidably arranged in the fixed sleeve, a pulley is rotatably installed at one end of the lifting rod away from the positioning wheel, and a roller is rotatably installed at the other end of the lifting rod, and the roller is adapted to the positioning groove;

[0013] It also includes a second spring, which is sleeved on the lifting rod and placed in the fixed sleeve, and one end of the second spring abuts against the upper bottom of the fixed sleeve, and the other end abuts against a blocking piece formed on the lifting rod.

[0014] The lower cutter device of the corn harvester as described above: the trigger structure includes a connecting plate, the connecting plate is fixedly connected to the movable frame, and a slide bar is fixedly arranged on the connecting plate, and a slider is fixedly arranged on one end of the slide bar away from the connecting plate;

[0015] It also includes a moving block, which is provided with an insertion groove, the slider is inserted in the insertion groove, and a first spring is slidably arranged on the slide rod, one end of the first spring abuts against the connecting plate, and the other end abuts against the moving block.

[0016] The lower cutting knife device of the corn harvester as described above: the moving block is connected to the guide member fixedly arranged in the mounting tube through a driving member, the driving member includes a longitudinal member fixedly connected to the moving block, a trigger rod is fixedly arranged on the side of the longitudinal member away from the moving block, and the trigger rod cooperates with the guide member to force the moving block to slide along the axial direction of the slide rod.

[0017] The lower cutting blade device of the corn harvester as described above: the guide member includes a guide plate, the guide plate is fixedly arranged in the mounting tube, and an engaging groove is opened on the guide plate, and the trigger rod is slidably arranged in the engaging groove. When the movable frame moves relative to the mounting tube, the engaging groove cooperates with the trigger rod to force the movable block to slide relative to the slide rod.

[0018] The lower cutter device of the corn harvester as described above: the interlocking groove body includes a vertical groove, an inclined groove and a movable groove.

[0019] The lower cutting knife device of the corn harvester as described above: the cutting structure includes a U-shaped connecting piece, cutting knives are fixedly arranged on the left and right sides of the U-shaped connecting piece, and the U-shaped connecting piece is detachably connected to the rotating rod through a clamping piece, and the clamping piece includes a plug-in block fixedly arranged on the inner wall of the U-shaped connecting piece, and the plug-in block is adapted to the adaption groove provided on the rotating rod.

[0020] A corn harvester is also proposed, which comprises the corn harvester lower cutting knife device as described above.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By setting a steering mechanism and utilizing the cooperation between the lifting assembly and the locking assembly, the cutting knife can be turned 180 degrees, so that when one blade of the cutting knife is severely worn, the sharp blade on the other side of the cutting knife can be replaced to perform the straw cutting operation, thereby ensuring the cutting effect of the cutting knife when the harvester is harvesting, making full use of the double-edged design of the cutting knife, maximizing the use of the cutting knife, and thus extending the service life of the cutting knife;

[0023] Specifically, when the blade of the cutting knife is switched, the control system can drive the cylinder to move and pull the moving frame to rise. During the rising process of the moving frame, the moving block can pull the lifting rod to separate the roller from the positioning groove under the cooperation of the driving member and the guide member, thereby releasing the locking state of the rotating rod. Subsequently, the ratchet plate and the ratchet wheel that follow the rising of the moving frame enter into a meshing transmission state, which can force the rotating rod to drive the cutting knife to switch the blade. During the switching process, the roller slides along the positioning wheel until the cutting knife is switched. The roller is combined with the positioning groove again, which can lock the position state of the rotating rod and the cutting knife, so that the cutting knife can perform cutting operations with the sharp blade on the other side. The whole process does not require manual intervention. With the cooperation between the lifting assembly and the locking assembly, the switching operation of the cutting knife blade can be completed conveniently and quickly.

[0024] A cutting structure is also provided, which includes a cutting knife. When the wear of the blades on both sides of the cutting knife is relatively serious, the cutting knife can be quickly replaced by utilizing the elasticity of the U-shaped connector itself and the cooperation between the plug-in block and the adapter slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the lower cutter device of a corn harvester.

[0026] Figure 2 It is a structural schematic diagram of the cooperation between the mounting cylinder and the transport mechanism in the lower cutter device of a corn harvester.

[0027] Figure 3 It is a schematic diagram of the structure of the installation cylinder and the clamping and transporting roller in the lower cutter device of the corn harvester.

[0028] Figure 4 This is a schematic diagram of the structure inside the installation cylinder in the lower cutter device of the corn harvester.

[0029] Figure 5 It is a structural schematic diagram of the connection between the steering mechanism and the cutting structure in the lower cutter device of a corn harvester.

[0030] Figure 6 It is a schematic diagram of the structure of the steering mechanism in the lower cutter device of the corn harvester.

[0031] Figure 7 The schematic diagram is a structural diagram of the connection between the trigger structure and the connecting frame in the lower cutter device of the corn harvester.

[0032] Figure 8 It is a schematic diagram of the structure of the driving parts in the lower cutter device of the corn harvester.

[0033] Fig. 9 It is a schematic diagram of the structure of the guide part in the lower cutter device of the corn harvester.

[0034] Fig.10 It is a structural schematic diagram of the positioning structure in the lower cutter device of a corn harvester.

[0035] Fig.11 It is a schematic diagram of the structure of the cutting structure in the lower cutter device of a corn harvester.

[0036] In the figure: 1, storage plate; 2, lever mechanism; 201, paddle; 3, conveying mechanism; 301, clamping and transporting roller; 4, cutting knife; 401, plug-in block; 5, mounting cylinder; 6, U-shaped connector; 7, transmission structure; 8, cylinder; 9, fixed sleeve; 10, ratchet plate; 11, ratchet; 12, guide plate; 1201, vertical slot; 1202, inclined slot; 1203, moving slot; 13, moving frame; 14 , rotating rod; 1401, adapter groove; 15, positioning wheel; 1501, positioning groove; 16, roller; 17, connecting plate; 18, moving block; 1801, inclined plane; 1802, insertion groove; 1803, upper bottom surface; 19, lifting rod; 1901, baffle; 20, longitudinal member; 2001, trigger rod; 21, sliding rod; 2101, sliding block; 22, first spring; 23, second spring; 24, pulley. DETAILED DESCRIPTION

[0037] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0038] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0039] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0040] See also Figure 1-Figure 11 In an embodiment of the present invention, a lower cutter device of a corn harvester includes:

[0041] A storage plate 1, on which a conveying mechanism 3 and a transmission structure 7 are installed, on which a mounting tube 5 is arranged, and in which a rotating rod 14 is arranged, the transmission structure 7 can drive the mounting tube 5 to rotate, and during the rotation of the mounting tube 5, a cutting structure connected to the rotating rod 14 can cut the straw on the conveying mechanism 3;

[0042] Preferably, see Figure 1 , Figure 2 The storage plate 1 is connected to the harvester and is controlled by the control system of the harvester to be deflected relative to the harvester so that the harvester can harvest the corn. The storage plate 1 is also provided with a lever mechanism 2. When the harvester is working, the lever mechanism 2 is controlled by the control system to rotate counterclockwise (refer to Figure 1 ), at the same time, the conveying mechanism 3 moves synchronously, and then, along with the movement of the harvester, the paddle 201 on the lever mechanism 2 can push the corn stalks to combine with the conveying mechanism 3. At this time, the cutting structure in working state can cut the stalks to separate the stalks from the soil. Then, with the cooperation of the conveying mechanism 3 and the paddle 201, the stalks can descend and move toward the storage plate 1. During this process, the cutting structure can continuously cut the stalks, thereby breaking the stalks. During this process, the two sets of clamping and transporting rollers 301 of the conveying mechanism 3 can squeeze the corn on the stalks to make them fall into the collection box, and finally complete the corn harvesting operation.

[0043] Preferably, see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Fig.11 The cutting structure includes a U-shaped connecting member 6, and a cutting knife 4 is fixedly arranged on both sides of the U-shaped connecting member 6, and the U-shaped connecting member 6 is detachably connected to the rotating rod 14 through a clamping member, and the clamping member includes a plug-in block 401 fixedly arranged on the inner wall of the U-shaped connecting member 6, and the plug-in block 401 is adapted to the adapting groove 1401 provided on the rotating rod 14;

[0044] In combination with the above, when the harvester is working, the transmission structure 7 is controlled by the control system to drive the mounting tube 5 to rotate clockwise (refer to Figure 1 ), after working for a long time, the blade of the cutting knife 4 will be worn, which will cause the sharpness of the cutting knife 4 to decrease, so that the chopping effect of the cutting knife 4 is reduced. At this time, the cutting knife 4 will not be able to chop the straw, and eventually the lower cutting knife of the harvester will be blocked by material. Therefore, it is necessary to regularly grind the blade of the cutting knife 4. When the cutting knife 4 is severely worn, the cutting knife 4 should be replaced;

[0045] For details, please refer to Fig.11 The above-mentioned plug-in block 401 is arranged in a "cross" structure. It is particularly important to note that the above-mentioned U-shaped connector 6 has a certain elasticity. When the cutting blade 4 is replaced, the elasticity of the U-shaped connector 6 itself can be used to achieve rapid replacement of the cutting blade 4.

[0046] For further information, see Figure 1-Figure 11 , a steering mechanism is also provided in the mounting tube 5, and the steering mechanism includes a lifting assembly and a locking assembly. When the lifting assembly is in motion, it can drive the rotating rod 14 to rotate, and the locking assembly includes a trigger structure and a positioning structure. The positioning structure includes a locking member coaxially fixed to the rotating rod 14. When the lifting assembly drives the rotating rod 14 to rotate, the trigger structure cooperates with the locking member to lock the position of the rotating rod 14 after half a rotation;

[0047] Please combine Figure 1 In the actual harvester, in order to ensure that the cutting knife 4 can cut the straw, the mounting tube 5 should continuously drive the cutting knife 4 to rotate clockwise when performing corn harvesting operations. In this process, only one side of the cutting knife 4 is needed to cut the straw. In terms of improving the service life of the cutting knife 4, when one side of the cutting knife 4 is severely worn, the cutting knife 4 is rotated 180 degrees with the rotating rod 14 as the axis, and the other side of the cutting knife 4 can be used to cut the straw. When both sides of the cutting knife are severely worn, the cutting knife 4 can be replaced. In the present invention, by setting a steering mechanism and utilizing the cooperation between the lifting assembly and the locking assembly in the steering mechanism, the rotation action of the cutting knife 4 can be completed quickly and conveniently without disassembling the cutting knife 4, thereby making full use of the double-edged design of the cutting knife 4 and improving the service life of the cutting knife 4.

[0048] For details, please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 The lifting assembly includes a moving frame 13, the moving frame 13 is slidably disposed in the mounting tube 5, and a ratchet plate 10 is fixedly disposed on the moving frame 13;

[0049] A ratchet wheel 11 is coaxially fixedly connected to the rotating rod 14, and the ratchet wheel 11 cooperates with the ratchet plate 10;

[0050] In detail, a series of ratchet pawls are equidistantly mounted on the ratchet plate 10, and the ratchet pawls are elastically connected to the ratchet plate 10 through springs. Under the connection of the springs, the ratchet pawls can always remain in an expanded state without being driven by external forces. When the ratchet plate 10 rises along the axial direction of the mounting tube 5, the expanded ratchet pawls cooperate with the ratchet teeth on the ratchet wheel 11, and can drive the ratchet wheel 11 to rotate clockwise (refer to Figure 6 ), however, when the ratchet plate 10 descends along the axial direction of the mounting tube 5, when the pawl contacts the ratchet teeth, the squeezing of the pawl by the ratchet teeth can force the pawl to retract toward the ratchet plate 10. At this time, the descending ratchet plate 10 cannot drive the ratchet wheel 11 to rotate.

[0051] It also includes a cylinder 8, which is fixedly disposed in the mounting tube 5, and the telescopic end of the cylinder 8 is fixedly connected to the moving frame 13, and when the cylinder 8 is actuated, it can drive the moving frame 13 to slide along the axial direction of the mounting tube 5;

[0052] Preferably, see Figure 4 , Figure 5 , Figure 6 In the initial state, the telescopic end of the cylinder 8 protrudes from the telescopic cylinder. At this time, a distance is formed between the pawl on the ratchet plate 10 and the ratchet wheel 11. The rotating rod 14 maintains a relatively fixed state with the cooperation of the locking assembly. After the harvester has been working for a period of time, one set of blades of the cutting knife 4 is worn and another set of blades needs to be replaced for work. The control system is used to drive the cylinder 8 to retract. During the retraction process, the cylinder 8 can pull the moving frame 13 and the ratchet plate 10 along the axial direction of the mounting tube 5 toward the ratchet wheel 11. When the pawl of the ratchet plate 11 is combined with the ratchet wheel 10, the locking assembly releases the locking position of the rotating rod 14. Subsequently, as the ratchet plate 11 rises, the ratchet wheel 10 drives the rotating rod 14 to rotate clockwise (combined with Figure 6 ), until the ratchet plate 11 is separated from the ratchet wheel 10, the ratchet wheel 11 just drives the rotating rod 14 to rotate 180 degrees, so that the other set of blades of the cutting knife 4 is in the cutting position. At the same time, the locking assembly is actuated again to lock the position of the rotating rod 14, so that the position of the cutting knife 4 remains unchanged for subsequent straw cutting operations.

[0053] For details, please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Fig.10 , Fig.11 The locking member includes a positioning wheel 15, the positioning wheel 15 is coaxially fixedly connected to the rotating rod 14, and a positioning groove 1501 is opened on the positioning wheel 15, and two groups of positioning grooves 1501 are equidistantly arranged along the circumferential direction of the positioning wheel 15;

[0054] The positioning structure also includes a fixed sleeve 9, which is fixedly arranged in the installation tube 5, and a lifting rod 19 is slidably arranged in the fixed sleeve 9, and a pulley 24 is rotatably installed on one end of the lifting rod 19 away from the positioning wheel 15, and a roller 16 is rotatably installed on the other end of the lifting rod 19, and the roller 16 is adapted to the positioning groove 1501. In particular, the axis of the positioning groove 1501 is lower than the axis of the roller 16, that is, when the roller 16 is engaged with the positioning groove 1501, the axis of the roller 16 should be closer to the axis of the rotating rod 14 than the axis of the positioning groove 1501. At this time, the locking effect of the roller 16 on the rotating rod 14 makes the rotating rod 14 unable to rotate when the roller 16 is not completely separated from the positioning groove 1501;

[0055] It also includes a second spring 23, which is sleeved on the lifting rod 19 and placed in the fixed sleeve 9, and one end of the second spring 23 abuts against the upper bottom of the fixed sleeve 9, and the other end abuts against the blocking piece 1901 formed on the lifting rod 19;

[0056] Specifically, the second spring 23 is always in a compressed state. The second spring 23 in the compressed state pushes the blocking piece 1901 to abut against the lower bottom of the fixed sleeve 9. At this time, the roller 16 is combined with one group of positioning grooves 1501 to lock the position of the rotating rod 14. Combined with the above, when the mobile frame 13 rises, the trigger structure cooperates with the pulley 24 to pull the lifting rod 19 to rise along the axial direction of the fixed sleeve 9. During the rising process, the second spring 23 is further compressed, and the roller 16 can gradually disengage from the positioning groove 1501, and when the ratchet 13 is lifted, the lifting rod 19 is lifted. When the slat 10 is combined with the ratchet 11, the roller 16 is completely separated from the positioning groove 1501. At this time, the locking position of the rotating rod 14 is released, and the ratchet 11 can drive the rotating rod 14 to rotate until the ratchet 11 rotates one hundred and eighty degrees. The trigger structure is separated from the pulley 24, and the second spring 23 releases the elastic potential energy, which will force the lifting rod 19 to descend, so that the roller 16 is combined with the positioning groove 1501 again, and the position of the cutting knife 4 is locked, so that when the harvester is working later, it can continue to use the other side of the cutting knife 4 to perform straw cutting operations.

[0057] For further information, see Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 The trigger structure includes a connecting plate 17, the connecting plate 17 is fixedly connected to the moving frame 13, and a slide bar 21 is fixedly provided on the connecting plate 17, and a slider 2101 is fixedly provided on one end of the slide bar 21 away from the connecting plate 17;

[0058] It also includes a moving block 18, the moving block 18 is provided with an insertion groove 1802, the slider 2101 is inserted in the insertion groove 1802, and a first spring 22 is slidably provided on the slide bar 21, one end of the first spring 22 abuts against the connecting plate 17, and the other end abuts against the moving block 18;

[0059] In detail, the first spring 22 is in a compressed state. The first spring 22 in the compressed state pushes the moving block 18 away from the connecting plate 17. The moving block 18 is arranged in a "right-angled trapezoid" structure, including an upper bottom surface 1803 and an inclined surface 1801. In the initial state, Figure 6 As shown, the upper bottom surface 1803 is in contact with the pulley 24. When the moving frame 13 is driven by the cylinder 8 to rise, the moving block 18, with the cooperation between the driving member and the guide member, can first follow the moving frame 13 to rise, forcing the roller 16 to separate from the positioning groove 1501. After the roller 16 is combined with the positioning groove 1501 again, the moving frame 13 driven by the cylinder 8 to descend can, with the cooperation of the driving member and the guide member, drive the moving block 18 to return to the initial position, so as to subsequently perform a steering operation on the cutting knife 4.

[0060] For details, please refer to Figure 4-Figure 9 The moving block 18 is connected to a guide member fixedly arranged in the mounting tube 5 through a driving member, and the driving member includes a longitudinal member 20 fixedly connected to the moving block 18, and a trigger rod 2001 is fixedly arranged on a side of the longitudinal member 20 away from the moving block 18, and the trigger rod 2001 cooperates with the guide member to force the moving block 18 to slide along the axial direction of the slide rod 21;

[0061] The guide member includes a guide plate 12, which is fixedly arranged in the installation tube 5, and a fitting groove is provided on the guide plate 12, and the trigger rod 2001 is slidably arranged in the fitting groove. When the moving frame 13 moves relative to the installation tube 5, the fitting groove cooperates with the trigger rod 2001 to force the moving block 18 to slide relative to the slide rod 21;

[0062] The engaging groove body includes a vertical groove 1201, an inclined groove 1202 and a movable groove 1203;

[0063] In the initial state, see Figure 6 , Fig. 9, the trigger rod 2001 is located at the end of the vertical slot 1201 away from the inclined slot 1202, and the roller 16 is combined with the positioning slot 1501. When the cutting blade of the cutting knife 4 needs to be switched, the driving cylinder 8 drives the moving frame 13 to rise. At this time, the trigger rod 2001 slides along the vertical slot 1201. During this process, due to the contact and cooperation between the upper bottom surface 1803 and the pulley 24, the rising moving block 18 can drive the lifting rod 19 to rise synchronously, thereby causing the roller 16 to separate from the positioning slot 1501;

[0064] When the trigger rod 2001 moves to engage with the inclined groove 1202, the roller 16 is completely separated from the positioning groove 1501. As the moving frame 13 continues to rise, the ratchet plate 10 cooperates with the ratchet wheel 11 to drive the ratchet wheel 11 to rotate. At the same time, the contact and extrusion of the groove wall of the inclined groove 1202 on the trigger rod 2001 can force the moving block 18 to move toward the connecting plate 17 at the same time. In this process, the first spring 22 is further compressed, and the pulley 24 slowly engages with the inclined surface 1801. As the moving block 18 continues to move, the pulley 24 slides along the inclined surface 1801, and then the lifting rod 19 slowly descends along the axial direction of the fixed sleeve 9. After the wheel 24 is separated from the moving block 18, the trigger rod 2001 moves to engage with the moving groove 1203, and then, the lifting rod 19 is rapidly lowered under the action of the first spring 22, so that the roller 16 contacts the outer edge of the positioning wheel 15. At this time, the moving frame 13 continues to rise, and the ratchet 11 continues to rotate under the drive of the ratchet plate 10. The roller 16 will slide along the outer edge of the positioning wheel 15 until the ratchet 11 rotates 180 degrees. The trigger rod 2001 moves to the end of the travel of the moving groove 1203, and the roller 16 is engaged with the next set of positioning grooves 1501 under the action of the elastic potential energy released by the first spring 22. At this time, the position of the rotating rod 14 is locked;

[0065] Then the cylinder 8 moves the moving frame 13 downward, and during the downward process, the trigger rod 2001 moves along the moving groove 1203 until the trigger rod 2001 moves to combine with the inclined groove 1202, and the moving block 18 approaches the pulley 24. As the moving frame 13 continues to descend, the trigger rod 2001 is squeezed by the groove wall of the inclined groove 1202, which can drive the moving block 18 to gradually move away from the connecting plate 17, until the trigger rod 2001 combines with the vertical groove 1201 and moves to the end of the stroke of the vertical groove 1201, and the moving block 18 just returns to the initial position to facilitate the subsequent operation of the cutting knife 4.

[0066] A corn harvester is also proposed, which comprises the corn harvester lower cutting knife device as described above.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A lower cutter device for a corn harvester, characterized in that: include: A storage plate (1), wherein a conveying mechanism (3) and a transmission structure (7) are installed on the storage plate (1), a mounting tube (5) is arranged on the transmission structure (7), a rotating rod (14) is arranged inside the mounting tube (5), the transmission structure (7) is used to drive the mounting tube (5) to rotate, and during the rotation of the mounting tube (5), a cutting structure connected to the rotating rod (14) is used to cut the straw on the conveying mechanism (3); A steering mechanism is also provided in the mounting tube (5), the steering mechanism comprising a lifting assembly and a locking assembly. When the lifting assembly is in motion, the rotating rod (14) is driven to rotate. The locking assembly comprises a trigger structure and a positioning structure. The positioning structure comprises a locking member coaxially fixedly arranged with the rotating rod (14). When the lifting assembly drives the rotating rod (14) to rotate, the trigger structure cooperates with the locking member to lock the position of the rotating rod (14) after half a rotation. The lifting assembly comprises a movable frame (13), the movable frame (13) being slidably disposed in the mounting tube (5), and a ratchet plate (10) being fixedly disposed on the movable frame (13); A ratchet wheel (11) is coaxially fixedly connected to the rotating rod (14), and the ratchet wheel (11) cooperates with the ratchet plate (10); It also comprises a cylinder (8), wherein the cylinder (8) is fixedly arranged in the mounting tube (5), and the telescopic end of the cylinder (8) is fixedly connected to the movable frame (13), and when the cylinder (8) is actuated, the movable frame (13) is driven to slide along the axial direction of the mounting tube (5); The locking member comprises a positioning wheel (15), the positioning wheel (15) being coaxially fixedly connected to the rotating rod (14), and the positioning wheel (15) being provided with positioning grooves (1501), wherein two groups of positioning grooves (1501) are equidistantly arranged along the circumferential direction of the positioning wheel (15).

2. A corn harvester lower cutter device according to claim 1, characterized in that: The positioning structure further comprises a fixed sleeve (9), the fixed sleeve (9) being fixedly arranged in the mounting tube (5), and a lifting rod (19) being slidably arranged in the fixed sleeve (9), a pulley (24) being rotatably mounted on one end of the lifting rod (19) away from the positioning wheel (15), and a roller (16) being rotatably mounted on the other end of the lifting rod (19), and the roller (16) being adapted to fit the positioning groove (1501); It also includes a second spring (23), which is sleeved on the lifting rod (19) and placed in the fixed sleeve (9), and one end of the second spring (23) abuts against the upper bottom of the fixed sleeve (9), and the other end abuts against a blocking piece (1901) formed on the lifting rod (19).

3. A corn harvester lower cutter device according to claim 1, characterized in that: The trigger structure comprises a connecting plate (17), the connecting plate (17) being fixedly connected to the movable frame (13), and a sliding rod (21) being fixedly arranged on the connecting plate (17), and a sliding block (2101) being fixedly arranged on one end of the sliding rod (21) away from the connecting plate (17); It also includes a moving block (18), the moving block (18) is provided with an insertion groove (1802), the sliding block (2101) is inserted into the insertion groove (1802), and a first spring (22) is slidably arranged on the sliding rod (21), one end of the first spring (22) is in contact with the connecting plate (17), and the other end is in contact with the moving block (18).

4. A lower cutter device for a corn harvester according to claim 3, characterized in that: The moving block (18) is connected to a guide member fixedly arranged in the mounting cylinder (5) via a driving member, the driving member comprising a longitudinal member (20) fixedly connected to the moving block (18), a trigger rod (2001) being fixedly arranged on a side of the longitudinal member (20) away from the moving block (18), the trigger rod (2001) cooperating with the guide member to force the moving block (18) to slide along the axial direction of the slide rod (21).

5. A corn harvester lower cutter device according to claim 4, characterized in that: The guide member comprises a guide plate (12), the guide plate (12) being fixedly arranged in the installation tube (5), and the guide plate (12) being provided with an embedded groove, the trigger rod (2001) being slidably arranged in the embedded groove, and when the moving frame (13) moves relative to the installation tube (5), the embedded groove cooperates with the trigger rod (2001) to force the moving block (18) to slide relative to the sliding rod (21).

6. A lower cutter device for a corn harvester according to claim 5, characterized in that: The engaging groove body comprises a vertical groove (1201), an inclined groove (1202) and a movable groove (1203).

7. The lower cutter device of a corn harvester according to claim 1, characterized in that: The cutting structure comprises a U-shaped connecting piece (6), a cutting knife (4) is fixedly arranged on both left and right sides of the U-shaped connecting piece (6), and the U-shaped connecting piece (6) is detachably connected to the rotating rod (14) via a clamping piece, and the clamping piece comprises a plug-in block (401) fixedly arranged on the inner wall of the U-shaped connecting piece (6), and the plug-in block (401) is adapted to an adapting groove (1401) provided on the rotating rod (14).

8. A corn harvester, characterized in that: The invention comprises a lower cutting knife device of a corn harvester as described in claim 1.

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