JP2007089418A - Reaping portion-lifting or lowering structure of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaping portion-lifting or lowering structure of a combine harvester, in which the reaping portion upward or downward swingably disposed in the front of a travel machine frame is lifted or lowered, while following the ground, and which can reduce the size of a balance structure for supporting the weight load of the reaping portion and can easily move and open the reaping portion. <P>SOLUTION: This reaping portion-lifting or lowering structure of the combine harvester is characterized by disposing an elastic balance mechanism 50 for elastically receiving and supporting the reaping portion 3, separably contact-supporting the reaping portion 3 lowered in a reaping work field with the elastic balance mechanism 50, and setting the reaping portion 3 to a position (n) lower than a travel ground (G) and higher than a mechanical lowering limit (m) in a state that the elastic recovery force of the elastic balance mechanism 50 deformed by the contact support of the reaping portion 3 is balanced on the weight of the reaping portion 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a harvesting unit lifting structure for a combine that is configured to raise and lower a cutting unit disposed at the front of a machine body while following the ground.

The harvesting part lifting structure of the combine configured to move the cutting part up and down while following the ground is a so-called automatic cutting height control structure that controls the hydraulic cylinder for lifting the cutting part based on the detection information from the cutting height sensor. The cutting height can be stably maintained with a low-cost configuration, and for example, as disclosed in Patent Document 1, the support rod is extended and contracted between the cutting portion and the front end portion of the traveling machine body. While being installed freely, the grounding load of the cutting portion is reduced by bearing the weight load of the cutting portion with a balancing coil spring fitted to the support rod.
JP 2004-267123 A

  In the above-described conventional cutting / lifting structure, a configuration is adopted in which a support rod for mounting a coil spring is installed between the cutting part and the front part of the traveling machine body, and the support rod is expanded and contracted according to the lifting / lowering of the cutting part. Therefore, it was necessary to make the support rod large enough to expand and contract with a large stroke corresponding to the lifting range of the cutting part. In addition, it takes time and effort to pivotally connect both ends of the extendable support rod to the cutting part and the front part of the traveling machine.

  In recent years, it has been desired to improve the maintainability of the interior of the aircraft that is hidden by the cutting parts such as the engine output section and the transmission case around the combiner. A device that opens widely around the inside of the fuselage concealed by the cutting part, such as turning open laterally outward, has also been put into practical use.

  In this way, when the structure that detaches and revolves the mowing part is introduced to a model with the mowing part configured to follow the ground, the connection between the hydraulic cylinder for raising and lowering the mowing part and the mowing part is released. In addition to this, it is necessary to release the connection between the cutting rod and the support rod on which the coil spring is mounted, and it is predicted that the operation for moving the cutting portion becomes troublesome.

  The present invention has been made paying attention to such a point, and in the harvesting part lifting structure of the combine that is configured to raise and lower the cutting part while following the ground, a balance structure that supports the weight load of the cutting part is provided. The object is to make it possible to reduce the size and to easily move and open the cutting part.

A first invention is a harvesting part lifting structure of a combine configured to raise and lower a cutting part arranged to be swingable up and down at the front part of a traveling machine body.
Equipped with an elastic balance mechanism that elastically receives and supports the mowing part, and is configured so that the mowing part lowered to the mowing work area is supported by the elastic balance mechanism so as to be separable,
In a state where the elastic restoring force of the elastic balance mechanism deformed by supporting the cutting portion and the weight of the cutting portion is balanced, the cutting portion is lower than the traveling ground and higher than the mechanical lowering limit. It is set so that it exists.

  According to the above configuration, when the mowing unit is lowered in the field, the mowing unit is grounded with a small contact pressure, and ascends and descends following the unevenness of the farm scene as the aircraft runs. In this case, it is lowered until the elastic restoring force of the elastic balance mechanism and the weight of the cutting part are balanced, but does not follow a deeper recess than that, and the cutting part is lowered to the mechanical lowering limit. There is nothing.

  The elastic balance mechanism abuts and supports the cutting part lowered to the cutting work height range, but when the cutting part is greatly raised beyond the cutting work height range, the cutting part is separated from the elastic balance mechanism. (Or the elastic balance mechanism will be separated from the airframe), and it is shorter in the front-rear direction than in the interlocking connection in the entire lifting range of the cutting unit.

  Therefore, according to 1st invention, it can comprise in the small thing which functions only when a cutting part falls to the cutting work height range.

According to a second invention, in the first invention,
The elastic balance mechanism is equipped with an initial elastic deformation state.

  According to the said structure, compared with the case where an elastic balance mechanism is comprised in a free elastic state, it becomes a compact thing short in an elastic displacement direction.

According to a third invention, in the first or second invention,
The mowing portion is configured to be capable of pivoting and swinging laterally around a longitudinal fulcrum on the base end side.

  According to the above configuration, when the mowing part is pivoted and opened for maintenance, the mowing part can be moved without requiring a connection release operation with the mowing part (or the machine body), and the operability is excellent.

  1 and 2 show a self-decomposing combine. This combine is connected to a front part of a traveling machine body 2 provided with a pair of left and right crawler traveling devices 1 and a mowing unit 3 having a two-row cutting specification is connected to the traveling machine body 2 so as to be movable up and down and laterally movable. The apparatus 5 and the grain collection tank 6 are mounted.

  The mowing unit 3 is a pair of left and right pulling devices 7 that raises the planted cereal to a predetermined mowing posture, a clipper-type mowing device 8 that cuts the raised planted culm, and the mowing cereal is scraped backward. It comprises a pair of left and right auxiliary conveyor belts 9, a pair of left and right rotating packers 10 that stirs and joins the stock of the harvested cereal grains, a feeding and conveying device 11 that conveys the harvested grain grains upward and rearward, and the like. The entire cutting part 3 is supported so as to be swingable up and down around a lateral fulcrum P at the rear base end, and is also driven up and down by a hydraulic cylinder 12.

  The supply and transport device 11 includes a stock holding and transporting mechanism 13 and a tip locking and transporting mechanism 14, and the whole supply and transport device 11 is adjusted to swing up and down around the lateral fulcrum P, thereby cutting the harvested grain. A handling depth adjustment function is provided in which the holding position for the cocoon is changed up and down to change and adjust the cereal delivery position to the feed chain 15 provided on the lateral outside of the threshing device 4 in the cocoon length direction. The feed conveying device 11 is driven to swing up and down by a drive mechanism (not shown) based on the detection of the culm length of the harvested culm, and the automatic handling depth that maintains the culm length inserted into the threshing device 5 regardless of the culm length. Control is to be performed.

  The mowing unit 3 is provided with a mowing unit frame 17 made of a square pipe material that supports the pulling device 7, the mowing device 8, the auxiliary transport belt 9, the rotary packer 10, and the like in a forward downward inclined posture. A rear end base portion of the part frame 17 is connected and supported on an upper portion of a base 18 provided at a front end portion of the traveling machine body 2 so as to be able to swing up and down around the lateral fulcrum P. The hydraulic cylinder 12 is a plunger-type single-acting cylinder, and the cutting portion 3 is driven up by its extension operation, and the cutting portion 3 is lowered by its free shortening operation.

  As shown in FIGS. 5 and 6, the base of the mowing frame 17 is provided with a laterally proximal boss 17a configured in a cylindrical shape concentric with the lateral fulcrum P. A counter shaft 19 penetrating to the left and right is rotatably supported via a pair of left and right bearing brackets 21 and 22 provided on the upper portion of the base 18. In the following description, the designation in the left-right direction indicates the direction with respect to the aircraft, and in the front views of FIGS.

  An input pulley 23 is attached to the right end of the countershaft 19, and a PTO shaft (not shown) provided in the traveling mission case 24 and the countershaft 19 are connected via a belt tension type mowing clutch. The belt is linked. Further, a transmission case 25 made of a round pipe material extends from the base end boss portion 17a toward the front upper side, and the transmission shaft 26 and the counter shaft 19 inserted through the transmission case 25 are located in the base end boss portion 17a. Thus, the bevel gear is interlocked and driven by the power transmitted from the counter shaft 19 to the transmission shaft 26, so that the device 7, the mowing device 8, the auxiliary transport belt 9, and the rotary packer 10 are driven.

  As shown in FIG. 4, the countershaft 19 that protrudes to the left outward from the left bearing bracket 21 is equipped with a bevel gear case 27 that is rotatable around the countershaft axis, that is, around the lateral fulcrum P. In addition, a transmission shaft 28 interlocked with the counter shaft 19 with the bevel gear extends obliquely upward from the bevel gear case 27, and the stock holding and transporting mechanism 13 of the supply / conveyance device 11 with the power extracted from the transmission shaft 28 and The tip locking conveyance mechanism 14 is driven.

  The PTO shaft (not shown) that transmits the power for driving the cutting unit to the counter shaft 19 is driven at a speed synchronized with the forward traveling speed, whereby each mechanism of the cutting unit 3 is synchronized with the traveling speed. Driven at speed.

  The mowing unit 3 configured as described above is supported so as to be capable of lateral movement and swivel opening, and the structure thereof will be described below in detail with reference to FIGS.

  A cast turning bracket 31 that can turn around a longitudinal fulcrum X is disposed on the left side of the base 18, and the left bearing bracket 21 is connected and fixed to the upper surface of the turning bracket 31. A swivel arm 32 having a sheet metal structure is extended from 31 toward the right (inward of the machine body). The right bearing bracket 22 is supported by an extension support portion 32a that protrudes further to the right from the swivel arm 32. The bearing bracket 22 is detachably attached to the upper surface of the right base 18a erected on the main frame 16 by bolts 33. It is connected to.

  The swivel arm 32 is equipped with a cutting portion lateral movement mechanism 34. The mowing unit lateral movement mechanism 34 includes a rectangular loop-shaped swing support frame 35 supported by the swing arm 32 so as to be swingable about a lateral fulcrum a, and a horizontal movement between the left and right arms of the swing support frame 35. There are provided a screw shaft 36 that is mounted on and supported, a movable piece 37 that is screwed onto the screw shaft 36, an electric motor 38 that drives the screw shaft mounted on the swing support frame 35, and the like. The connecting piece 35b provided on the lower end lateral flange portion 35a of the frame 35 and the plunger 12a of the hydraulic cylinder 12 are connected by a connecting pin 39 that can be inserted and removed. As shown in FIG. 14, the connecting pin 39 is provided with a connecting plate 39a and a handle 39b. Usually, the connecting plate 39a is fastened to the connecting piece 35b by a bolt 40 and connected to the plunger 12a. Is maintained, and the connection between the cutting portion lateral movement mechanism 34 and the plunger 12a is released by removing the bolt 40 and extracting the connection pin 39.

  The laterally proximal boss portion 17a of the cutting frame portion 17 is supported so as to be slidable to the left and right along the counter shaft 19 between the left and right bearing brackets 21 and 22, and is capable of swinging down its own weight around the lateral fulcrum P. The mowing part frame 17 is received and supported by the lower end horizontal part 35a of the swing support frame 35, and the swing support frame 35 is swung around the lateral fulcrum a by the hydraulic cylinder 12, thereby supporting the swing. The cutting part 3 received and supported by the frame 35 is swung up and down around the lateral fulcrum P. The cutting part frame 17 is engaged from above without applying a load to the movable piece 37 above the cutting part frame receiving position by the swing support frame 35, and the screw shaft 36 is rotationally driven by the electric motor 38. By moving the movable piece 37 to the left and right, the entire cutting unit 3 is moved laterally with a constant stroke. In addition, a regulating rod 41 that crosses the upper surface proximity position of the cutting part frame 17 is fixed to the swinging support frame 35 so that the cutting part frame 17 is lifted from the lower end horizontal part 35a of the swinging support frame 35 and is movable. Disengagement from the piece 37 is prevented.

  The laterally movable mowing unit 3 is basically used by being moved to one of the left and right stroke ends, and the mowing unit 3 is moved to the left stroke end during the normal mowing operation. (See FIG. 6), and the left end of the cutting unit 3 is projected to the left from the stepping margin of the left crawler traveling device 1. Further, at the time of half-splitting work that cuts and harvests by cutting through the center of the field, the cutting unit 3 is moved to the right stroke end (see FIG. 5) and positioned within the body width. In addition, the mowing unit 3 is moved to the right stroke end even during non-work such as traveling outside the field, moving on a truck bed, or storing in a garage.

  As shown in FIG. 4, the front end portion of the feeding / conveying device 11 provided in the mowing unit 3 can be slid up and down on a guide rod 42 that is formed in an arc shape with the lateral fulcrum P as the center and fixed upright. The supply and transport device 11 is configured to be able to swing up and down to adjust the handling depth, and when the cutting unit 3 is moved laterally, the supply and transport device 11 is moved to the proximal transmission shaft 28. Is pivoted relatively horizontally around the axis b. That is, when the mowing unit 3 is moved laterally, the front end of the supply / conveyance device 11 whose front end is engaged and supported by the guide rod 42 is always raised and moved so as to be in the rear position of the device 7. The rear end portion of the conveying device 11 is in the vicinity of the starting end of the feed chain 15, thereby raising the cereals from the raising device 7 to the starting end portion of the feeding and conveying device 11 regardless of the lateral movement position of the cutting unit 3, and The cereal delivery from the terminal end of the supply / conveyance device 11 to the starting end of the feed chain 15 is performed smoothly.

  On the left outer side of the reaping part 3, a cereal supply table 45 for temporarily placing cereals that have been hand-cut in the pillow threshing operation is provided. The cereal supply table 45 is supported so as to be laterally movable, and a detailed description of the structure is omitted. However, the cereal supply table 45 is attached to the start end of the feed chain 15 regardless of the lateral movement of the cutting unit 3. It is always held at a constant position in the lateral direction.

  In this combine, the following structure is provided in order to keep the cutting height constant by raising and lowering the cutting portion 3 according to the ground height in a normal cutting and harvesting operation.

  That is, as shown in FIG. 9, when the cutting part 3 is lowered by its own weight to the cutting work height region, the lower end reed part 35 a of the swing support frame 35 in the cutting part lateral movement mechanism 34 is The elastic balance mechanism 50 attached to the front end is elastically contacted and supported.

  As shown in FIG. 11, the elastic balance mechanism 50 includes a pair of front and rear spring receiving members 51, 52 opposed to each other so that the interval can be changed, and a coil spring 53 that is initially compressed and sandwiched between the spring receiving members 51, 52. The support rod 54 is inserted into the center of the spring receiving members 51 and 52 so as to prevent the gap between the spring receiving members 51 and 52 from being enlarged. The support rod 54 is made of a bolt material having a front end as a head. The support rod 54 is screwed in from the front to adjust the maximum distance between the spring receiving portions 51 and 52, so that the clamped coil bar is clamped. The initial compression state of 53 can be adjusted. Each spring receiving member 51, 52 is press-formed in a cup shape for positioning and fitting the coil spring 53, and a pair of support protrusions 51a, 52a are bent and extended at diagonal positions on the outer peripheral portions thereof. Attachment holes 55 and 56 are formed in 51a and 52a.

  On the other hand, two support rods 57 for mounting the elastic balance mechanism 50 are fixed to the front portion of the machine body frame 16 in the traveling machine body 2 through a bracket 58 in a cantilever direction facing forward. The support rods 57 are arranged at intervals corresponding to the pitch of the mounting holes 55 and 56, and the unit-like elastic balance mechanism 50 is supported via the mounting holes 55 and 56 in the front and rear support protrusions 51a and 52a. The elastic balance mechanism 50 is supported on the front part of the traveling machine body 2 in a forward cantilever shape that rises in front of the heel by being inserted into 57 from the front.

  The front surface of the front spring receiving member 51 functions as a receiving portion s that contacts and supports the lower end lateral flange portion 35 a of the swing support frame 35 provided in the cutting portion 3.

  The initial compressive load of the elastic balance mechanism 50 is adjusted by the operation of the support rod 54 so as to be a value slightly smaller than the weight of the cutting portion 3, and the elastic balance mechanism 50 is compressed and deformed by abutting and supporting the cutting portion. In a state in which the elastic restoring force of the cutting unit 3 and the weight of the cutting unit 3 are balanced, they are at a position lower than the traveling ground G and at a position n higher than the mechanical lowering limit m of the cutting unit 3 (see FIG. 15). In the state where the bowl-shaped grounding body 59 arranged at the front lower part of the cutting unit 3 is grounded and received, the grounding body 59 is applied to the ground with a relatively small ground pressure (for example, 5 to 25 kgf). Set to ground.

  In this way, the cutting unit 3 is lowered by its own weight and lightly grounded and supported for cutting, so that the cutting unit 3 can be operated even if the field is undulated or the front and back tilt posture of the traveling machine body 2 is changed. The cutting height is stabilized by following the ground. A rubber mudguard cover 61 is wound around the coil spring 53 in the elastic balance mechanism 50 to prevent foreign matters such as mud from adhering to and entering the elastic balance mechanism 50.

  As shown in FIG. 11, the shim plate 60 having an arbitrary thickness is interposed between the elastic balance mechanism 50 and the bracket 58, so that the position of the receiving portion s in the elastic balance mechanism 50 can be changed back and forth. . By this adjustment, the amount of compressive deformation of the coil spring 53 in a state where the cutting unit 3 is grounded can be changed, and the grounding pressure of the grounding body 59 can be set and adjusted according to the hardness of the field. In addition, as shown in FIG. 12, the shim plate 60 is locked to the both support rods 57 to maintain the mounting posture.

  In this way, the cutting unit 3 is lowered by its own weight and lightly supported by grounding to perform the cutting operation, so that the cutting unit 3 can be operated even if the field is undulated or the front and back tilt posture of the traveling machine body 2 is changed. A constant cutting height is maintained by following the ground. A rubber mudguard cover 61 is wound around the coil spring 53 of the elastic balance mechanism 50 to prevent foreign matters such as mud from adhering to and entering the elastic balance mechanism 50.

  As shown in FIG. 15, the hydraulic cylinder 12 for raising and lowering the cutting unit is controlled by an electromagnetic control valve 80, and the controller 87 that controls the electromagnetic control valve 80 includes an operation provided in the operation unit 4. A multi-contact type switch mechanism 82 for detecting the operating position of the lever 81, a push button type ascending switch 83 and a descending switch 84 provided on a grip portion of the operating lever 82 or a control panel (not shown), and a grounding provided on the control panel A mowing mode changeover switch 85 and an upper limit switch 86 for detecting that the mowing unit 3 has been raised to a predetermined upper limit position are connected.

  The operation lever 82 is configured as a neutral return type, and the electromagnetic control valve 80 is switched to the corresponding position while being operated to the “neutral”, “up”, and “down” operation positions. When the grounding mowing mode changeover switch 85 is turned on, the electromagnetic control valve 80 is maintained at “down”, and the trimming unit 3 in its own weight lowering state (floating) enters the grounding mowing mode that follows the grounding as described above. In the harvesting and harvesting operation in the ground cutting mode, when the aircraft has finished the one-stroke cutting and reaches the headland, the ground cutting mode is interrupted by pressing the lift switch 83 once, and the electromagnetic control valve 80 is turned on. It is switched to “rising”. When the upper limit switch 86 detects that the mowing unit 3 has been raised and reached the upper limit, the electromagnetic control valve 80 is switched to “neutral” and the mowing unit 3 is held at the upper limit position. Run and change direction. When the lowering switch 84 is pressed once at the next cutting start position, the ground cutting mode is restored, and the electromagnetic control valve 80 is maintained at “down” again, and the cutting unit 3 follows the ground.

  When harvesting harvesting at an arbitrary cutting height without following the grounding is performed, the grounding mode switching switch 85 is turned off and the cutting part 3 is maintained at an arbitrary height by the operation lever 81.

  The cutting unit 3 configured as described above can swing and swing leftward and outward for inspection and maintenance. That is, as shown in FIG. 7, when the bolt 33 connecting the free end portion of the right-side bearing bracket 22 and the turning arm 32 to the base 18a is removed, the turning arm 32 and the turning bracket 31 are vertically oriented integrally. It becomes possible to turn around the fulcrum X, and the cutting part 3 supported by the turning arm 32 can turn together with the cutting part lateral movement mechanism 34.

  As shown in FIGS. 5 and 6, an operating rod 65 is inserted into and supported by the bearing bracket 21 so as to be slidable horizontally, and a block member 66 for lowering locking is connected to the right side through end of the operating rod 65. The left end portion of the operation rod 65 is extended and an operation knob 67 is attached, so that the operation rod 65 can be pushed and pulled from the lateral side of the machine body. Normally, the operation rod 65 is pulled out to the outside of the machine body, and the block member 66 is placed and held at a lock release position ur (see FIG. 5) that is closer to the left side than the upper end of the swivel bracket 31.

  To open the mowing unit 3 from the normal harvesting position shown in FIG. 3 (a) to the left lateral outer side of the machine body as shown in FIG. 3 (b), first, the mowing unit 3 has a predetermined height. In the state where it is raised above, it is moved sideways to the left stroke end. Next, the operating rod 65 is pushed inward to the movement limit to move the block member 66 from the unlocking position ur to the lowered locking position r (see FIG. 6) near the end of the turning bracket 31. Next, the cutting part 3 is lowered (down its own weight), and the block member 66 is sandwiched between the contact fitting 68 connected and fixed to the base of the cutting part frame 17 and the upper surface of the swivel bracket 31, and beyond that The mowing unit 3 is prevented from being lowered (see FIG. 13). Thus, in a state where the lowering is prevented through the block member 66, the cutting unit 3 is held at a height slightly raised from the ground.

  The contact fitting 68 is pivotally connected to a check fitting 69 that can swing around a lateral fulcrum y, and the check fitting 69 is mounted in a state where the contact fitting 68 is placed on the upper surface of the block member 66. As shown by the phantom line in FIG. 13, the mowing unit 3 is moved to the right side of the machine body by overlapping engagement with the left outer side of the block member 66 that is prevented from moving to the right side of the machine body. Inadvertent lateral movement is prevented.

  Next, the connection pin 39 that connects the cutting unit frame 7 and the plunger 12a of the hydraulic cylinder 12 is pulled out to release the connection, and the free end portions of the right bearing bracket 22 and the swing arm 32 are connected to the base 8. Remove the bolt 33 connected to the. As a result, the mowing part 3 can be rocked and released around the longitudinal fulcrum X while being slightly lifted from the ground.

  When the cutting part 3 is not moved to the left stroke end, the contact fitting 68 is disengaged from the turning bracket 31 in the right lateral direction, and the lowering lock is performed via the lock member 66 as described above. Since the mowing part 3 cannot be kept floating from the ground, the mowing part 3 cannot be pivoted and released by disconnecting from the hydraulic cylinder 12 as described above.

  [Other Examples]

  (1) When the cutting part 3 has a specification of three or more cutting lines with a large weight, the elastic balance mechanism 50 has two sets of coil springs arranged in parallel on the left and right sides, and the coil springs are arranged in double inside and outside. It should just be a thing with big power. Further, the elastic balance mechanism 50 may be supported in a cantilever manner on the cutting part 3 so that the elastic balance mechanism 50 and the front part of the body frame 16 are in contact with each other.

  (2) In the above-described embodiment, an example of the specification that swings and opens the mowing unit 3 is illustrated, but the base end of the mowing unit 3 is detachably supported on the machine body, and the mowing unit 3 is moved forward and away during maintenance. The present invention can also be applied to those with configured specifications.

(3) The switch mechanism 82, the ascending switch 83, the descending switch 84, the ground mowing mode changeover switch 85 and the upper limit switch 86 shown in FIG. 15 are abolished, and the electromagnetic control valve 80 is mechanically configured. The control valve 80 may be mechanically linked.
If comprised in this way, after operating the operation lever 80 to a lowered position and lowering the cutting part 3, if the operating lever 80 is operated to a neutral position and the cutting part 3 is stopped, that position will be the position of the cutting part 3. This is the lower limit of ground contact. Thereafter, if the operation lever 80 is operated to the lowered position, the lower limit can be brought close to the lower limit m.

Overall side view of self-removing combine Overall plan view of self-removing combine Plan view showing the turning opening operation of the mowing unit Side view showing the base of the mowing part The front view which shows the base of the cutting part laterally moved to the turning impossible position The front view which shows the base of the cutting part laterally moved to the turning operation possible position Plan view showing the base of the mowing part Side view showing the lateral movement structure of the cutting part Side view showing elastic balance support structure of mowing part Front view of elastic balance mechanism Transverse plan view of elastic balance mechanism Front view showing support structure of elastic balance mechanism Side view showing the floating receiving state of the cutting part Longitudinal front view of hydraulic cylinder connection Block diagram of hydraulic cylinder drive system

Explanation of symbols

2 traveling machine body 3 cutting part 16 machine body frame 50 elastic balance mechanism m descent limit n position X longitudinal fulcrum

Claims (3)

A harvesting part raising / lowering structure of a combine configured to raise and lower a cutting part arranged to swing up and down at the front part of a traveling machine body,
Equipped with an elastic balance mechanism that elastically receives and supports the mowing part, and is configured so that the mowing part lowered in the mowing work area is supported by the elastic balance mechanism so as to be separable,
In a state where the elastic restoring force of the elastic balance mechanism deformed by supporting the cutting portion and the weight of the cutting portion is balanced, the cutting portion is lower than the traveling ground and higher than the mechanical lowering limit. The harvesting part raising / lowering structure of the combine characterized by having set.   The combine lifting part raising / lowering structure according to claim 1, wherein the elastic balance mechanism is equipped with an initial elastic deformation state.   3. The harvesting part lifting structure for a combine according to claim 1 or 2, wherein the harvesting part is configured to be capable of pivoting and swinging laterally around a longitudinal fulcrum on the base end side.

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