JP2006211972A - Structure for lifting and lowering reaping part of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for lifting and lowering the reaping part of a combine harvester so as to lift and lower the reaping part by grounding and following, with which a balance structure for supporting the weight load of the reaping part is miniaturized and the reaping part is readily moved and released. <P>SOLUTION: The structure for lifting and lowering the reaping part of a combine harvester is equipped with an elastic balance mechanism 61 for elastically supporting the reaping part at the front part of a traveling machine body. The elastic balance mechanism 61 is composed of a coil spring 62 arranged forward in a cantilever state at the front end part of the traveling main body. The reaping part is separably adjoined and supported by a receiving part arranged at the front end part of the coil spring 62. The structure for lifting and lowering the reaping part of a combine harvester is equipped with a spring force adjustment means for adjusting the initial compression state of the coil spring 62. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 raising / lowering structure of the combine configured to raise and lower the cutting part by following the ground is a so-called automatic cutting height control structure that controls the hydraulic cylinder for raising and lowering 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 part is reduced by partially bearing the weight load of the cutting part with a coil spring for balance that is externally attached 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 unit and the front end of the traveling machine body, and the support rod is expanded and contracted according to the lifting / lowering of the cutting unit. 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, the coil spring has a free length and is attached to the support rod. When the cutting part is lifted greatly out of the working height range, no load is applied to the coil spring, and the cutting part is lowered to the working height range. Since the coil spring is configured so as to bear a part of the weight load of the cutting part, the coil spring is compressed from the free length so that the cutting part brings a spring force to ground with a desired ground load. It will be set.

  Here, even if the cutting part moves up and down within the working height range, the spring force caused by the deformation of the coil spring is not changed so much that the ground pressure is stabilized, and a coil spring having a spring constant as small as possible should be used. desirable. However, when using a coil spring that is compressed and deformed from the free length, if the spring constant is small, the amount of deformation from the free length to the deformed state that provides the desired spring force increases, and from the middle of being lowered toward the working height range The coil spring begins to deform, and the lowering speed tends to be slow.

  Further, in recent years, in the combine, it has been desired to improve the maintainability of the inside of the machine body hidden by the cutting part such as the engine output part and around the transmission case, and the cutting part can be removed from the traveling body or the cutting part. A device that opens the periphery of the airframe that is concealed by the cutting part by, for example, opening and closing the vehicle laterally outward is also put into practical use. When trying to introduce such an open structure to a model with a cutting part configured to follow the ground, the connection between the cutting part lifting hydraulic cylinder and the cutting part is not only released, but a coil spring is attached. It is also necessary to release the connection between the support rod and the cutting part, and it is predicted that the operation for moving the cutting part becomes troublesome.

  The present invention has been made paying attention to such a point, and in a combined harvesting part lifting structure configured to raise and lower the harvesting part while following the ground, the weight load of the harvesting part is suitably balanced and supported. An object of the present invention is to make it possible to quickly lower the cutting part toward the working height range 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 supports the cutting part at the front part of the traveling machine body, the elastic balance mechanism is constituted by a coil spring arranged in a cantilever direction facing the front end part of the traveling machine body, The cutting part is configured to be separably supported by a receiving part provided at the front end part, and a spring force adjusting means for adjusting the initial compression state of the coil spring is provided.

  According to the above configuration, when the cutting part is greatly raised beyond the cutting work height range, the cutting part is moved away from the receiving part of the coil spring in the desired compression state, and the cutting part is lowered to the cutting work height range. Since the cutting part can be supported by contact via the receiving part only, the spring force of the coil spring does not act on the way of lowering toward the cutting work height range, and no lowering resistance is generated.

  Further, when the mowing part is moved greatly for maintenance, the mowing part can be moved while leaving the elastic balance mechanism in the traveling machine body without requiring a special connection release operation.

  By adjusting the initial compression state of the coil spring, it is possible to change and adjust the contact pressure when the cutting part is grounded by its own weight. When the farm scene is soft, the initial compression amount of the coil spring is increased to increase the spring force. As a result, the contact pressure can be reduced, and the amount of settlement of the cut portion can be reduced to follow the contact with the ground. Conversely, if the farm scene is hard, increase the ground pressure by reducing the initial compression amount of the coil spring and reducing the spring force so that the mowing part does not rise or fall sensitively to small irregularities in the farm scene. And can follow the ground stably.

  Therefore, according to the first invention, the weight load of the cutting part can be suitably balanced and supported, the cutting part can be quickly lowered toward the working height range, and the movement of the cutting part can be released. Can also be done easily.

According to a second invention, in the first invention,
The spring force adjusting means is provided at the front end of the elastic balance mechanism.

  According to the above configuration, the front end portion of the elastic balance mechanism can be exposed by largely moving and separating the cutting portion to the maintenance position, and the spring force can be easily adjusted from a wide working space.

According to a third invention, in the first or second invention,
The elastic balance mechanism is configured by sandwiching the coil spring between a spring receiving cup fixed to the machine body and a spring receiving cup arranged opposite to the spring receiving cup.

  According to the above configuration, the coil spring sandwiched between the front and rear spring receiving cups is always maintained in a predetermined posture without being unduly twisted, and a stable spring force is provided so that the cutting portion is suitably elastically supported. can do.

According to a fourth invention, in the third invention,
The initial compression state of the coil spring can be adjusted by adjusting the distance between the spring receiving cups.

  According to the above configuration, the initial compression state can be adjusted in a state where the coil spring is held between the front and rear spring receiving cups in a stable posture, and thereby the ground pressure can be adjusted with high accuracy.

A fifth invention is the invention according to any one of the first to fourth inventions,
The coil spring is covered with a mudguard cover.

  According to the above configuration, mud or straw scraps do not adhere and solidify on the outer periphery or inside of the coil spring, and a suitable elastic balance function can always be exhibited without hindering deformation of the coil spring.

  FIG. 1 shows a self-removing 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 of a single-acting type, 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 is a designation for the aircraft. In the front views of FIGS. 5 and 6, the designation and the left-right direction in the drawings are reversed.

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

  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 reaping part 3 configured as described above is supported so as to be capable of lateral movement and swing opening, and the structure thereof will be described in detail below.

  A cast turning bracket 31 that can turn around a longitudinal axis 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 revolving arm 32 having a sheet metal structure is extended from the bracket 31 toward the right direction (toward the body). The right bearing bracket 22 is placed on the upper surface of the extending end of the swivel arm 32, and is coupled to the right side of the base 18 by bolts 33.

  The swivel arm 32 is equipped with a cutting portion lateral movement mechanism 34. The mowing portion lateral movement mechanism 34 includes a swing support frame 35 in the form of a rectangular loop supported on the swing arm 32 so as to be swingable about a lateral fulcrum a, and a screw shaft supported horizontally on the swing support frame 35. 36, a movable piece 37 screwed onto the screw shaft 36, an electric motor 38 for driving the screw shaft mounted on the swing support frame 35, and the like. The connecting piece 35b provided in the portion 35a and the piston rod 12a of the hydraulic cylinder 12 are connected by a connecting pin 39 that can be inserted and removed. The connecting pin 39 is provided with a connecting plate 39a and a handle 39b. Usually, the connecting plate 39a is fastened and fixed to the connecting piece 35b by a bolt 40, so that the connecting state with the piston rod 12a is maintained. The connection between the cutting portion lateral movement mechanism 34 and the hydraulic cylinder 12 is released by removing the connecting pin 39 by removing 40.

  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 mowing part frame 17 is engaged from above without applying a load to the movable piece 37 above the mowing part frame receiving position by the swing support frame 35, and the screw shaft 36 is rotationally driven by the electric motor 38. Thus, the movable piece 37 is moved to the left and right by a screw feed, whereby 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 either one of the left and right stroke ends, and the mowing unit 3 is moved up to the left stroke end during the rotating mowing operation which is a normal mowing mode. To move the left end of the cutting part 3 to the left side of the left crawler travel device 1 stepping allowance. Moreover, at the time of the middle splitting work that cuts and harvests through the center of the field, the cutting unit 3 is moved to the right stroke end and is positioned within the width of the machine body. 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.

  As shown in FIGS. 14-17, the left outer side part of the cutting part 3 is equipped with the grain supply stand 45 used for pillow threshing work. The cereal supply table 45 is formed in a downward U-shape having a relatively large vertical cross-sectional shape and is raised on the back of the left pulling device 7 and also serves as a device support frame. It is mounted and supported by a pipe pulling drive case 46 provided through a support arm 47 so that it can swing up and down. This support arm 47 is formed by bending a round bar into a substantially L shape, and its horizontal shaft portion 47a is raised so that it can be moved laterally to a bracket 48 provided on the drive case 43 and is vertically moved around a lateral fulcrum c. It is inserted and supported so that it can swing. Then, the cereal supply table 45 is put on the support arm 47 from above and is bolted at two locations in the front and rear, and a guide rod 49 along the starting end of the feed chain 15 is connected to the lower end of the support arm 47. Then, the cedar supply table 45 swings downward with its own weight integrally with the support arm 47, so that the guide ridge 49 is placed on the start end of the feed chain 15 and the cereal supply that has been conveyed by the supply / conveyance device 11. The stock company is guided by the lower surface of the guide rod 49 and is smoothly run and supplied to the starting end of the feed chain 15.

  The cereal supply table 45 and the guide ridge 49 need to be held at a fixed position in the lateral direction with respect to the starting end of the feed chain 15 in order to perform the cereal guidance, and the structure for this is as follows: It is configured.

  As shown in FIG. 15, the support arm 47 is urged to move laterally outward by a coil spring 50 that is externally fitted to the horizontal shaft portion 47a. Also, the release wire 52 having the inner front end 52a (f) connected to the supply base mounting bracket 51 provided at the bent portion of the support arm 47 and the outer front end 52b (f) connected to the bracket 48 is moved laterally by the cutting part. It extends to the mechanism 34. The outer rear end 52b (r) of the release wire 52 is connected and fixed to a wire bracket 53 attached to the cutting portion frame 17, and the inner rear end 52a (r) is provided to the swing support frame 35. When the mowing part frame 17 moves to the left (laterally outward of the machine body), the inner wire 52a is relatively pulled out, and thereby the inner front end 52a (f) is located beside the mowing part 3. When the retraction operation is performed by the same amount as the movement amount, and conversely, when the cutting unit frame 17 moves laterally outward, the inner wire 52a is loosened by the same amount as the horizontal movement amount of the cutting unit 3.

  Therefore, when the cutting part 3 moving to the inside of the machine body is moved laterally outward, the support arm 47 is pulled against the coil spring 50 by the amount of the inner rear end 52a (r) being pulled out. On the contrary, when the cutting part 3 moving laterally outward is moved laterally inwardly, the support arm 47 has the spring force of the coil spring 50 as much as the inner rear end 52a (r) is loosened. As a result, the cereal supply table 45 and the support arm 47 are held at a fixed lateral position with respect to the feed chain 15 regardless of the lateral movement of the cutting unit 3. It will be.

  Moreover, when stopping the driving | running | working and stopping the drive of the cutting part 3 and performing a pillow threshing operation | work, it places on the supply conveyance apparatus 11 which has stopped the hand-cutted grain pestle, and the stockholder side is cereal. Temporarily placed on the straw supply table 45, and the grain meal that is grasped by an appropriate amount from the temporarily placed grain meal is moved to the rear of the grain meal supply table 42 and supplied to the feed chain 15 exposed at the rear of the supply table. It is.

  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, when the cutting part 3 is lowered by its own weight to the cutting work height range, the lower end lateral flange part 35a of the swing support frame 35 in the cutting part lateral movement mechanism 34 is provided at the lower part of the front end part of the traveling machine body 2. The elastic balance mechanism 61 is elastically contacted and supported by the front end.

  This elastic balance mechanism 61 is configured by arranging a coil spring 62, which is initially compressed at the front end of the main frame 16 constituting the traveling machine body 2, in a predetermined forward projecting posture, and is mounted on the main frame 16. A pair of front and rear spring receiving cups 64 are inserted into and attached to the support rod 63, and the coil spring 62 is sandwiched between the spring receiving cups 64, and a nut 65 attached to the front end of the support rod 63 is tightened. The initial compression amount of the coil spring 62 can be adjusted. Further, two bolts 66 are mounted over the flange portions 64a formed at diagonally diagonal positions of the two spring receiving cups 64, so that the posture of the two spring receiving cups 64 is stably maintained. It is designed to be maintained in the directional orientation. Further, a receiving plate 67 is provided on the front surface of the front spring receiving cup 64 and is fastened and connected by the bolt 66, and this receiving plate 67 supports the lower end lateral flange portion 35 a of the swing support frame 35 in contact. It is configured to

  The initial compressive load of the elastic balance mechanism 61 configured in this way is adjusted in advance using the adjusting means so as to be a value somewhat smaller than the weight of the cutting portion 3, and the lower end side of the swing support frame 35 is adjusted. The part 35a is compressed and deformed by contact and support, and a part of the weight of the cutting part 3 is offset by the spring force of the elastic balance mechanism 61, and the hook-shaped grounding body 68 provided in the lower front part of the cutting part 3 is compared. It is designed to touch the field scene with a small ground pressure. 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. A constant cutting height is maintained by following the ground. A rubber mudguard cover 69 is wound around the coil spring 62 in the elastic balance mechanism 61 to prevent foreign substances such as mud from adhering to and entering the elastic balance mechanism 61.

  The grounding body 68 is made of a sheet metal material having a tapered planar shape and a cross-sectional shape formed in a boat shape, and is welded and fixed to support rods 72 of three dividers 71 arranged at the front end of the cutting part 3. . Further, the rear portion of the grounding body 68 extends to a lower part of the pipe weeding frame 73 that plugs and connects the support 762, and the ground pressure acting on the grounding body 68 is also directly supported by the weeding frame 73. It is like that.

  Further, the cutting unit 3 configured as described above can swing and swing leftward and outward for inspection and maintenance. That is, when the bolt 33 that connects the free end portion of the right bearing bracket 22 and the swivel arm 32 to the base 18 is removed, the swivel arm 32 and the swivel bracket 31 can pivot about the vertical fulcrum X integrally. The cutting unit 3 supported by the turning arm 32 can turn together with the cutting unit lateral movement mechanism 34.

  An operating rod 81 is inserted into and supported by the bearing bracket 21 so as to be slidable laterally, and a block member 82 for lowering locking is connected to the right side through end of the operating rod 81. A left end portion of the operation rod 81 is extended laterally outward of the machine body, and an operation knob 83 is attached to the operation rod 81 so that the operation rod 81 can be pushed and pulled from the laterally outer side of the machine body. Normally, the operating rod 81 is pushed into the body, and the block member 82 is in the unlocked position released from the turning bracket 31 to the right.

  In order to turn the mowing part 3 forward from the normal harvesting position toward the front, as shown in FIG. 3, in order to turn to the left lateral outer side of the aircraft, first, the mowing part 3 is raised to a predetermined height or more. Move to the left stroke end. Next, the operating rod 81 is pulled out to the left outside of the machine body, and the block member 82 is moved from the unlocked position to the lowered lock position where the block member 82 rides on the turning bracket 31. Next, the cutting member 3 is lowered (down its own weight), and the block member 82 is sandwiched between the fitting 84 connected and fixed to the base of the cutting unit framing 17 and the upper surface of the free end portion of the swivel bracket 31. Further, the cutting unit 3 is prevented from being lowered. Thus, in a state where the lowering is prevented through the block member 82, the cutting unit 3 is held at a height slightly raised from the ground.

  Next, the connection pin 29 that connected the cutting unit frame 7 and the piston rod 9a of the hydraulic cylinder 9 is pulled out to release the connection, and the free end portions of the right bearing bracket 22 and the swing arm 32 are mounted on the base. Remove the bolt 33 that was connected to 8. As a result, the cutting part 3 can be rocked and released about the longitudinal axis X while being slightly lifted from the ground.

  In the state where the cutting part 3 is not moved to the left stroke end, the fitting 84 is disengaged from the turning bracket 31 in the right lateral direction, and the lowering lock is performed via the lock member 82 as described above. In other words, the cutting and opening operation of the cutting unit 3 cannot be performed.

  Prior to the turning opening operation of the cutting part 3, the cereal supply table 45 is swung up and swung around the fulcrum c at the front end together with the support arm 47 so as to switch to the upright retracted posture so as not to fall backward. At the same time, the weed ridge 75 arranged so as to be able to swing up and down is removed from the left outer side which is the uncut side of the cutting unit 3.

  As shown in FIGS. 18 and 21, a rearward fulcrum pin 76 is provided at the tip of the weed ridge 75, and is inserted into and supported by a support fitting 77 provided on the back of the left end divider 71 so as to be detachable from the front. . Further, a base end rotation arm 78 is provided at a lower left portion of the cutting part 3 so as to be rotatable around the longitudinal axis d passing through the fulcrum pin 76 and capable of friction holding, and is integrated with the front and rear middle of the weed ridge 75. The equipped intermediate support arm 75 a is detachably connected to the base end rotation arm 78 via a connection pin 79. Then, by removing the retaining pin 80 attached to the fulcrum pin 76 and the connecting pin 79, the weed pod can be removed from the cutting portion 3.

  [Other Examples]

  (1) In the elastic balance mechanism 61 of the above embodiment, as a spring force adjusting means for adjusting the initial compression state of the coil spring 62, a mode in which a shim plate is inserted and removed to adjust the distance between the spring receiving cups 64 is used. You can also.

  (2) The front spring receiving cup 64b itself may be a receiving portion that supports the cutting portion 3 in contact.

Side view of self-removing combine Top view of self-removing combine Plan view showing mowing part opening operation Side view showing the base in the cutting 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 Side view showing the mowing part lateral movement mechanism Longitudinal front view of hydraulic cylinder connection Side view showing the cereal supply part of the threshing device The top view which shows the grain supply stand of the state where the cutting part was moved to the right side of the body The top view which shows the grain supply stand of the state where the cutting part was moved to the left of the machine Longitudinal front view of grain supply stand Side view showing the grounding part of the cutting part Plan view showing the grounding part of the cutting part Longitudinal front view of grounding body Partially cutaway plan view showing the weed ridge support structure

Explanation of symbols

2 traveling machine body 3 cutting part 61 elastic balance mechanism 62 coil spring 64a spring receiving cup 64b spring receiving cup 69 mudguard cover

Claims (5)

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 supports the cutting part at the front part of the traveling machine body, the elastic balance mechanism is constituted by a coil spring arranged in a cantilever direction facing the front end part of the traveling machine body, The harvesting part of the combine characterized in that it is configured so that the cutting part is detachably abutted and supported by a receiving part provided at the front end part, and is provided with a spring force adjusting means for adjusting the initial compression state of the coil spring. Elevating structure.   2. The combine harvester lifting structure according to claim 1, wherein the spring force adjusting means is provided at a front end of the elastic balance mechanism.   The harvesting of the combine according to claim 1 or 2, wherein the elastic balance mechanism is configured by sandwiching the coil spring between a spring receiving cup fixed to the machine body and a spring receiving cup arranged opposite to the spring receiving cup. Part lifting structure.   The combine mowing part raising / lowering structure of Claim 3 comprised so that adjustment of the space | interval of the said both spring receiving cups and adjustment of the initial compression state of the said coil spring was possible.   The combine mowing part raising / lowering structure according to any one of claims 1 to 4, wherein the coil spring is covered with a mudguard cover.

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