JP2008193909A - Threshing depth adjustment structure of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the threshing depth adjustment structure of a combine harvester, which surely stops a tension bracket that supports the tension wheel of a plant foot nipping and conveying apparatus from rotating and smoothly, and conveys grain culms in a proper manner. <P>SOLUTION: A nipping rail in the plant foot nipping and conveying apparatus 31 is attached to the free end part of a rail support arm 47, arranged to bypass a grain culm movement pathway and a flat plate-like fixing plate 48 connectably installed at the base part of the rail support arm 47 is connected to the conveying frame 34 of the plant foot nipping and conveying apparatus. The tension bracket 38 supporting the tension wheel 35 slid and guided on the flat surface of the fixing plate 48 in a surface contact state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combine depth adjustment structure.

In a self-detaching combine, a stock holding and conveying device that conveys the harvested cereal toward the feed chain is swung around the end on the drive side, so that the cereal is delivered to the feed chain. A combination depth adjustment structure configured to change the sandwiching position in the cocoon length direction is provided (see, for example, Patent Document 1).
JP 2006-55086 A [paragraph (0013)]

For example, as shown in FIG. 12, the stock holding and conveying device for adjusting the handling depth includes a conveying chain 36 with a protrusion wound around a drive sprocket (not shown) and a tension wheel 35, It is composed of a clamping rail (not shown) arranged to face the conveyance path of the conveyance chain 36. A tension bracket 38 that supports a tension ring 35 so as to freely rotate is supported on a free end side of a transport frame 34 that is configured to be swingable about the axis of the drive sprocket as a fulcrum. A rail support rod 47 bent around the path is extended from the conveyance frame 34, and a holding rail is mounted and supported on the free end side of the rail support rod 47.
Conventionally, the support rod 39 and the anti-rotation pin 50 are extended in parallel from the tension bracket 38, and the support rod 39 and the anti-rotation pin 50 are slidably inserted into the support fitting 51 provided on the transport frame 34, thereby providing the tension. A detent structure that prevents the bracket 38 from rotating around the support rod 39 has been adopted.

  According to the structure described above, for example, as shown in FIG. 12, the tension bracket 38 is prevented from rotating around the support rod 39 due to the engagement between the detent pin 50 and the support fitting 51. The stress concentrates on the engagement point with the metal fitting 51, and the support hole provided in the support metal fitting 51 is crushed or deformed during long-term use, and the rotation of the tension bracket 38 is not prevented. There was a risk that the tension bracket 38 would rattle during conveyance and an abnormal noise would be produced during conveyance, or the conveyance chain 36 would vibrate and deteriorate the conveying posture of the cereal.

  The present invention has been made paying attention to such a point, and it is an object of the present invention to ensure that the tension bracket is prevented from being rotated and to carry the cereals smoothly and satisfactorily.

The first aspect of the present invention is a stock chain holding and transporting device for adjusting a handling depth, a transport chain wound around a drive sprocket and a tension wheel, and a sandwiching rail provided facing the transport chain. And a tension bracket on which the tension ring is supported is slidably supported in the chain tension direction on the free end side of the transport frame supported to be swingable about the axis of the drive sprocket as a fulcrum. In the combined depth adjustment structure of the combine in which the rail support arm bent around the moving path is extended from the transport frame, and the holding rail is mounted and supported on the free end of the rail support arm,
A flat plate-like mounting plate connected to the base of the rail support arm is connected to the transport frame, and the tension bracket is slidably guided in a surface contact state on a flat surface of the mounting plate. .

  According to the above configuration, the rotation around the axis along the sliding direction acting on the tension bracket is prevented by surface contact with the flat surface of the mounting plate, and even if repeated turning power is applied, Therefore, the tension bracket is stably held in the desired posture for a long period of time.

  Therefore, according to the first invention, the posture of the tension wheel supported by the tension bracket is stabilized, so that the posture of the transport chain wound around the tension wheel is also stabilized, and the abnormal noise caused by the wobbling of the tension wheel and the transport chain. It is possible to suppress turbulence and conveyance disturbance and to carry out smooth and good cereal conveyance over a long period of time.

  By using the flat surface of the mounting plate connected to the base of the rail support arm as a sliding contact surface that stabilizes the posture of the tension bracket, a dedicated member for preventing the tension bracket from rotating becomes unnecessary. Effective for simplification of structure and cost reduction.

According to a second invention, in the first invention,
The stock holding and conveying apparatus is configured to be swingable with the shaft center of a driving sprocket arranged in a good conveyance as a fulcrum.

  According to the above configuration, the posture on the terminal end side of the tension wheel and the transport chain is stabilized, so that the posture on the transport terminal side of the culm that has been sandwiched and transported is stabilized, and the stock holding and transporting device and the next transport In the delivery of cereals to and from the apparatus, it is difficult for cereals to fall out or to be delivered poorly.

  FIG. 1 shows a side view of the front portion of the self-removing combine. The self-decomposing combine is configured such that a cutting unit 3 having a six-row cutting specification is connected to a front part of a traveling machine body 2 including a pair of left and right crawler traveling devices 1 so as to be movable up and down, and a driving unit 4 and a threshing are connected to the traveling machine body 2. The apparatus 5 and the grain collection tank 6 with an unloader are mounted.

  The crawler traveling device 1 includes a crawler belt 11 across a driving sprocket 7 at the front end, a tension wheel 9 provided at the rear end of the track frame 8, and a plurality of wheels 10 provided on the track frame 8 so as to be freely rotatable. It is composed by winding. As shown in FIG. 11, the roller 10 basically includes an outer ring portion 10 a that engages with a pair of left and right core metal protrusions 12 protruding from the inner peripheral surface of the crawler belt 11 from the lateral outer side. An inner ring portion 10b that is configured as an outer ring and that engages between the core metal projections 12 is provided between the outer ring portions 10a, and a dedicated anti-rollout prevention that engages between the core metal projections 12 is provided. The member is configured to exhibit the function of preventing the wheel from being removed without being attached to the track frame 8.

  As shown in FIGS. 9 and 10, the grain recovery tank 6 includes a box-shaped tank body 6 a and an increase tank that is mounted on the lateral outer surface of the tank body 6 a so as to be able to move back and forth around the lower fulcrum x. 6b. The upper edge 6c of the increasing tank 6b is formed in an arc shape centered on the lower fulcrum x, and the engagement holes 13 are formed at a constant small pitch along the circumferential direction of the arc. By rotating the pinion gear 14 meshing with the bore 13 in the forward and reverse directions by an electric motor (not shown), the increase tank 6b can be switched between the extended position and the retracted position.

  A wire 15 is stretched between the inner surface of the front wall of the increasing tank 6b and the inner surface of the front wall of the tank body 6a, and bends and stretches between the outer surface of the rear wall of the increasing tank 6b and the outer surface of the rear wall of the tank body 6a. A link 16 is attached. When the increase tank 6b is extended outward and oscillated, the wire 15 is tensioned, and the bending / extension link 16 is extended to the limit, whereby the maximum extension position of the increase tank 6b is regulated. The meshing hole 13 and the pinion gear 14 are disengaged by an outward force caused by the weight of the grain stored in the tank 6b, and the increase tank 6b swings outward beyond the limit position and deforms. Is to be prevented.

  As shown in FIG. 1, the mowing unit 3 is provided with a cylindrical mowing unit frame 21 that also serves as a transmission case in a forward-lowering inclined posture, and the rear end base of the mowing unit frame 21 is a traveling machine body. 2 is connected to and supported by a support stand 22 erected at the front of 2 so as to be able to swing up and down around a horizontal fulcrum P, and is driven to swing up and down by a hydraulic cylinder 23. The mowing unit frame 21 has six pulling devices 24 that cause the planted culm to a predetermined trimming posture, a clipper-type mowing device 25 that cuts the planted culm that has been caused, and the pulling culm for each item. Auxiliary conveyor belt 26 that is lightly scraped backwards, a rotary packer 27 that scrapes and transports the roots of the harvested cereals for each line, and supports the stock side and the tip side of the harvested cereals within the cutting width. A merging / conveying device 28 that merges with the intermediate part, a supply / conveying device 29 that conveys the merged cereal to the start end of the feed chain 17 provided on the lateral outer side of the threshing device 5, and the like are provided.

  As shown in FIG. 3, the main transmission shaft 55 is inserted into the proximal end boss portion 21 a of the cutting unit frame 21 concentrically with the lateral fulcrum P, and the right end of the main transmission shaft 55 is connected to the PTO shaft 57 of the transmission case 56. While being interlocked with the belt, the transmission shaft 60 and the main transmission shaft 55 inserted and supported by the cutting unit frame 21 are interlocked with the bevel gear. The transmission case 59 that drives the crawler traveling device 1 is connected to a main transmission 59 composed of a hydrostatic continuously variable transmission linked to a belt of an engine 58, and forward or reverse rotation from the main transmission 59 is performed. The transmission power is gear-shifted in a plurality of stages by the transmission case 56 and transmitted to the left and right crawler travel devices 1 so that the forward / reverse movement can be performed by continuously variable transmission.

  An output pulley 61 is attached to the outer end of the PTO shaft 57 driven by the output from the main transmission 59, and only the forward rotation power of the PTO shaft 57 is provided by a one-way clutch 62 incorporated in the output pulley 61. Is transmitted to the main transmission shaft 55 and transmitted to each part of the cutting unit 3 through the cutting unit frame 21, and the pulling unit 24, the cutting unit 25, the auxiliary conveying belt 26, the rotary packer 27, the merging conveying unit 28, The supply conveyance device 29 and the relay conveyance device 32 are driven at a speed synchronized with the traveling speed.

  The detailed structure of the one-way clutch 62 is shown in FIGS. The one-way clutch 62 is configured as a ratchet type, and includes a driving-side inner ring 63 that is key-connected to the PTO shaft 57, and a driven-side outer ring that is fitted on the inner ring 63 via a bearing 64 so as to be freely rotatable. Pulley boss 61a, a pair of ratchet pawls 66 arranged at diagonal positions inside the pulley boss 61a and supported by support pins 65, and equipped to swing and urge the ratchet pawls 66 in a direction in which the toe heads toward the inner ring 63. The torsion spring 67 is configured.

  A pair of inclined notches 68 are formed at diagonal positions on the outer peripheral surface of the inner ring 63, and when the PTO shaft 57 rotates in the forward rotation direction a, as shown in FIG. By engaging with the inside of the inclined notch 68, the forward rotational power of the inner ring 63 is transmitted to the pulley boss 61a via the ratchet pawl 66. When the PTO shaft 57 rotates in the reverse rotation direction b, the claw tip of the ratchet claw 66 is pushed out to the outer periphery of the inner ring by the inclined surface of the inclined notch 68, so that the inner ring 63 idles in the reverse rotation direction b with respect to the pulley boss 61a. The rotational power in the reverse direction of the shaft 57 is not transmitted to the output pulley 61.

  The outer periphery of the base end portion of the ratchet claw 66 is formed in a circular shape and is engaged with a circular recess 69 formed in the pulley boss 61a. The ratchet claw 66 is slidably rotated around the center of curvature of the circular recess 69 as a fulcrum. Supported to move. The support pin 65 is driven and fixed inside the pulley boss 61 a at the center of curvature of the circular recess 69, and the base of the ratchet claw 66 is loosely inserted into the support pin 65 so that the ratchet claw 66 is detached from the circular recess 69. Absent. During power transmission, a power transmission load is received by surface contact between the outer periphery of the proximal end of the ratchet claw 66 and the circular recess 69, and the power transmission load acts on the support pin 65 into which the ratchet claw 66 is loosely inserted. In other words, the support pin 65 has a small diameter having a strength sufficient for positioning the ratchet pawl 65.

  As shown in FIG. 2, the supply and transport device 29 includes a tip locking transport device 30 that extends near the front of the feed chain 17, and a stock holding and transport device 31 that extends rearward from the grain merging point. And a horizontal turning type relay conveyance device 32 arranged in front of the feed chain 17, and the cereals in a standing posture merged by the merging conveyance device 28 are received by the starting end portion of the supply conveyance device 29. While being conveyed rearward and upward, the cereals are changed to a sideways posture and delivered to the starting end of the feed chain 17.

  The stock holding and conveying device 31 changes the conveying end position by swinging up and down around the front fulcrum y, thereby changing the grain passing position to the feed chain 17 in the cocoon length direction, A function of changing and adjusting the length of the culm insertion into the threshing device 5, that is, a so-called handling depth adjustment function is provided.

  As shown in FIGS. 4 and 5, the stock holding and conveying device 31 includes a drive sprocket 33 that is pivotally supported concentrically with the fulcrum y at the front and rear intermediate portions of the cutting part frame 21, and the shaft center (fulcrum of the drive sprocket 33. y) a transport frame 34 supported swingably around the center, a tension wheel 35 provided at the rear of the transport frame 34, a drive sprocket 33 and a transport chain with protrusions wound around the tension wheel 35. 36 and a sandwiching rail 37 arranged opposite to each other in the conveyance path portion of the conveyance chain 36.

  The tension ring 35 is pivotally supported by a tension bracket 38 formed by bending a flat plate material into a U-shape, and a support rod 39 projecting forward from the tension bracket 38 has a rear end portion of the transport frame 34. Is inserted and supported by the support portion 40 provided so as to be slidable back and forth. The tension spring 41 externally fitted to the support rod 39 applies a rearward slide biasing force to the tension bracket 38, whereby the transport chain 36 is tensioned with an appropriate tension.

  A wrapping prevention plate 42 that covers the end rotation part of the transport chain 34 is fixed on the upper and lower outer surfaces of the tension bracket 38 so that the transported cereals are caught by the transport chain 34 and caught. And is configured to be smoothly separated from the transport chain 36.

  The holding rail 37 is connected to a support rod 46 mounted on the rail base 45 so as to be displaceable in the perspective direction with respect to the transport chain 36, and the support rod 46 is directed toward the transport chain 36 by a spring 18 incorporated in the rail base 45. The squeeze is urged so that the sandwiching rail 37 approaches the transport chain 36, so that the culm is elastically sandwiched between the transport chain 36 and the sandwiching rail 37. ing.

  The rail base 45 is attached to a tip end portion of a rail support arm 47 extending from the rear portion of the transport frame 34. The rail support arm 47 is formed by bending a round pipe material into a substantially U shape so as to circumvent the moving path on the stockholder side of the transporting cereal and is welded to the base end of the rail support arm 47. A fixed flat plate mounting plate 48 is connected and fixed to the rear portion of the transport frame 34 via the support portion 40.

  The mounting plate 48 is arranged in parallel with the sliding direction of the tension bracket 38, and the lower wrapping prevention plate 42 is supported in surface contact with the upwardly flat surface of the mounting plate 48 so that the tension bracket 38 is in surface contact state. The tension bracket 38 is prevented from rotating around the support rod 39 by being guided in sliding contact.

[Other Examples]
(1) When the tension bracket 38 itself is formed in the shape of the anti-roll plate 42, the downward outer surface of the tension bracket 38 may be slidably guided in a surface contact state directly to the upward flat surface of the mounting plate 48. .
(2) In the above embodiment, the stock holding and transporting device 31 is exemplified as a handling depth adjusting structure that swings around the front fulcrum y. However, the stock holding is performed around the fulcrum on the rear end of the transport. The present invention can also be applied to a handling depth adjusting structure having a specification for swinging the transport device 31.

Combine side view Plan view showing the grain haul transport structure of the cutting part Schematic diagram showing the transmission system Top view showing the rear part of the stock holding and conveying device Side view showing the rear part of the stock holding and conveying device Side view of rear part of stock holding and conveying device Longitudinal side view of one-way clutch Longitudinal front view of one-way clutch Rear view of grain collection tank Perspective view of grain recovery tank Front view showing wheels of crawler traveling device Side view showing the rear part of a conventional stock holding and conveying apparatus

Explanation of symbols

31 Stock holding and conveying device 33 Drive sprocket 34 Conveying frame 35 Tension ring 36 Conveying chain 37 Holding rail 38 Tension bracket 47 Rail support arm 48 Mounting plate y Support point

Claims (2)

The stockholder holding and conveying device for adjusting the handling depth is constituted by a conveying chain wound around the drive sprocket and the tension wheel, and a holding rail arranged opposite to the conveying chain, A tension bracket that supports the tension ring is slidably supported in the chain tension direction on the free end side of the transport frame that is swingably supported with the shaft center of the drive sprocket as a fulcrum, bypassing the grain movement path In the combined depth adjustment structure of the combine in which the bent rail support arm is extended from the transport frame, and the holding rail is mounted and supported on the free end of the rail support arm.
A flat plate-like mounting plate connected to the base of the rail support arm is connected to the transport frame, and the tension bracket is slidably guided in a surface contact state on a flat surface of the mounting plate. Combine depth adjustment structure.   2. The combine handling depth adjusting structure according to claim 1, wherein the stock holding and conveying device is configured to be swingable about a shaft center of a drive sprocket provided at a good conveyance.

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