JP4063855B2 - Combine harvester lifting structure - Google Patents

Description

  The present invention relates to a structure for supporting a harvesting part of a self-removing combine in which a harvesting unit including a pulling device, a harvesting device, and a harvested culm conveying device is connected to a front part of a traveling machine body so as to be movable up and down.

In recent years, the mainstream of the combine is a so-called automatic cutting height control device configured to automatically move the cutting part up and down to follow the field scene, and the ultrasonic sensor measures the height of the cutting part to the ground. , And a means for controlling an electromagnetic control valve that controls the operation of the lifting cylinder based on the detection information is employed (see, for example, Patent Document 1). Further, it has been conventionally known that the ground height detection device is configured as a grounding type that detects a vertical swing displacement of a grounding sensor that follows the grounding with a rotary potentiometer.
JP 2001-275433 A

  A combine equipped with an automatic cutting height control device can perform harvesting and harvesting operations at a stable cutting height, but requires expensive equipment to construct an automatic cutting height control device. In the combine, the cost ratio occupied by the control device is large, and as a whole, the machine is inevitably expensive. For this reason, commercialization of an inexpensive combine that can perform a harvesting operation at a stable cutting height without providing an expensive automatic cutting height control device is desired among small-sized users.

  The present invention has been made paying attention to such a situation, and the harvesting part raising and lowering structure of the combine that can perform harvesting work at a relatively stable cutting height without providing an automatic cutting height control device. The purpose is to provide.

A feature of the present invention is a harvesting part raising / lowering structure for a combine harvester that includes a raising device, a harvesting device, and a harvesting cereal conveyance device connected to a front part of a traveling machine body so as to be able to be raised and lowered.
A plurality of grounding bodies for supporting a grounding load are provided at the lower part of the cutting part,
Among the plurality of grounding bodies, the grounding body attached to the hook-shaped support member provided at the end of the cut portion of the cutting part is not projected from the support member to the already cut side. The grounding area of the grounding body on the already-cutting side is set to be larger than the grounding area of the other grounding bodies .

  According to the above configuration, when the cutting part is grounded and tracked by its own weight during the harvesting and harvesting operation, the cutting part is received and supported with good stability on the field scene via the grounding body having a large grounding area. Therefore, even in a soft field, the cutting part can be grounded and tracked with a small amount of settlement.

  In addition, the grounding body has a crop on the uncut side, so that the overhang from the support member to the uncut side is restricted by the crop, while the crop does not exist on the cut side. The projecting from the support member to the already cut side is effectively utilized so that the projecting amount from the support member to the already cut side is increased. As a result, when the cutting part is grounded and tracked by its own weight during the harvesting and harvesting operation, the grounding body can be stably grounded with a large grounding area as much as possible, and the cropping by the grounding body can be avoided.

  Therefore, without providing an expensive automatic cutting height control device, the cutting portion can be grounded with good stability, and the cutting and harvesting operation can be performed at a stable cutting height.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an overall side view of a self-removing combine. This combine is connected to a front part of a traveling machine body 2 that travels with a pair of left and right crawler traveling devices 1 so that a cutting part 3 can be swung up and down around a fulcrum P above the rear part, and the right side of the traveling machine body 2 The operation part 4 provided with the driving part is arranged in the first half part, and the threshing device 5 is mounted on the left side of the traveling machine body 2, and the harvested grain is stored in the second right part of the traveling machine body 2. It has a structure in which a grain tank 6 is provided.

  The cutting part 3 in this example is configured to have a two-row cutting specification and cuts a pair of left and right pulling devices 7 that raise the planted culm to a predetermined standing posture, and the root part of the raised culm. The clipper-type mowing device 8, the rotary packer 9 that joins the two chopped cereals to the middle part of the cutting width, the stock side of the joined chopped cereals, sandwiched and conveyed rearward and upward, the threshing The harvested cereal conveyor device 11 and the like which are fed in a sideways posture to the feed chain 10 provided on the left outer surface of the device 5 are connected to the front portion of the traveling machine body 2 so as to be swingable up and down around the fulcrum P. It is configured to be mounted on the trimmed main frame 12 made.

  As shown in FIG. 8 and FIG. 9, the harvesting part main frame 12 is made of pipe material, and its base end part swings up and down around the fulcrum P on a support base 13 erected at the front part of the traveling machine body 2. It is supported so as to be movable and movable left and right along the fulcrum P. The support base 13 is provided with an arch-shaped support arm 15 that is swing-operated around a horizontal fulcrum a by a hydraulic cylinder 14. The mowing part main frame 12 receives and supports the free end of the support arm 15. Has been.

  Further, a screw shaft 17 that is driven forward / reversely by an electric motor 16 with a speed reducer is horizontally supported on the support arm 15, and a movable member 18 that is screw-driven to the left and right by the screw shaft 17 is trimmed. The main part frame 12 is engaged, and the cutting part main frame 12 is repositioned right and left by forward and reverse rotation of the screw shaft 17. In other words, the combine is configured so that the cutting unit 3 can be laterally slid with respect to the traveling machine body 2 to change the position, and during normal harvesting operations where the left side of the machine body is uncut and the harvesting operation is performed, the cutting unit 3 is used. By moving to the left limit of the lateral movement range, the mowing unit 3 is protruded to the uncutting side (left side) with respect to the crawler traveling device 1, and the mud discharged to the uncut side by the passage of the left crawler traveling device 1 It is avoided in advance that the crops are raised by raising the stock of uncut crops, or that the cutting device 8 enters the raised mud in the next cutting process. Further, at the time of the middle splitting operation that cuts through the middle of the field, the cutting unit 3 is moved to the right limit of the lateral movement range, and the cutting unit 3 is positioned within the lateral width of the left and right crawler traveling devices 1, so that the crawler traveling device 1. Cut and run without stepping over the crop.

  The cutting part main frame 12 is also used for a simplified model in which the cutting part 3 does not slide sideways. When used for a model having this specification, as shown in FIG. A structure in which the fulcrum fitting 52 is bolted to the bracket 51 fixed to the cutting part main frame 12 and the screw feeding type telescopic drive mechanism 53 is connected to the fulcrum fitting 52 to drive the cutting part 3 up and down. Is configured. Moreover, in the model of the specification which carries out the horizontal slide of the cutting part 3 as mentioned above, when a fulcrum bracket moves sideways, it will interfere with another apparatus, Therefore As shown in FIG. 14 (A), a fulcrum bracket is not attached to a bracket. Use it in a state.

  A compression coil spring 19 is attached to the hydraulic cylinder 14 that moves up and down the mowing unit 3, and when the mowing unit 3 is lowered to the mowing work height range as shown in FIG. The weight of the cutting part 3 acts on the compression coil spring 19 through the contact member 20 that is externally fitted to the hydraulic coil 14, and the load acting on the hydraulic cylinder 14 is reduced. Further, as shown in FIG. Is raised from the cutting work height range, the contact member 20 is separated from the compression coil spring 19, and the compression coil spring 19 stands by in an initial compression state.

  As shown in FIG. 2, three frame rods 21 made of a round pipe material are connected to the tip of the cutting portion main frame 12 in a fork shape, and left and right at the front of the frame rods 21 at both left and right ends. The lower portion of the pulling device 7 is connected and supported via a stay 22, and the cutting device 8, the rotary packer 9, and the like are supported by these frame rods 21. A divider support rod 23 is detachably inserted and connected to the front end of each frame rod 21.

  As shown in FIG. 3, the divider support rod 23 is made of a round pipe material having a diameter fitted into the frame rod 21, and the divider 24 is mounted on the flattened front end portion 23a so as to be adjustable in height and angle. Yes. The front end of a steel plate grounding body 25 is welded and fixed to the lower part of the divider support rod 23, and a connecting metal fitting 26 is provided to connect the divider support rod 23 and the front and rear intermediate portions of the grounding body 25. The divider support rod 23 is fixed to the frame rod 21 in a predetermined posture by joining the bolt 26 to a connecting metal fitting 27 provided at the front end of the frame rod 21 and bolting and connecting them.

  As shown in FIG. 6, the grounding body 25 has a vertical cross-sectional shape bent into a U shape, and is pressed into a boat shape with the lower surfaces of the front end portion and the rear end portion raised, The rear end of the U-shaped cross section of the body 25 is engaged with the frame rod 21 from below. By doing in this way, the grounding load acting on the long grounding body 25 before and after being extended from the divider support rod 23 to the rear cantilever state is surely supported by the divider support rod 23 and the frame rod 21, and also in the grounding state. It is configured so that it can sufficiently withstand a lateral load acting on the grounding body 25 when the aircraft is steered without any change. In addition, the left grounding body 25 provided on the unsupported divider support rod 23 passes between the uncut crop and the crop that is raised and cut, and the center grounding body 25 is raised and cut. Since it passes between the crops, as shown in FIG. 5, the same specification with a narrow width is used, and on the other hand, the right side of the right grounding body 25 is already cut and cut. As shown in FIG. 7, a wide specification projecting to the right side without crops is used, and the ground contact area of the ground contact body as a whole is secured as much as possible.

  FIG. 13 shows a hydraulic circuit for operation in the hydraulic cylinder 14 for raising and lowering the cutting part. The hydraulic cylinder 14 is a single-acting type, and is connected via a slow return valve 32 to a three-position switching type control valve 31 that is switched by an operating lever 30 provided in the operating unit 4. The control valve 31 is a “neutral” position that prevents oil draining from the hydraulic cylinder 14 and can fix the cutting unit 3 at an arbitrary height position. The control valve 31 supplies pressure oil to the hydraulic cylinder 14 to drive the cutting unit 3 upward. The position can be switched between the “up” position and the “down” position where the oil removal from the hydraulic cylinder 14 is allowed and the cutting unit 3 is lowered by its own weight.

  As shown in FIG. 11, the operation lever 30 is supported by a fulcrum bracket 33 so as to be able to swing back and forth around the fulcrum b, and corresponds to the “neutral”, “lift”, and The operation position can be switched to each of the “down” operation positions, and is returned to “neutral” by the torsion spring 34 provided at the lever fulcrum b. The torsion spring 34 has a free pin 34a, 34b at the front and rear thereof, and a fixing pin 35 provided on the fulcrum bracket 33 and an operating pin 36 provided on the operation lever 30 are sandwiched from the front and rear to make the operation lever 30 "neutral". By holding the operating lever 30 from “neutral” to “up” or “down”, one of the free ends 34a, 34b of the torsion spring 34 is fixed as a fixed end supported by a fixing pin 35. In addition to functioning, the other functions as a movable end that is pressed and moved by the operating pin 36, and provides a neutral return biasing force in any of the front and rear directions with a single spring.

  Further, in front of the “down” position of the operation lever 30, a “ground cutting” position is set in which the control valve 31 continues to be switched to the “down” state, and the operation lever 30 is engaged at this operation position. A lever lock mechanism 37 for stopping and holding is provided.

  As shown in FIG. 12, the lever lock mechanism 37 is provided with a fan-shaped lock plate 38 fixed to the base of the operation lever 30, and can be swung back and forth around the fulcrum c, and on the outer periphery of the lock plate by a spring 39. The lock arm 40 is oscillated and biased toward the lock arm 40, and the lock pin 41 provided on the lock arm 40 is engaged with the protrusion 42 provided on the outer periphery of the lock plate 38 so as to provide a lock function. It has become. That is, the lock pin 41 acts on the arc-shaped outer periphery of the lock plate 38 in the up / down operation range from the “up” position to the “down” position, and the operation lever 30 is operated by the neutral return machine by the torsion spring 34. Will return to neutrality. When the operating lever 30 is moved beyond the “down” position to the “ground cutting” position, as shown in FIG. 12 (a), the protrusion 42 on the outer periphery of the lock plate climbs over the lock pin 41 and twists. The return biasing force by the spring 34 prevents the lock plate 38 from swinging to the neutral side beyond the lock pin 41, and the operation lever 30 is held in the “ground cutting” position.

  Since the state in which the operation lever 30 is held at the “ground cutting” position is in a freely moving up and down state, the cutting unit 3 can be lowered by its own weight to the mechanical lower limit, but as described above, the cutting unit 3 includes the grounding body. 25, and the hydraulic cylinder 14 is equipped with a compression coil spring 19 for reducing the load. Therefore, the cutting unit 3 is lowered until the grounding body 25 is grounded with a ground pressure balanced with its own weight and spring biasing force. Thereafter, the cutting unit 3 moves up and down following ground contact with the ups and downs of the farm scene. Thereby, the ground height of the cutting unit 3 is maintained substantially constant without performing special lifting control, and cutting harvesting at a stable cutting height can be performed. Further, the function of preventing the divider 24 from entering the raised portion of the field is also exhibited.

Combine side view Top view of the cutting part Exploded side view of divider attachment Side view of divider attachment Longitudinal side view (b) and plan view (b) of unground and center grounding bodies Aa sectional view (a) and bb sectional view (b) in FIG. Longitudinal side view (b) and plan view (b) of grounded body on the already-cutted side Side view of the lifting part lifting structure Top view of the lifting part lifting structure Side view (a) in the lowered state and side view in the raised state (b) Side view of the operating lever for raising and lowering the cutting part Side view showing each operation state of the operating lever for raising and lowering the cutting part Hydraulic circuit diagram for raising and lowering the cutting part Side view of the main frame at the cutting part

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Traveling machine body 3 Mowing part 7 Pulling-up apparatus 8 Mowing apparatus 11 Mowing grain feeder 21 Support member (frame eaves)
23 Support member (divider support rod)
25 Grounding body

Claims (1)

A reaping structure for a combine reaping device, a reaping device, a reaping device, and a reaping device with a reaping cereal conveyance device connected to the front part of the traveling machine body so as to be able to be raised and lowered,
A plurality of grounding bodies for supporting a grounding load are provided at the lower part of the cutting part,
Among the plurality of grounding bodies, the grounding body attached to the hook-shaped support member provided at the end of the cut portion of the cutting part is not projected from the support member to the already cut side. The harvesting of the combine, characterized in that it is formed wider than the overhanging amount on the cutting side, and the grounding area of the grounding body on the already-cutting side is set larger than the grounding area of the other grounding body Part lifting structure.

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