JP3935867B2 - 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, combine harvesters have been mainly equipped with a so-called automatic cutting height control device that is configured to automatically raise and lower the cutting part to follow the field scene, and the height of the cutting part to the ground is an ultrasonic sensor. , 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, the ground height detecting device is also known from old that constitutes the earthed for detecting a rotary potentiometer the vertical swing displacement of the ground sensors to ground track.
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.

Features of the first invention, causes stiffness device, cutting device, the cutting portion having a cutting culms conveying device, the cutting unit lifting structure combined with a vertically movable coupled to a front portion of the vehicle body, the cutting portion The urging means for urging in the upward direction to reduce the ground load of the reaping portion is provided, and a plurality of grounding bodies for receiving and supporting the reaping portion in a field scene are provided below the reaping portion , Among the grounding bodies, the grounding side on the already-cut side is configured to have a larger grounding area than the other grounding bodies.

According to the above configuration, at the time of harvesting and harvesting, the cutting unit descends until each grounding body comes into contact with the ground pressure that balances its own weight and the urging force of the urging means, and thereafter follows the undulation of the farm scene. Will come up and down. In other words, without performing special lifting control, the cutting part can be grounded and tracked without penetrating its tip into the field scene regardless of the forward tilt of the aircraft or the uplift of the field scene. It is possible to harvest crops with a substantially constant and stable cutting height.

Moreover, since the grounding body on the uncut side has uncut crops laterally outside, and the grounding body on the inside of the cutting part has crops to be cut in the vicinity, expansion of the width of these grounding bodies is limited. On the other hand, the grounding body on the cut side does not have crops on the outside of the side, so it is possible to expand the width of the grounding body effectively, and the grounding area on the ground side on the cutting side is increased. By doing so, a plurality of grounding bodies can be grounded stably with a large grounding area as much as possible, and thereby , the reaping part can be grounded and tracked in a stable state with little settlement even in a soft field.

Therefore, according to the first aspect of the invention, the cutting portion can be made to follow the ground stably with a ground contact area as large as possible, and stable weight following with less subsidence can be realized even in a soft field, resulting in an increase in cost. While not using an automatic lifting control device, it is possible to perform a harvesting operation at a relatively stable cutting height.

A feature of the second invention is that, in the first invention, the grounding body is provided at a lower portion of a divider support rod extending in a forward cantilever shape and supports a rear end portion of the divider support rod. It extends to the frame rod provided in the cutting part, and the extended portion is received and supported by the frame rod .

According to the above configuration, the grounding body for grounding and supporting the mowing part is attached to the divider support rod provided at the front end of the aircraft, and this causes the aircraft to lean forward and tilt, or to reach the raised surface of the rice field. In this case, since the grounding body comes into contact with the vicinity of the front end of the cutting portion to prevent the infiltration into the ground, it is possible to prevent the divider from sticking into the raised portion of the field.

Further, since the grounding body attached to the divider support rod extends beyond the divider support rod to the lower side of the frame rod, the grounding unit is grounded for a long time in the front-rear direction so as to reliably support the grounding portion. . Moreover, since the rear end portion of the grounding body extending to the lower side of the frame rod is received and supported by the frame rod, the grounding load acting on the grounding body can be reliably received by the frame rod.

Therefore, according to the second invention, a relatively long grounding body can be provided in the vicinity of the front end of the cutting part, and the cutting part can be grounded and tracked to the field scene by its own weight without being pushed into the ground. .

According to a third aspect of the invention, in the first or second aspect of the invention, the grounding body has a vertical cross-sectional shape bent in a U shape with its left and right ends positioned upward, and a front end and a rear end. The bottom surface of the grounding body is formed in a boat shape, and the rear end portion of the U-shaped cross section of the grounding body is engaged with the frame rod from below .

According to the said structure, the grounding body comprised in the boat shape which made the lower surface of the front-end part and the rear-end part forward | rised smoothly slides on a farm scene, without being caught even if it advances to grounding or it advances after grounding. The ground body, together with the front end portion is connected, because they are engaged with and supported on the rear end portion canvas frame rod, rugged enough next load received from the field surface upon steering the aircraft with the ground be able to.

Therefore, according to the third aspect of the invention, the rear end portion of the grounding member that extends rearwardly cantilevered from the de-divider supporting rod can be firmly supported, for example, causing stiffness device rear end portion of the grounding member Compared to a structure in which a bolt is connected to the support frame, the structure can be simplified, and the cost can be reduced.

According to a fourth aspect of the present invention, there is provided biasing means for biasing the mowing portion in the upward direction to reduce the ground contact load of the mowing portion .

According to the above configuration, when the cutting part is grounded and tracked under its own weight during the harvesting and harvesting operation, the cutting part descends until the grounding body comes into contact with the ground pressure balanced with its own weight and the urging force of the urging means. As a result, the ground height of the cutting part can be maintained substantially constant without performing special lifting control, and cutting harvesting at a stable cutting height can be achieved. It can be carried out.

  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. The combine is in front of the traveling machine body 2, which is running in run a pair of left and right crawler rows device 1, together with the cutting unit 3 is swung vertically movably coupled around the upper rear of the fulcrum P, the traveling machine body 2 In the right front half of the vehicle, a driving unit 4 having a driving unit is arranged, and a threshing device 5 is mounted on the left side of the traveling machine body 2, and the harvested grains are stored in the right half part of the traveling machine body 2. It has a structure in which a grain tank 6 is provided.

This example the cutting unit 3 is configured to Article 2 mowing specification, a pair of left and right causes this to device 7 cause up to standing posture of Jo Tokoro a planting culms, a strain base portion of culms was caused A clipper-type cutting device 8 for cutting, a rotary packer 9 for merging the harvested cereals for two strips to the middle part of the trimming width, holding the stocker side of the merged reaped cereals, and transporting it upward and backward, The front part of the traveling machine body 2 is capable of swinging up and down around the fulcrum P, such as the harvested cereal conveyor 11 that feeds the feed chain 10 provided on the left outer surface of the threshing device 5 in a sideways posture. It is configured to be attached to the cutting unit main frame 12 connected to the frame.

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 lateral 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.

Moreover, the support arm 15, together with the screw shaft 17 to be forward and reverse drive is laterally bridged supported by the electric motor 16 with reduction gear, the movable member 18 is screw-fed Rica dynamic in the left and right by the screw shaft 17 The mowing portion main frame 12 is engaged with the screw shaft 17 so that the position of the mowing portion main frame 12 is changed to the left and right 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 split operations in which breaks new ground field of the intermediate, mowing unit 3 is moved until the right limit of the lateral movement range, by positioning the cutting part 3 to the left and right crawler travel unit 1 in horizontal width, 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. In the model specifications for horizontal sliding the cutting unit 3 as described above, since the fulcrum plate interferes when lateral movement to another device, as shown in FIG. 14 (b), do not attach the fulcrum plate to the 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. together with the lower of the causes this to device 7 is connected to and supported via a stay 22, in the frames rod 21, the cutting device 8 and rotated packer 9, and the like are supported. 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 23 a so as to be adjustable in height and angle. Yes. A front end of a steel plate grounding body 25 is welded and fixed to the lower portion of the divider support rod 23, and a connecting metal fitting 26 that connects the front and rear intermediate portions of the divider support metal 23 and the grounding body 25 is erected. 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-side 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 grounding body 25 on the right side is already-cutted ground. 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 in which the drainage 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 to pivotally supporting point bracket 33 back and forth around fulcrum b, in correspondence with the switching position of the control valve 31, "neutral", "up" In addition, 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. In other words, the lock pin 41 acts on the arc-shaped outer periphery of the lock plate 38 in the lifting operation range from the “up” position to the “down” position of the operation lever 30, and the operation lever is operated by the neutral return biasing force by the torsion spring 34. 30 returns to neutral. 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

2 vehicle body 3 mowing unit 7 causes this to 8 mowing apparatus 11 cutting culms conveying device
19 Energizing means 21 Frame 杆
23 divider support rod 25 grounding body

Claims (3)

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,
Urging means for urging the cutting part in the upward direction to reduce the ground load of the cutting part;
Equipped with a plurality of grounding bodies for receiving and supporting the mowing part in a farm scene at the lower part of the mowing part ,
The harvesting part raising / lowering structure for a combine harvester, wherein a grounded body on the already-cutted side among the plurality of grounded bodies is configured to have a larger ground contact area than other grounded bodies.   The grounding body is mounted on a lower part of a divider support rod extending in a forward-facing cantilever shape, and is extended to a frame rod provided in the mowing unit so as to support a rear end portion of the divider support rod. 2. The combine mowing unit lifting / lowering structure according to claim 1, wherein the protruding portion is received and supported by the frame rod. The grounding body has a vertical cross-sectional shape bent in a U shape with its left and right ends positioned upward, and is configured in a boat shape with the front end and the bottom of the rear end raised upwards,
3. A combine mowing unit lifting structure according to claim 1, wherein a rear end portion of the U-shaped cross section of the grounding body is engaged with the frame rod from below.

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