JP2006204198A - Reaping height detecting device of combined harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaping height detecting device capable of avoiding damage to or deformation of a grounding body without requiring a special retracting operation, in case of reversing, and capable of highly keeping maintainability of a harness led out of an angle sensor. <P>SOLUTION: In this reaping height detecting device, a detection case 22 which supports the grounding body 23 and the angle sensor 24 is positioned, wherein the grounding body 23 upward and downward swings around a front fulcrum X as the center and follows grounding and the angle sensor 24 detects the swing of the grounding body 23. Further, the detection case 22 is supported so as to be retractable and rotatable in a forward and upward direction around a rear fulcrum Y positioned in a space more backward than the front fulcrum X as the center. Furthermore, a fitting posture of the angle sensor 24 to the detection case 22 is set so that a led-out position d of the harness 53 which is backward led out of the angle sensor 24 is positioned more upward than the rear fulcrum Y, when the detection case 22 exists in a detecting position after rotating in a forward and downward direction, and the led-out position d of the harness 53 is positioned more downward than the rear fulcrum Y, when the detection case 22 exists in a retracting position after rotating in the forward and upward direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutting height detection device used for automatic cutting height control in a combine, and in particular, it is vertically moved around a front fulcrum at a lower portion of a cutting portion connected to a front portion of a traveling machine body so as to be movable up and down. The present invention relates to a cutting height detecting device in which a grounding body that swings and follows the grounding is provided and the swinging of the grounding body is detected by an angle sensor.

  The grounding body used in the cutting height detection device swings up and down around the front fulcrum, so if you move backward with the cutting part lowered to the working height, the grounding body will bite into the ground and be damaged. Or, there is a risk of significant deformation.

Therefore, as a means for solving such a problem, as disclosed in Patent Document 1, a sensor unit composed of a grounding body and a sensor box is supported so that it can be retracted upward, or only the grounding body is supported. Has been proposed that can be retracted upward.
Japanese Utility Model Publication No. 58-152837 (FIGS. 2, 6, and 7)

  In the cutting height detection device disclosed in Patent Document 1, it is possible to reliably avoid the grounding body from biting into the ground by retracting the entire sensor unit or the grounding body upward during reverse travel. However, an operation mechanism for retracting and moving the sensor unit or the grounding body is required, and the structure becomes complicated and the operation becomes troublesome.

  The present invention has been made paying attention to such points, and can avoid damage and deformation of the grounding body during reverse travel without requiring a special retraction operation, and can also prevent the harness from the angle sensor. The main purpose is to provide a cutting height detection device capable of maintaining high maintainability.

1st invention detects the rocking | fluctuation of the grounding body which rocks | fluctuates up and down centering | focusing on a front fulcrum and follows a grounding in the lower part of the cutting part connected to the front part of the traveling body so that raising and lowering is possible. Deploying a detection case supporting an angle sensor, extending the grounding body backward and downward, and configured to swing following the ground using the rear end as a grounding point,
The detection case is supported at the rear fulcrum installed rearward from the front fulcrum so as to be retractable and pivotable in the forward upward direction, and the grounding external force acting on the rear end of the grounding body at the time of advance is The detection case acts so as to rotate in the forward and downward direction around the rear fulcrum, and the ground contact external force acting on the rear end of the grounding body during reverse rotation causes the detection case to rotate in the forward upward direction around the rear fulcrum. Configured to act,
When the detection case is in the detection position rotated in the forward and downward direction, the lead-out position of the harness pulled out rearward from the angle sensor is located above the rear fulcrum, and the detection case is moved up and retracted. The mounting posture of the angle sensor with respect to the detection case is set so that the lead-out position of the harness is positioned below the rear fulcrum when in the position.

  According to the above configuration, if the grounding body is moved backward while the rear end portion is grounded, an external force acts forward on the rear end portion of the grounding body, and the external detection force causes the detection case to retreat forward about the rear fulcrum. As a result, the front fulcrum of the grounding body largely retreats upward. Accordingly, the grounding body is in an upright posture with the rear end in contact with the ground, and the grounding body slides and moves on the ground as the aircraft moves backward while maintaining this posture.

  In addition, when the detection case rotates from the detection position to the retracted position, the harness derived position derived from the angle sensor moves along an arc trajectory centered on the rear fulcrum that is the rotation fulcrum of the detection case. To do. In this case, since the harness lead-out position moves from above the rear fulcrum to below the rear fulcrum, for example, compared to the case where the harness lead-out position moves only in the upper region of the rear fulcrum or only in the lower region of the rear fulcrum. Thus, the position variation in the front-rear direction of the harness lead-out position is small.

  Here, in order to absorb the back and forth movement of the harness lead position, the harness led toward the rear of the aircraft will be slackened in advance, but if the harness lead position moves back and forth as described above, Less slack to give to the harness.

  In addition, when switching from reverse to forward, a rearward external force will be applied to the rear end of the grounding body in a standing posture, and the detection case that no longer operates in the upward direction of the detection case will be restored to the original detection case. It returns to the working position.

  Therefore, according to the first aspect of the present invention, the grounding body and the detection case can be automatically retracted and rotated upward using the ground reaction force without requiring any special operation during reverse travel, thereby avoiding damage or deformation. A cutting height detection device with excellent durability could be constructed.

  Moreover, by rationally pulling out the harness from the angle sensor, it is possible to reduce the slack imparted to the lead-out harness toward the rear of the aircraft, thereby preventing the harness from being bent or twisted inappropriately. Accidents can be avoided in advance.

According to a second invention, in the first invention,
The angle sensor is attached to the outer surface of the detection case, and a protective cover that covers the angle sensor is provided with a locking portion that locks and guides the harness and leads it to the outside.

  According to the said structure, the latching | locking part of a protective cover comprises the lead-out position of the harness with respect to a detection case. And since the harness part between this latching | locking part and an angle sensor will be hold | maintained in a fixed attitude | position, the accident where the harness derivation | leading-out part of an angle sensor is bent and it can disconnect can be prevented.

According to a third invention, in the second invention,
The harness is configured to bend and guide laterally at the locking portion and lead out to the outside of the cover.

  According to the above configuration, even if tension is applied from the locking part to the rear harness part by guiding the harness bent and guided laterally by the locking part to the rear of the machine body, the tension is received by the locking part. Thus, the harness portion between the locking portion and the angle sensor is not affected, and the harness is prevented from being pulled out from the angle sensor or poorly connected.

  FIG. 1 shows a side view of the self-removing combine. This combine is connected to a front part of a traveling machine body 2 provided with left and right crawler traveling devices 1 so as to be able to move up and down with a four-row cutting specification, and to the traveling machine body 2, a driving unit 4, a threshing device 5, and The grain collection tank 6 and the like are mounted.

  The mowing unit 3 includes four pulling devices 7 that pull a plurality of planted cereals into a cutting posture, a clipper-type mowing device 8 that cuts the stock of the raised cocoons, and a plurality of mowing cereals. It is equipped with a feeding and conveying device 10, etc., which is fed to the starting end of the feed chain 9 equipped in the threshing device 5 and delivered in a laid down posture. The base end of the trimming part frame 11 is supported by a base 12 erected on the front part of the traveling machine body 2 so as to be able to swing up and down around the lateral fulcrum P. The mowing unit 3 is driven up and down by the expansion and contraction operation of the hydraulic cylinder 13 mounted across the part frame 11.

  The hydraulic cylinder 13 is controlled and operated by an electromagnetic valve (not shown). This electromagnetic valve is automatically controlled based on detection information from a cutting height detection device A provided at the lower front end of the cutting unit 3 (automatic cutting (automatic cutting). (Height control) and switching operation is also performed by an artificial command provided by operating the operation lever 14 provided in the operation unit 4 back and forth.

  As is well known, the automatic cutting height control is to raise and lower the cutting unit 3 by operating a control valve so as to maintain the ground height (cutting height) of the cutting unit 3 at a set value. In the invention, the cutting height detection device A used for the automatic cutting height control is configured as follows.

  As shown in FIG. 2, at the lower end of the mowing portion 3, a weeding frame 15 that is one more than the number of raised lines (in this case, five) is arranged in parallel in a forward cantilever shape with a predetermined left and right spacing. The lower end of the device 7 is connected and supported by being raised at the front end of the weeding frame 15, and the weeding tool 18 is bolted to the support rod 16 inserted into and connected to the weeding frame 15 so as to be adjustable and detachable. ing. Then, a cutting height detection device A is provided below each of the second support rods 16 from the left and right outer ends, for example, based on the average value of the cutting heights obtained by the left and right cutting height detection devices A Automatic cutting height control is performed.

  As shown in FIG. 3, this cutting height detection device A detects the height of the cutting unit 3 with respect to the ground (farm scene) in a grounded manner, is bent in a mountain shape, and has a vertical plate shape at the front end of the support rod 16. A bracket 17 is provided, and the weeding tool 18 is bolted to the vertical plate-shaped bracket 17 so that the position of the weeding tool 18 is adjustable and detachable, and a cutting height detection device A is mounted.

  The cutting height detection device A basically includes a sensor bracket 21 connected to and supported by the vertical plate-shaped bracket 17, a detection case 22 attached to a side surface of the sensor bracket 21, and a laterally facing front portion of the detection case 22. The grounding body 23 is supported so as to be able to swing up and down around the front fulcrum X, and an angle sensor 24 using a rotary potentiometer attached to the side surface of the detection case 22.

  The sensor bracket 21 is formed by bending a thick plate material into a bowl shape in plan view, and a rolling support shaft 25 protruding from the front end thereof is fixed to the rear end portion of the vertical plate bracket 17. The entire cutting height detection device A is rotatably supported around the rolling fulcrum R by being inserted into and connected to the boss portion 26. As shown in FIGS. 6 and 7, a torsion spring 27 is externally fitted to the boss portion 26, and both free end portions 27 a and 27 b project rearward from the support rod 16 and are fixed spring receiving pins 28. Is pinched with a predetermined initial elastic force from the left and right, and a pin 29 protruding from the upper front end of the sensor bracket 21 is held between the free end portions 27 a and 27 b of the torsion spring 27.

  Accordingly, the torsion spring 27 held in a fixed posture via the fixed spring receiving pin 28 sandwiches the pin 29 from the left and right, so that the sensor bracket 21 that can rotate around the rolling fulcrum R has the grounding body 23 directly below. It is elastically held in a predetermined neutral position located at. When a greater turning force than set is applied to the sensor bracket 21 from the outside, the sensor bracket 21 is rotated while the one of the free end portions 27a and 27b of the torsion spring 27 is pushed and deformed by the pin 29, and the external force is eliminated. The sensor bracket 21 is returned to its original posture by a torsion spring 27. Therefore, even if a large external force acts on the grounding body 23 sideways, such as when the body is steered while the grounding body 23 is grounded, the cutting height detection device A as a whole rotates in a rolling manner. Damage to the detection device A is avoided beforehand.

  A bearing bush 30 and an oil seal 31 are incorporated in the boss portion 26 so that the cutting height detection device A can be smoothly rotated and removed and attached to the boss portion 26. The rolling fulcrum portion is waterproofed by using a rubber washer for the washer 39 of the set screw 38. Further, a guide rib 32 protrudes from one side portion of the vertical plate bracket 17 so as to extend rearward, and obliquely rearward from the other side portion of the vertical plate bracket 17 to near the outside of the front portion of the sensor bracket 21. A guide member 33 made of a leaf spring material is provided in a cantilever manner, and guides such as weeds and straw scraps that approach the rotation fulcrum of the sensor bracket 21 as the vehicle travels forward are guided by the guide rib 32 and the guide member 33. It is configured to escape left and right.

  A fixed support shaft 35 protrudes laterally from the rear portion of the sensor bracket 21, and the detection case 22 is rotatably mounted around the rear support point Y on the fixed support shaft 35. The detection case 22 has a left and right divided structure, and an inner part described later is incorporated in a state in which one of the divided cases 22a is inserted into the fixed support shaft 35 and is prevented from coming off by the stopper ring 34, and then the divided case 22a is assembled. The other split case 22b is joined to the case 22a and screwed together. A needle bearing 36 and an oil seal 37 are incorporated between the fixed support shaft 35 and the detection case 22 to reduce the rotational resistance of the detection case 22.

  A fulcrum shaft 41 is horizontally supported at the front portion of the detection case 22, and the grounding body 23 is connected to the protruding end of the fulcrum shaft 41. As shown in FIG. 11, the grounding body 23 is composed of a strip-shaped main portion 23 a having a suitable width and a front portion that is tapered, and a longitudinal plate that is bent and connected to one side of the front portion. The connecting base portion 23b is detachably bolted to the projecting end portion of the fulcrum shaft 41. The main portion 23a of the grounding body 23 extends rearward and downward at a position immediately below the extension line of the rolling fulcrum R, and the curved rear end portion 23c is more than the rear fulcrum Y of the detection case 22. The length of the main part 23a is set so as to be grounded at the rear. The front fulcrum portion of the grounding body 23 is surrounded by the front end portion of the sensor bracket 21 and the bent piece 21a that is bent and extended toward the rear, and is a contaminant that approaches from the front as the vehicle travels forward. Is prevented from getting around the front fulcrum X.

  The angle sensor 24 is screwed to the side surface of the detection case 22, and its sensor shaft 24a is inserted into the case. The fulcrum shaft 41 provided at the front portion of the detection case 22 is provided with a large diameter gear 42, and a small diameter gear 43 that meshes with the large diameter gear 42 is connected to the sensor shaft 24a. When the fulcrum shaft 41 is rotated by the vertical swing of the body 23, it is amplified and transmitted to the sensor shaft 24a, and a small vertical movement of the grounding body 23 is detected by the angle sensor 24 as a large angle change. Yes.

  A spring 45 is stretched over the large-diameter gear 42 and the spring receiving pin 44 in the case, and the fulcrum shaft 41 is urged to rotate so that the grounding body 23 is urged to swing downward. The body 23 smoothly swings up and down following the change in the height of the ground. Here, the rotation end limits of the fulcrum shaft 41 and the grounding body 23 are restricted by contacting the end portions 42a and 42b in the circumferential direction of the large-diameter gear 42 with the raised portions 46a and 46b in the case. .

  3, when the grounding body 23 swings to the lower limit with respect to the detection case 22, the rear end portion 23c of the grounding body 23 is positioned substantially directly below the rear fulcrum Y. It is set to be. Accordingly, when the cutting unit 3 is greatly lifted and lowered again after traveling is stopped, the grounding body 23 that has swung to the lower limit as the cutting unit 3 is lifted is lowered by the lowering of the cutting unit 3. After grounding from the rear end portion 23 c, it swings upward around the front fulcrum X, but the rear end portion 23 c of the grounding body 23 that starts swinging upward around the front fulcrum X immediately becomes the rear portion of the detection case 22. Move backward from the fulcrum Y.

  A flange 47 is attached to the inner end portion of the fixed support shaft 35 that rotatably supports the detection case 22 so as to be integrally rotatable, and spans between the flange 47 and a spring receiving pin 48 in the case. The return spring 49 is stretched, and the detection case 22 is lightly rotated and biased around the rear fulcrum Y in the forward downward direction. In addition, a stopper 50 is protruded laterally at the front portion of the outer side surface of the detection case 22, and the stopper 50 contacts the upper end edge of the sensor bracket 21, thereby limiting the forward downward rotation limit of the detection case 22. It is regulated in contact.

  The cutting height detection device A according to the present invention is configured as described above. When the cutting unit 3 is at the cutting work height and is moving forward, as shown in FIG. The rear end portion 23c is biased to ground behind the rear fulcrum Y of the detection case 22, and the ground reaction force acting on the rear end portion 23c works to rotate the detection case 22 in the forward downward direction. 22 is stably held at a detection position that is a predetermined forward-lowering rotation limit due to its own weight, tension of the return spring 44, grounding reaction force from the grounding body 23, drag resistance accompanying grounding sliding of the grounding body 23, and the like. In this state, the grounding body 23 swings up and down in response to a change in the height of the ground, and the swing is detected by the angle sensor 24.

  When the backward movement is performed without raising the mowing unit 3, an external force acting forward is applied to the rear end portion 23c of the grounding body 23, and acts as a rotational force in the upward direction on the detection case 22. In this case, the detection case 22 will rotate upward when it receives its own weight and a turning force in the forward and upward direction that is larger than the turning force in the forward and downward direction by the return spring 49, as shown in FIG. As described above, the detection case 22 rotates upwardly about the rear fulcrum Y. As a result, the front fulcrum X of the grounding body 23 is retracted upward, and the main part of the cutting height detection device A is swung up to the retracted position in the space below the bent support rod 16.

  Further, as shown in FIG. 10, the step 51 formed in the vicinity of the rear fulcrum Y inside the detection case 22 contacts the step 47a of the flange 47 in the fixed state, so that the detection case 22 When the swing-up rotation limit is restricted and the detection case 22 is rotated backward to the swing-up rotation limit, the grounding body 23 that swings to the biased swing limit is lower than the lower end of the vertical plate-shaped bracket 17. It is designed to retreat upward.

  Further, when switching to the forward movement, the detection case 22 at the retracted position rotates downward and automatically returns to the original detection position so that the cutting height can be detected. In this case, the return spring 49 is provided so as to be surely returned to the front-down position even when the rotational resistance at the rear fulcrum Y increases, and is a spring for biasing the grounding body 23 to ground. What is weaker than 45 is used.

  The angle sensor 24 is covered with a resin protective cover 52 attached to the outside thereof, and a harness 53 led out from the rear end of the angle sensor 24 is integrally formed inside the protective cover 52. After being guided by the locking and guided toward the inside of the machine body, it is led backward. When the detection case 22 is in the normal detection position, the harness lead-out position d of the protective cover 52 is above the rear fulcrum Y of the detection case 22, and when the detection case 22 is swung up to the retracted position, the protective cover is provided. The angle sensor 24 is attached in advance to the detection case 22 so that the harness lead-out position d of 52 is below the rear fulcrum Y of the detection case 22. As a result, even if the detection case 22 rotates greatly, the movement of the harness 53 in the front-rear direction is reduced, and the harness 53 is not unduly twisted or pulled, thereby preventing a disconnection accident.

  [Other Examples]

  (1) In the above embodiment, the harness 53 is temporarily guided laterally by the locking portion 54 of the protective cover 52 and then led out of the cover, but the harness 53 is hooked forward and backward by the locking portion 54. The guide may be stopped and led out of the cover.

  (2) The engaging portion 54 that engages and guides the harness 53 may be formed of another member such as a spring plate member and connected to the protective cover 52.

  (3) As shown in FIGS. 12 and 13, the guide bracket 33 made of a leaf spring material is extended rearward to be elastically pressed against the outer surface of the bent piece 21 a of the sensor bracket 21, so that the sensor bracket 21 is rotated. When this occurs, the guide member 33 is elastically deformed following this, and the foreign matter guide function can be maintained.

Combine side view Schematic plan view of the cutting part Left side view of cutting height detection device Plan view of cutting height detector Right side view of cutting height detection device Longitudinal side view of main part of cutting height detection device Front view showing rolling structure of cutting height detection device Cross-sectional plan view of cutting height detector Left side view of cutting height detection device in reverse Longitudinal side view in the detection case swing-up state Top view of grounding body The side view which shows the cutting height detection apparatus of another Example The top view which shows the cutting height detection apparatus of another Example.

Explanation of symbols

2 traveling machine body 3 cutting part 22 detection case 23 grounding body 23a rear end part 24 angle sensor 52 protective cover 53 harness 54 locking part d harness lead-out position X front fulcrum Y rear fulcrum

Claims (3)

Detection that supports a grounding body that swings up and down around the front fulcrum and follows the grounding and an angle sensor that detects the swinging of the grounding body at the lower part of the cutting part that is connected to the front part of the traveling machine so as to be movable up and down. A case is arranged, and the grounding body extends backward and downward and is configured to swing following the ground using the rear end as a grounding point.
The detection case is supported at the rear fulcrum installed rearward from the front fulcrum so as to be retractable and pivotable in the forward upward direction, and the grounding external force acting on the rear end of the grounding body at the time of advance is The detection case acts so as to rotate in the forward and downward direction around the rear fulcrum, and the ground contact external force acting on the rear end of the grounding body during reverse rotation causes the detection case to rotate in the forward upward direction around the rear fulcrum. Configured to act,
When the detection case is in the detection position rotated in the forward and downward direction, the lead-out position of the harness pulled out rearward from the angle sensor is located above the rear fulcrum, and the detection case is moved up and retracted. The combine cutting height detecting device is characterized in that the mounting posture of the angle sensor with respect to the detection case is set so that the lead-out position of the harness is positioned below the rear fulcrum when in position.   The combine cutting height according to claim 1, wherein the angle sensor is attached to the outer surface of the detection case, and a protective cover that covers the angle sensor is provided with a locking portion that locks and guides the harness and leads it to the outside. Detection device.   3. The combine cutting height detection device according to claim 2, wherein the harness is bent and guided laterally at the locking portion and led out of the cover.

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