JP2007174998A - Reaping height detecting device of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the regulation of a reaping height to be easily carried out in a reaping height-detecting device of a combine harvester constituted by arranging a grounding body turnable in the upper and lower direction by centering a front part fulcrum, and a detection case supporting an angle sensor for detecting the turning of the grounding body at the lower part of a reaping part, and extending the grounding body as a grounding point in the rear lower direction so that the rear end part is turned so as to follow the ground. <P>SOLUTION: The reaping height-detecting device is constituted by connecting a grass-dividing tool 17 to the front end part of a grass-dividing frame 15 extended from the lower part of the reaping part 3 in a frontward cantilever shape, and attaching the detection case 22 to the grass-dividing tool 17 so as to be supported. <P>COPYRIGHT: (C)2007,JPO&INPIT

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.

As the cutting height detecting device, a weeding tool is attached to the front end portion of the weeding frame extending forward and cantilevered at the lower part of the cutting part so that the vertical position can be adjusted, and at the rear of the weeding tool There is known one in which a cutting height detection device is attached to and supported by a weed frame (see, for example, Patent Document 1).
JP 2005-95045 A

  In the cutting height detection device disclosed in Patent Document 1, when changing the cutting height according to the growth state or the lodging state of the crop, etc., the reference posture of the grounding body, that is, the cutting unit lifting control In this case, the height of the weeding tool is also adjusted. That is, when the cutting height is adjusted to increase, the position of the weeding tool is adjusted downward, and conversely, when the cutting height is adjusted to decrease, the position of the weeding tool is adjusted upward.

  In this case, if the height adjustment of the weeding implement is neglected or forgotten, the crop may not be raised accurately or the weeding implement may enter the field. For example, if the ground posture is changed to increase the trimming height, if the lowering of the weeding tool is neglected, the grounding tip of the weeding tool tip will move forward, and the ground will fall Occasionally, crops can be scooped up and raised and cannot be guided to the device. Also, if you change the grounding body's reference posture to reduce the cutting height and neglect the upward adjustment of the weeding tool, the grounding tip of the weeding tool tip will move forward and the aircraft will move forward. Even if it falls a little forward or there is a small bump in front of the field, weeds will enter the field.

  The present invention has been made paying attention to such points, and an object of the present invention is to provide a cutting height detection device capable of easily adjusting the cutting height.

A first aspect of the present invention is a grounding body that can swing up and down around a front fulcrum at a lower part of a cutting part that is connected to a front part of a traveling machine body so as to be movable up and down, and an angle at which the swinging of the grounding body is detected. In a combined cutting height detection device configured to deploy a detection case supporting a sensor, extend the grounding body rearward and downward and swing the ground following the grounding end as a grounding point,
A weeding tool is connected to a front end portion of a weeding frame extending in a cantilevered forward direction at the lower part of the cutting part so that the height can be adjusted, and the detection case is attached to and supported by the weeding tool. Features.

  According to the above configuration, the height of the detection case and the grounding body mounted thereon is adjusted at the same time by adjusting the position of the weeding tool up and down with respect to the weeding frame. There is no change in the height relationship between the ground and the ground.

  Therefore, according to the first aspect of the present invention, only by adjusting the position of the weeding tool up and down with respect to the weeding frame, while maintaining the state of exerting an accurate crop scooping function without entering the field. The cutting height can be changed and the cutting height can be easily adjusted.

  According to a second aspect of the present invention, the detection case is supported so that it can be retracted and rotated in the forward upward direction around a rear fulcrum installed behind the front fulcrum, and at the rear end of the grounding body during advancement. A grounding external force acting acts to rotate the detection case in the forward downward direction around the rear fulcrum, and a grounding external force acting on the rear end portion of the grounding body during reverse travel causes the detection case to move the detection case to the rear fulcrum. It is configured to act so as to rotate around in the upward direction.

  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.

  Therefore, according to the second aspect of the present invention, the grounding body and the angle sensor are automatically retracted and rotated upward using the ground reaction force without requiring any special operation during reverse travel, thereby avoiding damage or deformation. Therefore, it is possible to configure a cutting height detection device with excellent durability.

According to a third invention, in the first or second invention,
The grounding body is composed of a plate material facing in the vertical direction, the grounding body is bent upward at a position near the front end, and a front guide part having an angle of attack in front of the bending point is formed. A mounting base portion is formed in a vertical wall shape on one side of the front end portion, and an inclined side for a crop plan is formed on the other side of the front end portion of the front guide portion.

  According to the above configuration, the mounting base folded in a vertical wall shape at the front end of the grounding body is positioned higher from the field scene, and even if the grounding body breaks into the lower part of the crop, the crop is in front. It is pushed and guided sideways on the inside inclined side, and can pass smoothly without being caught by crops.

  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 with a carry-out device is mounted.

  As shown in FIG. 13, the crawler traveling device 1 includes a driving sprocket 60 at the front end, a tension wheel 61 at the rear end, a plurality of (five in this example) grounding wheels 62 disposed therebetween, and a carrier. A crawler belt 64 is wound around the roller 63 and configured. A plurality of grounding wheels 62 in the first half (three in this example) are pivotally supported on the front movable track frame 65, and a plurality of grounding wheels 62 in the second half (in this example) are arranged in the rear. A slide frame 67 is mounted on the movable track frame 66 so as to be freely rotatable. A slide frame 67 is attached to the rear portion of the rear movable track frame 66 so as to be adjustable in a forward and backward manner by a screw jack. The tension ring 61 is attached to the rear end of the slide frame 67. It is pivotally supported so that it can freely rotate.

  A fixed track frame 69 is connected via a pair of front and rear legs 68 to the lower left and right of the body frame 80 constituting the traveling machine body 2, and the carrier roller 63 is attached to the fixed track frame 69. A front swing arm 70 and a rear swing arm 71 that can swing up and down around fulcrums a and b are pivotally connected to the front and rear of the fixed track frame 69 in a rearward direction. A front movable track frame 65 is pivotally supported by an auxiliary link 72 via an auxiliary link 72, and a rear movable track frame 66 is pivotally connected to the free end of the rear swing arm 71. As shown in FIGS. 14 and 15, an intermediate frame 75 is pivotally connected across a bracket 73 provided at the rear end of the front movable track frame 65 and a bracket 74 provided at the front end of the rear movable track frame 66. The front movable track frame 65 and the rear movable track frame 66 are coupled so as to be able to bend relative to each other. Note that the relative refraction range is regulated by contact between the stoppers 76 and 77 provided on the brackets 73 and 74 and the intermediate frame 75.

  Operation arms 70a and 71a extend from the base ends of the front swing arm 70 and the rear swing arm 71 so as to be able to swing integrally, and both the operation arms 70a and 71a are linked and linked by a linkage link 78. A hydraulic cylinder 79 is installed over the rear operation arm 71 a and the body frame 80.

  According to the above configuration, when the hydraulic cylinder 79 is extended, the front swing arm 70 and the rear swing arm 71 are swung downward synchronously, and the front movable track frame 65 and the rear movable track frame 66 are synchronized. Is moved downward, and the ground height of the fuselage frame 80 is relatively increased. Conversely, when the hydraulic cylinder 79 is shortened, the front swing arm 70 and the rear swing arm 71 are swung upward in synchronization, and the front movable track frame 65 and the rear movable track frame 66 are moved upward. The ground clearance of the body frame 80 is relatively reduced. Therefore, the hydraulic cylinders 79 in the left and right crawler traveling devices 1 are independently controlled to change the ground height on the left and right of the body frame 80 to change and adjust the left and right inclined posture of the traveling body 2. It is.

  In the crawler traveling device 1 having the above-described configuration, the front movable track frame 65 and the rear movable track frame 66 tilt independently, so that the ground contact portion of the crawler belt 14 is easily adapted to the shape of the traveling ground as shown in FIG. Thus, the aircraft can be prevented from pitching and swinging greatly when passing through the unevenness of the running ground.

  The mowing unit 3 joins four raising devices 7 for raising the planted culm into a mowing posture, a clipper-type mowing device 8 for cutting the stock of the cultivated culm, and a plurality of mowing culms. Then, a feed conveyance device 10 that is nipped and conveyed rearward and upward and delivered in a sideways posture to the starting end portion of the feed chain 9 equipped in the threshing device 5 is equipped. The base end of the cutting unit frame 11 provided in the cutting unit 3 is supported by the base 12 standing on the front part of the body frame 80 so as to be able to move up and down around the horizontal fulcrum P, and the body frame The cutting unit 3 is driven up and down by the expansion and contraction operation of the hydraulic cylinder 13 mounted between the cutting unit 80 and the cutting unit 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 the switching operation is preferentially 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 controls the lifting and lowering of the cutting unit 3 by automatically operating the control valve of the hydraulic cylinder 13 so that the ground height (cutting height) of the cutting unit 3 is maintained at a set value. In the present invention, the cutting height detecting 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 circular pipe weeding frame 15 that is one more than the number of raised lines (in this case, five) is arranged in parallel in a forward-facing cantilever shape with a predetermined left and right spacing. The lower part of the apparatus 7 is connected to and supported at the front part of each weed frame 15, and the tapered weed tool 17 is attached to the support rod 16 that is inserted and connected to the front end of the weed frame 15. ing. The cutting height detection device A is provided on the back of the second weeding tool 17 from the left end, and the rush detection device B is provided on the back of the weeding tool 17 on both left and right ends.

  As shown in FIG. 3, the supporting rod 16 of the weeding tool 17 in which the cutting height detecting device A is provided is bent in a mountain shape, and a bracket 16 a connected and fixed to the front end of the supporting rod 16 is attached to the weeding tool. A vertical plate-shaped mounting plate 17a provided on the back of the tool 17 is fastened and fixed from the side by two bolts 18, and a cutting height detecting device A is supported by the mounting plate 17a. The bolt insertion hole 17b formed in the mounting plate 17a is formed as a vertically inclined long hole that tilts backward and adjusts the vertical position of the weeding tool 17 and the cutting height detecting device A within the elongated hole range. Can be done.

  The cutting height detection device A detects the height of the cutting unit 3 with respect to the ground (farm scene) G in a grounded manner. Basically, the sensor bracket 21 connected to and supported by the mounting plate 17a, this A detection case 22 attached to the side surface of the sensor bracket 21, a grounding body 23 supported at the front side of the side surface of the detection case 22 so as to be able to swing up and down about a lateral front fulcrum X, and a rotation attached to the detection case 22 An angle sensor 24 using a potentiometer is used.

  As shown in FIG. 4, the sensor bracket 21 is formed by bending a thick plate material into an L shape in a plan view, and a rolling support shaft 25 projecting from the front end thereof has a rear end portion of the mounting plate 17a. The entire cutting height detection device A is supported so as to be rotatable around a rolling fulcrum R extending in the front-rear direction. Note that the rolling support shaft 25 is prevented from coming off by engaging the inner end of the pin 19 penetratingly attached to the boss portion 26 from the outer periphery with an annular groove 20 formed on the outer periphery of the rolling support shaft 26.

  As shown in FIG. 6, a torsion spring 27 is externally fitted to the boss portion 26, and both free end portions 27a and 27b sandwich the rear end portion of the mounting plate 17a from the left and right with a predetermined initial elastic force. A pin 28 projecting forward from the upper front end of the sensor bracket 21 is sandwiched between both free end portions 27 a and 27 b of the torsion spring 27.

  In this way, the free end portions 27a and 27b of the torsion spring 27 held in a fixed posture via the mounting plate 17a sandwich the pin 28 from the left and right, so that the sensor bracket 21 that can rotate around the rolling fulcrum R is provided. The grounding body 23 is elastically held in a predetermined neutral position located immediately below. When a greater rotational 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 28, and when there is no external force, the sensor bracket 21 is rotated. The 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.

  As shown in FIG. 4, a guide rib 29 protrudes from one side of the mounting plate 17a so as to extend rearward, and a rearward cantilevered guide rod 30 is provided from the other side of the mounting plate 17a. 21 is extended laterally outside the front portion of the vehicle 21, and guides the weeds and straw scraps approaching the pivotal fulcrum of the sensor bracket 21 as the vehicle travels forward, with the guide ribs 29 and the guide rods 30. And is configured to escape backwards.

  A fixed support shaft 31 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 31.

  A fulcrum shaft 32 is horizontally supported on the front portion of the detection case 22, and a front end portion of the grounding body 23 is connected and fixed to a case outward projecting end of the fulcrum shaft 32. As shown in FIG. 9, the grounding body 23 is composed of a strip-like plate material that is long before and after facing in the vertical direction, and is bent upward at a location near its front end. A rear portion from the bending point m is formed on the grounding main portion 23a having a straight side surface, and a front guide portion 23b having an angle of attack in front of the bending point m is formed. A mounting base 23c is folded up like a vertical wall on one side of the front end portion of the front guide portion 23b, and this mounting base 23c is detachably bolted and fixed to the protruding end of the fulcrum shaft 32. An inclined side s for the crop plan is formed on the other side of the front end portion of the front guide portion 23b. Even when the grounding body 23 breaks the crop stock, the crop is inclined side s of the front guide portion 23b. It is pushed and guided sideways at the side so that it can pass smoothly without being caught by crops.

  The angle sensor 24 is screw-connected to the side surface of the detection case 22, and a partial small-diameter gear 33 fixed to the inner end portion of the sensor shaft 24 a and a partial large-diameter gear fixed to the inner end portion of the fulcrum shaft 32. 34 is bitten. Accordingly, when the fulcrum shaft 32 is rotated by the vertical swing of the grounding body 23, it is amplified and transmitted to the sensor shaft 24a, so that the small vertical movement of the grounding body 23 is detected as a large angle change by the angle sensor 24. It has become.

  A spring 36 is stretched across the partial large-diameter gear 34 and the spring receiving pin 35 in the case, and the fulcrum shaft 32 is urged to rotate so that the grounding body 23 is urged to swing downward. The grounding body 23 swings up and down following the ground height change smoothly. Here, the rotation limit of the fulcrum shaft 32 and the grounding body 23 is set by the end of the partial large-diameter gear 34 in the circumferential direction coming into contact with the inner surface of the case.

  A flange 37 is attached to the inner end portion of the fixed support shaft 31 that rotatably supports the detection case 22 so as to be integrally rotatable, and spans between the flange 37 and a spring receiving pin 38 in the case. Thus, the return spring 39 is stretched, and the detection case 22 is lightly rotated and biased in the forward downward direction around the rear fulcrum Y. In addition, a stopper 40 is protruded sideways at the front portion of the outer surface of the detection case 22, and the stopper 40 comes into contact with the upper end edge of the sensor bracket 21, so that the forward downward rotation limit of the detection case 22 is limited. Is set.

  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 is energized and grounded behind the rear fulcrum Y of the detection case 22, and the ground reaction force acting on the rear end portion operates to rotate the detection case 22 in the forward downward direction. It is stably held at a detection position that is a predetermined forward-lowering rotation limit by its own weight, tension of the return spring 39, grounding reaction force from the grounding body 23, drag resistance accompanying grounding sliding of the grounding body 23, etc. 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 angle is detected by the angle sensor 24.

  The detected angle detected by the angle sensor 24 is compared with the reference angle set by the reference angle setter. If the deviation between the detected angle and the reference angle is within the dead band, the lifting control of the cutting unit 3 is in a neutral state. The ground height of the cutting unit 3 is maintained within the set range. When the deviation between the detected angle and the reference angle deviates from the dead zone, the mowing unit 3 is controlled to move up and down in a direction that reduces the deviation, whereby the cutting height is always stably maintained.

  When the reverse movement is performed without raising the mowing unit 3, an external force acting forward is applied to the rear end portion 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 rotates 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 39, 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.

  As shown in FIG. 8, the step 41 formed in the vicinity of the rear fulcrum Y inside the detection case 22 contacts the step 37a of the flange 37 in a fixed state, so that the detection case 22 swings up. A rotation limit is set.

  When switched to the forward movement, the retracted position detection case 22 is pivoted downward and automatically returned to the original detection position to bring about a state in which the cutting height can be detected. In this case, the return spring 39 is equipped so as to surely perform the forward-return rotation return even when the rotation resistance at the rear fulcrum Y increases, and is a spring for biasing the grounding body 23 to ground. What is weaker than 36 is used.

  The angle sensor 24 is covered by a resin protective cover 42 attached to the outside thereof, and a harness 43 led out from the rear end of the angle sensor 24 is guided by the protective cover 42 and guided toward the inside of the machine body. After that, it is led backwards. When the detection case 22 is in the normal detection position, the harness lead-out position of the protective cover 42 is above the rear fulcrum Y of the detection case 22, and when the detection case 22 is swung up to the retracted position and rotated. The angle sensor 24 is attached in advance to the detection case 22 so that the harness lead-out position 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 43 in the front-rear direction is reduced, and the harness 43 is not unduly twisted or pulled, thereby avoiding a disconnection accident.

  When the weeding tool 17 is vertically adjusted with respect to the support rod 16 and the weeding frame 15, the cutting height detection device A is integrally adjusted, and the ground height of the cutting device 8, that is, The cutting height is changed and adjusted. In this case, since there is no change in the height relationship between the weeding tool 17 and the grounding body 23 before and after adjustment, automatic cutting is achieved without scooping out the fallen crops by the weeding tool 17 and the digging of the weeding tool 17 into the ground. Height control is performed.

  In order to change the height of the weeding tool 17 with respect to the ground when the automatic cutting height control is in a neutral state, the reference angle to be compared with the detection angle of the angle sensor 24 is changed and adjusted with the reference angle adjuster. Good.

  10 to 12 show the attachment structure of the inrush detection device B. FIG. The supporting rod 16 of the weeding tool 17 on which the rush detection device B is provided is formed in a front-rear linear shape, and a mounting plate 17a of the weeding tool 17 is attached to the front end portion of the supporting rod 16 by two bolts 18. While being tightened and fixed from the side, the inrush detection device B is supported by the mounting plate 17a. The bolt insertion hole 17b formed in the mounting plate 17a is formed as a vertically elongated long hole that tilts backward, and the vertical position of the weeding tool 17 and the entry detection device B can be adjusted integrally within the elongated hole range. It is like that.

  The rush detection device B detects that the weed portion 17 is too close to the ground (agricultural scene) G in a grounded manner, and is a detection case 45 connected to the mounting plate 17a, and a detection case 45. And a grounding body 46 supported on the side surface of the detection case 45 so as to be swingable around a lateral fulcrum Z. The limit switch 47 is configured as a lever, and an operation shaft 49 for pressing the operation lever 47a is projected from the side surface of the detection case 45, and the grounding body 46 is connected to the projecting end so as to be integrally rotatable. Has been. As shown in FIG. 12, the grounding body 46 is disposed between a guide bar 52 and a support rod 16 that are extended in a cantilevered manner from the side surface of the mounting plate 17a to the rear side. It is possible to prevent trash and other contaminants from getting close to the grounding body 46 and tangling.

  Inside the detection case 45, a torsion spring 48 is incorporated concentrically with the operation shaft 49, and an operation arm 49a is connected to a portion of the operation shaft 49 in the case so as to be integrally rotatable, and the free end of the operation arm 49a. A switch operation pin 51 is inserted through the part. The fixed projections 50 projecting inside the detection case 45 are sandwiched between the free ends of the torsion spring 48 with initial elastic force, and the switch operation pins 51 of the operation arm 49 a are connected to the free ends of the torsion spring 48. It is sandwiched between the portions 48a and 48b.

  When both free end portions 48a and 48b of the torsion spring 48 are in a state of sandwiching the fixing protrusion 50 and the switch operating pin 51, the limit switch 47 is in an off state and the grounding body 46 is in a downward posture. From this state, when the grounding body 46 is swung back and the operation shaft 47a is rotated in the forward direction (counterclockwise in FIG. 11), the switch operation pin 51 of the operation arm 49a is turned on one side of the torsion spring 48. The free end portion 48b is moved while being pressed and deformed in the direction away from the fixed projection 50, and the operating lever 47a is pressed by the switch operating pin 51 so that the limit switch 47 is switched to the ON state.

  When the mowing unit 3 is at a height position equal to or higher than a predetermined cutting height, the grounding body 46 is in an off posture that floats up from the ground (agricultural scene) G and goes directly downward, and the support rod 16 is grounded during forward traveling. When the cutting unit 3 approaches the ground (farm scene) G until the ground is cut, the grounding body 46 is swung back and the limit switch 47 is turned on, and the cutting unit 3 is preferentially controlled to rise based on this ON signal. Thus, the weeding tool 17 is prevented from entering the ground (farm scene) G.

  When the cutting unit 3 approaches the ground (agricultural scene) G until the support rod 16 contacts the ground during reverse travel, the grounding body 46 hooked on the ground (agricultural scene) G is swung forward relatively to avoid damage. Is done. In this case, when the grounding body 46 is swung forward and the operation shaft 47a is rotated in the reverse direction (clockwise in FIG. 11), the switch operation pin 51 of the operation arm 49a is moved to the other free spring 48. The end 48a moves while being pressed and deformed in a direction away from the fixed protrusion 50. In this state, the limit switch 47 is maintained in the OFF state only by moving the switch operation pin 51 away from the operation lever 47a.

  [Another Example]

  (1) In the above embodiment, the relative height between the weeding tool 17 and the cutting height detection device A is unchanged, but the height of the cutting height detection device A can be adjusted to the mounting plate 17a of the weeding tool 17 It is also possible to implement in a form that supports the above.

  (2) Even if the grounding body 46 of the rush detection device B is swung not only backward but also forward, the limit switch 47 is switched to the on state and the ascending control is preferentially executed. it can.

Combine side view Schematic plan view of the cutting part Side view of cutting height detection device Plan view of cutting height detector Longitudinal side view of cutting height detector Longitudinal front view showing the rolling structure of the cutting height detection device Side view of cutting height detection device in reverse state Longitudinal side view of cutting height detection device in reverse state Plan view showing grounding body of cutting height detection device Side view of inrush detection device Longitudinal side view of inrush detection device Longitudinal front view of inrush detection device Side view of crawler traveling device Side view showing the connecting part of the front and rear movable track frames A plan view showing the connecting portion of the front and rear movable track frames Side view showing the attitude change operation of the movable track frame

Explanation of symbols

2 traveling machine body 3 cutting part 15 weeding frame 17 weeding tool 22 detection case 23 grounding body 23b front guide part 23c mounting base 24 angle sensor m bending point s inclined side X front fulcrum Y rear fulcrum

Claims (3)

A detection case that supports a grounding body that can swing up and down around the front fulcrum 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. In the combine cutting height detection device configured to extend the grounding body rearward and downward and swing the ground following the grounding end as a grounding point,
A weeding tool is connected to a front end portion of a weeding frame extending in a cantilevered forward direction at the lower part of the cutting part so that the height can be adjusted, and the detection case is attached to and supported by the weeding tool. The combined cutting height detection device.   The detection case is supported so that it can be retracted and rotated in the front upward direction around a rear fulcrum installed at a location behind the front fulcrum, and when moving forward, a grounding external force acting on the rear end of the grounding body is The detection case acts so as to rotate in the forward downward direction around the rear fulcrum, and a grounding external force acting on the rear end portion of the grounding body during backward movement causes the detection case to move forward in the forward direction around the rear fulcrum. The combine cutting height detecting device according to claim 1, wherein the combine cutting height detecting device is configured to act so as to rotate.   The grounding body is composed of a plate material facing in the vertical direction, the grounding body is bent upward at a position near the front end, and a front guide part having an angle of attack in front of the bending point is formed. The combine base according to claim 1 or 2, wherein a mounting base portion is formed in a vertical wall shape on one side of the front end portion of the front guide portion, and an inclined side for a crop plan is formed on the other side of the front end portion of the front guide portion. Cutting height detection device.

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