JP2005198522A - Controller for plowing depth of mobile agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the vertical rotation of a rear cover with a detecting switch mounted on a hitch apparatus. <P>SOLUTION: A controller for the plowing depth of a mobile agricultural machine is composed as follows. A rotary implement 26 is freely liftably and lowerably supported through the hitch apparatus 24 at the rear of the tractor body 10 and a rotary cover 46 is mounted so as to cover tillage tines 39 of the rotary implement 26 and freely move around the tillage tines 39. The rear cover 48 for detecting the tillage depth is freely vertically rotatably pivoted on the rotary cover 46. A detecting sensor 94 for detecting the movement of the rear cover 48 based on the movement of the rotary cover 46 is mounted on the hitch apparatus 24. The location of the rear cover 48 in a puddling position can be detected with the detecting sensor 94. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention connects a rotary work machine to a hitch device connected to a main body of an agricultural machine such as a tractor via a link mechanism, detects a tilling depth by a rear cover pivotally supported by the rotary work machine, and uses the rotary work machine. The present invention relates to a plowing depth control device for a mobile agricultural machine that performs elevation control.

  Conventionally, when a rotary work machine is connected to a mobile agricultural machine such as a tractor, a hitch device is connected to the rear part of the mobile agricultural machine via a three-point link mechanism having a top link and a pair of left and right lower links, and the top connected to this hitch device. And a pair of left and right lower connecting portions, and a rotary work machine is mounted via the upper connecting portion and the lower connecting portion. A rear cover for detecting the tilling depth is pivotally mounted on the rear part of the rotary working machine, and the vertical turning amount of the rear cover is arranged between the rotary working machine and the hitch device. A device that transmits to the agricultural machine main body side by a link mechanism is known (see, for example, Patent Document 1 and Patent Document 2).

JP-A-7-170807 (page 3, FIG. 3) Japanese Utility Model Publication No. 3-126403 (first page, FIG. 5)

  However, as in the prior art described in Patent Document 1 and Patent Document 2 described above, when the rotary work machine is connected to a so-called hitch device, the vertical rotation amount of the rear cover is also transmitted to the agricultural machine body side. In the above-described link mechanism, a large number of shafts in the link portion and holes for fitting the shafts are required in the link mechanism described above, so errors due to accumulated hole play occur, and the amount of tillage depth detected can be increased with high accuracy. It is difficult to transmit to the control unit, and thus it is difficult to perform highly accurate tillage control.

  The present invention has been made to solve such a problem, and an object thereof is to provide a plowing depth control device for a mobile agricultural machine that can accurately detect the movement of the rear cover by a detection sensor attached to the hitch device. Is to provide.

In order to achieve the object, the invention according to claim 1 includes a rotary working machine (26) supported by a hitch device (24) attached to an agricultural machine main body (10) so as to be movable up and down, and the rotary working machine (26 ) And a rotary cover (46) that is movable around the tillage part (39) and is pivotally supported by the rotary cover (46) so as to be rotatable up and down to detect the tillage depth. A plowing depth control device for a mobile agricultural machine, comprising:
A detection sensor (94) for detecting the movement of the rear cover (48) based on the movement of the rotary cover (46) is attached to the hitch device (24).

The invention according to claim 2 is the plowing depth control device for a mobile agricultural machine according to claim 1,
A front cover (76) pivotally supported by the rotary work machine body (26) and moving based on the movement of the rotary cover (46) is provided, and the detection sensor (94) is provided based on the movement of the front cover (76). It operates.

  In addition, the code | symbol in parenthesis mentioned above is for referring drawings, Comprising: This invention is not limited at all.

  According to the invention of claim 1, since the detection sensor for detecting the movement of the rear cover based on the movement of the rotary cover that covers the tillage part of the rotary working machine is attached to the hitch device attached to the main body of the agricultural machine, the detection sensor Thus, the moving position of the rotary cover can be automatically detected, and therefore it can be grasped that the rotary cover has moved to a desired position in accordance with, for example, switching of the work mode.

  According to the second aspect of the present invention, the front cover that moves based on the movement of the rotary cover is provided, and the detection sensor is operated based on the movement of the front cover. It is possible to reliably detect the moving position of the rotary cover by attaching it at an arbitrary position so as not to become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are side views of a state in which a rotary working machine is mounted on the rear portion of the tractor body via a hitch device (standard tillage work state and alternative tillage work state), and FIG. 3 is a plan view thereof. In FIG. 1 to FIG. 3, a top link support 13 is attached to the rear upper portion of the mission case 11 in the tractor body 10 via a top link bracket 12, and a top link 14 is attached to the top link support 13. A pair of left and right lower links 16, 16 are disposed below the top link bracket 12, and a PTO shaft 18 protrudes rearward above the lower link 16. The top link 14 and the pair of left and right lower links 16 and 16 constitute a three-point link mechanism. The lower link 16 is connected to a lift arm 20 driven by hydraulic pressure through a lift rod 22 so as to be movable up and down. ing.

  A hitch device 24 is connected to the rear end of the top link 14 and the pair of left and right lower links 16, 16, and a rotary work machine 26 is connected to the hitch device 24 so as to be detachable and liftable. Further, the PTO shaft 18 of the tractor body 10 and the input shaft 28 of the rotary work machine 26 are splined via a joint port 33 (see FIG. 8) of a joint holder 32 that holds the yoke joint 30 and the rear end side thereof. Has been.

  The rotary work machine 26 has support arms 35R, 35L extending in the left-right direction from the gear case 34, and the input shaft 28 projecting forward. A chain case is provided at the left and right ends of the support arms 35R, 35L. 36 and a side plate 37 are fixed, and a tilling shaft 38 is rotatably supported at the lower part of the chain case 36 and the side plate 37. A plurality of tilling claws 39 as a tilling portion are attached to the tilling shaft 38. Yes. A top mast 40 is fixed to the upper portion of the gear case 34, and an adjusting device 44 for adjusting the vertical position of a tool bar 42 on which a tail wheel or a vertical machine is mounted is provided behind the top mast 40. Further, a mid cover 47 is pivotally mounted on the rear portion of the rotary cover 46 covering the tilling shaft 38, and a rear cover 48 is pivotally supported (49) on the rear portion of the mid cover 47 so as to be rotatable up and down. ing. A suspension rod 71 is attached to the mid cover 47, and a rear cover 48 is suspended and supported by the suspension rod 71.

  The rear cover 48 detects the depth of tilling by the rotary working machine 26. The amount of vertical rotation of the rear cover 48 is transmitted to the hydraulic control valve 23 on the tractor body 10 side, and the rotary working machine 26 is driven by a hydraulic actuator (not shown). Controlled up and down.

  The top mast 40 is disposed adjacent to the left and right sides, and a link arm 72 is disposed between the left and right top masts 40 so as to be pivotable back and forth about a shaft 72a. An operating lever is disposed on the shaft 72a. 73 is fixed. Further, the link arm 72 and the rotary cover 46 are connected by a rod 74 so that the rotary cover 46 can be rotated back and forth and positioned by operating the operation lever 73. A front cover 76 is attached to the front portion of the rotary cover 46 to prevent muddy water from splashing on the control section. That is, the shaft 77 fixed to the front cover 76 is pivotally supported by the mounting plate 36 a extending from the chain case 36 and the mounting plate 37 a extending from the side plate 37. On the other hand, rollers 78 and 78 are pivotally supported on the left and right sides of the rear portions of the side plates 76a and 76a integrated with the front cover 76, and the rollers 78 roll on the front upper ends of the side plates 46a of the rotary cover 46. By being elastically pressed against the upper end surface of the side plate 46a by the torsion spring 80, when the rotary cover 46 rotates, the side plate 46a performs a cam action, and the front cover 76 rotates up and down.

  Further, a mast pin 50 and a lock pin 52 used for connection with the hitch device 24 are provided on the upper and lower portions of the rotary working machine 26.

  The hitch device 24 includes a hitch frame 54 in which a round pipe is formed in a substantially inverted U shape, and a mast pin 50 that is integrally fixed to the upper portion of the hitch frame 54 and provided on the top mast 40 of the rotary work machine 26. Are connected to the upper connecting portion 56 for fitting and supporting the left and right via a connecting rod 51 (see FIG. 8) at the lower portion of the hitch frame 54 and connect the pair of left and right lock pins 52, 52 of the rotary work machine 26. A pair of lower connecting portions 57, 57. As shown in FIG. 8, a pair of left and right holding plates 53, 53 are integrally fixed to the connecting rod 51 at a substantially intermediate portion in the longitudinal direction. Support pins 55 and 55 for supporting the joint holder 32 from below are attached.

  The upper connecting portion 56 includes a mounting hole 56a for the top link 14 formed at the front portion thereof, a substantially U-shaped hook portion 56b formed at the rear portion, and an L-shaped groove 56c formed at the lower portion. have. The lower connecting portion 57 is formed with a substantially U-shaped opening (not shown) facing rearward, and the lower connecting portion 57 has a hook plate 58 for hooking the lock pin 52. Is pivotally attached to open and close. The hook plate 58 can lock and unlock the lock pin 52 by operating the release link 59.

  In this embodiment, as shown in FIG. 4, the push-pull wire 60 that extends from the rear cover 48 side and transmits the vertical rotation amount of the rear cover 48 to the connecting portion 162 of the rotary work machine 26 and the hitch device 24 are provided. In accordance with the mounting / demounting operation of the rotary work machine 26, a tilling depth transmission means 61 is provided for connecting and separating transmission of the vertical rotation amount of the rear cover 48 between the connecting portion and the hitch device 24.

  The tillage depth transmission means 61 is attached to the support fitting 62 disposed in the connection portion 162 of the rotary work machine 26 and one end (on the connection portion 162 side) of the push-pull wire 60 and rotates to the support fitting 62. It has a connecting metal 63 that is pivotally attached, and a sensor link 64 that is rotatably disposed on the hitch device 24 so as to face the connecting metal 63. Further, as shown in FIGS. 5A and 5B, the sensor link 64 is constantly urged by a torsion coil spring 65 in a direction approaching the connection fitting 63.

  That is, the push-pull wire 60 has an outer wire 60a and an inner wire 60b, and one end of the outer wire 60a is attached to a support fitting 62 that is integrally fixed to a support arm 35L that extends leftward from the gear case 34. The other end of the outer wire 60 a is fixed to the mid cover 47 via a metal fitting 66. One end and the other end of the outer wire 60a are covered with bellows 96, 95, respectively, and the bellows 96, 95 prevent intrusion of mud or the like. Further, one end of the inner wire 60 b is pivotally attached to the distal end side of the connection fitting 63 via the connection tool 68, and the other end of the inner wire 60 b is fixed to the upper portion of the rear cover 48.

  As shown in FIGS. 5 to 8, the support metal fitting 62 has a support bracket 62a and a fixing metal fitting 62b fixed to the support bracket 62a with a bolt. The connecting fitting 63 is pivotally attached so as to be swingable. In addition, a sensor link 64 is disposed so as to face the coupling metal 63. The sensor link 64 is pivotally attached to a base bracket 81 fixed to a holding plate 53 (see FIG. 8) of the hitch device 24 so as to be rotatable about a shaft 82.

  That is, a bracket 83 having a substantially U-shaped cross section is fixed to the base bracket 81 by a bolt 84, and the shaft 82 is attached to the bracket 83 via a collar 85 and a bolt 86. 64 is pivotably mounted. The sensor link 64 is substantially L-shaped with the rotation center side supported by the shaft 82, and a collar 88 is rotatably attached to the end of the long piece 64a by a support pin 87. 64b is curved. The sensor link 64 is always urged by the torsion coil spring 65 in the direction approaching the connecting metal 63, and the distal end side of the short piece 64b is in contact with the base bracket 81 and is restricted from rotating.

  Further, a potentiometer (detection sensor) 89 is disposed on substantially the same axis as the shaft 82, and a detection shaft (not shown) of the potentiometer 89 is connected to the sensor link 64 via a connecting piece 90. Are combined. A signal line 91 is extended from the potentiometer 89. As a result, when the sensor link 64 rotates about the shaft 82, the connecting piece 90 in contact therewith also rotates, and the amount of rotation is detected by the potentiometer 89. The amount of rotation of the rear cover 48 detected by the potentiometer 89 is converted into an electric signal, transmitted to the hydraulic control valve 23 via a control unit (not shown) via a signal line 91, and rotated by a hydraulic cylinder (not shown). The machine 26 is controlled to move up and down.

  By the way, in this embodiment, as shown in FIGS. 4 and 8, a mounting plate 93 is welded and fixed to the connecting rod 51 of the hitch device 24, and a detection switch 94 is attached to the mounting plate 93 with a bolt or the like. It has been. On the other hand, the detection plate 97 is fixed to the front cover 76, and when the rotary cover 46 and the rear cover 48 are rotated to the scraping position (rear side of the apparatus), the roller 78 supported by the front cover 76 is rotated. As a result of rolling the side plate 46a of 46, the front cover 76 rotates forward as shown in FIG. 2, and the detection plate 97 fixed to the front cover 76 contacts the detection switch 94 and pushes the switch.

  As a result, when it is detected that the rear cover 48 is in the scraping position, the control unit (not shown), for example, slows the lifting speed of the rotary work machine 26 so that it does not react sensitively to the operation of the rear cover 48 ( The control sensitivity is dulled), and the hunting operation of the rotary working machine 26 can be prevented.

  According to the present embodiment, the position of the rear cover 48 can be automatically detected by the detection switch 94, and it is possible to reliably grasp that the work mode has been switched. In addition, the detection switch 94 can be disposed near the potentiometer 89, and an arbitrary position that does not interfere with other mechanism portions can be selected, so that a compact design can be performed. Furthermore, the manufacturing cost can be reduced with a simple structure.

  FIG. 1 shows a standard tillage work state, and FIG. 2 shows an alternative tillage work state. That is, in the standard tillage work state of FIG. 1, the rotary cover 46 is rotated to the front side of the apparatus, and at this time, the rear cover 48 is raised with respect to the farm scene. Further, the roller 78 of the front cover 76 is positioned near the front and rear intermediate portions of the rotary cover 46, and the front cover 76 is in a slightly upward posture with the shaft 77 as the center. For this reason, in this state, the detection plate 97 fixed to the front cover 76 does not contact the detection switch 94.

  On the other hand, in the scraping work state of FIG. 2, the rotary cover 46 is rotated to the rear side of the apparatus, and at this time, the rear cover 48 is lowered with respect to the farm scene. Further, the roller 78 of the front cover 76 is positioned near the front portion of the rotary cover 46, and the front cover 76 has a slightly forward-down posture with the shaft 77 as the center. For this reason, as shown in FIG. 4, the detection plate 97 fixed to the front cover 76 contacts the detection switch 94, and the detection switch 94 is pushed to be in the ON operation state. Then, a detection signal indicating the scraping state at this time is sent to a control unit (not shown), and the vertical movement of the lift arm 20 is slightly less than the standard tillage work state with respect to the rotation amount of the rear cover 48, and the rotary work machine 26 It is controlled so that stable scraping work can be performed.

  Next, FIG. 9 thru | or FIG. 13 shows other embodiment, The same code | symbol is attached | subjected to the member which is the same as that of embodiment mentioned above, or it corresponds, and the description is abbreviate | omitted.

  In this embodiment, a sensor link 64 ′ is used instead of the sensor link 64, and a base bracket 81 ′ is used instead of the base bracket 81. As shown in FIGS. 10 and 11, the sensor link 64 ′ has arms 64a ′ and 64b ′ protruding substantially symmetrically about a hole (not shown) in which the pin 67 is mounted. A contact portion 64c ′ is formed at the tip of one arm 64a ′, and a mounting hole (not shown) for the mounting pin 69 and the spring mounting pin 70 is formed in the other arm 64b ′. One end of the inner wire 60b 'of the push-pull wire 60' is fixed to the mounting pin 69, and the spring mounting pin 70 and the base bracket 81 are fixed to the contact portion 64c '. A spring 92 that urges the sensor link 64 ′ toward the connecting metal fitting 63 side is stretched between the two.

  In the above, for example, when the rear cover 48 is rotated upward with respect to the field scene, the connecting metal 63 comes into contact with the contact portion 64c ′ of the sensor link 64 ′ via the push-pull wire 60, and the corresponding contact portion 64c ′ When pressed, the sensor link 64 ′ rotates about the shaft 82 ′ in the clockwise direction of FIG. 10 (see the two-dot chain line). Accordingly, the other arm 64b 'paired with one arm 64a' also rotates clockwise about the shaft 82 'against the biasing force of the spring 92, and the inner wire 60b' is pulled. By pulling the inner wire 60b ', the pulling amount is transmitted to the hydraulic control valve 23, and the rotary working machine 26 is controlled to be raised and lowered by a hydraulic cylinder (not shown). Other configurations are the same as those of the above-described embodiment.

It is a side view of the state (standard tillage work state) which connected the rotary working machine to the tractor. FIG. 3 is a side view of a state in which a rotary working machine is connected to a tractor (a state of alternative tillage work state). It is a top view of a rotary working machine. It is a principal part side view of the state (crawler plowing work state) which connected the rotary working machine to the tractor. (A) is the expanded partial side view in the same as the above, (b) is the side view. It is a top view same as the above. FIG. 5 is a plan view of FIG. 4. It is the figure which looked at the hitch device of Drawing 4 from back. It is a principal part side view of other embodiment of the state which connected the rotary working machine to the tractor. It is a principal part side view of FIG. It is a principal part top view of FIG. FIG. 10 is a plan view of FIG. 9. It is the figure which looked at the hitch device of Drawing 9 from back.

Explanation of symbols

10 Tractor body 14 Top link (link mechanism)
16 Lower link (link mechanism)
24 hitch device 26 rotary working machine 39 tillage claw (cultivation part)
46 Rotary cover 48 Rear cover 76 Front cover 94 Detection switch 97 Detection plate

Claims (2)

A rotary working machine supported by a hitch device attached to the main body of the agricultural machine so as to be movable up and down, a rotary cover that covers the cultivating part of the rotary working machine and is movable around the cultivating part, and pivots up and down on the rotary cover In a plowing depth control device for a mobile agricultural machine, comprising a rear cover that is pivotally supported and detects a plowing depth,
A detection sensor for detecting movement of the rear cover based on movement of the rotary cover is attached to the hitch device.
A plowing depth control device for a mobile agricultural machine. A front cover that is pivotally supported by the rotary work machine body and moves based on the movement of the rotary cover, and the detection sensor is activated based on the movement of the front cover;
The plowing depth control apparatus for a mobile agricultural machine according to claim 1.

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