JP2005198521A - Controller for plowing depth of mobile agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit the extent of vertical rotation of a rear cover to a control part with high accuracy according to mounting and demounting operation of a hitch apparatus on a rotary implement. <P>SOLUTION: A controller for the plowing depth of a mobile agricultural machine is composed as follows. The rotary implement 26 is freely liftably and lowerably supported through the hitch apparatus 24 at the rear of the tractor body 10 and the rear cover 48 is freely vertically rotatably pivoted on the rotary implement 26. The extent of the vertical rotation of the rear cover 48 is transmitted to a hydraulic control valve 23 on the side of the tractor body 10 so that the rotary implement 26 is freely liftably and lowerably controlled. Thereby, a connecting metal fixture 63 is brought into contact with a sensor link 64 according to the connection of the rotary implement 26 to the hitch apparatus 24. The sensor link 64 is moved integrally with the connecting metal fixture 63 under a contact pressure to transmit the shift through a push pull wire 60 to the hydraulic control valve 23. The connecting metal fixture 63 is separated from the sensor link 64 according to the separation of the rotary implement 26 from the hitch apparatus 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  Conventionally, when a work machine is connected to a mobile farm machine such as a tractor, a hitch device is connected to the rear part of the mobile farm machine via a three-point link mechanism having a top link and a pair of left and right lower links, and the upper connection unit And a pair of left and right lower connection portions, and the work implement is mounted via the upper connection portion and the lower connection portion. A rear cover for detecting the tilling depth is pivotally attached to the rear part of the working machine, and the vertical turning amount of the rear cover is set between the 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 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-mentioned link mechanism, a large number of shafts in the link portion and holes for fitting the shafts are required, so errors due to accumulated hole play occur, and the amount of tillage depth detected can be controlled with high accuracy. It is difficult to transmit to the section, and thus it is difficult to perform highly accurate tillage control.

  The present invention has been made to solve such a problem, and the object of the present invention is to reduce the vertical rotation amount of the tilling depth detection plate with a simple structure in accordance with the operation of attaching and detaching the work machine to and from the hitch device. It is providing the plowing depth control apparatus of the mobile agricultural machine which can be transmitted to a control part with high precision.

In order to achieve the object, the invention according to claim 1 attaches a hitch device (24) to the agricultural machine main body (10) via a link mechanism (14, 16) and attaches the hitch device (24) to a work machine (26 ), And the work implement (26) has a tilling depth detection plate (48) that is pivotally supported by the work implement main body so as to be pivotable up and down and detects the tilling depth. In the plowing depth control device for a mobile agricultural machine that transmits the vertical rotation amount of the hydraulic machine) to the hydraulic control valve (23) on the agricultural machine main body side and controls the working machine (26) to be moved up and down by a hydraulic actuator.
A wire member (60) extending from the plowing depth detection plate (48) side and transmitting a vertical rotation amount of the plowing depth detection plate (48) to a connecting portion (162) of the work implement (26); Plowing depth transmission means for connecting / disconnecting the transmission of the vertical rotation amount between the connecting portion (162) and the hitch device (24) in accordance with the attaching / detaching operation of the work implement (26) to the device (24). 61), and
The tillage depth transmitting means (61) is attached to one end of the support member (62) disposed in the connecting portion (162) and the wire member (60), and is movable to the support member (62). The connecting means (63) provided, the sensor link (64, 64 ') provided to the hitch device (24) so as to be opposed to the connecting means (63), and the sensor link (64) , 64 ′) and a biasing member (65) that constantly biases the connecting means (63) in a direction approaching the connecting means (63),
As the work implement (26) is connected to the hitch device (24), the connecting means (63) comes into contact with the sensor link (64, 64 ′) and the sensor link (64, 64 ′) due to the corresponding contact pressure. ) Moves integrally with the connecting means (63) and transmits the amount of movement to the hydraulic control valve (23) via the amount of movement transmitting means,
When the work implement (26) is detached from the hitch device (24), the connecting means (63) is detached from the sensor link (64, 64 ′).

  According to a second aspect of the present invention, in the plowing depth control device for a mobile agricultural machine according to the first aspect, the movement amount transmitting means connects the sensor link (64 ') and the hydraulic control valve (23) side. It is the other wire member (60 ') arrange | positioned so that it may be characterized by.

  According to a third aspect of the present invention, in the plowing depth control apparatus for a mobile agricultural machine according to the first aspect, the movement amount transmitting means detects a movement amount of the sensor link (64) and sends the detection signal to the hydraulic control valve. It is a detection sensor (89) which transmits to (23), It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the plowing depth control device for a mobile agricultural machine according to the second or third aspect, when the other wire member (60 ') is used and when the detection sensor (89) is used. The attachment position and the movement amount of the sensor link (64, 64 ') are substantially constant.

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

  According to the first aspect of the present invention, the tillage depth transmitting means includes a support member disposed at the connection portion of the work implement, and a connection attached to one end of the wire member and movably disposed on the support member. Means, a sensor link that is movably disposed in the hitch device so as to face the connecting means, and a biasing member that constantly biases the sensor link in a direction approaching the connecting means. Is connected to the hitch device, the connecting means comes into contact with the sensor link, and the sensor link moves integrally with the connecting means by the corresponding contact pressure, and the movement amount is transferred to the hydraulic pressure via the movement amount transmitting means. When the work implement is detached from the hitch device, the connection means is detached from the sensor link, thereby sensing the vertical rotation amount of the tilling depth detection plate on the work implement side. Highly accurate transmission to the agricultural machine body Rukoto can. In addition, there is no possibility that the link mechanisms interfere with each other, and since it has a simple structure, it can be manufactured at low cost. Furthermore, since the transmission of the vertical rotation amount of the tilling depth detection plate can be connected and separated in conjunction with the attachment / detachment of the work implement to / from the hitch device, the operability can be improved.

  According to the second aspect of the present invention, the movement amount transmission means is another wire member disposed so as to connect the sensor link and the hydraulic control valve side. The amount of movement can be detected as a mechanical displacement with high accuracy.

  According to the third aspect of the present invention, the movement amount transmitting means is a detection sensor that detects the movement amount of the sensor link and transmits the detection signal to the hydraulic control valve. Can be detected with high accuracy.

According to the invention according to claim 4, the attachment position and the movement amount of the sensor link are substantially constant between the case of using another wire member and the case of using the detection sensor.
It will be compatible with mobile agricultural machines of different specifications, and the vertical rotation amount of the tilling depth detection plate can be detected with high accuracy using the other wire member or by the detection sensor.

  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 working 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 the 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, and a plurality of tilling claws 39 are attached to the tilling shaft 38. 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 (plowing depth detecting plate) 48 is pivotally movable on the rear portion of the mid cover 47. It is pivotally supported (49). 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.

  Here, in the present embodiment, as shown in FIG. 4, a push-pull wire (wire member) 60 that extends from the rear cover 48 side and transmits the amount of vertical rotation of the rear cover 48 to the connecting portion 162 of the rotary work machine 26. Further, a plowing depth transmission means 61 is provided for connecting and disconnecting the amount of vertical rotation of the rear cover 48 between the connecting portion 162 and the hitch device 24 as the rotary work machine 26 is attached to and detached from the hitch device 24. .

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

  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.

  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)
23 Hydraulic control valve 24 Hitch device 26 Rotary work machine 39 Tillage claw 46 Rotary cover 48 Rear cover (plowing depth detection plate)
60 Push-pull wire (wire member)
60 'push-pull wire (wire member)
61 Plowing depth transmission means 62 Support metal fitting 63 Connection metal fitting (connection means)
64 Sensor link 64 'Sensor link 65 Torsion coil spring 89 Potentiometer (detection sensor)
162 connecting part

Claims (4)

A hitch device is attached to the main body of the agricultural machine via a link mechanism, and a work machine is connected to the hitch device. In a plowing depth control device for a mobile agricultural machine that has a plate, transmits the amount of vertical rotation of the plowing depth detection plate to a hydraulic control valve on the agricultural machine main body side, and controls the working machine up and down by a hydraulic actuator,
A wire member extending from the plowing depth detection plate side and transmitting the amount of vertical rotation of the plowing depth detection plate to the connecting portion of the work implement; and the connecting portion in accordance with the attaching / detaching operation of the work implement to the hitch device Plowing depth transmission means for contacting and separating the transmission of the vertical rotation amount with the hitch device,
The tillage depth transmitting means includes a support member disposed at the connection portion, a connection means attached to one end of the wire member and movably disposed on the support member, and opposed to the connection means. A sensor link movably disposed in the hitch device, and a biasing member that constantly biases the sensor link in a direction approaching the connecting means,
As the work implement is connected to the hitch device, the connecting means comes into contact with the sensor link, and the sensor link moves integrally with the connecting means by the corresponding contact pressure, and the moving amount is transferred to the moving amount transmitting means. To the hydraulic control valve via
With the detachment of the work implement from the hitch device, the connecting means detaches from the sensor link.
A plowing depth control device for a mobile agricultural machine. The movement amount transmission means is another wire member arranged to connect the sensor link and the hydraulic control valve side.
The plowing depth control apparatus for a mobile agricultural machine according to claim 1. The movement amount transmitting means is a detection sensor that detects a movement amount of the sensor link and transmits a detection signal to the hydraulic control valve.
The plowing depth control apparatus for a mobile agricultural machine according to claim 1. In the case where the other wire member is used and the case where the detection sensor is used, the attachment position and the movement amount of the sensor link are made substantially constant.
The plowing depth control apparatus for a mobile agricultural machine according to claim 2 or 3.

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