JP2009082088A - Guide unit for working implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a lightweight guide section. <P>SOLUTION: A guide unit 5 for a working implement is provided, comprising a guide section 21 constructed so as to follow guide grooves formed in a farm H as the working implement travels and an arm 23 joining the guide section 21 and the working implement's steering mechanism each other; wherein the arm 23 axially supports, in a vertically turnable way with a transversely extending first shaft 33, the guide section 21 on the working implment 1 so that the guide section 21 is followable to the vertical variations of the ground. This guide unit 5 has a cushioning mechanism 24 including a lever 46 with its lower end side turnably axially supported with a second shaft 45 transversely extending toward the guide section side off the first shaft 33, a link 49 with its one end side turnably axially supported with a third shaft 47 transversely extending toward the upper end side of the lever 46 and its other end side turnably axially supported with a fourth shaft 48 transversely extending toward the working implement side off the first shaft 33, and an impelling means 50 impelling so as to narrow the divergent angle B between the arm 23 and the lever 46 with the second shaft 45 as the center. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a guide device that automatically steers a work machine following a guide groove formed in a farm field.

  As a conventional working machine guide device, an apparatus provided in the transplanter described in Patent Document 1 is exemplified. As shown in FIG. 6, the transplanter 80 is formed in the previous step by a groove forming device (not shown) that forms a guide groove on the surface of the field H in parallel with the traveling direction of the body 85. And a guide device 90 for guiding the traveling direction of the machine body 85 along the guide groove. The guide device 90 includes a pair of front and rear abacus guide wheels 96 that roll along the guide groove as the machine body 85 advances. Moreover, the guide wheel 96 is attached to the front end side of the arm part 91 supported by the body so that rotation up and down is possible.

JP 2003-164202 A

  In the conventional guide device 90, the weight of the guide wheel 96 is set heavy in order to prevent the guide wheel 96 from being removed from the guide groove. Such a guide device 90 lifts and supports the heavy guide wheels 96 when traveling on the road, so that the fulcrum portion 91a of the arm portion 91 is stretched by the impact on the bad road. For this reason, it is necessary to make the fulcrum part 91a of the arm part 91 have a strong structure, which places a burden on the machine body 85 and is disadvantageous in terms of cost.

In order to solve the above problems, a guide device of the present invention
A guide unit that is arranged in front of the work implement to be guided and is configured to follow a guide groove formed in the field as the work implement progresses, and the work implement according to the lateral displacement of the guide unit The guide unit and an arm that connects the steering mechanism so as to control the steering mechanism of
The arm is a guide device configured to pivotally support the work unit with a first shaft extending left and right with respect to the work machine so that the guide unit can follow up and down fluctuations of the ground. There,
A lever whose lower end is pivotally supported by a second shaft that extends to the left and right of the first shaft relative to the guide shaft, and a third shaft that has one end that extends to the left and right of the upper end of the lever. A link that is pivotally supported by a fourth shaft that is pivotally supported by a fourth shaft that extends to the left and right of the work machine side relative to the first shaft, and the first shaft side of the arm and the lever. And a urging means for urging so as to reduce a relative opening angle around the second axis.

  According to this configuration, since the guide portion is biased downward by the cushion mechanism, it is possible to prevent the guide groove from being removed without increasing the weight of the guide portion. For this reason, it is possible to reduce the load on the airframe when the guide unit is lifted and supported for running on the road.

In the transplanter,
The link is exemplified by a length adjustment mechanism for adjusting the length of the link.

  According to this configuration, if the length of the link is adjusted to be longer, the force for pressing the guide portion against the ground can be increased, and if the length of the link is adjusted to be shorter The force for pressing the guide portion against the ground can be reduced. Further, if the length of the link is adjusted to be short until the guide part is lifted from the ground, it is possible to change or run on the road.

In the transplanter,
The said length adjustment mechanism illustrates the aspect which consists of a cylinder actuator which adjusts the length of the said link by expansion / contraction of a cylinder.

  Although it does not specifically limit as said cylinder actuator, An electric cylinder, a fluid pressure cylinder (for example, hydraulic cylinder) etc. are illustrated.

  According to this configuration, the length of the link can be appropriately adjusted by controlling the cylinder actuator.

  The guide device for a working machine according to the present invention has an excellent effect that the guide portion for guiding the traveling direction of the machine body along the guide groove can be reduced in weight.

  1 to 5 show an embodiment in which the present invention is embodied as a guide device for a transplanter as a working machine. As shown in FIG. 1, this transplanter 1 is for planting pot seedlings such as a plurality of strips of vegetables and flower seedlings on a field H at the same time. A riding tractor 2 and a transplanting device that is pulled and driven by the tractor 2 3 is provided. In this transplanter 1, the groove forming device 4 that forms a guide groove on the surface of the field H in parallel with the traveling direction as the transplanter 1 progresses, and the guide groove formed in the previous stroke are imitated. And a guide device 5 that automatically steers the direction of travel of the transplanter 1. In each figure, an arrow F indicates the front side of the transplanter 1.

  The tractor 2 includes a pair of left and right front wheels 13 that can be steered by a steering handle 11, a pair of left and right rear wheels 14, an airframe 15 that is supported by the front wheels 13 and the rear wheels 14, and a rear wheel. 14 and an engine 16 as a prime mover for driving the transplanting device 3 and the like.

  As shown in FIG. 5, the transplanter 3 of this example is connected to the rear part of the tractor 2 by a link mechanism 17 such as a three-point link so that it can be raised and lowered, and is pivotally supported up and down on the tractor side. And the spring means 19 connected to the tip of the restriction lever 18. And in the fixed range A (refer FIG. 5) from the lower limit position of the control lever 18, the spring means 19 acts as a tension | pulling spring, and reduces the ground pressure of the transplant apparatus 3. FIG. And in the state which rotated above this fixed range A, the spring means 19 does not act and it is comprised so that the control lever 18 may be idle. The lower limit position of the rotation of the regulating lever 18 is regulated by the tip of a stopper bolt 20 as position adjusting means, and the lower limit position is adjusted by adjusting the protruding length of the tip of the stopper bolt 20. Adjustment (i.e., load adjustment to the implantation device 3) is possible.

In this example, the reason why the transplanter 3 is supported by the restricting lever 18 and the spring means 19 from the tractor 2 to reduce the ground pressure of the transplanter 3 is as follows.
(1) This is because the transplanting device needs to suppress the surface of the field depending on the soil condition and dry state of the field (for survival after transplanting). Although some transplantation devices are equipped with a gauge ring or the like, the gauge ring is not based on the transplantation topsoil, so there is a problem that the planting state does not follow the transplantation topsoil and the planting state is poor.
(2) It is conceivable that the transplanting device 3 is directly supported by the spring means 19 from the tractor 2 without using the regulating lever 18, but the regulating lever 18 in this example becomes play. There is a problem that it is necessary to employ a large-capacity spring means 19 that acts as a tension spring even in the range, which is disadvantageous in terms of cost.

  On the other hand, in this example, the transplanting device 3 is held from the tractor 2 by the spring means 19 to reduce the ground pressure of the transplanting device 3 and is held via the regulating lever 18 to ground the transplanting device 3. Since the tension spring is mainly configured to act on the range A in which the pressure needs to be adjusted, an effect that it is not necessary to use a large-capacity spring can be obtained. Further, the adjustment of the load is facilitated by a stopper bolt 20 as a position adjusting means of the regulating lever 18.

  As shown in FIGS. 2 to 4, the guide device 5 is disposed in front of the transplanter 1 to be guided and is configured to follow a guide groove formed in the field H as the transplanter 1 advances. And an arm 23 that connects the guide unit 21 and the steering mechanism so as to control the steering mechanism (not shown) of the transplanter 1 according to the lateral displacement of the guide unit 21. And a cushion mechanism 24 for urging the guide portion 21 downward.

  In this example, the guide unit 21 includes a pair of abacus bead-shaped guide wheels 26 arranged in a line in the front-rear direction that rolls along the guide groove. The guide wheel 26 is supported in a variable direction integrally with a vertical axis 27 extending vertically. The guide portion 21 is not limited to the configuration of this example, and may be a boat-shaped member that is inserted into the guide groove and imitates the guide groove.

  The arm 23 is divided and formed into a front side portion 31 and a rear side portion 32 in the length direction, and the front side portion 31 and the rear side portion 32 are pivotally attached to each other so as to be relatively vertically rotatable by a first shaft 33 extending left and right. Thus, the guide portion 21 can follow the vertical fluctuation of the ground. The front side portion 31 is provided with a locked pin 34 as a locked portion, and the rear side portion 32 is provided with a recess 35 a for locking the locked pin 34. 35 is rotatably provided. When the locked pin 34 is locked by the recess 35a of the locking lever 35, the guide portion 21 is largely retracted upward from the ground (the guide portion 21 is further retracted upward than in FIG. 4). Yes, it can be fixed in a state where the guide unit 21 is not used, such as traveling on the road.

  The arm 23 of this example is provided with a counting means 40 for counting the number of times that the guide portion 21 has been retreated upward from the ground when it is changed (the number of times it has been brought into the state of FIG. 4). Thereby, it is possible to eliminate the trouble of counting the number of times of change, as in the case of providing a wide width for prevention every tens of changes. The counting means 40 is realized by a counter 41 that counts and displays (41a) the number of times the front side portion 31 is turned upward by a predetermined angle or more with respect to the rear side portion 32. The counter 41 is provided so that the count display 41a can be seen by an operator who has boarded the tractor 2. In this example, although it implement | achieves mechanically by connecting the count lever 41b and the rear side part 32 which increase the count value of the counter 41 provided in the front side part 31 with the rod 42, it is not limited to this. For example, an electrical switch is provided so that the front side portion 31 is turned on when the front side portion 31 is turned upward by a predetermined angle or more with respect to the rear side portion 32, and the number of times the switch is turned on is electrically counted. The count unit 40 can be appropriately changed so as to display the count value on the monitor. As for the count value displayed on the counter 41, the number of times the front side portion 31 is actually rotated upward by a predetermined angle or more with respect to the rear side portion 32 is used as the count value as it is. For example, the count value is incremented by 1 each time the value reaches a predetermined number.

  The cushion mechanism 24 has a lever 46 pivotally supported by a second shaft 45 whose lower end side extends to the left and right with respect to the guide portion side with respect to the first shaft 33, and one end side which extends to the left and right with respect to the upper end side of the lever 46. A link 49 pivotally supported by a fourth shaft 48 that is pivotally supported by a third shaft 47 and is pivotally supported by a fourth shaft 48 whose other end extends to the left and right of the transplanter side relative to the first shaft 33, and an arm The biasing means 50 (in this example, the pulling spring is biased so as to reduce the relative opening angle B (see FIG. 3) about the second shaft 45 between the first shaft side of the head 23 and the lever 46). Adopted.) The link 49 is provided with a length adjusting mechanism 51 for adjusting its length. The length adjusting mechanism 51 of this example is composed of an electric cylinder as a cylinder actuator.

  According to the guide device 5 of the transplanter 1 of the present example configured as described above, since the guide portion 21 is urged downward by the cushion mechanism 24, the guide portion 21 is guided without increasing its weight. Detachment from the groove can be prevented. For this reason, the burden of the airframe 15 when raising and supporting the guide portion 21 for traveling on the road can be reduced.

  Further, the link 49 of the cushion mechanism 24 includes a length adjusting mechanism 51 for adjusting the length of the link. Therefore, if the length of the link 49 is adjusted to be longer, the guide portion 21 is moved. The force that presses against the ground can be increased, and if the length of the link 49 is adjusted to be shorter, the force that presses the guide portion 21 against the ground can be reduced. Further, if the length of the link 49 is adjusted to be short until the guide unit 21 is lifted from the ground, it is possible to change or run on the road.

  The length adjusting mechanism 51 includes an electric cylinder as a cylinder actuator that adjusts the length of the link 49 by expansion and contraction of the cylinder. Therefore, the length of the link 49 is adjusted appropriately by controlling the electric cylinder. can do.

In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) Change the working machine to something other than the transplanter 1.
(2) Change the cylinder actuator to something other than an electric cylinder.

It is a side view which shows the transplant machine equipped with the guide apparatus which concerns on one Embodiment which actualized this invention. It is a top view of the same guidance device. It is a side view of the guidance device. It is a side view which shows the state which retracted the guide part of the guidance apparatus upwards from the ground. It is a side view which shows the connection part of the tractor and transplanting apparatus in the transplanter. It is a side view which shows the guide apparatus of the conventional transplanter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 transplanter 2 tractor 3 transplanter 4 groove making device 5 guide device 21 guide part 23 arm 24 cushion mechanism 31 front side part 32 rear side part 33 first axis 45 second axis 46 lever 47 third axis 48 fourth axis 49 link 50 Biasing means 51 Adjustment mechanism B Opening angle H Field

Claims (3)

A guide unit that is arranged in front of the work implement to be guided and is configured to follow a guide groove formed in the field as the work implement progresses, and the work implement according to the lateral displacement of the guide unit The guide unit and an arm that connects the steering mechanism so as to control the steering mechanism of
The arm includes a working machine configured to pivotally support the guide unit with a first shaft extending left and right with respect to the work machine so that the guide unit can follow up and down fluctuations of the ground. A guidance device,
A lever whose lower end is pivotally supported by a second shaft that extends to the left and right of the first shaft relative to the guide shaft, and a third shaft that has one end that extends to the left and right of the upper end of the lever. A link that is pivotally supported by a fourth shaft that is pivotally supported by a fourth shaft that extends to the left and right of the work machine side relative to the first shaft, and the first shaft side of the arm and the lever. A working machine guide device having a cushion mechanism including a biasing means for biasing so as to reduce a relative opening angle about the second axis between the two.   The work device guide device according to claim 1, wherein the link includes a length adjusting mechanism for adjusting a length of the link.   The work machine guide device according to claim 2, wherein the length adjusting mechanism includes a cylinder actuator that adjusts a length of the link by expansion and contraction of a cylinder.

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