JPH053242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device for controlling the elevation of running wheels in paddy field working machines such as rice transplanters, seeding machines, and fertilizer applicators.

[Prior art and problems to be solved by the invention] Generally, in this type of paddy field working machine, a pair of running wheels are provided which are independently suspended on the left and right sides of the machine body, and both running wheels are connected to both the left and right ends. The lever arm is moved back and forth in parallel by the operation of the lifting control device to cause both wheels to move up and down in the same direction, and by the operation of the horizontal control device, it is horizontally swung to move the wheels up and down in opposite directions. The aircraft is controlled so that its attitude remains approximately constant with respect to the rice field. Among these devices, there is one in which the horizontal control device is configured to actively cause the balance arm to horizontally swing by the expansion and contraction operation of a hydraulic cylinder, as shown in Japanese Patent Publication No. 58-22163, for example. However, in this device, the horizontal control device using a hydraulic cylinder is interposed between the cylinder rod of the hydraulic cylinder constituting the elevation control device and the balance arm, so when controlling the attitude of the aircraft, the hydraulic cylinder for elevation control is As a result, there is a risk that the expansion and contraction operation of the hydraulic cylinder for lifting control will not be carried out smoothly. There are disadvantages such as the need to use a large hydraulic cylinder.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a lifting control device for running wheels in a paddy field working machine that can eliminate these drawbacks. A balance arm, which is connected to the end of each of the left and right running wheels provided on the main body of the aircraft, is swingably pivoted to the end of a rod of an elevation control cylinder that is displaced in the front and back direction, and the running wheels are connected to each other. In the paddy field work machine, the above-mentioned paddy field work machine is configured to perform simultaneous lifting and lowering by integral back and forth movement of the balance arm by cylinder operation, and reverse lifting and lowering by swinging around the pivot of the balance arm as a fulcrum. A slide holder equipped with a horizontal control device is supported slidably in the front and rear directions on a guide bar provided on the side of the main body of the aircraft, and an operating arm connected to the horizontal control device is integrally provided on the balance arm, and the slide holder is equipped with a horizontal control device. The present invention is characterized in that a pivot arm integrally extended from the holder is swingably pivoted toward the balance arm at a substantially coaxial position with the pivot shaft of the balance arm.

With this configuration, the present invention can reliably prevent the bending load from the horizontal control tool for horizontally swinging the balance arm from being applied to the elevation control tool.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is the body of a walking rice transplanter, and at the bottom of the body frame 2 of the body 1, the rear part is pivoted on a support shaft 3a, and the front part is movable up and down by a link 3b. A center float 3 is provided, and a driving handle 4 is provided at the rear end of the fuselage frame 2 so as to protrude rearward and upward. A platform 5 is provided. Further, an engine 6 is mounted on the front part of the fuselage frame 2, and an upper rear portion of a transmission case 7 arranged at the rear of the engine 6 has a
An elevation control valve 9 to which an oil path from a hydraulic pump is interlocked and connected is integrally provided. The lift control valve 9 and the link pivot portion of the center float 3 are interlocked and connected via a sensing rod (not shown), so that the center float 3 can be vertically oscillated due to changes in the unevenness of the tiller. The elevation control valve 9 is switched in conjunction with the above. 1
Reference numeral 2 denotes a lift control cylinder protruding rearward from the lift control valve 9, and the lift control cylinder 12 is configured such that a cylinder rod 12a extending and retracting from the cylinder tube extends and contracts toward the rear of the aircraft body. Although the cylinder rod 12a is
A sliding piece (corresponding to the piece body of the present invention) 10 is fitted into the tip (rear end) of the slide piece 10 so as to be slidable in the axial direction while being pressed backward by the ammunition 10a.

Further, a plate body 13 is integrally fixed to the rear surface of the transmission case 7, and a lift control cylinder 12 is installed between the plate body 13 and a support bracket 14 installed upright on the fuselage frame 2. A pair of guide bars 15 are integrally provided so as to be sandwiched from the left and right sides. A slide holder 16 is assembled and supported on the guide bar 15 so as to be slidable in the front and rear directions. Between the left and right mounting arms 16a of this slide holder 16 is a cylinder rod 17 of a horizontal control cylinder 17 constituting a horizontal control tool.
Both ends of a are integrally supported. This horizontal control cylinder 17 is of a double-acting type, and
The cylinder tube 17b is moved in the left-right direction by oil supply from the horizontal control hydraulic valve 18. Furthermore, a pivot arm 16b is integrally provided on the upper surface of the slide holder 16 and extends toward the balance arm 19 at the rear. The balance arm 19 is formed by laminating two upper and lower plates, and the center portion of the balance arm 19 is swingable about a pivot 10b provided above and below the sliding piece 10. The balance arm 19 is pivotably supported, so that the balance arm 19 is configured to be horizontally swingable in the left-right direction.

Furthermore, an actuating arm 19b is integrally formed forward on the upper surface of the central portion of the balance arm 19, and the distal end portion of the actuating arm 19b that overlaps with the lower surface of the slide holder 16 has a longitudinal length. Hole-shaped accommodation hole 1
9c is drilled. Further, a pin shaft 19d is protruded from the base end of the operating arm 19b at a position substantially coaxial with the pivot shaft 10b of the sliding piece 10 (this pin shaft 19d may be integrated with the pivot shaft 10b if necessary). can). A pivot arm 16b extending from the slide holder 16 mentioned above is attached to this pin shaft 19d.
The tip of the is pivotably supported. On the other hand, the actuating pin 17c protruding from the cylinder tube 17b is
It passes through a left-right guide 16c and a flexible hole 19c bored in the slide holder 16. Then, by controlling the operation of the hydraulic valve 18, the cylinder tube 1
When the arm 7b moves left and right, the moving arm 17c causes the arm 19b to move towards the pivot arm 16b.
The balance arm 19 is forcibly oscillated about the pin shaft 19d as a fulcrum, thereby causing the balance arm 19 to oscillate horizontally. Then, the actuating rod 2 is connected to the left and right ends of the balance arm 19.
0. The running wheels 23, which are interlocked and connected via the swing arm 21 and the swing case 22, are moved up and down in a contradictory manner to control the left and right horizontal posture of the aircraft body. In addition, the switching operation of the hydraulic valve 18 is carried out by sensing floats 24 placed on the left and right front parts of the center float 3, which are interlocked and connected to the hydraulic valve 18 via links (not shown), and detect irregularities in the left and right tillers. When the float 24 senses this, the hydraulic valve 18 is switched in response to this, and the machine is controlled so that the left and right horizontal attitude of the machine body is kept substantially constant with respect to the rice field. Further, 25 is a pipe connecting the hydraulic valve 18 and the horizontal control cylinder 17.

In the embodiment of the present invention configured as described above, the planted seedlings placed on the seedling platform 5 are scraped off and placed on the rice field by the planting operation of the planting claw P that is timed with the movement of the main body. During this kind of planting run, if the machine body tries to change back and forth due to changes in the unevenness of the tiller, the center float 3 senses this and lifts and lowers accordingly. When the control valve 9 is switched, the lift control cylinder 12 expands and contracts back and forth to move the sliding piece 10 back and forth, thereby moving the balance arm 19 in parallel in the front and back direction, and moving the running wheels 23 from side to side. Simultaneous lifting and lowering control is performed so that the front-back attitude of the aircraft remains approximately constant with respect to the rice field. At this time, the slide holder 16, which is interlocked and connected via the pivot shaft 10b, moves together with the horizontal control cylinder 17, following the balance arm 19 and being guided by the guide bar 15. On the other hand, when the sensing float 24 senses the unevenness of the left and right tillers, the horizontal control hydraulic valve 1
8 is switched, and the cylinder tube 17b of the horizontal control cylinder 17 moves left and right. Then, the operating arm 19b swings about the pin shaft 19d, and the balance arm 19 also swings horizontally about the pivot shaft 10b, thereby controlling the vertical movement of the left and right wheels 23 in opposite directions. As a result, the left and right attitude of the aircraft is controlled to be approximately constant with respect to the rice field.

As described above, in the present invention, the left and right traveling wheels 23 are controlled to move up and down in the same direction or in opposite directions simultaneously by the sensing operation of the center float 3 and the sensing float 24, and the attitude of the aircraft is controlled. It is possible to perform orderly and highly accurate planting work by actively controlling the rice field so that it remains approximately constant regardless of the front and rear and left and right unevenness of the board. Moreover, the balance arm 19 is a cylinder 12 for lifting/lowering control.
In the embodiment, the lever arm 19 is pivoted on the side via a sliding piece 10, which ensures smooth horizontal swinging and back-and-forth movement, but the horizontal swinging of the balance arm 19 is similar to the conventional This is accomplished not by the cylinder provided between the balance arm and the cylinder rod, but by the operation of the horizontal control cylinder 12 supported by the guide bar 15 on the fuselage side via the slide holder 16. Become. Moreover, in the present invention, the distal end of the pivot arm 16b integrally extended from the slide holder 16 and the base end of the actuating arm 19b integrally extended from the balance arm 19 side are connected to the pivot arm 19 of the balance arm 19. The pin shaft 1 is swingable in a substantially coaxial position with the support shaft 10b.
9d, and by operating the horizontal control cylinder 17, the actuating arm 19b is supported by the pivot arm 16b, and by swinging the pin shaft 19d as a fulcrum, the horizontal swing of the balance arm 19 is achieved. It will be done. Therefore, the bending load generated when the balance arm 19 horizontally swings is applied to the lift control cylinder 12 as in the conventional case.
Rather than being received by the side, most of the damage is received by the guide bar 15 on the body side via the slide holder 16. As a result, the lift control cylinder 12 is
It is only necessary to mainly receive a linear load along the cylinder expansion/contraction direction in the front/back direction, which displaces the balance arm 19 together with the slide holder 16 in the front/rear direction, so that the expansion/contraction operation is reliable, and the lift control cylinder 12 itself There is no need to make it large to handle the bending load, and this can greatly contribute to reducing the size and weight.

[Operations and Effects] In summary, since the present invention is constructed as described above, the balance arm is pivotally supported on the rod side of the lift control cylinder to perform smooth horizontal control rocking and back-and-forth movement. Although it is possible to
The horizontal control device for swinging the balance arm is supported by a guide bar on the machine side through a slide holder so as to be movable back and forth, and the scale arm is a swing arm integrated with the slide holder supported on the machine body side. The slide holder side of the operating arm is pivoted at a position substantially concentric with the pivot axis of the balance arm, and is connected to the horizontal control device via the operating arm, so that the slide holder side of the operating arm as the horizontal control device operates. The horizontal swing of the balance arm is achieved by the swing supported by. Therefore, most of the bending load when horizontally swinging the balance arm is received by the guide bar on the body side that guides the slide holder, rather than on the lift control cylinder side as in the conventional case.As a result, the lift control cylinder It is only necessary to mainly receive the load that causes the balance arm to move back and forth, which does not allow for smooth and reliable operation, and there is no need to make it large enough to withstand bending loads. This will greatly contribute to the simplification of .

[Brief explanation of the drawing]

The drawings show an embodiment of the lifting control device for running wheels according to the present invention, in which Fig. 1 is an overall side view of a walking rice transplanter, and Fig. 2 is a partially cutaway side view of the lifting control unit. FIG. 3 is an enlarged side view, FIG. 3 is a plan view of the same as above, and FIG. 4 is a perspective view of essential parts of the elevation control section. In the figure, 1 is the main body of the aircraft, 12 is a lift control cylinder, 15 is a guide bar, 16 is a slide holder,
17 is a horizontal control cylinder, 19 is a balance arm, 23
is the running wheel.

Claims (1)

[Claims] 1. A balance arm, which is connected to the ends of left and right running wheels provided on the main body of the aircraft, is swingably pivoted to the end of a rod of an elevation control cylinder that is displaced in the longitudinal direction, and the running wheels are connected to the cylinder. In a paddy field work machine configured to perform simultaneous lifting and lowering by integral back and forth movement of the balance arm upon operation, and reverse lifting and lowering by swinging around the pivot axis of the balance arm, the main body of the rice paddy field is A slide holder equipped with a horizontal control device is supported slidably in the front and rear directions on a guide bar provided on the side, and an operating arm connected to the horizontal control device is integrally provided on the balance arm, and furthermore, a slide holder equipped with a horizontal control device is attached to the lever arm. Lifting and lowering of a traveling wheel in a paddy field working machine characterized in that an integrally extending pivot arm is swingably pivoted to the balance arm side at a position substantially concentric with the pivot shaft of the balance arm. Control device.