JPS61265004A - Agricultural machine for rice field - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an agricultural machine for use in rice fields, which has a running vehicle body equipped with a working device such as a rice transplanting device.

(Prior art) A working device such as a rice transplanter is attached to a traveling vehicle body, and a detector detects the height of the tiller, and the working device is raised and lowered in accordance with the detection results of the detector, and is adjusted to the field situation. BACKGROUND ART Agricultural working machines for paddy fields are widely used and are equipped with a hydraulic device that always maintains the vertical position of the working device constant. Furthermore, some agricultural machines for paddy fields are equipped with an operating lever that has the functions of raising and lowering the working device and of intermittent transmission of power to the working device. In this type of agricultural machine, when the operating lever is pushed down to lower the working equipment, power is transmitted to the working equipment, and when the operating lever is pushed towards the raised side of the working equipment, power is transmitted. is now cut off.

By the way, with such agricultural machinery for paddy fields, it is dangerous for the working equipment in the raised position to be lowered by simply moving one operating lever. It is preferable to provide some kind of safety device that can prevent the working device from lowering simply by moving the operating lever.

Furthermore, in order to inspect the working device, etc., it is necessary to be able to operate the working device in a lifted state.

(Problem to be solved by the invention) However, in order to be able to operate the work machine in a raised position, or to prevent it from descending only by operating the control lever, it is necessary to There was a problem in that it required levers, valves, etc., and was uneconomical.

(Means for Solving the Problems) In order to solve the above problems, the present invention employs the following configuration.

That is, the agricultural machine for paddy fields according to the present invention is provided with an operating lever that raises and lowers the working device by switching the hydraulic system, and a sensitivity adjustment lever that adjusts the sensitivity of the detector, and the operating lever is provided with an operating lever that adjusts the sensitivity of the detector. When the clutch that cuts off the transmission of power to the equipment is connected, power is transmitted to the work equipment when the control lever is placed in the work equipment lowered position, and power transmission is interrupted when the work equipment is placed in the raised position. The sensitivity adjustment lever is provided with a fixing means that restricts the actual lowering of the working device even when the operating lever is placed in the lowered position.

(Function) When the operating lever is positioned on the upward side, the working device is held -1
- is raised, and the movement of the work equipment is stopped. Furthermore, when the operating lever is positioned on the lowering side, the working device is lowered to the working position and activated. On the other hand, if the fixing means of the sensitivity adjustment lever is activated while holding the working device in a slightly bent state, the working device will not descend even if the operating lever is moved to the lowering side, but its movement will start.

(Example) FIGS. 1 and 2 show an example of a rice field agricultural working machine according to the present invention, and show a rice transplanter 1 having a rice transplanting device as a working device mounted on a traveling vehicle body. This rice transplanter l is provided with an engine stand 3 at the front part of a transmission case 2 of a running vehicle body 1a, and on both left and right sides of the mission case 2.
The base of a rearwardly extending chain case 4.4 is attached. A rear wheel 5.5 is pivotally supported at the rear end of the chain case 4.4, and is rotationally driven by the power transmitted from the transmission device in the transmission case 2 by a chain stretched inside the chain cases 4, 4. It is supposed to be done. Front wheels 6, 6 are provided on both left and right sides of the engine stand 3 so as to be able to change direction.

The engine installed on the engine stand 3 is mounted on the bonnet 7
covered by.

A passenger seat 8 is provided on the upper part of a rear-view gate-shaped frame body 9 that connects the left and right chain cases 4, 4 in a circular manner. A protruding frame 14.14 is provided inside the gate-shaped frame 9,
A wooden upper link 16 is rotatably supported at the interval. Further, a pair of left and right lower links 17.17 are provided parallel to the upper link 16, and the front ends of the lower links 17.17 are connected to the projection frame 14.
．． It is rotatably attached to 14. Upper and lower links IEI, 17,1? The rear end portion of is attached to the connecting frame 20. These upper and lower links 16.1? , 17, the projecting frame 14, 14, and the connecting frame 20 as a whole constitute a parallel link device 21 that can be rotated up and down.

A piston rod of a hydraulic sill 24 for lifting and lowering the rice transplanting device, which is pivotally connected to the frame 9, is connected to the intermediate portion of the upper link 16. If this hydraulic cylinder 24 is extended, -F
Link 16 is swung upward.

The rice transplanting device 28, which is a working device, has a seedling tank 28 that is tilted above a transmission case 27 that also serves as a rice transplanter frame, with the front side facing upward, and a planting claw 29a at the tip. It is equipped with a planting rod 28 that moves up and down in an orbit to take out seedlings one by one from a seedbed placed on a seedling tank 28 and plant them in the field. On the lower side of the transmission case 27, there is one center float 30 and one left and right float.
The pair of side floats 31 and '31 are each pivotally connected to the transmission case 27 by a pin 32 at the rear, and are also connected to the transmission case 27 by an expansion link 33 at the front, allowing the front parts to rotate up and down. It is set up so that it is.

Next, the operating lever 40 provided near the operator's feet as operating devices for the rice transplanting device 26, the sensitivity adjustment lever 8-41 provided on the side of the seat 8, and their mechanisms will be described.

The operating lever 40 is provided so as to be rotatable around the fixed shaft 43 and slidable in the axial direction around the fixed shaft 43 installed horizontally below the floor surface.

Then, operate the arm 4 to the cylindrical base 40a of 8-40.
4 is integrally provided in a direction perpendicular to the operating lever 40. This arm 44 has two wires 4 that are slidably supported on a support plate 45. , 48 are attached at each end. One wire 47 is connected to a planting clutch provided inside the transmission case 27 of the rice transplanting device. The other wire 48 is connected to a hydraulic system described later.

Further, the operating lever 40 is a shifter I as shown in FIG.
- Fits into the shift groove 51 provided on the guide plate 50. The shift groove 51 is formed along the rotating direction of the operating lever 40, and its front end 51a is at the "down" shift position, and the rear end 51b is at the "up" shift position. Furthermore, the end 51c of the branch groove provided in the middle of the groove is in the "neutral" position.

The sensitivity adjustment lever 41 is rotatably attached to the side surface of a hydraulic device 53 provided below the seat 8 via a shaft 54 . Further, the shaft 5 is provided on the side surface of the hydraulic device 53.
4, a valve shaft 55 for switching the valves of the hydraulic system is provided, and a valve arm 57 having a bent portion 57a at its upper portion is integrally attached to this valve shaft 55. The other end of the wire 48 is connected to the upper part of the valve arm 57, and a vertical motion detector 58 provided at the front end of the center float 30 is connected to the lower part on the opposite side of the valve shaft 55. Attached is the end of a wire 58 that connects to. These wires 48, 59 are attached to the valve arm 57 in opposite directions.

Furthermore, the −L portion of the valve arm 57 and the sensitivity adjustment lever 4
1, a sensitivity adjustment spring 60 is stretched between the two. The spring 60 is biased to rotate the upper portion of the valve arm 57 in the opposite direction to the wire 48 . In this embodiment, the detector 58 includes a lever 62 whose intermediate portion is pivotally supported by the transmission case 27, and a rod 63 that connects one end of the lever 62 and the front end of the center float 3o. A wire 58 is connected to the other end of the lever 62, and the wire 58 is pulled when the center float 30 moves upward. The detector 58 may have a configuration other than the wooden one as long as it can rotate the valve arm in a predetermined direction in response to the vertical movement of the center float.

Further, the shift guide plate 65 of the sensitivity adjustment lever 41 is
A shift groove 66 as shown in the figure is provided. A plurality of engaging portions 86a are provided in the center of the groove.

66b, . . . are the "work" shift positions, and the more the lever 41 is engaged with the engagement portion closer to the rear (lower side in FIG. 5), the greater the tension of the spring 60 becomes. Further, the engaging portion E18e provided at the rear end of the groove is in the “lock” position, and when the lever 41 is engaged with the engaging portion 8Ele, the tension of the spring 80 is due to the buoyant force of the center float 30. It is thicker than the tension of the wire 59. Further, the engaging portion 88f provided at the front end of the groove is in the “fixed” position, and when the lever 41 is engaged with the engaging portion 88f, the sixth
As shown in the figure, the middle part of the lever 41 is connected to the valve arm 5.
Bend part 5 of 7? It comes into contact with a.

When using this rice transplanter 1, operate the 8-40 and shift it to the lower position 51a. wire 4 attached to
8 moves and the valve arm 57 rotates in the X direction. As a result, the hydraulic valve of the hydraulic device 53 is connected to the hydraulic cylinder 2.
4 is switched to the direction of contraction, and the rice transplanting device 26 is lowered to the surface of the topsoil. Further, when the operating lever 40 is tilted forward, the planting clutch to which the wire 47 is connected is engaged, and power transmission to the rice transplanting device 12B is started. The switching position between "on" and "off" of power transmission to the rice transplanting device is indicated by point A in FIG. On the "downward" side of point A, power is transmitted to the rice transplanting device 26.

Next, the sensitivity is adjusted, the 8-41 is shifted to an arbitrary working position in the shift groove 68, and the work is started. When the tiller in the field has a height, the expansion/contraction link 33 bends and stretches, and the front part of the float moves up and down according to the height.

This vertical movement is transmitted from the detector 58 to the valve arm 57 via the wire 59. When the center flow) 30 moves upward, the valve arm 57 is rotated in the anti-X direction by the wire 58, and the rice transplanting device 2B is lifted.

Further, when the center flow h30 moves downward, the valve arm 57 rotates in the X direction, and the rice transplanting device 26 is lowered. By the way, if you change the shift position of the sensitivity adjustment lever 41,
Since the tension of the spring 6o changes, the sensitivity of the reaction of the valve arm 57 to the vertical movement of the center float changes. When working in a field with soft soil, it is desirable to shift the sensitivity adjustment lever 41 to a working position closer to the front, and when working in a field with hard soil, it is desirable to shift it to a working position closer to the rear. Furthermore, the topsoil surface is extremely uneven in areas such as ridges where traces of wheels remain, but when leveling such areas, shift the sensitivity adjustment lever 41 to the lock position. put. In this state, the upward movement of the center float is restricted and the height of the rice transplanting device 26 can be kept constant.

When the work is completed, pull the control lever 4o backwards and
Shift to the "Up" position. Then, the wire 48 is pulled and the valve arm 57 is rotated in the anti-X direction, and the rice transplanting device 26 is raised to the supporting height during traveling. At the same time, the planting clutch is disengaged and power transmission to the rice transplanting device 28 is stopped.

In this way, in this rice transplanter 1, lifting and lowering of the rice transplanting device and intermittent transmission to the rice transplanting device are performed simultaneously in one operation, and normally when the rice transplanting device is in the raised state, the power transmission to the rice transplanting device is stopped. However, it is further possible to operate the rice transplanting device even in the elevated state. That is, when the sensitivity adjustment lever 41 is shifted to the "fixed" position,
As shown in FIG. 6, the intermediate portion of the sensitivity adjustment lever 41 engages with the bent portion 57a of the valve arm 57. As shown in FIG. In this state, even if the operating lever 40 is pulled to the "down" side ("in" side) to start power transmission to the rice transplanting device, the valve arm 57 will not rotate in the X direction due to the above-mentioned engagement relationship, and the hydraulic The valve of device 53 does not switch to the "down" side. Therefore, it is possible to move the rice transplanting device without lowering it.

(Effects of the Invention) As is clear from the above explanation, the rice field agricultural machine according to the present invention has one lever for lifting and lowering the working device and one clutch lever for turning on/off the transmission of power to one working device. The operating lever is also configured to engage the transmission clutch in the "lower" position, and the operating lever is set to the "lower" position as a sensitivity adjustment lever that adjusts the sensitivity of the detector that controls the lifting and lowering of the work equipment. Since we have added a fixing means to restrict the lowering of the work equipment even if the machine is shifted to the lower position, it is possible to prevent the work equipment from dropping unexpectedly due to carelessness, etc., without the need for other safety devices such as locking levers or valves. This also makes it possible to operate the work equipment in the raised position if necessary.

[Brief explanation of drawings]

Fig. 1 is a side view of a rice transplanter which is an example of a riding agricultural machine according to the present invention, Fig. 2 is a plan view of the rice transplanter, Fig. 3 is an explanatory diagram of the main parts, and Figs. 4 and 5. 6 is an explanatory diagram of the shift guide plate, and FIG. 6 is an explanatory diagram of its functions.

Claims (1)

[Claims] (1) A working device such as a rice transplanting device is attached to the traveling vehicle body, and a detector detects the height of the tiller, and the working device is moved up and down in response to the detection results of the detector, and the working device is adjusted to the field. An agricultural machine for paddy fields is equipped with a hydraulic device that always keeps the vertical position of the detector constant, an operating lever that raises and lowers the working device by switching the hydraulic device, and a sensitivity adjustment lever that adjusts the sensitivity of the detector. A clutch is connected to the operating lever for intermittent transmission of power to the working device, so that when the operating lever is positioned at the working device lowering position, the power is transmitted to the working device and the working device is at the lifting position. The sensitivity adjustment lever is configured such that power transmission is cut off when the operating lever is in the lowered position, and the sensitivity adjustment lever is provided with a fixing means that restricts the actual lowering of the working device even when the operating lever is positioned in the lowered position. This agricultural machine for paddy fields is characterized by: