JPH0138443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, a rice transplanter is already known in which the left and right wheels are raised and lowered by a hydraulic device and the left and right wheels are caused to see-saw by a seesaw mechanism.

However, in the known seesaw mechanism, the seesaw arm was directly pivotally connected to the piston rod of the hydraulic cylinder as shown in FIGS. Increasing the strength of the piston rod in response to this increases the piston rod's diameter, increasing weight and cost.

In addition, a seesaw-type swinging arm that becomes a balance arm is superimposed on the top surface of the frame member on the machine side, and a fulcrum means is inserted from above to enable rotation of the seesaw-type swinging arm and the upper part of the frame member. Although this method is already known, when the frame member is pushed or pulled by a hydraulic cylinder, it applies a bending force in the front and rear direction to the fulcrum means and the seesaw-type swinging arm, causing misalignment and causing the frame member to become misaligned. Twisting occurs between the members that guide both ends of the swing transmission case and the connection between the rod that connects to the swing transmission case and the end of the seesaw-type swinging arm, which may cause the seesaw-type swinging arm to malfunction and become smooth. It is difficult to raise and lower the wheels, and there are other problems such as early wear of the fulcrum means and the hole in the seesaw-type swinging arm into which it fits.

The present invention connects both ends of a balance arm that rotates around the middle part to a chain case that transmits power to the left and right wheels, causes the left and right wheels to see-saw, and moves the balance arm back and forth using a hydraulic cylinder. In a rice transplanter that raises and lowers wheels, guide rods parallel to both sides of the hydraulic cylinder are supported by a machine frame or a member integral with the machine frame, and a slider is slidably installed between the guide rods, A pair of upper and lower connectors into which the slider fits is attached to the tip of a hydraulic cylinder that moves the slider back and forth, and the connectors and
The aforementioned problems were solved by vertically overlapping the slider and the intermediate portion of the balance arm and connecting them rotatably through one connecting pin.

The embodiment shown in the drawings will be explained below.1
The engine and transmission case 2 are attached to the front, a pair of wheels are supported by swing chain cases 3 and 3 on both sides of the middle part, and a control unit consisting of a planting part and various operating levers and handles is attached to the rear. It is a rectangular cylindrical machine frame, and a chain that transmits power from the mission case 2 to the transmission device of the planting section is stretched inside, and is integrally installed upright on the swing chain cases 3, 3. The upper ends of the arms 4, 4 are rotatably connected to both ends of a horizontal balance arm 5 by connecting rods 6, 6.

Reference numeral 7 denotes a hydraulic cylinder fixed on the transmission case 2, and its piston rod 8 protrudes rearward.

Reference numerals 9 and 9 denote a pair of guide rods arranged in parallel at equal intervals on both left and right sides in a horizontal plane containing the piston rod 8, and the rear portions of these rods are connected to a stay erected on the machine frame 1. 10, and its front end is loosely fitted into holes 11a, 11a of a receiving plate 11 fixed to the rear of the hydraulic cylinder 7.

Reference numeral 12 denotes a slider whose both ends are slidably fitted into the guide rods 9, 9, and the intermediate portion of the balance arm 5 is rotatably connected to the intermediate portion of the slider by a pin 13. A buffer body 14 interposed between the slider 12 and the piston rod 8
consists of a prismatic cushioning material 16, bowl-shaped plates 15a, 15b fitted to the front and rear surfaces of the cushioning material 16, and a connecting metal 17 that connects the front and rear plates 15a, 15b. to the rear end surface of the piston rod 8, and
A pair of projecting pieces 17' projecting rearward from 7;
17' is rotatably fitted to the pin 13, overlapping the upper and lower surfaces of the balance arm 5.

The buffer material 16 may be a spring, and the coupling metal 17 may be a plurality of bolts.

Furthermore, the coupling metal 17 was provided because the rice transplanter in this example is relatively large and the hydraulic cylinder 17 is a double-acting type, and the weight of the machine body is always loaded onto the buffer material 16 in the compression direction. This is not essential, and if this is omitted, the projecting pieces 17', 17' are attached to the rear plate 15b.

19 is a holder 20 near one end of the balance arm 5
The lock pin is inserted into the slider 1 so as to be movable up and down, and is biased upward by a spring 21.
The wire 22 is engaged and disengaged by operating the wire 22 into a hole 12a' of a plate portion 12a protruding from one end of the wire 22.

In the above-mentioned device, if the tiller is tilted in the left-right direction during the planting operation, the left and right wheels move up and down in opposite directions, and the balance arm 5 swings back and forth around the pin 13.

Furthermore, if the tiller is tilted in the front-rear direction, the float and sensing mechanism sense this and the valve of the hydraulic system is activated, which activates the hydraulic cylinder 7, so that the piston rod 8 is moved through the buffer 14. The balance arm 5 and slider 12 are moved back and forth, and the left and right wheels are moved up and down.

When the wheel seesaws or moves up and down, uneven lateral loads are applied to both ends of the balance arm 5, but the slider 12 connected to it by a pin 13 is attached to the left and right guide rods. Since the piston rod 8 moves back and forth while being firmly held at 9, 9, no bending load is applied to the piston rod 8. Furthermore, since the piston rod 8 is connected to the slider 12 and the balance arm 5 via the buffer 14, loads in different directions are not transmitted to the piston rod 8.

Note that the rear surface of the coupling metal 17 (or plate 15b)
Since there is a gap a between the slider 12 and the slider 12, the buffer 14 also rotates relative to the slider 12.

As described above, the present invention connects both ends of the balance arm that rotates around the middle part to a chain case that transmits power to the left and right wheels, causing the left and right wheels to see-saw, and using a hydraulic cylinder to move the balance arm back and forth. In a rice transplanter whose wheels are raised and lowered by moving the wheels, guide rods parallel to both sides of the hydraulic cylinder are supported by a machine frame or a member integrally with the machine frame, and a slider can freely slide between the guide rods. A pair of upper and lower connectors into which the slider fits is attached to the tip of a hydraulic cylinder that moves the slider back and forth, and the connectors, the slider, and the intermediate portion of the balance arm are vertically overlapped. At the same time, since they are connected rotatably through one connecting pin, the slider, the piston rod of the hydraulic cylinder, and the balance arm can be easily connected and assembled by inserting one connecting pin. Can be done.

In addition, the connecting pin is supported at its upper and lower ends by a pair of upper and lower connecting devices, and does not tilt back and forth.Therefore, the slider slides smoothly against the guide rod, and the balance arm moves back and forth. There is no tilting, and as a result, the left and right wheels can be smoothly raised and lowered in the same direction by the hydraulic cylinder, and the left and right wheels can be raised and lowered in the opposite direction by the swinging of the balance arm.

Furthermore, it is possible to prevent twisting in each connecting portion and sliding portion, and to suppress wear of each of these portions.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
Figure 1 is a plan view of the main parts, Figure 2 is a side view of the same, Figure 3 a is a sectional view of the buffer, and b is a perspective view of the coupling metal.
Fig. 4 is a rear view of the main part, Fig. 5 is an enlarged plan view of the same partially cut away, Fig. 6 is a plan view of the conventional example, and Fig. 7 is a plan view of the conventional example.
The figure is a side view of the same as above. 5... Balance arm, 6... Link rod, 7... Hydraulic cylinder, 8... Piston rod, 9... Guide rod, 12... Slider, 14... Buffer body.

Claims (1)

[Claims] 1 Both ends of the balance arm that rotates around the middle part are connected to a chain case that transmits power to the left and right wheels, and the left and right wheels are caused to see-saw, and the wheels are moved by moving the balance arm back and forth using a hydraulic cylinder. In a rice transplanter that is designed to be raised and lowered, guide rods parallel to both sides of the hydraulic cylinder are supported by a machine frame or a member integral with the machine frame, and a slider is slidably installed between the guide rods, and the slider A pair of upper and lower connectors into which the slider fits is attached to the tip of a hydraulic cylinder that moves the balance arm back and forth, and this connector, the slider, and the middle part of the balance arm are vertically overlapped and form a single connector. A wheel lifting device for a rice transplanter, characterized in that the wheel is rotatably connected through a pin.