JPS6314583Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a wheel vertical motion limiting device for a walk-behind rice transplanter, and more specifically to a wheel vertical motion limiting device convenient for rice planting work along the ridge.

[Conventional technology]

A walk-behind rice transplanter has wheels on the left and right sides, and a float is attached to the rice transplanter body so that it receives buoyancy from the rice field and bears part of the weight of the rice transplanter body as it moves around the field. The planting machine placed at the bottom end of the stand is always kept at a constant height relative to the rice field surface during work, and even if the wheels of the rice transplanter move up and down due to the unevenness of the tiller, the planting depth of the seedlings remains constant. It has been devised as follows. For this purpose, it is necessary that the left and right wheels of the walk-behind rice transplanter move up and down with respect to the rice transplanter body, and that the left and right wheels move up and down independently.
Therefore, walk-behind rice transplanters are equipped with a device that allows the left and right wheels to partially conform to the unevenness of the tiller, but this device usually consists of a single hydraulic cylinder. Therefore, even when the left and right wheels are placed on plowing platforms of different shapes (heights), a swing device is provided to ensure that both wheels are firmly in contact with the ground. This swing device is designed to ensure that the left and right wheels of the rice transplanter are firmly in contact with the tiller by the expansion and contraction of a single cylinder unit, thereby preventing loss of driving force. Its structure is such that a hydraulic cylinder unit is arranged in the length direction of the rice transplanter, and the tip of the piston rod is pivotally supported in the center of a swing arm arranged in the width direction of the rice transplanter, and is connected to both ends of this swing arm. The ends of the rod are connected, and the other end is connected to a transmission case such as a chain that also serves as an arm to move the wheels up and down, so that the left and right wheels have different heights (depths).
Even when the tiller is on different tillers, the swing arm can rotate left and right within an appropriate range around the pivot point at the tip of the piston rod, allowing the left and right wheels to touch the ground.

[Problem that the invention attempts to solve]

However, at the edge of the ridge, there is a considerable difference in level between the deep and shallow parts of the tiller, so when the left and right wheels adjust to the unevenness of the tiller, the transmission case that supports the wheels becomes nearly upright, and the rice transplanter Although it is necessary for both the left and right wheels to adjust to the unevenness of the tiller, this is only within a certain range.

[Means to solve the problem]

Therefore, this invention was developed for a walk-behind rice transplanter equipped with a swing device that has a single cylinder unit that expands and contracts according to the unevenness of the tiller, and that moves the left and right wheels up and down independently by the expansion and contraction of this cylinder unit. , a movable boss is fitted and inserted into the tip of the piston rod forming the cylinder unit, a left and right center portion of the swing arm is pivotally attached to the movable boss so as to be swingable left and right, and integrally with the movable boss, A swing stopper that restricts the left and right ends of the swing arm from swinging beyond a certain range beyond the pivot point, and a connecting member that connects the swing arm with a pin to prevent the swing arm from swinging. It is characterized by the fact that it is provided.

【Example】

The details of this invention will be explained below with reference to the attached drawings. In Fig. 1, reference numeral 1 indicates the main body of the walking-type rice transplanter, and a transmission shaft 3 to which the output of the engine 2 is transmitted.
Wheels 5 are attached via a drive shaft 6 to the free end of a transmission case 4 containing a chain and the like, and are arranged symmetrically on both left and right sides. Therefore, for example, the wheels 5 are configured to move up and down due to the circular movement of the transmission case 4 about the transmission shaft 3 in response to unevenness of the tiller. Furthermore, a float 7 is provided at the lower part of the rice transplanter main body 1.
is attached by a movable member such as a link, so that part of the weight of the rice transplanter body 1 can be borne by the buoyancy exerted by the float 7 within the rice field surface. One end of a plowing depth sensor rod 8 is attached to detect the depth and operate a hydraulic system switching valve of a swing device to be described later. A seedling mounting stand 9 is attached to the rear end of the rice transplanter main body 1, so that pine seedlings m can be planted while being cut out by a planting machine placed at the lower end thereof. A swing device 10 is constructed at the center position in the width direction of the rice transplanter main body 1, and a single hydraulic cylinder unit 11 serving as a drive source for the swing is arranged. Pressure oil can be supplied to the cylinder unit 11 via the oil passage switching valve 12. The upper end of the sensor rod 8 is connected to this oil passage switching valve 12 via a connecting rod 12a, and the float 7 moves up and down (more precisely,
Since the float is floating on the field surface, the wheels move up and down, and when the wheel 5 goes down, the float 7 becomes relatively floating.) This changes the oil path.
When the tiller is deep, the hydraulic cylinder unit 11
Extend the piston rod 11a according to the depth,
The wheels 5 are lowered. A swing stopper 13 is attached to the tip of the piston rod 11a, and the swing stopper 13 is attached to a movable boss portion 13a that is inserted into the piston rod 11a, and the swing stopper 13 is attached to a movable boss portion 13a that is inserted into the piston rod 11a. An arm 13b as a fixing part extends out, has a pin hole 13c at the tip of the arm, and has mountain-shaped inclined surfaces 13d and 13e at the cylinder side end of the boss part 13a with the outer end closer to the cylinder. Motsu stopper part 13
It is composed of f. A central portion of a swing arm 14 is pivotally supported by a boss portion 13a of this swing stopper 13, and both ends of this swing arm 14 have a connection that forcibly rotates the transmission case 4 around the transmission shaft 3. One end of the rod 15 is connected by a connecting pin 15a, and the other end of the connecting rod 15 is connected to a drive arm 16 protruding from the transmission case 4 by a connecting pin 15b. The swing arm 14 has a locking pin 14a that always projects at a position overlapping the pin hole 13c of the arm 13b, and when the locking pin 14a is pulled up against the spring 14b, the swing arm 1
4 and the arm 13b can be released from the locked state. Next, the operation of the wheel vertical movement limiting device of the walking rice transplanter according to this invention will be explained. For example, when planting rice near the furrow K shown in an exaggerated manner in FIG.
are located on the deep plowing platform, so the left wheel 5
Unless L is in the upper position and the right wheel 5R is not in the lower position, the entire rice transplanter cannot be kept horizontal. Therefore,
The piston rod 11a of the cylinder unit 11 extends, but since the left wheel 5L is in contact with the tiller KB, the swing arm 14 can swing until it hits the slope 13d of the stopper part 13, and within that range, the swing arm 5L is in contact with the tiller KB. 14 swings. In other words, when the swing arm 14 hits the slope of the stopper part 13, the left wheel 5L does not move upward even if the tiller KB becomes shallow, and the right wheel 5R does not move down unless the piston rod 11a extends. . Therefore, the transmission case 4 never stands upright. Conversely, if the right wheel 5R is on the shallow plowing platform KB,
When the left wheel 5L is on the deep plowing platform KB, the swing arm 14 is allowed to swing until it hits the slope 13e of the stopper part 13. While the swing arm is in contact with the slope, the vertical movement of the left and right wheels is locked, as long as the topography of the tiller is the same. Furthermore, when driving on the road, the left and right wheels 5
There is no need for the swing arm 14 to move up and down independently, and moving up and down separately on the left and right would generate vibrations, so the swing arm 14 is engaged with the arm 13b by the engagement pin 14a. Unify.

[Effect of the idea]

As is clear from the above explanation, according to the wheel vertical movement limiting device of the walking rice transplanter of this invention, when the height difference between the left and right wheels exceeds a certain level, the swing movement of the swing arm is controlled by the swing stopper. By restricting the height difference between the wheels and allowing the boss to move forward and backward in this state,
Even in areas where there is a difference in the plowing platform, such as at the edge of a ridge, the wheels can be raised and lowered while the left and right sides remain level, providing stable propulsion and allowing rice planting work to be carried out in a stable manner. Furthermore, although the configuration is simple, reliable operation can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view of a walk-behind rice transplanter equipped with the vertical motion restriction device of this invention, Fig. 2 is a plan view of the device,
FIG. 3 is a side view taken along the line of FIG. 2, and FIG. 4 is a front view of the rice planted at the edge of a ridge. 10... Swing device, 11... Hydraulic cylinder unit, 11a... Piston rod, 13...
Swing stopper, 13a...Boss part, 13b...
...Arm, 13c...Pin hole, 13d, 13e...
... Sloped surface, 13f... Stopper portion, 14... Swing arm, 15... Connection rod.

Claims (1)

[Scope of Claim for Utility Model Registration] A walk-behind rice transplanter equipped with a swing device that has a single cylinder unit that expands and contracts according to the unevenness of the tiller, and that moves the left and right wheels up and down independently by the expansion and contraction of this cylinder unit. In the machine, a movable boss is fitted and inserted into the tip of the piston rod forming the cylinder unit, and a left and right center portion of the swing arm is pivotally attached to the movable boss so as to be able to swing left and right, and is integrated with the movable boss. a swing stopper that restricts the left and right ends of the swing arm from swinging back and forth beyond a certain range beyond the pivot point;
A wheel vertical movement limiting device for a walk-behind rice transplanter, comprising a connecting member that connects the swing arm with a pin so that the swing arm does not swing.