JPH0218972Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a wheel lifting device in a rice transplanter. As shown in FIGS. 6 and 7, a conventional wheel lifting device for a rice transplanter, for example, has a slider rod slidably supported on a pair of left and right guide rods A and A installed in the longitudinal direction of the machine's traveling direction. In the Sliderro, a balance arm is pivotally connected to the base end of a swing case with wheels pivoted at both ends via rods and bolts, so that it can swing horizontally. The wheels can be adjusted up and down by moving them back and forth.

However, with this configuration, as shown in the figure, the slider rod is elastically supported so as to be able to slide freely not only on the guide rods A and A, but also on the ram hole of the hydraulic cylinder housing via springs, so that the balance cannot be easily moved. The pin that connects the arm and the slider and serves as the swinging fulcrum of the balance arm can not be passed through the slider in the vertical direction, so we had no choice but to divide the pin into two parts, the upper and lower, and fasten them with bolts (see Figure 7). ) had no choice but to adopt. This not only makes assembly difficult, but also because the slider roller is guided by both the guide rods A, A and the ramho' as described above, the sliding movement of the slider roller tends to become unsmooth, and the machining accuracy of each part is affected. Extremely high assembly accuracy is required, which inevitably leads to high costs. In addition, even a slight assembly error will impair the up-and-down tracking of the wheels during planting work, significantly reducing the control of the machine's attitude in the field, and This had the disadvantage that the cushioning effect deteriorated, leading to damage to the aircraft when driving on the road.

The present invention was developed to eliminate the above-mentioned drawbacks, and its purpose is to reduce the cost by making assembly and processing easier. To maintain smooth operation at all times to improve the vertical tracking of the wheels, and to fully exert the buffering effect of the compression spring to reliably prevent damage to the aircraft body due to impact when driving on the road, etc. The purpose of the present invention is to provide a wheel lifting device for a rice transplanter that can perform the following tasks.

To explain the structure of the present invention with reference to one embodiment shown in the drawings, Fig. 1 is an overall side view of a rice transplanter;
A pair of left and right swing cases 2, 2, which are supported to be movable up and down with respect to a horizontal axis 1, have wheels 3, 3 pivotally supported at their pivoting tips, respectively. Levers 2', 2' integrally protruding from the base ends of the swing cases 2, 2 are connected to a balance arm 13, which will be described later, via rods 4, 4, respectively, and are used to extend and retract the hydraulic cylinder. By moving the balance arm back and forth, the height of the wheels 3, 3 can be freely adjusted, and these constitute a wheel lifting device A of the rice transplanter.

Figures 2 to 5 are wheel lifting device A according to the present invention.
This figure shows the structure of the aircraft, in which numerals 5 and 5 denote a pair of left and right guide rods installed horizontally in the longitudinal direction of the aircraft's traveling direction. Reference numeral 6 denotes a slider supported slidably on the guide rods 5, 5, and 7 is a hydraulic cylinder, with a movable spring seat 8 sliding in the axial direction of the ram on the tip side of the ram 7' of the hydraulic cylinder 7. A fixed spring seat 9, which is movably fitted and faces the movable spring seat 8, is integrally fixed to the ram 7, and compression springs 10, 10' are inserted between the two spring seats 8, 9. It is doubly interposed. Reference numeral 11 indicates a bolt for preventing removal.

By the way, the movable spring seat 8 is integrally formed by press working, and as shown in the figure, a part extends to the non-interfering side of the ram 7' located in front of the ram 7' in the direction of extension. A bearing portion 8a is provided at the portion, and one end edge of the bearing portion 8a supports the spring pressure receiving portion 8b from the rear. A pin insertion hole 12 is provided in the bearing portion 8a in a state perpendicular to the imaginary extension line of the ram 7'. The balance arm 13 is connected by a pin 14 passing through the
is designed to horizontally swing around the pin 14.

Further, the spring pressure receiving portion 8b of the movable spring receiving seat 8 is the second spring pressure receiving portion 8b.
As shown in the figure, since the movable spring seat 8 is brought into contact with the front surface of the slider 6, the movable spring seat 8 is reinforced by the slider 6.

Reference numeral 15 in the figure is a locking device for the balance arm 13, and by inserting a lock pin 15a into pin holes 13' and 6' provided in the balance arm 13 and the slider 6, respectively, the swinging of the balance arm 13 is prevented. The wheels 3, 3 are adapted to move up and down in a horizontal state.

In the configuration as described above, during the planting operation, the wheels 3, 3 follow the tiller and move up and down around the horizontal shaft 1, but at this time, the movable spring seat 8 is rotated through the pin 14. Since it is connected to the balance arm 13 and the slider 6, it slides on the ram 7' of the hydraulic cylinder 7 while being constantly pressed by the compression springs 10, 10', and the slider 6 is guided and held by the guide rods 5, 5. Movable spring catch 8 and balance arm 1
It is forced to move forward and backward in synchronization with 3.

However, the slider 6 in the present invention is not fitted to the ram 7' and is simply jointed via the movable spring seat 8 and the pin 14, so the slider 6 Since the slider 6 is not guided and held by the ram 7' which performs the telescoping action, and the sliding guidance action is performed only by the guide rods 5, 5 which are horizontally fixed to the body, the slider 6 slides extremely smoothly. Therefore, the ability to follow the vertical movement of the wheels 3, 3 due to changes in the unevenness of the tiller and the vertical responsiveness of the wheels 3, 3 due to the expansion and contraction operation of the hydraulic cylinder 7 are greatly improved, and the accuracy of the running posture control of the rice transplanter is improved. This makes it possible to improve the posture of planting seedlings.

In addition, in conjunction with the smooth sliding movement of the slider 6, the cushioning effect of the compression springs 10, 10' is fully exerted when driving on the road, etc., so that the impact, etc. applied to the wheels 3, 3 is absorbed by the compression springs 10, 10'. It is effectively absorbed by the aircraft, preventing damage and deformation of the aircraft.

On the other hand, as shown in the conventional examples shown in FIGS. 6 and 7,
With a structure in which the slider rod is guided and held by both the guide rods A, A and the ram ho', a high degree of precision of parts and assembly is required to ensure smooth sliding of the slider rod. Since the device is designed to be connected as described above, there is no need for high precision in assembly, and even if there is some assembly error, it will not interfere with the sliding movement of the slider 6. Further, since the ram 7' does not pass through the slider 6, a single pin 14 can be connected to the movable spring seat 8 by passing through the slider 6 and the balance arm 13, which is strong and easy to assemble and process. This can be done easily and can significantly reduce costs.

Note that since the pressure receiving portion 8b of the movable spring seat 8 is in contact with the front edge of the slider 6, the slider 6
The load transmitted from the wheels 3, 3 side to the movable spring receiver 8 is not transmitted by the pin 14, but by the pressing action of the front edge of the slider 6. Pin 14 on seat 8
Since no rotational force is applied to the compression springs 10, 10' and the ram 7', buckling and bending moments do not act on the ram 7' and the compression springs 10, 10. Defects that cause damage or deformation to ′ are reliably prevented.

As described above, in the present invention, a slider is slidably supported on a pair of left and right guide rods installed in the forward and backward direction of the aircraft's traveling direction, and the slider is attached to the base end of a swing case with wheels pivotally supported at both ends. A balance arm connected to each side via a rod is pivoted so as to be horizontally swingable, and the balance arm can be moved back and forth by the expansion and contraction operation of a hydraulic cylinder to vertically adjust the wheel. A compression spring is wound around the ram, and a spring seat with a portion extending to the non-interfering side of the ram is slidably attached to the tip of the ram, and the spring seat, slider, and balance arm are connected to each other. Since they are connected through one pin and the balance arm is configured to horizontally swing around the pin, assembly and processing can be easily performed without requiring high precision, reducing costs. However, the sliding motion of the slider can be maintained smoothly at all times, and the vertical tracking and responsiveness of the wheels can be further improved, improving the accuracy of the running posture control of the rice transplanter and Not only can a good planting posture be achieved, but the compression spring can sufficiently provide a buffering effect, and it is possible to reliably prevent damage or deformation of the machine body due to impact when driving on the road, etc. effective.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a rice transplanter equipped with the present invention, Fig. 2 is a plan view of the main parts, Fig. 3 is a rear view of the main parts, Fig. 4 is a side view of the main parts, and Fig. 5 is a side view of the main parts. An overall perspective view of the movable spring receiver, FIG. 6 is a cross-sectional plan view of the conventional example,
FIG. 7 is a partially cutaway vertical rear view of the conventional example. In the figure, 2 and 2 are swing cases, 3 and 3 are wheels, 4 and 4 are rods, 5 and 5 are guide rods, 6 is a slider, 7 is a hydraulic cylinder, 7' is a ram, 8 is a spring seat, and 10 , 10' is a compression spring, 13 is a balance arm, and 14 is a pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A swing case in which a slider is slidably supported on a pair of left and right guide rods installed in the longitudinal direction of the aircraft's traveling direction, and the slider has wheels pivotally supported at both ends thereof. A lever arm is connected to the base end side of the wheel via a rod so as to be horizontally swingable, and the wheel can be adjusted up and down by moving the lever arm back and forth by extending and contracting a hydraulic cylinder. A compression spring is wrapped around a ram of a hydraulic cylinder, and a spring seat with a portion extending to the non-interfering side of the ram is slidably attached to the tip of the ram, and the spring seat, slider, and A wheel lifting device for a rice transplanter, characterized in that a balance arm is connected through one pin, and the balance arm is configured to horizontally swing around the pin. (2) Utility model registration claim 1 characterized in that the spring seat is brought into contact with the front surface of the slider
The wheel lifting device for the rice transplanter described in Section 1.