JPH06169611A - Rolling support structure of working apparatus - Google Patents

Abstract

PURPOSE:To simplify a rolling support structure by using a mechanism for forcing rolling operation to neutral posture in an operation apparatus coupled to a machine body so as to be able to freely elevate and also so as to be a rolling locking mechanism at upper limit position. CONSTITUTION:In a rolling support structure, operation apparatus 2 is connected to a travelling machine so as to be able to freely elevate and freely laterally carry out rolling, and rods 20 and 20 are pivotally connected on the outer side than pivoting position on the operation apparatus side of elevation links 1a and 1a and each rod 20 is arranged along upper and lower directions in a state inserting bracket 21 on the operation apparatus side, and springs 22 and 23 are each externally installed on both upper and lower sides of the bracket 21 and a slip stopping support part 25 is provided in the lower end part of the rods 20 and 20, and a mechanism T for returing and keeping rolling operation to neutral posture is constituted by the spring 22 and 23 and pitch of the spring 23 is set so as to become tightly pressed state when the operation apparatus 2 is raised to nearly upper limit position to carry out lock of rolling by this spring 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a working device, such as a seedling planting device, to a traveling machine body through a pair of left and right lifting links so that the working device can be raised and lowered and left and right can be freely rolled. The present invention relates to a rolling support structure for a working device, which is configured to urge the mechanism to return to a rolling neutral posture and to roll lock the working device at an upper limit position.

[0002]

2. Description of the Related Art In the rolling support structure of the above working apparatus, conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 1-269413, a vertical link pivotally connected to the rear portion of the elevating link and the rear surface of the seedling stand. A pair of left and right coil springs are stretched across the left and right side support parts to urge them to return to the rolling neutral posture, and although not shown in detail, the seedling planting device has a maximum raised position. When it is moved up to, the contact control device provided on the seedling planting device side is configured to contact the lower surface side of the left and right lifting links to restrict the rolling operation.

[0003]

In the conventional structure described above, the mechanism for urging the rolling operation of the working device to return to the neutral position and the rolling lock mechanism at the maximum raised position are separately provided. Since the mechanism has a structure in which rolling lock is forcibly performed on the lower side of the left and right lifting links by abutting action, a large strength is required, and the structure is complicated. Further, since the neutral return spring has a structure that exerts a neutral restoring force by a pulling force and has a long expansion and contraction stroke, there is a possibility that the work device swings back largely and excessive rolling vibration occurs, and there is room for improvement. The present invention aims to eliminate the above-mentioned problems.

[0004]

The first aspect of the present invention is characterized in that, in the rolling support structure of a working device described at the beginning, a rod is provided at a position on an outer side of a pivotal fulcrum of each lifting link on the working device side. Pivotally connect each rod, and deploy each rod along the vertical direction with the bracket on the ground working device side inserted, and attach springs to the rods on the upper and lower sides of the bracket, respectively, and attach the lower ends of the rods. In addition to providing a retaining support for the springs, the springs constitute the neutral biasing mechanism, and when one of the springs is brought into close contact with the work device when the working device is raised to the upper limit position, the spring pitch is set. Then, the rolling lock is made by this spring. The characteristic configuration of the second aspect of the present invention is configured such that when the working device is lowered to a substantially lower limit position, the pitch of the springs is set so that the other of the springs is in a close contact state, and the rolling lock is performed by the springs. There is a point.

[0005]

[Action]

[Operation of the First Invention] When the working device rolls from the neutral position to the left or right at the predetermined lifting position, the relative height of the bracket on the working device side with respect to the left and right lifting links changes, and the bracket is interposed therebetween. The spring is compressed, and the working force is returned to the neutral position and biased by the compression biasing force. Then, when the working device rises to near the upper limit position,
Based on the change in the relative angle between the lifting link and the working device, the distance between the rod pivot point of the lifting link and the bracket becomes long, and for example, a spring interposed between the bracket and the retaining support at the lower end of the rod is It degenerates into a close contact state and acts like a rigid body. As a result, the working device is set in the rolling lock state. [Operation of the Second Invention] In addition to the operation of the first invention, when the working device is lowered to the lower limit position, the rod pivot point of the lifting link and the bracket are based on the relative angle change between the link and the working device. The distance is shortened, and for example, the spring interposed between the rod pivot point and the bracket is contracted and brought into a close contact state, acting like a rigid body, and the working device is set to the rolling lock state.

[0006]

【The invention's effect】

[Effect of the first invention] By rationally disposing the spring for returning the working device to the rolling neutral position, the neutral urging mechanism can be used also as the rolling lock mechanism at the upper limit position of the working device. This is possible and the structure has been simplified. Moreover, since the biasing force for returning to the rolling neutral position is made by the compression force of the spring, there is an effect that the swinging back is less and vibration due to the excessive rolling operation is suppressed as compared with the pulling back force by the tension spring. [Effect of the second invention] In addition to the effect of the first invention, the neutral urging mechanism for the rolling operation is used not only for the rolling lock mechanism at the upper limit position but also for the rolling lock mechanism at the lower limit position of the working device. In addition, the structure can be simplified.

[0007]

Embodiments will be described below with reference to the drawings. Figure 1
Shows the rear part of the riding type rice transplanter. In this rice transplanter, a seedling planting device 2 (an example of a working device) is connected to a rear portion of a riding type traveling machine body (not shown) via a link mechanism 1 so as to be able to move up and down and to freely roll left and right around a longitudinal axis. The seedling planting device 2 has a feed case 4 and a plurality of planting cases 5 mounted and fixed to a square pipe-shaped main frame 3, and a seedling stand 6 that reciprocally moves laterally with a constant stroke, a lower end of the seedling stand 6 The planting mechanism 7 for taking out planted seedlings from the section and planting them in the field, the leveling float 8, and the like are configured. The link mechanism 1 is provided in a parallel four-link form,
The seedling planting device 2 is configured to be driven up and down by a hydraulic cylinder 9 while maintaining a substantially parallel posture, and the seedling planting device 2 is configured to freely roll around the longitudinal axis Y with respect to the link mechanism 1. There is. That is, the link mechanism 1 includes a pair of left and right lower links 1a, 1a [an example of a lifting link] and a pair of left and right upper links 1b, 1b.
The front side of each machine body is pivotally connected to the machine body frame 10, and vertical links 1c are formed on the rear side in the form of parallel four links.
Are pivotally connected. At the lower part of the vertical link 1c, a rolling support shaft 1 projecting from the feed case 4 in a cantilever manner.
A pivotal boss portion 12 is integrally formed with which the inner portion 1 is fitted so as to be relatively rotatable. The seedling planting device 2 has an axis Y of the pivot boss portion 12.
The transmission shaft 13, which is pivotally connected so as to perform a rolling operation around it and to which power is supplied from the traveling body side, is arranged so as to pass through the pivotal boss portion 12.

In the lifting / lowering hydraulic cylinder 9, a cylinder body 9a is pivotally connected to the body frame 10 side so as to be rotatable about a horizontal axis, and a suspension spring 14 is externally fitted and attached to the tip end of a cylinder rod 9b. Upper link 1b, 1
The seedling planting device 2 is configured to be driven up and down while being elastically supported by a spring holder 15 which is pivotally connected to a middle portion of b. A resin bush 17 is interposed between the support boss 16 on the tip end side of the spring holder 15 and the cylinder rod 9b to prevent generation of sliding contact noise between metals. This bush 17 is, as shown in FIG.
A part is cut away to improve the passage of grease so that smooth operation can be maintained, and retaining projections 18 for preventing slippage are formed on the outer peripheral surfaces of both ends.

The seedling planting device 2 is constructed so that the neutral urging mechanism T urges it back to the rolling neutral position, and during work traveling in the field, the leveling float 8 follows the ground to follow the neutral urging force. It is configured so that the planting work can be performed in a posture that substantially rolls against the mud surface and that the seedling planting device 2 is levitated to the ground so that the neutral urging mechanism T brings the plant into a substantially parallel posture. There is. In detail,
As shown in FIGS. 2 and 3, the left and right lower links 1a, 1
a extends slightly rearward of the pivotal connection point P with the vertical link 1c, and one end of the rod 20 is pivotally connected to the extension 19 so as to be relatively rotatable about the horizontal axis, and the left and right rods 20, 2
The reference numeral 0 indicates a state in which the bracket 21 fixed to the main frame 3 is inserted and is arranged along the vertical direction. Each rod 2
Coil springs 22 and 23 are externally fitted to and mounted on the upper and lower sides of the bracket 21, and the upper and lower ends are received and supported by washers 24 and 25, respectively, so that the compression biasing forces of the upper and lower springs 22 and 23 are predetermined. It is configured to have a desired pressure for balancing, and the spring biasing forces on the left and right rods 20, 20 are balanced while the seedling planting device 2 is in a predetermined neutral posture. The biasing force is adjusted by changing the position of the lock nut 26 for positioning the lower washer 25 (an example of the retaining support portion). Thus, in the free state, the seedling planting device 2 is always in a state of being balanced by the urging force of the springs 22 and 23, that is, the neutral urging mechanism T for urging the neutral return so as to be in the posture parallel to the body. There is. At this time, when the seedling planting device 2 rolls from the neutral position to either the right or left, either the upper or lower spring is compressed, and the compression urging force urges it back to the neutral position. Then, when the seedling planting device 2 is raised to the maximum raised position by driving the hydraulic cylinder 9, the rearward extending portions 19, 19 of the lower links 1a, 1a rise relatively to the seedling planting device 2, The pivot point of the rods 20, 20 and the bracket 21
The pitch of the lower spring 23 is set so that the lower spring 23 is compressed between the bracket 21 and the lower washer 25 to be in a close contact state. As a result, when the seedling planting device 2 is raised to the maximum raised position, the left and right lower springs 23, 23 act like rigid bodies to lock the rolling operation (see FIG. 2). At this time,
By setting the lengths of the left and right lower springs 23, 23 to be substantially the same, the seedling planting device 2 is rolling-locked in a posture parallel to the body. Further, when the seedling planting device 2 is lowered to the lower limit position, the rear extending portions 19, 19 of the lower links 1a, 1a descend relative to the seedling planting device 2, and the left and right upper springs 22, 22 are formed. In the same manner, the spring pitch is set so that the seedling planting device 2 is rolled and locked in the same manner. Further, the operation limit of the rolling operation during the planting work can be regulated by the close contact of either of the springs 22 and 23.

It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Side view of the rear part of rice transplanter

FIG. 2 is a side view of a neutral biasing mechanism arrangement portion.

FIG. 3 is a front view of a neutral biasing mechanism arrangement portion.

FIG. 4 is a perspective view of a bush.

[Explanation of symbols]

 1a, 1a Elevating link 2 Working device 20,20 Rod 21 Bracket 22,23 Spring 25 Detachment support part T Neutral biasing mechanism

Claims (2)

[Claims] 1. A pair of left and right lifting links (1
The working device (2) is connected via a) and (1a) so that it can be moved up and down and left and right, and the working device (2) is biased by the neutral biasing mechanism (T) to return to the rolling neutral position. In addition, the rolling support structure of the working device configured to roll lock the working device (2) at the upper limit position, wherein the working links (1a), (1a) on the working device (2) side are provided. The rods (20) and (20) are pivotally connected to a position on the outer side of the pivot point, and the rods (20) and (20) are connected to the ground work device (2).
Side brackets (21) are inserted along the vertical direction, and springs (22) and (23) are respectively attached to the rods (20) and (20) on the upper and lower sides of the brackets (21). Fit the rod (20),
A retaining support portion (25) is provided at the lower end of (20), the neutral biasing mechanism (T) is constituted by the springs (22) and (23), and the working device (2) is placed at a substantially upper limit position. And the spring (22),
The spring pitch is set so that one (23) of the (23) is in a close contact state, and the spring (23)
Rolling support structure for work equipment configured to be locked by rolling. 2. The pitch of the springs is set so that when the working device (2) is lowered to the lower limit position, the other (22) of the springs (22), (23) is in a close contact state, The rolling support structure for the working device according to claim 1, wherein the spring (22) is configured to perform rolling lock.