JPH04271703A - Connecting apparatus for tractor working machine - Google Patents

Abstract

PURPOSE:To facilitate the connection work of a working machine to a vehicle of a tractor working machine. CONSTITUTION:A lift cylinder 5 is attached in vertically movable manner to a vehicle 1 and lift links 2, 3 are attached in vertically movable manner to a working machine 4 to allow the connection between the link hitch 8 of the vehicle 8 and the cylinder hitch 6 of the lift cylinder 5 and between the link hitch 9 of the lift links 2, 3 and the cylinder hitch 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device for a tractor working machine, and can be used for a seedling planting machine, a fertilizing seeding machine, and other working machines.

0002

[Prior Art and Problems to be Solved by the Invention] In a configuration in which a work machine is connected to a tractor body, generally a lift link consisting of a parallel link, a lower link, a top link, etc. that is raised and lowered by a lift cylinder on the vehicle body side is used. of,
The lift link was installed on the same vehicle body side, and the work equipment was connected to the rear end of the lift link. Further, there is a technique disclosed in Japanese Patent Application Laid-open No. 124407/1983 as a form in which a lift link is provided on the working machine side, and this lift link is provided with a lift cylinder.

In both cases, the lift link is equipped with a lift cylinder that is operated by hydraulic pressure or the like, so the connection between the lift cylinder and the lift link must be separated so that the expansion and contraction of the lift cylinder is not restricted. It is complicated and troublesome because it requires configuration such as storage, operation, etc.

0004

[Means for Solving the Problems] The present invention provides a tractor working machine in which a working machine 4 is connected to a vehicle body 1 via lift links 2 and 3 so as to be able to move up and down.
side lift cylinder 5 and work machine 4 side lift link 2,
3, and link hitches 8, 9 that connect the vehicle body 1 and the lift links 2, 3.

[0005]

[Operation and Effects of the Invention] When connecting the work equipment 4 to the vehicle body 1, approach the lift links 2 and 3 of the work equipment 4 with the lift cylinder 5 of the vehicle body 1 facing them, and While moving the lift cylinder 5 and the lift links 2 and 3 on the working machine 4 side up and down, the cylinder hitch 6 on the lift cylinder 5 side and the cylinder hitch 7 on the lift links 2 and 3 side are moved up and down.
At the same time, the link hitch 9 on the lift links 2 and 3 side is connected to the link hitch 8 on the vehicle body 1 side.

[0006] In this way, the lift cylinder 5
Since the lift links 2 and 3 are separately provided on the work machine 4 side so as to be able to move up and down, the cylinder hitches 6 and 7 that connect them are connected, and the link hitches 8 and 9 connection operations are easily performed. In addition, when utilizing the telescopic operation of the lift cylinder 5 during such connection work, the lift cylinder 5 is telescopically operated by connecting the cylinder hitch 7 of the lift links 2 and 3 and the cylinder hitch 6 of the lift cylinder 5. When the lift links 2 and 3 and the cylinder hitch 7 are pulled toward the vehicle body 1 side, the link hitch 9 on the lift links 2 and 3 side is pulled and connected to the link hitch 8 on the vehicle body 1 side.

When performing such a connecting operation, the lift cylinder 5 is connected by connecting the cylinder hitches 6 and 7.
operate the cylinder hitch 7 and lift link 2,
3 toward the vehicle body 1 side, the link hitch 9 of the working machine 4 is connected to the link hitch 8 of the vehicle body 1, making the connection operation simpler and easier. By expanding and contracting the lift cylinder 5 in the connected state of the link hitch 9, the lift links 2 and 3 are moved up and down with respect to the vehicle body 1,
The work machine 4 is raised and lowered. Also, when disconnecting the work equipment 4, disconnect the cylinder hitch 6 of the lift cylinder 5 and the cylinder hitch 7 of the lift links 2 and 3,
This is done by disconnecting the link hitch 8 of the vehicle body 1 and the link hitch 9 of the lift links 2 and 3.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated example, a working machine 4 consisting of a seedling planting device or the like is connected to the rear of a tractor body 1. A connecting frame 10 for connecting the upper and lower lift links 2 and 3 is provided at the rear end of the vehicle body 1, and left and right hooks 1 are provided on the upper part of the connecting frame 10.
1, and a pair of left and right link hitches 8 are provided at the bottom. Of these, the hook 11 can be opened at the top so that both ends of the link pin 13 at the front end of the lift link 2 on the working machine 4 side can be fitted from above, and the link hitch 8 has a catch seat that is opened to the rear. 12, and the open part of this catch seat 12 is connected to a spring 14.
It consists of an opening/closing pin 15 in the vertical direction that can be opened against the pressure, and an inclined surface 16 is formed at the tip of the opening/closing pin 15, and a link hitch 9 at both ends of the link pin at the front end of the lift link 3 is formed. By pressing the opening/closing pin 15 against the inclined surface 16, the opening/closing pin 15 can be pushed open against the spring 14, and the link hitch 9 can be fitted into the catch seat 12. , the opening/closing pin 15 is connected to the spring 1
4 to prevent the link hitch 9 from coming off. Further, the opening/closing pin 15 is provided with a handle 29 for rotating the opening/closing pin 15 itself, a stopper 30 for locking the opened position with respect to the catch seat 12, etc., and the link hitch 9
When fitting into the catch seat 12, the opening/closing pin 15 is opened against the spring 14, the stopper 30 is locked to the bracket 31 below the catch seat 12, and the inclined surface 16 is directed toward the open part. When the link hitch 9 is fitted into the catch seat 12, the stopper 30 is attached to the bracket 3 by turning the handle 29.
By fitting into a notch 32 formed in a part of the pin hole 1, the opening/closing pin 15 closes the opening by the force of the spring 14.

[0009] Furthermore, the lift links 2 and 3 are connected to the work machine 4.
Link pins 19 and 20 are installed above and below a link bracket 18 that is rollably provided at the front of the fuselage 17.
The lift links 2 and 3 constitute a parallel link mechanism. The link pin 13 at the front end is integral with the lift link 2 at the upper part, has a lift arm 22 integrally protruding from the lower side, and has a cylinder hitch 7 at the lower end to which a cylinder hitch 6 at the tip of the lift cylinder 5 can be connected. It is set up.

This cylinder hitch 7 forms a catch seat 23 that opens forward, and a vertical opening/closing pin 24 is provided in the open part of the catch seat 23, and is always set in the closing direction by the spring of a spring 25. By manually opening the opening/closing pin 24 against the spring 25, the cylinder hitch 6 on the lift cylinder 5 side can be fitted into the seat 23. The lift cylinder 5 has a cylinder portion pivoted to a part of the vehicle body 1 via a connecting pin 26 so as to be able to move vertically, and a piston 27 of the lift cylinder 5 that is controlled to expand and contract by hydraulic pressure is attached to the tip end by a spring 28. The fired pin is made to protrude to the left and right and the catch seat 23
It constitutes a cylinder hitch 6 that can be fitted into the cylinder hitch 6. The expansion/contraction control of the lift cylinder 5 is configured such that the lift control valve 34 of the hydraulic circuit is controlled manually or automatically by using a control device or other operating lever 33, an operating section of the working machine 4, or the like.

The tractor body 1 has a front wheel 36 and a rear wheel 37 that are steered by a steering handle 35, and is driven by an engine 39 under the driver's seat 38 transmitting power to the front wheels 36 and rear wheels 37. It has a four-wheel drive mode, and the power take-off shaft 40 is connected to the transmission part of the seedling planting machine 4,
The system is designed to allow seedling planting work to be carried out. This seedling planting machine 4
A seedling feeding device 41 that accommodates and feeds out seedlings, a planting device 42 that separates the seedlings fed from the seedling feeding device 41 and plants them on the soil surface, and a seedling feeding device 42 that is installed on the lower side of the seedling planting machine 17. It consists of a float 43 that slides on the soil surface while supporting the seedling planting machine 4 itself to level the soil surface on which the seedlings are planted, and is rotatably provided around the rolling shaft 44 with respect to the link bracket 18.

A fertilization device consisting of a fertilization hopper 45, a fertilizer feeding device 46, a fertilization pipe 47, etc. is attached to the front of the seedling planting machine 4 above the link hitch 21, and is used for seedling planting and the like. The structure is such that fertilizer is applied at the same time. Reference numeral 48 denotes supporting legs for supporting the working body 17 of the seedling planting working machine 4, which has a roller 49 at its lower end and is configured to be foldable and stored at both left and right sides of the working body 17. Reference numeral 50 denotes a support leg supporting the lift link 3, which has a grounding roller 51 at its lower end and is configured to be foldable and stored. These supporting legs 48, 50, etc. are used to ground the working machine 4 when it is stored when not in use, and the vehicle body 1 can be brought close to the working machine 4 in this state and connected to it, or can be detached from it.

As an example of the lift control valve 34, the lift control valve 34 of the hydraulic circuit is switched by vertical swinging of the float 43 of the seedling planting machine 4, and the lift cylinder 5 is expanded and contracted. The lift control valve 34 is used to attach and detach the working machine 4 to and from the vehicle body 1.

For this purpose, a lift control valve 34 and a sub-valve 53 are provided in the hydraulic circuit 52 of the lift cylinder 5 connected to the pump port P and the tank port T, and these valves 34 and 53 are interlocked by the operating lever 33. Lift control valve 3
The switching of the lift control valve 34 to the ascending side and the switching of the sub-valve 53 to the ascending side are synchronized (FIG. 7), and the switching of the lift control valve 34 to the descending side and the switching of the sub-valve 53 to the descending side are synchronized. (FIG. 8), the lift cylinder 5 can be extended or contracted by switching the operating lever 33.

When connecting the working machine 4, the hydraulic circuit 5
In a configuration in which the two hydraulic pumps are provided on the vehicle body 1 side and the lift control valve 34 is provided on the work equipment 4 side, the hydraulic pressure 52 between them may be configured such that they can be connected or separated by a hydraulic pipe. It's convenient. In addition, the power take-off shaft 40 for the work machine 4 is configured to be able to be joined and separated near the link hitches 8 and 9, so that the link hitches 8 and 9 can be connected to the power take-off drive shaft on the drive side of the vehicle body 1. At the same time, it is preferable to adopt a structure that allows connection by coupling or the like.

[Brief explanation of the drawing]

The figure shows one embodiment of the invention.

FIG. 1 is a side view of a connecting portion between a vehicle body and a lift link.

FIG. 2 is a perspective view of a link hitch portion on the vehicle body side.

FIG. 3 is a perspective view of the cylinder hitch portion on the lift link side.

FIG. 4 is a rear view of the rear end of the vehicle body.

FIG. 5 is a front view of the front end of the lift link.

FIG. 6 is a side view showing the tractor working machine in a removed state.

[Fig. 7] Hydraulic circuit diagram.

FIG. 8 is a hydraulic circuit diagram.

[Explanation of symbols]

1 Vehicle body 2 Lift link 3 Lift link 4 Work equipment 5 Lift cylinder 6 Cylinder hitch 7 Cylinder hitch 8 Link hitch 9 Link hitch

Claims (1)

[Claims] Claim 1: In a tractor working machine in which a working machine 4 is connected to a vehicle body 1 via lift links 2 and 3 so as to be able to rise and fall freely, a lift cylinder 5 on the side of the vehicle body 1 and a lift on the side of the working machine 4 are both movable up and down. A coupling device provided with cylinder hitches 6 and 7 that can connect between links 2 and 3, and link hitches 8 and 9 that connect between the vehicle body 1 and lift links 2 and 3.