JPH03183823A - Controller of front loader attached to tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic control device for a tractor-mounted front loader.

(Prior art) In a tractor-mounted front loader, the front loader is detachable so that the tractor can be used for various tasks, and the two valves that hydraulically control the boom cylinder and implement cylinder are attached to the front loader. attached to the side.

These two valves are manually operated using control levers, but they are difficult to operate because they are far from the tractor driver's seat.
Furthermore, if a vehicle is equipped with a cabin, the windshield of the cabin becomes an obstacle, so a model has been devised in which the two valves are electromagnetic and operated by a switch near the driver's seat.

(Problem to be solved by the invention) Electromagnetic valves are more expensive than manually operated valves;
Adopting electromagnetic type for both leads to increased cost,
It is also conceivable to provide manually operated valves on the tractor body side, but it is difficult to create a space for installing two new valves and a lever operation space near the driver's seat of the tractor.

By the way, a tractor is usually equipped with a hydraulic system for lifting and lowering the work equipment at the rear, and an auxiliary control valve for operating an auxiliary actuator is installed near this hydraulic system, and this valve is manually operated. It becomes.

The present invention uses the auxiliary manually operated valve to hydraulically control one cylinder of the front loader, and makes the other cylinder control valve electromagnetic and attaches it to the front loader side. An object of the present invention is to provide a hydraulic control device for a tractor-mounted front loader that can solve the various problems described above by providing a switch for operating the manually operated valve on the lever of the manually operated valve.

(Means for Solving the Problem) A specific configuration for solving the problem in the present invention is that a boom 15 that is raised and lowered by a boom cylinder 17 is pivotally supported on a mast 14 fixed to the tractor body 4, and the tip of the boom 15 is The work tool 1 is rotated by the work tool cylinder 18 to
In a tractor-mounted front loader that pivots on 6,
A valve 19 for hydraulically controlling one of the boom cylinder 17 and the work tool cylinder 18 is made electromagnetic and attached to the front loader 12 side, and a valve 10 for hydraulically controlling the other cylinder is manually operated using an operating lever 25. The electric switch 26 for operating the electromagnetic valve 19 is provided on the operating lever 25.

(Function) Manually operated valve 10 installed on the tractor body 4 side
When the operating lever 25 is rotated, the boom cylinder 1
7 is controlled to raise or lower the boom 15, and when the electric switch 26 provided at the upper end of the operating lever 25 is operated, the electromagnetic valve 19 attached to the front loader 12 side opens.
is operated, the work implement cylinder 18 is controlled, and the work implement 1
Move up and down 6.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a tractor, and a tractor body 4 is formed by directly connecting an engine 2, a solution case 3, etc., and then a hydraulic system 5 for raising and lowering the working machine is mounted on the upper part. A driver's seat 6 is arranged, a control section 8 having a handle 7 and operating levers, etc. is formed in front of the driver's seat 6, and a cabin 9 that covers the driver's seat 6 and the control section 8 is mounted on the tractor body 4. . A manually operated auxiliary control valve 10 is provided within or near the hydraulic system 5.

Reference numeral 12 designates a front loader, in which a mast 14 is detachably attached to a support stand 13 fixed to the left and right sides of the tractor body 4, a base of a boom 15 is pivotally supported at the upper end of the mast 14, and a bucket is attached to the tip of the boom 15. , work tools such as forks 1
A boom cylinder 17 is provided between the mast 14 and the boom 15 to raise and lower the boom 15, and a boom cylinder 17 is provided between the boom 15 and the work tool 16 to rotate the work tool 16 in the vertical direction. A work implement cylinder 18 is provided.

A work tool cylinder 18 is mounted on one of the left and right masts 14.
An electromagnetic valve 19 is provided for hydraulically controlling the.

In Figure 1.2, 21 is a hydraulic pump driven by the engine 2, and its discharge oil is supplied to the auxiliary control valve 1.
0 to the hydraulic system control valve 22, and the hydraulic system 5
cylinder 23 is activated.

The auxiliary control valve 10 operates the spool 24 with a control lever 25, and controls pressure oil to extend and retract the boom cylinder 17. The auxiliary control valve 10 is located below the cabin 9, and the operating lever 25 protrudes into the cabin 9 and is placed on the side of the driver's seat 6. An electric switch 26 is provided at the tip of the operating lever 25. The swinging of the electrical switch 26 and the swinging of the electric switch 26 can be operated with one hand.

The oil discharged from the hydraulic pump 21 is also supplied to an electromagnetic valve 19, and this electromagnetic valve 19 is connected to the electric switch 2.
Operated by 6. The electromagnetic valve 19 is of a three-position switching type, and therefore the electric switch 26 also has contacts before and after the neutral position.

The auxiliary control valve 10 and the boom cylinder 17, and the electromagnetic valve 19 and the working tool cylinder 18 are connected by a vibrator or a flexible hose that can be connected and disconnected by a quick coupler 27, respectively. All hydraulic piping such as hoses is provided outside the cabin 9.

Note that the boom cylinder 17 and the electromagnetic valve 19 may be connected to each other, and the work tool cylinder 18 and the manually operated valve IO may be connected to each other.

3 to 7 show examples of working tools in lift devices, wheel loader devices, etc., and can also be applied when the working tool 16 of the front loader 12 of the above embodiment is a fork.

In the first example shown using the lift device in FIG. 3.4, a lifting platform 32 is provided on a mast 31 rotatably mounted on the tractor body 4 so as to be rotatable around a horizontal axis, and the lifting platform 32 is movable up and down. A rectangular frame-shaped mounting base 33 is attached to the mounting base 33, and left and right pairs of forks 34 are welded or provided on the mounting base 33 so that the left and right positions can be freely adjusted.

A packet 35 has a bottom wall 35a, a back wall 35b, and left and right side walls 35c, and a profile 36 is welded to the upper surface of the bottom wall 35a to form left and right insertion holes 37 open to the back wall 35b. ing.

The packet 35 is fixed by inserting the horizontal part 33a of the fork 33 into the left and right insertion holes 37, and passing a bolt 39 through the back wall 35b and a fitting 38 applied to the back of the vertical part 33b of the fork 33. , attached to the fork 34, allowing the lifting device to perform packet operations instead of fork operations.

FIG. 5.6 shows a second example, in which a groove 4 which is open downward is formed by a profile 36 in place of the insertion hole 37 in the bottom wall 35b of the packet 35.
A reinforcing plate 41 having a through hole 41a for the horizontal part 34b in the rear part is applied to the lower surface of the horizontal part 34a arranged in the groove 40, and a plurality of shapes, the horizontal part 34a and the reinforcing plate 41 are It is fixed by passing through the bolt 42.

The reinforcing plate 41 is attached to the bottom of the packet 35 and the fork 34.
This can be used in the first example as well, in which case the bolt 42 is screwed into the bottom wall 35a to prevent the bolt tip from protruding into the insertion hole 37. do. Further, it is preferable that a recess into which the head of the bolt 42 fits is formed in the lower surface of the reinforcing plate 41 on both sides to prevent the head of the bolt 42 from touching the ground during work.

Further, the fitting 38 for fixing the back wall 35a of the packet 35 to the vertical portion 34b may be U-shaped in plan view as shown in FIG. It's okay.

In this way, by detachably attaching the packet 35 to the fork 34, it is possible to perform two types of work with one device, reducing equipment costs, making it easy to change the work, and increasing the strength of the packet. can be improved.

(Effects of the Invention) According to the present invention described in detail above, the valve 19 for hydraulically controlling one of the boom cylinder 17 and the work tool cylinder 18 is made electromagnetic and is attached to the front loader 12 side, and the valve 19 is attached to the front loader 12 side, The valve 10 for hydraulically controlling the valve 10 is manually operated using an operating lever 25 and is attached to the tractor body 4, and the operating lever 25 is provided with an electric switch 26 for operating the electromagnetic valve 19, thereby eliminating the need for an expensive electromagnetic valve. Since there is only one manual operation valve IO, it is possible to use the auxiliary control valve provided on the tractor itself, which saves installation space and levers. There is no need to create a new operation space, and since the electric switch 26 for the electromagnetic valve 19 is provided on the operation lever 25, there is no need to newly install a switch mounting part, and the switch can be easily operated.

[Brief explanation of drawings]

Fig. 1.2 shows an embodiment of the present invention, Fig. 1 is a circuit diagram of a control device, Fig. 2 is a side view of a tractor equipped with a front loader, and Figs. 3 to 7 are working tools in a lift device, etc. Figure 3 is a partial cross-sectional side view of the first example;
Fig. 4 is an exploded perspective view of the fork-mounted packet of the first example, Fig. 5 is a sectional side view of the second example, Fig. 6 is a perspective view of the reinforcing plate, and Fig. 7 shows the other side of the metal fitting. FIG. ■... Tractor, 4... Tractor body, 5... Hydraulic system, 6... Driver's seat, 10... Auxiliary control valve,
12...Front loader, 14...Mast, 15.
...Boom, 16...Work tool, 17...Boom cylinder, 18...Work tool cylinder, 19...Solenoid valve, 21...Hydraulic pump, 22...Hydraulic system control valve, 26...Electric switch. Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] (1) A boom (15) that is raised and lowered by a boom cylinder (17) to a mast (14) fixed to the tractor body (4)
), and in a tractor-mounted front loader in which a work implement (16) is pivotally supported at the tip of the boom (15) and rotated by a work implement cylinder (18), the boom cylinder (17) and the work implement cylinder The valve (19) that hydraulically controls one of the cylinders (18) is made electromagnetic and is attached to the front loader (12), and the valve (10) that hydraulically controls the other cylinder is operated manually using the operating lever (25). Control of a tractor-mounted front loader, characterized in that it is operable and attached to the tractor body (4) side, and the operation lever (25) is provided with an electric switch (26) for operating the electromagnetic valve (19). Device.