JPS6225822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work machine control device for a loading machine.

This type of conventional work machine control device is the first
As shown in the figure, the stay cylinder b of work machine a
An auxiliary cylinder c is installed between the boom d and the stake arm e, and the rod and head sides of the auxiliary cylinder c and boom cylinder f are connected with piping g and h, and the oil in the auxiliary cylinder c is drained. The feed station arm e and boom d were linked to the boom cylinder f to level the bucket i during reach.

However, an extra cylinder (auxiliary cylinder) was added to the work machine where there was limited space, making it expensive and reducing the degree of freedom in design.Moreover, the number of piping in the possible parts of the work machine increased, making it expensive and reliable. sex was decreasing.

Furthermore, it is disadvantageous in terms of strength to attach an extra cylinder to the work machine link part, which is difficult to strengthen.

The present invention was made in view of the above circumstances, and its purpose is to automatically level the bucket by simply operating the reach control valve, to enable smooth excavation of the floor surface, and to have a large reach. To provide a loader control device which can obtain a stroke and has a simple structure.

The present invention will be explained below with reference to FIG.

In the drawings, numeral 1 is the suspension, and numeral 2 is the vehicle body, which is an upper rotating body.

A bracket 3 is fixed to this vehicle body 2,
The lower end of the reach link 4 is swingably attached to the rear of the bracket 3 with a pin 5, and a reach cylinder 7 for swinging the reach link 4 is provided on the bracket 6 of the vehicle body 2.

A base end of a boom 8 is attached to the upper end of the reach link 4 with a pin 9 so as to be able to raise and lower, and a boom cylinder 10 for raising and lowering the boom 8 is attached to the bracket 3 of the vehicle body 2.

A stake arm 11 is attached to the tip of the boom 8 with a pin 12 so that it can be raised and lowered, and a stake cylinder 13 for raising and lowering the stake arm 11 is provided on the boom 8.

Bucket 1 is attached to the tip of stake arm 11.
4 is swingably attached, and the boom 8 is provided with a bucket cylinder 15 for swinging the bucket 14.

16 in the drawing is a branch control valve,
17 is a stake control valve, and 18 is a reach control valve.

The diversion control valve 16 is the first auxiliary valve 19
, a second auxiliary valve 20 and flow dividers 21 and 24.

Port 18a of reach control valve 18
communicates with pump 22, and port 18b communicates with tank 23.

Further, the port 18c of the reach control valve 18 communicates with the port 21a of the flow divider 21. Port 21 of this flow divider 21
b, 21c are ports 19a, 1 of the first auxiliary valve 19
It leads to 9b.

Further, the port 18d of the reach control valve 18 communicates with the port 24a of the flow divider 24, and the port 24b of the flow divider 24,
24c is the port 19c, 19d of the first auxiliary valve 19
It is familiar to

Further, hydraulic pressure is introduced from ports 18c and 18d of the reach control valve 18 to switching operation ports 19e and 19f of the first auxiliary valve 19.

The port 19h of the first auxiliary valve 19 communicates with the head side of the reach cylinder 7 via the piping 25.
Port 19i communicates with the rod side of reach cylinder 7 via piping 26.

Ports 19j and 19k of the first auxiliary valve 19 are connected to the second
It communicates with ports 20a and 20b of the auxiliary valve 20.

The port 17a of the stake control valve 17 communicates with the pump 27;
b leads to tank 28. Port 17c of stake control valve 17 communicates with port 20c of second auxiliary valve 20 via piping 29, and port 17d communicates with port 20d via piping 30, respectively.

Port 1 of stake control valve 17
Hydraulic pressure is introduced into switching operation ports 20f and 20g of the second auxiliary valve 20 from ports 7c and 17d.

The port 20h of the second auxiliary valve 20 communicates with the head side of the stake cylinder 13 via a pipe 31, and the port 20i communicates with the rod side of the stake cylinder 13 via a pipe 32.

Next, the operation will be explained.

The reach control valve 18 is operated to position the position on the port side and oil is supplied to the flow divider 21 via the pipe 33. Since the oil flowing through the pipe 33 is introduced into the operating port 19e of the first auxiliary valve 19, the position I' of the first auxiliary valve 19 is located on the port side, and the oil enters the head side of the reach cylinder 7 via the pipe 25. At the same time, the oil flows to the neutral position RO' of the second auxiliary valve 20. The oil flowing into the neutral position RO' enters the head side of the stay cylinder 13.

Also, the oil on the rod side of the stay cylinder 13 and the rod side of the reach cylinder 7 is stored in a tank 23.
is drained.

For this purpose, the reach cylinder 7 and the stake cylinder 13 extend together to push out the stake arm 11 via the boom 8, and the stake cylinder 13 swings the stake arm 11 to raise the position of the bucket belt 14. Smooth excavation of the floor surface will be carried out.

In this case, the reach link 4 and the stake arm 11 work together to push out the bucket 14, so a large reach stroke can be obtained.

When moving the bucket 14 rearward, the reach control valve 18 is operated to position the position rotor toward the port side.

Further, by operating the stake control valve 17, the second auxiliary valve 20 is switched, and the stake cylinder 13 is operated by operating the stake control valve 17 alone.

As described in detail above, the work machine control device for a loading machine according to the present invention is such that one end of the reach link 4 is provided on the vehicle body 2 so that it can be raised and lowered, and the base end of the boom 8 is attached to the other end of the reach ring 4. The base end of the stake arm 11 is provided at the tip of the boom 8 so as to be able to raise and lower, and the bucket belt 14 is swingably provided at the tip of the stake arm 11, and a reach link is provided on the vehicle body 2 side. A reach cylinder 7 for raising and lowering the stake arm 11 is provided on the vehicle body 2 side, and a boom cylinder 10 for raising and lowering the boom 8 is provided on the vehicle body 2 side.
A reach control valve 18 provided in a hydraulic operating circuit of a reach cylinder 7 in a loading machine equipped with a bucket cylinder 15 that performs rocking as shown in FIG.
and flow dividers 21 and 24 that are provided in the hydraulic operation circuit of the reach cylinder 7 and divide the oil sent from the reach control valve 18 into two directions.
It is provided in the hydraulic operating circuit of the reach cylinder 7 and is switched by the hydraulic pressure on the inlet side of the flow dividers 21 and 24 to transfer the oil diverted from the flow dividers 21 and 24 to the reach cylinder 7 side and the hydraulic operating circuit of the stay cylinder 13. First auxiliary valve 1 that supplies to the side
9, and a stake control valve 17 provided in the hydraulic operating circuit of the stake cylinder 13.
and the stay control valve 17 provided in the hydraulic operating circuit of the stay cylinder 13.
The hydraulic pressure on the outlet side operates the stake cylinder 13 together with the switching operation of the stake control valve 17, and the oil diverted from the flow dividers 21 and 24 in the neutral state is transferred to the stake cylinder 13 through the neutral position rotor'. This is characterized by comprising a second auxiliary valve 20 for supplying the fuel.

Therefore, when the reach control valve 18 is switched and oil is supplied to the first auxiliary valve 19 via one of the flow dividers, this oil pressure causes the first auxiliary valve 19 to be supplied with oil.
The auxiliary valve 19 is switched so that a portion of the oil is supplied to the reach cylinder 7, and the remaining oil is supplied to the stay cylinder 13 via the neutral position rotor of the second auxiliary valve 20.

For this purpose, the reach cylinder 7 is actuated to move the boom 8 via the reach link 4, and the stay cylinder 13 is actuated to move the stick arm 11, thereby smoothing the floor surface of the bucket 14. In this way, just by operating the reach control valve 18, the leveling of the bucket is automatically performed and smooth excavation of the floor surface is possible.
Since the reach link 4 and stake arm 8 work together to push out the bucket 14, a large reach stroke can be obtained.

In addition, the first and second auxiliary valves 19, 20 and the flow divider 2 are provided between the conventional work machine control valve and the cylinder.
Since only 1 and 24 are placed, the structure becomes simple. Further, when the reach link 4 is pushed out, the boom 8 not only reaches but also moves downward, so that the weight of the boom 8 can be used for the reach force, so the reach force can be increased by the weight of the boom.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional work machine control device for a loading machine, and FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention. 2 is the vehicle body, 4 is the reach link, 7 is the reach cylinder, 8 is the boom, 11 is the stake arm, 1
3 is a stick cylinder, 18 is a reach control valve, 19 is a first auxiliary valve, 20 is a second auxiliary valve, and 21 and 24 are flow dividers.

Claims (1)

[Claims] 1 One end of the reach link 4 is provided on the vehicle body 2 so that it can be raised and lowered, and the base end of the boom 8 is connected to the other end of the reach link 4 so that it can be raised and lowered, and the base end of the stay arm 11 is connected to the tip of the boom 8. A bucket belt 14 is swingably provided at the tip of the stake arm 11, and a reach cylinder 7 for raising and lowering the reach link 4 is provided on the vehicle body 2 side, and a boom 8 can be raised and lowered on the vehicle body 2 side. In the loading machine, the boom 8 is provided with a boom cylinder 10 for operation, and the boom 8 is provided with a stay cylinder 13 for raising and lowering the stay arm 11 and a bucket cylinder 15 for swinging the bucket 14. reach control valve 18 provided in the hydraulic operation circuit of the reach cylinder 7, flow dividers 21 and 24 that are provided in the hydraulic operation circuit of the reach cylinder 7 and divide the oil sent from the reach control valve 18 in two directions, and the reach cylinder 7. The flow divider 2 is provided in the hydraulic operation circuit and is switched by the hydraulic pressure on the inlet side of the flow dividers 21 and 24.
a first auxiliary valve 19 that supplies oil separated from the reach cylinder 7 side and the hydraulic operating circuit side of the stay cylinder 13;
The stake control valve 17 provided in the hydraulic operation circuit of No. 3 and the stake control valve 17 provided in the hydraulic operation circuit of the stake cylinder 13 is switched by the hydraulic pressure on the outlet side of the stake control valve 17. The present invention is characterized in that it is equipped with a second auxiliary valve 20 which operates the stay cylinder 13 together with the switching operation and supplies the oil diverted from the flow dividers 21 and 24 to the stay cylinder 13 through the neutral position rotor' when in the neutral position. Loading machine work equipment control device.