JP2858296B2 - Hydraulic bucket drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic bucket driving device which is opened and closed or turned by hydraulic driving.

[0002]

2. Description of the Related Art Conventionally, a hydraulic bucket driving device uses a hydraulic pump to supply power to an engine by a hydraulic pump, and feeds the hydraulic pressure to a hydraulic operating device such as a hydraulic cylinder or a hydraulic motor through an oil supply pipe to provide a hydraulic circuit. Is composed. Then, the switching valve, which is a part of the configuration of the hydraulic circuit, is positioned on both sides of the handle in front of the driver's seat, and the operation valve is operated to a desired position to drive the hydraulic bucket. ing.

[0003] The above-mentioned hydraulic bucket is, for example, an open-close type, and is operated to open and close by one operation.
In another operation, the bucket is turned with respect to the boom to which the bucket is attached.

[0004]

In the above-mentioned conventional apparatus, when a hydraulic open / close type bucket is mounted instead of a normal bucket which is not provided on an existing work vehicle, it is usually one side of the main body. To one actuator
Pressurized oil can be selectively supplied to the hydraulic open / close bucket
Such a switching valve is provided, and the operation of the hydraulic open / close type
It will be operated with the body operation lever, but in this case,
The disadvantage that the main unit and the hydraulic open / close bucket cannot be operated simultaneously
There is. On the other hand, instead of providing such a switching valve,
Of the hydraulic open / close bucket
The main body is operated by an operating valve connected to the
Operate the hydraulic open / close bucket separately from the lever.
However, in this case, the operating lever
Two operations are required, and the main unit and bucket are operated separately.
There is a disadvantage that it has to be operated with a tool.

[0005] In addition, the lever operation has to be performed not only by moving the hand largely but also by a relatively large force, and there is a problem that the operation is difficult.

The present invention solves the above-mentioned drawbacks of the conventional hydraulic bucket driving device, is easy to operate, and has a main body side.
Of the same operation lever as the hydraulic
Also, do not switch the operating direction of the hydraulic open / close bucket.
It can be operated simultaneously.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a work vehicle comprising a lower traveling portion and an upper turning portion, wherein a hydraulic open / close type is provided at the tip of a main body boom provided on the upper turning portion. In a device equipped with a bucket, a body operation valve for switching pressure oil to a body operation actuator
Hydraulic circuit between the valve and its actuator
On the way, the actuator for body operation and the bucket
Pressure oil is supplied to both the work operation actuators
And pressurized oil only to the actuator for work operation
Magnet type that can switch between the state of supplying
The first switching valve is provided, and the workpiece is moved from the first switching valve.
In the middle of the oil path to the action actuator,
For switching the direction of pressure oil flow to the actuator
A second switching valve of a cut type, and the first and second switching valves are provided.
The operation switch for switching the switching valve 2 is
Characterized in that it is attached to the operating lever of the lube.
You.

[0008]

When the main body operating lever is operated, the first switching valve is operated.
Depending on the switching position, the actuator on the
The operating direction of the operating lever simultaneously or independently
It works according to. At this time, the second switching valve is actuated.
By doing so, regardless of the operation direction of the main body operation lever,
The operation direction of the bucket, that is, the opening / closing direction can be changed.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the structure of a hydraulic motor such as an engine serving as a prime mover, a hydraulic pump, a hydraulic motor, and a hydraulic cylinder; Hydraulic pressure comprising a main body operation valve [slewing] 1 and a main body operation valve [bucket] 2 comprising an upper revolving portion including other types of accessory devices and a lower revolving portion (not shown) comprising a traveling device. An operation valve is provided, and a magnet valve 1 'and a magnet valve 2' connected to the operation valves 1 and 2 are provided. Work switches [open / close] arranged on the magnet valves 1 ', 2' and the main body operation levers 4 and 5
Switchboard 4 'and work switch [turn] 5'
And is electrically connected by the transmission line 3 via the. A work rotating motor 7 'and a work rotary joint [opening / closing cylinder] 8' are connected via a piping box 10 and a swivel joint 9 to an oil passage provided in the magnet valves 1 'and 2' by a transport pipe 6. Further, the main body turning motor 7 is connected to an oil passage provided in the magnet valve 1 ′.
This is an operating device of a hydraulic bucket driving device provided with an electric circuit and a hydraulic circuit, which are connected to an oil passage provided in a magnet valve 2 ', in an upper turning portion.

The magnet valves 1 'and 2'
As shown in the figure, a valve box 46 is disposed at a central position thereof, and spool covers 32 and 33 are disposed on both sides of the valve box 46, respectively. The valve box 46 is provided with two first spools 14 and second spools 20 arranged in parallel with each other to constitute first and second switching valves of the present invention. Large spool cases 28 'are provided at both ends of the spools 14 and 20. The large springs 28 are inserted into the large spool cases 28 ', and the spools 14 and 20 are inserted.
Is pressed by the large spring 28 and the spool 14
And 20 are always positioned in their central position, the oil port 12 is always in communication with the oil port 12 ',
The oil port 13 and the oil port 13 'communicate with each other.

The spool 14 has a central portion and three lands formed on the left and right sides of the central portion at desired intervals. Between the spool 14 and the spool 20, oil passages 15 and 16 in the box are arranged, the oil outlet 12 and the oil passage 16 in the box are communicated, the oil inlet 13 and the oil passage 15 in the box are communicated, A hydraulic block 17 is interposed in a connection path between the box oil passage 15 and the box oil passage 16. Further, a hydraulic block body 18 is interposed in an oil passage extending from an intersection of the oil passage 15 in the box, the oil passage 16 in the box, and the end of the connection passage toward the gap of the spool 20, An oil passage between the hydraulic block body 17 and the center gap of the spool 20 has a flow control body 1
9 is interposed.

The spool 20 is formed with four lands through a central portion thereof and voids provided on both left and right sides of the central portion, and communicates between two lands adjacent to the central void. The pressure regulator 21 is interposed in an oil passage whose opening end is normally closed by the surface of the land.
On the other hand, oil ports 12 'and 13' are provided so that they can communicate with the oil ports 12 and 13, respectively, through oil paths.

A spool working oil passage 24 and an oil passage (drain) 25 are connected to large spool cases 28 'provided at both ends of the spools 14 and 20, respectively. A pressure oil removing section 45 is provided at a desired position of an oil path connecting the hydraulic block body 17 and the flow control body 19, and the pressure oil removing section 45 is connected to the spool operating oil path 24. A magnet 31 is disposed at a position close to the large spool case 28 ′ in the spool operating oil passage 24 communicating with the large spool case 28 ′ at one end of the spool 14, and is connected to the large spool cases 28 ′ provided at both ends of the spool 20. Magnets 29 and 30 are arranged near the large spool case 28 'of the communicating spool hydraulic oil passage 24. The magnets 29, 30 and 31 and the magnets 29 ′, 30 ′ and 31 ′ are connected to the pressure oil inlet 24 ′ of the spool hydraulic oil passage 24.
And a drain oil 25 'leading to an oil passage (drain) 25
Can be opened and closed by the small spool 27,
Electricity from the power supply is taken in from the electrodes 34 and 35.

Switches 36, 37, 38 and 39 are provided at the work switch 4 'provided on the main body operation lever 4, and switches 40, 41 and 42 are provided at the work switch 5' provided on the main body operation lever 5. , 43, and are connected to magnets 29, 30, 31 and magnets 29 ', 30', 31 'via a switchboard 44. As a result, the magnets are appropriately excited so that the spool can be actuated, pressure oil is supplied to the appropriate place at the appropriate time, and the magnet valves 1 'and 2', that is, the spools of the spool valves are moved to form a desired flow path. The driven body such as the main body turning motor 7, the work turning motor 7 ', the main body bucket cylinder 8, and the work bucket cylinder 8' can be moved.

Next, the operation resulting from the above configuration will be described. When a switch 36 provided on the main body operation lever 4 is pressed,
The magnet 29 operates to move the spool 20 to the left. As a result, the oil port 22 and the oil port 23 are opened, pressure oil flows from the oil port 22 toward the oil port 23, and the hydraulic motor of the operating body 23 'interposed in the oil passage therebetween operates.

When the switch 37 is depressed, the magnets 29 and 31 operate to move the spool 20 to the left, and the oil port 22 and the oil port 23 are opened, and the pressure from the oil port 22 toward the oil port 23 is increased. Oil flows, and the hydraulic motor of the operating body 23 'interposed in the oil passage therebetween operates, but the oil port 12' and the oil port 13 'on the main body side are operated.
Is blocked.

When the switch 38 is depressed, the magnet 30 operates to move the spool 20 to the right.
2 and the oil inlet / outlet 23 are opened, pressure oil flows from the oil inlet / outlet 23 to the oil inlet / outlet 22, and the hydraulic motor of the operating body 23 'interposed in the oil passage therebetween presses the switch 36 in the opposite direction. Activate

When the switch 39 is depressed, the magnets 30 and 31 operate to move the spool 20 to the right.
The oil port 22 and the oil port 23 are opened, and the oil port 2 is opened.
3, the pressure oil flows toward the oil inlet / outlet 22, and the hydraulic motor of the operating body 23 'interposed in the oil passage therebetween operates in the opposite direction when the switch 36 is pressed. And the oil port 13 'is blocked.

When the switch 40 provided on the main body operation lever 5 is pressed, the magnet 31 'operates to move the spool 14 to the right, and the main body side oil port 12' and oil port 13 'are blocked. At that time, the oil port 22 and the oil port 23 are closed.

When the switch 41 is pressed, the magnet 3 is pressed.
0 'works, the spool 20 moves to the right, and the oil port 22
Then, the oil inlet / outlet 23 is opened, pressure oil flows from the oil inlet / outlet 23 to the oil inlet / outlet 22, and the operating body 23 'interposed in the oil passage therebetween operates.

When the switch 42 is pressed, the magnets 29 'and 31' operate to move the spool 20 to the left, the oil port 22 and the oil port 23 are opened, and pressure oil flows from the oil port 22 to the oil port 23. It flows, and the operating body 23 ′ interposed in the oil passage therebetween operates in the direction opposite to the case where the switch 41 is pressed. Then, the oil port 12 'and the oil port 13' are blocked.

When the switch 43 is pressed, the magnet 30 'and the magnet 31' act to move the spool 20 to the right, the oil port 22 and the oil port 23 are opened, and the pressure oil flows from the oil port 23 to the oil port 22. Flows, and the operating body 23 ′ interposed in the oil passage therebetween operates in the same direction as when the switch 41 is pressed. And the oil doorway 12 '
And the oil inlet / outlet 13 'is blocked.

In addition, a pressure regulator 21 such as a pressure regulating valve is provided at an appropriate position of the oil passage provided in parallel with the oil passage interposed with the operating body 23 ', so that the discharge pressure of the hydraulic pump is increased and the pump is overloaded. If the pressure of the pressure oil discharged from the pump is over-pressurized by more than a certain pressure, the pressure regulating valve will open and damage to the pump or other parts due to the abnormally high oil pressure may occur. Can be prevented.

[0024]

As described above, according to the present invention, the main body
Both the actuator on the side and the hydraulic opening / closing bucket are the same
Can be operated with the body operation lever and operate these
In this case, there is no need to change the lever. Moreover,
The second switching valve provided downstream of the first switching valve allows the
Opening / closing bucket operating direction with respect to body operating lever operating direction
Can be changed, these main body and bucket
When operating both sides at the same time
The direction of bucket movement can be selected
There is an effect that. That is, do not turn the main body to the left.
The bucket can be closed and opened, which improves work efficiency
Can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a hydraulic bucket driving device according to the present invention.

FIG. 2 is a conceptual diagram of an operating device showing a relationship between a hydraulic circuit diagram and an electric circuit diagram of the hydraulic bucket driving device shown in FIG.

FIG. 3 is an electric circuit diagram showing a part of an electric operating device of the operating device of the hydraulic bucket driving device according to the present invention.

FIG. 4 is a circuit diagram of a part of a hydraulic circuit in the circuit diagram of the operating device shown in FIG. 2;

FIG. 5 is a detailed view of a valve device showing a relation between a magnet and a magnet valve which are constituent elements of the present invention and a relation between a spool which is a main part of the magnet valve and an oil port.

FIG. 6 is a drawing for understanding an opening / closing state of an oil passage between a small spool and a large spool case operated by a magnet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body operation valve [swivel] 1 'Magnet valve 2 Main body operation valve [bucket] 2' Magnet valve 3 Power transmission line 4 Main body operation lever [bucket] 4 'Work switch [open / close] 5 Main body operation lever [swivel] 5' Work switch [Swing] 6 Oil feed pipe 7 Main body turning motor 7 'Work turning motor 8 Main body bucket cylinder 8' Work rotary joint [opening / closing cylinder] 9 Swivel joint 10 Piping box 11 Switchboard 12 Oil inlet / outlet 12 'Oil inlet / outlet 13 Oil inlet / outlet 14 Spool (first switching valve) 15 Oil passage in box 16 Oil passage in box 17 Hydraulic block body 18 Hydraulic block body 19 Flow control body 20 Spool (second switching valve) 21 Pressure regulator 22 Oil inlet / outlet 23 Oil inlet / outlet 23 'working body 24 sp Oil passage 24 'left oil inlet 25 oil passage [drain] 25' drain oil port 26 spool small spool 27 small spring 27 'small spool 28 large spring 28' large pool case 29 magnet [spool left] 29 'magnet [ Spool left] 30 Magnet [spool right] 30 'Magnet [spool right] 31 Magnet [spool right] 31' Magnet [spool right] 32 Sprue cover 33 Spool cover 34 Electrode [+] 35 Electrode [-] 36, 29 Switch 37 , 29, 31 switch 38, 30 switch 39, 30, 31 switch 40, 31 'switch 41, 30 switch 42, 29', 31 'switch 43, 30', 31 'switch 44 switchboard 45 pressure oil removing part 46 valve box

Claims (1)

(57) [Claims] 1. A work vehicle comprising a lower traveling portion and an upper turning portion, wherein a hydraulic open / close type bucket is provided at a tip end of a main body boom provided in the upper turning portion, wherein pressure oil to a main body operating actuator is supplied. Switchable body operation valve
In the hydraulic circuit between the
Inside, the actuator for body operation and the bucket
Supplying pressure oil to both actuators
Pressure oil only to the work operation actuator side.
Magnet type that can switch between supply state
A first switching valve is provided, and a work operation is performed from the first switching valve.
In the middle of the oil path to the actuator
Magnet that switches the direction of pressure oil flow to the actuator
And a second switching valve of the
The operation switch for switching the switching valve of
Hydraulic opening and closing type, which is attached to the operating lever of the valve
Bucket drive.