JPH01131733A - Angle control device for frontloader working tool - Google Patents

Abstract

PURPOSE:To attain easy operation and efficiency by equipping a operating lever with an interlocking device, which actuates when a working tool of a machine comes to the upper position of swing movement, and providing a means which shifts the interlocking device to an actuating position. CONSTITUTION:An operating lever 14 is equipped with an interlocking device 38, which can engage with another interlocking device 39 installed on the locking side when a working tool of a machine comes to the upper position of swing movement. Then, by using an operating means 50 installed on the lever 14, shifting of the interlocking device 39 can be made to the locking position. By shifting the lever 14 to the upper swing movement position, the interlocking devices 38 and 39 can be engaged, leaving the lever 14 locked at that position. With these operation, the working tool starts to swing upward around an axis of the boom end. When it reaches a height at a prescribed angle, a sensor starts to actuate to release the interlocking device 39. After this, the lever 14 comes back to the neutral position, allowing the working tool to stop automatically the upward swing movement at a height with a prescribed angle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a work tool angle control device for a front loader.

(Prior art) A front loader, which is used by being attached to the body of a tractor, has a boom that is pivotably supported on the vehicle body so that it can move up and down, and a packet (a working tool) that is pivoted on the tip of the boom so that it can move up and down. ), a boom control valve that controls a boom cylinder to move the boom up and down, and a packet control valve to rotate the packet, and these control valves can be operated independently and simultaneously by a single operating lever. It is operable.

When scooping earth and sand into a packet with this type of front loader, it is convenient to place the dumped packet flat on the ground, since it can immediately move forward and scoop up the earth and sand after it touches the ground.

Therefore, a solenoid valve is used as each control valve, and a control signal is electrically given to the solenoid valve by operating a control lever.
A control device that detects the angle of the packet with respect to the boom and automatically returns the packet control valve to neutral when the packet rotates upward to the angle at which it touches the ground horizontally in the descending state was proposed in Japanese Patent Application No. 60-61658. has been done.

(Problems to be Solved by the Invention) Conventional control devices employ electrical control using electromagnetic valves, and therefore have the drawback of extremely high manufacturing costs.

Also, when rotating the 4-kerato upward, the operating lever had to be held in the upward rotating operating position, so when moving the front loader side while moving the vehicle backwards, However, it had the disadvantage of requiring a high degree of skill to operate.

In view of these conventional problems, the present invention makes it possible to use an inexpensive manual control valve as a control valve, and also allows the control valve to be operated automatically even if the control lever is moved to the upward rotation operation position and then released. The purpose is to make it easier to operate the work tool by rotating it to a predetermined angle and then stopping.

(Means for Solving the Problem) As a means for solving the problem, the present invention provides a boom control valve 15 for controlling a boom cylinder 9 for vertically moving a boom 8 that is pivotably supported on the vehicle body 1 side so as to be vertically movable. , and a work implement control valve 16 for rotating the work implement 11 which is pivotally supported at the tip of the boom 8 so as to be vertically movable, and these control valves 15.
16 can be operated independently and simultaneously by one operating lever 14, the operating lever 14 is provided with an engaging portion 38, and when the operating lever 14 is in the operating tool upward rotation operation position, the engaging portion 38 is engaged and disengaged. An engaging tool 39 that can freely engage is provided on the fixed side, and an operating means is provided on the operating lever 14 for operating the engaging tool 39 from a position where it cannot engage with the engaging portion 38 to a position where it can engage. 50, and a detection means 54 for detecting that the working tool 11 is at a predetermined angle with respect to the boom 8 and releasing the engagement tool 39.

(Function) When the operating means 50 of the operating lever 14 is operated, the engaging tool 3
9 is located at a position where it can engage with the engaging portion 38. Therefore, when the operating lever 14 is next operated to the upward rotation operating position, the engaging portion 38 engages with the engaging tool 39, and the operating lever 1
4 in that position. Further, by operating the operating lever 14 at this time, the work implement control valve 16 is switched, the work implement cylinder 12 is contracted, and the work implement 11 is rotated upward around the pivot axis lO at the tip of the boom 8.

When the working tool 11 rotates to a predetermined angle with respect to the boom 8, the detection means 54 detects this and moves the engagement tool 39 in the releasing direction. Therefore, the operating lever 14 and the work tool control valve 16 return to neutral, and the work tool 11 automatically stops rotating upward at a predetermined angle.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
The figure illustrates a packet-type front loader that is used by being attached to a tractor. In Fig. 4, 1 is a tractor body;
2 is a driver's seat, and 3 is a mounting base, which are provided on both left and right sides of the tractor body 1.

Reference numeral 4 designates a front loader, which includes a column 5 detachably attached to a mounting base 3, a place 6 projecting forward from the column 5 and detachably attached to the front end of the tractor body l, and a place 6 attached to the upper end of the column 5. A boom 8 is pivotably supported by a pivot 7 so as to be movable up and down, a boom cylinder 9 is used to move the boom 8 up and down, and a packet (work tool) is pivoted to the tip of the boom 8 so as to be movable up and down by a pivot 10. 11 and packet 11
A packet cylinder (work tool cylinder) 12 for rotating the machine. Note that a pair of support columns 5, places 6, booms 8, boom cylinders 9, and packet cylinders 12 are provided on the left and right sides.

Reference numeral 13 denotes a control device, which is attached to the right column 5 of the pair of left and right columns 5, and this control bag W13 has one operating lever 14, and as shown in FIGS. 1 to 3. It is composed of

1 to 3, 15 is a boom control valve that controls the boom cylinder 9, 16 is a packet control valve (work implement control valve) that controls the packet cylinder 12, and these control valves 15 and 16 are spool type control valves. Consists of a 3-position switching valve,
Mounting plate 19 so that spool 17.1B is in the vertical direction
is fixed. Note that the mounting plate 19 is fixed to the support column 5. A control box 20 is fixed to a mounting plate 19 above the control valve 15.16.
An interlocking mechanism 21 is provided to enable independent and simultaneous operation of 6. The interlocking mechanism 21 includes a first oscillator 2 that can swing freely around the axes of a first shaft 22 and a second shaft 23 that are perpendicular to each other.
4 and a second rocker 25, and the operating lever 14 is fixed to the second rocker 25. In addition, the operating lever 14
protrudes upward from an opening 27 formed in the top plate portion 26 of the control box 20. The first rocker 24 is U-shaped and has a first shaft 22 extending in the left-right direction, and the first shaft 22 is rotatably inserted into a boss portion 29 fixed to a bracket 28 of the mounting plate 19. has been done. The first rocker 24 has an arm portion 30 that projects forward, and the arm portion 30
is connected to the spool 17 of the boom control valve 15 via a pin 31, a rod 32, and a pin 33. Second oscillator 2
5 is pivotally supported within the first rocker 24 by a second shaft 23 in the front-rear direction, and the second rocker 25 has a protrusion 34 that projects in the opposite direction on the axis of the first shaft 22. has. The protrusion 34 is connected to the spool 18 of the packet control valve 16 via a ball receiver 35, a rod 36, and a pin 37.

Therefore, the operating lever 14 can be swung around each shaft 22, 23 in the front and rear lowering and raising directions, as well as in the left and right scooping (upward rotation) and dumping (downward rotation) directions. By the combined movement of the rockers 24 and 23 around the rockers 24 and 25, it is possible to swing the rockers 24 and 25 in any direction between them.
I6 is independently interlocked, and each control valve 15.
16 are designed to work together at the same time.

Reference numeral 38 denotes an engaging portion, which is provided so as to protrude from the base of the operating lever 14 toward the rake direction with a slight inclination toward the lowering direction. Reference numeral 39 denotes an engagement tool, which is pivoted to an inverted U-shaped bracket 40 attached to the lower surface of the top plate 26 of the control box 20 so as to be movable up and down by a pivot 41, and is connected to a stopper by a helical spring 42. The portion 43 is urged upward so as to come into contact with the top plate portion 26 side. An upward hook-shaped portion 44 is provided at the tip of this engagement tool 39, and as shown in FIG. When the rake is operated by b toward the rake operation position,
The engaging portion 38 is configured to detachably engage with the hook-shaped portion 44 from above.

The movable core 46 of the solenoid 45 is connected to the pin 4 in the engagement tool 39.
7, and the solenoid 45 is connected to the pin 47.
It is connected to the bracket 48 of the control box 20 via. The solenoid 45 is configured so that when it is energized, the movable iron core 46 pulls down the engaging tool 39 to a position where it cannot engage with the engaging portion 38, and when it is demagnetized, it returns to the position where it can be engaged (the solid line position in FIG. 2). ing.

The solenoid 45 is connected to a drive circuit 49 as shown in FIG. 6, and the drive circuit 49 is controlled by signals from a top switch 50 and a detection switch 51 via a flip-flop circuit (control circuit) 52.

The top switch 50 constitutes an operating means, is a push button switch, and is provided on a grip portion 53 at the tip of the operating lever 14. The flip-flop circuit 52 cuts off the output when the top switch 50 is turned on,
An output is output when the detection switch 51 is turned on.

The detection switch 51 constitutes a part of the detection means 54. As shown in FIG.
Pin 5 to bracket 55 of packet 11 above pin 0
A rod 5 is pivoted at 6 and extends along the boom 8.
7, a guide cylinder 58 that slidably holds the free end side of the rod 57, and a cam 59 provided on the rod 57. The detection switch 51 is operated by a cam 59 when the detection switch 51 is rotated. The detection switch 51 is attached to a guide tube 58, and the guide tube 58 is pivoted to the boom 8 with a pin 60.

Next, the operation will be explained. When the operating lever 14 is operated in the dump direction at the highest position of the boom 8, the second rocker 25 swings around the second shaft 23, and the packet control valve 16 is opened via the protrusion 34 and the mouth/throat 36. As the spool 18 is pulled upward, the packet cylinder 12 expands and the packet 11
performs a dumping operation around the axis 10, releasing earth and sand.

In the dumping state of the packet 11, if the operating lever 14 is operated in the scooping direction, the packet 11 is rotated upward around the pivot shaft 10. In this case, in order to bring the packet 11 into a state where the bottom surface can be grounded horizontally, the top switch 50 is pressed, and the output from the flip-flop circuit 52 is cut off, so the solenoid 45 is demagnetized and the engagement tool 39 is connected to the spring 4.
2 to a position where it can be engaged, and the stopper part 4
3 comes into contact with the top plate portion 26 side. Therefore, the operating lever 14
After slightly operating the operating lever 14 in the downward direction from the neutral position N within the play range a, the engaging portion 38 engages with the engaging member 39 from above, and the operating lever 14 lock in the rake operation position. By operating this operating lever 14, the second rocker 25 swings around the second shaft 23 and pushes down the spool 18 of the packet control valve 16 via the rod 36, so that the packet cylinder 12
contracts, and the packet 11 pivots upward about the pivot 10.

On the other hand, the rod 53 is pushed backward by the upward rotation of the bucket) 11 around the axis 10, and the cam 55 is activated by the detection switch 5.
Approach the 1st side. When the packet 11 rotates to an angle that allows the bottom surface to be horizontally grounded, the detection switch 51 is turned on by the cam 55, and an output is output from the flip-flop circuit 52, so the solenoid 45 is energized and engaged via the movable iron core 46. The tool 39 is pulled down around the pivot 41 to release the engagement with the engagement tool 39.

Therefore, the spool 18 of the packet control valve 16 is pushed back upward to the neutral position by its return spring, the bucket eye 1 stops rotating, and the operating lever 14 returns to the neutral position.

Next, by operating the operating lever 14 in the downward direction, the first shaft 2
The first oscillator 24 oscillates around 2 and pushes down the spool 17 of the boom control valve 15 via the arm 30 and the loft 32, so the boom cylinder 9 contracts and the boom 8
descends. During this time, the bucket eye 1 is still in a stopped state, so if the packet 11 is grounded, the bottom surface 11a will always be
will touch the ground horizontally.

Even after the top switch 50 is turned on, when the packet 11 is simply squeezed, the operation lever 14 is pressed.
It is only necessary to operate it directly from the neutral position N in the rake direction, and at this time the engaging portion 38 does not engage with the engaging tool 39.

If the operator is an expert and there is no need to lock the operating lever 14 in the operating position, the top switch 5
If 0 is turned off, the solenoid 45 remains energized, and the engagement tool 39 is held in an unengageable position. Therefore, you can operate according to your skill level.

In the above embodiment, the engaging portion 38 and the engaging member 39 engage within the play range a in the lowering direction, but as shown in FIG.
The engaging portion 38 and the engaging member 39 may be engaged with each other when the boom 8 is in the operated state, and in this way, the packet 11 can be controlled to be horizontally grounded during the lowering operation of the boom 8.

The detection switch 51 detects the packet 11 as shown in FIG.
The cam 61 provided on the bracket 55 may be used for direct operation. In this case, the detection switch 51 is attached to the side surface of the boom 8.

In addition to the packet 11, the working tool may be a fork or the like.

In FIG. 10, the boom control valve 15 and packet control valve 16 are installed on the support column 5 side, the control device 13 is installed on the fender 63 inside the cabin 62, and these are connected to push-pull wires 64, 65, 66, 67. , which are interlocked and connected via a separable connector device 68, and can be separated by the connector device 68 when the front loader 4 is removed.

That is, the sprues 17.18 of each control valve 15.16 are connected to push-pull wires 64.6 as shown in FIG.
The inners 69 and 70 of No. 5 are connected, and the outer receivers 71 and 72 thereof are attached to an outer receiver 73.

Inner 73.74 of push-pull wire 66.67 is connected to each rocker 24.25 of control device 13, and outer 75.76 of push-pull wire 66.67 is attached to outer receiver 77.

The connector device 68 is constructed as shown in FIGS. 11 to 13. 78 is a fixed plate on the cabin 62 side,
Two arms 80 and 81 are supported on this via a support shaft 79 so as to be vertically movable and protrude in opposite directions.

Each arm 80.81 has notches 82, 83 formed at its tip, and a push-pull ear 66.6 at its midway point.
7 inners 73 and 74 are connected.

In addition, the outer 75 of the push-pull wire 66.67
76, the outer receiver provided on the fixed plate 78 below the arm 80.81 is attached to the fixture 84.85.

Reference numeral 86 denotes a U-shaped bracket, which has two m sections 87 and 88 that abut against the side surfaces of the fixing plate 78, and one leg section 87.
A pin hole 90 is formed in which the positioning pin 89 of fixing #1E78 engages. The bracket 86 has a cylindrical shaft part 91 in the center and a mounting bolt 93 with a knob 92. With the cylindrical shaft part 91 externally fitted onto the tip of the support shaft 79, the mounting bolt 93 is placed on the support shaft 79 side. By screwing together, the bracket 86 is removably fixed to the fixing plate 78.

Two lever-shaped levers 94.95 are provided on the cylindrical shaft portion 91 and are movable up and down and protrude in opposite directions, and each of the levers 94, 95 has a notch 82.95 at the tip of the arm 80.81. Protrusions 96 and 97 are provided to removably engage with 83. An inner 69.70 of a push-pull wire 64.65 is connected to the middle part of each lever 94.95, and its outer 71.72 is attached to a fitting 98.99 on the bracket 86 side.

With this configuration, when the mounting bolt 9o is removed and the bracket 86 is removed, the push-pull wire 64.65
and 66 and 67 are separated at the connector device 68, so that the front loader 4 can be easily attached and detached.

When the operating lever 14 is operated in the up/down direction, the push-pull wire 66, arm 80. The spool 17 of the boom control valve 15 moves up and down via the lever 94 and the push-pull wire 64, and when the operating lever 14 is operated in the dump/rake direction, the packet control valve 16 is moved up and down in the same way.
The spool 18 moves up and down.

(Effects of the Invention) According to the present invention, the engaging portion 38 of the operating lever 14 is engaged with the engaging tool 39 at the working tool upward rotation operation position, and the working tool 11 is set at a predetermined angle with respect to the boom 8. Since the engaging tool 39 is released by the detection means 51 when this occurs, the work tool 11 will automatically stop at a predetermined angle even if you release your hand after operating the operating lever 14 to the upward rotation operating position. It is much easier to maneuver than conventional models. Further, since the operating lever 14 is mechanically held by the engaging member 39, an inexpensive manual control valve can be used as the control valve 16, and manufacturing costs can be reduced. Moreover,
Since the engaging tool 39 is operated from the disengageable position to the engageable position by the operating means 50 provided on the operating lever 14, the operating lever 14 can be locked in the operating position depending on the skill level of the operator. This improves work efficiency.

[Brief explanation of the drawing]

1 to 7 show one embodiment of the present invention, in which FIG. 1 is a sectional side view of the control device, FIG. 2 is a sectional rear view of the control device, FIG. 3 is a sectional plan view, and FIG. Figure 4 is the overall side view 1.
Fig. 5 is an explanatory diagram of the operation, Fig. 6 is a control circuit diagram, Fig. 7 is a side view of the detection means, Fig. 8 is an explanatory diagram of the operation showing another embodiment, and Fig. 9 is an alternative diagram of the detection means. A side view showing an example of
FIG. 10 is an overall side view showing another embodiment, FIG. 11 is a configuration diagram of the main parts, FIG. 12 is a cross-sectional plan view of the same connector device, and FIG. 13 is a view taken along the arrow x-xg in FIG. 11. It is a diagram. ■...Tractor body, 4...Front loader, 8...
...Boom, 9...Boom cylinder, 11...Packet (work tool), 12...Packet cylinder (work tool cylinder), 13...Control device, 14...Control lever, 15...・Boom control valve, 16...Packet control valve (work implement control valve), 21...Interlocking mechanism, 38...
Engagement part, 39... Engagement tool, 45... Solenoid, 5
0...Top switch (operation means), 51...Detection switch, 54...Detection means. Procedural amendment document 1, Indication of case 1986 Patent Application No. 200469 2, Name of invention Front loader work tool angle control device 3, Person making amendment Relationship with case Name of patent applicant (105) Kubota Iron Works Co., Ltd. 4, Agent
Person ◎577 Ill Churia 10I3, Higashiosaka City, Osaka Prefecture Telephone: 06 (782) 6917/6918 No. 1983
December 20, 2015 6, Subject of amendment/Brief explanation of drawings in the specification column 7, Contents of amendment

Claims (1)

[Claims] (1) A boom control valve 15 that controls a boom cylinder 9 for vertically moving the boom 8 which is pivotally supported on the vehicle body 1 side so as to be vertically movable, and a boom control valve 15 which is pivotally supported on the tip of the boom 8 so as to be vertically movable. A work tool control valve 16 for rotating the tool 11 is provided, and these control valves 15 and 16 are operated by one operating lever 14.
In the device which can be independently and simultaneously operated, the operating lever 14 is provided with an engaging portion 38, and the engaging member is removably engaged with the engaging portion 38 when the operating lever 14 is in the upward rotation operation position of the work tool. 39 is provided on the fixed side, and the operating lever 14 is provided with an operating means 50 for operating the engaging tool 39 from a position where it cannot be engaged with the engaging portion 38 to a position where it can be engaged, and the working tool 11 is A work implement angle control device for a front loader, characterized in that a detecting means 54 is provided for detecting that a predetermined angle is reached with respect to the boom 8 and releasing the engaging tool 39.