JPS6160931A - Bucket operating structure for shovel working vehicle - Google Patents

Abstract

PURPOSE:To enable slow stop and quick stop to be effected individually and separately from each other, by providing a control means which changes over a control device, adapted to decrease a working speed in the vicinity of the stroke end of a cylinder for bucket slewing, to an operative condition and a non-operative condition. CONSTITUTION:A bucket 2 is pivotally secured to the forward end of an arm 1 so that it can be freely rocked around an axis P, and the bucket 2 is rocked through a link 3 with the aid of a cylinder 4. A sensor 7, which detects an expansion or contraction amount of the cylinder 4 from a rocking angle of the bucket 2 with the arm 1, is mounted to the axis P. When the cylinder 4 is expanded to the vicinity of a stroke end on the soil discharge side, a control device is actuated on an electromagnetic proportional valve 8 to decrease the working speed of the cylinder 4 to bring the bucket 2 into a slow stop. Meanwhile, a control means 9 is changed over to bring the control means 8 into a non-operative state. As a result, the cylinder 4 is forced into a quick stop at the stroke end, and earth in the bucket is dropped due to an impact produced by said quick stop.

Description

[Detailed Description of the Invention] [Industrial Field of Application] Zero-Hatsuo is interested in a simple two-way packet operation structure for excavators equipped with a control electromagnetic valve for a packet cylinder.

[Conventional technology]

In general, the packet frame is swingably attached to the tip of an arm, etc., and the swing operation end of the packet in the tamp direction is generally aligned with the stroke end of the cylinder.

Further, conventionally, the =JIJ structure of the cylinder can be roughly divided into the following configurations. Measure 10 or when releasing earth and sand,
The oil passage VC for the cylinder is not interposed with any equipment so that the cylinder operates at a constant speed until the cylinder reaches the stroke end, and the a formation of %2 is such that the cylinder operates at a constant speed before the cylinder reaches the stroke end when discharging earth and sand. In order to gradually reduce the operating speed, an iT variable throttle valve or the like is installed in the oil path for the cylinder, and the variable throttle valve or the like is placed close to the operating end on the dang side of the packet t11rIIJ. It works well in conjunction with sensors.

[Problems that the invention attempts to solve]

1] With the rJe first configuration, when the packet is operated at a constant speed to the operating end on the gungu side, when the cylinder reaches the stroke end, the operation of 1c suddenly stops, generating an impact, and the packet and... Packet is large 9<III
IJ shake. Therefore, is the sediment water? Even if it is soft and contains a large amount of dirt, it is possible to release dirt and sand without getting stuck in the packet due to the vibration of the packet, but on the other hand, this vibration or impact is transmitted to the car body through the arms etc., which is unpleasant. .

In addition, in the second configuration, the cylinder can have a cushioning effect, so the above-mentioned discomfort is eliminated, but if the soil is soft and contains a lot of water, There is a problem that dirt tends to remain on the inner surface of the packet after discharge, and the cost is particularly high due to the installation of a variable throttle valve, etc.), so there is still room for improvement.

The present invention has been made in view of the above-mentioned problem, and is unique in that the above-mentioned problems can be solved by rational modification.
) The purpose is to provide Em structure.

[Comparison means for solving the problem] What is the difference between the present invention and the solution? Based on the detection information of the sensor that detects the middle position of the cylinder, the electromagnetic proportional valve fQ is set to the closing side in terms of MIJ in order to reduce the cylinder operating speed near the stroke end as the total stroke end approaches. Control means to produce m? In addition to providing the control means tfF, there are nine operating means for switching between the infant state and the non-operating state, and the functions and effects of the seventh point are as follows.

[For production]

As described above, the f'PIFl speed of the cylinder is adjusted by the electromagnetic proportional valve based on the detection result of the sensor. Even if the packet driving speed is relatively high, it is possible to provide a cushioning effect at the end of the stroke of the cylinder, and moreover, IIJ# means tf1! By providing an operating means to switch between active and non-active states, the cylinder has a cushioning effect, which makes it difficult for seedlings to grow inside the packet by shaking the cylinder. You can use it with just one touch.

〔Effect of the invention〕

Therefore, the conventional electromagnetic proportional valve is
With a relatively simple i-configuration that is linked to the WAVC, it is possible to release a small amount of dirt and sand from inside the packet regardless of the shape of the WAVC, improving workability and providing a packet operation structure that is low in cost and easy to handle. One seven.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

At the tip of FIG. 1 (as shown, the arm 11 whose base end is connected to the traveling vehicle body (not shown)), a packet (2) is swingably supported around a 4'tb center (P). , this packet (2
) is connected to the packet cylinder (4) through the link (3) so that it can be oscillated, and the excavator is used to excavate! There are 12 positions.

The relationship between liQ bakut (2) and cylinder (4) is the rotation #J Am on the discharge side of packet (2) and cylinder (4).
The cylinder (4) is formed so that the stroke end on the contraction side substantially coincides with the cylinder (4), and a multi-layer type cylinder (4) is used. Also, 1 for 73 valves for cylinder (4)! A magnetic proportional valve +lit is used, and the amount of oil supplied to the cylinder (4) can be adjusted by lx4 by the amount of operation of the nine-operation lever (5) by delaying the operation of this valve (51).

The electromagnetic proportional valve TII is configured such that the oil passage in the valve can be turned Mfi in order to control the flow of f1' auxiliary oil according to the amount of operation 1c from the outside, such as a lever. Because it uses electromagnetic force, it is called an electromagnetic proportional valve.

In this excavation equipment, the cylinder (4) is moved to the end of the stroke on the discharge side in order to prevent the soil shoveled by the Pakutsu F12 from containing a large amount of moisture and becoming stuck in the packet even after the soil is discharged. Operate at a constant speed with l and press the cylinder (
4) suddenly stops at the end of its stroke and the oscillation of the packet (2) causes the soil in the packet to fall, and the cylinder (4) ) is able to self-help reduce its operating speed near the stroke end, and can be used selectively with cylinder f4), which has a cushioning effect.

According to Theory 1, the cylinder (4) is extended &
A sensor (7) for detecting ll: is provided, and the C sensor (7) and a control device (8) with a built-in micro convenience sensor are linked, and this 1l JOQI device (8) and the book The proportional control valve (5) is linked to constitute a sub-side means.

As shown in Figure 2, the 1i1J Goso @ (8) has a cylinder (4) with a high NM absorption degree as shown in the figure (Hl), but also a low value as shown in (L) in the same figure. Even if the value is 1, f'li of cylinder (4) along the straight line indicated by Al (in the same figure)
The acceleration speed decreases and eventually reaches the stroke end (E)
And that f1! The valve (5) is configured to completely stop the operation.
A program has been set up to operate the button in the closing direction.

In addition, in Figure 2, the vertical axis shows the operating speed of the cylinder (4) (unit: country/s), and the horizontal axis shows the amount of contraction of the cylinder (4) (unit: 0).
Determine X) and draw the nine graphs.

In addition, the control device (8) includes an operating means indicated by (9) in the figure 1,
In other words, the If and IJ control means can be switched between an activated state and a non-activated state using a switch.

[Bessio side]

On Kimio's side, the program was set to make the cylinder (4)'s yjc speed tl-along the -C line, but the program was set to decelerate the cylinder (4) to follow the non-standard graph. In addition, although the control unit (8) was constructed using a microcomputer, the control unit (8) may be constructed using a node circuit instead. .

Also, the contraction amount of cylinder (4) is set to the release direction of packet +21, and the expansion side is set to the graph side of (2), and Senbu Oni 7)). It is no problem even if it is carried out with linear pear l-81/-1 and cylinder (4) with 1-section contact.

[Brief explanation of drawings]

Drawing t shows Embodiment 1 of a packet operation structure for an excavator working vehicle according to the present invention. Test speed of packet cylinder I2! It is a graph showing I. (4)...Packet cylinder, (61...
...Electromagnetic proportionality. Valve, +71...cm-0 Agent Patent attorney Kitamura 6 Figure 1 Figure i2

Claims (1)

[Claims] Control electromagnetic proportional valve (
5), the cylinder operating speed near the stroke end is adjusted as the stroke end approaches, based on the detection information of the sensor (7) that detects the expansion/contraction position of the cylinder (4). A packet in an excavator work vehicle, which is provided with a control means for automatically operating the electromagnetic proportional valve (5) to the closing side so as to lower the temperature, and an operation means for switching the control means between an operating state and a non-operating state. Operation structure.