JPH0545641Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial field of application This invention is used for the construction of tunnels, roads, residential land development, foundation work for buildings, and various other civil engineering construction sites or construction sites, etc., such as rocks, soil, rubble, etc. With regard to shear loading machines used to load shear (referred to as "shear") onto transport vehicles such as trucks,
In particular, it relates to a hydraulic circuit for operating a bucket or scraping arm in the shearing machine.

Prior Art Usually, a loader such as a tractor shovel or a shovel loader is used to load shear onto a transport vehicle such as a truck, but a shovel type excavator may also be used. In any case, conventional shear loading work is carried out by scooping up the shear with a bucket, rotating it to the loading point, and releasing the shear there. On the other hand, in recent years, as shown in Fig. 1, a conveyor is provided on a slide-shaped main body 1 that is tiltably attached to a traveling vehicle 2, and the shear is scraped into the end of the conveyor by a bucket 3 or a scraping arm. A type of shear stacking machine has been developed that transports the materials onto a transport vehicle such as a truck waiting under the other end of the conveyor. According to this shear loading machine, while moving the main body 1 forward, the shear is collected by the bucket 3 or the scraping arm and placed on the conveyor.
In recent years, this method has been widely used in this field because it has the advantage of being able to carry out shear loading work continuously and efficiently compared to the conventional method of scooping up shedding and loading it onto a transport vehicle.

Problems to be Solved by the Invention As mentioned above, the above-mentioned shear loading machine is designed to transfer the scrap scraped by the bucket cart or scraping arm onto a conveyor, To perform the operation, operate the two operating levers, the operating lever for the date par arm cylinder 5 and the operating lever for the jib lift cylinder 6, to move the bucket, etc. in the direction of the arrow shown by the solid line in Figure 1. However, it is complicated and difficult to operate the two operating levers so that the bucket, etc. draws a solid line trajectory, and it tends to deviate from the solid line trajectory. It dug into the ground and stopped moving, causing the raking work to be interrupted.

This idea was made with the aim of solving the above problem, and after adjusting the bucket etc. to draw an ideal trajectory using a flow rate adjustment valve,
By operating a single lever, a bucket bag or the like can easily and simply draw an ideal trajectory.

Means for Solving the Problems Therefore, in the present invention, the working fluid from the pump is branched after passing through a switching valve, and is sent in appropriate amounts to the date par arm cylinder and the jib lift cylinder, respectively.

In other words, the present invention has a jib lift cylinder that raises the boom and a day par arm cylinder that bends and extends the boom, and the operation of both cylinders causes the bucket or scraping arm attached to the tip of the boom to perform a scraping operation. In a shear loading machine that loads the shear scraped onto one end of the inclined conveyor onto a transport vehicle waiting under the other end of the conveyor, the pipe line connected to the discharge side of the pump is branched off via a manually operated switching valve. Each branch pipe is connected to a jib lift cylinder and a date par arm cylinder, respectively, and each branch pipe is provided with a flow rate regulating valve.

The working fluid used here is compressed air or hydraulic oil.

Embodiment The boom 4, which is pivoted to the bracket 7 and can be bent at the middle part, is connected to the date par arm cylinder 6.
The jib lift cylinder 5 bends and extends the jib lift cylinder 5, and a bucket 3 is attached to its tip.

Figure 2 shows the hydraulic circuit of the date par arm cylinder 5 and jib lift cylinder 6.
The discharge pipe 12 of the pump 11 is a manually operated switching valve 13
The branch pipe 14 is connected to the date par arm cylinder 5, and the other branch pipe 15 is connected to the date par arm cylinder 5.
is connected to the jib lift cylinder 6, and each branch pipe 14 and 15 is provided with a flow rate adjustment valve 16 with a variable check valve, so that the setting can be made so that an appropriate amount of hydraulic oil is sent to each cylinder. ing.

This device is constructed as described above, and when the manually operated switching valve 13 is switched and hydraulic oil flows into the date par arm cylinder 5 and the jib lift cylinder 6 through the flow rate adjustment valve 16, the boom 4 rises and the intermediate section More refracted, Bucket 3
performs a scraping operation to scrape the scraps 8 onto the edge of the conveyor. At this time, the locus of movement of the bucket 3 is drawn as shown by the solid line in FIG. 1 by adjusting the flow rate of the hydraulic oil sent to each cylinder to an appropriate amount by the flow rate regulating valve 16. Bucket 3
When it reaches near the end of the conveyor and the shear scraping operation is completed, switching is performed to the switching valve 13. As a result, the boom 4 is raised and expanded at the same time, causing the bucket 3 to move back. The trajectory of the bucket at this time may be in the opposite direction to the arrow, unless it is in the direction of digging into the ground, or may be an upward trajectory to the left of the figure.

Effects of the invention According to the invention, after adjusting the flow rate of hydraulic oil sent to each cylinder so that the bucket or scraping arm draws an ideal trajectory using the flow rate adjustment valve, one switching valve is switched. With an extremely simple operation, the bucket or raking arm can draw an ideal trajectory and perform raking operations, making shedding work much easier than with conventional methods. become.

[Brief explanation of the drawing]

FIG. 1 is a front view of the shear stacking machine, and FIG. 2 is a hydraulic circuit diagram of the same shear stacking machine. 3... Bucket, 4... Boom, 5... Date par arm cylinder, 6... Jib lift cylinder, 8... Shear, 13... Manual operation switching valve, 1
6...Flow rate adjustment valve.

Claims (1)

[Scope of utility model registration request] A jib lift cylinder that raises and lowers the boom;
A rubble loader having a jib lift cylinder and a dipstick arm cylinder for bending and extending the boom, and having a bucket or shoveling arm attached to the tip of the boom perform a shoveling operation by the operation of both cylinders, thereby loading the rubble shoveled into one end of a tilting conveyor onto a transport vehicle waiting below the other end of the conveyor, characterized in that a pipeline connected to the discharge side of the pump is branched through a manually operated switching valve, and each branch pipe is connected to a jib lift cylinder and a dipstick arm cylinder, respectively, and a flow control valve is provided on each branch pipe.