JPH0523637Y2 - - 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. This invention relates to a hydraulic circuit for a shear loader used to load shear (referred to as "sheaf") onto a transport vehicle such as a truck.

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. 2, a conveyor is installed on the slide-shaped main body 1, and the scraps are scraped into one end of the conveyor by a bucket 3 or a scraping arm, placed on the conveyor, and then waited at the other end of the conveyor. A type of shear stacking machine that transports items onto a transport vehicle has been developed. 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, so compared to the conventional method where the shear is scooped up and loaded onto a transport vehicle. It has been widely used in this field in recent years because it has the advantage of being able to carry out shear stacking work continuously and efficiently.

Problems to be Solved by the Invention As mentioned above, the above-mentioned shear loading machine is designed to carry the scraps scraped in by the bucket cart or scraping arm onto a conveyor, and the bucket cart or scraping arm is operated. A cylinder is provided to operate the conveyor, and a motor is provided to operate the conveyor, and these cylinders and motors are generally operated individually manually using operation levers or push buttons, but scraping by a bucket or scraping arm is not possible. In contrast, once the conveyor drive motor is switched to the drive side, it continues to drive and usually does not finish the raking operation. It will not be stopped even if it is temporarily interrupted.

This invention aims to save energy by automatically stopping the conveyor drive motor in conjunction with stopping scraping.

Means for Solving the Problems The present invention therefore provides a hydraulic circuit for a shedding machine in which a cylinder for operating a bucket or scraping arm is provided in the discharge pipe of the pump via a manually operated switching valve. A pilot operated switching valve is provided to control the movement of the conveyor drive motor, and both the cylinder and the motor are activated or stopped by switching the manually operated switching valve.

Here, the cylinder is a cylinder for carrying out the raking operation of the bucket or raking arm.
Directly connected to bucket or scraping arm,
It consists of a cylinder that operates these, a cylinder that is connected to a boom to which these are connected, and a cylinder that operates the boom.

The motor is a hydraulic motor or an electric motor. When an electric motor is used, for example, a solenoid valve for controlling the drive of the electric motor is linked with a pilot operation switching valve.

Embodiment A boom 5, which is pivoted to a bracket 4 and bends and extends at its intermediate portion, is raised and lowered by a jib lift cylinder 6, and is swung in the left-right direction in FIG. 2 by a taper arm cylinder 7.
The bucket belt 3 pivoted at the tip is rotated left and right by the bucket cylinder 8, and the bucket belt 3 is normally caused to perform a raking operation by the taper arm cylinder 7 and the bucket cylinder 8. There is. Although not shown in FIG. 2, a hydraulic motor for driving the conveyor is provided at the right end of the main body 1.

FIG. 1 shows the hydraulic circuit of each cylinder and the hydraulic motor, in which the pump 11 discharge pipe 12 connects to the tapered arm cylinder 7 via a manually operated switching valve 13, and via another manually operated switching valve 14. The cylinders 7 and 8 are connected to bucket cylinders 8, respectively, and the direction of movement of each cylinder 7 or 8 is changed or stopped by switching operation of a switching valve 13 or 14. A manually operated switching valve 16 in which the discharge pipe 12 or its branch pipe 15 is arranged in parallel.
It is connected to a hydraulic motor 18 via a pilot operation switching valve 17, and the pilot operation switching valve 17 operates either the manual operation switching valve 13 or 14 to operate either the taper arm cylinder 7 or the bucket cylinder 8. When the switch is turned on, the switch is made so that pressure oil is sent to the hydraulic motor 18. In the figure, 19 is a shuttle valve.

This device is constructed as described above, and at the same time when the switching valve 13 is switched and discharge pressure enters the bucket cylinder 8, the pilot operation switching valve 17 is switched.
When the switching valve 13, which rotationally drives the hydraulic motor 18, is switched to the intermediate position, the oil supply to the bucket cylinder 8 is stopped, and the pilot pressure decreases accordingly, the switching valve 17 is switched, and the hydraulic motor 18 is switched. stops. The same applies when switching the switching valve 14.

As described above, the hydraulic motor 18 is driven or stopped by switching the pilot operation switching valve 17 automatically by switching the switching valve 13 or 14, but it can also be driven or stopped by switching the manual operation switching valve 16. It can be driven, stopped, or reversed.

Effects of the invention In the shear loading machine according to the present invention, the conveyor is driven when the bucket cart or scraping arm is moved and scraping is performed, and the conveyor is also stopped when the bucket cart or scraping arm stops moving. Since the conveyor is driven only when necessary, it is possible to save energy.

[Brief explanation of the drawing]

Figure 1 is a hydraulic circuit diagram of the shear stacking machine according to this proposal.
FIG. 2 is a front view of the shear stacker. 3...Bucket, 5...Boom, 7...Tasteper arm cylinder, 8...Bucket cylinder, 11...Pump, 13, 14, 16...Manual operation switching valve, 17...Pilot operation switching valve, 1
8...Hydraulic motor.

Claims (1)

[Scope of utility model registration request] In a hydraulic circuit in a stacking machine in which a cylinder for operating a bucket or scraping arm is provided in the discharge pipe of the pump via a manually operated switching valve, the movement of the conveyor drive motor is controlled by the manually operated switching valve. A hydraulic circuit is provided with a pilot-operated switching valve to control the cylinder and the motor, and the cylinder and the motor are both operated or stopped by switching the manually operated switching valve.