SU1216300A1 - Hydraulic drive of scraper bucket lip - Google Patents

Description

The invention relates to earthmoving machinery, namely to hydraulic actuators of the scraper,

The purpose of the inventions is the reliability of the scraper in operation.

The drawing shows a hydraulic drive valve scraper bucket.

Ski valve 2 and hydraulic converter 3 are hinged on gate 1. The cavity of hydraulic converter 3 is connected via an adjustable choke 4 to the control chamber of an additional two-way distributor 5, which is installed in a hydraulic main, connecting the main four-way distributor 6 and piston cavities of the power hydraulic jacks. lindrov 7.

The proposed drive works in the following way.

In the initial position, the spool of the main distributor 6 is in the neutral position at which the pump communicates with the tank and the other channels are closed. Therefore, the scraper flap 1 remains fixed.

Before starting to dig the soil, the spool of the main distributor 6 is set to the uppermost position, which corresponds to the automatic control mode of the scraper bucket gate. The valve 1 is raised up and the vertical reaction of the soil to ski 2 is absent, the pressure in the hydraulic converter 3 and the control chamber of the distributor 5 is zero. At that, the valve of the distributor 5 is in the lower position under the action of the spring and informs the pressure line from the main distributor 6 with piston the cavities of the power cylinders 7, and the rod cavities are connected to the pressure line through the distributor 6. As a result, the different areas of the power cylinders 7 move to the left and smoothly lower the valve 1, lowering the ski 2 in contact with the ground and the vertical ground reaction affects lgau and transmitted to the source Hydrodistributor 3 povshaets As a result the fluid pressure in the hydrostatic machine 3 and the control chamber of the distributor 5, the working fluid pressure increases in proportion to the value on the vertical ground reaction ski If

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thirty

35

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Led: the pressure rank exceeds the set limit, then the valve of the distributor 5, overcoming the spring force, moves to the upper position and communicates the piston cavities of the power hydraulic cylinders 7 through the valve 6 with the tank, and the rod cavities through the valve 6 are connected to the pressure line. Under the action of hydraulic cylinders, the damper begins to rise and the vertical reaction of the soil to the ski and the corresponding pressure of the working fluid in the hydraulic converter and the control chamber of the distributor 5 are reduced. As the pressure decreases, the valve returns the spool of the distributor 5 to the lower position, and the cycle is repeated.

As the bucket penetrates, the flap rises along with the bucket, causing the iTpyHTa vertical reaction to the ski and the pressure in the control hydrochip to decrease. The spool of the distributor 5 under the action of the spring is in the lower position, ensuring the lowering of the valve. Therefore, in the case of continuous bucket digging, the flap is continuously covered, preventing the soil from spilling out of the bucket.

To adjust the limits of the vertical reaction of the soil to the ski, depending on the soil being developed, an additional valve 5 mvieeT adjustment screw acting on the spring, the compression force of which determines the amount of pressure at which the distributor switches. The sensitivity of the hydraulic damper actuator is adjusted using adjustable throttles 4, which, in addition to Toro.j, prevents the additional distributor from switching in case of occasional short-term effects of the soil on the ski.

When manually controlling the valve, for example, unloading the soil from the bucket, the spool of the distributor 6 is set to the lowest position, which corresponds to the lifting of the valve. The rod cavities of the hydraulic cylinders 7 in this case are connected through the distribution: the engine 6 with the pressure line, and the piston cavities through the additional and main distributors - with tank.

3

In order to lower the flap when manually operating, the valve of the main distributor 6 is set to the neutral position. As a result, the piston cavities of the hydraulic cylinders are connected through the main and auxiliary distributors with the core line, and the rod cavities

through the main distributor - with a tank.

The transition from automatic control of the damper to manual and reverse is done by switching the main distributor and can be carried out at any time.

Editor A.Shishkin

Compiled by S.Fomin Techred M. Gergel

968/34

Circulation 642Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Proofreader M. Demchik

Claims (1)

HYDRAULIC SCRAPER DUCK DRIVE, including a power hydraulic cylinder, a pump connected through a distributor to a power hydraulic cylinder, a hydraulic converter, the rod of which is connected to a ski pivotally connected to the valve, and a hydraulic main, characterized in that it is equipped with a scraper in order to increase the reliability of the scraper additional, with a spring-loaded spool, a two-position hydraulically controlled distributor / installed in the hydraulic line connecting the piston cavity of the power hydraulic cylinder to the main distribution an actuator, and the control chamber of the additional distributor is connected via an adjustable throttle to the working cavity of the hydraulic converter, while the main distributor is made four-position, in the automatic mode position of which the pump is constantly in communication with the rod cavity of the hydraulic cylinder, and the piston cavity is in communication with the pump or drain. SU „„ 1216300>