Device of hydraulic cylinder of loader boom

FIELD: construction.

SUBSTANCE: loader boom hydraulic cylinder is proposed, comprising a body, lower and upper covers of the hydraulic cylinder, a braking device and a check valve. At the same time the check valve is made in the form of a cylindrical cap with a spring inside and an inlet nozzle installed in a separate body fixed on the hydraulic cylinder body. Besides, the specified valve communicates with the piston cavity of the hydraulic cylinder by means of an additional hole made in the hydraulic cylinder body.

EFFECT: elimination of piston strikes against a hydraulic cylinder cover as a loader boom is installed in a position of excavating start at the level of the support surface.

1 dwg

 

The invention relates to hydraulic actuators operating equipment shovel loaders, namely, devices protect cylinders from the blows of the piston in the lid.

Known protection device of cylinders front-end loader from dynamic loads when driving on uneven supporting surface [Patent RU No. 2342496, publ. B. I. No. 36. - 2008], which contains the cylinders of the boom, including the body of the cylinder, the lower and upper cover, a piston rod, a pneumatic dampers mounted in the piston cavity of the hydraulic cylinders boom, check valves.

The disadvantage of this device is the inability to prevent strokes of the piston on the cover of the cylinder during lowering work equipment in the original lower position for use of the material.

Known protection device of cylinders shovel front loader [Pleskov DI, Skokan A.I. Construction trucks. - M.: Higher school, 1974, s-202], which contains the body of the cylinder, the bottom and top cover of the cylinder, the piston and rod, in which one side of the piston cylinder has a shank on the piston and on the other sleeve top damper provides damping of the movement of the piston of the hydraulic cylinder in the lower and upper positions of the boom.

A disadvantage of this device when working one is ofsewage front loader is the presence of a peak overloading of the hydraulic pump in the beginning of the lifting boom with a load in the bucket. When the flow of fluid from the hydraulic pump to the hydraulic cylinder piston chamber is closed by a shank on the piston so that the working fluid from the pump enters the piston cavity only through the annular gap formed by the shank and the hole in the bottom cap of the cylinder. As a result, increases the pressure in the hydraulic pump, which causes harsh pump overload, increased wear and reduced life of the pump and cylinder.

Closest to the proposed device is the device [Machine hydraulic actuators: a Handbook. - 2nd ed., M: mechanical engineering, 1988, P.52], which contains the body of the cylinder, the lower and upper cylinder cover, piston rod, which piston cylinder on the one hand there is the shank of the lower damper, on the other hand - sleeve top damper, ball check hydraulic valve with spring in the supply lines located in the bottom cap of the cylinder.

The disadvantage of this device is imperfect design ball check hydraulic valve with spring, lies in the complexity of the design of the lower cover. The disadvantage of this device is the necessity of using additional intermediate parts, ensuring the Assembly of the spring with the ball.

The objective of the invention is to improve the instrukcii device, providing an exception strokes of the piston in the cap of the cylinder when installing the boom in the position of the beginning stock level supporting surface.

The task of the invention is solved due to the fact that in the known device, comprising a housing cylinder, the bottom and top cover of the cylinder, a check valve according to the invention a check valve is made in the form of a cylindrical cap with a spring inside and inlet, which is installed in a separate housing attached to the housing of the hydraulic cylinder, in which you have an extra hole connecting the piston cylinder chamber to the housing of the valve.

The proposed device provides increased functionality of the cylinder by braking in the lower and upper positions of the boom shovel front loader, while ensuring the normal operation of the hydraulic pump at the start of lifting.

The invention is illustrated in the drawing, which shows the structure of the proposed device.

The drawing shows: 1 - the case of the hydraulic cylinder; 2, 3 - upper and lower caps of the cylinder; 4 - piston; 5 - rod; 6, 7 - upper and lower lugs; 8 - shank; 9 - sleeve damper; 10 - fitting piston cavity; 11 - fitting the rod end; 12 - piston cavity; 13 - hole in the housing hydration the RA; 14 - return valve; 15 - spring; 16 - the body of the valve.

In the proposed device is a cylindrical check valve is made with a mechanical separator cavities and a spring housed in a separate housing attached to the outer surface of the housing cylinder.

The protection device cylinders shovel front loader works as follows. When lowering the boom in the lower limit position, the shank 8 of the piston is coming to an output of the Central hole in the lid 2 is locked to a certain amount of fluid that may come out of the piston cavity through the annular channel formed by the shank and the hole in the bottom cap of the cylinder. As a result of increased pressure in the piston cavity, which provides braking boom single bucket front-end loader, excludes the impact of the piston on the bottom plate of the cylinder.

When lifting boom with a load in the bucket from the bottom of the provisions of the working fluid is supplied to the nozzle 10. Due to the fact that the piston chamber is blocked by the shank 8, the working fluid through the Central hole may not enroll in the piston cylinder chamber, opens the check valve, through the hole 13 connects the pump with the piston cavity through the rise of the arrows. The proposed invention and which engages the hammer in the pump at the moment of lifting the boom, increases the service life of hydraulic pump, hydraulic cylinder and hydraulic system as a whole.

The device of the hydraulic cylinder the boom, including the body of the cylinder, the bottom and top lid hydraulic cylinder, hydraulic brake device, characterized in that it contains a check valve in the brake device, made in the form of a cylindrical cap with a spring inside and inlet executed in a separate housing attached to the housing of the hydraulic cylinder, in which you have an extra hole connecting the piston cylinder chamber to the housing of the valve.



 

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