SU1230969A1 - Hydraulic system for throwing off pipe-laying crane counterweight - Google Patents

Description

FIELD OF THE INVENTION The invention relates to hoisting and transport machinery, in particular to hydraulic systems of pipe-laying cranes.

The purpose of the invention is to reduce energy costs and increase reliability.

The drawing shows a hydraulic crane with a hydraulic system for tilting the counterweight of the latter.

The hydraulic system for tilting the counterbalance of the crane-pipelayer contains a hydraulic cylinder 1 for tilting the counterweight, the body of which is fixed to the base machine, and the rod of the hydraulic cylinder 1 for tilting the counterweight is fixed on the boom 2, in the upper part of which the loads are fixed. The boom 2 with the weights secured on it is a folding counterweight to the pipe-laying crane. The boom 2 is pivotally mounted on the base machine. Through the distributor 3, one of the cavities (piston) of the counterweight balancing cylinder 1 is connected with the pump 4 and the tank 5. The piston cavity of the counterbalance balancing cylinder 1 is a lowering cavity. Another cavity (rod) of the hydraulic cylinder 1 of the counterweight tilting is connected to the hydraulic accumulator 6 by means of a hydraulic line 7 made with two parallel hydraulic lines 8 and 9, in which the check valves 10 and 11 and the adjustable chokes 12 and 13 are connected in series The bore of the hydraulic cylinder 1 for swinging the counterweight is a lifting cavity. The pump 4 is communicated with the distributor 3 via the check valve 14, and with the hydraulic accumulator 6 through the line 15, in which the controlled valve 16 and the check valve 17 are connected in series. The hydraulic system also contains a safety valve 18 and a filter 19.

The hydraulic system for tilting the counterbalance of the pipe-laying machine works as follows.

In the neutral position of the spool of the distributor 3, the piston cavity (lowering cavity) of the hydraulic cylinder 1 of the counterweight tilting is closed, and the rod cavity (lifting cavity) is communicated with the hydraulic accumulator 6. The pressure of the hydraulic accumulator of the hydraulic accumulator 6 is set using a controlled valve 16 such that acting on the piston of the hydraulic cylinder 1 to tilt the counterweight from the side of the rod cavity (cavity

Editor I. Casard Order 2316/25

Compiled by O. Kuzmina Tehred I. VeresKorrektor M. Pojo

Circulation 799 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

lift), completely balanced the force on the piston, created by the force of the arrow body with loads, and slightly exceeded it. Such a pressure value in the hydroaccumulator 6 ensures the lifting of the counterweight from the working position to the transport position without a pump. In the initial position, the counterweight is fixed and in the up position.

To tilt the counterweight, the spool of the distributor 3 moves downwards and connects the pump 4 to the piston cavity of the hydraulic cylinder 1 to tilt the counterweight. Under the action of the pressure of the working fluid and the force of the body of the arrow, the weights of the counterweight occur with loads. The working fluid from the rod end flows through the throttle 12 and the check valve 10 into the hydraulic accumulator 6, charging it. Thus, the energy stored by the hydroaccumulator 6 when the counterweight is tilted away is the sum of the energy of the working fluid pressure created by the pump and the potential energy of the weight of the arrow weight with loads, the latter being the dominant one. In addition, the presence of hydroaccumulator 6 and throttles 12 stabilizes the speed of lowering the counterweight and prevents the formation of discharges and ruptures of the working fluid flow in the piston cavity of the hydraulic cylinder 1 of the counterweight tilting, which increases the reliability of the counterweight.

To raise the counterweight, the spool of the distributor 3 moves up and connects the pump 4 and the piston cavity of the counterbalance tilt cylinder 1 to the tank 5. The counterweight rises under the action of the pressure of working fluid coming from the accumulator 6 through the check valve 11 and throttle 13 into the rod end of the hydraulic cylinder 1 of tilting counterweight. The lifting speed is controlled by an adjustable throttle 13. Since the counterweight is lifted by the pressure of the working fluid from the hydraulic accumulator, a fault in the engine or pump is not an obstacle to lifting the counterweight to the transport position. Leakage of the working fluid from the hydraulic accumulator of the torus, possible with long-term just machines, is compensated by the pump through check valves 14 and 17 and the controlled valve 16 during charging of the hydraulic accumulator 6 in the spool position of the distributor 3 corresponding to tilting of the counterweight.

Claims (1)

A HYDRAULIC SYSTEM for tipping the counterweight of the crane-stacker, containing a hydraulic cylinder tipping counterweight, one cavity of which is communicated through a distributor with a pump and a tank, and hydraulic lines, characterized in that, in order to reduce energy consumption and increase reliability, it is equipped with a hydraulic valve valves and throttles, while the accumulator is in communication with the other lane. the tilt of the counterweight tilt cylinder through a hydraulic line, which with two parallel hydraulic lines, in each of which one of the specified check valves and throttle valves are connected in series, the pump being in communication with the distributor via the third check valve, and with the hydraulic accumulator through the line, in which the controlled valve communicated by its control cavity to the hydraulic accumulator q and the fourth check valve. ®