SU787341A1 - Hydraulic drive of working member of telescopic boom of load-handling machine - Google Patents

Description

The invention relates to hoisting machinery, and in particular to a hydraulic drive of the working body at the end of the movable section of the telescopic boom.

The hydraulic drive of the working body of the telescopic boom of a lifting machine is known, which contains a pump, a hydraulic distributor of the working body, a hydraulic accumulator and pipelines. A known drive of the working body at the end of the telescopic boom is carried out from a pump installation located on a turntable using a package of flexible hoses and a double pulley block.

This device for supplying working fluid to the working body is unreliable in operation, since flexible hoses experience significant bending and tensile forces, which leads to their rapid failure. In addition, the specified device has large dimensions.

The purpose of the invention is to increase the durability and compactness of the device.

To achieve the goal, the pipelines are made rigid and connected with sections of the telescopic boom, and the valve is equipped with an additional spool, interlocked with the spool of the 5 boom extension control and connected with rigid pipelines and with a hydraulic accumulator, while the return valve is installed between the working body hydraulic motor and rigid pipelines controlled valve. Yu. In FIG. 1 shows a device, a longitudinal section ’, in FIG. 2 is a schematic hydraulic diagram of the device.

The root section 1 is pivotally mounted on the base 2 and has guides for the movable section 3, at the end of which a working body is fixed (not shown in the diagram). A hydraulic cylinder 4 and outer sections of the telescopic pipelines are placed inside the movable section 5. The inner sections of the telescopic pipelines are attached at one end to the root section of the boom, and the other are inserted into the outer pipelines, which are equipped with sealing devices to prevent leakage of the working fluid.

Between the hydraulic motor 30 6 (Fig. 2) of the working body and the pipe3

A check valve 7 is connected by wires.

The internal sections of the pipelines are connected to the hydraulic accumulator 8 through an additional spool 9 mounted in the valve 10. The valve 9 is interlocked with the valve .11 for controlling the movement of the movable boom section, and the valve 9 in the neutral position disconnects the cavities of the telescopic pipelines and the hydraulic accumulator 8. The hydraulic accumulator 8 is equipped with a safety valve 12 , and its charging is carried out by a crane 13. The engine 6 of the working body is controlled using a slide valve 14. Power is supplied to the hydraulic unit in is carried out from the pumping unit 15.

The hydraulic drive of the working body of the telescopic boom is as follows.

When you turn on the additional spool 9 and the spool 11 interlocked with it, the working fluid from the pump unit 15 is fed into the hydraulic cylinder 4, the movable section 3 moves. At the same time, the cavity of the telescopic pipelines 5 through the additional spool 9. communicates with the hydraulic accumulator 8 and the working fluid is either displaced from the pipelines 5 into the accumulator 8, or vice versa, fills the pipelines 5 from the accumulator. The check valve 7 prevents the spontaneous movement of the working body when you turn on the additional valve 9. 35

When the spool 14 is turned on, the working fluid using telescopic pipelines 5 is fed directly through the check valve 7 directly to the working body engine 6, q The working body moves ³ when the spool 9 is in neutral position.

Claims (1)

the wires are connected to a return controlled valve 7. The internal sections of the pipelines are connected to the hydraulic accumulator 8 via an additional spool 9 mounted in the hydraulic distributor 10. The spool 9 interlocks with the spool .11 of the movement control of the moving boom section, and the spool 9 in neutral position separates the cavities of the telescopic pipelines and a hydroaccumulator 8. The hydroaccumulator 8 is equipped with a safety valve 12, and its charging is performed by a crane 13. The engine ITS via valve 14. Power yseh hydraulic units is carried out from the pumping unit 15. The hydraulic drive operating element operates the boom telescopic vledukndim manner. When the additional spool 9 and the spool 11 interlocked with it are turned on, the working fluid from the pumping unit 15 is supplied to the hydraulic cylinder 4 / the displacement takes place under the fluid section 3. At the same time, the cavity of the telescopic pipelines 5 through the additional spool 9, communicates with the hydroaccumulator 8 and the working fluid is displaced from pipelines 5 to hydraulic accumulator 8 or, on the contrary, it fills pipelines 5 from hydraulic accumulator. The return controlled valve 7 prevents spontaneous movement of the actuator when the additional spool 9 is turned on. When the spool 14 is turned on, the working fluid through telescopic pipes 5 is fed through the reverse controlled valve 7 directly to the actuator motor 6. The working body moves at the neutral position of the spool 9. Invention Hydraulic drive of the working body of a telescopic boom of a lifting machine, comprising a pump, a hydraulic control valve with a boom for controlling the boom extension, a hydraulic motor of the working body, a hydraulic accumulator and pipelines due to the fact that, in order to ensure durability and compactness, the pipelines are rigid and connected with telescopic boom sections, and the control valve is equipped with additional a spool interlocked with the boom extension control spool and communicated with rigid 1I pipelines and with a hydraulic accumulator, while a return controlled valve is installed between the hydraulic motors of the working body and rigid pipelines. Sources of information taken into account in the examination 1. Berkman I.L. One-bucket excavators and self-propelled cranes with hydraulic drive. M., 1971, p. 45 (prototype). H : 1 11G Lll (pv / .Z