RU1827447C - Hydraulic system of load machine - Google Patents

Abstract

The invention is used in the hydraulic systems of road machines, in particular in the hydraulic systems of snow compaction machines. SUMMARY OF THE INVENTION: a hydraulic system comprises a hydraulic system of a main working equipment that is connected through a pressure line to a hydraulic system of auxiliary equipment. The hydraulic system makes it possible to realize, by means of a hydraulic cylinder installed in the hydraulic system of auxiliary equipment, three operating modes of the working body - the drum - positioning, floating position with load, floating position without load. The proposed technical solution provides more reliable operation of the system, its simplification while expanding its functionality - the presence of a floating position of the working body without load, which does not require (ho compared with the prototype) additional adjustment work. 1 ill.

Description

The invention relates to hydraulic systems of road machines and can be used in hydraulic systems of snow compaction machines.

The purpose of the invention is to increase operational reliability while expanding the functionality of the system.

The drawing shows a diagram of the hydraulic system of a road car.

 The hydraulic system of the road machine includes a hydraulic system of the main working equipment, the pressure line 1 of which is connected to the inlet of the pressure reducing valve 2, the output of which through the check valve 3 is connected to the hydraulic system of the auxiliary equipment,

comprising a pump 4, a three-position valve 5, an actuating cylinder 6 with cavities 7, 8 lowering and lifting, a two-position valve 9 made of a three-line, pressure valve 10, an unloading and safety device 11, for example, an unloading and safety valve with remote control, drain 12. The distributor 5 is provided with control elements 13, 14 (electromagnets), and the distributor 9 is provided with a control element 15 (electromagnet).

The cavities 7, 8 of the hydraulic cylinder 6 are connected by lines 16.17 of communication with the distributor 5, and in the line 17 there is a distributor 9, which is connected by its third line with a hydraulic line 18 to the output of the return

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valve 3 and the inlet of the pressure valve 10, the outlet of which is connected to the drain 12.

The hydraulic system operates as follows. The operating position of the hydraulic cylinder 6 is established by turning the distributor 5 into an appropriate position. In this case, the distributor 9 provides a connection of the cavity 7 of the hydraulic cylinder 6 with the distributor 5 (the electromagnet 15 is de-energized), the device 11 operates in a safety mode, and the hydraulic system 1 is disconnected from the hydraulic line 17 by the distributor 9.

If it is necessary to operate the hydraulic cylinder 6 in a floating mode (for example, the hydraulic cylinder 6 provides control of the position of the working body - a drum for laying ski runs, the drum in this position lies on the ground and copies the terrain), the distributor 5 is installed in one of the operating positions, and the device 11 works in unloading mode.

If it is necessary to ensure a regime in which the working body, the position of which is ensured by the position of the hydraulic cylinder 6, provides loading with a certain force of the object that is affected by the working body (the drum is pressed with a certain force to the snow cover of the soil - the terrain), electromagnets 14.15 , ensuring the connection of the cavity 8 of the hydraulic cylinder 6 with the drain, and the cavity 7, through the distributor 9 with the output of the check valve 3 and the main hydraulic system. Moreover, in the cavity 7 of the hydraulic cylinder b there will be pressure due to the adjustment of the pressure reducing valve 2, which provides suppression of the working body. When the machine drives the working body to any obstacle that causes the hydraulic cylinder 6 to rise, the valve 10 ensures that the cavity 7 is connected to the drain, and the valve 10 must be set higher than the pressure reduction valve 2. The presence of the check valve 3 protects the main hydraulic system when - the appearance of a pressure peak in the cavity 7 of the hydraulic cylinder b when exposed to it

any obstacle, which increases the reliability of the hydraulic system of the machine as a whole.

Thus, the proposal provides a more reliable operation of the system, its

simplification while expanding its functionality - the presence of a floating position of the working body without load, which does not require (compared with the prototype) additional regulation

lining work.

Claims (1)

SUMMARY OF THE INVENTION A hydraulic system of a road machine comprising a hydraulic system of basic working equipment and a hydraulic system of auxiliary equipment including an actuating hydraulic cylinder with lowering and lifting cavities connected via a three-position distributor to a pressure source and drain, a pressure reducing valve, the inlet of which is connected to the main hydraulic system, and the output to a two-position distributor, a pressure valve, the lowering cavity being connected to the pressure reducing the valve and is connected via a DIP valve and a pressure valve with a drain, while the pressure source is equipped with an unloading and safety device, characterized in that, with In order to increase operational reliability while expanding the functionality of the system, the lowering cavity of the hydraulic cylinder is connected through a two-position valve to a three-position valve and through a non-return valve to the outlet of the pressure reducing valve, the inlet of the pressure valve is connected to the output of the non-return valve, into the control of the two-position and three-position valves distributors are interlocked.