SU750148A1 - Hydraulic system for levelling platform - Google Patents

Description

(54) HYDRAULIC PLATFORM ALIGNMENT SYSTEM

one

The invention relates to the field of hydraulic drive control systems and can be used to align the bottom frame of powerful excavators supported by plunger jacks on autonomous track-type trucks.

A hydraulic platform leveling system is known, containing two pairs of plunger hydraulic jacks, the cavities of one of each pair of which communicate with the pressure and drain hydraulic lines through the main three-position four-way distributor and the cavities of the other two through a distribution device installed in the drain hydraulic lines two-position two-line distributor and safety valve one.

The distribution device in the specified system is made in the form of two two-line two-way distributors, which communicate the cavities of two hydraulic jacks with the main distributor.

The disadvantage of this system is low speed, due to the need to level the platform alternately diagonally.

The purpose of the invention is to increase the speed of the system.

This goal is achieved by the fact that the distribution device is made in the form of an additional three-position 5 four-line distributor installed parallel to the main one, moreover, in the drain line, two opposite-oriented check valves are installed in front of the two-line two-way distributor, and the safety 10 valve is equipped with an overflow spool control.

The drawing is a hydraulic system diagram.

The system contains two pairs of plunger jacks 1, 2 and 3, 4, Cavities 5 and 6 of the hydraulic jacks 1, 2 are connected to the main three-position four-line distributor 7, and cavities 8 and 9 of the hydraulic jacks 3, 4 are connected by a distributor, made in the form of an additional three-position four-line distributor ten.

Claims (1)

Distributors 7 and 10 communicate with the pump AND pressure hydraulic line 12, and with BOM atele drainage 13 through two-position two-way valve 14. Before valve 16, counter-mounted check valves 15 n 16 are installed. In pressure hydraulic line 12, a safety valve 17 is installed with control valve 18 . The hydraulic platform leveling system operates as follows. The platform is lifted by paired lifting of any pair of adjacent hydraulic jacks, for example hydraulic jacks 1.4 (or 2, 4, or 2, 3, or 1, 3) with the corresponding inclusion of valves 7 and 10. The distributor 14 is closed. When the subsidence of one of the jacks of the cavity of any adjacent pair of jacks communicate with each other. This is accomplished by connecting the cavities of the common hydraulic jacks through the distributors 7 and 10 and the hydrolic 12. The pump II does not work, the distributor 14 is closed. The flow of fluid between the cavities of another pair of hydraulic jacks through distributors 7 and 10 and hydraulic line 13 is prevented by the check valves 15 and 16 installed on it. If the platform is not horizontally aligned along one diagonal of hydraulic jacks 1, 2 (or .3, 4) or to both diagonal m hydraulic jacks 1, 2 and 3, 4 distributors 7 and 10 connect the cavities of the raised hydraulic jacks I, 4 (or 2, 3) to the drain hydraulic line 13 through the open distributor 14, and the cavities of the lowered hydraulic jacks 2, 3 (or 1, 4) with a pressure head hydroline 12. At alignment at the same time On two diagonals it is possible that the resultant gravity of the platform is installed in the zone of one of the jacks being lowered (1 or 3, 2 or 4), then by increasing the pressure of the fluid coming from the cavity of this jack, the check valve (15 or 16) closes and the alignment is automatically performed only on the diagonal with increased pressure and ONLY after the platform has been aligned to the horizontal position on the other diagonal. The platform leveling process continues until both diagonals are horizontal. During alignment, one hydraulic cylinder may be re-lifted (for example, I). In this case, the cavity 5 of the over-raised hydraulic cylinder 1 together with the cavity of any adjacent hydraulic cylinder (3 or 4) is connected to the drain via the valves 7 and 10 and the open safety valve 17. The valve 14 while closed, the pump 11 is not working. Claims of the hydraulic platform leveling system comprising two pairs of plunger jacks, the cavities of one of each pair of which communicate with the pressure and drain hydraulic lines through the main three-position four-line distributor, and the cavities of the other two - through the distributor installed in the drain lines of the two-position two-line distributor and safety valve, characterized in that, in order to increase speed, the switchgear is made in the form of additional An additional three-position four-line distributor installed parallel to the main one, moreover, in the drainage line, two oppositely oriented check valves are installed in front of the two-position two-line distributor, and the safety valve is equipped with an overflow control spool. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 254153 / 25-06, cl. F 15 B 11/22, 1977.