SU529994A1 - Device for lifting large loads - Google Patents

Description

one

The invention relates to devices for lifting t of zhuman structures with jacks, in particular to group hydraulic jacks, and can be used in construction equipment, chemical and petroleum engineering when installing non-standard equipment.

There are known devices for lifting large loads containing a group of double-acting main-cylinder power cylinders, the piston cavities of which are connected to a pumping station through a common collector, and a group of additional-cylinder power cylinders.

A disadvantage of the known device is the impossibility of sustained progressive load lifting at the same time by several hydraulic jacks fed by one pump station, with an asymmetrical arrangement of external load.

The purpose of the invention is to automatically ensure the stability of translational motion under asymmetrical loading.

This is achieved by the fact that each cylinder of the additional jack is located symmetrically to one of the cylinders of the main jack, and their piston cavities communicate

Schenki with over piston cavities of the main jack cylinder.

FIG. 1 shows the proposed jack, plan; in fig. 2-section along the AA

FIG. one; in fig. 3 given the scheme of the device.

A number of power cylinders 2 of the main jack are vertically mounted in case I at equal distance from one another. Each

the cylinder has two high pressure chambers 3, 4.

The piston chamber of each cylinder of the main jack is connected by a pipe 5 to the collector 6, which is connected through a pipe 7 to a pumping station 8. Between the cylinders 2, the cylinders 9 of the additional jack are equally spaced from each other. Each cylinder 9 has one high-pressure chamber 10 connected by a tube 11 with a chamber 3 of a symmetrically located cylinder 2 of the main jack.

The rods 12 of all power cylinders are connected by means of a pin 13 to a frame 14.

for transmitting forces to the lifted load 15. The pump station 8 is connected via pipe 16 to a tank 17 in which the working fluid is located. To drain the liquid into the tank during the return stroke of the cylinder stock, there is a shut-off valve 18.

The operation of the device is as follows.

The working fluid, such as oil, is fed through a pumping station 8 into an abundant manifold 6 and further into the chambers 4 of cylinders 2, in which the same pressure is established,. corresponding to the total load capacity of the group jack.

In chambers 3 of each of the cylinders 2, different pressures are established depending on the external load coming on this jack, and the total load-carrying capacity of every two series-connected jacks, primary and secondary, is equal to, where I is the manifold pressure; F is the size of the camera of each jack, and the load capacity of each individual jack can vary from O to Q.

Thus, the resultant lifting force of the group jack can move depending on the place of application of external load, and thereby ensures the stability of synchronous operation of a number of jacks connected by a common collector in a wide range of application.

Claims (1)

Invention Formula A device for lifting large-sized cargoes, containing a group of double-acting main-cylinder power cylinders mounted on the frame, the piston cavities of which are connected to a pumping station through a common manifold and an additional cylinder power cylinders, in order to ensure sustained translational motion automatically under asymmetrical loading, each cylinder of the additional jack is located symmetrically to one of the cylinders of the main jack, and The crank cavities are in communication with the over piston cavities of the cylinders of the main jack. //  6