WO1999037574A1

WO1999037574A1 - A hydraulic, automatic device for raising a load and a method thereof

Info

Publication number: WO1999037574A1
Application number: PCT/CN1999/000008
Authority: WO
Inventors: Xuanzhe Hu
Original assignee: Mvp (H.K.) Industries Limited
Priority date: 1998-01-22
Filing date: 1999-01-21
Publication date: 1999-07-29
Also published as: CN1063728C; AU2044899A; CN1215693A

Abstract

The invention relates to a hydraulic, automatic device for raising a load and a method thereof, in which a lift spring is provided in the cylinder; a branch of the inlet pipe of the cylinder is connected to a tank via a check valve for replenishing oil; an accumulator with which the outlet pipe of the cylinder is communicated, a mechanically controlled check valve and an oil-returning rotary valve are successively connected by oil pipes; and the said oil-returning rotary valve consists of a front shutoff portion connected to the return pipe at the rodless end of the cylinder, a rear shutoff portion connected to the tank and a rotary handle. The whole controlling process can be finished by operating the oil-returning rotary valve for only one time.

Description

Full-automatic device and method for hydraulic jacking machine

Technical field

The invention relates to a fully-automatic control device and method for hydraulically continuously lifting a load. Background of the invention

Existing hydraulic jacking tools, such as jacks, approach the load very slowly, have low efficiency, and require external force to reset. For this reason, some published patent applications in recent years, such as CN 2061169 U, CN 7101038 U, CN 2107454 U, CN 2155365 Y CN 2172760 Y, CN 2194450 Y, CN 1112517 A, etc., have made technical improvements to improve work efficiency. Among them, the first four technical solutions are to increase the speed of the oil pump system. The last three technical solutions are to increase the speed by increasing the cylinder system. These technical solutions have the disadvantages of complex structure, poor reliability, and cumbersome operation. Summary of the Invention

The object of the present invention is to provide a fully automatic device and method for a hydraulic jacking machine that has a simple structure, is easy to operate, and transmits power in three ways: mechanical, gas, and liquid.

The invention is implemented as follows:

The rodless end of the oil cylinder is provided with a jack spring. The oil inlet pipe connected to the oil pump is equipped with a branch pipe through a one-way charge valve to the fuel tank. The accumulator, the machine-controlled check valve, and the oil return rotary valve are connected by oil pipes in order The oil pipe with a rod end of the oil cylinder connects the oil pipe between the accumulator and the machine-controlled check valve. The oil return rotary valve consists of a front cut-off unit, a rear cut-off unit and a handle. The tubing of the rear cut-off unit is connected to the fuel tank.

In the invention, the mechanical force of the spring is used to automatically achieve the light load in place, the hydraulic pressure is used to complete the heavy load boost and supply energy to the accumulator, and then the accumulator releases the pressure oil and combines the spring force to complete the automatic position. The invention has a simple structure and convenient operation. As long as the oil return rotary valve is opened and closed once, the entire control process is completed automatically. The huge energy of the heavy object falling is absorbed and buffered by the accumulator, which is not only safe and stable when the load drops, but also converts the potential energy of the heavy object into available kinetic energy. Drawing tube to explain

FIG. 1 is a structural schematic diagram of the present invention.

Mode of Carrying Out the Invention

Referring to FIG. 1, a branch pipe 17 connected to the fuel tank 10 is provided on an oil inlet pipe connecting the oil pump 1 and the oil cylinder 2. The branch pipe 17 is provided with a one-way charge valve 16. The cylinder 2 is provided with a piston 18 and a piston rod 3, a rodless end of the cylinder 2 is provided with a spring 15, and a bottom of the cylinder 2 is connected to the oil rotary valve 13 through an oil return pipe 14. The oil return rotary valve 13 includes a front cut-off unit 12, a rear cut-off unit 13 and a handle 9 with a bump point 8. The connection pipes of the front and rear cut-off units 12 and 11 are connected to the input end of the mechanically controlled check valve 7 with the bumper 19, and the output end is connected to the accumulator 6 through the oil pipe. The top of the oil cylinder 2 communicates with the accumulator 6 through an oil discharge pipe 4. A diversion tank 5 is installed below the drain pipe 4 of the oil cylinder 2 and communicates with the accumulator 6. In the normal state, the front and rear cut-off units 12, 11 for the two high-pressure seals on the same valve stem are opened. When the cylinder 2 has no rod end and no pressure, it is placed in the working position, and the tank passage is cut off by operating the rotary handle 9 and the rear cut-off unit 11. The touch point 8 opens the machine-controlled check valve 7, the oil in the accumulator 6. The oil from the fill valve 16 enters the lower end of the piston 18 of the cylinder 2 together with the force of the spring 15 to lift the piston 18, so that the piston rod 3 quickly contacts the workpiece to be jacked, and then the front cutoff unit 12 is closed, and the oil pump 1 supplies oil. In addition, the elastic mechanical force of the spring I ⁵ slowly lifts the weight up, the piston 18 reaches a high position, and the oil enters the accumulator 6 through the shunt groove 5. At the end of the work, the front cut-off unit 12 is opened, the weight is dropped, and the oil in the rodless end of the cylinder 2 enters the accumulator 6 through the mechanically controlled check valve 7, and then the contact point 8 leaves the mechanically controlled check valve Ί. When the lever 19 is pressed, the oil pressure in the accumulator 6 is locked, and immediately after the cut-off unit 11 is opened, the oil pressure of the accumulator 6 returns the piston I ^{8 of the} oil cylinder 2 to the original position, and is locked by the machine-controlled check valve 7 Close the oil path and stabilize at a low position.

Claims

Claim

1. A full-automatic device of a hydraulic jacking machine, which includes an oil pump, a cylinder, a one-way wide and a shut-off valve, which is characterized in that a jack-up spring (15) is disposed at the rodless end of the oil cylinder (2), and an oil pump (1) The connecting oil inlet pipe is provided with a branch pipe (17), an accumulator (6), a mechanically controlled check valve (7) and an oil return rotary valve (13) through a one-way charge valve (16) to the fuel tank (10). ) Are connected in order by oil pipes, and the oil cylinder (2) has a rod end oil drain pipe (4) connected to the oil pipe between the accumulator (6) and the machine-controlled check valve (7); the oil return rotary valve (13) consists of The front cut-off unit (12), the rear cut-off unit (11) and the handle (9) are composed, the front cut-off unit (12) is connected to the oil cylinder (2), and the oil return pipe (14) without the rod end is connected to the oil pipe of the rear cut-off unit (11). Fuel tank (10).

2. A full-automatic method of a hydraulic jacking tool, which is characterized in that it uses the mechanical force of a spring to complete the light load automatically in place, uses hydraulic pressure to complete the heavy-load boost and supply energy to the accumulator, and then the accumulator releases the pressure oil Combined with the spring force to complete the automatic position.