CN204938830U - A kind of Quick lifting device of hydraulic jack - Google Patents

Abstract

The utility model discloses a quick lifting device installed in a hydraulic jack, which comprises a hollow steel pipe, the steel pipe is placed in the inner chamber of a hydraulic rod of a large hydraulic cylinder and is coaxial with the hydraulic rod, and the top of the steel pipe is fixedly sleeved with a The piston is sealed and connected with the hydraulic rod, and the side wall at the bottom of the steel pipe has an oil outlet, and the oil outlet is equipped with a check valve inside the large hydraulic cylinder; the cross-sectional area of the steel pipe is equal to the transverse diameter of the small hydraulic cylinder of the hydraulic jack. Cross-sectional area; when the hydraulic jack is unloaded or lightly loaded, the hydraulic oil flows from the base of the large hydraulic cylinder to the bottom of the steel pipe; when the hydraulic jack bears heavy objects, the hydraulic oil flows into the large hydraulic cylinder through the check valve; On the one-way valve, the other end is connected to one end of the tightening screw, and the other end of the tightening screw is fixedly connected to the base of the large hydraulic cylinder; when the hydraulic jack is empty or lightly loaded, the hydraulic rod is quickly lifted, and the empty load and light load can also be adjusted load threshold.

Description

A quick lifting device for a hydraulic jack

technical field

The utility model is installed in a hydraulic jack, and is a device capable of lifting a hydraulic rod faster when the hydraulic jack is empty or lightly loaded.

Background technique

The hydraulic jack is composed of a large hydraulic cylinder, a large piston, a small hydraulic cylinder, a small piston, a wrench, a hydraulic rod, and an oil tank. When the wrench is lifted upwards, it drives the hydraulic rod of the small hydraulic cylinder and the small piston in the small hydraulic cylinder to move upward. The oil in the oil tank is sucked into the lower part of the small piston through the oil pipe and the one-way valve; when the wrench is pressed down, the small piston is driven downward, and the oil in the lower part of the small piston is pressed into the lower part of the large piston in the large hydraulic cylinder through the internal oil circuit, so that The large piston in the large hydraulic cylinder moves upward, and at the same time drives the hydraulic rod of the large hydraulic cylinder upward; due to the leverage, the pressure on the lower part of the small piston increases dozens of times, and the area of the large piston is dozens of times the area of the small piston. The force passes through the wrench It has been increased more than ten times on the small piston to generate jacking force. That is to say, if a small force is given to the hydraulic rod of the small hydraulic cylinder in the same hydraulic medium, then there will be a larger hydraulic pressure at the hydraulic rod of the large hydraulic cylinder at the load, which can lift heavier weights. The problem existing in the use of this existing hydraulic jack is: due to the small area of the small hydraulic cylinder, according to the principle of constant volume, the moving distance of the large and small hydraulic cylinders is inversely proportional to the ratio of the areas of the large and small hydraulic cylinders , so the transmission efficiency is low. In this way, when the hydraulic jack does not need to be loaded with heavy loads, such as when it is empty and lightly loaded, it is as slow as when it needs to be loaded with heavy loads, that is, when it is empty or lightly loaded. The lifting speed is the same as the lifting speed when carrying a heavy load, and the work of quickly lifting the hydraulic jack cannot be realized.

Contents of the invention

The purpose of the utility model is to solve the existing problems of the existing hydraulic jack, provide a quick lifting device of the hydraulic jack, improve the lifting speed of the hydraulic jack when it is empty or lightly loaded, and can complete the jacking of the hydraulic jack faster. lift work.

In order to achieve the above purpose, the technical solution adopted by the utility model is: comprising a hollow steel pipe, the steel pipe is placed in the inner chamber of the hydraulic rod of the large hydraulic cylinder and is coaxial with the hydraulic rod, the top of the steel pipe is fixedly sleeved with a The piston is sealed and connected, and the side wall at the bottom of the steel pipe has an oil outlet, and the oil outlet is equipped with a check valve inside the large hydraulic cylinder; the cross-sectional area of the steel pipe is equal to the cross-sectional area of the small hydraulic cylinder of the hydraulic jack; When the hydraulic jack is empty or lightly loaded, the hydraulic oil flows from the base of the large hydraulic cylinder to the bottom of the steel pipe. When the hydraulic jack bears heavy objects, the hydraulic oil flows into the large hydraulic cylinder through the check valve.

Further, one end of the push rod leans against the one-way valve, the other end is connected to one end of the tightening screw, and the other end of the tightening screw is fixedly connected to the base of the large hydraulic cylinder.

The utility model has the advantages of adopting the above technical scheme: the utility model changes the existing traditional single plunger hydraulic cylinder into a composite cylinder with two working chambers, which can quickly lift the hydraulic jack when it is empty or lightly loaded. The hydraulic rod speeds up the lifting speed, thereby improving the working efficiency of the hydraulic jack. At the same time, it can also adjust the load threshold of no load and light load, thereby effectively improving the working efficiency of the hydraulic jack.

Description of drawings

Fig. 1 is a perspective view of the appearance of the utility model;

Fig. 2 is the main sectional view of the utility model;

In the figure: 1. Tightening screw; 2. Push rod; 3. Check valve; 4. Flange; 5. Steel pipe; 6. Piston.

detailed description

Referring to Fig. 1, the utility model comprises a hollow steel pipe 5, the center of the steel pipe 5 is coaxial with the center of the hydraulic rod of the large hydraulic cylinder of the hydraulic jack, placed in the hydraulic rod inner chamber of the large hydraulic cylinder, the outer diameter of the steel pipe 5 is less than hydraulic rod inner diameter. There is a piston 6 in the fixed sleeve at the top of the steel pipe 5, and the piston 6 is sealed with the hydraulic rod. The piston 6 is used for sealing, and the hydraulic rod is lifted during work, so that the large hydraulic cylinder has a composite cylinder structure with two working chambers.

The bottom of the steel pipe 5 is fixedly connected to the base of the large hydraulic cylinder through the flange 4, and the bottom of the base of the large hydraulic cylinder is connected with an oil inlet valve, and the oil inlet valve is connected to the small hydraulic cylinder of the large hydraulic cylinder through an oil pipe. The side wall at the bottom of the steel pipe 5 has an oil outlet, and a check valve 3 is installed at the oil outlet. The check valve 3 is located inside the large hydraulic cylinder, and the check valve 3 is fixed on the base of the large hydraulic cylinder.

The central axis of the ejector rod 2 is perpendicular to the central axis of the steel pipe 5, the center of the ejector rod 2 is coaxial with the center of the one-way valve 3, one end of the ejector rod 2 leans against the one-way valve 3, and the other end of the ejector rod 2 is connected to the tightening screw 1 One end, the effect of push rod 2 is to withstand check valve 3 to steel pipe 5 direction during work, prevents its oil leakage.

The tightening screw 1 is coaxial with the ejector rod 2, and the other end of the tightening screw 1 is fixedly connected to the base of the large hydraulic cylinder. By tightening and loosening the tightening screw 1, it acts on the ejector rod 2, and the adjustment acts on the one-way valve 3 The hydraulic oil pressure can adjust the light load threshold.

The cross-sectional area of the steel pipe 5 is equal to the cross-sectional area of the small hydraulic cylinder of the hydraulic jack, and the speed of oil entering the large hydraulic cylinder is much higher than that of the existing traditional hydraulic jack.

When the utility model is working, when the hydraulic jack is in the no-load or light-load state, the hydraulic oil flows from the base of the large hydraulic cylinder to the bottom of the steel pipe 5 and enters the steel pipe 5. Compared with the cross-sectional area of the large hydraulic cylinder and the cross-sectional area of the small hydraulic cylinder The area ratio between the areas, the cross-sectional area of the steel pipe 5 and the cross-sectional area of the small hydraulic cylinder have a small change, so the oil inlet speed is basically the same as the oil output of the small hydraulic cylinder, and the check valve 3 is in the cut-off state. At this time, the hydraulic pressure The rod rises faster. When the hydraulic jack needs to bear heavy objects, the hydraulic oil pressure inside the steel pipe 5 becomes stronger. After exceeding the working threshold of the one-way valve 3, the one-way valve 3 opens, and the hydraulic oil flows to the large hydraulic cylinder through the one-way valve 3 at the same time. In the process, it becomes the working mode of the existing traditional hydraulic jack, and at this time, the hydraulic rod of the large hydraulic cylinder slows down.

After the utility model is used for a long time, the spring elasticity inside the one-way valve 3 will change, and impurities will also increase in the hydraulic oil, which will change the properties of the hydraulic oil, resulting in the check valve 3 with light load and heavy load of the hydraulic jack. The working threshold of the hydraulic jack changes, use the tightening screw 1 to change the change threshold of the hydraulic jack under heavy load and light load. After adjustment, change the threshold to facilitate work efficiency.

The tightening screw 1 and the ejector rod 2 should be designed according to the change of spring elasticity and the change of the working threshold inside the check valve 3 .

Claims (5)

1. A rapid lifting device for a hydraulic jack, characterized in that it includes a hollow steel pipe (5), the steel pipe (5) is placed in the hydraulic rod inner cavity of the large hydraulic cylinder and is coaxial with the hydraulic rod, the steel pipe (5) The fixed sleeve at the top has a piston (6) that is sealingly connected with the hydraulic rod, and the side wall at the bottom of the steel pipe (5) has an oil outlet, and the oil outlet is equipped with a one-way valve located inside the large hydraulic cylinder ( 3); the cross-sectional area of the steel pipe (5) is equal to the cross-sectional area of the small hydraulic cylinder of the hydraulic jack; when the hydraulic jack is unloaded or lightly loaded, the hydraulic oil flows from the base of the large hydraulic cylinder to the bottom of the steel pipe (5). When the jack bears heavy objects, the hydraulic oil flows into the large hydraulic cylinder through the check valve (3). 2. The rapid lifting device of the hydraulic jack according to claim 1, characterized in that: one end of the ejector rod (2) leans against the one-way valve (3), and the other end is connected to one end of the tightening screw (1). The other end of the screw (1) is fixedly connected to the base of the large hydraulic cylinder. 3. The rapid lifting device of the hydraulic jack according to claim 1, characterized in that: the center of the steel pipe (5) is coaxial with the center of the hydraulic rod, and the bottom of the steel pipe (5) is fixedly connected to the large hydraulic cylinder through the flange (4) base. 4. The rapid lifting device of the hydraulic jack according to claim 1, characterized in that: the one-way valve (3) is fixedly connected to the base of the large hydraulic cylinder. 5. The rapid lifting device of the hydraulic jack according to claim 2, characterized in that: the central axis of the ejector rod (2) is perpendicular to the central axis of the steel pipe (5), and the center of the ejector rod (2) is perpendicular to the one-way valve (3) Center coaxial.