(1) Reasonably choose the size of the seal ring and seal groove.

The fixed hydraulic lifting platform must be reasonably selected for the sealing device, and must be familiar with the forms and characteristics of various sealing devices, the characteristics of the sealing materials and the use conditions of the sealing device, such as the size of the working pressure, the temperature of the working environment, and the temperature of the moving part. Speed ​​etc. Comparing the actual use conditions with the allowable use conditions of the seals, it is necessary to ensure that the sealing device has a good sealing performance and a long service life.

The sealing material should be compatible with the hydraulic oil, and its hardness should be appropriate. The hardness of the rubber material should be selected according to the working pressure of the system. For the pressure of the system, a seal with high rubber hardness should be selected. If the pressure is too high, a support ring needs to be designed.

In order to make the seal reliable and long life, when designing the seal groove, there must be an appropriate compression rate and extension, and the compression rate cannot be too large or too small. If it is too large, the compressive stress will increase, the friction will increase, and the seal wear will be accelerated. It is also easy to produce distortion and damage, shorten the service life, and sometimes cause assembly difficulties; if it is too small, the sealing performance will be poor and leakage will occur.

O-shaped sealing ring has a simple structure, easy installation, good sealing performance and reliable work, and there is almost no leakage when used as a static seal, so it is currently a relatively widely used seal. The amount of stretch is for the O-ring with inner circle and outer circle for sealing. From the perspective of improving the life, the design should try to avoid the center line of the seal ring diameter from being stretched, so the seal ring should be selected according to the national standard as far as possible , And the sealing groove should also be designed according to the corresponding standard. It is only necessary to design by itself, but the dimensional tolerances must be strictly controlled, and the roughness must meet the requirements, because the width or depth of the sealing groove is too large, which will cause insufficient compression and cause leakage.

(2) The design of parts and pipeline structure should be reasonable

When designing parts, there must be a guiding angle to avoid damage to the seal during assembly. When assembling the seal ring at the location with sharp edges and grooves, use a protective sleeve to avoid damage to the seal.

When setting up the hydraulic pipeline, the distance between the oil tank and the actuator should be as short as possible, and the elbow of the pipeline, especially the 90° elbow, should be as few as possible to reduce pressure loss and friction.

Pipe joints should be minimized in the hydraulic system of the lifting platform. 30%-40% of the system oil leakage is caused by pipe joints.

(3) To control the oil temperature of the hydraulic system

If the oil temperature is too high, the lubricating oil film will become thinner, the friction will increase, the wear will increase, and the sealing material will age faster, making it harder and brittle, and may quickly lead to leakage.

Controlling the increase in temperature of the hydraulic system generally starts from the design of the oil tank and the setting of the hydraulic pipeline. In order to improve the heat dissipation effect of the fuel tank, the heat dissipation surface of the fuel tank can be increased, and the oil discharge and return inside the fuel tank can be separated by a baffle. The temperature of the hydraulic oil in the tank is generally allowed to be between 55°C and 65°C, and the temperature should not exceed 70°C. When the oil temperature of natural cooling exceeds the allowable value, it is necessary to add a cooling water pipe inside the oil tank or install a cooler on the oil return line to reduce the temperature of the hydraulic oil.

(4) Choose hydraulic components and pipe joints with appropriate structures

Choose suitable hydraulic components, such as solenoid directional valves. If the system does not require fast switching, a wet solenoid valve should be selected. Because the wet solenoid valve has a long life and small impact, there is no dynamic seal at the push rod, which eliminates the leakage caused by the push rod.

There are three types of pipe joints commonly used in hydraulic systems: flared, ferrule and welded. These three types of joints have their own characteristics and should be selected according to working reliability and economy. Flared joints are generally cheaper, and ferrule joints can withstand large vibrations. Welded joints are used in occasions that can withstand high pressure, high temperature, and large mechanical loads and strong vibrations.

(5) Strictly control manufacturing quality

Strictly control the dimensional tolerance of the sealing groove, and the surface roughness must meet the requirements of the drawings. There should be no burrs and bruises on the edge of the groove, and it must be cleaned before assembling.

The size of the sealing cover and the screw holes of the flange cover should be of high quality, and the gap should not be too large to avoid the sealing element being extruded.

In addition, in the production of lifting platforms, it is necessary to strengthen maintenance and management, regularly inspect and repair hydraulic equipment in a planned manner, protect hydraulic equipment, prevent mechanical vibration and shock pressure, and discover equipment leakage in time, thereby reducing failures and oil leakage. Extend the life of the machine and improve the integrity rate of the equipment.

The above measures for the lifting platform to solve the leakage of the hydraulic system are basically summarized in detail in all aspects of the hydraulic system leakage. When using and repairing the hydraulic system, you should use it flexibly and sum up experience in time. The purpose is to prevent leakage from causing safety accidents due to minor incidents.