The pressure jack of screw jack manufacturers in china has the characteristics of compact structure, stable work, high supporting force and self-locking. The supporting capacity of hydraulic jack is strong, and the supporting force of heavy hydraulic jack exceeds 100t.
Under what circumstances is the hydraulic jack simply damaged?
1. The quality of hydraulic jack seals is not good
The structural planning of the hydraulic jack seal is unreasonable, the material is not good, the manufacturing process and accuracy are poor, the mold has shortcomings, and the trimming has shortcomings that cause damage to the hydraulic jack
2. Reasons for storage, transportation and maintenance of hydraulic jacksHydraulic jacks are damaged due to excessive storage and improper humidity, corrosion by oxygen and ozone, improper storage conditions, and improper maintenance.
3.the quality of hydraulic jack accessories manufacturing and equipment is poor. The machining accuracy and surface roughness of the hydraulic jack accessories do not meet the requirements, and the processing method is unreasonable. When the seal passes through the sharp edges and the top of the thread during the installation, the lip is damaged due to the failure of maintenance and the hydraulic jack is damaged.
4. the planning structure of hydraulic jack accessories is unreasonable.
The seals selected by the hydraulic jacks cannot meet the requirements of working pressure, speed and temperature, are not compatible with the oil medium and environmental conditions, the grooves of the device seals are not properly planned, the gap and shrinkage are unreasonable, and they are not paid attention to. Anti-corrosion, anti-vibration, pressure equalization, etc., all belong to the unreasonable planning structure of the spouse, which causes damage to the hydraulic jack during use
The above is the related matters of hydraulic jacks, the screw jack manufacturers in china hope to help you.
The hydraulic jack manufacturers in china introduced some methods to inspect the jack.
During the placement of the jack, keep the line of action of the load's center of gravity consistent with the jack axis. During the jacking process, it is necessary to strictly prevent the jack from tilting or tilting due to the jack foundation sinking or the horizontal displacement of the load. To prevent the jack from sliding in contact with the metal surface of the heavy object or the smooth surface of the concrete, use hardwood blocks.
What are the methods to test the quality of jacks
dynamic load test
Put the jack on the equipment that can meet the requirements of the dynamic load test at room temperature. The hydraulic jack should meet the requirements of 22.214.171.124 in JB2104-91 "Hydraulic Jack", and the screw jack should meet the requirements of JB2592-91 "QL Screw Jack" The provisions of 126.96.36.199.
The outer surface of the product is sprayed with paint according to the regulations. The paint should adhere firmly, the surface of the coating should be uniform, and the color should be consistent. There should be no obvious spots, wrinkles, bubbles and other defects. The exposed processing surface should be treated with rust prevention.
Under the action of the test load of the rated lifting capacity, the operating force is measured at a distance of 50mm from the end of the handle. The force should be perpendicular to the axis of the handle, and the measured result should conform to the standard.
Static load test
At room temperature, apply the test load to the jack according to the method specified in the standard. The hydraulic jack should meet the requirements of 188.8.131.52 in JB2104-91 "Hydraulic Jack", and the screw jack should meet the requirements of 5.2 in JB2592-91 "QL Screw Jack". .1 regulations.
When the operation is tested under no-load condition, the jack operating mechanism should be flexible and reliable, there should be no tightness in the full stroke range, the rise should be stable, and the limit should be reliable.
After choosing the desired product from the screw jack manufacturers in china, the maintenance of multiple products also needs to have a certain understanding, which can extend the service time of the jack.