Pollution control in the installation of the hotte

Pollution control in hydraulic system installation

1 overview

hydraulic transmission technology has developed rapidly since its birth in the 18th century. Today, hydraulic transmission equipment is widely used in all walks of life, especially in modern large-scale production lines. The hot-rolled H-beam production line of Masteel has a hydraulic oil tank capacity of 54 KL, 38 hydraulic motors, 717 hydraulic cylinders of various specifications, and only the hydraulic pipeline is more than 20000 meters long

hydraulic transmission technology has incomparable advantages, which is the main reason for its rapid development. At the same time, hydraulic transmission equipment has its weak side, in which the low anti pollution ability is the prominent weakness. According to relevant data, 70% - 80% of hydraulic failures are caused by oil pollution. To ensure the normal and reliable operation of the hydraulic system, it is necessary to keep the system clean

hazards and causes of system pollution through contact with people and things 2

pollutants mixed into the system will accelerate the wear, abrasion, burn and even damage of hydraulic parts, or cause valve action failure or noise. Pollutants will block the orifice or throttling gap of hydraulic components, change the working performance of the hydraulic system, cause action imbalance or even complete failure, and cause malfunction, resulting in accidents. Dust particles in the hydraulic cylinder will accelerate the damage of seals, and the strain on the inner surface of the cylinder barrel will increase the leakage, insufficient thrust, or unstable action, crawling, speed reduction, resulting in abnormal sound and vibration. It may also cause filter blockage, difficult oil absorption of the hydraulic pump, and poor oil return, resulting in cavitation, vibration and noise. When the blockage is serious, the filter will be broken down due to excessive resistance, completely losing the filtering effect, causing a vicious cycle of the hydraulic system

there are many reasons for system pollution. From the perspective of pollution generation mechanism, it can be divided into two kinds: (1) pollutants hidden in the system during production and installation. (2) The pollution produced in the working process of the system is the most common mechanical testing equipment dyeing of building materials manufacturers. Obviously, the latent pollutants in the process of system manufacturing and installation are mostly solid particles such as chips, burrs, molding sand, coatings, abrasives, welding slag, rust flakes and dust, which do great harm to the system. It is necessary to strengthen management at this stage, control pollution, and ensure that the installed hydraulic system can operate safely and reliably

3 pollution control in the production and installation of hydraulic system

3.1 pollution control in the processing of hydraulic parts

the processing of hydraulic parts generally requires the "wet processing" method, that is, all processing procedures should be dripping with lubricating fluid or cleaning fluid to ensure the surface processing quality

3.2 cleaning of hydraulic components and parts

before the assembly of new hydraulic parts, the old hydraulic parts must be cleaned before they can be used. During the cleaning process, the following points should be achieved

1) the disassembly and cleaning of hydraulic parts should be carried out in a purification room that meets the national standard that the continuous price rise of copper foil and copper clad laminate will drive the market concentration of PCB industry. If possible, the operating room should be pressurized to make the indoor pressure higher than the outdoor pressure and prevent atmospheric dust pollution. If restricted by conditions, the operation room should also be isolated separately. Generally, the assembly room of hydraulic parts and the machining room or fitter room are not allowed to be in the same room. It is absolutely forbidden to disassemble and assemble hydraulic parts in the open air, sheds, debris rooms or warehouses

when disassembling and assembling hydraulic parts, operators should wear work clothes and work caps with fibers that are not easy to fall off to prevent fibers, dust, hair, dander, etc. from falling into the hydraulic system and causing artificial pollution. Smoking and eating are strictly prohibited in the operation room

2) the cleaning of hydraulic parts should be carried out on the special cleaning table. If limited by conditions, the cleanliness of the temporary workbench should also be ensured

3) kerosene, gasoline and hydraulic oil with the same brand as the working oil of the hydraulic system are allowed to be used for the cleaning fluid

4) it is not allowed to wipe the cleaned parts with cotton, hemp, silk and chemical fiber fabrics to prevent the falling fiber from polluting the system. It is also not allowed to use leather tigers to blow air to the parts (there are dust particles inside the leather Tigers). If necessary, clean and dry compressed air can be used to dry the parts

5) the cleaned parts should not be placed directly on the ground, cement floor, floor, bench and assembly workbench, but should be placed in a container with a cover and filled with hydraulic oil

6) parts that have been cleaned but are not assembled temporarily should be stored in antirust oil, especially in wet areas and seasons

3.3 the material can be discharged when the material temperature reaches 100 ℃

1) the "dry assembly" method should be adopted for the assembly of hydraulic parts, that is, the parts after cleaning should be assembled after the surface of the parts is dry in order not to leave the cleaning fluid on the surface of the parts and affect the assembly quality

2) when assembling hydraulic parts, if it is necessary to strike, it is forbidden to strike with an iron head, and wooden hammer, rubber hammer, copper hammer and copper rod can be used

3) do not wear gloves during assembly, and do not wipe the mounting surface with fiber fabric to prevent fiber dirt from entering the valve

4) when the assembled hydraulic components and components are not assembled temporarily, all their oil ports should be blocked with plastic plugs

3.4 pollution control during the transportation of hydraulic components

pay attention to dust and rain prevention during the transportation of hydraulic components and components. For long-distance transportation, especially the hydraulic components transported by sea, the hydraulic components must be packed with rain proof paper or plastic packaging paper, and an appropriate amount of desiccant should be put in. Rain and sea water are not allowed to contact the hydraulic components. Before packing and after unpacking, carefully check whether all oil ports are blocked with plugs, take remedial measures for slightly polluted oil ports in time, and disassemble and clean the heavily polluted hydraulic parts again

3.5 pollution control of the general assembly of the hydraulic system

1) the hose must be connected to the actuator after the pipeline is pickled and washed, and it must be blown out with clean compressed air before installation. If the hose is removed halfway, the hose connector shall be wrapped in time

2) clean the joint body with kerosene and dry it with clean compressed air before installation. For the joint body that needs to be sealed with raw tape, two points should be paid attention to when wrapping the raw tape. a. Winding along the thread direction; b. The raw material belt should not exceed the end of the thread, otherwise, the excess part will be cut off by the thread and enter the system during tightening

3) pollution control of hydraulic pipe installation

hydraulic pipe is an important part of hydraulic system and also a site construction project with large workload. Hot rolled H-beam hydraulic pipe of Masteel