Top Scraper Seals

    On November 3, 2019, in order to enrich the staff's amateur cultural lifeand create a healthy and positive, united corporate culture atmosphere, DMS organized all employees and family members to gather together to develop a fun garden party.     The game project of the Garden Party had"two-person three-legged" that challenged the coordination of the body and the tacit understanding of the teammates. The game scene was lively and joyful, bringing a little relaxation to the intense work of the staff. The company's（Seal Manufacturer） leaders also participated, and everyone had a good time together. Once a game project was completed,there was a beautiful gift.    The smooth development of this activity not only enriched the amateur cultural life of employees, but also enhanced the teamwork ability of employees through the participation of all employees, creating a united and positive working atmosphere.

1SPGWSPGW seal, applied to piston two-way seal with high temperature resistance, strong extrusion resistance, low friction coefficient, small installation groove and small static leakage.It is an ideal engineering mechanical seal. The main disadvantage is the need for special tooling for installation.2SPGOSPGO seal, applied to piston two-way seal with high temperature resistance, strong extrusion resistance, very low friction coefficient. It can be applied to high-speed sports cylinders, small installation grooves, and widely used in engineering machinery. The main disadvantage is that special tools are required for installation, and the amount of static leakage is large.3RSJRSJ seal, applied to the piston rod one-way seal with high temperature resistance, strong extrusion resistance, low friction coefficient, small installation groove, generally used as buffer seal, widely used in engineering machinery hydraulic cylinders. The main disadvantage of this type of seal is that if it works alone, there will be a large amount of leakage, so generally only a buffer seal is used.4KZTKZT seal, also known as anti-fouling ring, is installed at the outermost end of the piston seal. The main function is to prevent the stain in the hydraulic oil from entering the main seal position of the piston, causing damage to the main seal and secondly preventing gas enter the main seal and create a gas explosion or Diesel effect on the main seal. Commonly used in construction machinery and metallurgicalmachinery cylinders.5WRWR, guide ring is installed at the two ends of the piston seal or the front end of the piston rod seal. The main function is to guide the movement of the piston and the piston rod to prevent the metal parts from directly contacting the strain, avoid eccentric piston rod and piston, keep reasonable extrusion clearance for seal, isolate the air explosion on seal damage and other protection. The main advantage of this kind of guide ring is that it has large bearing capacity, but the disadvantages are: the friction coefficient is much larger than that of the Teflon-filled guide tape; it is easy to age and become brittle and crack at high temperature.

Engineering machinery seal design points:1, Choose a reasonable sealing program, focusing on the following requirements.First, consider that the dust-proof performance must be good. More than 80% of the failures of the hydraulic system are directly or indirectly derived from the stains in the system.2, Choose the best sealThe seals of the same structure, the product quality of each company is very different. On the whole, the quality of foreign large seal parts company is relatively stable, but the probability of encountering fake goods is too great. Sometimes the so-called direct supply is not reliable. Most of the domestic seals are not very good, but at present some manufacturers' products have been catching up or even surpassing imported products, and the quality is stable and reliable, such as the tetrafluoroethylene and rubber seals produced by DMSSEALS.3, Choose the right sealing materialThere are many types of sealing materials, including a variety of metals, plastics and rubber. The same material, different company products have different performance. On the other hand, the same seal has different performances in different working conditions or different sealing schemes, so it must be carefully considered when selecting.Note: Be sure to consider the seals under the premise of a reasonable sealing scheme, thenthe sealing material, and thenthe seal manufacturing company. If you don't have enough sealing experience, it's best to consider the seal company first, and let the seal company consider issues such as sealing solutions, such as DMS SEALS.Engineering machinery seal use points:1. There must be a dust-free site during installation to prevent dust from being introduced into the system during installation.2, Each mounting must be clean, iron filings, rust, paint, welding slag, etc.3, To prevent dust from entering the tank mouth and other places (such as refueling).4, Replace the filter element on time, the hydraulic system will produce stains during work, must be removed by replacing the filter.5. The hydraulic oil will gradually deteriorate and oxidize during work, and the hydraulic oil must be replaced on time.6. When replacing the oil pipe or other parts at the work site, pay special attention to dust and dirt. 

High and Low Temperature ResistanceBecause of the long-term continuous work, if it is outdoor in summer, the hydraulic oil temperature of the machine may exceed 100 °C, which requires the seal to withstand high temperatures. If it is outdoor in winter, the temperature may be around -40 °C when it is turned on, and the seal is required to withstand low temperatures. Therefore, the sealing system is required to have a wide temperature range.Stain ResistanceThe machine itself travels, and the hydraulic tank is generally relatively small due to volume and weight limitations.Because of the size and weight limitations of the system, it is impossible to install the ideal filtration and cooling system. Due to high temperature, high pressure, and high speed, the hydraulic oil is easily deteriorated, which is the aspect of endogenousstains.There are many stains in the hydraulic oil, but there is no thorough filtration. This is the endogenous stain.The working environment can be very dusty, and it is inevitable that dusts will enter the hydraulic system in multiple ways, causing oil pollution, which is external stains.Therefore, the sealing system is required to be resistant to stains.Good Sealing PerformanceBecause the system works outdoors, there is no leaking oil recovery system, and the working medium leaks directly to pollute the environment, so the external leakage requirements are strict. At the same time, for hydraulic oil heating control, pressure holding or maintaining position requirements, so the internal leakage requirements are also very strict.High PressureResistanceThe working pressure of the hydraulic system is high, usually above 20MPa, and some reach about 40Mpa, which is higher than the pressure of the hydraulic system of general industrial application, so the sealing pressure requirement is high.The Wear ResistanceBecause of the high pressure and high temperature of the system pressure, the wear is particularly serious, so the seal is required to have good wear resistance.Low Friction CoefficientFor excavators, pump trucks and other construction machinery, the hydraulic system has high pressure, the cylinder moves fast, and the seal wear is particularly serious. Therefore, the friction coefficient of the seal must be low, so that the seal can have good wear resistance and a suitable life.