World

Study Proves the Importance of Correct Selection of Excavator Cylinder Seals

Published

5 years ago

May 16, 2019

The working condition of the excavator cylinder is very hard. Challenges are as follows: the working pressure of the hydraulic system is large; the impact pressure is relatively high; the lateral load is large; the working temperature and the moving frequency are relatively high. Therefore, the performance of the excavator cylinder will have a direct impact on the quality of the entire machine.

Excavator cylinder components mainly include: a cylinder, piston, piston rod, bumper, external seals and standard parts.

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1. Piston seals

The seal of the piston is composed of a wear ring, an anti-pollution seal ring and a combined seal ring.

The wear ring can support and guide the piston to avoid eccentricity or scratching, and it has a certain effect on enhancing the durability of the seal. The support belt must be a product with high load carrying capacity.

Wear ring for the general use of cloth to strengthen the interlayer phenolic resin. It has good wear resistance and bearing pressure. The pressure of the phenolic cloth guide belt can reach 300Mpa, which is ten times that of the Teflon bronze guide belt. The anti-pollution sealing ring can effectively avoid the oil mixing in the cylinder. Impurities cause damage to the seal. And to provide a guarantee for the life of the seal.

The material of the anti-pollution sealing ring is a polytetrafluoroethylene resin with good immersion impurities. It has a slit and a hydraulic bypass groove in the structure, which can effectively avoid the accumulation of oil pressure.

Two-way combination seals are often used in cylinder piston seals because they save space.

2. Sealing of the piston rod

The sealing structure of the piston rod includes: a sealing ring, a buffer ring, a retaining ring and a dust seal.

The seal ring has the function of sealing hydraulic oil. There is a high demand for the choice of sealing ring material, which not only has good impact resistance, wear resistance and crush resistance but also has superior sealing properties. The buffer ring acts as a buffer for decompression of the high pressure oil in the high pressure oil, thereby further reducing the pressure of the main seal. There is a retaining ring at the bottom end of the seal, which has strong anti-squeezing ability, so it can effectively prevent the buffer ring from being squeezed. In addition, the pressure generated by the retaining ring and the main seal can lubricate between the piston rod and the guide sleeve. Friction, but this requires that the buffer ring must have a reflow property to prevent excessive pressure between the buffer ring and the main seal. Therefore, the material of the buffer ring must have good wear resistance and crush resistance. Impact resistance.

The dust ring not only effectively isolates the dust, it also protects the equipment, and it also protects against oil. The movement of the live rod in the guide sleeve requires a certain oil film to be lubricated. The outer lip of the dust ring is likely to cause the oil film to aggregate to form an external leak. Therefore, this requires the inner lip of the dust seal to have a certain anti-scratch effect, hinder the leakage of the oil film.

3. Static seals

Excavators are sealed with O-rings, using nitrile rubber as raw material, and Shore hardness is in the range of 75-90. Because of the high system pressure, the 0-ring needs to be added with a retaining ring to avoid the occurrence of the O-ring being squeezed into the fit gap.

Standard of the sealing performance:

(1) Clearance of the seal ring

In the piston seal and piston rod seal, there is a certain gap between the movements. Factors affecting the gap size include: system pressure, seal material and section thickness, dynamic edge diameter and environmental degree. If the gap is large, not only will the tearing of the sliding edge of the seal root and the stationary side cause the root to be squeezed out, causing the seal to fail. Therefore, the size of the gap has a direct impact on the sealing performance, service life and processing cost of the seal.

(2) Guide belt width

Depending on the use of the guide belt to allow deformation, the corresponding curve can be selected, and the smaller telescopic deformation can ensure the guiding effect. The minimum guide strip width can be determined from the corresponding values and formulas, and then the appropriate guide strip width can be selected.

(3) Assembly and inspection of oil cylinders

When assembling the cylinder, firstly, the parts of each part are separately loaded into the relevant components, and then installed from the inside to the outside.

It is important to choose the correct excavator cylinder seal. YBAS offers professional and high quality seal kits.

World

Creating Better Hiring Practices: How KENTECH Can Improve New Employees

Published

21 hours ago

September 15, 2024

Rosario Farell

Although some may think background checks are only necessary for high-security jobs like government positions or teaching roles, most employers could benefit from the additional insights that a background check provides. In addition to providing information about an applicant’s criminal history, employers can use background checks to understand their abbreviated credit history or confirm information like employment, educational, and licensure history.

Why background checks are important

Unfortunately, while one would like always to assume the best, the truth is that not everyone is telling the truth. A study by SHRM found that 31% of people admitted to lying on resumes, while 56% admitted to “stretching the truth.”

This statistic makes it abundantly clear that business leaders must not feel comfortable simply trusting prospective employees’ applications at face value. It’s better to be safe than sorry, so a background check is used to confirm important information about an applicant and help make a better, more informed hiring decision.

At KENTECH, a leading background check technology provider, the team likes to say that they help their clients hire “not just the best person, but the right person.” After all, the cost of hiring and onboarding a new employee is extensive. Indeed reports that these costs can range from $4,000 to $20,000 per new employee.

If a hiring decision is made, only for that person to not perform well in the role and have to be let go shortly after, that’s a lot of money wasted. It’s better to make sure that you are making the right decision from the beginning.

KENTECH’s revolutionary background check technology

Some of KENTECH’s cutting-edge background check technology solutions include:

● Employment Verification Program (EVP): KENTECH’s Employment Verification Program is a web-based service designed to help streamline the background check process for employers. It gives employers one location through which they can manage the entire process from start to finish. Users can order background checks and verifications and easily manage documents — all from a single, convenient dashboard.

● Report Investigative Scoring Count (RISC): KENTECH’s RISC system helps organizations quickly interpret screening results at a glance. An organization can set up the criteria that matter most to them for screenings, and each background check will be labeled with a color code corresponding to the criteria set by the business. This provides employers with a visual cue for what applications may require closer scrutiny and helps identify which candidates may be most qualified.

● Rapid Application Center (RAC): KENTECH’s Rapid Application Center technology allows applicants to input their information and order background checks themselves. This saves hiring teams time with minimal burden to the applicant. An applicant signs onto a custom-built website and enters their information so administrative staff don’t have to. Administrators then receive email notifications when a candidate posts their information and when results are returned, allowing them to sign on at their convenience to view them.

● Unified Bulk Screening (UBS): For businesses that screen a high volume of candidates, KENTECH also offers a solution called Unified Bulk Screening (UBS). Once business leaders sign into their EVP account and import a list of candidates and their required information, they can see up-to-the-minute results in their portal or opt to receive a consolidated report that displays all results at once.

However, although the primary audience of these developments is the business and its leaders, there are also some significant benefits to the candidate experience. If a background check feels obstructive and frustrating to an applicant, they may form a negative first impression of the business or even give up. The KENTECH team designed their technology to be easy to use, often able to be integrated into the application and HR management system to make the process as seamless and intuitive as possible.

Although background checks might seem like an extreme step for the average employer, with the help of technology like that offered by KENTECH, it doesn’t have to be. KENTECH’s advanced background check technology helps streamline the process, allowing employers to get better insight into their prospective employees without significantly burdening themselves or their applicants. With this, background checks can become a standard, beneficial step in virtually every job application.