Boom Cylinder Seal Kit Komatsu 721-98-01560 7219801560 Boom Cylinder Sealing Kit For PC45MR-5M0 PC55MR-5M0

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Use Hydraulic Seals In The Right Way:

Seals can be used to prevent oil leaks and outside air, dust, etc. from entering the hydraulic system. Of course, it is impossible for a hydraulic cylinder to be absolutely sealed, because the reciproC.A.Ting motion of the piston rod always brings out the oil. However, this leakage is required to be as small as possible. Conversely, if the piston reciproC.A.Tes without oil, the piston rod is in a state of dry friction, which will affect the working performance and life of the hydraulic cylinder.

Hydraulic seals are the core of hydraulic equipment and guarantee the normal operation of hydraulic equipment. First of all, it is necessary to understand the environmental conditions such as the working performance, working pressure, working oil temperature, working medium, hydraulic oil and movement speed of hydraulic equipment.

At the same time, it is also necessary to understand the structural form, sealing characteristics, price and performance of the sealing material of the hydraulic seal to ensure the design and manufacture quality of the seal, sealing surface, sealing groove and components. Sealing quality, enhance contamination and protection awareness of hydraulic oil. Strengthen the supervision and inspection of hydraulic oil pollution. Hydraulic oil pollution should be replaced in time, and the storage and preservation of hydraulic seals should be done well.

On this basis, comprehensive analysis and comparison are carried out, and common hydraulic seals with suitable materials and structural forms are selected. When buying hydraulic seals for repair, most users will buy based on the size and color of the sample, which will only increase the purchase volume. Not only is it difficult, but it may not be possible to choose the right product.

The effect of different medium pressures and pre-compression ratios on seals:

The Vons Mises stress distribution of the seal at different medium pressures. It can be seen from the results that as the medium pressure continues to increase, the seal part is squeezed into the gap, and the maximum stress also moves from the middle area to the right, and finally at the corner. When the maximum value is reached, the contact part between the seal and the corner of the seal groove is often the part where the O-ring seal is damaged by shearing.

Therefore, when the working pressure of the medium is high, it is necessary to choose a material with higher hardness or place a retaining ring on the low pressure side of the seal to prevent the seal from being squeezed out, prolong the life of the seal, and reduce the possibility of seal failure;

When the O-ring is assembled with interference, it squeezes with the upper and lower flanges, resulting in radial compression displacement, and there is contact stress on the contact surface. When the contact stress exceeds the medium pressure, it will prevent the fluid from flowing to the other side, thereby Sealing is achieved.

Therefore, the size of the contact stress reflects the sealing ability of the seal, and the necessary condition to ensure the effective sealing of the seal is that the maximum contact pressure on the sealing interface is greater than or equal to the medium pressure.

From the contact stress distribution curves of the contact surface between the upper flange and the O-ring under different pre-compression ratios, it can be seen that the contact stress on the contact surface exhibits a parabolic distribution, and the contact stress reaches the maximum value at the midpoint of the contact length , and then the stress gradually decreases from both sides of the peak point, which is similar to the distribution law of the famous Hertz contact curve. With the increase of the pre-compression of the seal, the contact stress and contact length increase continuously.

In the curve of the maximum contact stress under different pre-compression, it can be seen that the maximum contact stress on the contact surface increases approximately linearly with the increase of the pre-compression rate of the seal, but too large a compression rate will make the seal It is beneficial to enhance the sealing effect, but too large a compression rate will cause a large residual deformation of the seal, resulting in stress relaxation, resulting in leakage.

Therefore, under the condition of ensuring effective sealing, an appropriate amount of pre-compression should be selected as far as possible to ensure the service life of the seal.