Komatsu Bottom Dump Cylinder Seal Kit 2086395300 208-63-95300 For PC400-1 PC400LC-1 Bottom Dump Cylinder Repair Kit

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Company brief:

Guangzhou Suncar Construction Machinery Co., LTD., founded in 2014, is a foreign trade company specializing in the wholesale and retail of construction machinery seals. Its current business covers many regions at home and abroad.Over the years, we have focused on the innovation and development of manufacturing technology, and have a highly automated production and processing base, providing excavators, bulldozers and other equipment with high-quality sealing parts and accessories, one-stop solution to the maintenance problems of construction machinery.

Loose card always adhere to the "quality to build the core competitiveness, innovation to change the world" business philosophy, vigorously explore overseas markets, develop the science and solid brand strategy planning, on the basis of quality, each type of product made the instruction manual production technology, from raw material selection to each link of manufacturing and processing have strict standards, multilayer testing verifiC.A.Tion, to ensure product quality and performance in accordance with using the standard, size, model can accurately fit the corresponding mechanical equipment, machinery spare parts "made in China" quality feeling and the internationalization of the brand image.

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.