How To Do The Oil Leakage Of The Sewing Machine And The Engine Block?

First, the problem leads.

Current high speed

The fully sealed type lubrication system is adopted, so that the service life of parts can be greatly improved in the process of high-speed or high-speed operation, but at the same time, it also increases the chance of oil contamination.

As customers' requirements for avoiding oil pollution are getting higher and higher, the oil leakage of the sewing machine has become a very important research topic.

Oil pan as a part of oil directly contact with oil, combined with the operation of the oil pump when the machine runs at high speed, the oil in the oil pan is boiling, and the long and high-speed operation of the machine makes the oil tray have a certain temperature rise and pressure, which causes the oil tray and the seat to be easily leaking, and it is difficult to completely eliminate it.

This article mainly describes the accumulation of its own practice and through a large number of experiments to find out the main causes and related factors of the oil leakage, so as to ensure that the oil leakage between the oil pan and the engine block is ensured in the design and part quality so as to prevent the oil leakage completely.

Two. Introduction of sealing structure of oil pan and frame of high-speed sewing machine

Normally

Surrounded by an annular oil groove, the oil groove is equipped with a sealing ring 2, the seat 3 is placed on the sealing ring, and the oil pan and the machine seat are tightly suspended by four screws 4.

Because of the pre tightening pressure of the sealing ring, the oil can be sealed in the oil pan and will not leak.

However, due to various reasons, the actual assembly and user use is not always the case, and oil leakage often occurs.

For this reason, we launched the following investigation and research.

Three. Test and solution for leakage of oil pan

(1) early test methods

1. re milling the annular oil groove and the upper plane of the oil leakage oil pan to ensure the depth and width of the oil groove and the flatness of the upper plane, and then do Trailer Test. There is still oil leakage phenomenon, but the trailer time lasts a little longer, and the amount of oil leakage is obviously reduced.

2. in order to clearly see the oil leakage and the place of the oil pan, a cast iron plate (the material is the same as the machine seat) is machined in the workshop according to the method of machining base, and four screws holes are laid.

Add oil to the oil pan and cover the board. Tighten the four fastening screws evenly to the standard torque, make the oil pan upside down and sprinkle the child's talcum powder between the oil pan and the plate. After less than 5 minutes, the oil will leak out from the joint surface.

3. for further proof

The relationship between the planeness of the lower plane (big cast iron plate) and the knife marks and the oil leakage is also refined. The original plate is precisely grinded in the workshop, and there is still no oil leakage occurring after 24 hours of inversion.

This proves preliminarily that under the condition of certain oil seals, the width and depth of the oil tank, the flatness of the upper plane, the depth and smoothness of the lower plane of the machine are directly related to the oil penetration.

According to the results of the reference test and the design size of the oil pan of the imported high-speed sewing machine, we changed the width of the oil pan and the depth of the oil tank of the sewing machine, and correspondingly changed the sealing ring of the oil pan, and the flatness of the lower plane of the machine seat and the flatness of the upper surface of the oil pan were further changed, and the situation has greatly improved.

This condition lasted for a long time, and the oil pan was sealed well.

(two) recent tests and methods for oil leakage in oil pan

In 2002, the standard company continued to produce oil leakage between the oil pan and the machine in the batch production of the new high-speed sewing machine.

The main performance is that after 8 hours, there is oil leakage on the joint between the oil pan and the frame, or there is dripping oil on the head of the 4 fastening screws.

After finding this phenomenon at the scene, we took some measures temporarily, for example: (1) milling the oil pan around the steps and milling up a bit, increasing the pressing amount of the sealing ring of the oil pan; (2) fixing and padding the sealing ring of the oil pan with silicone rubber, increasing the pressing amount and preventing the oil leakage at the bottom of the oil pan; and reinstalling the oil pan again and again.

Solved a large part

Situation, but there are still about 3% to 5% of the oil pan can not completely solve the problem of oil leakage.