Design / Mechanical Design.
Valve stem packing elastic seal, stem use disc spring, compression spring to achieve packing long-term seal

Valve stem seal generally used packing seal, packing by compaction to achieve sealing. Common fillers are graphite, PTFE V-rings, etc.

1. Add belleville spring at packing gland to realize continuous sealing

As shown in No. 7 of the following figure, 2 belleville spring are added above the packing gland.

Valve stem packing elastic seal, stem use disc spring, compression spring to achieve packing long-term seal

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CNC machine tool fixture design case

CNC machine tool fixture design case

Machining automation production involves the tooling fixture of the machine tool, the requirements meet the automatic clamping, reduce the accumulation of iron filings, the following is the commonly used fixture design cases of machine tools, looking forward to bringing you some design inspiration.

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principle of the hydraulic shank clamping tool, relying on the deformation of the shell caused by hydraulic oil to achieve clamping loosening

The principle of hydraulic tool holder is to use two concentric cylinders of inflatable shafts, seal the two ends to form a cylindrical cavity, fill one of the cylinders with hydraulic oil, and apply a certain pressure to the oil, and this pressure will be transmitted to each part of the oil cavity with equal values. The outer wall of these two concentric cylinders is thin, and after pressure, it will expand outward, according to this deformed thin wall, the expansion clamping of the inner hole and the expansion clamping of the outer diameter can be realized. At this time, the thin wall is actually evenly subjected to oil pressure in every place, so after the inner hole and outer diameter of the part are tightened, its clamping accuracy will be very high, and the hydraulic tool holder is developed according to this principle and successfully applied to the CNC machining manufacturing industry.

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Can wire ropes also absorb shocks and cushion? Japan has made it a standard product

Wire rope can be seen everywhere, such as winches, cranes, etc. have wire rope, I remember that the wire rope is used as a rope, can only withstand tensile force, did not expect that Japanese wire rope can also be made into shock absorbers. 

Two days ago, someone left me a message, recommended a professional shock absorber Japanese manufacturer, just had time to go to the company's official website to see, did find, in addition to our common oil pressure buffer, nitrogen gas spring, but also found a spiral wire rope shock absorber buffer.

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How ingenious! Have you ever seen an angle magnification mechanism? Excavators also have universities asked

Obviously I learned it, why didn't I think of it?

In these two days, a turning mechanism was designed, driven by a cylinder, and the flipping angle was about 120°. Although the scheme is feasible, but the specific design found that the stroke of the cylinder is particularly long, the limit position force is not good, just when I was at a loss, I suddenly found that there is a ready-made angle amplification mechanism on the excavator, but I did not expect that the excavator is also very knowledgeable.

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After 15 years of drawing, using curve arrays for the first time, SolidWorks was so powerful that I couldn

Call me a rookie, but I've been drawing diagrams for 15 years, I'm a master, but for the first time I used curves to drive an entire column of parts. I have been drawing pictures for more than ten years, but it seems that I have been drawing tofu blocks all the time.

In the past two days, a three-dimensional model of a harmonic reducer has been drawn, see → harmonic reducer 3D model , in which the wave generator has a bearing is oval, so the balls in the bearing should also be arranged into an oval shape, I thought that the oval arrangement was not easy to draw, but I didn't expect SolidWorks to get it with one click.

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Bad reviews! I don

Free is not good, and so is CAD software.

LibreCAD is a free Open Source CAD application for Windows, Apple and Linux. Support and documentation are free from our large, dedicated community of users, contributors and developers.

The LibreCAD installation package is only 24M, compared to the AutoCAD 2G installation package, LibreCAD is small, but the corresponding features and user experience, LibreCAD has also plummeted.

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