Can anyone tell me about the structure of the plate and the structure of the volcano, respectively

The differences between membrane keyboards and mechanical keyboards are as follows:

1. Weight difference. The weight of the membrane keyboard is about 300g, and the mechanical keyboard mostly uses a steel plate structure, between 500g and 1000g;

2. Structural differences. Membrane keyboards are mostly waterproof and have drainage holes at the bottom. The mechanical keyboard is not waterproof and there is no drain hole at the bottom.

Mechanical keyboards feel better than membrane keyboards, so you can choose according to your needs.

Typical volcanoes include: volcanic cones, craters, and eruption vents.

Volcanic cones are accumulations of lava and pyroclastic deposits around vents;

A crater is a basin-shaped depression located above the vent at the top of the cone;

Ejecta vents are also known as volcanic passages or volcanic tubes.

Volcanoes are divided into craters, volcanic cones, and magma channels.

The crater erupts gaseous, liquid, and solid;

Volcanic cones are formed when magma erupted from a crater cools;

A magma channel is a passage through which magma erupts from the asthenosphere of the lower mantle, connecting the crater.

Volcanic canyons (roads), craters, volcanic cones.

Volcanic passages, craters, volcanic cones.

1.Structure of volcaniclastic rocks.

The most important feature of the volcaniclastic structure is that it is composed of pyroclastic structures, and it is generally divided into the following three types according to the size of the detrital particles (Fig. 2-40).

Aggregate structure: A structure composed of pyroclastic chips with a particle size greater than 64 mm (>50%).

Volcanic breccia structure: It is composed of 2 64 mm volcanic breccia with a content of more than 50% (Fig. 2-41).

Tuff structure: mainly composed of pyroclastic (volcanic ash) less than 2 mm.

a structure of the composition. Fused tuff structure is a special type of tuff structure, which is characterized by containing more plastic semi-plastic cuttings and glass cuttings. They are arranged in an orientation in the rock, and are flattened and elongated to appear like a flow structure, sometimes "flowing" around some rigid debris (Figure 2-42).

It is formed by the melting of volcanic ash from the heat of the Blazing Brother, which contains a lot of gas.

Figure 2-40 Schematic diagram of bomb (64 mm), lapilli (2 64 mm) and volcanic glass (2 mm).

According to Philpots Ague, 2009).

Figure 2-41 Sketch of volcanic breccia.

Hebei Temple, coarse noodles).

Figure 2-42 Sketch of rhyolite fused tuff.

Beijing Yanqing Xiaozhangjiakou).

According to Sun Shanping and Wang Xiaoming.

1964；Wang Suhua).

2.Structure of volcaniclastic rocks.

Volcaniclastic rocks are generally block-like structures, and some special limb structures can also be seen, such as rhyolite structures, bedding structures, etc.

Rhyolite structure: This is a structure formed by the directional arrangement of some plastic semi-plastic volcanic debris. The difference with the flow pattern structure is that the stripes in the flow pattern structure are discontinuous.

Bedding structure: This is a type of trending sedimentary rock that forms mainly in water basins.

A type of volcaniclastic rock (Fig. 2-43) formed by rhythmic alternating layers of detrital materials of varying thicknesses or compositions.

Figure 2-43 Sketch of tuff bedding structure (Luanping, Hebei Province.

According to Sun Shanping and Wang Xiaoming, 1964;Wang Suhua).

Magmatic rocks are formed by the cooling of volcanic magma, which are divided into intrusive and ejective types;

Sedimentary rocks are mainly sand, gravel, and mud deposits, which are formed by various erosions.

Metamorphic rocks are formed by various external forces such as extrusion and high temperature.

Connection: The three kinds of rocks can be converted into each other, magmatic rocks can become sedimentary rocks due to erosion and sedimentation, and they can also become metamorphic rocks due to extrusion and high temperature; Sedimentary rocks can be turned back into magmatic rocks due to deep penetration into the earth's crust, and they can also be squeezed and turned into metamorphic rocks by high temperatures. Metamorphic rocks can also penetrate deep into the earth's crust to become magmatic rocks, and can also be squeezed and turned into metamorphic rocks by high temperatures.

A kind of compaction consolidation.

of volcaniclastic rocks. It is mainly composed of volcanic breccia with a particle size of 2 64 mm, and also contains breccia of other rocks and a small amount of mineral crystals such as quartz and feldspar. Most of them have obvious edges and corners, poor sorting, and vary in size.

The gap filler is volcanic ash, volcanic dust. It is often associated with volcanic agglomerates and is located on the outside of the crater.

Some volcanic breccia contains a large amount of volcanic rock slag, the gravel is more angular, about 10 to 30 centimeters in diameter, the accumulation situation is not obvious, all of them are cemented by volcanic materials, and some of the agglomerates are tightly cemented, and there is no obvious boundary between the gravel and the cement, which is due to the fact that it has not yet melted when it is accumulated. There are many types of andesite of gravel, such as ordinary pyroxene, perilla pyroxene, and hornblende, which are commonly known as andesite agglomerates.

It is found in the Luanshan layer, the capital of the eastern coast mountain range of Taiwan, and its distribution area is slightly less than half of the coastal mountain range, and the most widely distributed place is in the middle of the mountain range, and then extends to the north and south. Part of this layer is composed of andesite gravel after panning in water, which represents the accumulation of volcaniclastic rocks after redeposition, and is not a direct eruption deposit of the volcano.

It takes time to get it right. There are very few people here who are willing to do such an exaggerated thing.

I don't think you need to express it on a diagram. Just tell the mold maker that the boss is going to be a crater! We've all done this before!

Reply: The 4th floor spends so much money for you to design a product, and it's not your responsibility to shrink when it comes out, just find out your boss. ;p

When the mold is restored to the factory to do the mold review, it is generally necessary to consider doing this thing, and there is no need to do the structure of the reminder, such as the mold dao design sense is not, and so the mold test thing has shrunk, just look for the mold factory design person to come out k, spend so much money for you to design a mold, this little problem can not be solved, k after the mold designer will find out his boss k.Anyway, I do the structure and mold them to be their customers.

The crater height is usually the top.

The thickness of the material is 1 3, not too high, there will be water ripples and shadows, the top of the volcanic crater is left to the platform, and the 45-degree oblique expansion is expanded. It has nothing to do with column height. Note that if the thickness of the column material is too thick and the top is too thin, it is useless to increase the crater, safety factor: ABS

For example, the thickness of the column or bone cannot exceed the top thickness of 2 3 (pp is 1 2), and note that on the large inclined plane, the 2 3 ratio is not applicable, because the column thickness is on the inclined plane, and the projection area is increased.

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