Collect some data and opinions of the roaster.

1. First of all, I feel that one of the most important aspects of the coffee machine is to solve the drum problem. The above picture first

The first one is an alp drum, which feels like it should stir evenly, but it's a lot of trouble for us to make it ourselves.

The second is the hottop drum, which feels good for small grams of baking, especially the middle chute can stir beans from the points, but also can solve the problem of beans.

The third one is the work of Taiwan's predecessors. This drum is very similar to the principle of cement mixer. It is more suitable for large baking machines. It feels that the workmanship is quite complicated.

The fourth one is the drum of huky300. This structure is relatively simple, and it is estimated that the beans will not be ideal. Simple stirring seems to be good.

If you make a 500kg baking machine, I personally feel that hottop's design should be the most practical.

The second problem that needs to be solved is heat.

I am disgusted with things like gas, because I can't find the feeling all the time, and sometimes I am afraid, hehe, so I gave up the idea (mainly because I saw that gas is too complicated and has no idea). The electric things are still relatively cold, and I think the electricity is still relatively clean, and the controllability is relatively high, the structure is relatively simple, and it is very suitable for small grams of baking machines.

Schematic diagram, previously seen on some sites useful pid, but think pid for constant temperature control is good, but for baking this need to adjust things is not suitable. This is the Taiwan version, so you need to install a transformer boost (Taiwan voltage standard is 110V). Here are some examples.

1.alp

2.hottop

For the choice of electric heating tube, I feel that infrared tube is more suitable, the electric radiation is more uniform, and the heat of small grams of coffee beans can be well controlled. I have seen a kind of quartz infrared heating tube on the Internet before, which should be very suitable. In fact, there is a simpler way to buy a simple small oven and directly use its heating unit (it seems that the cost will increase).

3. It should be a shell.

For the shell personal feeling should choose the kind of material with a certain thickness is more suitable, so conducive to the temperature climb, this does not have a picture, because they are barrels.

4. Motor

The role of the motor is mainly used to drive the rotation of the drum, and it seems that the rotation of the cooling plate is also driven by this motor. How to choose a lot of online, need to add a hysteresis device.

5, exhaust fan and dust collector

The main function is to extract silver skin and cool coffee beans, whether it is also to ensure the role of heat flow in the cavity is unknown.

I like the mini500 design very much. It's a professional machine method. I feel that even if I make a small machine, I have to do it small and complete.

Huky300 is relatively simple, but this is also a miniature of the principle of the mini500 and so on, and can effectively reduce costs.

6. Sampler and observation hole

Maybe I thought the temperature in the cavity was moderate, so I kept staring at the kind of glass used in boilers, but unfortunately I couldn't find a place to buy it at that time.

Sampling device I prefer that kind of axis sampling, but do not know where the truth lies, is not the axis should be the kind of outer bearing type, there are experts who know hope to show up to explain.

7. Cooling plate

This thing looks simple, but in fact, it feels very complicated. Moreover, how to drive and stir and how to walk the airflow path are all problems.

End, send a schematic diagram, I did not draw it, it is also downloaded online.

Finally, I hope there are experts in China who can make mini500 that kind of exquisite machine, of course, the price is king, haha.