Problem with conveyor side transfers

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Anatole asked May 31, '24 Anatole published Jun 10, '24

Problem with conveyor side transfers

Hello,

I have an issue with side transfers of conveyors, an item can either go to the right or the left, and when it goes to the left, the item does a "jump" before arriving in the second conveyor.

conveyor_crossing_1.fsm

I looked at the conveyor points and I didn't see anything strange, am I misunderstanding the behaviour of these transfers ? Or is there a bug ?

Like this it looks like to be only visual error, but I actually have this issue in a much bigger model, and this error causes some bugs on the whole conveyor system.

Thanks,

Software Version:

FlexSim 24.0.3

conveyorsystem side transfer crossing

crossing-pb.png (147.2 KiB)

conveyor-crossing-1.fsm (41.4 KiB)

· 1

5 |100000

Attachments: Up to 12 attachments (including images) can be used with a maximum of 23.8 MiB each and 47.7 MiB total.

Logan Gold ♦♦ commented · Jun 10 at 03:17 PM

Hi @Anatole, was Felix Möhlmann's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always comment back to reopen your question.

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Answer 1 · 2024-06-03T08:18:39Z

Felix Möhlmann answered Jun 3, '24 Anatole published Jun 10, '24

Conveyors aren't really designed to be overlapped like this. The intersection should either be build by having the horizontal conveyors connect to the sides of the vertical one.

Or by using a small conveyor in the middle whose direction you change when needed.

The second case needs control logic to make sure that items with different destinations cannot enter the intersection at the same time. For the first case this is optional but can potentially come close to how the intersection would operator in reality.

conveyor-crossing-1.fsm

conveyor-crossing-2.fsm

capture1.png (117.1 KiB)

capture2.png (120.8 KiB)

conveyor-crossing-1.fsm (41.4 KiB)

conveyor-crossing-2.fsm (46.8 KiB)

· 1

5 |100000

Attachments: Up to 12 attachments (including images) can be used with a maximum of 23.8 MiB each and 47.7 MiB total.

Anatole commented · Jun 10 at 04:03 PM

Thank you for this answer, I changed the conveyor crossing and it works now.

I also think I actually found the reason why my bigger model was bugging.

In the same crossing, if I have acceleration and deceleration superior to 0, the box get stuck and is not able to transfer to the other conveyor :

Is this normal ?

Should the acceleration and decelaration always be equal to 0 ?

Thanks,

conveyor_crossing_w_pb_acceleration.fsm

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conveyor-crossing-w-pb-acceleration.fsm (47.9 KiB)

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