What hardware and software is required to scan a large number of formalized documents?

Question

Scanning

Hello.
It is required to solve the problem:
1. There is a large number of formalized documents in paper form (questionnaire, in the necessary squares there is some sign - a cross, a tick, etc.).
2. You need to scan all the documents and create a database of what answers are in the questionnaires.
I ask for help in the following points:
1. What equipment is required (any industrial scanners with automatic paper feed)? Also interested in the possibility of buying it in Russia. I would be grateful for the correct name of such equipment and specific models.
2. What software is required?
Thanks
Added:
The number of approximately 20 thousand questionnaires. It needs to be processed within a day or two after receipt. These are monitoring studies in the field of education. Periodicity - several times a year - therefore the equipment is required for permanent use.

Answer 1

Indistinct statement of the task.
A large number is how much?
How long does it need to be done?
Is it a one-time job or a permanent one?
Depending on the answers, the equipment depends - from an office MFP with an automatic feeder to an ultra-fast "industrial" one, as you say. The services of a copy center are possible, at one of the exhibitions the company offered its services for digitization - a team arrives with its equipment and does everything.