Maxim number query about a website from a speficic computer

Hi all,

I use Mechanize and Hprioct to submit repeated queries to a website of
interest about 100-200 times, download some small files, parse the
pages, and save them. But after fecthing 35 pages the process stops. It
looks like the website only permits a limit number of access from a
specific machine/PC. Is it possible to know the maxim number of query
for website?