I used to be in that business 40 years ago. The company is long gone, but I can’t imagine their competitors are all gone. Search for the term “tunnel washer”, but you’ll have to wade through all the versions that are for commercial laundries.
Or are you thinking of doing this from scratch? I wouldn’t recommend it unless you are VERY familiar with all of the myriad health codes involved, ie water temperature, contact time, detergent regulations, residue limits etc etc etc. It’s a lot more complex than most people imagine.
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden