Why doesn't memcached return values ​​when running workers?

Question

Django

Short description: in django shell memcached returns values, but not in workers.
Detailed:
memcached and celery settings:

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '127.0.0.1:11211',
    }
}
CELERY_BROKER_URL = 'amqp://localhost'
CELERY_IGNORE_RESULT = True
CELERY_RESULT_BACKEND = 'cache+memcached://127.0.0.1:11211/'

I'm trying to cache calculations inside a class, it looks like this (nothing unusual, of course):

comp_article = cache.get(url.strip())
if not comp_article:
print('set cache')
comp_article = NewArticle(url=url.strip(), compare=True)
array = comp_article.img_array
title = comp_article.url_title
lang = comp_article.language
val = CacheArticle(array, title, lang)  
 #CacheArticle = namedtuple('CacheArticle', ['img_array', 'url_title', 'language'])
cache.set(url, val, 86400)

then in the virtual environment I start the django server, cache, worker and periodic task :

sudo service memcached start
celery -A anf_man beat -l info --scheduler django_celery_beat.schedulers:DatabaseScheduler
celery -A anf_man worker --concurrency=1 -l info

if you give the task manually without beat - it also does not cache
Help with ideas (ideas, maybe something to read and see in order to understand), what could be wrong, I can’t figure out where to dig, and Google will soon ban!