Can Ab benches/ workouts help you lose weight?

I work out two times a week at a gym with my soccer team, doing cardio, sprints, weight liting etc. but on my off days (the other 5 days lol) i would like to workout by myself becuase i need to lose about 30 pounds. If i buy one of those ab crunch lounge things do you think it could help?? If not what should i do. I want to buy some kind of equipment, not too expensive!, to help me at home! HELP PLEASE.