Wool roll constant-pressure device of papermaking felt needling combination machine

The utility model discloses a wool roll constant-pressure device of a papermaking felt needling combination machine, and belongs to the technical field of non-textile machinery. The outer sleeve is fixed with the needling machine, and a limiting contact piece fixing bolt sliding groove is formed in the wall body of the outer sleeve; the lifting inner sleeve is matched with the outer sleeve cavity, and a limiting block sliding fit groove is formed in the outer wall of the lifting inner sleeve; the inner sleeve lifting limit position signal triggering mechanism is fixed with the lower end of the lifting inner sleeve; the inner sleeve lifting upper limit position signal acquisition mechanism and the inner sleeve lifting lower limit position signal acquisition mechanism are fixed with the outer wall of the outer sleeve; the inner sleeve lifting executing mechanism is arranged in the outer sleeve cavity and is connected with the lower end of the lifting inner sleeve; the power mechanism is fixed with the lower end