Direct to parts damage accident frequently accured in middle carrier of hydrological drill,by investigation and analysis,modifies three main parts and adding general utility coupling spring pin and rubber ring,that is to change rigid conjunction to elastic conjonction according to actual situation,which has achieved good result.

The article discussed application of new technologies in heat exchanger design practice, such as those on using rubber ring seal to strengthen the sealing between the heat exchanging tube and the tube-plate, using jacketed tube to strengthen the connection of the corrugated tube and the baffle, and using spiral flow to eliminate the dead zone.

Starting with the application of aprons,analysis is done to application of aprons regarding the main functions and the specifications.

Through allocation trial of variety specification of cots and aprons,ideal process plan is optimized for better spinning quality,consequently a good result.

Description is done that application of cots and aprons is a systematic engineering,part of the spinning process.

Using Management Experiences of Top Roller and Apron of Imported Spinning Equipment;

Speciality and Spinning Test of JF Spinning Double Short Apron Draft Form;

Practice on Spinning C 9.7 tex with Soft Elastic Top Roller and Apron;