DZL series package boilers are horizontal three-pass water & fire tube boilers with a chain grate stoker structure. Threaded pyrotechnic tubes are arranged in the drum to form a convection heating surface, while the drum and the water walls on both sides form a radiation heating surface in the furnace. Each package system is fully installed and wired before being transported to site and is electrically controlled to provide functions such as stepless speed regulation for the stoker, threshold parameter alert and interlock protection. WUXI ZOZEN BOILERS CO.,LTD. , https://www.cnzozen.com
The needle plate and the feed dog of the medium speed sewing machine are double-rowed, and the rear half is subjected to a large force. The operator can easily inject the needle when using the sewing machine with the inverted feed wrench for the reverse feeding operation. If there is an injection, the needle plate collapses; and with a good quality needle plate, the needle plate collapses.
Inspection method: Put it into the feeding socket of the needle plate with a screwdriver, and shake it from side to side, and carefully observe whether it is deformed by force, such as deformation or inferior quality.
Presser foot
Test method: Use a pair of pliers to clamp the presser foot to see if the print can be clipped. The hardened presser foot is not clipped. (The quality of the needle plate, presser foot and feed dog of the domestic standard brand GC6-1 type high level machine is good. The 12481 feed screw fastening screw made in Taiwan has TAIWAN printing and 12481 Arabic numerals in the middle of the two holes. This product is sturdy. Durable, the tip of the feed tip is not prone to slipping).
Needle
High-speed double-section silver-white nickel-plated needles should be used. Because most enterprises use high-speed machines, many sewing products are new waterproof materials and chemical synthetic fiber materials. Therefore, the needles must be resistant to high temperatures. Generally, the chrome-plated needles are not suitable. Even if they are available, the effect is not satisfactory. Japanese piano needles and Korean and Japanese piano companies have a good quality, smooth surface and long service life.
Needle plate and feed dog