Dongguan ZORON Machinery Co., Ltd.'s professional after-sale services team will provide you perfect technical support. Welcome to visit our factory! The Leading Manufacturer in the Manufacturing Machinery Industry, Mainly Producing automatic cutting machine Dongguan Zuolong Machinery Co., Ltd.'s sewing machine has the following advantages over other similar products. According to different needs of customers, Zuolong Machinery is capable of providing reasonable, comprehensive and optimal solutions for customers.

Production Principle of steel bar straight thread connecting sleeve? (JSGF02-The steel bar and other strong threaded joints (rolling) are suitable for all concrete structural projects with earthquake resistance and non-seismic forgery,It is especially suitable for important structures that require full play to the strength and toughness of steel bars.1.1 thick diameter, different diameter steel bar connection.1.2 bending steel bar, super long horizontal steel bar connection.1.3 Steel Cage docking.1.4 docking between two fixed steel bars.1.5 steel structure and steel bar connection.When the steel column intersects with the main reinforcement of the beam,The nut welded on the steel plate can be used to connect the steel bars.The principle of straight thread connection for steel bar and other strong rolling is: Press the end part of the steel bar round through the roller and roll out the steel bar mechanical joint formed by the thread connection

How many years of knitting history? In ancient times,Our ancestors learned to sew simple clothes such as animal skin and leaves with fishbone needles and stone needles,With the development of iron and metal manufacturing technology,People gradually learned to use metal needles to sew clothes,The shape has also been greatly improved,And has been used so far.The earliest sewing machine was to sew cloth or leather with single, double and multiple wires and machine needles,Or sew a machine with decorative thread marks on the seam material.For home, industrial and service companies.After the mid-18th century industrial revolution,The large-scale production of the textile industry has promoted the invention and development of sewing machines.1790,Britain first invented the world's first single-line chain thread sewing machine for punching holes, threading and sewing shoes.1841,The French invented a chain thread sewing machine with a hook.1851,American worker I.M.The winner invented the locking thread se