Zonglan continues to be respected as an innovative eyelet machine designer, brass eyelet manufacturer and exporter.
We are proud to serve major regions of the world – particularly Europe, America and Oceania – through our distributors. Zonglan currently boasts tens of thousands of grommet machines that continue to serve our worldwide users in various industries, including sign and digital printing, draperies, aerospace, maritime industries, textiles, and more.
Zonglan gives utmost importance to Research & Development (R&D). We continue to focus and work on developing new products on a daily basis to contribute to rising industry standards, as well as on producing innovations that increase efficiency for our customers.
While our engineers work on developing smart grommet-attaching machines and use the latest technology to enable Zonglan products to be the best available, our molding department also works on producing new styles or sizes of grommets and eyelets in keeping with customer & market requirements.
It is a well-known fact that achieving impeccable results requires not only qualified grommets and machines but also that the grommet and machine match each other perfectly. In this respect, Zonglan is a total solution provider for grommet/eyelet attaching in view of its proficiency developing both the machines and the grommets/eyelets to work in flawless harmony.
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If the bolt break is located in the wire hole, if the diameter of the broken wire is small, the electrode with the appropriate thickness can be selected.
If the bolt is rusted and cannot be removed using a screw loosening agent or a hand hammer, consider applying more rotational force. For example, you can use a long lever bar or a 20-pound hammer to shake the wrench handle (the bolt may be stuck in the thread hole). If the bolt breaks and part of it is exposed outside the thread hole, use a pipe wrench to grip the exposed section and pull it out slightly. Then, turn it off with a wrench. Alternatively, weld a nut onto the broken section and try to rotate and remove it. If the broken bolt is inside the thread hole, and the diameter of the broken portion is small, select an electrode of appropriate thickness and weld it directly to the bolt section. Bend the exposed part of the electrode and then rotate it to test for removal. Another option is to weld a thin, long rod onto the broken section and turn the bolt from all six sides to attempt disassembly.
Welding repairs for mine parts typically involve manual arc welding, which requires strict process control. Every step—starting the arc, welding, and ending the arc—must follow specific procedures, especially when welding motor shafts, where the requirements are even more stringent. Any welding defects, such as cracks or porosity, could create weak points that affect the performance of the motor shaft. Therefore, after selecting the right welding rod, welding machine, and current, it's essential to plan the welding sequence carefully. Symmetrical interval welding is required; once welding is done around the shaft, welding should also be performed at symmetrical positions to minimize distortion caused by heat. During the welding process, ensure proper heat retention and avoid forced cooling. Clean the welding slag promptly to reduce the risk of slag inclusion. After welding, the motor shaft should be machined to meet actual usage requirements, and the surfacing area must be properly machined to satisfy mechanical fit specifications.