The yarn doubling machine is a core equipment used in the textile industry to improve the physical properties of yarn. Through special mechanical design, the yarn obtains double twist, significantly enhancing its strength, elasticity, and wear resistance. The following will explain the working principle and usage details.
1、 Working principle: Mechanical logic of double twisting
The core of the yarn doubling machine lies in the innovative design of "two reverse twists". The main structure includes a spindle system, a dragon belt transmission device, a false twisting device, and a winding mechanism. When working, one end of the yarn is fixed at the top of the high-speed rotating spindle, and the first twisting is completed synchronously with the spindle rotation; Subsequently, the yarn is subjected to a specially designed false twisting device (usually a ceramic guide wire hook), which generates reverse secondary twisting due to frictional force. Two twists in opposite directions and overlapping, ultimately forming a stable structure with double twist.
This process relies on precise transmission ratio control: the main motor drives the dragon belt to drive the spindle to run at high speed, while the speed of the false twisting device is slightly lower than the spindle speed, forming a relative differential to achieve reverse twisting. At the same time, the tension control system dynamically adjusts the yarn tension through pneumatic or magnetic powder brakes to ensure uniform force distribution during the twisting process and avoid breakage or loosening.
Compared to traditional single twisting machines, double twisting technology can increase the twist coefficient to more than 2 times in the same time, especially suitable for the production of high count fine yarns, effectively improving fabric feel and durability.
2、 Details of use: key elements of precise control
1. Preparation before startup
-Equipment inspection: Confirm that the power supply voltage is stable and that all transmission belts are not loose or broken; Clean the residual fibers of the ingot wing to prevent entanglement from affecting the rotational speed.
-Process setting: Adjust the spindle speed, overfeed rate (front and rear roller ratio), and tension parameters based on the yarn raw materials (cotton/synthetic fiber/blend) and target twist. For example, pure cotton yarn requires lower tension to avoid brittle breakage, while polyester filament can be appropriately increased.
-Thread guide path: Follow the sequence of "air coil → yarn guide hook → false twisting device → winding disc" to standardize the routing, ensuring smooth and non crossing friction of the yarn path.
2. Running operations
-Start sequence: First, test run at low speed and observe whether the shape of the gas ring is stably distributed in a conical shape; Gradually accelerate to the process speed and monitor the fluctuation range of the ammeter (normally ≤ 10%).
-Exception handling: Immediately press the emergency stop button when a decapitation occurs, and investigate the cause (such as excessive hairiness or sudden increase in tension); Frequent breakage requires checking the wear of the yarn guide components.
-Timing of tube dropping: When the full tube indicator light is on, slowly reduce the speed and unwind to avoid forcibly tearing and causing untwisting.
3. Shutdown maintenance
-Daily maintenance: Clean the flying flowers in the ingot tank every shift, and replenish lubricating grease to the gearbox every week; Calibrate the sensitivity of the tension sensor monthly.
-Replacement of vulnerable parts: If there are grooves in the ceramic pieces of the false twisting device, they need to be replaced in a timely manner, otherwise it will cause yarn fuzzing; When the surface of the dragon belt cracks, it must be completely renewed to prevent transmission slippage.
4. Safety regulations
-It is strictly prohibited to operate high-speed rotating parts with gloves, and long hair must be tied into a work cap;
-When adjusting tension, stand sideways to avoid the trajectory of yarn breakage;
-Cut off the main power supply before maintenance and hang a warning sign on the control cabinet.
The efficient operation of yarn doubling machines relies on a deep understanding of mechanical principles and refined operations. By strictly controlling process parameters, standardizing operating procedures, and implementing daily maintenance, the potential of equipment can be fully utilized to produce high-quality double twisted yarns that meet the needs of textiles. In practical operation, it is necessary to combine specific machine manuals and flexibly adjust parameter combinations in order to achieve optimal economic benefits.