What factors need to be considered in the design of textile equipment warp stop strips
As the core component of the warp stop device on textile looms, the design of the warp stop strip needs to adapt to the operation, weaving process, and complex production environment of the loom, while meeting the requirements of detection accuracy and durability. The specific design considerations are as follows:
As the core component of the warp stop device on textile looms, the design of the warp stop strip needs to adapt to the operation, weaving process, and complex production environment of the loom, while meeting the requirements of detection accuracy and durability. The specific design considerations are as follows:
1. Specification parameters for adapting weaving processes
Size and column matching: The length needs to fit the reed width of different looms, and the commonly adapted width covers various specifications such as 1250-4600mm. The length tolerance should be controlled, for example, the length tolerance of the 1200mm stop bar should meet the standard of ± 1.0mm to avoid installation misalignment. The design of the number of columns should correspond to the type of weaving machine. For shuttle weaving machines, four columns are commonly used, while for non shuttle weaving machines, six or eight columns are often used. For high warp density fabrics, increasing the number of columns can also avoid motion lag caused by overly dense arrangement of warp stopping pieces. In addition, its cross-section should match the groove of the stop plate to ensure smooth adhesion between the two.
Weight and thickness adaptation: It needs to be adjusted based on the warp yarn count and weaving machine speed. When the warp yarn count is large and the speed is fast, the adapted warp stopping strip and matching warp stopping piece need to be slightly heavier to ensure sensitive falling action when the warp is broken; When weaving fine yarn, thinner and lighter specifications can be used to reduce the pulling of fragile warp yarns. The commonly used stop warp sheet in cotton production is matched with a stop warp strip, and its related components have a thickness of about 0.2-0.3mm, which can ensure a reasonable arrangement density.
2. Ensure correct performance design for testing
Optimization of conductivity performance: Electronic stop strips must have stable conductivity performance. For example, GB/T38417-2019 stipulates that their resistivity at 20 ℃ should not exceed 1.7 × 10 ⁻⁸Ω· m, and their contact resistance should not exceed 50m Ω, in order to ensure stable transmission of current signals during break through and avoid false alarms or omissions. During design, excellent conductive materials such as brass can be selected, while optimizing the interface structure to reduce attenuation during signal transmission.
Sensitivity adaptation: By controlling the dimensional tolerance, the detection sensitivity is guaranteed. For example, the diameter tolerance of a 6mm stop bar should be controlled within ± 0.03mm, and the straightness tolerance should not exceed 0.05mm/m to prevent interference with the detection signal due to unstable gaps or high-speed running shaking. For fabric weaving, a positioning feedback structure can also be used to achieve correct positioning of the warp break point.
3. Structural and material selection suitable for working conditions
Material strength and wear resistance: Materials with tensile strength and hardness standards should be selected. The tensile strength of stainless steel stop warp strips is usually not less than 520MPa, and the tensile strength of brass materials is not less than 300MPa to avoid deformation and bending after hanging stop warp strips. The surface needs to be coated to ensure smoothness and reduce friction loss with the stop plate, while also improving wear resistance and preventing grooves from affecting contact accuracy during long-term use.
Environmental corrosion resistance design: There are issues such as humidity fluctuations and residual chemical additives in the textile workshop, and the design needs to meet the requirements of temperature resistance of -20 ℃ -80 ℃ and adapt to the temperature difference between the north and south workshops; At the same time, a 48 hour neutral salt spray test must be conducted to ensure that the surface corrosion area does not exceed 5%. For wet environments such as water jet looms, it is necessary to strengthen the moisture-proof structure to avoid moisture and corrosion that may affect conductivity and structural stability.
4. Installation and operational stability of compatible devices
Structural stiffness guarantee: The overall structure needs to have sufficient stiffness, and there will be no significant deformation after hanging the warp stopper. Otherwise, it will cause the movement of the warp stopper to be obstructed, affecting the timeliness of the broken warp detection. During design, the cross-sectional structure of the rod can be optimized by using solid or high-strength hollow structures, balancing lightweight and deformation resistance.
Compatibility and assembly: The size needs to be adapted to different models, such as rapier looms and air-jet looms, all of which have corresponding compatible models. The interface size needs to be standardized to avoid the problem of products from different manufacturers being unable to be used interchangeably. At the same time, the installation structure should be simple, convenient for correct docking with the stop frame, and the electrical connection parts should be designed to be stable to prevent poor contact caused by vibration during operation.
5. Detail design to extend service life
Protective structure setting: Electronic stop strips need to have insulation layer design to prevent insulation aging from causing short circuits or misoperations. The insulation layer should withstand friction and environmental erosion during long-term use. Key transmission and connection parts can adopt sealed structures to prevent dust and water vapor from entering the interior and affecting the service life of components.
Consideration of maintainability: Modular structure can be adopted in the design to facilitate the replacement of damaged parts in the later stage; The surface coating should be made of materials that are not easily peeled off, reducing frequent replacement due to friction loss and lowering maintenance costs for the enterprise.
Home
Product
Wechat
Telephone