To adjust the needle bed of a Tricot warp knitting machine, the fabric type, raw material characteristics, and equipment performance must be considered comprehensively. The following are the key adjustment points and optimization directions:
Needle bed spacing: matching yarn thickness
Fine yarn (such as polyester low-elastic yarn): set the spacing to 0.05~0.2mm to ensure tight coils.
Coarse yarn (such as nylon yarn): relax the spacing to 0.2~0.5mm to avoid extrusion and yarn breakage.
Adjustment tool: use screw/hydraulic device for fine adjustment, and calibrate the left and right error of the micrometer to ≤0.01mm.
Needle bed height: Align the loop forming parts
Loop forming stage: when the needle bed is at the highest position, the needle head is 0.1~0.3mm lower than the jaw of the sinker to prevent the old coil from being unhooked in advance.
Yarn padding stage: When the needle bed is at the low position, the knitting needle hook tip is aligned with the center of the yarn guide needle hole (deviation ≤0.05mm) to ensure that the yarn is accurately hooked.
Dynamic verification: observe the yarn padding angle at a slow speed, and it is better to stabilize at 30°~45°.
Parallelism and verticality: ensure uniformity
Horizontal parallelism: laser level instrument detects left and right height difference ≤0.02mm/m to avoid uneven horizontal density.
Longitudinal parallelism: feeler gauge checks the rail gap 0.01~0.03mm, and replaces the worn rail in time.
Verticality: square ruler calibrates the needle bed and sinker bed vertically, and adjusts the anchor bolts when the deviation is >0.05mm/m.
Quick adaptation for special scenarios
Elastic fabric: reduce the spacing by 0.03~0.05mm, move the sinker forward by 0.1~0.2mm, and enhance the grip.
High-speed production: increase the spacing between the needle bed and the comb bar by 0.05~0.1mm, and strengthen the bolt torque to 8~12N•m to prevent vibration displacement.
Adjustment verification and maintenance
Trial weaving inspection: measure the longitudinal/transverse density (deviation ≤±2%) and strength of the first piece, and the hole needs to be readjusted.
Daily maintenance: check the guide rail lubrication every 8 hours, clean the needle bed surface every month to prevent fiber accumulation from affecting the accuracy.
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