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How to support and fix the stop frame seat

Source：www.cscx88.com Release date： 2025-10-09

The warp stop stand is a core support component used in textile machinery, such as water jet looms, air-jet looms, and rapier looms, to install the "warp stop piece". The stability of its support and fixation directly affects the sensitivity of the warp stop device (detecting warp yarn breakage) and the operating accuracy of the loom. Reliable support should be achieved through a combination of "rigid fixation+correct positioning+anti vibration buffering" based on the weaving machine model, stop frame structure (single/multiple rows, fixed/adjustable), and force characteristics. The specific plan is as follows:
1、 Core support fixed principle: matching the working conditions and requirements of the weaving machine
The warp stopping frame seat needs to withstand two types of forces during the operation of the loom: one is the lateral tension between the gravity of the warp stopping piece itself and the warp tension (about 5-15N/piece, and the total tension can reach several hundred newtons in multiple rows); The second is the high-frequency vibration (amplitude 0.1-0.5mm) generated by the high-speed operation of the loom (usually 400-1000 revolutions per minute). Therefore, the support and fixation must meet three major principles:
Sufficient rigidity: to avoid bending or displacement of the warp stop frame after being subjected to force, ensuring stable relative position between the warp stop piece and the warp yarn;
Correct positioning: The installation position of the warp stop bracket should match the accuracy of the warp yarn arrangement (positioning error ≤ 0.2mm) to prevent detection failure caused by misalignment between the warp yarn and the warp stop piece;
Anti vibration and anti loosening: By using an anti loosening structure, the fixed parts (bolts, nuts) are prevented from loosening due to vibration, while reducing the transmission of vibration to the stopping device.
2、 Supporting and fixing schemes based on structural types
The structure of the warp stop frame of different looms varies greatly, and the mainstream is divided into "integrated fixed seat" and "split adjustable seat". The support and fixing scheme needs to be designed specifically:
1. Integrated stop frame seat: rigidly fixed directly (suitable for small and medium-sized weaving machines/single row stop devices)
The integrated stop frame seat is usually a cast part (mostly made of gray cast iron HT200 or ductile iron QT450, with strong rigidity and low cost), directly connected to the loom frame. The support and fixing method is simple and reliable. Specific steps:
Step 1: Reference positioning and pre fixation are based on the "warp yarn guide roller axis" or "comprehensive frame guide rail plane" of the loom. The "positioning pin holes" (usually 2-4, with a hole diameter tolerance of H7) at the bottom of the seat are matched with the positioning pins on the frame to achieve preliminary positioning (positioning error ≤ 0.1mm); At the same time, use a "coarse tooth bolt" (M10-M16, made of 8.8 grade high-strength steel) to pass through the waist shaped fixing hole of the seat body (for easy adjustment of position), and pre tighten to 50% -70% of the rated torque (such as M12 bolt pre tightening torque 15-20N · m).
Step 2: Correct adjustment and final fixation. Use a "dial gauge" or "laser locator" to detect the key reference plane of the stop frame seat (such as the upper plane of the stop plate installation groove):
Flatness: It should be ≤ 0.1mm/m (measured along the length direction of the seat with a dial gauge to avoid bending);
Parallelism: The parallelism with the axis of the warp guide roller is ≤ 0.2mm/m (ensuring that the warp passes vertically through the warp stop plate);
After adjustment, tighten the fixing bolts to the rated torque (such as the final tightening torque of 25-30N · m for M12 bolts), and use "double nut anti loosening" or "bolt tail spot welding anti loosening" (to avoid vibration loosening).
Step 3: Auxiliary rigidity reinforcement (optional, for multi row stop frames) If the length of the integrated seat body exceeds 1.5m (such as multi row stop frames), an "auxiliary support block" (made of the same material as the seat body, with a thickness of 10-15mm) needs to be added in the middle of the seat body. One end of the support block is welded to the seat body (fully welded, with a welding foot height of 5-8mm), and the other end is fixed to the frame with bolts to prevent the middle of the seat body from sagging due to its own weight or force (the sagging amount should be controlled within ≤ 0.05mm).
2. Split type adjustable warp stop frame seat: flexible positioning+rigid locking (suitable for large weaving machines/multi-color weft weaving machines)
The split type seat body consists of a "base+movable frame+adjustment mechanism" (the movable frame can slide along the base to achieve fine adjustment of the stopping position), and the support and fixation need to balance "adjustability" and "stability". The core solution is:
The rigid fixed base of the base (usually a welded steel plate with a thickness of 12-16mm) is rigidly connected to the loom frame (made of Q235 or cast steel) through "4-6 high-strength bolts" (M12-M20, grade 10.9), and the bolt holes are "transitional fit" (base hole H8, frame hole H7). During installation, "spring washers" (anti vibration) and "flat washers" are added between the bolts and the base (to increase the stress area and avoid base deformation); The contact surface between the base and the frame needs to be "milled flat" (surface roughness Ra ≤ 3.2 μ m) to ensure a tight fit (gap ≤ 0.05mm) and reduce vibration transmission.
The adjustable positioning and locking of the movable frame (the core component for installing the stop plate, made of aluminum alloy or cast iron) is matched with the base through a "linear guide rail" (precision level H) for sliding, and the support and fixation need to be divided into two steps:
Fine tuning positioning: Use the "adjustment screw" (M8-M12, with locking nut) on the side of the base to push the movable frame and adjust it to the target position (positioning accuracy ± 0.05mm). During the adjustment process, use a "micrometer" to check the distance between the movable frame and the warp reference line;
Rigid locking: After positioning is completed, use "locking bolts" (usually 4-8, M6-M10) to lock the movable frame and linear guide slider. The locking torque should be uniform (such as M8 bolt torque 8-10N · m) to avoid deformation of the movable frame due to uneven locking force; Some models will install an "electromagnetic locking device" at the bottom of the movable frame to further prevent slight displacement caused by vibration.
The anti vibration buffer design requires the installation of a "rubber buffer pad" (thickness 2-3mm, hardness 50-60 Shore A) between the movable frame and the base of the split type seat, or the installation of a "spring buffer structure" at the adjusting screw to absorb weaving machine vibration (reduce vibration transmission rate by 30% -50%), and avoid "false detection" (such as false breakage signal) of the warp stop due to high-frequency vibration.
3、 Strengthening support fixation for special working conditions (high temperature/high humidity/high vibration weaving machines)
In chemical fiber weaving (high temperature environment, 40-60 ℃), water jet weaving (high humidity environment, relative humidity 80% -90%) or high-speed weaving (speed>1000 revolutions per minute), the support and fixation of the stop frame need to be additionally strengthened:
Corrosion resistant reinforced fasteners (bolts, nuts, locating pins) are made of "stainless steel material" (such as 304 or 316, corrosion-resistant), and the surface of the seat is coated with "electrophoretic coating" or "galvanizing treatment" (coating thickness 8-12 μ m) to avoid corrosion caused by high humidity environments; Apply "rust proof sealant" (such as silicone sealant) to the contact surface between the base and the rack to isolate moisture from entering.
High temperature anti deformation strengthening adopts a "heat-resistant material seat body" (such as cast steel ZG230-450, which has better high-temperature resistance than cast iron), and the fixing bolts are made of "high-temperature high-strength steel" (such as 12.9 grade high-temperature alloy bolts), and "high-temperature anti seize agent" is applied to the bolt threads to prevent the bolt and nut from biting under high temperature; Reserve a "thermal expansion gap" during installation (such as 0.5-1mm gap per meter in the length direction of the seat) to prevent the seat from expanding and deforming due to high temperature.
The high vibration anti loosening strengthening fixing bolt adopts "Shibiluo thread" (with better anti loosening effect than ordinary thread) or "thread glue locking" (such as Loctite 243 medium strength thread glue, which can be disassembled and anti loosening); Install a "vibration damper" (such as a rubber damping block or metal spring damper) on the top of the suspension stand to absorb high-frequency vibrations (amplitude can be reduced to below 0.05mm).
4、 Post installation testing and maintenance: ensure long-term stable support
After the suspension bracket is fixed, it needs to undergo strict testing and regular maintenance to avoid failure after long-term operation:
Installation testing
Use a "coordinate measuring instrument" to check the key dimensions of the seat body (such as the position and parallelism of the mounting groove of the stop plate), with an error of ≤ 0.1mm;
Perform a "vibration test": the loom runs idle for 30 minutes, using a vibration sensor to detect the amplitude of the seat (≤ 0.1mm), while observing whether the warp stop device gives a false alarm;
Perform a "tension test": Under normal tension of the warp yarn (such as 20-30cN/piece), check whether the seat body has obvious deformation (using a dial gauge to detect deformation ≤ 0.03mm).
regular maintenance
Check the torque of fixed bolts weekly (tighten with a torque wrench, and re tighten if the torque attenuation exceeds 10%);
Clean the mating surface between the base and the movable frame every month, remove dust and lint, and avoid affecting sliding adjustment;
Replace the rubber cushion every quarter (if aged or deformed) and reapply thread locking glue or rust inhibitor.

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