GA type flexible rapier loom
The GA747 flexible rapier loom is a popular rapier loom independently developed and manufactured by China Textile Machinery Co., Ltd. that is suitable for national conditions. Scope of application and fabric types: This machine is suitable for weaving fabrics made of cotton, linen, chemical fiber and silk spinning yarns as raw materials. It can especially weave medium-thick plain weave, low-elastic filament, ultra-fine chemical fiber laminate yarn, etc. Twill, satin and other dobby fabrics. The product has strong adaptability and can meet the needs of weaving cotton yarn (58~9.5tex) or chemical fiber (85~520dtex) fabrics with a weft density of 75~400 threads/10cm, and the fabric weight can reach 450g/m2. The machine frame takes into account the large size Maximize the use of shuttle loom parts to facilitate the modification of old machines. This machine adopts the wall panels and braces of shuttle looms. The breast beam is reinforced with several diagonal braces to adapt to the weaving of heavy fabrics. In order to make the dobby device stable It is ground-mounted on the rack, and the upper beam adopts a channel steel structure. The entire rack is both stable and beautiful from the overall perspective. The transmission and control system consists of control circuit, weft stop sensor, weft stop sensor, angle sensor, fully electrically coupled input and output circuit, execution circuit, electromagnetic clutch and electromagnetic brake, motor mechanical device, protection circuit, motor power supply and DC power supply, etc. composition. The shedding mechanism adopts the GT221 type dobby device. The shedding type of the device is half-shed, double-action type, and uses the Hartsley reciprocating working principle. The whole machine can accommodate 16 heald frames, and the dobby has a total of 20 heald arms. , four of which are for color selection. This mechanism adopts a negative constant tension spring return heald. The lifting and lowering of the heald frame is based on the weaving process and is signaled by the grain paper. It is completed by driving the heald lifting arm through the probe, vertical needle, upper and lower hooks, broach, and blade short connecting rod. The main shaft of the mechanism is driven by the crankshaft through the sprocket. The advantages of this mechanism are as follows: The force-bearing point of the hook is on the center line of the part, the force is uniform, and the work error rate is low; centralized oiling is adopted to prevent cloth surface contamination; the machine operates in a balanced manner with small vibration, and is suitable for looms with a high speed of 260r/ min; The varieties are easy to change, the adaptability range is small, and various fabrics from light to medium-thick can be weaved. Weft insertion mechanism The weft insertion mechanism is composed of two sets of connecting rods superimposed, which can reduce the lost motion of the rapier head and reduce the area occupied by the loom. While designing the weft insertion mechanism, the beat-up mechanism was also improved to reduce the connecting rod pressure angle from the original 35° to 25°. Each rod was optimized to make the reed seat rest slowly near the rear center. Extend the opening time to facilitate the sword advancement and weft transfer. In order to increase the beating-up force, an auxiliary reed base is added to the original basis to adapt to the weaving of medium-thick fabrics. Warp let-off mechanism adopts an external station-type warp let-off device, and the weaving beam detection device automatically adjusts the weaving beam angle through the linkage mechanism to ensure uniform warp delivery tension. This kind of let-off mechanism has a simple structure and is easy to adjust. It does not require any adjustment when changing from a full beam to an empty beam or loading a new warp beam. Warp stopping device adopts six rows of warp drop pieces to solve the problem that when weaving high-density fabrics, the warp yarns are too dense and crowded together to prevent the drop pieces from falling down during warp breaking, causing the machine to not shut down during warp break. The mechanism adopts a combination of mechanical and electrical methods. It is controlled by a mechanical pendulum swing and electronic control. When the warp yarn is broken, the drop wire falls by its own weight, causing a short circuit and automatically stops the circuit. It displays a red light signal, indicating the specifications and specifications of the drop wire. Shuttle looms are the same. Color selection device: The rear 6 blades of the dobby device drive the wire rope, enter the color selection box through the steering wheel, and drive the color selection rod to select colors. Due to the mechanical transmission, the color selection action is simple and reliable, not prone to damage or errors, and it is easy to adjust the color and variety, just change the texture paper. Production efficiency analysis The weft insertion mechanism is reasonably designed, and it consists of four connecting rods for weft insertion and five connecting rods for weft insertion. After the two sets of linkage mechanisms are superimposed, the rapier head can be reciprocated. The rapier head exits the shed at a slow speed and the stroke is reduced, and then slowly enters the shed, thereby reducing the overall size of the weft insertion mechanism. The floor space is reduced, and one shuttle loom can be replaced with the same reed width. It is not only used for the expansion of new factories, but also adapts to the renovation of old factories. The speed is higher than that of the automatic shuttle-changing loom, and the weft insertion rate can be increased by 25% to 30% without increasing the floor space. Relevant mechanical parts of the original 1515 and GA615 series shuttle looms are used to the greatest extent, and the standardization coefficient and universal and borrowed parts coefficients are increased, which greatly reduces turnover parts and spare parts, and reduces corporate investment costs. The mechanism is simple, the technical difficulty is low, the worker training period is short, and maintenance is convenient. The price is about 1/6 of the high-end rapier loom, and the investment recovery is quick. The noise is low, 10dB(A) lower than shuttle loom, about 85dB. Use and maintenance GA747 series rapier looms are modified on the basis of the original shuttle looms. Except for the different weft insertion system, the rest of the use and maintenance are basically the same as those of the shuttle looms. Maintenance includes the following 14 items: ① Check whether the parts and bolts are loose, worn or damaged, and deal with them in time. Check the entire site from top to bottom, left to right, front to back, and inside to outside. ② Check whether the main transmission components are normal and whether the electromagnetic clutch and brake function normally. ③ Check whether the dobby machine functions well, whether the position of the crankshaft during leveling is consistent with the leveling time required by the process, and whether the upper and lower broaches of the dobby device are in the same vertical position. ④ Check whether all components of the weft insertion mechanism function well. If necessary, adjust the two eccentric positions to ensure good meshing of the sector gears; the center transfer position of the weft transfer sword and the weft receiving sword is…�Good; check whether the bent axis of the loom is at 70°~75° when the rapier head enters the shed. ⑤ Check whether the rapier head and rapier head base plate are worn. In principle, the weft rapier base plate should be replaced every two months, and the sword transfer box should be refueled every 16 months. ⑥Use regular rules to check whether the sword belt guide rail is accessible and adjust the installation position of the track piece in time. ⑦ Check whether the various components of the weft feeding mechanism work well, whether the weft feeder and color selection rod actions are coordinated, and whether the weft stopping mechanism works well. ⑧ Check whether the scissors mechanism is normal and ensure that the blades move synchronously (2.5mm up and down each). The blade gap and blade angle meet the process requirements. It is required to sharpen the blades once every eight months. ⑨ Check whether the beat-up mechanism operates normally. Check once every eight months whether the height of the reed seat and the front-to-back distance of the rocking shaft are normal, and whether the reed-pressing steel bar is defective. ⑩ Check whether the action of the let-off mechanism is coordinated. When the crankshaft is 10° behind the upper center, whether the double-arm swing rod rotor and the large radius of the let-off cam are in contact, and the center of the mandrel connected to the let-off reciprocating rod and the pawl seat is offset behind the let-off cam. 15~20mm through the center of the vertical axis. 珏瑡Check whether all components of the coiling mechanism are functioning properly. Rongrong checks whether the waste edge winding mechanism and the heald frame edge twisting device work well. Check whether the warp breaking and closing mechanism works well. Yaoyao checks whether the stretching device works well and whether there are unsatisfactory side brace thorns on the cloth surface. The side braces should be replaced and inspected every 8 months.
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