Air jet loom is the use of the release of compressed air generated by the high-speed airflow, the weft yarn traction through the weaving mouth to complete the introduction of a new type of loom, is currently the fastest growing shuttleless loom in a type of machine.
1.Principle of Weft Drawing
Jet weft is the use of air as a weft-inducing medium to jet the compressed air flow on the weft yarn to produce friction traction for traction, the weft will be brought through the mouth of the shuttle, through the jet produced by the jet to achieve the purpose of weft-inducing.
Characteristics of air-jet fuselage
Air-jet weft-entry is characterized by high speed, high tension, small bobbin mouth, which requires high requirements for raw yarns and semi-products.
Air-jet weft-guiding is a kind of negative weft-guiding mode, the weft yarn in the leap shuttle mouth tension is small, no control, therefore, the weft yarn of the higher density or fancy yarn lacks sufficient traction. At the same time, the opening state of the warp yarn has a great impact on the quality of the weft guide, easy to produce weft shrinkage, weft yarn folding back and other fabric defects.
2.Main structure and characteristics
Air-jet loom mainly consists of frame, transmission and braking system, opening mechanism, weft draw-in mechanism, weft beating mechanism, warp feeding mechanism, winding mechanism, twisting mechanism, scissors mechanism, catching side yarn device, centralized oil supply and automatic control system.
The main structural and technical characteristics of air jet loom.
1. Weft drawing-in method
Under the action of main and auxiliary nozzles and shaped reeds, the high-speed airflow generated by the release of compressed air is utilized to draw the weft yarn through the weaving mouth to complete the weft drawing-in.
2. Opening method
There are crank opening, cam opening, dobby opening and jacquard opening, according to the fabric organization options. General conventional configuration for the cam opening.
3. Weft beating mode
There are four rods to beat the weft, six rods to beat the weft and conjugate cam beating three.
4. Warp feeding organization
The main use of electronic half-positive and half-negative continuous warp feeding and mechanical half-positive and half-negative continuous warp feeding.
5. Winding mechanism
There are mechanical continuous winding and electric winding. Domestic air jet loom is generally equipped with mechanical continuous winding.
6. Rolling cloth
Generally, the cloth is rolled up inside the machine, and the cloth can be rolled up outside the machine as an option.
7.Frame
The Japanese model adopts box-type wall panel frame, while the European model mostly adopts plate-type wall panel frame. Domestic air jet looms in both frame forms exist.
8.Transmission and braking
Resistance motor direct drive and brake, stepless speed regulation; super-start motor drive, electromagnetic brake; ordinary motor and flywheel and clutch drive, electromagnetic brake.
9. Lubrication
The main drive part adopts oil bath lubrication, and other parts adopt oil cup lubrication or centralized oil supply.
10.Yarn supply
The machine is equipped with a floor-standing yarn supply frame, which can be set up with 2, 4, 6 and 8 cylinders.
11. Weft measuring and storage
Electric drum storage, drum diameter and stop pin length.
12. Edge-twisting mechanism
There are planetary hemming, leno hemming, electronic hemming, folding into the edge and hot melt edge. According to the requirements of the fabric selection.
13. Fabric edge form
Raw edge, light edge two kinds. With the choice of institutions.
14. Edge support
Ring type side support. Select the number of rings and needle size according to the fabric.
15. Cutting
There are mechanical scissors and electronic scissors.
16. Weft finder
Optical detector. Reflective and transmissive.
17.Weft stopping device
Detecting the flight state of the weft by the detector, through the detection of the control unit to determine the flight of normal or not and issued a stop or continue to run the command.
18. Warp stop device
There are electrical contact rod warp stop frame type warp stop device, far infrared detection of warp stop device and combing type warp stop device. At present, most of the warp stop frame type, according to the warp density can be used 4, 6 or 8 columns.
19. Display
Keyboard display (parameter setting, loom status monitoring, self-diagnostic faults); multi-color indicator lights indicate the warp stop, weft stop, wait for information.
20. Attachment
Auxiliary main spraying, drafting spraying, weft braking device, etc.
21.Control system
Adopting microcomputer as the core of control, respectively control the introduction of weft, weft selection, weft storage, feeding and weaving machine action, set the weaving process parameters on the keyboard (warp tension, color, solenoid valve opening and closing time, etc.). By each control unit to control the corresponding action, in front of the loom left and right or in the middle of each has an operation button board, convenient for the operation of the blocker.
3.Scope of application and fabric varieties
Early air-jet loom to adapt to a very small range, mainly the production of white blank fabric, and fabric width is small, slow speed, fabric limitations, fabric quality is not high. But from the early 1980s, with the air jet loom shaped reed and relay weft technology development and electronic computers, sensors and frequency control technology applications, greatly improving the speed of the air jet loom and the loom's automatic monitoring level, especially in the last 10 years of rapid development of the air jet loom has made the air jet loom has a high-quality, high-speed, high-yield, high level of self-control, and so on, there are many advantages, species Adaptation range greatly improved.
The width of the air jet loom has risen from 190cm, 280cm to 340cm, 360cm, 400cm or more; the main nozzle has a single nozzle to double nozzle, four nozzles; by the computer software-controlled multi-color weft-inducing system, can be 4-color to 12-color weft; weft raw materials can be synthetic filament yarns, synthetic fiber staple fiber, cotton yarns, wool yarns, fiberglass yarns, all kinds of fancy yarns and so on; Product varieties from high-count dense thin high-grade fabrics to coarse-count high density thick fabrics can be produced, Dornier air-jet loom has been used to produce filter fabrics, sand cloth twill fabrics, steam fabrics and glass fiber wall coverings and other industrial fabrics. Belgium Bijano, Japan Tsudakoma new air-jet loom is also equipped with electronic jacquard, dobby and other openings to adapt to the production of multiple varieties of fabrics.