Instructions for modifying the shuttle loom with electronic warp delivery

Many weaving machines, especially old shuttle looms, use mechanical warp feeding, which has many defects, such as unstable warp feeding during operation; Intermittent warp delivery is prone to transverse and loose weft driving marks; Excessive wear of mechanical friction discs; Disadvantages such as time-consuming, laborious, and inefficient. To improve these, later loom manufacturers mostly adopted electronic warp delivery, which had good results. The electronic delivery system produced by This modifying type has been proven to have a very good improvement effect through long-term use and years of experience by many manufacturers. The specific explanation is as follows:

Firstly, structural composition

1. Motor, servo unit, servo drive circuit.

2. Electrical power supply and control unit: dedicated electrical program control supporting circuit.

3 reducer, connecting shaft, connecting sleeve, installation flange, spline connection, synchronous wheel connection drive and other accessories. (Depending on the actual needs of the loom)

4. Electric control box, connecting cables, plugs, sensors, etc.

Secondly, functional description

1. Manual tightening and loosening function.

2. Tension protection function.

During the weaving process, encoding and positioning can automatically track the speed of the loom and maintain stable warp tension.

4. Shutdown brake function.

Replacing the weaving shaft is convenient and fast.

Thirdly, the working principle of the control system

1. Traditional mechanical warp delivery is achieved through the transmission of linkages and camshafts. During one main spindle rotation cycle, the warp yarn is loosened when the tension is high, and stopped when the tension is low. When the weaving machine produces different fabrics, it is necessary to adjust the mechanical parameters of the warp feeding device to adapt to the different tensions of different warp yarns.

2. The newly modified electronic warp delivery uses an independent AC servo motor as the power source and a tension sensor to detect the tension of the warp yarn. When the tension is greater than the target value, the control circuit board calculates and controls the servo motor to deliver the warp yarn, reducing the tension; When the tension is less than the target value, the control circuit board controls the servo motor to increase the speed of the passage and increase the tension. In this way, it can ensure the horizontal tension of the warp yarn during the weaving process. It can automatically adjust the target tension required for different fabrics. The control system aims to control the warp tension, based on the actual warp tension and warp feed transmission ratio, and directly controlled by the warp feed servo motor, in order to achieve stable warp tension and smooth warp feed speed during the weaving process.

In this system, the warp tension sensor collects data and sends it to differential amplification processing to ensure high anti-interference performance of the signal; Perform thousands of process samples of tension signals within one spindle cycle and ensure the accuracy of tension collection; The system obtains the spindle angle through a photoelectric encoder and determines whether to start or stop the machine based on the operating signal of the loom. Thus making corresponding actions. During the normal weaving process, the system operates in automatic mode, using three parameters: comprehensive warp tension, basic process parameters of the main machine, and main control signal. After advanced control operation, it outputs control operation pulses to control the operating speed of the warp feeding and winding servo motors.

Development of projectile loom

The projectile loom is a loom that uses Projecitle gripper or projectile to introduce the weft into the shed. The projectile loom is suitable for wide width, low speed and high weft insertion. The weft insertion rate is up to 1100 m/min, and the P7200 Loom can reach 1200 m/min. It has strong adaptability to the variety of fabrics, can weave a variety of weft yarns and wide fabrics, and has low machine noise. There are series of projectile looms, PS,Tw11,PU,P7100,P7200;P7150;P7300 , with a working width of 220 cm~545 cm, which are divided into monochrome and multi-color, and can be used to weave pure and blended fabrics such as cotton, wool and chemical fibers. If equipped with dobby and jacquard opening mechanism, small and large pattern fabrics can be woven. The weft tension can be controlled to avoid the defects caused by tight and loose weft, and the fabric quality is excellent. In 1933, the German R. Rothman first proposed the projectile weft insertion. In 1934, the Swiss Sulzer company developed the projectile loom. In 1953, the Swiss Sulzer and Ruti companies first put it into industrial production.

Projectile looms have been extended to various industries such as cotton and wool, silk , towels, coarse materials, construction, Mesh screen, geotextile and industrial cloth.

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