Types and technical performance of electronic weft selection devices
With the advancement of science and technology, electronic technology has been widely used. The automation level of rapier looms has been further improved in recent years. The weft selection device has also progressed from the original mechanical weft selection to today’s electronic weft selection device. Select weft.
1. Types of electronic weft selection devices
1. Stepper motor driven weft selection finger form
This is an advanced form in the world today, such as the GAMMA rapier loom of Picanol Company , Suzhou Bigale GTXPLUS loom has adopted this form, Gaochun Textile Machinery GJ600 rapier loom, and Guangdong Fengkai Machinery Manufacturing Co., Ltd. “Classic” rapier loom have also begun to adopt this weft selection form.
It is driven by an independent station module. Each module is composed of an independent station stepper motor and weft selection finger. It can be up to eight colors. Since it can be controlled by the loom microcomputer, it can be matched with the loom speed and weft selection. Cycle synchronization, the weft yarn runs straight, constant low tension can be maintained, the yarn threading position can be set, and the modules are interchangeable. Since there is no mechanical slack, there is no need for lubrication and maintenance, and it can be more adapted to high speeds (Figure 11-1) .
2. Linear motor driven weft finger selection form (combined by Shumate and Vanmate) TM11E super-excellent loom and Leonardo loom produced by Italian Promatech company. Both the K88 loom and the G6300 loom produced by Sulzer adopt the self-developed linear motor-type weft selection device. Its structure is compact, small in size, easy to operate by the operator, suitable for high speed and stable in operation. Now Ningbo Haiyang Textile Machinery Co., Ltd. has cooperated with Itema (Shanghai) Fabric Machinery Co., Ltd.
3. Electromagnetic electronic weft selection device
At present, most looms at home and abroad adopt electromagnetic electronic weft selection devices, such as foreign SM93 type, C401 type, P401 type, FAST type, GTM type, THEMA11E type Rapier looms, domestic China Textile Machinery, Xihang Company, Titan Textile Machinery, Liaocheng Textile Machinery, Jingwei Textile Machinery, Hangzhou Textile Machinery, Longli Textile Machinery, etc. all use this type of weft selector device. This series of devices is suitable for medium to high speed range. At present, this device has been mass-produced in China, with relatively stable quality, low cost, and low machine material consumption.
Taking the FAST electronic weft selector as an example to illustrate the working principle of the electromagnetic weft selection device. The electronic weft selector is equipped with multiple weft selection fingers, which can select a variety of weft yarns. The electronic weft selector controls the weft selection sequence based on electronic signals.
The main components of the weft selector are shown in Figure 11-2. The rotation of the cam 28 is transmitted through the loom pulley.
When a power signal is sent to the electromagnet 10, the stop block 29 is sucked down under the electromagnetization of the electromagnet. When the cam rotates to a certain angle, the cam 28 pushes the push rod 30, causing the lower end slope of the connecting rod 31 to contact the end face of the push rod, forming a fulcrum to swing backward around the fulcrum.
Through the connecting rod 31, the rocker arm 32 is pushed to rotate, so that the weft selection finger 19 is relaxed downward, and the weft selection finger sends the weft yarn into the weft feeding rapier jaw. When the electromagnet 10 is not energized, the backstop block 29 is released by the action of the spring 33. At this time, the connecting rod 31 has no fulcrum and the weft selector does not feed the weft.
2. Technical performance of electronic weft selection device
The following mainly introduces the technical performance requirements of electromagnet type weft selection device:
(1) The electromagnetic electronic weft selection device rotates once when the main shaft of the loom rotates once , only one weft selection finger must work at a time, and it should work cyclically, continuously, and stably according to the set program. There cannot be two weft selection fingers working at the same time or intermittently.
(2) All connecting shafts of the electromagnetic electronic weft selection device should rotate sensitively and should not have a sense of blockage.
(3) The height and height difference of all selected weft fingers should comply with the set values of the host machine, and there should be no collision with the fixed guide rail to ensure that the weft yarn can be correctly introduced into the jaws of the weft feeding sword head. For example: the height difference of SM93 electronic weft selection device is ≤6mm, the height difference of THEMA11E electronic weft selection device is 28~33mm, and the height difference of FAST electronic weft selection device is ≤6mm.
(4) The suitable voltage for the core iron coil (electromagnet) of the electromagnetic electronic weft selection device is DC 24~30V. After continuous operation, the coil temperature rise is ≤25°C. The core iron suction force should be more than 2 times greater than the electromagnet spring pressure.
(5) Rated speed, vibration, idle noise level, and idle power consumption are all selected by the overall design indicators of the loom. The currently selected parameters and indicators for domestically produced mid- to high-end looms are as follows:
FAST Type: vehicle speed 600r/min; empty vehicle noise pressure level ≤78dB; empty vehicle power consumption ≤65W. Vibration x≤1.5cm/s; y≤1cm/s; z≤1cm/s.
SM93 type: vehicle speed 400r/min; empty vehicle noise pressure level ≤86dB; empty vehicle power consumption ≤65W. Vibration x≤3cm/s; y≤3cm/s; z≤3cm/s.
(6) Oil leakage or oil leakage shall not occur after the electronic weft selection device is in operation.
(7) There should be no bumps or damage on the surface of the electronic weft selection device, and the paint layer should be completely smooth without peeling off.
(8) The lubrication method of the electronic weft selection device is determined by the overall design structure of the loom. Generally, there are two types of oil injection hole types: the whole oil bath type and the joint type pressure oil injection cup. The specific oil grade should be selected. It is clearly stipulated that No. 20 engine oil and calcium-based grease are generally used.
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