Functions And Components Of Drawing Frame

< p > > a href= "http://www.91se91.com/news/" > drawing frame < /a > according to drafting mechanism, it can be divided into two categories: roller drafting drawing frame and gill machine.

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< p > cotton spinning frame has a single eye, two eyes, four eyes and so on.

It is called single eye drawing frame after feeding many bars into a single bar after merging and drawing and exporting two stripes.

Each drawing frame has a separate pmission system.

The drawing frame is composed of feeding part, drafting part, sliver part and some automatic devices.

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< p > feeding part < /p >

< p > consists of feeding tube, guide bar roller, guide bar roller, guide bar platform (or viaduct) and cotton roller.

The sliver is led by the guide bar roller and the guide bar roller from the feeding cylinder, and the guide bar platform is sent in a certain direction.

On the high-speed drawing frame, the position of the guide bar roller is close to the feeding cylinder, and the cotton sliver is pulled onto the platform, and then the feeding roller is sent to the drafting mechanism.

This positive feeding can avoid the disorder of sliver sliver and reduce accidental elongation.

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< p > draft part < /p >

< p > consists of drafting mechanism and automatic cleaning device.

There are many types of drafting mechanisms, mainly determined by the combination of drafting rollers and additional control parts.

There are three ways to combine the upper and lower drafting rollers: one up and down (one roller, one lower roller), one upper two (one big roller, two lower rollers) and two upper ones (two rollers, one lower roller).

If the combination of each pair of rollers is all the same, the yarn is clamped in the same plane, that is, straight line drafting. If some of them belong to a combination of two or two upper ones, it will be called curve drafting, for example, three or four.

Because the bar must be curved in drawing, the additional friction force (Draft) is generated, which improves the control of < a href= "http://www.91se91.com/news/index_c.asp" > fiber > /a > motion.

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"P >" on the drawing machine, the root number of the feeding strip is much, and the pressure on the roller is much greater than that of the roving machine and the spinning frame.

For high speed drawing frame, it is particularly important that the amount of pressure is sufficient and stable.

The pressure way of drawing frame has been developed from early hammer type and lever type to rocker spring type, pneumatic type and hydraulic type.

The spring pressure of the rocker arm is used to obtain the pressure of the roller by the spring force.

It has the advantages of easy operation, vibration absorption, etc., but there are also phenomena of pressure loss and pressure inaccuracy caused by constant pressure attenuation and unstable spring material.

Pneumatic pressurization is based on the static pressure of compressed air at the junction point of the pressurized lever, or the inflatable gasbag (PAD) is applied to the pressurizing mechanism.

Hydraulic pressure is applied directly to the roller by means of oil pressure through the pipe.

Both have the advantages of simple structure, stable pressure, no deformation and no loss of pressure.

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< p > cleaning device is used to remove flying dust and dust on the surface of rollers and rollers in time to prevent accumulation and fall into cotton sliver to form yarn faults. This is especially important for high-speed drawing frames.

Usually, vacuum suction type automatic cleaning device is adopted. The flying flowers and dust chips are wiped off by the roller and roller scraper or rotary velvet cover, and the suction device is sucked into the dust filter box by the upper and lower suction devices.

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< p > > section < /p >

< p > including cluster mechanism, mouth, tight roller, ring bar, < a href= "http://www.91se91.com/news/index_c.asp" > cotton < /a > cylinder base, etc.

The cluster mechanism consists of a cluster, a cluster roller and an arc tube.

The cluster is a new type of metal collector with large inlet and small outlet. It is fixed in front of the front drafting roller, and the cotton net is gathered in a timely manner to prevent the loss and confusion of the side fibers when the cotton web is exported at high speed, increasing the cohesion between the fibers and reducing the winding and breaking phenomenon.

The function of the cluster roller is to compress the cotton belt and stabilize the elongation of the fiber.

The arc tube is a 1.5 closed or closed copper conduit. The cotton belt is smoothly imported into the mouth to prevent the cotton belt from breaking or blocking the mouth.

The function of the mouth and the compact roller is to press the cotton belt into a tight and smooth strip, so that the stripes can reduce accidental elongation and increase the capacity of the cotton sliver.

The inclined tube gear, which is compacted by pressing the roller, enters the ring gear of the loop device (the ring bar), and is inserted into the cotton tube by the cycloidal shape.

In order to adapt to the processing of chemical fiber raw materials, the strip part adopts spiral space curve inclined tube ring plate, which can prevent the blockage of the inclined strip pipe.

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< p > in addition, the high-speed drawing frame must be equipped with a self stopping device with high sensitivity, including the self stopping of the rollers and broken ends in front of the machine, the self stopping of the broken ends and the self stopping device after the machine.

The braking device of the drawing frame can prevent the quality defects and the loss of the parts caused by the inertia effect of the high-speed parts after stopping.

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The yarn faults of < p > drawing frame can be divided into three categories: mechanical wave irregularity, draft wave irregularity and artificial yarn faults.

In the < a href= "http://www.91se91.com" > high speed drawing frame < /a >, the proportion of yarn faults caused by mechanical unevenness is the largest, mainly occurring in drafting parts, pmission parts and cleaning devices, showing that the stripes are irregular in thickness.

The uneven yarn draft is caused by improper configuration and drafting mechanism.

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