study on the automation in speed frame

Welcome

Group Members:Name ID

Md.Mohit-Ul Alam 131-23-3384

Masum Billah 131-23-3435

Hafeza Islam 131-23-3358

Our presentation topic:

STUDY ON THE AUTOMATION IN SPEED FRAME

Speed frame

Objectives of speed/roving frame

The chief function of roving frame is the attenuation of sliver.

To draft the sliver to reduce weight per unit length.

Insertion of protective twist in order to hold the fine strand of sliver.

To make conical or tapper shape of the bobbin.Wind the twisted roving on to the bobbin. Winding of roving into a package that can be

transported, sorted, donned on ring spinning machine.

Q: Why the draw sliver is not direct used in ring machine ?

ANSWER:There are two main reasons:

The first reason is related to the required draft. The draw sliver is to thick, untwist strand that tends to be hairy and to create fly. The fine twisted roving is better to this purpose.

The second reason is that draw frame can represent the worst conceivable mode of transport and presentation of feed material to the ring spinning frame.

Main objectivesDRAFTING

TWISTING

WINDING

Main objectives

Operating region of Speed frame The creel The drafting arrangement

Roller drafting system

The apron Applying pressure

to the top roller. The condenser The spacer

Winding of bobbin Package

build Bobbin

drive Cone drive transmission The lifter motion The builder motion

Spindle & flyer Imparting

twist Spindle Flyer Design of

flyer Pressure

arm

Drafting arrangement of Speed frameRoller Drafting system

Conventional roller drafting system: 4 over 4 without apron.

Modern Roller drafting system: 3 over 3 drafting system with double apron

(Lakshmi Rieter FS185P) 4 over 4 drafting system with double apron (SKF PK

1600)

SKF PK-1600 drafting system

Draft range: Total draft 5 to 20Total draft is distributed in each zone as follows:

Back zone: Break draft is applicable in here. Amount of break draft is depends upon material.Material Break Draft

Sliver Coarse 1.5-1.4Sliver Medium 1.4-1.3Sliver Fine 1.3-1.2Sliver MMF 1.2-1.1

Middle zone: Less amount draft is applicable in here. Condenser is used in middle zone to condense sheet

like sliver. Front zone:

Maximum amount of draft is applicable in here. Apron is used in this zone.

DIFFERENT PARTS OF

SIMPLEX & THEIR FUNCTIONS

Roller typeTop rollers are synthetic rubber coatedBottom rollers are made of steelFront, 3rd and back rollers (bottom) are spiral

fluted. 2nd roller has granulated pin.

The ApronThe upper aprons are short and made either of leather or more commonly of synthetic rubbers. They have a thickness of about 1 mm and are held by tensioning device.

The lower aprons are longer and usually made of leather. They run over the guide bar, usually known as nose bar, to position close to the delivery roller.

Function:The aprons co-operated with each other t guide and transports the fibers during drafting and they exert a very significant influence on the drafting operations.

Applying pressure to the top rollerThe top roller must be pressed with relatively

high force against the lower rollers to ensure the guidance of fiber.

Pressure are in the range of 100 to 250 N per roller which may vary as per raw material and its volume.

Pressure is applied by spring pressure, pneumatic weighting, magnetic weighting.

Condenser

Feature:• Condensers are mounted on a reciprocating bar

behind the drafting arrangement.• The second condenser is provided in break draft

field.• And the 3rd one is located in main draft field. Function:• Spreading sliver masses are condensed to improve

evenness and lead to drafting zone. Advantage: • Reduce the high fly level and hairiness of roving.

Spacer

As the top apron are forced by spring pressure against the lower apron, the arrangement of this apron should permit precise adoption of minimum distance to fibre volume. In order to be able to maintain this minimum distance, spacer are replace ably inserted between the nose bar of the lower apron and the cradle edge of top apron. Spacer size is 4 to 7 mm in accordance with roving hank.

Imparting Twist

•  

The flyerFlyer is used to impart twistFlyer has two legs, one with hollow path or slot

and pressure arm another for balancing the flyer while rotating.

Flyer is placed on spindle, it gets motion by gearing.

Flyer speed has direct influence on production. Flyer can be varying in sizes which are

specified in inch. For example, 12”X 5.5”, 12”X6” and 14”X6”. First no. indicate maximum height and second no. indicate maximum dia of wound package.

Spindle

The spindle is a simply support and drive element for the flyer,without any axuilary function. It is a long steel shaft mounted at it’s lower end in a bearing.

Types of spindle:01.mounted mounted.02.closed mounted.03.top mounted.

Pressure Arm

A steel yoke attached to the lower end of hollow flyer leg is called pressure arm.

The roving is wrapped 2 or 3 times around the yoke.

The no. of turn determine the roving tension. For higher tension, a hard compact package is obtained and if it is too high false draft or roving breakage can be caused.

Therefore, the no. of wrap depends upon material and twist level.

Winding Principle

Bobbin leading principle (For cotton spinning)

Flyer leading principle (For jute spinning)

Bobbin leading PrincipleBobbin speed is higher than flyer

speed at all point of winding.The winding on speed is constant

throughout the process.With the increase of bobbin dia,

bobbin speed must be decreased. The variation of bobbin speed

with the increase of bobbin dia must be constant.

Less tension on roving. RPM

d

Empty Bobbin

Full Bobbin

BobbinSpeed

Flyer Speed

Faults of speed frame

01/ Irregular Roving. 02/ Roving breakage . 03/ Sliver breakage. 04/ Roller lapping. 05/ Unequal tapering . 06/ Hard roving bobbin. 07/ Ridgy bobbin . 08/Thicks thin place. M/C Faults:i. Fluction of powerii. Ununiform rotation of flyeriii. Using of damaged flyeriv. Damage top rollerv. Damage apron.

problem