CN87207310U

CN87207310U - High draft ratio drafting system

Info

Publication number: CN87207310U
Application number: CN 87207310
Authority: CN
Inventors: 唐文辉; 陈尚贤
Original assignee: CHINESE TEXTILE UNIV
Current assignee: CHINESE TEXTILE UNIV
Priority date: 1987-07-17
Filing date: 1987-07-17
Publication date: 1988-09-07

Abstract

The utility model relates to a high draft ratio drafting system, which is reformed and developed at the back drafting zone of the drafting device of a ring spinning machine. A rotary control roller which is connected with a cradle is arranged at the back zone of the ring spinning machine, after depressing the cradle, an enclosing arc a and an enclosing arc c are respectively formed on the surface of a back bottom roller and the control roller by the thick spinning which is fed through a guide yarn horn. The utility model enhances the strength of the friction force boundary of the jaw of a back roller, increases positive control to a fiber strip, improves the inherent quality of the fiber strip, and obtains the effects on improving the quality of yarn and increasing the ability of total drafting. The utility model has the advantages of high adaptability, low cost of reformation, obvious effect, easy operation, etc. for reforming the ring spinning machine.

Description

High draft ratio drafting system

The present invention is a kind of through local improvement, can improve the novel high times drafting device of ring throstle that yarn quality also can improve the total draft multiple.

Modern ring throstle is that to seek a kind of brand-new improvement more and more difficult, but do not hinder key parts is not in addition done some local improvement, to obtain certain tangible economic benefit.

In modern spinning process field, the ring spindle yarn drafting system mainly can reduce three classes: the SKF drafting system of Germany Aktiebolaget SKF, the V-type high times drafting device of the R2P drafting system of Switzerland Rieter Perfojet and Germany Yi Na company.The proparea of this three major types drafting system is the two apron elastic nips of length, and its back zone, the above two are the drawing-off of simple roller straight line, as Fig. 1, shown in 2.

The characteristics of Yi Na V-type high times drafting device are that about half roller diameter has been raised with respect to the drawing-off plane in its back bottom roll position, the epithelium posterius roller relatively the back bottom roll setover backward about 25 the degree, make fiber strip in the first break draft district on rear roller, form the curve drawing of grip hold arc like this, the yarn shape that is in the shape of the letter V in the first break draft district, therefore this drafting system is called the V-type drawing-off, as shown in Figure 3.

The control action of first break draft district to fiber strip developed in the V-type drawing-off, thereby improved the drawing-off ability and improved yarn quality, but in use has following problem:

1. because back bottom roll and epithelium posterius roller position change, and this just requires roller slide and transmission mechanism redesign, the specification requirement height that drafting system of ring spinner is transformed like this, improvement expenses is big, is a big obstacle;

2. it is positive not enough only to utilize rear roller surface grip hold arc counter extensioin yarn to control, and effect is also big inadequately;

During running operation to the importing inconvenience of rove;

4. require the feeding loudspeaker of special-purpose coupling.

The utility model purpose is to provide a kind of novel high times drafting device, and its technical characterstic is exploitation first break draft district on traditional drafting system basis, and its drafting system structure as shown in Figure 4.

On the back bottom roll 1 in first break draft district, except original epithelium posterius roller 2, also increase rotating circular control roll 3 of contact nearby, this has just changed the track through guide loudspeaker 5 feeding first break draft district's drawing-off yarns 4, and the surface that drawing-off yarn 4 is attached to bottom roll 1 forms grip hold arc

, transfer to middle roller jaw 6 along control roll 3 again, form grip hold arc on control roll 3 surfaces

, the drawing-off yarn forms near the rear roller jaw like this

+

=

Grip hold arc.

Grip hold arc has strengthened rear roller jaw friction field intensity greatly, thereby enlarge markedly the control and the tightness of counter extensioin yarn, improve the immanent structure of drawing-off yarn and improve the straightening of fibers depth of parallelism, thereby changed back area draft process and proparea drafting process, obtained the effect of improving yarn quality and increasing the drawing-off ability.

Control roll 3 structures as shown in Figure 5, be external diameter φ be 16-26mm the groove roller arranged, groove width l is 20-26mm, and groove depth h is 0-1mm, to adapt to the feeding rove of various numbers, it is to form smooth control that employing has the purpose of groove control roll, to adapt to different fibre length in the feeding rove, control roll 3 smooth surfaces, swinging, can not produce flower integrable yarn defect, control roll 3 and reel cage 7 composite joints are as shown in Figure 6.When reel cage was depressed, control roll 3 contacted with bottom roll 1.When reel cage started, control roll 3 started with the back roller, therefore operation was not had the worry of inconvenience.

In order to increase the effect of control roll 3, epithelium posterius roller 2 centers are moved after should be suitably and are advisable, general after the amount of moving e be that 6-16mm(sees Fig. 4).

The on line (MN) at control roll 3 centers and bottom roll center is 60 degree-75 degree (see figure 4)s with respect to the orientation angle α between epithelium posterius roller center and the bottom roll center on line (PR).

The drawing of accompanying drawing is described as follows:

The novel high drafting of Fig. 1 SKF drawing-off Fig. 4

Fig. 2 R2P drawing-off Fig. 5 control roll

The novel reel cage pressurization of Fig. 3 V-type drawing-off Fig. 6 drafting system

Embodiment 1

Carry out the contrast test of common reel cage drafting system and novel high times drafting device on FA502 type fine spining machine, test is at same raw material, same rove, spins 18 special textile general comb stocking yarns with on the ingot number.Process conditions: 32 times of total drafts, 1.25 times of back area drafts, the ratch proparea is 43mm, the back zone is 54mm, before, during and after roller per 2 ingots that pressurize be respectively 150,100,120 newton.Result of the test is as shown in the table:

Embodiment 2.

Spin 13 special polyesters, the conventional draft device is 38 times, and novel drafting system is 48 times, and other condition is with embodiment 1, and result of the test is as shown in the table:

Claims

1, be applied on the two apron reel cage straight line drafting systems of ring throstle three rollers, improve the novel high times drafting device of yarn quality and increase total draft ability by back zone exploitation, be characterized in acquiring a rotating control roll 3 with the reel cage composite joint in the first break draft district, control roll 3 is composite joint with reel cage, when reel cage is depressed, control roll 3 contacts with bottom roll in the back zone, the on line at the center of control roll and bottom roll center (MN), with respect to the orientation angle between epithelium posterius roller center and the drop-down center on line (PR) is α, and the orientation angle α of control roll 3 is the 60-75 degree.

2, claim 1 said novel high times drafting device is characterized in that control roll 3 external diameter φ are 16-26mm, groove width l20-26mm, groove depth h0-1mm.

3, claim 1 or 2 said novel high times drafting devices are characterized in that the amount of moving e is 6-16mm behind the center of epithelium posterius roller.