CN110387615B

CN110387615B - Thread end sucking and lifting device and method for thread end splicing unit

Info

Publication number: CN110387615B
Application number: CN201910316825.7A
Authority: CN
Inventors: 斯里尼瓦桑·拉贾斯卡兰; 耶干纳坦·帕苏帕蒂; 阿鲁兰南达姆·蒂利普·库马尔
Original assignee: Lakshmi Machine Works Ltd
Current assignee: Lakshmi Machine Works Ltd
Priority date: 2018-04-20
Filing date: 2019-04-19
Publication date: 2022-08-05
Anticipated expiration: 2039-04-19
Also published as: EP3556918B1; EP3556918A1; CN110387615A

Abstract

The invention relates to a thread end sucking and lifting device for a thread end splicing unit, which is used for separating broken yarns from cone yarns so as to realize automatic splicing operation in a cotton spinning ring spinning frame. Thus, the thread end suction device includes a base plate having a first end and a second end, and the first end connected to the actuator is movable forward to a base plate working position and backward to an origin position. The second end is a free end, and an opening is arranged near the free end and surrounds the cone yarn of the spindle in the working position. The device also comprises a plurality of nozzles having a plurality of orifices arranged around the opening profile, the jets of air in the operating position separating the tangled thread ends from the cheese and sucking them up into the drafting zone, thus enabling automatic splicing of the thread breaks in the textile machine.

Description

Thread end sucking and lifting device and method for thread end splicing unit

Technical Field

The invention relates to textile machinery, in particular to a thread end sucking and lifting device for a thread end splicing unit, which is used for separating a broken thread end from a spinning cone yarn so as to realize automatic splicing operation of the broken yarn end of a cotton spinning ring spinning frame.

Background

The cotton ring frames, which deliver cotton, the so-called yarn, at the final stage of the spinning line, are the most critical machines of the textile mill. In the ring spinning process, the yarn breakage phenomenon frequently occurs, and the broken ends need to be monitored and spliced manually and continuously. Yarn breakage is caused by various parameters of the yarn and the machine and is inevitable. The broken yarn often entangles with the yarn wound on the package at various locations from the top to the bottom of the package and cannot be precisely adjusted. In a long spinning frame workshop, a yarn worker continuously observes yarn breakage and carries out manual splicing on broken thread ends. This must be done on a yarn machine typically consisting of 1600 spindles. The spinning sequence must then be resumed from the yarn break to resume the spinning operation and avoid yarn waste.

To overcome the above problems, an automatic splicing unit has been developed. The unit takes the form of a wheeled/tracked mobile vehicle. The splicing cars are parked at the respective spindles where the splicing heads are required, and the splicing units are moved longitudinally, usually on creel aisles. Before the operation is started, the vehicle is stopped in front of the spindle of the cotton spinning ring spinning frame. Then, it is necessary to find the yarn end on the package, remove it from the package, and then lift it upward for the splicing operation. So far, in any known type of automatic splicing devices, the separation of the yarn from the package has not been successfully completed.

The present invention provides an improved apparatus for separating broken yarn ends from a spinning machine to achieve automatic splicing in a cotton spinning ring frame.

Disclosure of Invention

The invention has been described herein for the purpose of illustrating certain concepts in a simplified form that are further described below in the detailed description. This object is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.

The invention mainly aims to provide an improved thread end splicing unit for a cotton spinning ring spinning frame.

The invention also aims to provide a yarn broken end sucking and lifting device in the yarn broken end automatic splicing unit of the cotton spinning ring spinning frame.

It is another object of the present invention to provide an improved yarn break separating device in an automatic yarn break splicing unit of a cotton ring spinning frame.

Summary of the invention:

according to the invention, the automatic splicing unit is applied to the cotton spinning ring spinning frame, and when the cotton spinning ring spinning frame breaks, the automatic splicing device is beneficial to splicing operation of broken ends of yarns. In order to successfully splice the broken yarn, the broken yarn end must be properly picked/separated from the package. In order to separate broken thread ends, the thread end sucking and lifting device is arranged in the automatic splicing unit. The device is positioned in front of the ring plate and slightly lower than the ring plate, so that the device can blow airflow to the cheese from a plurality of holes to lift the broken thread end from the cheese. The nozzles are preferably arranged around the package at the bottom of the package. As an example, the suction device can be placed anywhere before the package from top to bottom depending on the actual situation. The separated end of the thread then moves up into a controlled suction nozzle adjacent the drafting unit to secure the yarn until it is delivered from the drafting zone to be spliced with the roving material.

The thread end sucking and lifting device for the automatic yarn end splicing unit comprises a base plate with a first end and a second end. The first end connected to the actuator is movable forward to the substrate working position and backward to the home position. The second end is a free end, and an opening is arranged near the free end and surrounds the cone yarn of the spindle in the working position. The thread end suction device also has a plurality of nozzles having a plurality of nozzle holes arranged around the opening contour, and the nozzles jet air flow when the base plate is in the working position, so that the tangled thread end is separated from the cone yarn, and the blown thread end is sucked upwards, thereby realizing the splicing of yarns of the textile machine.

The method for sucking and lifting the yarn through the thread end splicing unit comprises the following steps: the plurality of nozzles are arranged around the contour of the opening of the base plate, so that the plurality of spray holes are aligned with the cheese of the spindle, the spindle brake is braked and released (brake is released) for a preset time, air flow is sprayed for the preset time through the plurality of spray holes, the tangled broken yarn head is separated from the cheese, and the broken yarn is sucked upwards to realize splicing of the broken yarn.

Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of operation of the apparatus of the invention.

Drawings

For a more detailed understanding of the present invention, reference is made to the accompanying drawings, wherein:

FIG. 1 shows a thread end suction device according to the present invention;

FIGS. 2A and 2B are schematic views of a thread end suction device according to an embodiment of the present invention in an origin position and an operating position;

FIG. 3A shows a side view of an end of thread suction device according to the present invention, wherein a broken yarn is to be sucked;

FIG. 3B shows a side view of an end of thread suction device according to the present invention, wherein a broken yarn is sucked;

FIG. 4 shows a schematic view of a nozzle according to the present invention;

FIG. 4A shows a top view of a nozzle according to the present invention;

figure 4B shows a cross-sectional view of a nozzle according to the present invention.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of various exemplary embodiments of the present disclosure.

Throughout the drawings, it should be noted that the same reference numerals are used to describe the same or similar elements and features.

Detailed Description

The following description with reference to the accompanying drawings is provided for a full understanding of the exemplary embodiments of the present invention, as defined by the claims and their equivalents. It includes various specific details that are helpful for understanding, but these are merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention as claimed. Moreover, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

Provides an automatic piecing device for a cotton spinning ring spinning frame. The automatic splicing unit moves longitudinally along the channel of the yarn machine. A cotton ring spinning frame is capable of winding a yarn onto a bobbin, a so-called package, mounted on a spinning spindle. When the yarn is broken during spinning, the broken yarn is entangled with the cone yarn. To splice the yarns, the tangled ends must be removed from the cheese. Therefore, in the event of yarn breakage of the cotton ring spinning frame, the automatic piecing device contributes to the splicing operation of the broken ends of the yarns. In order to successfully splice the thread breaks, the thread breaks must be properly picked/separated from the bobbins. In order to be able to separate broken thread ends, the invention provides thread end suction devices in the automatic splicing unit.

Fig. 1 and 2A, 2B show schematic views of a thread end suction device of the present invention. The end-of-thread suction and extraction device 102 for the automatic yarn end splicing unit 100 comprises a base plate 104 with a first end and a second end. The first end connected to the actuator 106 is movable forward to an operative position on the substrate 104 and backward to a home position. Preferably, the actuators 106 are at least actuators with pneumatic piston cylinders or the like. The second end is a free end, with an opening near the free end, which in the operating position surrounds the package 110 of the spindle 112. In a preferred embodiment, the opening is semi-circular. The end suction device 102 further comprises a plurality of nozzles 108, the nozzles 108 being arranged around the contour of the opening and ejecting air streams in the operative position to separate the entangled end of thread from the package of yarn 110 and to suck the yarn upwardly into the draft zone, thereby achieving effective automatic yarn end splicing. Accordingly, fig. 3A shows a side view of the yarn breakage automatic splicing unit of the cotton ring spinning frame and the thread end sucking and lifting device in the winding bobbin according to the present invention, in which the broken yarn is sucked and lifted, and fig. 3B shows that the broken yarn is sucked and sucked upward into the top suction nozzle in front of the draft zone of the cotton ring spinning frame.

The nozzle 108 is a block-like structure having a plurality of nozzle holes 118B on a tapered surface, which form an acute angle between the top surface and the side surface facing the package. The air flow purge holes of the orifices 118B of the nozzle 108 form an acute angle with respect to the vertical. According to an embodiment of the invention, the acute angle between the nozzle hole 118B and the vertical direction is in the range of 15 ° to 30 °, preferably 20 °. The diameter of the orifice 118B is preferably 2 mm. The nozzle block has a through hole 118A along a horizontal axis parallel to the line of the locations of the plurality of spray holes 118B such that air from the suction source is delivered through the hole 118A to the plurality of spray holes 118B. The nozzle block may also be provided with orifices along a horizontal axis perpendicular to the line of the locations of the plurality of orifices 118B. Fig. 4 shows a schematic view of the nozzle, and corresponding fig. 4A, 4B show a top view and a cross-sectional view of the nozzle.

In a preferred embodiment, the number of nozzles 108 in the thread-end suction device 102 may be three. According to one embodiment, the nozzles may also be a common unit. The nozzles are arranged on the opening profile at an angle of 90 deg. between them. The first nozzle 108B is disposed in front of the package in a manner substantially parallel to the length of the ring frame. The second and

third nozzles

108A, 108C are arranged substantially perpendicular to the length of the ring frame, each nozzle being located on the side of the package. According to the present invention, each

nozzle

108A, 108B, 108C has a plurality of orifices 118B, preferably three.

During the thread end suction, the thread end suction device 102 is actuated to move forward to a working position, where the nozzle 108 is arranged in front of the ring plate of a cotton ring spinning frame (not shown) slightly below the ring plate concentrically around the package 110 of the spindle 112. In the next step, the package 110 on the spindle 112 is purged with air from the nozzle 108. Accordingly, the broken yarn 116 is blown up from the package 110 and captured by the suction nozzle 114 having a controlled suction force so as not to be released from the already wound package 110. The separated end of the thread then moves up into a controlled suction nozzle adjacent to the drafting unit to hold the yarn until the yarn is spliced with the drafted roving material delivered from the drafting zone.

According to an exemplary embodiment of the invention, the nozzles work in the following sequence to achieve a successful separation and suction of the broken thread end from the package. The nozzles are arranged along the contour of the opening at a predetermined distance from the spindle center. When the spindle brake (not shown) brakes for a predetermined period of time in the range of 0.1 to 1 second, for example 0.7 second, the spindle stops rotating. During this time, the second and third nozzles (side jets) are caused to jet gas through the plurality of jet holes for a fraction of a second in the range of 0.01 to 0.1 second, for example, 0.05 second. Subsequently, the spindle brake is released for a predetermined time in the range of 0.1 to 0.5 seconds, for example 0.2 seconds, rotating the spindle. During this time, the first nozzle jets the gas flow through the multiple/multiple orifices for a fraction of a second in the range of 0.01 to 0.1 second, for example 0.05 second. The yarn ends thus broken are separated from the package, the separation point can be anywhere from the top to the bottom, and are successfully drawn up to the draft zone. The thread end separated and blown upward by the nozzle is sucked by another controlled suction nozzle which is located at the top of the yarn breakage automatic splicing unit in front of the drafting zone of the cotton ring spinning frame (not shown), and thus the broken yarn is sucked to realize automatic splicing with the drafted material.

According to another exemplary embodiment, the nozzles are operated in the following sequence to achieve a successful separation and suction of the broken thread end from the package. Initially, the nozzles are placed along the contour of the opening at a predetermined distance from the spindle centre, the first nozzle emitting an air flow when the spindle brake is braked for a predetermined time interval; the spindle brake is then released at time intervals of a fraction of a second. During this time, the second and third nozzles jet air streams, with the result that the broken thread ends are separated from the package and blown upward to effect automatic splicing with the drawn material, the above-described working sequence being performed regardless of the position of the ring rail. The above are merely exemplary embodiments. The three nozzles may be operated in any different order and at any different time intervals, nor is the total number of nozzles limited to three, and may be more or less than three.

Generally, the suction and lifting device is placed in front of the ring plate, slightly below the ring plate, so that it jets air currents toward the package yarn from a plurality of jet holes for sucking the broken ends from the package yarn. As an example, the suction device can be placed in principle with advantage from the top down in any position in front of the package. In a preferred embodiment, the suction and lifting device is located at the bottom of the package, so that the automatic piecing device of the cotton ring spinning frame provides an effective broken end suction and lifting device.

As an example, embodiments of the present invention use a thread end suction and extraction device for an automatic yarn break splicing unit. Various modifications to these embodiments will be readily apparent to those skilled in the art from the description and drawings herein. Thus, the description is not intended to be limited to the embodiments shown with the drawings, but is to be accorded the widest scope consistent with the principles and novel and inventive features described/disclosed or suggested herein. Any modification, equivalent replacement, improvement, etc., which are within the spirit and principle of the present invention, should be included in the protection scope of the present invention.

Claims

1. A thread end suction and lifting device for a thread end splicing unit used on a cotton spinning ring spinning machine, comprising:

a substrate having a first end and a second end,

the first end connected to an actuator is movable forward to the substrate working position, backward to a home position,

the second end is a free end, an opening is arranged near the free end, and the opening surrounds the cone yarn of the spindle in the working position;

a plurality of nozzles having a plurality of orifices arranged around the contour of the opening, for ejecting air when the base plate is in the operating position, separating the tangled thread end from the cheese and sucking up the thread end, thereby achieving yarn splicing,

the nozzle holes form an acute angle with respect to a vertical direction, the acute angle being in a range of 15 ° to 30 °,

when the spindle brake is braked according to a preset time, at least one nozzle in the plurality of nozzles sprays airflow, when the spindle brake is released according to a preset time, other nozzles in the plurality of nozzles spray airflow,

the braking time of the spindle is 0.1 to 1 second, the release time of the spindle is 0.1 to 0.5 second, and the air injection time of the nozzle is 0.01 to 0.1 second.

2. The thread end suction device according to claim 1, wherein the nozzle is a block comprising three orifices on a conical surface, and the block has a through hole along a horizontal axis parallel and/or perpendicular to a line of positions of the three orifices, through which air from a suction source is delivered to the three orifices.

3. The thread end suction device of claim 1, wherein the nozzle is positioned on the contour of the opening of the base plate at an included angle of 90 °.

4. The thread end suction device of claim 1 wherein the actuator is a pneumatic piston cylinder actuator.

5. The thread end suction device according to claim 1, wherein the nozzle ejects the air flow at a predetermined time, and the air flow is ejected and stopped intermittently.

6. A method of drawing yarn through a thread end splicing unit, the method comprising:

arranging a plurality of nozzles around the outline of the opening of the base plate, and enabling a plurality of spray holes to spray air onto the spindle cone yarns;

the spindle brake brakes and releases according to preset time;

injecting a gas flow through a plurality of orifices of the plurality of nozzles for a predetermined time; and

the air flow of the nozzle separates the tangled thread ends from the cone yarn and sucks and lifts the yarn upwards to enable the yarn to be spliced in a spinning ring spinning machine,

when the spindle brake is braked according to a preset time, the at least one nozzle sprays air flow, when the spindle brake is released according to a preset time, the other nozzles spray air flow,