Yarn suction device for automatic splicing unit
By designing a movable suction hood device on the ring spinning machine, combining curved and straight sections, the problem of difficult yarn picking in traditional ring spinning machines is solved, enabling safe and reliable yarn splicing operation on a compact machine.
Patent Information
- Application Number
- CN202511091850.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-08-07
- Filing Date
- 2025-08-05
- Publication Date
- 2026-02-10
AI Technical Summary
In traditional ring spinning machines, when the center-to-center distance between spindles is small, the automatic splicing unit makes it difficult for the suction device to reliably pick up the yarn without damaging machine parts, and existing modifications pose a risk of collision.
It employs a suction hood device that can move horizontally and vertically, combining curved and straight sections in its design, and is equipped with wear-resistant materials to avoid collisions with machine parts. It also achieves reliable yarn pickup through pneumatic, hydraulic, or electric drive.
It enables safe and reliable yarn end picking on compact ring spinning machines, avoiding damage to machine parts and suction devices, ensuring the accuracy of splicing operations and simplifying the modification process.
Smart Images
Figure CN121496624A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present invention relates to a ring spinning machine. In particular, the present invention relates to a yarn suction device for an automatic yarn joint unit in a ring spinning machine. More particularly, the present invention relates to a broken yarn pickup device for separating the end of a broken yarn from a spinning bobbin in order to enable an automatic joint operation in a ring spinning machine. BACKGROUND
[0002] Ring spinning machines are machines in textile spinning mills that produce the final yarn and are very critical machines. The ring spinning machine produces the final form of cotton in the spinning thread, i.e. the so-called yarn. Yarn breakages often occur in ring spinning machines, which is a major problem faced by the global spinning industry. Yarn breakages have to be continuously monitored and then the broken yarns have to be joined on the spot by workers immediately. Yarn breakages occur due to various parameters of the yarn and the machine, which is inevitable. In a mill having long spinning machine frames, yarn breakages have to be continuously monitored by manpower and workers have to walk along the path of the ring spinning machine frame throughout the day in order to manually joint the broken yarns. This is done in the case of a machine frame that is usually made up of more than 1800 spindles and is about 75 meters in length. After successful jointing of the broken yarn, the spinning process has to be restarted on the spot for each broken yarn spindle immediately to avoid waste of yarn.
[0003] In order to overcome the above mentioned problems, an automatic joint unit has been developed. The automatic joint unit is in the form of a movable vehicle having a guiding device. The joint vehicle stops at the position of the respective broken yarn spindle that needs to be jointed. The joint unit generally moves longitudinally on the passage of the machine frame. Before starting the joint operation, the joint vehicle stops in front of the position of the ring spinning machine spindle. Then, the broken yarn end available from the spinning bobbin has to be found, which is then separated from the bobbin and lifted upwards in order to enable the joint operation. The mentioned automatic separation of the yarn from the spinning bobbin is generally a difficult task.
[0004] Ring spinning machines are capable of winding yarn onto bobbins mounted on the spinning spindles, i.e. so-called yarn bobbins. When a yarn breakage occurs during the spinning process, the thread of the broken yarn gets entangled in the spinning bobbin. In order to enable a yarn joint, the end of the entangled yarn has to be separated from the bobbin. In order to pick up the end of the broken yarn from the bobbin, the automatic joint unit is generally provided with a suction device. A cylindrical suction nozzle with a mouth / opening extends from the joint unit and is generally positioned at a predetermined distance above the top of the spinning bobbin to suck the yarn end from the bobbin.
[0005] Traditional ring spinning machines have two rows of spindles (left and right sides), typically with a 620 mm center-to-center spacing between them. Compared to modern ring spinning machines, these traditional machines are very small and compact. The vertical axis of the spindles in these traditional ring spinning machines is usually in the same vertical plane as the fiber delivery area of the drafting rollers in the drafting unit. This limitation poses a major constraint on retrofitting the automatic splicing unit of traditional ring spinning machines used in textile mills, because the fiber exit area of the delivery groove rollers is in the same plane as the spindle's vertical axis. Furthermore, after retrofitting the automatic splicing unit in a traditional ring spinning machine, the pickup device of the automatic splicing unit may experience impact when placing the suction nozzle on the yarn tube of a broken yarn, as the nozzle cannot reach the spindle to pick up the broken yarn. This impact can damage both components of the ring spinning machine and the automatic splicing unit. Damage to the automatic splicing unit and the ring spinning machine itself leads to frequent replacements.
[0006] During automatic splicing, because the suction nozzle cannot reach the spindle position to pick up the broken yarn, the suction hood may collide with the conveyor groove rollers when it sucks up the broken yarn, potentially damaging the rollers. Furthermore, a tilting guide component, mounted along the outer surface of the suction nozzle and sliding on the suction hood, is required to lift the guide hook before placing the suction nozzle over the yarn tube of the broken yarn, thereby initiating the splicing.
[0007] There is a need to develop an improved yarn suction device that can reliably pick up yarn from the yarn tube without damaging the grooved rollers and machine parts, and also prevents damage to the suction nozzle itself. The present invention provides a solution for this purpose. Summary of the Invention
[0008] Invention Objectives
[0009] These are provided to present some ideas in a simplified form, which will be further described in the specific implementation below.
[0010] The main objective of this invention is to provide a yarn suction / pickup device for an improved automatic splicing unit of a ring spinning machine.
[0011] Another object of the present invention is to provide a yarn picking device for an improved automatic splicing unit for existing spinning machines with small spindle center-to-center spacing, which ensures accurate splicing operation and has a simple and reliable structure.
[0012] Another object of the present invention is to prevent damage to the grooved rollers and machine parts, and to prevent damage to the nozzle of the automatic connector unit itself. Summary of the Invention
[0014] An automatic splicing unit assists in yarn splicing operations during yarn breakage events in a ring spinning machine. Accurate pickup / separation of the broken yarn end is essential for successful splicing. To achieve this, the automatic splicing unit according to the invention is equipped with a movable suction hood device capable of moving in both horizontal and vertical directions. This movable suction hood assembly includes a circumferential housing that can surround the outside of the yarn tube by moving vertically from top to bottom. A controlled suction force is applied to the suction member to pick up the broken yarn from the yarn tube. Before starting to pick up the yarn, the circumferential suction hood in the splicing unit moves downwards towards the yarn tube from which the broken yarn is to be picked up. The suction hood is provided with a drive device capable of moving the suction hood up and down vertically. The drive device is at least one of a pneumatic drive unit, a hydraulic drive unit, an electric drive unit, and a screw-type drive unit. A fixed truncated conical portion is provided at the bottom of the suction hood for raising / tilting the yarn guide hook of the ring spinning machine. During the raising / tilting of the guide hook on the ring spinning machine, the fixed truncated conical portion cannot slide along the surface of the suction shroud.
[0015] According to the invention, the suction shroud is provided with at least two curved sections / parts. The curved portions are configured to improve the positioning of the suction shroud above the yarn tube during the pickup of the broken yarn end from the yarn tube. Suction shrouds with at least two curved or bent portions are advantageous when retrofitting automatic splicing units in conventional ring spinning machines (even those with a relatively small spindle center-to-center distance of 600 mm to 640 mm, preferably 620 mm). Furthermore, suction shrouds with curved portions prevent collisions between the suction shroud of the automatic splicing unit and machine parts of conventional ring spinning machines used in textile mills. The suction shroud according to the invention is provided with a substantially curved first portion, a substantially straight second portion, and a substantially curved third portion, wherein the curved first portion, the straight second portion, and the curved third portion are connected to each other in a continuous manner to approach and pickup the broken yarn from the yarn tube without any obstruction. The straight portion forms the central portion of the suction shroud assembly.
[0016] According to an advantageous embodiment of the invention, the yarn guiding portion and associated portion of the suction shroud are made of or coated with abrasion-resistant material.
[0017] Advantageously, the sliding yarn guide hook tilting guide component can be omitted from the suction cover assembly according to the invention.
[0018] Other aspects and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings, which illustrate the principles of the invention by way of example. Attached Figure Description
[0019] Figure 1 A side view of the suction device of the automatic splicing unit according to the present invention and a ring spinning machine is shown.
[0020] Figure 2 A schematic diagram of a suction shroud device provided in an automatic connector unit according to the present invention is shown. Detailed Implementation
[0021] refer to Figure 1 and Figure 2 Invention Objectives Summary of the Invention Figure 1 Figure The automatic splicing unit 1 moves longitudinally along the channel of the ring spinning machine 2. The ring spinning machine 2 winds yarn onto a bobbin mounted on the spinning spindle, also known as the yarn tube 3. When yarn breaks during spinning, the broken yarn becomes tangled in the spinning bobbin 3. To splice the yarn, the tangled ends of the yarn must be separated from the yarn tube 3.
[0022] The automatic splicing unit 1 assists in the yarn splicing operation during a yarn breakage event in the ring spinning machine 2. Accurate pickup / separation of the broken yarn end is essential for successful splicing. To achieve this, the automatic splicing unit 1 according to the invention is provided with a movable suction hood device 4 capable of moving in both horizontal and vertical directions. This movable suction hood assembly includes a circumferential housing that can surround the outside of the yarn tube 3 by moving vertically from top to bottom. A controlled suction force is applied to the suction member to pick up the broken yarn from the yarn tube (3). Before starting to pick up the yarn, the circumferential suction hood 4 in the splicing unit 1 moves downwards towards the yarn tube 3 from which the broken yarn is to be picked up. The suction hood 4 is provided with a drive device 5 capable of moving the suction hood vertically up and down. The drive device is at least one of a pneumatic drive unit, a hydraulic drive unit, an electric drive unit, and a screw-type drive unit. The bottom of the suction shroud 4 is provided with a fixed truncated conical portion 7 for raising / tilting the yarn guide hook 6 of the ring spinning machine 2. During the raising / tilting of the yarn guide hook 6 of the ring spinning machine 2, the fixed truncated conical portion 7 cannot slide along the surface of the suction shroud 4.
[0023] According to the present invention, the suction cover 4 is provided with a central portion / segment 4c and at least two curved portions / segments 4a, 4b. The curved portions 4a, 4b improve the positioning of the suction cover 4 above the yarn tube 3 during the pickup of the broken yarn end from the yarn tube 3. The suction cover having at least two curved or bent portions 4a, 4b is advantageous when retrofitting the automatic splicing unit 1 in a conventional ring spinning machine (even a conventional ring spinning machine with a relatively small spindle center-to-center distance of 600 mm to 640 mm, preferably 620 mm). Furthermore, the suction cover having curved portions 4a, 4b prevents collisions between the suction cover 4 of the automatic splicing unit 1 and machine parts of the conventional ring spinning machine 2 used in textile mills.
[0024] The suction hood 4 according to the invention is provided with a substantially curved first portion 4a, a substantially straight second portion 4c, and a substantially curved third portion 4b, wherein the curved first portion 4a, the straight second portion 4c, and the curved third portion 4b are connected to each other in a continuous manner to allow access to the yarn tube (3) and pickup of broken yarns from the yarn tube 3 without any obstruction. The straight portion 4c is formed as the central portion of the suction hood assembly 4. Advantageously, the suction hood assembly 4 is formed as a single component made of metal, polymer, or ceramic.
[0025] According to an advantageous embodiment of the invention, the yarn guiding portion and associated portion of the suction cover 4 are made of or coated with abrasion-resistant material.
[0026] Advantageously, the sliding yarn guide hook tilting guide component can be omitted from the suction shroud assembly according to the invention. The invention is applicable to both compact and non-compact ring spinning machines.
[0027] In view of the disclosure of this invention, all changes, modifications and variations within the equivalent meaning and scope are considered to be within the scope and spirit of this invention.
Claims
1. An automatic splicing unit (1) for a ring spinning machine (2), the automatic splicing unit comprising a suction hood (4) having a substantially circumferential opening for surrounding a yarn tube (3) of the ring spinning machine (2), and the suction hood being movable in a horizontal and vertical direction by means of a drive device disposed in the automatic splicing unit (1); wherein, The movable suction hood (4) is provided with a substantially straight central portion (4c) and at least two substantially curved portions (4a, 4b), and during splicing operations, the suction hood (4) moves downward toward the yarn tube (3) so as to pick up the end of the broken yarn from the yarn tube (3) by raising / tilting the guide hook (6) of the ring spinning machine (2).
2. The automatic connector unit (1) according to claim 1, wherein, The suction hood (4) is provided with a basically curved first part (4a), a basically straight second part (4c) and a basically curved third part (4b), wherein the curved first part (4a), the straight second part (4c) and the curved third part (4b) are connected to each other in a continuous manner to approach the yarn tube (3) and pick up the broken yarn from the yarn tube (3) without any obstruction.
3. The automatic connector unit (1) according to claim 1, wherein, The bottom of the suction hood (4) is provided with a fixed truncated conical part (7) for raising / tilting the yarn guide hook (6) of the ring spinning machine (2).
4. The automatic connector unit (1) according to claim 3, wherein, During the raising / tilting of the guide hook (6) of the ring spinning machine (2), the fixed truncated conical portion (7) cannot slide along the surface of the suction shroud (4).
5. The automatic connector unit (1) according to claim 1, wherein, A suction hood (4) having a straight center section (4c) and at least two curved or bent sections (4a, 4b) is suitable for use as an automatic splicing unit (1) in a ring spinning machine (2) with a small center-to-center spacing between two rows of spindles on the left and right sides.
6. The automatic connector unit (1) according to claim 5, wherein, The suction hood (4) is suitable for use in an automatic splicing unit (1) in a ring spinning machine (2) with a spindle center spacing of 600 mm to 640 mm, preferably 620 mm.
7. The automatic connector unit (1) according to claim 1, wherein, The suction shield (4) is formed as a single component made of metal, polymer or ceramic.
8. The automatic connector unit (1) according to claim 1, wherein, The suction cover (4) is assembled from one or more components, which are made of metal, polymer or ceramic.
9. The automatic connector unit (1) according to claim 1, wherein, The drive unit is at least one of a pneumatic drive unit, a hydraulic drive unit, an electric drive unit, and a screw-type drive unit.
10. The automatic connector unit (1) according to claim 1, wherein, The yarn guide portion and associated portion of the suction shroud (4) are made of or coated with abrasion-resistant material.