Rising piece synchronous forced telescopic non-cutting dynamic head changing device and dismounting method thereof

Abstract

The application relates to the technical field of glass fiber production equipment, in particular to a yarn-cutting-free automatic head changing device with synchronous forced expansion and contraction of expansion pieces and a dismounting method thereof. The device comprises a main shaft, a rotating drum, a front cone sleeve, a rear cone sleeve and a plurality of expansion pieces; the rotating drum is fixedly arranged on the main shaft, the front cone sleeve and the rear cone sleeve are arranged on the front and rear sides of the rotating drum respectively, and the expansion pieces are movably arranged on the rotating drum and have front ends and rear ends movably inserted into and connected with the front cone sleeve and the rear cone sleeve respectively; the device is characterized in that a plurality of wire winding tiles are further arranged and fixedly connected to the expansion pieces. The application can realize automatic recovery and treatment of transition yarn through synchronous forced expansion and contraction of the expansion pieces and the wire winding tiles, simultaneously simplifies components of a head, and reduces the dismounting difficulty of the head.

Description

Technical Field

[0001] This application relates to the technical field of glass fiber production equipment, specifically to an automatic yarn-changing device for synchronous forced expansion and contraction of fiber sheets without cutting, and its assembly and disassembly method. Background Technology

[0002] In glass fiber drawing production, the two main types of drawing machine head expansion plates are centrifugal expansion without shrinkage, and forced expansion with only a slight shrinkage to overcome the plate's own weight, where the expansion plates are held together by tension springs at both ends. However, in cases where the sizing agent is viscous, the expansion plates easily stick to the inner wall of the yarn bobbin. Even though the tapered sleeves at both ends have moved away from the expansion plate's taper, the tension springs lack the ability to shrink, resulting in the entire expansion plate remaining connected to the inner wall of the yarn bobbin, making unloading difficult. This severely hinders the implementation of automation in glass fiber drawing production and restricts the industry's development. Currently, due to the demand for intelligent manufacturing automation upgrades, some glass fiber companies urgently need to change traditional drawing and unloading methods and break through drawing processes to improve automated production efficiency and product quality.

[0003] Please refer to the prior patent application: CN114988696B, Forced Expansion and Retraction Device for Glass Fiber Drawing Machine Head. This patent discloses a forced expansion and retraction device for an expansion sheet, comprising a rotating drum, an expansion sheet, and a disc-shaped conical sleeve. The expansion sheet is steppedly and movablely embedded in the rotating drum and driven by the disc-shaped conical sleeve. Both ends of the expansion sheet are provided with expansion sheet expansion grooves for engaging with the disc-shaped conical sleeve; the disc-shaped conical sleeve and the expansion sheet expansion grooves are connected by a movable insertion mechanism.

[0004] While this patent enables forced expansion and contraction of the bobbin, the snap-fit ​​connection between the bobbin and the rotating drum necessitates inserting or removing the bobbin from the end of the rotating drum during installation and removal, making the process rather complex. Furthermore, this patent utilizes traditional yarn feed rings and hooks for bobbin changing, which, while efficient, does not automatically recover the transition yarn wound around the yarn feed ring during bobbin changing.

[0005] To address the issue of automatic yarn recovery, the applicant developed a top-head-changing, non-cutting yarn mechanism employing a forced telescopic block. Please refer to [link / reference]. Figure 8The forced telescopic block mainly includes a telescopic block 100, a telescopic frame 200, a telescopic drive head 300, a hinge shaft 400, a telescopic block limiting shaft 500, and a push-pull linkage 600. When this forced telescopic block mechanism is installed on the machine head, the telescopic block 100 can automatically extend and retract via the push-pull linkage 600. During expansion, it performs the normal head-changing operation; during retraction, it reduces resistance and recycles the transition yarn. Although this forced telescopic block mechanism can recycle the transition yarn through automatic retraction, it suffers from numerous components, complex connections, and the need for pneumatic circuits and cylinders for drive, resulting in low assembly efficiency and complex maintenance and disassembly processes. Summary of the Invention

[0006] In view of this, this application provides an automatic yarn-changing device for synchronous forced expansion and contraction of the yarn sheet without cutting, and its disassembly and assembly method, to solve all or part of the technical problems described in the background section of this application.

[0007] The innovative approach of this application is as follows: a synchronous forced expansion and contraction mechanism is constructed using a winding sheath and a tensioning plate. The winding sheath and the tensioning plate are connected by straight grooves and respectively mounted on the upper yarn seat and the rotating drum, and are limited by locking strips. The synchronous forced expansion and contraction mechanism is driven by an existing tapered sleeve, and the axial movement of the tapered sleeve drives the winding sheath and the tensioning plate to expand and contract synchronously. This not only enables automatic expansion and contraction to facilitate the expulsion of transition yarn, but also simplifies the components, connections, and assembly / disassembly processes.

[0008] This application provides a solution to its technical problem as follows: An automatic yarn-changing device for synchronous forced expansion and contraction of expanding plates includes a main shaft, a rotating drum, a front conical sleeve, a rear conical sleeve, and several expanding plates; the rotating drum is fixedly mounted on the main shaft, the front and rear conical sleeves are respectively mounted on the front and rear sides of the rotating drum, and the expanding plates are movably mounted on the rotating drum with their front and rear ends movably inserted into and connected to the front and rear conical sleeves, respectively; the device is characterized in that it also includes several winding tiles, which are fixedly connected to the expanding plates.

[0009] Furthermore, it also includes an upper screw seat, a spring seat, a front spring, and a rear spring; the upper screw seat is located on the front side of the front tapered sleeve and a front spring is provided between the upper screw seat and the front tapered sleeve, the spring seat is located on the rear side of the rear tapered sleeve and a rear spring is provided between the spring seat and the rear tapered sleeve, and the wire sheath is movably mounted on the upper screw seat and its end is fixedly connected to the expansion plate.

[0010] Furthermore, it also includes several locking strips; several expansion grooves are provided on the rotating drum; locking strip grooves are provided on the inner walls of both sides of the expansion grooves; the expansion strip is provided with an expansion strip body and a rotating drum connecting part; the inner end of the rotating drum connecting part is provided with an inner locking groove, the outer end of the rotating drum connecting part is provided with a winding tile connecting position, and the two sides of the rotating drum connecting part are provided with expansion strip locking positions; the winding tile is provided with a winding part and an upper wire seat connecting part; the two sides of the upper wire seat connecting part are provided with winding tile locking positions, and the inner end of the upper wire seat connecting part is provided with an expansion strip connecting part. The connection is fixedly connected between the wire-wound tile connection position and the expansion tile connection position, and defines the outer locking groove; the upper wire seat is provided with several wire-wound tile connection grooves, and the slot of the wire-wound tile connection groove is provided with an upper wire seat locking position; the rotating drum connection part of the expansion tile is movably set in the expansion tile groove, and the upper wire seat connection part of the wire-wound tile is movably set in the wire-wound tile connection groove of the upper wire seat; the locking strip is simultaneously set in the expansion tile locking position, the wire-wound tile locking position, and the upper wire seat locking position; the front cone sleeve and the rear cone sleeve are respectively locked and connected to the outer locking groove and the inner locking groove.

[0011] Furthermore, it also includes an outer end cap and an inner end cap; the outer end cap is set on the outer end face of the upper wire seat and is used to encapsulate the wire winding tile connecting groove; the inner end cap is set on the inner end face of the rotating drum and is used to encapsulate the expansion groove.

[0012] Furthermore, it also includes an inner end cover; the inner end cover is mounted on a spring seat; the spring seat is mounted on the main shaft.

[0013] Furthermore, it also includes a yarn pushing mechanism; the yarn pushing mechanism includes a radial yarn pushing rod, a yarn pushing piston shaft, a return spring, and a cylinder head; the radial yarn pushing rod includes a central disc and several radial rods; the radial rods are disposed on the central disc and extend radially; a yarn pushing piston cavity is provided at the front end of the main shaft, a movable cavity is provided at the center of the upper yarn seat, and several yarn pushing channels are provided on the side wall of the movable cavity; the cylinder head is disposed at the opening of the yarn pushing piston cavity, the yarn pushing piston shaft is disposed in the yarn pushing piston cavity and the shaft extends out of the cylinder head, the return spring is disposed in the yarn pushing piston cavity and is located between the piston of the yarn pushing piston shaft and the cylinder head; the central disc of the radial yarn pushing rod is disposed in the movable cavity and is fixedly connected to the extended end of the yarn pushing piston shaft, and the radial rods are disposed in the yarn pushing channels.

[0014] Furthermore, the main shaft is equipped with a tensioning drive air port, a yarn pusher drive air port, and an air delivery channel; the air delivery channel is equipped with multiple air needles; the multiple air needles include a radial air inlet pipe and an axial air delivery pipe; the axial air delivery pipe is sealed to the radial air inlet pipe; a front drive cavity and a rear drive cavity are formed between the front tapered sleeve, the rear tapered sleeve, and the rotating drum, respectively; the yarn pusher drive air port is connected to the radial air inlet pipe, and the radial air inlet pipe is connected to the yarn pusher piston cavity; the tensioning drive air port is connected to the air delivery channel, and the air delivery channel is connected to the front drive cavity and the rear drive cavity.

[0015] Furthermore, both the expansion groove and the wire-wound tile connecting groove are straight grooves.

[0016] Furthermore, the front and rear tapered sleeves have the same structure, both including an annular retaining edge, an air chamber, and a central shaft hole; the central shaft hole is sleeved on the rotating cylinder, and the air chamber and the rotating cylinder define a front drive chamber or a rear drive chamber; the annular retaining edge is inserted into the inner retaining groove or the outer retaining groove.

[0017] The disassembly and assembly methods of the aforementioned automatic yarn feeder devices for synchronous forced expansion and contraction of various expansion plates include the following steps: The assembly steps are as follows: First, fasten the expansion plate and the wire winding tile together; then, assemble the expansion plate and the wire winding tile onto the rotating drum and the upper wire seat respectively; then, insert the retaining strip; finally, assemble the outer end cover onto the outer end face of the upper wire seat to complete the sealing and fixing. The disassembly steps are as follows: First, remove the outer end cover on the outer end face of the upper wire seat; then pull out the retaining strip; then remove the expansion plate groove and the winding tile connecting groove respectively.

[0018] Furthermore, in the assembly step, the expansion piece and the winding tile are first fastened together by the winding tile connecting position on the expansion piece and the expansion piece connecting position on the winding tile; then, the rotating drum connecting part of the expansion piece is placed into the expansion piece groove on the rotating drum, and at the same time, the upper wire seat connecting part of the winding tile is placed into the winding tile connecting groove on the upper wire seat; then, the locking strip is inserted into the locking groove of the rotating drum, the expansion piece locking position of the expansion piece, the winding tile locking position of the winding tile, and the upper wire seat locking position of the upper wire seat; finally, the outer end cover is assembled onto the outer end face of the upper wire seat to complete the sealing and fixing.

[0019] Beneficial technical effects: The automatic yarn-changing device disclosed in this application can automatically recycle the transition yarn by synchronously and forcibly extending and retracting the expansion plate and the winding tile. At the same time, it simplifies the components of the machine head and reduces the difficulty of assembling and disassembling the machine head.

[0020] The technical solution and technical effects of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 : Schematic diagram of the cross-section of the non-cutting moving head-changing device; Figure 2 : Figure 1 Schematic diagram of the transfer cylinder structure; Figure 3 : Figure 1 Schematic diagram of the middle conical sleeve structure; Figure 4 : Figure 1 Schematic diagram of the expansion joint structure; Figure 5 : Figure 1 Schematic diagram of the wire-wound tile structure; Figure 6 : Figure 1 Schematic diagram of the upper and middle wire seat structure; Figure 7 : Figure 1 Schematic diagram of the middle yarn pushing mechanism; Figure 8 : Schematic diagram of the structure and principle of the existing forced telescopic block head-changing yarn-cutting mechanism; Icon description: 1-Main shaft; 11-Pushing piston chamber; 12-Expansion plate drive air port; 13-Pushing rod drive air port; 14-Air delivery channel; 2-Rotating drum; 21-Expanding groove; 22-Clamping groove; 23-Front drive chamber; 24-Rear drive chamber; 3-Front cone sleeve; 31-Annular retaining edge; 32-Air cavity; 33-Central shaft hole; 4-Rear cone sleeve; 5-Expanding piece; 51-Expanding piece body; 52-Rotating drum connecting part; 521-Inner locking groove; 522-Wire winding tile connecting position; 523-Expanding piece locking position; 524-Outer locking groove; 6-Wire-wound tile; 61-Wire-wound part; 62-Upper wire seat connecting part; 621-Wire-wound tile locking position; 622-Expansion piece connecting position; 7- Upper yarn seat; 71- Winding tile connecting groove; 72- Upper yarn seat locking position; 73- Movable cavity; 74- Yarn pushing clamp; 8-Spring seat; 9-Front spring; 10-Rear spring; 20-Card slot strip; 30 - Outer end cap; 40-Inner sealing head sheet; 50-Inner end cap; 60- Yarn pushing mechanism; 610- Radial yarn pushing rod; 620- Yarn pushing piston shaft; 630- Return spring; 640- Cylinder head; 650- Center plate; 660- Radial rod; 70 - Multi-channel air needle; 710 - Radial air inlet tube; 720 - Axial air delivery tube. Detailed Implementation

[0022] Direction Explanation: In this application, the direction of the upper screw seat is front or outward, and the opposite direction is back or inward.

[0023] Please see Figures 1 to 7 The automatic yarn-changing device with synchronous forced expansion and contraction of the expansion plates includes a main shaft 1, a rotating drum 2, a front cone sleeve 3, a rear cone sleeve 4, several expansion plates 5, a winding tile 6, a yarn-loading seat 7, a spring seat 8, a front spring 9, a rear spring 10, and several locking strips 20.

[0024] The rotating drum 2 is fixedly mounted on the main shaft 1. The front tapered sleeve 3 and the rear tapered sleeve 4 are respectively mounted on the front and rear sides of the rotating drum 2. The upper screw seat 7 is mounted on the front side of the front tapered sleeve 3 and a front spring 9 is provided between the upper screw seat 7 and the front tapered sleeve 3. The spring seat 8 is mounted on the rear side of the rear tapered sleeve 4 and a rear spring 10 is provided between the upper screw seat 8 and the rear tapered sleeve 4. The expansion plate 5 is movably mounted on the rotating drum 2 and its front end and rear end are respectively movably inserted into and connected to the front tapered sleeve 3 and the rear tapered sleeve 4. The winding screw 6 is movably mounted on the upper screw seat 7 and its end is fixedly connected to the expansion plate 5. The locking strip 20 is simultaneously mounted in the upper screw seat 7 and the rotating drum 2, and extends from the outer end face of the upper screw seat 7 to the inner end face of the rotating drum 2.

[0025] in: The installation and fixing of the front spring 9 and the rear spring 10 can be accomplished by using a groove structure and / or a guide rod component in conjunction. For example, spring grooves can be provided at corresponding positions on the front tapered sleeve 3 and the upper screw seat 7, and the two ends of the front spring 9 can be respectively placed in the spring grooves; alternatively, a guide rod component can be added to guide the extension and contraction of the spring. The installation of the rear spring 10 is similar and will not be described in detail here.

[0026] The movable connection between the expanding piece 5 and the rotating drum 2 adopts the following mating structure: the rotating drum 2 is provided with several expanding piece grooves 21; the expanding piece 5 is provided with an expanding piece body 51 and a rotating drum connecting part 52; the expanding piece body 51 is an arc-shaped surface structure used to support the yarn bobbin; the rotating drum connecting part 52 is used to cooperate with the expanding piece grooves 21 to realize the movable connection between the expanding piece 5 and the rotating drum 2. Furthermore, unlike the constricted insert groove used in existing insert connections, the expanding piece groove 21 in this application is a straight groove, so the rotating drum connecting part 52 of the expanding piece 5 can be easily installed and disassembled without having to insert and disassemble it from both ends of the rotating drum 2.

[0027] Fixed connection between expansion piece 5 and winding tile 7: The outer end of the rotating drum connecting part 52 on expansion piece 5 is provided with winding tile connecting position 522; the winding tile 6 is provided with winding part 61 and upper wire seat connecting part 62; the inner end of upper wire seat connecting part 62 is provided with expansion piece connecting position 622; the winding tile connecting position 522 and expansion piece connecting position 622 are fixedly connected and define an outer locking groove 524; the inner end of rotating drum connecting part 52 is provided with an inner locking groove 521.

[0028] The movable insertion connection between the expansion plate 5 and the front and rear tapered sleeves: The front tapered sleeve 3 and the rear tapered sleeve 4 have the same structure, both including an annular retaining edge 31, an air cavity 32, and a central shaft hole 33; the central shaft hole 33 is sleeved on the rotating cylinder 2, and the air cavity 32 and the rotating cylinder 2 define a front drive cavity 23 or a rear drive cavity 24; the annular retaining edge 31 is inserted into the inner retaining groove 521 or the outer retaining groove 524. Thus, when compressed air is filled into the front and rear drive cavities 23 / 24, the front and rear tapered sleeves can move axially to the front and rear ends to make the expansion plate 5 and the winding sheath 6 contract synchronously; when the compressed air is removed, the front and rear tapered sleeves can move axially towards each other to make the expansion plate 5 and the winding sheath 6 open synchronously.

[0029] The movable connection between the wire-wound tile 6 and the upper wire seat 7: The upper wire seat 7 is provided with several wire-wound tile connecting grooves 71, and the upper wire seat connecting part 62 of the wire-wound tile 6 is movably assembled in the wire-wound tile connecting grooves 71. Furthermore, the wire-wound tile connecting grooves 71 are straight grooves, so the wire-wound tile 6 can be directly operated radially when disassembling and assembling, without having to insert it from both ends of the upper wire seat 7.

[0030] The connection and assembly relationship of the locking strip 20 is as follows: Locking strip grooves 22 are provided on the inner walls of both sides of the expansion joint groove 21; expansion joint locking positions 523 are provided on both sides of the rotating drum connecting part 52 of the expansion joint 5; winding tile locking positions 621 are provided on both sides of the upper wire seat connecting part 62 of the winding tile 6, and an upper wire seat locking position 72 is provided at the opening of the winding tile connecting groove 71; the locking strip 20 is simultaneously located within the locking strip groove 22, the expansion joint locking position 523, the winding tile locking position 621, and the upper wire seat locking position 72. The locking strip 20 ensures that the expansion joint 5 and the winding tile 6 will not radially detach from the rotating drum 2 and the upper wire seat 7.

[0031] The automatic yarn-changing device with synchronous forced expansion and contraction of the yarn sheet also includes an outer end cover 30, an inner end cap 40, and an inner end cover 50. The outer end cover 30 is disposed on the outer end face of the yarn feeder 7 and is used to enclose the winding tile connecting groove 71; the inner end cap 40 is disposed on the inner end face of the rotating drum 2 and is used to enclose the expansion groove 21. The inner end cover 50 is disposed on the spring seat 8, and the spring seat 8 is disposed on the main shaft 1.

[0032] To achieve the automatic yarn feeding function, the automatic yarn feeding and changing device for non-cut yarn with synchronous forced expansion and contraction of the yarn bobbin also includes a yarn pushing mechanism 60; the yarn pushing mechanism 60 includes a radial yarn pushing rod 610, a yarn pushing piston shaft 620, a return spring 630, and a cylinder head 640; the radial yarn pushing rod 610 includes a central disk 650 and several radial rods 660; the radial rods 660 are arranged on the central disk 650 and extend radially; the front end of the main shaft 1 is provided with a yarn pushing piston chamber 11, and the center of the yarn feeder 7 is provided with a movable chamber 73. The side wall is provided with several yarn pushing channels 74; the cylinder head 640 is provided at the opening of the yarn pushing piston chamber 11, the yarn pushing piston shaft 620 is provided in the yarn pushing piston chamber 11 and the shaft extends out of the cylinder head 640, the return spring 630 is provided in the yarn pushing piston chamber 11 and is located between the piston of the yarn pushing piston shaft 620 and the cylinder head 640; the center plate 650 of the radial yarn pushing rod 610 is provided in the movable cavity 73 and is fixedly connected to the extended end of the yarn pushing piston shaft 620, and the radial rod 660 is provided in the yarn pushing channel 74.

[0033] When the radial pusher rod 610 moves forward, the radial rod 660 can push the transition yarn wound on the upper yarn holder 7 off the upper yarn holder 7 for recycling. As mentioned earlier, if the winding sheath 6 cannot retract automatically, the friction between the transition yarn and the toothed surface of the winding sheath 6 will be very large during yarn pushing, affecting the yarn pushing efficiency. The synchronous automatic extension and retraction of the winding sheath 6 helps to improve the yarn pushing efficiency.

[0034] Air circuit configuration: The main shaft 1 is provided with a tensioning drive air port 12, a pusher rod drive air port 13, and an air delivery channel 14; the air delivery channel 12 is provided with a multi-way air needle 70; the multi-way air needle 70 includes a radial air inlet pipe 710 and an axial air delivery pipe 720; the axial air delivery pipe 720 is sealed to the radial air inlet pipe 710; the front tapered sleeve 3, the rear tapered sleeve 4 and the rotating drum 2 respectively form a front drive chamber 23 and a rear drive chamber 24; the pusher rod drive air port 13 is connected to the radial air inlet pipe 710, and the radial air inlet pipe 710 is connected to the pusher piston chamber 11; the tensioning drive air port 12 is connected to the air delivery channel 14, and the air delivery channel 14 is connected to the front drive chamber 23 and the rear drive chamber 24.

[0035] Principles and operational instructions: Compressed air is supplied through the self-expanding plate drive air port 12 and the yarn pusher drive air port 13. The front cone sleeve 3 and the rear cone sleeve 4 move forward and backward along the main shaft axis respectively, while compressing the front spring 9 and the rear spring 10. The expanding plate 5 and the winding sheath 7 contract synchronously. At this time, the radial yarn pusher 610 moves forward and pushes the transition yarn down the upper yarn seat 7. When the compressed air is disconnected, the front tapered sleeve 3 and the rear tapered sleeve 4 move towards each other along the main shaft axis under the action of the front spring 9 and the rear spring 10, and the expansion plate 5 and the winding tile 7 unfold synchronously; wait for the winding head and the drawing winding.

[0036] The disassembly and assembly method of the above-mentioned automatic yarn feeder with synchronous forced expansion and contraction of the yarn feeder includes the following steps: The assembly steps are as follows: First, fasten the expansion plate and the wire-winding tile together; then, assemble the expansion plate and the wire-winding tile onto the rotating drum and the upper wire seat respectively; then, insert the retaining strip; finally, assemble the outer end cap onto the outer end face of the upper wire seat to complete the sealing and fixing; specifically: First, the expansion piece 5 and the winding tile 6 are fastened together by the winding tile connecting position 522 on the expansion piece 5 and the expansion piece connecting position 622 on the winding tile 6; then, the rotating drum connecting part 52 of the expansion piece 5 is placed into the expansion piece groove 21 on the rotating drum 2, and at the same time, the upper wire seat connecting part 62 of the winding tile 6 is placed into the winding tile connecting groove 71 on the upper wire seat 7; then, the locking strip 20 is inserted into the locking groove 22 of the rotating drum 2, the expansion piece locking position 523 of the expansion piece 5, the winding tile locking position 621 of the winding tile 6, and the upper wire seat locking position 72 of the upper wire seat 7; finally, the outer end cover 30 is assembled onto the outer end face of the upper wire seat 7 to complete the sealing and fixing. The disassembly steps are as follows: First, remove the outer end cover 30 on the outer end face of the upper thread seat 7; then pull out the locking strip 20; then remove the expansion plate 5 and the winding tile 6 respectively from the expansion plate groove 21 and the winding tile connecting groove 71.

[0037] The technical solutions and effects of this application have been described in detail above with reference to the accompanying drawings and specific embodiments. It should be noted that those skilled in the art can develop other embodiments based on this. Any simple modifications and equivalent substitutions that do not depart from the innovative concept of this application are covered by this application and fall within the protection scope of this application.

Claims

1. An automatic yarn-changing device for synchronous forced expansion and contraction of expanding plates, comprising a main shaft (1), a rotating drum (2), a front conical sleeve (3), a rear conical sleeve (4), and a plurality of expanding plates (5); the rotating drum (2) is fixedly mounted on the main shaft (1), the front conical sleeve (3) and the rear conical sleeve (4) are respectively mounted on the front and rear sides of the rotating drum (2), and the expanding plates (5) are movably mounted on the rotating drum (2) with their front and rear ends respectively movably inserted into and connected to the front conical sleeve (3) and the rear conical sleeve (4); characterized in that: It also includes several wire-wound tiles (6), which are fixedly connected to the expansion piece (5).

2. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding sheet according to claim 1, characterized in that: It also includes the upper screw seat (7), the spring seat (8), the front spring (9), and the rear spring (10); The upper wire seat (7) is located on the front side of the front cone sleeve (3) and a front spring (9) is provided between the upper wire seat (7) and the front cone sleeve (3). The spring seat (8) is located on the rear side of the rear cone sleeve (4) and a rear spring (10) is provided between the spring seat (8) and the rear cone sleeve (4). The winding wire tile (6) is movably located on the upper wire seat (7) and its end is fixedly connected to the expansion piece (5).

3. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding sheet according to claim 2, characterized in that: It also includes several card slot strips (20); The rotating drum (2) is provided with a plurality of expansion grooves (21); the inner walls on both sides of the expansion grooves (21) are provided with retaining grooves (22). The expansion piece (5) is provided with an expansion piece body (51) and a rotating drum connecting part (52); the inner end of the rotating drum connecting part (52) is provided with an inner locking groove (521), the outer end of the rotating drum connecting part (52) is provided with a wire winding tile connecting position (522), and the two sides of the rotating drum connecting part (52) are provided with expansion piece locking positions (523). The wire-wound tile (6) is provided with a wire-wound part (61) and an upper wire seat connecting part (62); the upper wire seat connecting part (62) is provided with wire-wound tile locking positions (621) on both sides, and the upper wire seat connecting part (62) is provided with a bulging piece connecting position (622) at the inner end; the wire-wound tile connecting position (522) and the bulging piece connecting position (622) are fixedly connected and define an outer locking groove (524). The upper wire seat (7) is provided with a plurality of wire-winding tile connecting grooves (71), and the groove opening of the wire-winding tile connecting groove (71) is provided with an upper wire seat locking position (72). The rotating drum connecting part (52) of the expansion piece (5) is movably disposed in the expansion piece groove (21), and the upper wire seat connecting part (62) of the winding tile (6) is movably disposed in the winding tile connecting groove (71) of the upper wire seat (7); The locking strip (20) is simultaneously disposed in the expansion piece locking position (523), the winding tile locking position (621), and the upper wire seat locking position (72); The front conical sleeve (3) and the rear conical sleeve (4) are respectively fitted into the outer locking groove (524) and the inner locking groove (521).

4. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding plate according to claim 3, characterized in that: It also includes an outer end cap (30) and an inner end cap (40); The outer end cap (30) is disposed on the outer end face of the upper wire seat (7) and is used to encapsulate the wire winding tile connecting groove (71). The inner sealing plate (40) is disposed on the inner end face of the rotating cylinder (2) and is used to encapsulate the expansion groove (21).

5. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding sheet according to claim 3, characterized in that: It also includes an inner end cap (50); The inner end cap (50) is disposed on the spring seat (8); The spring seat (8) is mounted on the main shaft (1).

6. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding plate according to claim 3, characterized in that: It also includes a yarn pushing mechanism (60); The yarn pushing mechanism (60) includes a radial yarn pushing rod (610), a yarn pushing piston shaft (620), a return spring (630), and a cylinder head (640); the radial yarn pushing rod (610) includes a central disk (650) and a plurality of radial rods (660); the radial rods (660) are disposed on the central disk (650) and extend radially; The front end of the main shaft (1) is provided with a yarn pushing piston cavity (11), and the center of the upper yarn seat (7) is provided with a movable cavity (73). The side wall of the movable cavity (73) is provided with a number of yarn pushing channels (74). The cylinder head (640) is disposed at the opening of the yarn pushing piston chamber (11), the yarn pushing piston shaft (620) is disposed in the yarn pushing piston chamber (11) and the shaft extends out of the cylinder head (640), and the return spring (630) is disposed in the yarn pushing piston chamber (11) and located between the piston of the yarn pushing piston shaft (620) and the cylinder head (640); The central disc (650) of the radial pusher rod (610) is disposed in the movable cavity (73) and fixedly connected to the extended end of the pusher piston shaft (620), and the radial rod (660) is disposed in the pusher channel (74).

7. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding sheet according to claim 6, characterized in that: The main shaft (1) is provided with a sheet-expanding drive air port (12), a yarn pusher drive air port (13), and an air delivery channel (14). The gas delivery channel (12) is equipped with multiple gas needles (70); The multi-channel air needle (70) includes a radial air inlet tube (710) and an axial air delivery tube (720); the axial air delivery tube (720) is sealed to the radial air inlet tube (710). A front drive cavity (23) and a rear drive cavity (24) are respectively formed between the front conical sleeve (3), the rear conical sleeve (4) and the rotating cylinder (2). The yarn pushing drive air port (13) is connected to the radial air inlet pipe (710), and the radial air inlet pipe (710) is connected to the yarn pushing piston chamber (11). The expansion plate driving air port (12) is connected to the air supply channel (14), and the air supply channel (14) is connected to the front driving chamber (23) and the rear driving chamber (24).

8. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding sheet according to claim 6, characterized in that: The expansion groove (21) and the wire-wound tile connecting groove (71) are both straight grooves.

9. The automatic yarn-changing device with synchronous forced expansion and contraction of the expanding plate according to claim 1, characterized in that: The front conical sleeve (3) and the rear conical sleeve (4) have the same structure, both including an annular snap-fit ​​edge (31), an air cavity (32), and a central shaft hole (33). The central shaft hole (33) is sleeved on the rotating cylinder (2), and the air chamber (32) and the rotating cylinder (2) define a front drive chamber (23) or a rear drive chamber (24). The annular card insert edge (31) is inserted into the inner card insert groove (521) or the outer card insert groove (524).

10. A method for disassembling and assembling an automatic yarn-changing device with synchronous forced expansion and contraction of the yarn sheet, comprising: Assembly steps: First, fasten the expansion piece (5) and the wire winding tile (6) into one piece; then, assemble the expansion piece (5) and the wire winding tile (6) onto the rotating drum (2) and the upper wire seat (7) respectively; then, insert the locking strip (20); finally, assemble the outer end cover (30) onto the outer end face of the upper wire seat (7) to complete the sealing and fixing. The disassembly steps are as follows: first, remove the outer end cover (30) on the outer end face of the upper wire seat (7); then pull out the locking strip (20); then take out the expansion plate (5) and the wire winding tile (6) respectively from the expansion plate groove (21) and the wire winding tile connecting groove (71).

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