FDY polyester semi-lustrous double-twisted yarn doubling and twisting machine with tensioning device

Abstract

The utility model relates to a FDY polyester semi -light double -twist silk double twister with tensioning device relates to textile machinery technical field, including the casing and install in the silk thread guide roller for silk thread guidance of casing, the utility model has the advantages of: equipment through the double structure of tensioning roller and spring, cam two and volute spring, accurate control silk thread tension, automatic buffer tightness change, silk thread groove prevents deviation, ensures that the stress is even, reduces the twist uneven and broken line, promotes product quality, the counterweight can be freely connected, the hydraulic rod fast switching tensioning state, cooperation sliding connection and guide structure, adapt to different silk thread, reduce the adjustment time, improve the efficiency, when broken line cam clamping broken line prevents entanglement, spring and counterweight adjustment reduce the risk of breakage, guarantee equipment and personnel safety, reduce the loss of downtime.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, and in particular to an FDY polyester semi-dull retwisting machine with a tensioning device. Background Technology

[0002] In the textile industry, FDY semi-dull twisted polyester yarn has become one of the important textile raw materials due to its excellent physical properties and wide range of applications. During its processing, the twisting operation is a key step that determines the quality of the final product, and the doubling machine, as the core equipment for achieving this operation, plays an irreplaceable role.

[0003] Due to its unique "one-turn two-twist" working principle, the double twister can significantly improve twisting efficiency and effectively shorten the production cycle compared with traditional twisting equipment. At the same time, its increased roll capacity can realize continuous production of tens of thousands of meters without joints, greatly reducing quality fluctuations caused by joint treatment, and the twisting quality is also significantly improved. Therefore, it is widely used in the processing of FDY polyester semi-dull double twisted yarn.

[0004] However, in the actual twisting process of FDY semi-dull polyester retwisted yarn, existing doubling machines have gradually revealed a series of technical problems that urgently need to be solved. FDY semi-dull polyester retwisted yarn itself has a special molecular structure and physical properties, such as a high elastic modulus and a specific coefficient of friction, which makes the yarn extremely sensitive to changes in the external environment and equipment operating parameters during the twisting process.

[0005] Specifically, yarn tension is highly susceptible to instability due to a combination of factors. These factors include, but are not limited to: deviations in the yarn's linear density, fluctuations in the pre-tension of the raw yarn, speed changes during twisting, wear on the equipment's guide components, and subtle changes in ambient temperature and humidity. When yarn tension becomes unstable, the direct consequence is uneven twist distribution, severely affecting the evenness and mechanical properties of FDY semi-dull retwisted polyester yarn, thereby reducing the quality stability of subsequent woven products. More seriously, a sudden increase in tension may cause yarn breakage, increasing raw material waste and requiring machine downtime for splicing, significantly extending production downtime and reducing overall production efficiency.

[0006] Further analysis reveals significant limitations in the tension adjustment mechanisms of existing doubling machines. Their adjustment methods are often simplistic, with limited range and insufficient precision. They cannot flexibly and accurately adapt to the differences in raw yarn quality (such as breaking strength and elongation) between different batches of FDY polyester semi-dull retwisted yarn, or to the processing requirements of products with different specifications (such as linear density and twist direction). This lack of adjustment capability makes it difficult for the equipment to maintain stable twisting quality under complex and variable production conditions, becoming a key bottleneck restricting the technological upgrading of FDY polyester semi-dull retwisted yarn processing. Utility Model Content

[0007] To overcome the technical defects of existing technologies, this utility model provides an FDY polyester semi-dull retwisting machine with a tensioning device. Through a dual structure of tension roller and spring, and cam and coil spring, it precisely controls yarn tension, automatically buffers tension changes, prevents yarn deviation through yarn grooves, ensures uniform force distribution, reduces uneven twist and yarn breakage, and improves product quality. The counterweights can be freely connected in series, and the hydraulic rod quickly switches the tension state. Combined with the sliding connection and guide structure, it adapts to different yarns, reduces adjustment time, and improves efficiency. In case of yarn breakage, the cam clamps the broken yarn to prevent tangling, and the spring and counterweight adjustment reduce the risk of breakage, ensuring equipment and personnel safety and reducing downtime losses. The technical solution adopted by this utility model is: an FDY polyester semi-dull retwisting yarn doubling machine with a tensioning device includes a machine cover and yarn guide rollers installed inside the machine cover for guiding the yarn; The machine housing contains a U-shaped frame, and at the bottom of the U-shaped frame is a tensioning roller for tensioning the yarn. Rotary sliders are rotatably connected to both ends of the tensioning roller. A T-shaped rod is slidably connected within a blind hole on the surface of the rotary slider. One end of the T-shaped rod is connected to the U-shaped frame, and a spring is fitted onto the outer surface of the T-shaped rod to apply pressure to the tensioning roller. One end of the spring abuts against the surface of the rotary slider and the bottom of the U-shaped frame. The elastic force pushes the rotary slider, causing the tensioning roller to apply continuous pressure to the yarn. The elastic properties of the spring allow the tensioning roller to automatically adapt to changes in yarn tension. When the yarn is slack, the spring pushes the tensioning roller to apply pressure; when the yarn is too tight, the spring contracts to buffer the pressure, thereby stabilizing the yarn tension, reducing the risk of breakage, and ensuring the continuity of the twisting process.

[0008] Furthermore, the surfaces of both the yarn guide roller and the tension roller are provided with yarn grooves for limiting and guiding the yarn. The yarn grooves on the surfaces of the yarn guide roller and the tension roller are adapted to the diameter of the FDY polyester semi-dull retwisted yarn. The yarn is embedded in the grooves for transmission. The grooves limit the yarn and prevent the yarn from shifting left or right or slipping during transmission and tensioning. This ensures that the yarn always runs along the preset path, improving twisting accuracy and product consistency.

[0009] Preferably, a strip slider is fixed to the bottom of the U-shaped frame, and a strip groove is formed on the surface of the rotating slider. The rotating slider is slidably connected to the bottom of the U-shaped frame through the strip slider and the strip groove, so that the rotating slider can slide along the bottom of the U-shaped frame. This allows the tensioning roller to adapt more flexibly to changes in yarn tension, avoids local stress concentration caused by fixed position, further protects the yarn and improves tension stability.

[0010] Preferably, a limiting slide rod is slidably connected to the top surface of the machine cover. One end of the limiting slide rod is fixedly installed on the surface of the U-shaped frame to restrict the movement direction of the U-shaped frame, ensuring that the U-shaped frame can only move up and down in the vertical direction, avoiding tilting or deviation during operation, ensuring that the pressure of the tension roller on the yarn is uniform and stable, and maintaining the stability of the overall structure.

[0011] Preferably, the side wall of the machine cover is provided with a strip groove, and an L-shaped slide rod is slidably connected in the strip groove. One end of the L-shaped slide rod is fixedly installed on one side of the U-shaped frame, and a counterweight is provided at the other end of the L-shaped slide rod. A hydraulic rod is installed at the bottom of the inner side of the strip groove, and an abutment plate is installed at the piston end of the hydraulic rod. The piston end of the hydraulic rod extends out to control the abutment plate to push the L-shaped slide rod, causing the tensioning roller to move away from the surface of the yarn and release the tension on the yarn. Conversely, it causes the tensioning roller to press down on the surface of the yarn to tension the yarn. The weight of the counterweight is transmitted to the U-shaped frame through the L-shaped slide rod, increasing the pressure of the tensioning roller. The hydraulic rod can push the abutment plate to lift the L-shaped slide rod and release the tension. The weight of the counterweight can enhance the tension force, which is suitable for yarns with high tension requirements. The controllability of the hydraulic rod enables rapid switching of the tension state.

[0012] Preferably, a hook is installed on the surface of the counterweight, and a lifting ring is installed on the bottom surface of the counterweight. The counterweight is detachably installed at the bottom of one end of the L-shaped slide rod via the hook. Multiple counterweights can be connected in series according to different specifications of yarn. The counterweights are connected to the L-shaped slide rod via hooks, and the counterweights can be connected in series via hooks and lifting rings to achieve flexible adjustment of the total counterweight. Operators can quickly increase or decrease the number of counterweights according to the tension requirements of different specifications of yarn, and accurately adjust the tension, making the equipment suitable for processing various types of FDY polyester semi-dull retwisted yarn, thus improving the versatility of the equipment.

[0013] Preferably, the inside of the machine cover is equipped with a first fixing rod and a second fixing rod. Multiple first cams are evenly spaced on the surface of the first fixing rod, and multiple second cams are evenly spaced on the surface of the second fixing rod. The multiple second cams are rotatably connected to the surface of the second fixing rod. A coil spring is installed on the surface of the second cam, and the other end of the coil spring is fixedly installed on the surface of the second fixing rod. When the thread overlaps the second cam, it drives the coil spring to rotate, causing the coil spring to wind up and store energy. The energy storage of the coil spring generates additional tension on the thread, which, in conjunction with the tensioning roller, forms double tension, further enhancing tension stability and laying the foundation for the thread breakage protection function.

[0014] Preferably, both cam one and cam two have grooves on their surfaces, and the number of grooves is the same and their positions correspond one-to-one. The wire overlaps the surface of cam two, causing the coil spring to wind up and store energy, further achieving tension on the wire. When the wire breaks, the coil spring, which has stored energy, causes the corresponding cam two to rotate towards the side of cam one, clamping the broken wire. The grooves on the surfaces of cam one and cam two can clamp the wire. During normal operation, the wire drives cam two to rotate, causing the coil spring to store energy. After the wire breaks, the coil spring releases energy, causing cam two to rotate towards cam one. The grooves of both close and clamp the broken wire. The double tensioning design significantly improves tension stability. Automatic clamping of the broken wire when it breaks can prevent the wire from drifting randomly, avoid entanglement with equipment parts, reduce troubleshooting time, and improve production safety and continuity.

[0015] The beneficial effects of this invention are: precise control of yarn tension is achieved through the synergistic effect of multiple structures. The tensioning roller applies continuous pressure to the yarn with the help of the elastic force of the spring, which can automatically buffer the changes in yarn tension. The auxiliary tensioning structure composed of cam two and coil spring forms double tension, which further enhances tension stability. At the same time, the yarn grooves on the surface of the yarn guide roller and the tensioning roller effectively prevent yarn deviation, ensuring that the yarn is subjected to uniform force during twisting, significantly reducing problems such as uneven twist and yarn breakage caused by tension fluctuations, and greatly improving the product quality and consistency of FDY polyester semi-dull retwisted yarn. The counterweight blocks connected by the L-shaped slide bar can be freely connected in series with the hook and the lifting ring. Operators can quickly increase or decrease the counterweight according to the tension requirements of different specifications of wires, accurately matching the processing requirements. The cooperation between the hydraulic rod and the abutment plate enables quick switching of the tension state, which facilitates the start-up, shutdown, wire change and maintenance of the equipment. In addition, the sliding connection between the rotating slider and the U-shaped frame, the guiding function of the limit slide bar and other structural designs make the equipment more stable and reliable when adapting to different wire processing, effectively reducing adjustment time and improving overall production efficiency. When the wire breaks, the coil spring releases energy to rotate the cam from cam two to cam one. The two cams clamp the broken wire through surface grooves, preventing the broken wire from drifting and entangled in equipment parts, thus avoiding the escalation of the fault. At the same time, the buffering effect of the spring and the controllable pressure adjustment of the counterweight reduce the risk of wire breakage due to excessive stretching, thereby reducing safety hazards during equipment operation. These designs not only protect equipment parts but also create a safer working environment for operators and reduce downtime losses caused by fault handling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of a partial internal structure of the cover of this utility model.

[0018] Figure 3 This utility model Figure 2 A side view structural diagram.

[0019] Figure 4 This is a schematic diagram of the tension roller, U-shaped frame, and L-shaped slide bar structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the strip-shaped bar, T-shaped bar, and rotating slider structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the abutment plate, hydraulic rod, and hook structure of this utility model.

[0022] Figure 7 This is a schematic diagram of the structure of cam one and cam two of this utility model.

[0023] Figure 8 This is a schematic diagram of the coil spring, cam one, and cam two of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Machine cover; 2. Wire guide roller; 3. U-shaped frame; 4. Tension roller; 5. Limiting slide bar; 6. Strip groove; 7. L-shaped slide bar; 8. Counterweight; 9. Rotating slider; 10. Strip groove; 11. Strip slider; 12. T-shaped rod; 13. Spring; 14. Wire groove; 15. Hydraulic rod; 16. Abutment plate; 17. Hook; 18. Lifting ring; 19. Fixed rod one; 20. Cam one; 21. Cam two; 22. Fixed rod two; 23. Coil spring. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings: As shown in the figure, this embodiment provides an FDY polyester semi-dull retwisting machine with a tensioning device, including a machine cover 1 and a yarn guide roller 2 installed inside the machine cover 1 for guiding the yarn. A U-shaped frame 3 is installed inside the machine cover 1. A tensioning roller 4 for tensioning the yarn is installed at the bottom of the U-shaped frame 3. Both ends of the tensioning roller 4 are rotatably connected to a rotating slider 9. A T-shaped rod 12 is slidably connected in a blind hole on the surface of the rotating slider 9. One end of the T-shaped rod 12 is connected to the U-shaped frame 3. A spring 13 for applying pressure to the tensioning roller 4 is sleeved on the outer surface of the T-shaped rod 12. One end of the spring 13 abuts against the surface of the rotating slider 9 and the other end of the spring 13 abuts against the bottom of the U-shaped frame 3.

[0026] The yarn guide roller 2 is responsible for guiding the yarn transmission path. The U-shaped frame 3 is the support frame of the tensioning device. The tensioning roller 4 at the bottom of the U-shaped frame directly contacts the yarn to achieve tension. The rotating sliders 9 at both ends of the tensioning roller 4 can slide along the T-shaped rod 12. The spring 13 outside the T-shaped rod 12 is in a compressed state. The elastic force pushes the rotating slider 9, so that the tensioning roller 4 applies continuous pressure to the yarn. The elastic characteristics of the spring 13 enable the tensioning roller 4 to automatically adapt to changes in yarn tension. When the yarn is slack, the spring 13 pushes the tensioning roller 4 to apply pressure. When the yarn is too tight, the spring 13 contracts to buffer the pressure, thereby stabilizing the yarn tension, reducing the risk of breakage, and ensuring the continuity of the twisting process.

[0027] Furthermore, both the wire guide roller 2 and the tension roller 4 have wire grooves 14 on their surfaces for limiting and guiding the wire.

[0028] A yarn groove 14, which is adapted to the diameter of FDY semi-dull retwisted polyester yarn, is opened on the surface of the yarn guide roller 2 and the tension roller 4. The yarn is embedded in the groove for transmission. The groove limits the yarn and prevents the yarn from shifting left or right or slipping during transmission and tensioning. This ensures that the yarn always runs along the preset path, improving twisting accuracy and product consistency.

[0029] Furthermore, a strip slider 11 is fixed to the bottom of the U-shaped frame 3, and a strip groove 10 is provided on the surface of the rotating slider 9. The rotating slider 9 is slidably connected to the bottom of the U-shaped frame 3 through the strip slider 11 and the strip groove 10.

[0030] The strip slider 11 at the bottom of the U-shaped frame 3 and the strip groove 10 of the rotating slider 9 form a sliding connection, allowing the rotating slider 9 to slide along the bottom of the U-shaped frame 3. This allows the tension roller 4 to adapt more flexibly to changes in yarn tension, avoid local stress concentration caused by fixed position, further protect the yarn and improve tension stability.

[0031] Furthermore, a limiting slide rod 5 is slidably connected to the top surface of the cover 1, and one end of the limiting slide rod 5 is fixedly installed on the surface of the U-shaped frame 3.

[0032] One end of the limiting slide bar 5 is fixed to the U-shaped frame 3, and the other end is slidably connected to the top of the machine cover 1. This restricts the movement direction of the U-shaped frame 3, ensuring that the U-shaped frame 3 can only move up and down in the vertical direction, preventing it from tilting or shifting during operation, ensuring that the tensioning roller 4 applies uniform and stable pressure to the yarn, and maintaining the stability of the overall structure.

[0033] Furthermore, a strip groove 6 is provided on the side wall of the machine cover 1. An L-shaped slide rod 7 is slidably connected in the strip groove 6. One end of the L-shaped slide rod 7 is fixedly installed on one side of the U-shaped frame 3. A counterweight block 8 is provided at the other end of the L-shaped slide rod 7. A hydraulic rod 15 is installed at the bottom of the inner side of the strip groove 6. An abutment plate 16 is installed at the piston end of the hydraulic rod 15. The piston end of the hydraulic rod 15 extends out to control the abutment plate 16 to push the L-shaped slide rod 7, causing the tension roller 4 to move away from the surface of the yarn and release the tension on the yarn. Conversely, it causes the tension roller 4 to press down on the surface of the yarn to tension the yarn.

[0034] The strip groove 6 on the side wall of the machine cover 1 provides a sliding track for the L-shaped slide rod 7. The L-shaped slide rod 7 connects the U-shaped frame 3 and the counterweight 8. The weight of the counterweight 8 is transmitted to the U-shaped frame 3 through the L-shaped slide rod 7, increasing the pressure of the tension roller 4. The hydraulic rod 15 can push the abutment plate 16 to lift the L-shaped slide rod 7 and release the tension. The weight of the counterweight 8 can enhance the tension force, which is suitable for yarns with high tension requirements. The controllability of the hydraulic rod 15 enables rapid switching of the tension state.

[0035] Furthermore, a hook 17 is installed on the surface of the counterweight 8, and a lifting ring 18 is installed on the bottom surface of the counterweight 8. The counterweight 8 is detachably installed at the bottom of one end of the L-shaped slide rod 7 via the hook 17. Multiple counterweights 8 can be connected in series according to different specifications of wire. The counterweight 8 is connected to the L-shaped slide rod 7 via the hook 17, and the counterweights 8 can be connected in series with each other via the hook 17 and the lifting ring 18.

[0036] The total amount of counterweight can be flexibly adjusted. Operators can quickly increase or decrease the number of counterweights 8 according to the tension requirements of different specifications of yarn, and accurately adjust the tension. This makes the equipment suitable for processing various types of FDY polyester semi-dull retwisted yarn, thus improving the equipment's versatility.

[0037] Furthermore, the inside of the cover 1 is equipped with a fixing rod 19 and a fixing rod 22. Multiple cams 20 are installed at equal intervals on the surface of the fixing rod 19, and multiple cams 21 are installed at equal intervals on the surface of the fixing rod 22. The multiple cams 21 are rotatably connected to the surface of the fixing rod 22. A coil spring 23 is installed on the surface of the cam 21, and the other end of the coil spring 23 is fixedly installed on the surface of the fixing rod 22.

[0038] Cam 20 of fixed rod 19 corresponds one-to-one with cam 21 of fixed rod 22. Cam 21 is connected to fixed rod 22 via spring 23. When the thread is attached to cam 21, it rotates, causing spring 23 to wind up and store energy. The energy storage of spring 23 generates additional tension on the thread, which, together with tension roller 4, forms double tension, further enhancing tension stability and laying the foundation for the thread breakage protection function.

[0039] Furthermore, both cam 1 20 and cam 21 have grooves on their surfaces, and the number of grooves is the same and their positions correspond one to one. The wire overlaps the surface of cam 21, causing the coil spring 23 to wind up and store energy, and further achieve tension on the wire. When the wire breaks, the coil spring 23, which has wound up and stored energy, causes the corresponding cam 21 to rotate toward the side of cam 1 20, clamping the broken wire.

[0040] The grooves on the surfaces of cam 1 20 and cam 2 21 can hold the wire. During normal operation, the wire drives cam 2 21 to rotate, causing the coil spring 23 to store energy. After the wire breaks, the coil spring 23 releases energy, causing cam 2 21 to rotate toward cam 1 20. The grooves of both close and clamp the broken wire. The double tension design significantly improves tension stability. When the wire breaks, the automatic clamping of the broken wire can prevent the wire from drifting randomly, avoid entanglement with equipment parts, reduce troubleshooting time, and improve production safety and continuity.

[0041] The working principle of this utility model is as follows: both ends of the tension roller 4 are rotatably connected to a rotating slider 9. The rotating slider 9 can rotate flexibly relative to the tension roller 4, ensuring that the tension roller 4 can rotate freely with the transmission of the wire when tensioning the wire, thereby reducing wear on the wire. In its natural state, spring 13 is compressed, which exerts a downward force on the rotating slider 9. This force is then transmitted to the tension roller 4, causing the tension roller 4 to apply pressure to the thread, thus achieving thread tensioning. When the thread tension changes, such as when the thread becomes loose, spring 13 will extend further, pushing the tension roller 4 downward to increase the pressure on the thread and re-tension it. When the thread tension is too high, the thread will push the tension roller 4 upward to compress spring 13, thereby reducing the pressure on the thread and preventing it from breaking due to excessive tension. A strip slider 11 is fixed at the bottom of the U-shaped frame 3. A strip groove 10 is provided on the surface of the rotating slider 9. The rotating slider 9 is slidably connected to the bottom of the U-shaped frame 3 through the strip slider 11 and the strip groove 10. This sliding connection method allows the rotating slider 9 to slide within a certain range along the direction of the strip groove 10 at the bottom of the U-shaped frame 3. Combined with the up and down movement of the tension roller 4, it can better adapt to the changes in the tension of the yarn and ensure the stability of the tensioning effect. The limiting slide bar 5 limits and guides the movement of the U-shaped frame 3, so that the U-shaped frame 3 can only move along the sliding direction of the limiting slide bar 5, ensuring the positional stability of the U-shaped frame 3 and the tensioning roller 4 and other components installed on it, and avoiding deviation during operation that would affect the tensioning effect on the yarn. The counterweight 8 exerts a downward pulling force on the L-shaped slide bar 7 through its own weight. This, in turn, causes the U-shaped frame 3 to move downwards via the L-shaped slide bar 7, increasing the pressure of the tension roller 4 on the yarn and enhancing the tensioning effect. The counterweight 8 is detachably mounted on one end of the L-shaped slide bar 7 via a hook 17. This detachable mounting method allows operators to easily increase or decrease the number of counterweights 8 according to the tension requirements of different yarn specifications. Multiple counterweights 8 can be connected in series according to different yarn specifications. By changing the total weight of the counterweights 8, the pulling force on the L-shaped slide bar 7 can be adjusted, thereby adjusting the pressure of the tension roller 4 on the yarn and achieving precise tensioning of yarns of different specifications. A hydraulic rod 15 is installed at the bottom of the inner side of the strip groove 6, and an abutment plate 16 is installed at the piston end of the hydraulic rod 15. When it is necessary to release the tension of the yarn, the piston end of the hydraulic rod 15 is extended, pushing the abutment plate 16 to move upward. The abutment plate 16 then pushes the L-shaped slide rod 7 to slide upward in the strip groove 6. The L-shaped slide rod 7 drives the U-shaped frame 3 to move upward, causing the tension roller 4 to move away from the surface of the yarn, thereby releasing the tension of the yarn. Conversely, when it is necessary for the tension roller 4 to press down on the surface of the yarn to tension the yarn, the piston end of the hydraulic rod 15 is retracted, and the L-shaped slide rod 7 slides downward under the gravity of the counterweight 8, driving the U-shaped frame 3 to move downward, so that the tension roller 4 presses down on the surface of the yarn again. Both cam 1 20 and cam 21 have grooves on their surfaces, and the number of grooves is the same and their positions correspond one to one. During normal operation, the wire overlaps the surface of cam 21. The tension of the wire will cause cam 21 to rotate to a certain extent, causing coil spring 23 to wind up and store energy. The elastic force of coil spring 23 reacts to cam 21, generating a pulling force on the wire, further achieving tensioning of the wire and enhancing the overall tensioning effect. When the thread breaks, the tension of the thread on cam 21 disappears, and the coil spring 23 that stores energy releases energy, causing cam 21 to rotate toward cam 20. Finally, cam 20 and cam 21 work together to clamp the broken thread, preventing it from drifting and interfering with the normal operation of the equipment. This also makes it easier for operators to handle and reconnect the broken thread.

[0042] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A FDY polyester semi-dull retwisting machine with a tensioning device, comprising a machine cover (1) and a yarn guide roller (2) installed inside the machine cover (1) for guiding the yarn. Its features are: A U-shaped frame (3) is provided inside the machine cover (1). A tensioning roller (4) for tensioning the yarn is provided at the bottom of the U-shaped frame (3). A rotating slider (9) is rotatably connected to both ends of the tensioning roller (4). A T-shaped rod (12) is slidably connected in a blind hole on the surface of the rotating slider (9). One end of the T-shaped rod (12) is connected to the U-shaped frame (3). A spring (13) for applying pressure to the tensioning roller (4) is sleeved on the outer surface of the T-shaped rod (12). One end of the spring (13) abuts against the surface of the rotating slider (9), and the other end of the spring (13) abuts against the bottom of the U-shaped frame (3).

2. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: Both the wire guide roller (2) and the tension roller (4) have wire grooves (14) on their surfaces for limiting and guiding the wire.

3. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: The bottom of the U-shaped frame (3) is fixed with a strip slider (11), and the surface of the rotating slider (9) is provided with a strip groove (10). The rotating slider (9) is slidably connected to the bottom of the U-shaped frame (3) through the strip slider (11) and the strip groove (10).

4. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: A limiting slide rod (5) is slidably connected to the top surface of the cover (1), and one end of the limiting slide rod (5) is fixedly installed on the surface of the U-shaped frame (3).

5. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: The side wall of the machine cover (1) is provided with a strip groove (6), and an L-shaped slide rod (7) is slidably connected in the strip groove (6). One end of the L-shaped slide rod (7) is fixedly installed on one side of the U-shaped frame (3), and a counterweight (8) is provided at the other end of the L-shaped slide rod (7). A hydraulic rod (15) is installed at the bottom of the inner side of the strip groove (6). An abutment plate (16) is installed at the piston end of the hydraulic rod (15). The piston end of the hydraulic rod (15) extends out to control the abutment plate (16) to push the L-shaped slide rod (7), causing the tension roller (4) to move away from the surface of the wire to release the tension on the wire. Conversely, it causes the tension roller (4) to press down on the surface of the wire to tension the wire.

6. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: The surface of the counterweight (8) is equipped with a hook (17), and the bottom surface of the counterweight (8) is equipped with a lifting ring (18). The counterweight (8) is detachably installed at the bottom of one end of the L-shaped slide bar (7) through the hook (17). Multiple counterweights (8) can be connected in series according to different specifications of wire.

7. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 1, characterized in that: Inside the housing (1), there are fixed rod one (19) and fixed rod two (22). Multiple cam one (20) are installed at equal intervals on the surface of fixed rod one (19), and multiple cam two (21) are installed at equal intervals on the surface of fixed rod two (22). Multiple cam two (21) are rotatably connected to the surface of fixed rod two (22). A coil spring (23) is installed on the surface of cam two (21), and the other end of the coil spring (23) is fixedly installed on the surface of fixed rod two (22).

8. The FDY polyester semi-dull retwisting machine with a tensioning device according to claim 7, characterized in that: The surfaces of both cam one (20) and cam two (21) are provided with grooves, and the number of grooves is the same and their positions correspond one to one. The wire overlaps the surface of cam two (21) to cause the coil spring (23) to wind up and store energy, and further achieve tension on the wire. When the wire breaks, the coil spring (23) that has wound up and stored energy causes the corresponding cam two (21) to rotate to the side of cam one (20) to clamp the broken wire.

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