Constant tension pay-off for polyester cord

Abstract

The application discloses a kind of constant tension pay-off devices of polyester string, belong to polyester line production equipment technical field, including machine body, still including pay-off mechanism, including the I-beam wheel being set in the inside of machine body, the outside wall of I-beam wheel is wound with line body, the top of machine body is provided with support, support top is provided with lead block, the top of lead block is fixedly installed with front fixed frame and rear fixed frame.The application, in pay-off processing, the stress of the release of the twist torque of line body is detected, the tension roller is controlled to swing in specified angle range, in the process of tension roller reset, the force with line body is increased by the extension of movable block, the line body is rotated and untwisted when tension roller resets, and different degrees of untwisting operation are carried out according to the twist of line body, so as to avoid the problems such as line body kink, arching, etc., significantly improve the flatness and stability of subsequent processing of line body and the uniformity of subsequent impregnation or composite process.

Description

Technical Field

[0001] This invention relates to the field of polyester thread production equipment technology, and more specifically, to a constant tension thread feeding device for polyester thread. Background Technology

[0002] In the industrial processing of polyester ropes, such as when used as a reinforcing material in rubber products or composite materials, it is usually necessary to unload the rope from a reel. Current technology generally employs a constant tension unloading device, the core of which lies in controlling the output of a brake or motor through feedback from a floating lever or sensor to maintain stable rope tension and prevent rope breakage or slack caused by changes in the reel diameter and speed fluctuations. This technology is fundamental to ensuring the smooth entry of the rope into subsequent processes such as impregnation and molding.

[0003] However, in the existing technology of wire laying, the polyester rope released from the H-beam reel often has inherent twist. This twist will cause the rope to have a strong twisting tendency, which will lead to problems such as kinking and arching. This will not only destroy the stability of the tension and cause instantaneous tension peaks, but also make the rope unable to be laid straight, which will seriously affect the uniformity of subsequent impregnation and the adhesion effect with the base material, ultimately reducing the fatigue life and reliability of the product.

[0004] How to invent a constant tension wire feeding device for polyester cord to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a constant tension wire feeding device for polyester cord, which aims to improve the problems mentioned in the background art.

[0006] This invention is implemented as follows:

[0007] The present invention provides a constant tension wire feeding device for polyester cord, including a machine body and a wire feeding mechanism, including an I-beam reel disposed inside the machine body, with a wire wound on the outer side wall of the I-beam reel, a bracket disposed on the top of the machine body, a wire guide block disposed on the top of the bracket, a front fixed frame and a rear fixed frame fixedly mounted on the top of the wire guide block, and a front guide roller and a rear guide roller respectively rotatably connected to the front fixed frame and the rear fixed frame.

[0008] The tension mechanism includes a movable frame sleeved on the top of the lead block, a spring between the movable frame and the lead block, and a tension roller inside the movable frame. The wire extends out from the side wall of the I-beam reel and passes through the side walls of the front guide roller, the tension roller and the rear guide roller in sequence.

[0009] The untwisting mechanism includes a first transmission roller and a second transmission roller disposed inside the movable frame. A motor is disposed on the side wall of the movable frame and is connected to the first transmission roller. The first transmission roller and the second transmission roller are connected by gear transmission. Both ends of the tension roller are fitted with connecting rollers. The section of the connecting roller away from the tension roller is connected to a slider through a set of rotating shafts and spherical hinge shafts. The slider is fitted with the movable frame in a vertically limited movement. Both ends of the second transmission roller are connected to turntables. The tops of the sliders on both sides are connected to connecting rods through spherical hinge shafts. The end of the connecting rod away from the slider is rotatably connected to the side wall of the turntable through a rotating shaft. The tension roller is provided with a drive assembly for driving the tension roller to swing. The tension roller is also provided with a hydraulic assembly for changing the transmission resistance between the tension roller and the yarn.

[0010] The testing mechanism includes a support frame set on top of the lead block, a sleeve movably sleeved on top of the support frame, a limit tube set on top of the sleeve, a spring between the limit tube and the support frame, a movable tube rotatably connected inside the limit tube, the wire passes through the movable tube, and the twist of the wire before passing the front fixed frame is detected by the transmission between the wire and the movable tube.

[0011] The stretching mechanism includes a front drive wheel rotatably connected to the side wall of the front fixed frame and a rear drive wheel rotatably connected to the side wall of the rear fixed frame. The front drive wheel is coaxially connected to the front guide roller, and the rear drive wheel is coaxially connected to the rear fixed frame.

[0012] Preferably, the diameter of the front drive wheel is larger than the diameter of the rear drive wheel, and the front drive wheel and the rear drive wheel are connected by a drive belt.

[0013] Preferably, the drive assembly includes a transmission gear disposed at the center of the tension roller, and the end of the connecting roller extending into the tension roller is provided with teeth that mesh with the transmission gear.

[0014] Preferably, the hydraulic assembly includes a sealed cavity and a buffer cavity that are opened inside the tension roller and are interconnected. A hydraulic transmission medium is provided between the sealed cavity and the buffer cavity. A sealing block that cooperates with the sealed cavity is provided on the side wall of the connecting roller. A piston block is sleeved inside the buffer cavity. A spring is provided between the piston block and the buffer cavity. A connecting pipe is opened inside the tension roller. A valve block that controls the connection between the buffer cavity and the connecting pipe is sleeved inside the buffer cavity. A groove that cooperates with the line body is provided on the outer side wall of the tension roller in the sealed cavity for guiding and positioning the line body. Multiple sets of arc-shaped movable blocks are sleeved on the inner side of the groove. One end of the tension roller can extend out from the inside of the groove of the tension roller, and the other end of the tension roller is connected to the connecting pipe.

[0015] Preferably, the valve block has two sets of limiting protrusions that cooperate with the piston block on the side close to the piston block, and the valve block has a connecting groove that cooperates with the connecting pipe.

[0016] Preferably, the connecting rods connected to the two sliders are of different lengths. When the tension roller is in the initial horizontal state, the top of one connecting rod is at the lowest position when it is connected to the turntable, while the top of the other connecting rod is at the highest position when it is connected to the turntable on the corresponding side.

[0017] Preferably, the outer wall of the movable tube is provided with a set of guide plates one, and the inner wall of the limiting tube is provided with a ring of guide plates two distributed in a circular pattern, with guide plates one and guide plates two cooperating with each other.

[0018] Preferably, the inner wall of the movable tube is rotatably connected to multiple sets of rollers, and the axis of the rollers is perpendicular to the axis of the movable tube.

[0019] In summary, the beneficial effects of this invention are:

[0020] 1. During the unwinding process, the stress released by the twist torque of the yarn drives the movable tube to rotate at a certain angle. The tension roller is controlled by a motor to swing within a specified angle range. During the swing of the tension roller, the relative displacement between the connecting roller and the tension roller causes the pressure inside the buffer chamber to change periodically. When the swing reaches near the maximum angle, the force between the tension roller and the yarn is small. During the tension roller reset process, the extension of the movable block increases the force with the yarn. When the tension roller resets, it drives the yarn to rotate and untwist. Different degrees of untwisting operations are performed according to the twist of the yarn, thereby avoiding problems such as yarn kinking and arching. This significantly improves the straightness and stability of the yarn in subsequent processing, as well as the uniformity of subsequent impregnation or lamination processes. At the same time, it reduces tension fluctuations, enhances the bonding strength between the yarn and the base material, and ultimately greatly improves the consistency and mechanical properties of the product.

[0021] 2. During the wire feeding process, the tension roller automatically adjusts and maintains the force on the wire body through the elastic force of spring one, thereby ensuring the continuous and stable operation of subsequent processing. At the same time, during the wire feeding process, the wire body can be pre-stretched through the differential rotation of the front guide roller and the rear guide roller, reducing and eliminating internal stress in advance, making the product dimension more stable in the later stage, thereby improving the stability and processing quality of the product in subsequent processing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall body provided in the embodiment of the present invention.

[0024] Figure 2This is a schematic diagram of the overall lead block provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the interior of the movable frame provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the inside of the lead block provided in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the overall driving component provided in an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the connecting rollers provided in an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the inside of the tension roller provided in an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the valve block provided in an embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the internal structure of the support frame provided in an embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the inside of the limiting tube provided in an embodiment of the present invention.

[0033] Legend:

[0034] 100. Machine body; 101. I-beam reel; 102. Production line; 103. Support frame; 200. Lead wire block; 201. Front fixed frame; 202. Rear fixed frame; 203. Front guide roller; 204. Rear guide roller; 205. Front drive wheel; 206. Rear drive wheel; 207. Movable frame; 208. Motor 1; 209. Support frame; 300. Spring 1; 301. Drive roller 1; 302. Drive roller 2; 303. Turntable; 304. Connecting rod; 305. Slider; 400. Tension roller; 401. Connecting roller; 402. Tooth; 403. Sealing block; 404. Sealing cavity; 405. Transmission gear; 406. Buffer cavity; 407. Piston block; 408. Valve block; 409. Connecting pipe; 410. Movable block; 411. Connecting groove; 412. Limiting protrusion; 500. Limiting tube; 501. Sleeve; 502. Movable tube; 503. Guide plate one; 504. Guide plate two; 505. Roller. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reference Figure 1-10This invention provides a constant tension unwinding device for polyester cord, comprising a body 100, and further comprising: an unwinding mechanism, including a reel 101 disposed inside the body 100, with cord 102 wound around the outer wall of the reel 101; a bracket 103 disposed on the top of the body 100, with a lead block 200 disposed on the top of the bracket 103; a front fixing frame 201 and a rear fixing frame 202 fixedly mounted on the top of the lead block 200; both the front fixing frame 201 and the rear fixing frame 202 are composed of two sets of symmetrically designed rods, and the front fixing frame 201 and the rear fixing frame 202 are rotatably connected to a front guide roller 203 and a rear guide roller 204, respectively; and a tension mechanism, including a tension mechanism sleeved on the lead block 200. The top movable frame 207 has a spring 300 between it and the lead wire block 200. A tension roller 400 is installed inside the movable frame 207. The wire 102 extends from the side wall of the I-beam reel 101 and passes sequentially through the side walls of the front guide roller 203, tension roller 400, and rear guide roller 204. The untwisting mechanism includes a drive roller 301 and a drive roller 302 installed inside the movable frame 207. A motor 208 connected to the drive roller 301 is installed on the side wall of the movable frame 207. The drive roller 301 and drive roller 302 are connected via gear transmission. Connecting rollers 401 are sleeved at both ends of the tension roller 400, with the connecting rollers 401 located away from the tension roller 404. One end of the tension roller 400 is connected to a slider 305 via a set of rotating shafts and spherical hinges. The slider 305 is vertically limited and movablely sleeved with the movable frame 207. Both ends of the transmission roller 202 are connected to turntables 303. The tops of both sliders 305 are connected to connecting rods 304 via spherical hinges. The end of the connecting rod 304 away from the slider 305 is rotatably connected to the side wall of the turntable 303 via a rotating shaft. The tension roller 400 is equipped with a drive assembly for driving the tension roller 400 to swing. The tension roller 400 is also equipped with a hydraulic assembly for changing the transmission resistance between the tension roller 400 and the wire body 102. The detection mechanism includes a support frame 209 set on the top of the lead block 200. The top of the 9 is movably sleeved with a sleeve 501. The top of the sleeve 501 is provided with a limit tube 500. A spring is provided between the limit tube 500 and the support frame 209. The inside of the limit tube 500 is rotatably connected to a movable tube 502. The thread 102 passes through the movable tube 502. The twist of the thread 102 before passing the front fixed frame 201 is detected by the transmission between the thread 102 and the movable tube 502. The stretching mechanism includes a front drive wheel 205 rotatably connected to the side wall of the front fixed frame 201 and a rear drive wheel 206 rotatably connected to the side wall of the rear fixed frame 202. The front drive wheel 205 is coaxially driven to the front guide roller 203, and the rear drive wheel 206 is coaxially driven to the rear fixed frame 202.

[0037] Furthermore, the diameter of the front drive wheel 205 is larger than the diameter of the rear drive wheel 206. The front drive wheel 205 and the rear drive wheel 206 are connected by a drive belt. It should be noted that the drive connection between the front drive wheel 205 and the rear drive wheel 206 drives the rear drive wheel 206 and the rear guide roller 204 to rotate faster. The speed of the rear guide roller 204 is greater than that of the front guide roller 203, thereby creating a stretching effect between the front guide roller 203 and the rear guide roller 204, achieving a pre-stretching effect on the line 102.

[0038] Reference Figure 2 - Figure 5 The drive assembly includes a transmission gear 405 located at the center of the tension roller 400, and a tooth 402 that meshes with the transmission gear 405 is provided at one end of the connecting roller 401 extending into the tension roller 400.

[0039] Reference Figure 3 - Figure 8 The hydraulic assembly includes a sealed cavity 404 and a buffer cavity 406 that are connected to each other inside the tension roller 400. A hydraulic transmission medium is provided between the sealed cavity 404 and the buffer cavity 406. A sealing block 403 that cooperates with the sealed cavity 404 is provided on the side wall of the connecting roller 401. A piston block 407 is sleeved inside the buffer cavity 406. A spring is provided between the piston block 407 and the buffer cavity 406. A connecting pipe 409 is provided inside the tension roller 400. A valve block 408 that controls the connection between the buffer cavity 406 and the connecting pipe 409 is sleeved inside the buffer cavity 406. A groove that cooperates with the line body 102 is provided on the outer wall of the sealed cavity 404 and the tension roller 400 for guiding and positioning the line body 102. Multiple sets of arc-shaped movable blocks 410 are sleeved on the inner side of the groove. One end of the tension roller 400 can extend out from the groove of the tension roller 400, and the other end of the tension roller 400 is connected to the connecting pipe 409.

[0040] Furthermore, the valve block 408 has two sets of limiting protrusions 412 on the side close to the piston block 407, which cooperate with the piston block 407. The valve block 408 has a connecting groove 411 that cooperates with the connecting pipe 409. It should be noted that when the sealing block 403 moves towards the buffer chamber 406, it pushes the hydraulic transmission medium inside the sealing chamber 404 into the interior of the buffer chamber 406. During the process of pushing the piston block 407 to move, the piston block 407 contacts the limiting protrusions 412, pushing the valve block 408 away from the sealing chamber 404 until the valve block 408 disengages from the connecting pipe 409, so that the connecting groove 411 connects with the connecting pipe 409. This causes the hydraulic medium to push the movable block 410 out through the connecting pipe 409, increasing the force between the tension roller 400 and the yarn body 102, causing the yarn body 102 to rotate and untwist. When the sealing block 403 resets, the pressure inside the sealing cavity 404 decreases, drawing the hydraulic medium back. After the hydraulic medium between the movable block 410 and the connecting pipe 409 is drawn into the sealing cavity 404, the piston block 407 also resets. During the reset process, the piston block 407 pushes the limiting protrusion 412 to move towards the sealing cavity 404 to reset. At the same time, the connecting groove 411 also moves and is misaligned with the connecting pipe 409, so that the valve block 408 restores the blockage of the connecting pipe 409.

[0041] It should be noted that the connecting rods 304 connected to the two sliders 305 have different lengths. When the tension roller 400 is in the initial horizontal state, the top of one connecting rod 304 is connected to the turntable 303 at the lowest position, so that it will only rise during subsequent movement. The top of the other connecting rod 304 is connected to the turntable 303 on the corresponding side at the highest position, so that it will only fall during subsequent movement. When the transmission roller 302 drives the two turntables 303 to rotate simultaneously, the two sliders 305 reciprocate in the vertical direction at the same time. One slider 305 rises to the highest position and then falls back to the starting position, while the other slider 305 falls to the lowest position and then rises back to the starting position. This limits the angle of the reciprocating swing motion of the tension roller 400 around the center point. The swing of one side of the tension roller 400 will not fall below the horizontal line, and the swing of the other side will not exceed the horizontal line.

[0042] Furthermore, a set of guide plates 503 is provided on the outer wall of the movable tube 502, and a ring of guide plates 504 distributed in a circular pattern is provided on the inner wall of the limiting tube 500. The guide plates 503 and 504 cooperate with each other. It should be noted that the cooperation between the guide plates 503 and 504 is based on a set of 555 timers installed inside the limiting tube 500. The 555 timer is existing technology. A monostable trigger circuit is constructed using the 555 timer chip to convert the contact between the guide plates 503 and 504 into an electronic signal, triggering the motor 208 to rotate a fixed number of revolutions, thereby driving the tension roller. The circuit completely ignores the continuous low-level state of the input terminal during and after the output pulse, even if the first guide plate 503 and the second guide plate 504 continue to contact after the rotation stops. Therefore, a second signal will never be generated, ensuring that each effective contact corresponds to only one clean and jitter-free output pulse. This achieves the goal that the greater the twist of the yarn 102, the more rotations the movable tube 502 will make. This ensures the number of contact signals triggered by the first guide plate 503 and the second guide plate 504, thereby controlling the number of rotations of the motor 208 to correspond to the twist of the yarn 102. The greater the twist, the more untwisting rotation cycles there are.

[0043] Furthermore, the inner wall of the movable tube 502 is rotatably connected to multiple sets of rollers 505, the axis of the rollers 505 being perpendicular to the axis of the movable tube 502. Specifically, the axis of the rollers 505 is perpendicular to the projection of the axis of the movable tube 502 in the horizontal direction.

[0044] The working process of this constant tension pay-off device for polyester cord is as follows:

[0045] During the wire feeding process, the wire 102 on the side wall of the machine body 100 is released by the rotation of the I-beam wheel 101. After passing through the movable tube 502, the wire 102 contacts the outer wall of the front guide roller 203, then turns downward to contact the outer wall of the tension roller 400, and then turns upward to contact the rear guide roller 204. Finally, the output wire feeding is adjusted by the rear guide roller 204 to continuously feed the wire towards the subsequent processing flow. During this process, the movable frame 207 exerts a set of downward force on the wire 102 under the elastic force of the spring 300. The pressure ensures that the wire 102 passing between the front guide roller 203 and the rear guide roller 204 maintains a certain tension. Moreover, in the later stage of the wire feeding process of the I-beam 101, as the total diameter of the wire 102 wound on the side wall of the I-beam 101 decreases, the movable frame 207 will automatically adjust the height of the tension roller 400 according to the reset of the spring 300. This ensures that the wire 102 released by the front guide roller 203 and the rear guide roller 204 maintains a constant tension, thus ensuring the continuous and stable operation of the subsequent processing flow.

[0046] During the passage of the yarn 102 through the movable tube 502, under the elastic force between the limiting tube 500 and the support frame 209, the yarn 102 continuously contacts the movable tube 502 and its internal rollers 505. As the yarn 102 moves along the internal axis of the movable tube 502, the rollers 505 can convert the sliding friction between the yarn 102 and the movable tube 502 into rolling friction, reducing wear. When there is twist in the yarn 102 between the I-beam roller 101 and the front guide roller 203, the yarn 102 releases the torque stored in the twist as stress as it passes through the movable tube 502. Since the rollers 505 cannot convert the circumferential motion of the movable tube 502 into rotational friction, the stress released by the twist generates a rotational force on the movable tube 502. The rotational force drives the movable tube 502 to rotate. During rotation, the guide plate 503 on the outer wall of the movable tube 502 contacts and triggers the guide plate 504, controlling the motor 208 to rotate a certain number of revolutions. The rotation of the motor 208 drives the transmission rollers 301 and 302 to rotate, further driving the two turntables 303 to rotate simultaneously. When the two turntables 303 drive the two sliders 305 to reciprocate in the vertical direction through connecting rods 304 of different lengths, one slider 305 cycles up and down, and the other slider 305 cycles down and up, thus causing the tension roller 400 to oscillate around the center point. During the process of the tension roller 400 oscillating to the maximum tilt angle, the distance between the two sliders 305 and the tension roller 400 increases, causing the two connecting rods 304 to oscillate around the center point. Roller 401 simultaneously slides relative to tension roller 400. However, under the meshing transmission of transmission gear 405 and teeth 402 on both sides, the relative movement distance between connecting rollers 401 and tension roller 400 is consistent. This causes tension roller 400 to rotate along the axis of transmission gear 405 during its swing, resulting in the swinging of both ends of tension roller 400. The middle section of tension roller 400, including the central part of the arc-shaped groove area that contacts and engages with line 102, will not experience vertical displacement, ensuring that the tension of line 102 is not affected. During the swing reset process of tension roller 400, connecting roller 401 first moves towards buffer chamber 406, pushing the hydraulic medium inside sealing chamber 404 into the interior of buffer chamber 406, pushing piston block 407 to move and compress the piston block 407. Furthermore, when the tension roller 400 swings close to its maximum angle, the piston block 407 moves to the limiting protrusion 412 on the side away from the sealing cavity 404 and pushes the valve block 408, causing the valve block 408 to disengage from the blockage of the connecting pipe 409. The connecting pipe 409 is connected to the buffer cavity 406 through the connecting groove 411. The hydraulic medium inside the buffer cavity 406 pushes the movable block 410 out through the connecting pipe 409, increasing the stress contact with the yarn 102. During the reset process of the tension roller 400, the movable block 410 can drive the yarn 102 to rotate, realizing the rotation and release of the twist of the yarn 102. At the same time, the sealing block 403 moves away from the buffer cavity 406 during the reset process, the pressure inside the sealing cavity 404 decreases, and the hydraulic medium is drawn back.When the hydraulic medium between the movable block 410 and the connecting pipe 409 is drawn into the sealing cavity 404, the piston block 407 also resets. During the reset process, the piston block 407 pushes the limiting protrusion 412 to move towards the sealing cavity 404, and at the same time, the connecting groove 411 also moves and misaligns with the connecting pipe 409, so that the valve block 408 resumes its blockage of the connecting pipe 409. This ensures that during the swing of the tension roller 400, the movable block 410 does not extend before swinging to its maximum angle, and the stress between the tension roller 400 and the line body 102 is reduced. In the resetting process, the movable block 410 extends to increase the force, causing the yarn 102 to rotate unidirectionally, achieving an anti-twisting effect. By eliminating the internal stress and rotational tendency of the yarn 102 caused by its inherent twist during the unwinding process, problems such as kinking and arching of the yarn 102 are fundamentally avoided. This significantly improves the straightness and stability of the yarn 102 laying, ensuring the uniformity of subsequent impregnation or lamination processes. Simultaneously, it reduces tension fluctuations, enhances the bonding strength between the yarn 102 and the matrix material, and ultimately greatly improves the consistency and mechanical properties of the product.

[0047] It should be noted that the greater the twist of the yarn 102, the greater the angle at which the movable tube 502 rotates, the more times the guide plate 1 503 and guide plate 2 504 are triggered, thus controlling the motor 1 208 to rotate more times, and thus controlling the tension roller 400 to swing more times, resulting in a greater degree of untwisting.

[0048] It should be noted that during the processing of yarn 102, its twist direction remains highly consistent. This is ensured by modern and standardized production processes. The twist direction and twist of yarn 102 are determined in the specialized twisting or plying process. Subsequent winding processes only physically collect the yarn and do not change its inherent characteristics. This consistency is a fundamental requirement for product quality control, ensuring that the mechanical properties of yarn in the same roll or even the same batch are uniform. This provides a stable processing foundation for subsequent weaving, impregnation, and forming processes, and also simplifies the design of the unwinding and untwisting equipment. Therefore, during the oscillation of tension roller 400, it will only rotate unidirectionally to untwise according to the twist direction of yarn 102, avoiding the side effects of multidirectional rotation on the untwisting work.

[0049] Simultaneously, when the yarn 102 first passes through the front guide roller 203, which drives the front guide roller 203 and the front drive wheel 205 to rotate, the front drive wheel 205 is connected to the rear drive wheel 206, which drives the rear drive wheel 206 and the rear guide roller 204 to rotate faster. This makes the speed of the rear guide roller 204 greater than that of the front guide roller 203, thereby creating a stretching effect between the front guide roller 203 and the rear guide roller 204, achieving a pre-stretching effect on the yarn 102. It should be noted that polyester yarn has a certain degree of creep. The root cause of its creep lies in the polymer chain structure of polyester. During subsequent continuous stretching, these molecular chains will slowly slide, straighten, and rearrange. This process is macroscopically manifested as creep. Performing a small and controllable pre-stretching during the constant tension unwinding stage can eliminate its internal stress in advance, making the product more dimensionally stable in the later stages, thereby improving the stability and processing quality of the product in subsequent processing.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A constant tension pay-off device for polyester strands, comprising a machine body (100), characterized in that, Also include: wire mechanism, including the setting in the machine body (100) inside the spool (101), the outer wall of the spool (101) winding wire body (102), the top of the machine body (100) is provided with a support (103), the top of the support (103) is provided with a lead block (200); tension mechanism, including the sleeve of the lead block (200) top of the movable frame (207), the movable frame (207) and lead block (200) between the spring (300) is provided, the movable frame (207) is provided with a tension roller (400) inside; untwisting mechanism, including the transmission roller one (301) and transmission roller two (302) arranged in the movable frame (207), the sidewall of the movable frame (207) is provided with motor one (208) which is in transmission connection with the transmission roller one (301), the transmission roller one (301) and the transmission roller two (302) are in gear transmission connection, both ends of the tension roller (400) are sleeved with a connecting roller (401), one end of the connecting roller (401) away from the tension roller (400) is connected with a sliding block (305) through a group of rotating shafts and spherical hinge shafts, the sliding block (305) is movably sleeved with the movable frame (207) in the vertical direction, both ends of the transmission roller two (302) are connected with a rotating disc (303), the top of both sides of the sliding block (305) is connected with a connecting rod (304) through spherical hinge shafts, one end of the connecting rod (304) away from the sliding block (305) is rotatably connected with the sidewall of the rotating disc (303) through a rotating shaft, the inside of the tension roller (400) is provided with a driving assembly for driving the tension roller (400) to swing, the inside of the tension roller (400) is provided with a hydraulic assembly for changing the transmission resistance between the tension roller (400) and the wire body (102); the top of the lead block (200) is fixedly installed with a front fixed frame (201) and a rear fixed frame (202), the front fixed frame (201) and the rear fixed frame (202) are rotatably connected with a front wire roller (203) and a rear wire roller (204) respectively, the sidewall of the front fixed frame (201) is rotatably connected with a front transmission wheel (205), the sidewall of the rear fixed frame (202) is rotatably connected with a rear transmission wheel (206), the front transmission wheel (205) is coaxially transmission connected with the front wire roller (203), the rear transmission wheel (206) is coaxially transmission connected with the rear fixed frame (202), the diameter of the front transmission wheel (205) is greater than the diameter of the rear transmission wheel (206), the front transmission wheel (205) and the rear transmission wheel (206) are transmission connected through a transmission belt; The liquid driving assembly comprises a sealed cavity (404) and a buffer cavity (406) which are opened in the inside of the tension roller (400) and are communicated with each other, a hydraulic transmission medium is arranged between the sealed cavity (404) and the buffer cavity (406), the side wall of the connecting roller (401) is provided with a sealing block (403) matched with the sealed cavity (404), the inside of the buffer cavity (406) is sleeved with a piston block (407), a spring is arranged between the piston block (407) and the buffer cavity (406), the inside of the tension roller (400) is opened with a communicating pipe (409), the inside of the buffer cavity (406) is sleeved with a valve block (408) for controlling the communication between the buffer cavity (406) and the communicating pipe (409), the outside wall of the tension roller (400) is provided with a groove matched with the wire body (102) for guiding and positioning the wire body (102), the inside of the groove is sleeved with a plurality of groups of arc-shaped movable blocks (410), one end of the tension roller (400) can be extended from the inside of the groove of the tension roller (400), and the other end of the tension roller (400) is communicated with the communicating pipe (409).

2. A constant tension yarn feed device for polyester cords as claimed in claim 1, characterized in that The driving assembly comprises a transmission gear (405) arranged at the center of the tension roller (400), and the end of the connecting roller (401) extending into the inside of the tension roller (400) is provided with a tooth (402) engaged with the transmission gear (405).

3. A constant tension yarn feed device for polyester cords as claimed in claim 1, wherein, The valve block (408) is provided with two groups of limiting protrusions (412) matched with the piston block (407) on the side close to the piston block (407), and the valve block (408) is opened with a communicating groove (411) matched with the communicating pipe (409).

4. A constant tension yarn feed device for polyester cords as claimed in claim 1, wherein, The connecting rods (304) connected with the sliding blocks (305) on two sides are different in length, and when the tension roller (400) is in the initial horizontal state, the top of one side of the connecting rod (304) is in the lowest position, and the top of the other side of the connecting rod (304) is in the highest position.

5. A constant tension yarn feed device for polyester cords as claimed in claim 1, wherein, The lead block (200) is provided with a supporting frame (209) at the top, the supporting frame (209) is movably sleeved with a sleeve pipe (501) at the top, the sleeve pipe (501) is provided with a limiting pipe (500) at the top, a spring is arranged between the limiting pipe (500) and the supporting frame (209), a movable pipe (502) is rotatably connected in the inside of the limiting pipe (500), the wire body (102) passes through the movable pipe (502), the twist of the wire body (102) before the front fixed frame (201) is detected through the transmission between the wire body (102) and the movable pipe (502), a group of guide plates one (503) are arranged on the outside wall of the movable pipe (502), a ring of guide plates two (504) are arranged on the inside wall of the limiting pipe (500), and the guide plates one (503) and the guide plates two (504) are matched.

6. A constant tension yarn feed device for polyester cords as claimed in claim 5, characterized in that The inner side wall of the movable tube (502) is rotationally connected with a plurality of groups of rollers (505), and the axis of the rollers (505) is perpendicular to the axis of the movable tube (502).

Images