A yarn tension device for a circular knitting machine

Abstract

The utility model relates to the related field of circular knitting machine, especially knitted cloth circular knitting machine's yarn tensioner, including support frame, telescopic cylinder, lifting frame, mount, movable frame, slot, connecting frame, tension pulley, V type groove, placing groove, sealing plate, guide wheel, transmission plate, spring and motor etc. The utility model discloses sets up multiple independent tension pulleys on the mount, and every tension pulley can be fine tuned through the motor to satisfy the tensioning degree need of different yarn, makes yarn tension more even, is favorable to improve the quality of knitted cloth, and every tension pulley is provided with independent spring, and spring effectively absorbs the dynamic tension fluctuation in high -speed operation, avoids the situation of broken yarn or slack, makes cloth surface loop structure more even, is favorable to improve the quality of knitted cloth.

Description

Technical Field

[0001] This utility model relates to the field of circular knitting machines, and in particular to a yarn tensioning device for a circular knitting machine for fabric knitting. Background Technology

[0002] A circular knitting machine is a type of knitting equipment used for mass production of knitted fabrics. It uses the rotation of the cylinder to drive the knitting needles to work with multiple yarns to achieve continuous knitting. The yarn tensioning device is an important auxiliary component in the circular knitting machine. It is usually installed in the yarn conveying path and is used to adjust the tension of the yarn entering the cylinder to ensure that the yarn tension is uniform and stable, and to avoid yarn breakage, loosening and tangling. This improves the quality of the knitted fabric and ensures continuous production.

[0003] Existing yarn tensioning devices for circular knitting machines mostly adopt a coarse adjustment method that simultaneously adjusts the tension of multiple yarns. For example, the yarn tensioning device for a circular knitting machine disclosed in publication number CN222574944U can simultaneously adjust the tension of multiple yarns. Although this method has a simple structure, it has the following problems: 1. The tension of all yarns is forcibly uniform, and it is impossible to adjust the state of individual yarns independently. This can easily lead to uneven tension between yarns, causing problems such as sparse or dense patterns on the fabric, yarn breakage, or edge curling, which in turn affects the quality of the knitted fabric; 2. It lacks a buffer and fine-tuning mechanism, making it difficult to adapt to dynamic tension fluctuations during high-speed operation. Tension fluctuations can easily lead to uneven loop structure in the fabric, which in turn affects the quality of the knitted fabric. Summary of the Invention

[0004] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a yarn tensioning device for a circular knitting machine to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a yarn tensioning device for a circular knitting machine, comprising a support frame, a telescopic cylinder, a lifting frame, a fixed frame, a movable frame, a slot, a connecting frame, a tensioning wheel, a placement groove, a transmission plate, a spring, and a motor; the telescopic cylinder is installed on the top of the support frame; the lifting frame is movably installed inside the support frame, and the lifting frame is connected to the telescopic piston rod of the telescopic cylinder; the fixed frame is installed inside the lifting frame; several movable frames are rotatably installed inside the fixed frame; the connecting frame is movably installed in a slot opened on the top of the movable frame, and a tensioning wheel is rotatably installed on the connecting frame, through which the yarn passes, and the yarn tension is adjusted by the swing of the tensioning wheel; The fixed frame is provided with a placement slot, and a motor is installed in the placement slot. The output shaft of the motor is connected to the movable frame. A transmission plate is installed at the bottom of the connecting frame, and the transmission plate is connected to the inner bottom of the slot via a spring.

[0006] Preferably, each end of the support frame is provided with a set of guide wheels, each set of guide wheels consists of several guide wheels, and the several guide wheels correspond one-to-one with several tensioning wheels.

[0007] Preferably, both the tensioning wheel and the guide wheel are provided with V-shaped grooves, which are formed along the circumferential side surfaces of the tensioning wheel and the guide wheel.

[0008] Preferably, a sealing plate is detachably installed on the inner front end of the placement groove.

[0009] Preferably, the sealing plate has heat dissipation holes.

[0010] Preferably, a pressure sensor is provided between the transmission plate and the connecting frame.

[0011] The beneficial effects of this utility model are: This invention features multiple independent tensioning rollers on a fixed frame. Each tensioning roller can be finely adjusted by a motor to meet the tension requirements of different yarns, resulting in more uniform tension between yarns and improving the quality of knitted fabrics. Furthermore, each tensioning roller is equipped with an independent spring, which effectively absorbs dynamic tension fluctuations during high-speed operation, preventing yarn breakage or slackness, and making the fabric loop structure more uniform, which further enhances the quality of knitted fabrics. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the tensioning device structure of this utility model; Figure 2 This is a top view schematic diagram of the tensioning wheel connection structure of this utility model; Figure 3 This is a front view structural diagram of the tensioning device of this utility model; Figure 4 This is a front view cross-sectional diagram of the connection structure of the movable frame of this utility model.

[0013] The components include: support frame-1, telescopic cylinder-2, lifting frame-3, fixed frame-4, movable frame-5, slot-6, connecting frame-7, tensioning wheel-8, V-groove-9, placement slot-10, sealing plate-11, guide wheel-12, heat dissipation hole-13, transmission plate-14, pressure sensor-15, spring-16, and motor-17. Detailed Implementation

[0014] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0015] like Figures 1 to 4As shown, this utility model provides a yarn tensioning device for a circular knitting machine, including a support frame 1, a telescopic cylinder 2, a lifting frame 3, a fixed frame 4, a movable frame 5, a slot 6, a connecting frame 7, a tensioning wheel 8, a placement groove 10, a transmission plate 14, a spring 16, and a motor 17; the telescopic cylinder 2 is locked and fixed in the middle of the top surface of the support frame 1, and the lifting frame 3, which is connected to the piston rod at the bottom of the telescopic cylinder 2, is slidably installed inside the support frame 1; Telescopic cylinder 2 is a telescopic cylinder; The fixed frame 4 is fixedly installed inside the lifting frame 3; five movable frames 5 are rotatably installed inside the fixed frame 4; the connecting frame 7 is in the shape of an inverted U, and the connecting frame 7 is slidably installed in the slot 6 opened at the top of the movable frame 5, and a tensioning wheel 8 is rotatably installed on the connecting frame 7. The yarn passes through the tensioning wheel 8, and the yarn tension is adjusted by the swing of the tensioning wheel 8. The front end face of the fixed frame 4 is provided with a placement groove 10, and a motor 17 is installed in the placement groove 10. The output shaft of the motor 17 is coaxially connected to the movable frame 5 through a coupling. A sealing plate 11 with heat dissipation holes 13 is locked and fixed to the front end of the inner side of the placement groove 10, which facilitates the removal of the sealing plate 11 for maintenance of the motor 17. At the same time, the heat dissipation holes 13 facilitate the heat dissipation of the motor 17. A transmission plate 14 is installed at the bottom of the connecting frame 7, and the transmission plate 14 is connected to the inner bottom of the slot 6 via a spring 16.

[0016] In this embodiment, a set of guide wheels 12 is provided at each of the front and rear ends of the support frame 1. Each set of guide wheels 12 consists of several guide wheels 12. Several guide wheels 12 correspond one-to-one with several tension wheels 8. V-grooves 9 are provided along the circumferential side surfaces of the tension wheels 8 and guide wheels 12. By setting the guide wheels 12, the yarn is stably transported into the circular knitting machine. The V-grooves 9 are provided to prevent the yarn from shifting or misaligning.

[0017] In this embodiment, a pressure sensor 15 is provided between the transmission plate 14 and the connecting frame 7. The pressure sensor 15 detects the pressure of the yarn on the tensioning wheel 8, which facilitates the adjustment of the position of the tensioning wheel 8 and thus the tension of the yarn.

[0018] In this embodiment, motor 17 is a servo motor.

[0019] Specifically, the motor 17 and pressure sensor 15 are connected to an external control device. After the yarn passes through the tension wheel 8 and the guide wheel 12, it is connected to the cylinder of the circular knitting machine. The telescopic cylinder 2 is controlled to drive the lifting frame 3, the fixed frame 4, the movable frame 5 and the tension wheel 8 to move vertically. The vertical movement of the tension wheel 8 adjusts the tension of the yarn. The spring 16 can effectively absorb the dynamic tension fluctuations during high-speed operation and improve the stability of the yarn. When it is necessary to fine-tune the tension of individual yarns, the motor 17 is started to drive the movable frame 5 to rotate. The movable frame 5 drives the connecting frame 7 and the tension wheel 8 to swing. The swing of the tension wheel 8 changes the contact angle between the yarn and the wheel body, thereby adjusting the tension of the yarn. The tension wheel 8 adjusts the tension of the yarn. The pressure sensor 15 detects the pressure of the yarn and transmits the information to the external controller. When the pressure of the yarn on the tension wheel 8 reaches the preset value, the controller controls the motor 17 to stop working. At this time, the position of the tension wheel 8 is fixed, and the tension of the yarn on the tension wheel 8 reaches the preset value, which facilitates stable yarn feeding.

[0020] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A yarn tensioning device for a circular knitting machine, characterized in that, include: Support frame; Telescopic cylinder, which is mounted on top of the support frame; The lifting frame is movably installed inside the support frame, and the lifting frame is connected to the telescopic piston rod of the telescopic cylinder; A fixed frame, which is installed inside the lifting frame; The movable frame has several units rotatably mounted within the fixed frame; The connecting frame is movably installed in a slot on the top of the movable frame, and a tensioning wheel is rotatably installed on the connecting frame. The yarn passes through the tensioning wheel, and the yarn tension is adjusted by the swing of the tensioning wheel. The fixed frame is provided with a placement slot, and a motor is installed in the placement slot. The output shaft of the motor is connected to the movable frame. A transmission plate is installed at the bottom of the connecting frame, and the transmission plate is connected to the inner bottom of the slot via a spring.

2. The yarn tensioning device for a circular knitting machine according to claim 1, characterized in that: The support frame is provided with a set of guide wheels at both the front and rear ends. Each set of guide wheels consists of several guide wheels, and the several guide wheels correspond one-to-one with the several tensioning wheels.

3. The yarn tensioning device for a circular knitting machine according to claim 2, characterized in that: Both the tensioning wheel and the guide wheel are provided with V-shaped grooves, which are formed along the circumferential side surfaces of the tensioning wheel and the guide wheel.

4. The yarn tensioning device for a circular knitting machine according to claim 1, characterized in that: A sealing plate is detachably installed on the inner front end of the placement slot.

5. The yarn tensioning device for a circular knitting machine according to claim 4, characterized in that: The sealing plate has heat dissipation holes.

6. The yarn tensioning device for a circular knitting machine according to claim 1, characterized in that: A pressure sensor is installed between the transmission plate and the connecting frame.

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