Rapier loom for manufacturing carbon fiber fabric and control method thereof

Abstract

This invention discloses a rapier loom for manufacturing carbon fiber fabric, comprising a frame, on which are mounted a take-up mechanism, a warp feed mechanism, a shedding mechanism, a weft insertion mechanism, and a beat-up mechanism. The warp feed mechanism includes an AC servo driver, on which a warp feed motor is mounted, and on which a variable speed motor is mounted, connected to a warp beam. The beat-up mechanism includes a main shaft, on which a reed is mounted. Drivers are mounted above and below the reed. Multiple four-bar linkages are hinged to the front end of the reed, with the drivers abutting against the upper and lower hinge points of the four-bar linkages. Warp threads pass through the four-bar linkages. Return springs are mounted between the upper and lower hinge points of the four-bar linkages. An arc-shaped strip is mounted on the front hinge point of the four-bar linkage, intermittently abutting against the weft threads. This invention has the following advantages and effects: By changing the working principle of the reed, the original oscillating weft insertion is changed to a linear weft insertion, which makes the weft yarn more stable in a horizontal position during weft insertion. Furthermore, when the curved strip strikes the weft yarn, the area acting on the outer wall of the weft yarn is larger, reducing the pressure of the reed striking the weft yarn and improving the weft insertion quality. This invention also discloses an adapted warp tension control method to help avoid problems such as breakage of carbon fiber warp yarns.

Description

Technical Field

[0001] This invention relates to the field of rapier loom technology, and particularly to a rapier loom for manufacturing carbon fiber fabrics and its control method. Background Technology

[0002] The weaving process of carbon fiber fabrics is quite difficult because carbon fiber yarns have extremely strong tensile strength in the longitudinal direction but extremely weak shear strength in the transverse direction. They are prone to fuzzing due to friction. Compared with other traditional loom materials, carbon fiber yarns are brittle and lack flexibility, which places extremely high demands on the working conditions of the loom.

[0003] In existing technologies, for example, a domestic company upgraded and improved the domestic GA747-II rapier loom, creatively proposing a simulated warping method to weave carbon fiber cloth. It focused on optimizing the yarn tension control system, heald angle distribution, heald frame opening amount, weft insertion time, and other aspects of the carbon fiber cloth weaving process. It has shown significant effectiveness in addressing issues such as the high brittleness and excessive fuzzing of carbon fiber yarn. However, due to the slightly large vibration generated by the weft insertion mechanism, occasional defects are produced in the fabric.

[0004] Tianjin University of Technology has developed a carbon fiber multilayer corner loom with international advanced level. The equipment can weave carbon fiber multilayer fabrics with a width of up to 1200mm and 30 warp layers. However, when faced with thick carbon fiber multilayer fabrics, its weft-beating mechanism is slightly insufficient in weft-beating force.

[0005] Some domestic companies have designed special carbon fiber looms that are only used to weave certain specific carbon fiber fabrics, resulting in a slightly lower product coverage.

[0006] It can be said that my country still has a long way to go in the research of special looms for carbon fiber. Summary of the Invention

[0007] The purpose of this invention is to provide a rapier loom for manufacturing carbon fiber fabrics and a method for controlling it.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a rapier loom for manufacturing carbon fiber fabric, comprising a frame, on which are arranged a take-up mechanism, a warp feed mechanism, a shedding mechanism, a weft insertion mechanism, and a beat-up mechanism. The warp feed mechanism includes an AC servo driver, an AC servo starter with a warp feed motor, a variable speed motor with a speed-changing motor connected to the variable speed motor; the beat-up mechanism includes a main shaft, which is rotatably arranged, and a reed is arranged on the main shaft. Drivers are arranged above and below the reed. Multiple four-bar linkages are hinged at the front end of the reed, and the drivers abut against the upper and lower hinge points of the four-bar linkages. Warp threads pass through the four-bar linkages; a return spring is arranged between the upper and lower hinge points of the four-bar linkages; an arc-shaped strip is arranged at the front hinge point of the four-bar linkage, and the arc-shaped strip intermittently abuts against the weft threads.

[0009] A further configuration is provided: a synchronizing rod is provided at the upper and lower hinge points between adjacent four-bar linkages.

[0010] The setting is further configured such that at least two interlocking sleeves are provided outside the reset spring.

[0011] This invention also discloses a method for controlling warp tension on a rapier loom used for manufacturing carbon fiber fabrics. The method includes a tension strain gauge sensor, on which a signal conditioning circuit, an A / D converter, a sampling controller, and a calculation area are sequentially connected. The calculation area includes a setting function for tension values. The calculation area calculates the average deviation of the tension for one weft, which is then corrected and sent to a PID controller and a fuzzy controller. The PID controller and the fuzzy controller calculate the real-time warp feed speed based on the basic warp feed speed. The real-time warp feed speed is then sent to an AC servo driver to control the movement of the warp feed motor.

[0012] Further configuration includes: a main spindle encoder, wherein the sampling encoder also acquires and calculates the main spindle angle; the warp beam radius and winding speed are calculated based on the main spindle encoder, and the basic warp feed speed is calculated.

[0013] The tension correction result is further configured to be calculated from the tension deviation of a cycle group.

[0014] In summary, this invention has the following beneficial effects: By changing the working principle of the reed, the original oscillating weft insertion is changed to a linear weft insertion, which makes the weft yarn more stable in a horizontal position during weft insertion. Furthermore, when the curved strip strikes the weft yarn, the area acting on the outer wall of the weft yarn is larger, reducing the pressure of the reed striking the weft yarn and improving the weft insertion quality. This invention also discloses an adapted warp tension control method to help avoid problems such as breakage of carbon fiber warp yarns. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a rapier loom; Figure 2 This is a flowchart illustrating the method for controlling warp tension.

[0016] In the diagram: 1. Frame; 2. Reed; 3. Driver; 4. Four-bar linkage; 5. Return spring; 6. Arc-shaped bar; 7. Synchronizing rod; 8. Sleeve rod. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] A rapier loom for manufacturing carbon fiber fabric includes a frame 1, on which a take-up mechanism, a warp feed mechanism, a shedding mechanism, a weft insertion mechanism, and a beat-up mechanism are provided.

[0019] The warp feeding mechanism includes an AC servo driver 3, an AC servo starter equipped with a warp feeding motor, a variable speed motor on the warp feeding motor, and a weaving beam connected to the variable speed motor.

[0020] The warp tension control method of the rapier loom includes hardware, such as a tension strain gauge sensor. The tension strain gauge sensor is connected in sequence to a signal conditioning circuit, an A / D converter, a sampling controller, and a calculation area. The calculation area is also used to set the tension value.

[0021] The calculation area is used to calculate the average deviation of the tension in one weft direction. This average deviation is corrected and then sent to the PID controller and the fuzzy controller. The PID controller and the fuzzy controller calculate the real-time warp feed speed based on the basic warp feed speed. This real-time warp feed speed is then sent to the AC servo driver 3 to control the movement of the warp feed motor. The tension correction result mentioned above is calculated from the tension deviation of a single cycle group.

[0022] This warp tension control method also requires hardware: a main shaft encoder. After the main shaft encoder encodes the yarn, the sampling encoder also collects the main shaft angle and performs calculations. In addition, the basic warp feed speed is calculated based on the warp beam radius and winding speed set by the main spindle encoder.

[0023] The weft insertion mechanism includes a main shaft with a reed 2 mounted on it. The main shaft is rotatable and can be fixed after angle adjustment. Drivers 3 are located above and below the reed 2. Multiple four-bar linkages 4 are hinged to the front end of the reed 2. The drivers 3 abut against the upper and lower hinge points of the four-bar linkages 4, and the warp threads pass through the four-bar linkages 4. Return springs 5 ​​are installed between the upper and lower hinge points of the four-bar linkages 4. An arc-shaped strip 6 is installed at the front hinge point of the four-bar linkage 4, intermittently abutting against the weft thread. By changing the working principle of the reed 2, the original oscillating weft insertion is changed to a linear weft insertion, making the weft thread more stable in a horizontal position during insertion. Furthermore, when the arc-shaped strip 6 strikes the weft thread, the area acting on the outer wall of the weft thread is larger, reducing the pressure of the reed 2 striking the weft thread and improving the weft insertion quality.

[0024] Among them, a synchronizing rod 7 is set at the upper and lower hinge points between adjacent four-bar linkages. The synchronizing rod 7 can ensure the synchronization of the entire row of four-bar linkages and ensure the quality of weft insertion.

[0025] The return spring 5 is provided with at least two interlocking sleeves 8, which can prevent the warp threads from getting entangled with the return spring 5.

[0026] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A rapier loom for manufacturing carbon fiber fabric, comprising a frame, wherein a take-up mechanism, a warp feed mechanism, a shedding mechanism, a weft insertion mechanism, and a beat-up mechanism are arranged on the frame, characterized in that: The warp feeding mechanism includes an AC servo driver, an AC servo starter with a warp feeding motor, a variable speed motor with a speed motor connected to a warp beam; the weft beating mechanism includes a main shaft, which is rotatably mounted, and a reed is mounted on the main shaft. Drivers are mounted above and below the reed. Multiple four-bar linkages are hinged to the front end of the reed, with the drivers abutting against the upper and lower hinge points of the four-bar linkages. Warp threads pass through the four-bar linkages; a return spring is mounted between the upper and lower hinge points of the four-bar linkages; an arc-shaped strip is mounted on the front hinge point of the four-bar linkage, intermittently abutting against the weft threads; a synchronizing rod is mounted on the upper and lower hinge points of adjacent four-bar linkages; at least two interlocking sleeves are mounted outside the return spring.

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