Crank eccentricity adjustable and secondary weft pulling and inserting device driven by servo motor

Abstract

The invention discloses a crank eccentricity adjustable and secondary weft pulling and inserting device driven by a servo motor, and belongs to the technical field of textile machinery. In order to solve the problems that an existing weft insertion mechanism is fixed in weft insertion stroke and lacks secondary weft pulling correction capacity, the weft insertion mechanism comprises a fixing support (1), a servo motor (5), a crank body (6), a connecting rod (sector gear) (4), a reduction gear set (3) and a rapier driving shaft (2). And the crank main body (6) realizes stepless adjustment of crank eccentricity through an eccentric adjusting mechanism formed by an adjusting block (7), a locking nut (8) and an adjusting bolt (9), so that the main wefting insertion stroke of the rapier is adjusted. And the servo motor (5) drives the crank main body (6) and performs secondary micro-motion after the main weft insertion action is finished through programming control, so that secondary weft pulling correction of weft yarns is realized. The weft insertion stroke is flexibly and steplessly adjustable, meanwhile, the precise secondary weft pulling action is achieved through the servo control capacity, weft looseness is effectively eliminated, the straightness of weft at a cloth fell is improved, and the fabric quality and the high-speed stability of a weaving machine are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of textile machinery technology, and particularly relates to a weft insertion device for rapier looms. Background Technology

[0002] Weft insertion is one of the five major movements of a loom. Weft insertion efficiency is directly related to the production efficiency of the loom, especially in the field of metal weaving, where the weft insertion efficiency is low and cannot meet the development of high speed and wide width.

[0003] Traditional rapier looms typically employ fixed cam or crank-connecting rod mechanisms for mechanical drive in their weft insertion mechanisms. This type of drive method has the following drawbacks.

[0004] Fixed weft insertion trajectory and timing: Once the crank eccentricity of the mechanism is set, it cannot be changed during operation, resulting in a fixed stroke and motion curve of the weft insertion rapier. This lacks the flexibility to adapt to different widths, different weft yarn types, or increased machine speeds.

[0005] Complex adjustment: Changing the weft insertion trajectory usually requires replacing mechanical parts (such as cams or eccentric discs), which is time-consuming and labor-intensive, affecting production efficiency.

[0006] High-speed performance limitations: When pursuing high-speed weft insertion, the impact and vibration generated by the fixed mechanical mechanism are relatively large, which limits the further increase of the loom speed.

[0007] Lack of secondary action capability: Traditional fixed mechanisms have difficulty accurately realizing the secondary weft pulling or precise positioning action after the main weft insertion action in one cycle, which affects the weaving of high-density, high-quality fabrics.

[0008] High energy consumption: Mechanical drives are relatively inefficient in utilizing energy.

[0009] The purpose of this invention is to provide a novel weft insertion device that overcomes the problems of inflexible weft insertion stroke and trajectory adjustment, limited high-speed performance, and inability to achieve flexible secondary weft pulling in the prior art, so as to achieve adjustable weft insertion stroke, controllable weft insertion curve, efficient secondary weft pulling, and high-speed, low-impact weft insertion process. Summary of the Invention

[0010] The present invention provides a crank eccentricity adjustable and secondary weft insertion device driven by a servo motor, characterized in that the device mainly includes: a servo motor, a crank connecting rod structure, an eccentricity adjustment mechanism, a sector gear and a reduction gear set.

[0011] This invention provides a crank eccentricity adjustable and secondary weft insertion device driven by a servo motor, characterized in that the device is mainly installed on a fixed bracket (1) and includes: a servo motor (5): serving as a power input source, providing programmable, high-precision, and high-dynamic-response speed and torque control; an adjustable eccentric crank (6): driven by the servo motor (5), whose eccentricity can be steplessly adjusted by an eccentricity adjustment mechanism (C); a connecting rod (sector gear) (4): one end is hinged to the adjustable eccentric crank (6), and the other end is designed as a sector gear; a reduction gear set (3): the sector gear (4) meshes with the input end of the reduction gear set (3); and a rapier drive shaft (2): the output end of the reduction gear set (3) is connected to the rapier drive shaft (2), which is used to drive the rapier (not shown) to reciprocate in the shed.

[0012] Compared with the prior art, the present invention has the following significant advantages: Flexible and adjustable weft insertion stroke: By adjusting the eccentricity of the adjustable eccentric crank (6), the main stroke of the rapier can be adjusted steplessly, quickly adapting to different weaving widths, improving the equipment's versatility and variety change efficiency.

[0013] Achieving Precise Secondary Weft Pulling: Utilizing the high-precision control capabilities of servo motors, a secondary weft pulling action that is difficult to achieve with traditional mechanisms is realized. This function significantly improves the positioning accuracy and tension stability of the weft yarn, which is key to enhancing the quality of high-density, high-quality fabrics.

[0014] Optimized and controllable weft insertion curve: The servo motor (5) allows for programmable control of the entire motion curve of the rapier, including the main weft insertion and secondary weft pulling actions, which can achieve flexible acceleration and deceleration, effectively reduce mechanical impact and vibration, and improve the high-speed stability and component life of the loom.

[0015] Compact structure and high transmission efficiency: The design of sector gear (4) and reduction gear set (3) makes the mechanism transmission chain compact, with high transmission efficiency, and easy to integrate and maintain. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a crank eccentricity adjustable and secondary weft pulling device driven by a servo motor according to the present invention.

[0017] Figure 2 This is a partially enlarged schematic diagram of the adjustable eccentric crank (6). The reference numerals shown in the figure include: 1 Fixed bracket; 2 Rapier drive shaft; 3 Reduction gear set; 4 Connecting rod (sector gear); 5 Servo motor; 6 Adjustable eccentric crank.

[0018] The components of the eccentric adjustment mechanism include: 7 adjusting block; 8 locking nut; 9 adjusting bolt. Specific implementation methods

[0019] This invention provides a crank eccentricity adjustable and secondary weft insertion device driven by a servo motor.

[0020] like Figure 1 As shown, all components of this device are mounted on a fixed bracket (1). The servo motor (5) serves as the power input and is connected to the input shaft of the adjustable eccentric crank (6) via a coupling or synchronous belt.

[0021] The eccentricity of the crank bearing housing of the adjustable eccentric crank (6) can be adjusted by its built-in eccentricity adjustment mechanism. Figure 2 The eccentricity can be adjusted manually or automatically. By adjusting the eccentricity, the swing amplitude of the connecting rod (sector gear) (4) connected to the crank can be precisely controlled, thereby steplessly adjusting the weft insertion stroke of the rapier (not shown).

[0022] One end of the connecting rod (sector gear) (4) is connected to the adjustable eccentric crank (6) by a hinge, and the other end forms a sector gear, which meshes with the input gear of the reduction gear set (3). The reduction gear set (3) converts the reciprocating oscillation (circular motion) of the connecting rod (4) into the reciprocating rotation of the rapier drive shaft (2), which ultimately drives the rapier (not shown) to complete the weft insertion process in the shed.

[0023] During the weft insertion process, the servo motor (5) receives instructions from the loom's main control system to control its speed and angle, thereby driving the weft insertion mechanism.

[0024] Weft insertion stroke adjustment: The operator changes the maximum weft insertion stroke of the rapier (B) by adjusting the eccentric adjustment mechanism (C) to adapt to different weft widths.

[0025] Weft insertion curve control: The motion curve of the servo motor (5) can be programmed according to factors such as weft yarn type and loom speed to achieve flexible control of acceleration, constant speed and deceleration during the weft insertion process.

[0026] Secondary weft tensioning is achieved by the servo motor (5) performing a short-duration, small-angle micro-motion in both forward and reverse directions (or only in one direction) according to a preset time node or stroke (e.g., 10ms or 50mm before the rapier reaches its position). This micro-motion is transmitted to the rapier drive shaft (2) through the crank connecting rod and gear set (3), so that the rapier (not shown) performs a precise secondary tensioning and positioning of the weft yarn (not shown), effectively eliminating weft yarn slack, ensuring its straightness and tension stability, and greatly improving the straightness of the weft yarn at the weave point and the final fabric quality.

[0027] This invention, by combining the adjustability of the mechanical structure with the flexibility of servo motor control, completely solves the rigidity limitation of the traditional weft insertion mechanism, representing a technological advancement in the weft insertion mechanism of rapier looms.

Claims

1. A crank eccentricity adjustable and secondary weft insertion device driven by a servo motor, characterized in that, It includes a fixed bracket (1), a rapier drive shaft (2), a reduction gear set (3), a connecting rod (sector gear) (4), a servo motor (5), and a crank body (6); the crank body (6) is driven by the servo motor (5) and is hinged to the connecting rod (sector gear) (4) through an adjusting block (7); the connecting rod (sector gear) (4) meshes with the input end of the reduction gear set (3), and the output end of the reduction gear set (3) is connected to the rapier drive shaft (2).

2. The weft insertion device according to claim 1, characterized in that, The eccentricity of the crank body (6) is adjusted by an eccentricity adjustment mechanism, which includes an adjustment block (7), a locking nut (8), and an adjustment bolt (9) on the crank body (6). The adjustment block (7) is used to connect with the connecting rod (sector gear) (4). The adjustment block (7) is driven to move by the adjustment bolt (9) to change the crank eccentricity, and is locked by the locking nut (8).

3. The weft insertion device according to claim 1, characterized in that, The servo motor (5) can perform secondary micro-motion control on the crank body (6) in the weft insertion cycle according to the preset program, so as to realize the secondary weft pulling action of the weft yarn.

4. The weft insertion device according to claim 3, characterized in that, The secondary micro-motion control is performed at critical moments before and after the rapier completes the main weft insertion stroke, aiming to eliminate weft slack and improve the straightness of the weft at the weave point.

5. The weft insertion device according to claim 1, characterized in that, The sector teeth of the connecting rod (sector gear) (4) mesh with the input gear of the reduction gear set (3), converting the reciprocating swing of the connecting rod (4) into the reciprocating rotation of the rapier drive shaft (2).

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