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CN-121992559-A - Crank eccentric amount adjustable and secondary weft pulling weft insertion device driven by servo motor

CN121992559ACN 121992559 ACN121992559 ACN 121992559ACN-121992559-A

Abstract

The invention discloses a crank eccentric amount 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 the weft insertion stroke of the existing weft insertion mechanism is fixed and the secondary weft pulling correction capability is lacked, the device comprises a fixed support (1), a servo motor (5), a crank main body (6), a connecting rod (sector gear) (4), a reduction gear set (3) and a rapier driving shaft (2). The crank main body (6) realizes stepless adjustment of the eccentric amount of the crank through an eccentric adjusting mechanism formed by an adjusting block (7), a locking nut (8) and an adjusting bolt (9), thereby adjusting the main weft insertion stroke of the rapier. The servo motor (5) drives the crank main body (6) and executes secondary micro-motion after the main weft insertion action is completed through programming control, so that secondary weft pulling correction of weft yarns is realized. The invention realizes the flexible stepless adjustment of weft insertion stroke, realizes accurate secondary weft pulling action through servo control capability, effectively eliminates weft yarn relaxation, improves the flatness of weft yarn at a weaving port, and remarkably improves the quality of fabrics and the high-speed stability of a loom.

Inventors

  • Request for anonymity

Assignees

  • 高晓虎

Dates

Publication Date
20260508
Application Date
20260111

Claims (5)

  1. 1. The crank eccentric amount adjustable and secondary weft pulling weft insertion device driven by a servo motor is characterized by comprising a fixed support (1), a rapier driving shaft (2), a reduction gear set (3), a connecting rod (sector gear) (4), a servo motor (5) and a crank main body (6), wherein the crank main body (6) is driven by the servo motor (5) and is hinged with the connecting rod (sector gear) (4) through an adjusting block (7), the connecting rod (sector gear) (4) is meshed with the input end of the reduction gear set (3), and the output end of the reduction gear set (3) is connected with the rapier driving shaft (2).
  2. 2. Weft insertion device according to claim 1, characterized in that the eccentric amount of the crank body (6) is adjusted by an eccentric adjustment mechanism comprising an adjustment block (7) arranged on the crank body (6), a lock nut (8) and an adjustment bolt (9), the adjustment block (7) being intended to be connected with the connecting rod (sector gear) (4), the adjustment block (7) being driven by the adjustment bolt (9) to move for changing the crank eccentric amount and being locked by the lock nut (8).
  3. 3. Weft insertion device according to claim 1, characterized in that the servo motor (5) is capable of performing a secondary inching control of the crank body (6) during the weft insertion cycle according to a preset program to achieve a secondary weft pulling action of the weft yarn.
  4. 4. A weft insertion device according to claim 3, characterized in that the secondary inching control is performed at a critical moment before and after the rapier completes the main weft insertion stroke, aiming at eliminating weft yarn slack and improving the flatness of the weft yarn at the fell.
  5. 5. 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 oscillation of the connecting rod (4) into a reciprocating rotation of the rapier driving shaft (2).

Description

Crank eccentric amount adjustable and secondary weft pulling weft insertion device driven by servo motor Technical Field The invention belongs to the technical field of textile machinery, and particularly relates to a weft insertion device for a rapier loom. Background Weft insertion is one of five movements of a loom, and weft insertion efficiency is directly related to production efficiency of the loom, and particularly in the field of metal weaving, weft insertion efficiency is low, and high-speed and wide development cannot be met. The weft insertion mechanism of the traditional rapier loom is mechanically driven by adopting a fixed cam or crank-link mechanism. Such driving means have the following drawbacks. The weft insertion track and time are fixed, and once the crank eccentric amount of the mechanism is set, the crank eccentric amount cannot be changed in operation, so that the stroke and the motion curve of the weft insertion rapier are fixed. When the loom needs to adapt to different widths, different weft yarn types or increase the speed of the vehicle, the flexible adjustment capability is lacking. The adjustment is complicated, mechanical components (such as a cam or an eccentric disc) are usually required to be replaced by changing the weft insertion movement track, so that the time and the labor are consumed, and the production efficiency is affected. The high-speed performance is limited, and when the high-speed weft insertion is pursued, the impact and vibration generated by the fixed mechanical mechanism are large, so that the further improvement of the speed of the loom is limited. The traditional fixing mechanism is difficult to accurately realize secondary weft pulling or accurate positioning action after the main weft insertion action in one cycle, and the weaving of high-density and high-quality fabrics is affected. The energy consumption is high, and the efficiency of mechanical driving on energy utilization is relatively low. The invention aims to provide a novel weft insertion device, which aims to solve the problems that the weft insertion stroke and track adjustment is inflexible, the high-speed performance is limited and the flexible secondary weft pulling action cannot be realized in the prior art, so as to realize the weft insertion process of adjustable weft insertion stroke, controllable weft insertion curve, high-efficiency secondary weft pulling and high-speed low-impact. Disclosure of Invention The invention provides a crank eccentric amount adjustable and secondary weft pulling weft insertion device driven by a servo motor, which is characterized by mainly comprising the following components: servo motor, crank connecting rod structure, eccentric adjustment mechanism, sector gear and reduction gear group. The invention provides a crank eccentric amount adjustable and secondary weft pulling weft insertion device driven by a servo motor, which is characterized in that the device is mainly arranged on a fixed bracket (1) and comprises a servo motor (5) which is used as a power input source to provide programmable, high-precision and high-dynamic response rotating speed and torque control. The adjustable eccentric crank (6) is driven by a servo motor (5), and the eccentric amount of the adjustable eccentric crank can be adjusted steplessly through an eccentric adjusting mechanism (C). One end of the connecting rod (sector gear) (4) is hinged with the adjustable eccentric crank (6), and the other end is designed as a sector gear. The sector gear (4) is meshed with the input end of the speed reducing gear set (3). The output end of the speed reducing gear set (3) is connected with the rapier driving shaft (2), and the rapier driving shaft (2) is used for driving a rapier (not shown) to reciprocate in the shed. Compared with the prior art, the invention has the following remarkable beneficial effects: The weft insertion stroke is flexible and adjustable, namely, the main stroke of the rapier can be steplessly adjusted by adjusting the eccentric amount of the adjustable eccentric crank (6), so that the rapier is rapidly adapted to different weaving widths, and the universality of the equipment and the variety changing efficiency are improved. The accurate secondary weft pulling is realized by utilizing the high-precision control capability of the servo motor, and the secondary weft pulling action which is difficult to realize by the traditional mechanism is realized. The function obviously improves the positioning precision and tension stability of the weft yarn, and is a key for improving the quality of high-density and high-quality fabrics. The weft insertion curve is optimized and controllable, the servo motor (5) allows programming control of the whole motion curve of the rapier, including main weft insertion and secondary weft pulling actions, flexible acceleration and deceleration can be realized, mechanical impact and vibration are effectively reduced, and high-speed sta