Method and device for measuring dynamic stiffness of griffe support connecting system of heald griffe

Abstract

The invention discloses a device for measuring the dynamic stiffness of a griffe support connecting system of a heald griffe. The device comprises two griffe supports connected to the two ends of the heald griffe, the griffe supports are fastened to the heald griffe through two sets of bolts, the number of the bolts is six, one end of each pull rod is connected to the upper portion of the corresponding griffe support through a bolt and a nut, six testing shafts are connected to the side, with the six bolt holes of the griffe supports, of the heald griffe, the testing shafts are connected with sensors respectively, and the sensors are connected to a signal analyzer through a load amplifier and transmitters. The device further comprises a force hammer, a force sensor is installed on the force hammer, the signal analyzer is connected to the force hammer, the force sensor is connected to the signal analyzer through a charge amplifier, and the signal analyzer is connected with a display screen. A tilt angle sensor, a displacement sensor and an acceleration sensor are used for measuring the responses of the connecting parts of the heald griffe and the griffe supports, and thus the dynamic stiffness and the dynamic damp of the heald griffe connecting system can be obtained.

Description

technical field [0001] The invention relates to the field of jacquard looms, in particular to a method and device for measuring the dynamic stiffness of a connection system of a heald-lifting knife and a knife-lifting support. Background technique [0002] The shedding system of the heald raising knife is the part with the highest failure rate of the jacquard loom, and various dynamic performance problems occur in the system. The passage has changed; the second heald lifting knife rises to the top of the shed or falls to the bottom, and the heald lifting knife cannot stop, and oscillates back and forth at the top or bottom of the shed. The heald lifting knife oscillates not only in the direction of movement, but also in the direction of warp yarn movement, with an amplitude of more than 2 mm. Most of the warp yarn breakage occurs in the heald lifting area. [0003] Dynamic parameters such as dynamic stiffness are related to the operating frequency and system load. With the ...

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Problems solved by technology

[0003] Dynamic parameters such as dynamic stiffness are related to the operating frequency and system load. With the increase of the loom speed, the first few resonance frequencies of the shedding system of the heald lifting knife overlap with the operating frequency of the shedding system, especially in the resonance area, the heald lifting knife The dynamic damping of the shedding system becomes very small, resulting in reduced running quality of the shedding system, prolonged downtime due to warp yarn breakage, and decreased weaving efficiency

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