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CN-122008592-A - Pultrusion traction system and method for actively inhibiting stick-slip vibration

CN122008592ACN 122008592 ACN122008592 ACN 122008592ACN-122008592-A

Abstract

The invention relates to the field of pultrusion equipment, in particular to a pultrusion traction system and a method for actively inhibiting stick-slip vibration, wherein the pultrusion traction system comprises a chain tension acquisition module, an acoustic energy injection module and a control unit, wherein the chain tension acquisition module is arranged at a stress node of a traction chain of a caterpillar traction module, the acoustic energy injection module is embedded in a track plate assembly of the caterpillar traction module, and the control unit is in communication connection with the chain tension acquisition module and the acoustic energy injection module; the pulling and extruding traction method comprises the step of increasing the output power of the acoustic energy injection module when receiving a signal which is sent by the chain tension acquisition module and indicates that the tension gradient shows nonlinear sharp increase. The invention uses the clamped profile as a stress wave conduction medium to reversely conduct high-frequency mechanical wave energy to the interface between the profile and the pultrusion die, and induces an acoustic softening effect, thereby actively reducing the friction coefficient between the profile and the pultrusion die and effectively inhibiting the stick-slip vibration.

Inventors

  • HAN YANZHENG

Assignees

  • 苏州深蓝万维能源科技有限公司
  • 实瀚复合材料(上海)有限公司
  • 实瀚复合材料(海宁)有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. A pultrusion traction system that actively dampens stick-slip vibrations, comprising: a crawler module (3) comprising a track shoe assembly (4) which contacts the profile (1) and performs a clamping and pulling action; The chain tension acquisition module is arranged at a stress node of a traction chain (31) of the caterpillar traction module (3); An acoustic energy injection module embedded inside the track shoe assembly (4) and configured to generate high frequency mechanical waves and to conduct vibrational energy to the interface of the profile (1) and the pultrusion die (2) with the clamped profile (1) as a stress wave conducting medium; The control unit is in communication connection with the chain tension acquisition module and the acoustic energy injection module and is configured to increase the output power of the acoustic energy injection module when receiving a signal which is sent by the chain tension acquisition module and indicates that the tension gradient shows nonlinear sharp increase, so as to reduce the friction coefficient between the profile (1) and the pultrusion die (2) through an acoustic softening effect.
  2. 2. The pultrusion pulling system of claim 1, wherein, The acoustic energy injection module comprises a two-dimensional array resonant cavity and a plurality of piezoelectric ultrasonic transducers (5), wherein the two-dimensional array resonant cavity is processed on the metal framework inside the track shoe assembly (4), and the piezoelectric ultrasonic transducers are coaxially embedded in the resonant cavity.
  3. 3. The pultrusion pulling system of claim 2, wherein, The piezoelectric ultrasonic transducer (5) is a shear type piezoelectric transducer, and the output end face of the shear type piezoelectric transducer generates shear deformation parallel to the drawing direction of the section bar (1) so as to excite longitudinal waves with the propagation direction parallel to the drawing direction in the section bar (1), so that the energy is reversely fed back to the pultrusion die (2) by utilizing the solid medium characteristic of the section bar (1).
  4. 4. The pultrusion pulling system of claim 2, wherein, Still include power module, power module includes: The collecting ring or the wireless electric energy transmitting end is arranged on the frame of the caterpillar traction module (3) and along the movement track of the traction chain (31); and a slip ring brush (6) or a wireless power receiving end which is arranged on the track shoe assembly (4) and moves synchronously with the track shoe assembly (4).
  5. 5. The pultrusion pulling system of claim 4, wherein, Track shoe assembly (4) contain track inner panel (41) and track planking (42), track inner panel (41) are fixed in on traction chain (31), track planking (42) with track inner panel (41) can dismantle and be connected, piezoelectric ultrasonic transducer (5) with track planking (42) integrated into one piece.
  6. 6. The pultrusion pulling system of claim 5, wherein, The crawler outer plate (42) is slidably connected with the crawler inner plate (41) through a dovetail groove (44), and when the crawler outer plate (42) slides to a preset position through the dovetail groove (44), the crawler outer plate (42) and the crawler inner plate (41) are locked in position through a spring pin (45).
  7. 7. The pultrusion pulling system of claim 5, wherein, The slip ring electric brush (6) or the wireless electric energy receiving end is arranged on the track inner plate (41), a mutually matched power supply interface (46) is arranged on the joint surface of the track inner plate (41) and the track outer plate (42), and when the track outer plate (42) is arranged on the track inner plate (41), the piezoelectric ultrasonic transducer (5) is connected with the slip ring electric brush (6) or the wireless electric energy receiving end through the power supply interface (46).
  8. 8. The pultrusion pulling system of claim 2, wherein, The surface of the track shoe assembly (4) contacting the section bar (1) is covered with a flexible liner (47) for increasing friction force, and the flexible liner (47) is made of polyurethane or rubber; The flexible gasket (47) is provided with a plurality of avoidance holes corresponding to the positions of the piezoelectric ultrasonic transducers (5), the front end of each piezoelectric ultrasonic transducer (5) is provided with an acoustic impedance matching layer, and the acoustic impedance matching layers penetrate through the avoidance holes and are flush with the surface of the flexible gasket (47), so that the flexible gasket (47) and the acoustic impedance matching layers are simultaneously contacted with the section bar (1).
  9. 9. The pultrusion pulling system of claim 1, wherein, The crawler belt traction device further comprises a rotary encoder arranged on a crawler main shaft of the crawler belt traction module (3), and the control unit is in communication connection with the rotary encoder; The control unit is configured to synchronously receive acceleration signals which are output by the rotary encoder and reflect the change of the speed of the main axis of the crawler belt, and when signals which are sent by the chain tension acquisition module and indicate that the tension gradient shows nonlinear sharp increase are received, and the acceleration signals show descending or stagnation trend, the system is judged to enter an energy storage state of stick-slip vibration, and the operation of increasing the output power of the acoustic energy injection module is triggered.
  10. 10. A pultrusion pulling method applied to a pultrusion pulling system according to any of the claims 1 to 9, characterized by comprising the steps of: The caterpillar traction module (3) clamps the profile (1) through the track plate assembly (4) and outputs drawing force, and meanwhile the acoustic energy injection module generates high-frequency mechanical waves with preset reference power, and the clamped profile (1) is used as a stress wave conduction medium to conduct vibration energy to the interface of the profile (1) and the pultrusion die (2); the control unit continuously collects mechanical data of the traction system through the chain tension collection module and calculates tension gradient showing the change of tension along with time in real time; When the control unit receives a signal which is sent by the chain tension acquisition module and indicates that the tension gradient presents nonlinear sharp increase, a power compensation instruction is issued to increase the output power of the acoustic energy injection module; the acoustic energy injection module after the power is increased reduces the friction coefficient between the profile (1) and the pultrusion die (2) through an acoustic softening effect.

Description

Pultrusion traction system and method for actively inhibiting stick-slip vibration Technical Field The invention relates to the field of pultrusion equipment, in particular to a pultrusion traction system capable of actively inhibiting stick-slip vibration. The invention also relates to a pulling-extruding traction method for actively inhibiting the stick-slip vibration. Background Pultrusion is a process for continuously manufacturing composite profiles, in the prior art, a caterpillar traction module is generally adopted and a grip-and-pull action is performed by using a track shoe assembly, and the profile generates great friction resistance with a die interface in a pultrusion die due to material solidification and wall shearing action. In order to overcome the friction resistance and avoid sliding between the track shoe assembly and the profile, the prior art generally needs to remarkably increase the normal clamping pressure of equipment on the profile, however, due to the limited radial compressive yield limit of the composite profile, the excessive normal clamping pressure easily causes structural crushing or internal microcrack damage of the profile, whereas if the normal clamping pressure is reduced for protecting the profile, the traction force cannot overcome the high resistance of the die end, systematic stick-slip vibration is easily induced, and the drawing instability and the surface quality of the product are seriously affected. Disclosure of Invention The invention aims to provide a pultrusion traction system capable of actively inhibiting stick-slip vibration, which aims to solve the technical contradiction that in the prior art, normal clamping force is excessively increased to overcome high static friction resistance between a profile and a pultrusion die, so that the profile is mechanically crushed and damaged or the stick-slip vibration is caused when the clamping force is insufficient. In order to solve the technical problems, the invention specifically provides the following technical scheme: A pultrusion pulling system comprising: The caterpillar traction module comprises a caterpillar plate assembly which contacts the profile and performs clamping and drawing actions; the chain tension acquisition module is arranged at a stress node of a traction chain of the caterpillar traction module; the acoustic energy injection module is embedded in the track shoe assembly and is configured to generate high-frequency mechanical waves and conduct vibration energy to the interface of the profile and the pultrusion die by taking the clamped profile as a stress wave conduction medium; The control unit is in communication connection with the chain tension acquisition module and the acoustic energy injection module and is configured to increase the output power of the acoustic energy injection module when receiving a signal which is sent by the chain tension acquisition module and indicates that the tension gradient shows nonlinear sharp increase, so as to reduce the friction coefficient between the profile and the pultrusion die through an acoustic softening effect. Further, the acoustic energy injection module comprises a two-dimensional array resonant cavity machined on the metal framework inside the track shoe assembly and a plurality of piezoelectric ultrasonic transducers coaxially embedded in the resonant cavity. Furthermore, the piezoelectric ultrasonic transducer is a shear type piezoelectric transducer, and the output end face of the shear type piezoelectric transducer generates shear deformation parallel to the drawing direction of the section bar so as to excite longitudinal waves with the propagation direction parallel to the drawing direction in the section bar, thereby utilizing the solid medium characteristic of the section bar to reversely feed back energy to the pultrusion die. Further, still include power module, power module includes: the collecting ring or the wireless electric energy transmitting end is arranged on the frame of the caterpillar traction module and along the movement track of the traction chain; and a slip ring brush or a wireless power receiving end which is arranged on the track shoe assembly and moves synchronously with the track shoe assembly. Further, the track shoe assembly comprises a track inner plate and a track outer plate, wherein the track inner plate is fixed on the traction chain, the track outer plate is detachably connected with the track inner plate, and the piezoelectric ultrasonic transducer is integrally formed with the track outer plate. Further, the track outer plate is slidably connected with the track inner plate through a dovetail groove, and when the track outer plate slides to a preset position through the dovetail groove, the track outer plate and the track inner plate are locked at the position through a spring pin. Further, the slip ring electric brush or the wireless electric energy receiving end is arranged on the track inner pla