Research On Embedded Brakesystem Of High Speed Rapier Loom

Weaving manufacturing process of the high-speed rapier loom can't be separated from interaction of electromagnetic clutches and brakes with weaving process.The response speed of the control system and parking angular accuracy will cause an important influence on fabric quality and production efficiency.At present,brake control system of domestic looms has a series of problems,including slow response speed and low parking angular accuracy after braking.In order to improve brake effect of looms,the author develops the embedded clutches and brake control system of the high-speed rapier loom and conducts debugging and application on the spot.The author will study from the following aspects:First of all,this thesis introduces the automatic operation process of loom and five operation processes of weaving,and analyses the specific functional requirements of the brake control system of loom.Through the simulation in the environment of MATLAB/Simulink,the relationship between excitation current and transfer torque in electromagnetic brake is studied and analyzed;Ansoft electromagnetic finite element model is established,and the relationship curves of current,back EMF and time in the process of electromagnetic brake suction are obtained by simulation,and the time lag in the braking process of electromagnetic brake is analyzed.Thirdly,through the research and analysis,the change of load force can be inferred from the moment of inertia curve of the spindle running to different angles,which also affects the degree of brake angle slip.Based on the above research results,the control system framework of this paper is analyzed and formulated.Furthermore,The hardware system with STM32F103RCT6 microcontroller as the core is designed,combining with reliable electrical isolation,and the design method of photoelectric isolation is mentioned.Bidirectional thyristor is selected as switch device to ensure the response speed of hardware system.Improve all kinds of circuit protection measures.According to the overall scheme of the hardware system,the design and development of the hardware system are completed.Next,transplantation is based on the software of Free RTOS operating system.By combining with brake control system technology of the high-speed rapier loom,the author formulates a reasonable design scheme.According to technical demands,the author conducts software design and development and confirms key technical means and basic parameters of software system design through response time experiments of electromagnetic clutches and brake angle slippage experiments.By aiming at parking angular accuracy,the author combines with the fuzzy control thought to predict brake slippage angle and uses advance brake mode for software design.The author comes up with the corresponding fault disposal method to easily happened faults in clutch brake system,improving safety and reliability of the brake system.At last,Hardware test of embedded brake system of high-speed rapier loom was carried out,and field braking experiments(including data acquisition experiment of parking angle and spindle speed change experiment of braking process)were carried out on the prototype.It was verified that the design in this paper can not only control the parking angle accuracy when positioning braking at different rotational speeds,but also keep the braking process stable,meet the technological requirements,and promote spinning.The production efficiency of manufacturing is of positive significance.