Design Of Hydraulic Braking System And Monitoring Device For Hoist

The hoist hydraulic braking system of Chenmanzhuang mine as the research object,it is an important part to ensure the safe operation of the hoist,lifting accidents,especially the rope breaking,falling container and other major accidents,mainly because of its failure,it is composed of hydraulic station,brake,Chen Manzhuang mine hydraulic station for high pressure secondary braking hydraulic station."Coal mine safety regulations" article 425 regulation: safety brake must be parallel redundant oil return channel,but according to the regulation design and is widely used with pressure reducing valve of secondary braking hydraulic station there are two mistakes: one is to truncate the channel in parallel two valve,not only is there not redundant and hidden danger than a valve failure probability increases;Two valves are indirectly connected in parallel on one oil return channel.This thesis corrected the errors and innovative design safety brake oil return channel parallel redundant with secondary braking hydraulic station of the reducing valve by AMEsim simulation analysis,obtained has good performance under high pressure,and without reducing valve than active secondary braking hydraulic station is more suitable to work under high pressure,in order to achieve the real redundancy valve position monitoring device is designed.Manual braking is the last protection,is the safety brake failure to take remedial measures,the existing no secondary braking,innovative design of the manual secondary braking device without electricity delay and by mechanical delay valve delay.Aiming at the defects of broken shaft,stuck resistance and oil leakage existing in the hydraulic cylinder rear type disc brake,and the structure has not changed for decades,innovative design of a new disc brake with unique structure,compared with the former,the external multiple shafts instead of a central shaft connection,put an end to the broken shaft failure;Using two concentric and floating axis movement instead of three concentric and rigid axis movement,effectively avoid the stuck;Using one seal ring instead of three seals effectively prevents oil leakage.A disc spring seat sensor is designed to monitor the positive braking force,and the structure of the disc spring seat sensor is optimized by ANSYS,so that the strain at the patch and disc spring force reach a linear relationship,and the test is verified,the test curve is consistent with the theory of the former,according to the monitoring of the positive braking force to judge whether to allow driving.How can hoist brake and the effect depends on the braking torque,traditional measuring applying tension roller rotation and lever obtuse Angle,applied thrust into acute Angle,there are errors from measurement principle,the innovation design whatever roller transfer power and arm keep vertical accurate involute shape dynamic torque measurement device.According to the measured braking torque and monitored braking pressure,the braking torque can be monitored online.The hardware and software of the monitoring hydraulic brake system are developed.The hardware master controller is designed with ARM special circuit,which has the functions of self-diagnosis of sub-module and parameter configuration,and can communicate with the acquisition device digitally.Software program module,mainly can be divided into data acquisition module,alarm and fault judgment module,CAN bus communication module,LED display module.By collecting,analyzing,processing and displaying the signals of brake clearance,brake positive pressure,brake torque and oil pressure,the function of fault diagnosis,real-time alarm and locking start is realized.The field application shows that the hydraulic brake system with monitoring function developed in this thesis has a good application effect on the hoist in Chenmanzhuang mine.