To breakdown of orgnaization of gearshift of main shaft of milling machine of a boring discuss

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1 boring of Ф of Д of HC212 of 1 introductive 　 milling machine (220mm) of main shaft diameter is Ma Gang the bed of large scale computer that 90 age of mechanism company import from Russia. Timing of main shaft of this machine tool is to pass orgnaization of a gearshift inside main shaft box and dc timing electromotor to be finished jointly. Mechanical gearshift is controlled through hydraulic pressure system, make main shaft obtains Ⅰ , Ⅱ , Ⅲ , Ⅳ 4 class rotate speed. If the graph is shown 1 times,its control a principle, y1 and Y2 control electromagnetism reversal valve respectively gearshift oil cylinder 1 with 2, drive the slide that dial fork to use gear 1 and 2 be in different working place, make main shaft gains different rotate speed. Among them 1 have gearshift oil cylinder two works place, 2 have oil cylinder 3 works place. Graph 12 breakdown phenomenon and analyse this machine tool to for some time often class of rotate speed of Ⅰ , Ⅲ is not hanged on of archives call the police. Open box of machine tool main shaft to check discovery, slip gear the Zun Duan of 1 hits wool flange because of be bumped badly and making horn is in, down to is dialing fork to drive below with gear of 2 inside tine clench the teeth, appear thereby afore-mentioned breakdown phenomena. Through meticulous observation, discover slip gear the place pouring wine cup of 2 two end does not have the right end of 1 and slip gear afore-mentioned phenomena. This shows, slip gear production quality is not the key of the problem. Does the problem go be in where? The analysis pursues 1 can see, the machine tool is in level of rotate speed of Ⅰ , Ⅲ achieves when 1DT breaks phone. If main shaft is in Ⅱ or Ⅳ archives to run state, some outside element causes electro-magnet 1DT to break phone suddenly, can give now to list a situation: 1DT breaks phone, make switch of Y1 of a powerful person arrives left, commutation oil cylinder 1 drive slip gear 1 rapid towards the left is mobile. And the gear that is located in Zun Duan right now 2 be in condition of high speed movement, two gear encounter to be able to produce acuteness attrition to bump necessarily. If this kind of circumstance exists, the Zun Duan of 1 meets slip gear surely damage, afore-mentioned breakdown can happen. The electric plan that tells machine tool of beyond the mark analyse is knowable, electro-magnet 1DT is controlled directly by PLC, and the protective function of this machine tool is more. In machining a process, be like the protection of link of other of occurrence machine tool, PLC can block all output are nodded, this broke report suddenly to offer an opportunity with respect to what give 1DT. And in this gearshift system, y1 a powerful person does not have function of the protection that break phone again. Conclude from this, accident of Y1 a powerful person breaks phone, slip gear 1 misoperation is the cause that causes this trouble. Look from field work circumstance, the machine tool appears when this breakdown calls the police, constant companion has acuteness clash, because this is farther test and verify the validity of afore-mentioned judgement. Additional, in breakdown processing, still discover gearshift oil cylinder 1 pass with 2 motion speed fast, gearshift impact is bigger. Of 3 systems transform those who reach an issue to solve to solve a problem, hydraulic pressure system begins from two respects: New type selecting of ① reversal valve Y1; ② adds speed adjustment segment in the system. If the graph is shown 2 times,the principle after transforming pursues. Choose reversal valve of homebred 24WE6D50/CFG24 electromagnetism Y3 replaces Y1. Y3 of a powerful person is taken " memory " function, do not break phone because of electro-magnet and change position of core of a powerful person. In Y3, Y2 place of mouth giving oil increased throttle group L1, L2, make gearshift oil cylinder 1, the 2 athletic rate that achieve ideal. Graph 2 　 contain 2 electro-magnet as a result of Y3 of a powerful person (4DT, 5DT) , and for " blame " relation, how from inside already occupying full PLC to output end points derivative will one control signal control 5DT (graph 3) ? If increase one output end points to control 5DT, certainly will should increase output module, want to amend echelon plan, increased to transform expense greatly thereby. For this we outputted a dot to undertake to PLC a few alter (graph 4) , solved PLC satisfactorily to output bit of insufficient problem. Drive PLC directly so electro-magnet instead drives auxiliary relay K1, K2, K3, control electro-magnet 4DT, 5DT, 2DT, 3DT next by K1, K2, K3. The Chang Kaihe that passes K1 often closes a point, make 4DT and 5DT were satisfied " blame " relation. Graph 3 graphs 4 　 undertake transforming to the hydraulic pressure of the machine tool and electrical system, after pouring horn to repair to sliding 1 left end has gear wheel, orgnaization of gearshift of machine tool main shaft returns to normal, move smooth, reliable. 4 last words pass pair of HC212 Д Ф the breakdown of orgnaization of gearshift of main shaft of 1 boring milling machine is diagnosed and the system is transformed. We get instructive below: ① diagnoses a process in the breakdown of a few sophisticated equipment in, often want to make the integration analysis of the respect such as machine, report, fluid to breakdown reason, ability finds the key of the problem. When ② is making hydraulic pressure design, the electromagnetism reversal valve of so as crucial as Y1 orgnaization should be had " memory " function, ability assures the security that equipment runs and dependability. In system of ③ hydraulic pressure, gearshift oil cylinder should have favorable rate to adjust function, lessen gearshift impact as far as possible. CNC Milling CNC Machining