THE EXPERIMENTAL ANALYSIS OF DYNAMIC PARAMETERS TO THE VIBRATING SCREEN WITH FUNCTION IN RESONANCE

Transcription

1 THE EXPERIMENTAL ANALYSIS OF DYNAMIC PARAMETERS TO THE VIBRATING SCREEN WITH FUNCTION IN RESONANCE TONT VALENTIN, ait drd ing Univeritatea Dunarea de Jo Galati JÄGER DANIELA LIDIA, prof ing Scoala gimnaziala Ovid Tenuianu Fagara Introduction In thi paper i preented the method of experimental analyi for etablih the dynamic parameter to the vibrating creen, with function in reonance The vibrating creen with function in reonance i maked by: uperior frame, inferior frame, balancer, elatic group of the eccentric rod, driving haft, elatic group for compling, upport Screen are in the inferior and uperior frame It mut be to achieve the vibrating level to the direction of the eccentric rod under entering angle who formed thee with the orizontal poition For maintain the operating condition in reonance, it wa adopted the contructif ytem with the eccentric rod and for perturbation with eccentric buh fixed to driving haft In thi paper are preent the next dynamic parameter of the vibrating creen with function in reonance: rigidity coefficient, damping factor, vibrating ma The experimental analyi The rigidity coefficient wa etablih both for the elatic group of the the eccentric rod and for the elatic group of the coupling tooth the uperior and inferior frame Thu, depending on the number of element rallyed in parallel, we have: k k, () k k when: k and k are the rigidity equivalent coefficient to the elatic group of eccentric rod and for the coupling group and - the number of the rubber element rallied in parallel of the elatic group k - the rigidity coefficient to one rubber element The coefficient k wa etablihed through tet to a group by 5 piece rubber element, through recording of deforming tep for hearing train Thu, for one parallelipipedic element with ize mm, by rubber SAB with hardne 45 h A, after tet, on obtained the value k 78 N/m The total number of element to the group i 8 6 piece for eccentric rod and 8 4 piece for group of the coupling The rigidity equivalent coefficient are:

2 k 848 N/m and k 5696 N/m The ma of the movable element, in vibrating movement, make by the total ma m, of uperior frame and total ma m of inferior frame Experimental wa obtened: m 45 kg and m 68 kg Damping factor wa etablihed uing the method of the ytem anwer to the free vibration The logitic decrement of the moving ytem, formed at rubber element rallied in parallel i: x p it ln, () x where: x i the limit moving of ytem, conidered to the initial moment t x - the limit moving of ytem to the moment t - the erial number of the limit moving of ytem The logitic decrement of the moving for one rubber element :, () p it which i total number of the rubber element rallyed in parallel For a ytem formed by = element rallyed in parallel, on have: 4 p it ln,6 4 5 p it,6 or, The angle of internal lo who reflect the diipation of energy i: tg (4) For the antivibrating ytem formed by element: p it it arctg,6 or it arctg, 98 rad,4 In the cae of the total antivibrating ytem, formed by 48 element, on have: p it p it (5) So, for the vibrating creen with function in reonance, who ha 48 antivibrating rubber element, we have: 48 p it,6,77,,77 it arctg,4 rad,4 The angle of lo for one antivibrating element will be:, arctg arctg, 5 rad,4 The checking of operational factor uing the experimental reult For verify the aumption and the theoretical bae on ue the relation: G k and G k On etablih the next initial date: - the eccentricity of the buh r, in m

3 m - the report of ma m - the conitency factor to the rolling track f r - the equivalent diameter to the rolling track for the bearing of driving haft, d, in m The relation of gravel etablih the next parameter: - the amplitude relative: A r k (6) k k m k k - the amplitude of the ma m and m : A A A A (7) - the power for the driving haft: N,5 F z dr f r r in, (8) where: z i the number of the couple by identical bearing - lagging between the force and the elatic element of eccentric rod - the total power for moving: N N m, (9) where i output to tranmiion the energetic tide by engine to diving haft 4 Concluion The method of experimental invetigation to the parameter cover the neceary of date for etablihed the performance of vibrating creen with function in reonance Following the theoretical date and experimentaly it wa eatablihed the gravel relation and the teting method for vibrating creen with function in reonance 5 Reference [] BRATU, P, Dinamica ciurului vibrator bimaic cu functionare in rezonanta, St Cerc Mec Apl, 47,6,988 [] MUNTEANU, M, Introducere in dinmaica mainilor vibratoare, Editura Academiei, Bucureti, 986 [] RADES, M, Metode dinamice pentru identificarea itemelor mecanice, Editura Academiei, Bucureti, 979

4 Condition in wich limit peed link holder equipment ditch attached machinery with bae machine overhead loader TONT VALENTIN, ait drd ing Univeritatea Dunarea de Jo Galati JÄGER DANIELA LIDIA, prof ing Scoala gimnaziala Ovid Tenuianu Fagara The paper tudie condition in wich limit peed link holder equipment ditch attached machinery with bae machine overhead loader Along the abbreviate calculation on explore condition tability landportiere range the cutter plate Introduction The link holder equipment aembled to bae machine overhead loader are from the group of trench excavator In contruction to thee equipment, a large area have the operating part ort knife which, in analogy with ort bucket, have a mole ma, which take to decreae the dynamic effect in chain, increae hi peed and increae the capability of machine The coniderate element Unloading of the earth off knife do to fore part, which take increae the croed peed of knife But are ome condition which limit the peed of chain, that i: cutting peed mut aure gravitation dicharge of the cutter knife the path to fall of earth mut oin in feeding area of the conveying piral The quantitive knowledge to influence of peed chain about the performance of dicharge i very ueful in activity of proecting equipment Thee influence i etablih fuction by angle of tilt of chain and by the length pace covered by knife for earth dicharge Either the reference ytem x O y olidary with the knife and force who drive about earth particle white ma m The condition for equilibrium for earth particle on knife urface in the reference ytem x O y i: m g co m g in m a () or x g co in, () where: g i gravity acceleration, - the angle of declivity chain, repectively of knife urface - frictional coefficient earth knife

5 Integrating equation () on etablih: x g co in t () where t i the neceary time for earth dicharge to the knife The relative peed of earth particle, v, who drop to the knife i: v g lc g co in (4) where l c i length urface of knife The abolute peed of particlegiven the fixed ytem xoy earth i: where v i the chain peed Concluion v v v v v in, (5) For enure the bet run of equipment on elect adequate the chain peed (correpondingly with the machine peed on the work proce) and the dicharge parmeter of operating part Thee reduce the earth overflowing in the delved ditch 4 Reference [] ST MIHAILESCU, a, Maini de contructii, vol II, EdTehnica, Bucureti, 988 [] I PETREA, a, Maini de contructii, Note de cur, Facultatea de Inginerie Braila, 8