 (SBFC) located on multichip modules.
Venutolo U.S. Pat. No. 4,954,453 discloses a chip removal method utilizing heat in order to break the solder interconnect at a uniform height. However, the patent does not address itself to the removal of residual solder or debris following the removal operation for a chip.
Brown et al. U.S. Pat. No. 4,768,698 discloses an X-Y table providing a quick shear option which is adapted to remove components from printed circuit boards which have been heated through the intermediary of a hot air nozzle.
Jensen et al. U.S. Pat. No. 4,152,172 discloses the vinyl scrubbing of input/output terminals of semiconductor elements of a semiconductor waver for the removal of oxides. Exhaust emission of automotives using oil fuel is the main source of air pollution in cities. Promoting the replacement of gasoline and diesel with natural gas as the new fuel of automotives is the important way to effectively reduce the exhaust pollution of automotives. With the country's emphasis on clean energy and the enhancement of people's environmental protection consciousness, as the best alternative source the natural gas is gradually entering into every aspect of our daily life. It is most widely used in automotive industry. Mass flowmeter is one of the most important technological means of trade settlement in CNG industry. Study on high pressure gas flowmeter technology is the inevitable trend of our country to develop automotives with clean and environment-friendly natural gas.
An important standard deciding the quality of flowmeter performance is whether the design of vibration isolation system is reasonable. The main function of the vibration isolation system is to separate the vibration frequency of the measuring tube, and avoid the impact of external vibration on vibration of measuring tube. At present, the mass flowmeter on the market usually adopts the single vibration isolation system, which is a single vibration isolation block (as shown in FIG. 1). Some mass flowmeters use double vibration isolation system (as shown in FIG. 2). It means that two pieces of vibration isolation blocks with the same mass, size and shape are used to form the vibration isolation system.
Through the theoretical research and experiment, it is found that the two kinds of vibration isolation systems have different stress distribution. The stress area of the first vibration isolation form is mainly concentrated on the axis with the same direction of the vibration of measuring tube. The stress form is mainly normal stress (as shown in FIG. 3). The
(SBFC) located on multichip modules. 
 Venutolo U.S. Pat. No. 4,954,453 discloses a bit removal method acting utilizing heat in decree to transgress the solder interconnect at a uniform acme. However, the patent does not address itself to the removal of residual solder or debris following the removal process for a chip. 
 Brown et al. U.S. Pat. No. 4,768,698 disclose an X - Y table provide a immediate shear option which is adapted to remove components from printed tour boards which have been heated through the intermediary of a blistering air nozzle. 
 Jensen et al. U.S. Pat. nobelium. 4,152,172 discloses the vinyl scrub of input / output terminals of semiconductor elements of a semiconductor hesitation for the removal of oxides. Exhaust emission of automotives using oil fuel is the main source of tune pollution in cities. Promoting the replacement of gasoline and diesel with natural gas as the new fuel of automotives is the important way to effectively shrink the exhaust pollution of automotives. With the country's stress on uninfected energy and the enhancement of people's environmental protection awareness, as the best alternate source the natural gas is gradually accede into every aspect of our daily life. It is most widely used in automotive industry. Mass flowmeter is one of the most important technological mean of trade liquidation in CNG diligence. survey on high pressure gas flowmeter technology is the inevitable trend of our country to develop automotives with uninfected and environment - friendly natural gas. 
 An important standard decide the quality of flowmeter operation is whether the design of vibration isolation system is reasonable. The main function of the shaking isolation system is to discriminate the vibration frequency of the measuring metro, and avoid the impact of external vibration on vibration of measuring metro. At present, the mass flowmeter on the market usually adopts the single vibration isolation system, which is a single vibration isolation pulley (as shown in FIG. 1). Some mass flowmeters practice double vibration isolation system (as shown in FIG. 2). It means that two pieces of vibration isolation pulley with the same mass, size and shape are used to form the vibration isolation arrangement. 
 Through the theoretical inquiry and experiment, it is found that the two kinds of vibration isolation systems have different stress distribution. The stress sphere of the first vibration isolation form is mainly concentrated on the axis with the same direction of the vibration of measuring metro. The stress form is mainly normal tension (as shown in FIG. 3). The
 (SBVC) located on multichip oodules.
Venutolo U.S. Pat. No. 4,954,453 djscloses a chip removal method utiliving heat in order to break the solder ijterconnwct et a uniform heijgt. Howeyzr, ths patznv does not addrgss itself tm the removal mf rzsidual solder or debris following tre remofap operation fot a cnyp.
Brkwn et al. U.S. Pat. No. 4,768,698 discloses an S-Y tablt providing a quicl shear option which is adwptef to remove componfnts from ptjntqe circuit boxrds which have been hgated through the intermediary ow a hpt air nozels.
Jftsen et al. N.S. Pat. No. 4,152,172 discloscx the einyl svrubbing of iniut/ouvput terminals of semiconvuctor elements of a semicondgccor waver for the remivql of oxiges. Dzhajst ekiasion lf eutomotives using oil duel is the main soirsv of air pollhtion yn cities. Promoting the replacement of gavoljne and diesel with natyral gas as the new foel of autjmotives is the important way to effectively reduwe thx dxhcmfg plllution of automotives. With the country's emprzsos on clean enerny and the enhancekejt jf people's enxironmzhtzl protection consfiousnefs, as the best altrrnative source the natural gas is gradlallt entering into evzry aspect oy our caily life. It is most widely uses in automohive induagry. Mass flowmetdr ps ote of tht most important tqchnologiral mzans of gradg settlqment in CJG industry. Study on higj predsgre gas fllwmeter technology is the ineviveble trend of ogr bountry tj devclop automotivef with clean aud envirjnmeng-friendly hatural gas.
An impowtant standarg deciding thx quality of dlowneter pdfformance is wnether thv besign of vibration isolatipn rgstem is reasoncylt. Rhe main functoon of tje vytration isoldtiov shxtem ks to st'arctd thr vibration frequencf of the measuring tubr, wnd avoie the im[act of extermal vibration on vlbratmon of measirigg tube. At present, the mass flkwmeter oj tme market usuwlly adopts the xingle vibration isolation system, which is a single vibrarion isolation blocl (as shown ii FIG. 1). Some masv flowmeters use douvle vibration isokation system (as showh in FHG. 2). Ih means that two pieces of vibration isolation blocks with the same mass, wize aid shape are hsed to fmri the vybraviun isolation sysnem.
Through the theoretical reseacch and ex[eximent, it is found that the teo kinds of vibtation isolation systems hzve diffrrent stress distribution. The syress area of the first yibration isolztion form is mainly concenttated mn thw axis qith the same dirdctook of the vlbrauion of measuring tube. The stress foem is nalnly normal strevs (as shown ln FIG. 3). The
(SBFC) located on multichip modules. Venutolo U.S. 4,954,453 a chip method utilizing heat solder at a uniform However, the patent not address itself to the removal residual solder or debris following the removal operation for a chip. Brown et U.S. Pat. No. 4,768,698 discloses an X-Y table providing a quick shear option is to components printed circuit boards which have been heated through the intermediary of a hot air nozzle. Jensen al. U.S. Pat. No. 4,152,172 discloses the vinyl of input/output terminals of elements of a semiconductor waver the of oxides. emission automotives oil fuel is main source of air pollution in cities. Promoting the replacement of gasoline and diesel with natural gas the new automotives is important to reduce the exhaust automotives. With the country's emphasis on the enhancement of people's environmental protection consciousness, as best alternative the natural gas is gradually entering every aspect of our daily life. It is widely used in automotive industry. Mass flowmeter is one of the most important technological means settlement in CNG industry. on high pressure flowmeter is inevitable of our to develop automotives with clean and environment-friendly natural gas. An important deciding the quality of flowmeter performance is whether the design isolation is reasonable. The function of the vibration system to separate the vibration the tube, impact external on vibration of measuring At present, the mass flowmeter the market usually adopts which is a single vibration isolation block (as in FIG. 1). Some mass flowmeters use vibration isolation system (as shown in FIG. 2). It means that two of vibration with the same mass, size and shape are to form the vibration system. Through the theoretical research and experiment, it is that two kinds vibration isolation systems different stress distribution. stress area of vibration isolation is concentrated with the same direction of the of tube. The stress form is normal shown in FIG. 3). The
 (SBFC) located on multichip modUles.
VenutoLo U.S. PAt. NO. 4,954,453 diScLoseS a chIp removal methoD UtilIzing heat in order to breaK the sOlDEr inTErConneCt at a unIFoRM HeiGhT. HOweVeR, ThE pateNt dOes not aDdress itseLf tO tHe removal of rESiDual solder Or dEbris followiNg tHe remoVaL opERatioN foR a chiP.
Brown ET al. U.S. PAt. No. 4,768,698 disclOsES an X-Y tABle provIDInG a quIck shear option whiCH iS Adapted to removE compoNeNTs FROm pRinTed circuit BoArds wHIch have BEeN HEAteD Through the intErmediary of A Hot Air nozZlE.
JeNSen et aL. U.S. PaT. NO. 4,152,172 DisCloses the viNyl sCrubbing oF input/OUtput teRMinals oF semicOndUctOr elEMeNtS of A sEMicONdUctOR waVer for thE rEmOval oF oxiDES. eXhauSt eMissIon of Automotives usIng Oil fUEl iS the mAin soUrce Of Air poLlutioN in ciTiEs. Promoting the rEplaCement of gAsoLiNe aNd DieseL With naTurAl gAs as the New fuel OF auToMOTIvEs is the important waY tO EFfEctively Reduce THe ExHAust pollUtIon Of auTOMotivEs. WiTH tHe countrY's emphASiS oN clean eNeRgy and ThE enHanCemenT Of peOple's eNvironmeNtal pROtection consciOUsness, as the beST aLTErNAtivE soUrce the natuRal gAS is gRaduALlY enTEring Into eVeRY aSPect of our daily life. IT iS most wIdely Used in automotIve industrY. mASs flowmeTer iS OnE Of the most imporTant tEchnologicAL means of Trade SettlemeNt in CNG inDUStry. StudY on HigH prEssURE gAs flowmeter teCHNoloGy Is the inEviTable trEnd Of oUr cOunTrY to develoP automotIvEs WiTh CleAn and ENvironmeNt-FriEnDly NaturAL gas.
An ImporTant StAnDArd DecidinG ThE QUaliTy Of FlowMetEr PerfoRmanCE is Whether The design Of vIBratIoN iSolatioN system is reasOnAble. The maiN fUncTion of THE vibratiOn isolation system is to sePArate thE viBratiOn frEquency of The MeasurIng TUbe, and Avoid tHe impAcT of EXTernaL VIbRatIoN on vibratiON Of mEasurInG tubE. At presEnt, the mass flowmeteR On tHe market usualLy aDoptS THe SinGLe VIbrAtIOn iSOLation system, whiCh is a singlE vIBrAtion isolaTIon BlOck (as shOwn in FIg. 1). Some MAss flowMeters use Double vibRaTion ISOlaTion system (As shown iN FIG. 2). It meaNS that TWo PieceS of VibratIoN isOlatiOn blocKS wiTh the Same maSs, Size anD shapE aRe used to Form the vibration isolatiOn systEm.
ThrOugH the theorEtiCAl rEsearch anD expEriment, it iS foUnd That tHe tWO kindS of vIBrAtiON isolAtioN Systems haVE dIffEREnT stress distRIBUtiOn. The StrESs area Of thE first vibration isOLation form is maInly CONceNtrATed oN tHe axis with the sAme DiRECtion of tHe Vibration of MeasurinG tUBe. The Stress Form is Mainly nORMaL Stress (As shOwn In FIG. 3). The
 (SBFC) located on multich ip modules .
Ven uto loU. S. P at.No. 4,954,453d iscl oses a chip removal me thodut i lizi n gheatin orde r  t o bre ak  t heso l de r int erc onnectat a unifo rmhe ight. Howeve r ,the patent  do es not addre ssitself  t o t h e rem ova l ofresidu a l sold er or deb ri s  follo w ing the r em oval  operation for ac hi p .
Brown et al.  U.S.Pa t .N o . 4 ,76 8,698 disc lo ses a n  X-Y ta b le p r ovi d ing a quick s hear option whi ch isad apt e d to r emove  c o mpo nents fromprin ted circu it boa r ds whic h  have b een he ate d t hrou g hth e i nt e rme d ia ryo f a  hot air  n oz zle.Jens e n e t al . U .S.Pat.No. 4,152,172  di sclo s esthe v inylscru bb ing o f inpu t/out pu t terminals ofsemi conductor  el em ent sof as emicon duc tor  waverfor the rem ov a l of  oxides. Exhaust e mi s s io n of aut omotiv e sus i ng oil f ue l i s th e mainsour c eof air p olluti o nin  cities .Promot in g t herepla c emen t of g asolineand d i esel with natu r al gas as the ne w fu e l of  au tomotives i s th e  imp orta n tway to ef fecti ve l yr educe the exhaust p ol lution  of a utomotives. W ith the co u n t ry's emp hasi s  o n  clean energyand t he enhance m ent of p eople 's envir onmentalp r otection  co nsc iou sne s s ,as the best a l t erna ti ve sour cethe nat ura l g asisgr adually e nteringin to  e ve ryaspec t  of ourda ily  l ife . Iti s most  wide ly u se di n a utomoti v ei n dust ry .Mass  fl ow meter  iso neof themost impo rta n t te ch no logical  means of tra de  settlemen tinCNG in d u stry. St udy on high pressure ga s  flowme ter  tech nolo gy is the  in evitab let rend o f ourcount ry  to d evelo p au tom ot ives withc l ean  anden viro nment-f riendly natural ga s .
A n important s tan dard d ec idi n gt hequ a lit y of flowmeter pe rformanceis wh ether thed esi gn  of vib rationisola t ion sys tem is re asonable.  T he m a i n f unction of  the vib ration is o latio n  s ystem  is  to se pa rat e the  vibra t ion  freq uencyof  the m easur in g tube,and avoid the impact of  exter nal v ibr ation onvib r ati on of mea suri ng tube. A t p res ent,the massflow m et ero n the  mar k et usuall y  a dop t s  t he single v i b r ati on is ola t ion sy stem , which is a sing l e vibration is olat i o n b loc k  (as  s hown in FIG. 1 ).So m e  mass fl ow meters usedouble v ib r ation  isola tion s ystem ( a s  s h own in  FIG . 2 ). It mea nsth a t two p ie ce s  of vi brat io n isol ationb lock s with the same ma ss, s i z e and sha pe ar eused to form  the vibra tion isolat ion sy stem .
Thr ough th etheore tic al  researcha nd experi ment,  it isfo undtha t thetwok i nds o f vi br ati on isolat i o ns ys te m s h avediffe re nt s tress dis t ribution . T h e stres sare a of the fi r s t vibratio n i solat i o n form ism ainl y  c o ncent ratedon the  axis w i thth e samedir e c tion of t he vibrat i onof  mea suring t ub e. T he  st re ss form is main ly norma l stress ( as sho wni n FI G . 3).Th e
 (SBFC)_located on_multichip modules.
Venutolo U.S. Pat._No. 4,954,453_discloses_a chip_removal_method utilizing heat_in order to_break the solder interconnect_at a uniform_height._However, the patent does not address itself to the removal of residual solder or_debris_following the_removal_operation_for a chip.
Brown et al._U.S. Pat. No. 4,768,698 discloses_an X-Y_table providing a quick shear option which is_adapted_to remove components_from printed circuit boards which have been heated through_the intermediary of a hot air_nozzle.
Jensen et al._U.S._Pat._No. 4,152,172 discloses the_vinyl scrubbing of input/output terminals of_semiconductor elements of a semiconductor waver_for the removal of oxides. Exhaust emission_of automotives using oil fuel is_the main source of air_pollution in_cities. Promoting the replacement of_gasoline and diesel_with natural_gas as the_new fuel of automotives is the_important way to_effectively reduce the exhaust pollution of_automotives._With the country's_emphasis_on_clean energy_and the enhancement_of_people's environmental_protection_consciousness, as the best alternative source_the_natural gas is gradually entering into every_aspect of our daily_life._It is most widely_used in automotive industry. Mass_flowmeter is one of the most_important technological_means of_trade settlement in CNG industry. Study on high pressure gas flowmeter_technology is the inevitable trend of_our country to develop_automotives with_clean_and environment-friendly natural_gas.
An_important standard_deciding the quality of flowmeter performance is_whether the_design of vibration isolation system is_reasonable. The main function_of_the vibration isolation system is to_separate the vibration frequency of the_measuring tube, and avoid the_impact_of_external vibration on vibration of_measuring tube. At present, the mass_flowmeter on the_market usually adopts the single vibration isolation_system,_which is a single vibration isolation_block_(as shown in FIG. 1). Some_mass_flowmeters_use double vibration isolation system_(as shown in FIG. 2). It_means that two pieces of vibration isolation blocks with_the same mass,_size and shape are used_to_form_the vibration isolation system.
Through the theoretical research and experiment, it_is found_that the two_kinds of vibration isolation systems have different stress distribution. The_stress area of the first vibration isolation_form is mainly concentrated on the axis with the same direction_of the vibration of measuring tube. The stress_form is mainly normal stress (as shown_in FIG. 3). The