HONGYI 泵PV2R1/PV2R2定量葉片泵 數(shù)控機(jī)床，壓鑄機(jī)泵
PV11R10，PV11R20
PV2PV2R1-10-F-RAA-43，PV2PV2R1-12-F-RAA-43，PV2PV2R1-14-F-RAA-43，PV2PV2R1-14-F-RAR-43，PV2PV2R1-17-F-RAA-43，PV2PV2R1-19-F-RAA-43，PV2PV2R1-23-F-RAA-43，PV2PV2R1-25-F-RAA-43，PV2PV2R1-31-F-RAA-43，PV2PV2R1-31-L-RAA-43，PV2PV2R1-6-F-RAA-43，PV2PV2R1-8-F-RAA-43，PV2PV2R2-33-F-RAA-41，PV2PV2R2-41-F-RAA-41，PV2PV2R2-47-F-RAA-41，PV2PV2R2-53-F-RAA-41，PV2PV2R2-59-F-RAA-41，PV2PV2R2-65-F-RAA-41，PV2PV2R2-65-F-RAL-41，PV2PV2R2-75-F-RAA-4103，PV2PV2R3-116-F-RAA-31，PV2PV2R3-116-F-RLB-31，PV2PV2R3-76-F-RAA-31，PV2PV2R3-94-F-RLB-31，PV2PV2R4-184-F-RAAA-30，pv2r1-10，pv2r1-10-f-raa-40，PV2R1-10-F-RAA-41，pv2r1-10-f-raa-4222，pv2r1-10-f-raa-43，PV2R1-12-FR，PV2R1-12-F-RAA-41，PV2R1-12-F-RAA-43，pv2r1-12-f-rar-41，pv2r1-14-f-r，PV2R1-14-F-RAA-41，PV2R1-14-F-RAA-43，PV2R1-14-F-RAR-43，pv2r1-17，PV2R1-17-F-RAA-41，PV2R1-17-F-RAA-43，pv2r1-17-f-ral-41，pv2r1-17-l-raa-41，PV2R1-19-F-RAA-41，PV2R1-19-F-RAA-43，PV2R12-10-41-F-REAA-43，PV2R12-12-26-F-REAA-43，PV2R12-12-26-F-REAR-42，PV2R12-12-53-F-RELA-43，PV2R12-14-53-F-REAA-43，PV2R12-14-53-F-RFAR-43，PV2R12-19-41-F-REAA-43，PV2R12-19-65-F-REAA-43，PV2R12-23-59-F-REAA-43，PV2R12-25-33-F-REAA-43，PV2R12-25-47-F-REAA-43，PV2R12-25-59-F-REAA-43，pv2r1-23，PV2R12-31-33-F-REAA-43，PV2R12-31-33-F-REAR-4326，PV2R12-31-59-F-REAA-43，PV2R12-31-65-F-REAA-43，pv2r1-23-f-raa-41，PV2R1-23-F-RAA-43，pv2r1-25-f-raa，PV2R1-25-F-RAA-41，PV2R1-25-F-RAA-43，pv2r1-25-l-raa-41，PV2R12-6-59-F-REAA-43，PV2R12-6-65-F-REAA-43，PV2R12-8-33-F-RFAR-43，pv2r1-28-f-raa-41，pv2r1-31，PV2R13-10-116-F-REAA-43，PV2R1-31-F-RAA41，pv2r1-31-f-raa-41，PV2R1-31-F-RAA-43，pv2r1-31-f-rab-41，PV2R1-31-L-RAA-43，pv2r1-6-f-raa，pv2r1-6-f-raa-40，PV2R1-6-F-RAA-41，pv2r1-6-f-raa-4222，PV2R1-6-F-RAA-43，pv2r1-6-l-raa-41，pv2r1-8，pv2r1-8-f-raa-41，PV2R1-8-F-RAA-43，PV2R2-，pv2r2-26，pv2r2-26-f-raa，pv2r2-26-f-raa-41，pv2r2-33，pv2r2-33-f-r，pv2r2-33-f-raa-41，pv2r2-33-f-rar-41，PV2R23-41-116-F-RAAA-41，PV2R23-41-94-F-REAA-41，pv2r2-41-f-raa，pv2r2-41-f-raa-40，PV2R2-41-F-RAA-41，pv2r2-41-l-raa-41，PV2R24-33-136-F-REAA-31，pv2r2-47，pv2r2-47-f-r，PV2R2-47-F-RAA-41，PV2R24A-41-FRAAA-10，pv2r2-53-f-r，PV2R2-53-F-RAA-41，PV2R2-59-F-RAA-41，pv2r2-59-f-rab-41，pv2r2-65，PV2R2-65-F-RAA-41，pv2r2-65-f-raa-4118，PV2R2-65-F-RAL-41，PV2R2-75-F-RAA-4103，PV2R3，pv2r3-116-f-raa-31，PV2R3-116-F-RLB-31，pv2r3-116-l-raa-31，pv2r3-116-l-rab-31，pv2r3-125-f-raa-31，PV2R3-136-F-RAA-31，PV2R34-116-153-L-REAA-31，pv2r34-116-237，PV2R34A-76-FRAAA-10，pv2r3-52，pv2r3-52-f-raa-31，pv2r3-52-l-raa-31，pv2r3-60-f-raa-31，pv2r3-66-l-raa-31，pv2r3-76，PV2R3-76-F-RAA-31，pv2r3-76-l-raa-31，pv2r3-85-f-raa-31，PV2R3-94-F-RAA-31，PV2R3-94-F-RLB-31，pv2r3-94-l-raa-31，PV2R4-136-F-RAA-30，PV2R4-153F-RAA-30，pv2r4-153-f-raa-30，PV2R4-184F-RAA-30，pv2r4-184-f-raa-30，PV2R4-184-F-RAAA-30，pv2r4-184-f-ral-30，pv2r4-184-l-raa-30，pv2r4-184-l-ral-30，PV2R4-200F-RAA-30，pv2r4-200-f-raa-30，pv2r4-200-l-raa-30，pv2r4-237，PV2R4-237F-RAA-30，pv2r4-237-f-raa-30，pv2r4-237-f-ral-30，PV2R4A-138-FRAA-10，PV2R4A-162-FRAA-10，PV2R4A-193-FRAA-10，PV2RPV2R12-10-41-F-REAA-43，PV2RPV2R12-12-26-F-REAA-43，PV2RPV2R12-12-26-F-REAR-42，PV2RPV2R12-12-53-F-RELA-43，PV2RPV2R12-14-53-F-REAA-43，PV2RPV2R12-14-53-F-RFAR-43，PV2RPV2R12-19-41-F-REAA-43，PV2RPV2R12-19-65-F-REAA-43，PV2RPV2R12-23-59-F-REAA-43，PV2RPV2R12-25-33-F-REAA-43，PV2RPV2R12-25-47-F-REAA-43，PV2RPV2R12-25-59-F-REAA-43，PV2RPV2R12-31-33-F-REAA-43，PV2RPV2R12-31-59-F-REAA-43，PV2RPV2R12-31-65-F-REAA-43，PV2RPV2R12-6-59-F-REAA-43，PV2RPV2R12-6-65-F-REAA-43，PV2RPV2R12-8-33-F-RFAR-43，PV2RPV2R13-10-116-F-REAA-43，PV2RPV2R23-41-116-F-RAAA-41，PV2RPV2R23-41-94-F-REAA-41，PV2RPV2R24-33-136-F-REAA-31，PV2RPV2R34-116-153-L-REAA-31
YBE-8，YBE-16，YBE-25，YBE-32，YBE-40，YBE-50，YBE-63，YBE-80，YBE-100，YBE-125，YBE-160，YBE-200
2520V15A6-1AB22R，2520V14A2-1AC22R，2520V14A3-1AB22R，2520V14A3-1AD22R，2520V14A4-1AC22R，2520V14A5-1AB22R，2520V14A8-1AD22R，2520V14A9-1AC22R，2520V15A10-1AC22R，2520V14A12-1AC22R，2520V14A14-1AB22R，2520V14A14-1AD22R，2520V10A9-1AB22R，4535VQ60A35-1BB22R，4535VQ60A25-86DB22R，4535VQ50A35-1BB22R，4535VQ60A25-86DA22R，2520V12A12-1AB22R，2520V10A8-1AB22R，2520V10A8-1AD22R，2520V10A7-1AD22R，2520V10A9-1AC22R，45VQ60A-1D22L，2520V10A10-1AB22R，2520V10A14-1AC22R，2520V10A2-1AB22R，2520V10A12-1AB22R，2520V10A12-1AD22R
4535VQ66A38-86AA22R
45VQ42A-86B22R，45VQ42A-86A22R，2520V10A10-1AC22R，45VQ60A-1C22L
2520V12A7-1AC22R，2520V12A6-1AD22R，2520V12A7-1AB22R，2520V12A9-1AB22R，2520V12A8-1AB22R，2520V12A9-1AD22R，2520V12A3-1AB22R，2520V12A2-1AB22R，2520V14A11-1AD22R，2520V14A11-1AB22R，2520V14A10-1AC22R，2520V10A4-1AB22R，2520V10A4-1AC22R，2520V12A10-1AD22R，2520V12A12-1AD22R，2520V12A11-1AB22R，2520V10A7-1AC22R，2520V10A6-1AB22R，2520V10A5-1AB22R，2520V10A2-1AC22R，2520V10A6-1AD22R
4520VQ45A5-1BB22R，4520VQ42A12-86DD22R，4520VQ50A11-1CC22R
35VQ30A-1D22R，4520VQ42A11-1AB22R，35VQ38A-1A22L，3525VQ38A21-86BB22R，35VQ25A-1B22R
3525VQ38A17-1AA22R，3525VQ35A14-1CC22R，3525VQ38A14-11AA22R
3520VQ35A8-86AA22L，3525VQ25A12-1CB22R，3525VQ-25A-10-1C22R，3520VQ30A8-1CC22R，3520VQ38A14-1AA22R，3520VQ30A8-1AA22R，3520VQ30A14-1AA22R，3520VQ35A14-1BB22R，3520VQ30A11-1BB22R，3520VQ-38A-5-1C22R，3520VQ30A5-1DC22R
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節(jié)流調(diào)速回路中調(diào)速閥前后壓差壓力分析
本文蘇州逐利家跟大家探討下節(jié)流調(diào)速回路中調(diào)速閥的前后壓差壓力分析。
在圖1所示的液壓系統(tǒng)中，液壓泵為定量泵，換向閥為三位四通O型電磁換向閥，調(diào)速閥裝在液壓缸的回油路上，所以這個(gè)回路是調(diào)速閥回油節(jié)流調(diào)速回路。
液壓系統(tǒng)的故障現(xiàn)象是：在外載荷增加時(shí)，液壓缸的運(yùn)動(dòng)速度出現(xiàn)明顯的下降趨勢。這個(gè)現(xiàn)象與調(diào)速閥的調(diào)速特性顯然是不一致的。
檢測與調(diào)試發(fā)現(xiàn)，液壓系統(tǒng)中液壓元件工作正常。液壓缸運(yùn)動(dòng)在低載時(shí)，速度基本穩(wěn)定，增大載荷時(shí)，速度明顯下降。調(diào)節(jié)溢流閥的壓力：將溢流閥的壓力調(diào)高時(shí)，故障現(xiàn)象基本消除；將溢流閥的壓力調(diào)低時(shí)，故障現(xiàn)象表現(xiàn)非常明顯。
調(diào)速閥用于系統(tǒng)調(diào)速，其主要原理是利用一個(gè)能自動(dòng)調(diào)整的可變液阻（串聯(lián)于節(jié)流閥前的定差式減壓閥）來保證另一個(gè)固定液阻（串聯(lián)于減壓閥后的節(jié)流閥）前后壓差基本不變，從而使經(jīng)過調(diào)速閥的流量在調(diào)速閥前后壓差變化的情況下保持恒定，于是執(zhí)行機(jī)構(gòu)運(yùn)動(dòng)速度在外載荷變化的工況下仍能保持勻速。
調(diào)速閥中，由于兩個(gè)液阻是串聯(lián)的，所以要保持調(diào)速閥穩(wěn)定工作，其前后壓差要高于節(jié)流閥作調(diào)速用時(shí)的前后壓差。一般，調(diào)速閥前后壓差應(yīng)保持在0.5～0.8MPa壓力值范圍，若小于0.5MPa時(shí)，定差式減壓閥不能正常工作，也就不能起壓力補(bǔ)償作用。顯然節(jié)流閥前后壓差也就不能恒定，于是通過調(diào)速閥的流量便隨外載荷變化而變化，執(zhí)行機(jī)構(gòu)的速度也就不穩(wěn)定。
要保證調(diào)速閥前后壓差在外載荷增大時(shí)仍保持在允許的范圍內(nèi)，必須提高溢流閥的調(diào)定壓力值。另外，這種液壓系統(tǒng)執(zhí)行機(jī)構(gòu)的速度剛性，也要受到液壓缸和液壓閥的泄漏、減壓閥中的彈簧力、液動(dòng)力等因素變化的影響。在全載荷下的速度波動(dòng)值最高可達(dá)4%。
在圖2(a)所示回路中，液壓油經(jīng)單向閥進(jìn)入液壓缸的有桿腔頂起重物上升，無桿腔的油液直通油箱。液壓缸下降行程靠自重下降，有桿腔的油液經(jīng)調(diào)速閥回油箱，即相當(dāng)于調(diào)速閥回油節(jié)流調(diào)速，因此液壓缸下降速度應(yīng)該穩(wěn)定。但這個(gè)回路的液壓缸下降時(shí)速度不穩(wěn)定。
液壓缸下降時(shí)液壓泵已卸荷，液壓缸有桿腔的壓力只決定于重物，與液壓泵輸出壓力無關(guān)，因此有桿腔油液壓力決定于載荷和活塞面積。
調(diào)速閥中定差式減壓閥要能正常工作，調(diào)速閥前后壓差必須達(dá)到0.5～0.8MPa。顯然上述回路速度不穩(wěn)定的原因是調(diào)速閥前后壓差較低。要提高調(diào)速閥前后壓差，可減小液壓缸活塞的面積，但這往往比較困難。如圖2(b)所示，將二位三通閥改為二位四通閥，使液壓缸下降時(shí)，無桿腔輸入壓力油，這時(shí)系統(tǒng)壓力由溢流閥調(diào)定，液壓泵輸出的壓力油一部分進(jìn)入液壓缸，一部分由溢流閥溢回油箱。液壓缸下降的速度由調(diào)速閥調(diào)定，調(diào)高溢流閥的調(diào)整壓力，調(diào)速閥前后壓差也相應(yīng)增大，保證了調(diào)速閥正常工作的壓差，液壓缸的速度就符合調(diào)速閥回油節(jié)流調(diào)速的規(guī)律，不會(huì)隨載荷變化而變化，液壓缸就能穩(wěn)定地下降。
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