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液壓系統(tǒng)減壓回路元件的設(shè)置問題分析
在液壓系統(tǒng) 中使用減壓閥的減壓回路(圖1),主要作用是使回路中的某一油缸或某一行程以低于溢流閥設(shè)定壓力的情況下工作。帶單向閥的減壓閥是爲(wèi)了活塞返回時,油流不經(jīng)減壓元件而從單向閥通過。
【問題1】減壓回路設(shè)計要注意的問題
(1)先導(dǎo)式減壓閥的洩漏量問題
要注意先導(dǎo)式減壓閥的洩漏量比其他控制閥大的情況,這種閥的洩漏量可多達(dá)1L/min以上,而且隻要閥處于工作狀態(tài),洩漏始終存在。在選擇液壓泵容量時,要充分考慮到這一點。同時還應(yīng)注意,減壓閥的最低調(diào)節(jié)壓力,應(yīng)保證一次壓力與二次壓力之差爲(wèi)0.3MPa。
(2)二次壓力不穩(wěn)定問題
減壓閥主閥芯阻尼孔堵塞,使減壓閥出口油液不能順利流入主閥和導(dǎo)閥之間的容腔,導(dǎo)閥也就降低了對減壓閥出口二次壓力的控制作用,造成二次壓力不穩(wěn)定。
【問題2】減壓回路元件設(shè)置問題
如圖2所示,減壓閥3后支路(油缸2)的壓力要比主缸1支路的油液壓力低,稱爲(wèi)減壓回路。這種回路的問題有如下幾種。
①當(dāng)油缸2停歇時間較長時,減壓閥3后的二次壓力逐漸升高。這是由于缸2停歇時間較長時,有少量油液通過閥芯間隙經(jīng)先導(dǎo)閥排出,保持該閥處于工作狀態(tài)。由于閥內(nèi)洩漏的原因,使得通過先導(dǎo)閥的流量加大,減壓閥的二次壓力(出口壓力)增大。爲(wèi)防止這一故障,可在減壓回路中加接圖中虛線所示的油路,并在b處裝設(shè)一安全閥,確保減壓閥出口壓力不超過其調(diào)節(jié)值。
②減壓回路中液壓缸速度調(diào)節(jié)失靈或速度不穩(wěn)定。如圖2所示,當(dāng)減壓閥3洩漏(從減壓閥洩油口流回油箱的油液)大時會産生這一問題。解決辦法是將節(jié)流閥從圖中位置處改爲(wèi)串聯(lián)在減壓閥之后的a處,這樣就可以避免減壓閥洩漏對油缸2速度的影響。
SVPF-20-35 SVPF-20-55 SVPF-20-70 SVPF-30-35 SVPF-30-55 SVPF-30-70 SVPF-40-35 SVPF-40-55 SVPF-40-70 SVPF-15-35 SVPF-15-55 SVPF-15-70 SVPF-15-35-20 SVPF-15-55-20 SVPF-15-70-20 SVPF-20-35-20 SVPF-20-55-20 SVPF-20-70-20 SVPF-30-35-20 SVPF-30-55-20 SVPF-30-70-20 SVPF-40-35-20 SVPF-40-55-20 SVPF-40-70-20
HG0-08-01R-VPC HG0-10-01R-VPC HG0-13-01R-VPC HG0-16-01R-VPC HG0-20-01R-VPC HG1-25-01R-VPC-36 HG1-32-01R-VPC-36 HG1-40-01R-VPC-36 HG1-50-01R-VPC-36 HG1-63-01R-VPC-36 HG2-80-01R-VPC-36 HG2-100-01R-VPC-36 HG2-125-01R-VPC-36 HG2-145-01R-VPC-36 HG2-160-01R-VPC-36
VPVC-F12-A1-02A/03A/04A VPVC-F12-A2-02A/03A/04A VPVC-F12-A3-02A/03A/04A VPVC-F12-A4-02A/03A/04A VPVC-F20-A1-02A/03A/04A VPVC-F20-A2-02A/03A/04A VPVC-F20-A3-02A/03A/04A VPVC-F20-A4-02A/03A/04A VPVC-F30-A1-02A/03A/04A VPVC-F30-A2-02A/03A/04A VPVC-F30-A3-02A/03A/04A VPVC-F30-A4-02A/03A/04A VPVC-F40-A1-02A/03A/04A VPVC-F40-A2-02A/03A/04A VPVC-F40-A3-02A/03A/04A VPVC-F40-A4-02A/03A/04A
VP-08-F/A3 VP-12-F/A3 VP-15-F/A3 VP-20-F/A3 VP-30-F/A3 VP-40-F/A3 VP-20-20-FA3 VP-40-40FA3 VUP-16 VP20-FA3 VP20-FA3 VP20-FA3 VP20-FA3 VP08-FA3 VP15-FA3 VP15-FA3 VP12-FA3 VP12-FA3 VP30-FA3 VP40-FA3 VP30-FA3 VP40-FA3 VP20-20-FA3 VP30-30-FA3 VP40-40-FA3 VP15-FA3 VP15-FA3 VUP-16 VP-30+PA VP-40+PA VP45-FA3 VP12-FA3 VP12-FA3 HVP-30 14MPA HVP-40 14MPA
DSG-01-2B2-D24-N1-50 DSG-01-2B2-A120-N1-50 DSG-01-2B2-A240-N1-50 DSG-01-2B2L-D24-N1-50 DSG-01-2B2B-D24-N1-50 DSG-01-2B2A-...-N1-50 DSG-01-2B3-...-N1-50 DSG-01-2B3B-...-N1-50 DSG-01-2B3A-...-N1-50 DSG-01-2B4B-...-N1-50 DSG-01-2B60B-...-N1-50 DSG-01-2B8-...-N1-50 DSG-01-2B10B-...-N1-50 DSG-01-2B11B-...-N1-50 DSG-01-2B2-D24-50 DSG-01-2B2-A120-50 DSG-01-2B2-A240-50 DSG-01-2B2L-...-50 DSG-01-2B2B-...-50 DSG-01-2B2A-...-50 DSG-01-2B3-...-50 DSG-01-2B3B-...-50 DSG-01-2B3A-...-50 DSG-01-2B4B-...-50 DSG-01-2B60B-...-50 DSG-01-2B8-...-50 DSG-01-2B10B-...-50 DSG-01-2B11B-...-50 DSG-01-3C2-D24-N1-50 DSG-01-3C2-A120-N1-50 DSG-01-3C2-A240-N1-50 DSG-01-3C4-D24-N1-50 DSG-01-3C4-A120-N1-50 DSG-01-3C4-A240-N1-50 DSG-01-3C60-D24-N1-50 DSG-01-3C60-A120-N1-50 DSG-01-3C60-A240-N1-50 DSG-01-2D2-D24-N1-50 DSG-01-2D2-A120-N1-50 DSG-01-2D2-A240-N1-50 DSG-01-2N2-...-N1-50 DSG-01-3C9-...-N1-50 DSG-01-3C10-...-N1-50 DSG-01-3C11-...-N1-50 DSG-01-3C12-...-N1-50 DSG-01-3C2-D24-50 DSG-01-3C2-A120-50 DSG-01-3C2-A240-50 DSG-01-3C4-D24-50 DSG-01-3C4-A120-50 DSG-01-3C4-A240-50 DSG-01-3C60-D24-50 DSG-01-3C60-A120-50 DSG-01-3C60-A240-50 DSG-01-2D2-D24-50 DSG-01-2D2-A120-50 DSG-01-2D2-A240-50 DSG-01-2N2-...-50 DSG-01-3C9-...-50 DSG-01-3C10-...-50 DSG-01-3C11-...-50 DSG-01-3C12-...-50 DSG-02-2B2-DL (DC24V) DSG-02-2B2-DL (AC220V) DSG-02-3C2-DL (DC24V) DSG-02-3C2-DL (AC220V) DSG-02-3C3-DL (DC24V) DSG-02-3C3-DL (AC220V) DSG-02-3C4-DL (DC24V) DSG-02-3C4-DL (AC220V) DSG-02-3C6-DL (DC24V) DSG-02-3C6-DL (AC220V) DSG-02-2B2-LW (DC24V) DSG-02-2B2-LW (AC220V) DSG-02-3C2-LW (DC24V)) DSG-02-3C2-LW (AC220V) DSG-02-3C3-LW (DC24V)) DSG-02-3C3-LW (AC220V) DSG-02-3C4-LW (DC24V) DSG-02-3C4-LW (AC220V) DSG-02-3C6-LW (DC24V) DSG-02-3C6-LW (AC220V)
SQP2 SQP2-21-1B-18 SQP2-15-1C-18 SQP1-2-1A/B/C/D-18 SQP1-3-1A/B/C/D-18 SQP1-4-1A/B/C/D-18 SQP1-5-1A/B/C/D-18 SQP1-6-1A/B/C/D-18 SQP1-7-1A/B/C/D-18 SQP1-8-1A/B/C/D-18 SQP1-10-1A/B/C/D-18 SQP1-11-1A/B/C/D-18 SQP1-12-1A/B/C/D-18 SQP1-14-1A/B/C/D-18 SQP2-10-(1A 1B 1C 1D)-18 SQP2-12-(1A 1B 1C 1D)-18 SQP2-14-(1A 1B 1C 1D)-18 SQP2-15-(1A 1B 1C 1D)-18 SQP2-17-(1A 1B 1C 1D)-18 SQP2-19-(1A 1B 1C 1D)-18 SQP2-21-(1A 1B 1C 1D)-18 SQP2-25-(1A 1B 1C 1D)-18
PV2R1-6-F-R PV2R1-8-F-R PV2R1-10-F-R PV2R1-12-F-R PV2R1-14-F-R PV2R1-17-F-R PV2R1-19-F-R PV2R1-21-F-R PV2R1-23-F-R PV2R1-25-F-R PV2R1-28-F-R PV2R1-31-F-R PV2R1-33-F-R PV2R2-23 PV2R2-26 PV2R2-33 PV2R2-41 PV2R2-47 PV2R2-53 PV2R2-59 PV2R2-65
PV2R2-75 PV2R2-31 PV2R1-4RAF1 PV2R1-6RAF1 PV2R1-8RAF1 PV2R1-10RAF1 PV2R1-12RAF1 PV2R1-14RAF1 PV2R1-17RAF1 PV2R1-19RAF1 PV2R1-23RAF1 PV2R1-25RAF1 PV2R1-28RAF1 PV2R1-31RAF1
PV2R1-6-FR PV2R1-8-FR PV2R1-10-FR PV2R1-12-FR PV2R1-14-FR PV2R1-17-FR PV2R1-19-FR PV2R1-21-FR PV2R1-23-FR PV2R1-25-FR PV2R1-28-FR PV2R1-31-FR PV2R1-4-FR
PV2R1-6 PV2R1-8 PV2R1-10 PV2R1-12 PV2R1-14 PV2R1-17 PV2R1-19 PV2R1-23 PV2R1-25 PV2R1-28 PV2R1-31
PV2R24-41-136-F-REAA-41 PV2R24-47-184-F-REAA-41 PV2R24-53-184-F-REAA-41 PV2R24-59-153-F-REAA-41 PV2R24-65-237-F-REAA-41 PV2R24-75-200-F-REAA-41 PV2R24-47-153-F-REAA-41 PV2R24-65-200-F-REAA-41 PV2R24-53-136-F-REAA-41
PV2R34-76-153-F-REAA-41 PV2R34-85-184-F-REAA-41 PV2R34-94-136-F-REAA-41 PV2R34-108-184-F-REAA-41 PV2R34-116-200-F-REAA-41 PV2R34-125-237-F-REAA-41 PV2R34-76-136-F-REAA-41 PV2R34-94-184-F-REAA-41 PV2R34-85-200-F-REAA-41
PV2R12-25-33 PV2R12-25-41 PV2R12-25-47 PV2R12-25-53 PV2R12-25-59 PV2R12-25-65 PV2R12-25-75 PV2R12-28-33 PV2R12-28-41 PV2R12-28-47 PV2R12-28-53 PV2R12-28-59 PV2R12-28-65 PV2R12-28-75 PV2R12-31-59
PV2R2-26-F-RAA-41 PV2R2-33-F-RAA-41 PV2R2-41-F-RAA-41 PV2R2-47-F-RAA-41 PV2R2-53-F-RAA-41 PV2R2-59-F-RAA-41 PV2R2-65-F-RAA-41 PV2R2-75-F-RAA-41 S-PV2R2-26 S-PV2R2-33 S-PV2R2-41 S-PV2R2-47 S-PV2R2-53 S-PV2R2-59 S-PV2R2-65 S-PV2R2-75 PV2R2-41-F1 PV2R2-33-F1
PVL2-26 PVL2-33 PVL2-41 PVL2-47 PVL2-53 PVL2-59 PVL2-65 PVL2-75 PV2R2-26 PV2R2-33 PV2R2-41 PV2R2-47 PV2R2-53 PV2R2-59 PV2R2-65 PV2R2-75
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