CN102155445B - Hydraulic control system with double-feedback active proportional servo cartridge valve for CNC (Computer Numerical Control) bending machine - Google Patents
Hydraulic control system with double-feedback active proportional servo cartridge valve for CNC (Computer Numerical Control) bending machine Download PDFInfo
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- CN102155445B CN102155445B CN 201110046561 CN201110046561A CN102155445B CN 102155445 B CN102155445 B CN 102155445B CN 201110046561 CN201110046561 CN 201110046561 CN 201110046561 A CN201110046561 A CN 201110046561A CN 102155445 B CN102155445 B CN 102155445B
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Abstract
The invention relates to a hydraulic control system with a double-feedback active proportional servo cartridge valve for a CNC (Computer Numerical Control) bending machine, in particular to hydraulic control system equipment with the double-feedback active proportional servo cartridge valve for the CNC bending machine, wherein the hydraulic control system is synchronized actively and has adjustable speed servo. The hydraulic control system consists of two main cylinder control valve banks, an oil inlet control valve bank and a workbench compensating oil cylinder, wherein the two main cylinder control valve banks are arranged separately; two double-active servo cartridge valve units, a safety control unit and a pressure regulating unit are arranged in each valve bank; the two main cylinder control valve banks are used for driving corresponding main cylinders respectively to ensure the synchronous position accuracy of each main cylinder; and the oil inlet control valve bank is used for controlling the inlet and outlet of oil and the proportional regulation of the system pressure and supplying pilot control oil to the double-active servo cartridge valve. The hydraulic control system has the advantages of simple structure, accuracy and simplicity and convenience for operation control due to the adoption of the cartridge valve, stability and reliability for work, no leakage, high efficiency, reduced energy consumption, reduced equipment manufacturing cost and high integration degree, and is widely applied to the hydraulic control equipment of the CNC bending machine.
Description
Technical field
The present invention relates to the active proportional servo cartridge valve numerical control bender hydraulic control system of a kind of two feedbacks, particularly have active synchronization, the active proportional servo cartridge valve numerical control bender hydraulic control system equipment of two feedbacks that speed servo is adjustable.
Background technique
At present, numerical control bender is mainly used in sheetmetal working, can reduce operation easier according to angle automatic computing engine tool position, increases work efficiency.The main sliding valve style hydraulic control system equipment that adopts the development fifties in the numerical control bender system, its guiding valve hydraulic control system performance parameter is low, when running into bigger offset loading force in the bender working stroke, can produce bigger unbalance loading moment to equipment, can not guarantee the displacement accuracy of oil cylinder, main frame mechanism is deformed, cause the bender precision low, while control section complex structure, rate of fault height, leak serious, action is unstable, impacts greatly, descends speed unadjustable soon, it is bigger to take up room, and maintenance is inconvenient.
Summary of the invention
Purpose of the present invention provides the active proportional servo cartridge valve numerical control bender hydraulic control system of a kind of two feedbacks, and it is to adopt cartridge valve to combine with the integrated hydraulic control system, the control system of control numerical control bender, it is low to solve the bender precision, complex structure, rate of fault height, leak serious, action is unstable, impacts greatly, descends speed unadjustable soon, it is bigger to take up room, the problem that maintenance is inconvenient.
The active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention takes following technological scheme to realize: it is to be made of two master cylinder control valve groups, an oil-feed control valve group and a worktable compensating cylinder, two master cylinder control valve groups arrange separately, two master cylinder control valve block structures are identical, be provided with two two initiatively servo cartridge valve unit and security control unit and pressure regulation unit in each valve group, drive corresponding master cylinder respectively, guarantee the sync bit precision of each master cylinder; The turnover of oil-feed control valve group control fluid and the ratio of system pressure are regulated and are provided two initiatively guides of servo cartridge valve to control oil; The worktable that the worktable compensating cylinder is used for before the bending is regulated, by pump, the two-position four-way solenoid directional control valve, proportional servo valve, Solenoid ball valve, direct-acting overflow valve, cartridge valve, two aggressive valve, electromagnetic relief valve, one-way valve, reduction valve, proportional pressure control valve, accumulator becomes with the control valve fabric, the active proportional servo cartridge valve of two feedbacks numerical control bender hydraulic control system is the number one pump, No. three pump, the oil outlet of No. four pump is connected with oil-feed control valve group, No. second pump connects the filler opening of high pressure filter, the oil outlet of high pressure filter is connected with oil-feed control valve group, the filler opening of electromagnetic relief valve is communicated with high pressure filter, the oil outlet of electromagnetic relief valve is communicated with oiling valve group return opening, the filler opening of No. second one-way valve is communicated with the oil outlet of high pressure filter, the oil outlet of No. second one-way valve is communicated with the filler opening of reduction valve, the oil outlet of reduction valve is communicated with the filler opening of No. three two-position four-way solenoid valve, the working hole of No. three two-position four-way solenoid valve is by liquid-filling valve control mouth and number one liquid-filling valve, No. second liquid-filling valve is communicated with, the oil outlet of No. three two-position four-way solenoid valve is communicated with oiling valve group return opening, the filler opening of direct-acting overflow valve is communicated with No. second one-way valve, the oil outlet of direct-acting overflow valve is communicated with oiling valve group return opening, accumulator is communicated with No. second one-way valve, accumulator by the number one flange mouth respectively with No. second master cylinder control valve group on the proportional servo valve filler opening and the proportional servo valve filler opening on the number one master cylinder control valve group be communicated with, the filler opening of number one one-way valve is communicated with the oil outlet of number one pump, the oil outlet of number one one-way valve is communicated with the filler opening of No. second plug-in mounting pressure valve, the filler opening of No. three one-way valve is communicated with the oil outlet of No. four pump, the oil outlet of No. three one-way valve is communicated with the filler opening of No. second plug-in mounting pressure valve, the filler opening of No. four one-way valve is communicated with the oil outlet of No. three pump, the oil outlet of No. four one-way valve is communicated with the filler opening of No. second plug-in mounting pressure valve, the oil outlet of No. second plug-in mounting pressure valve is communicated with oiling valve group return opening, the filler opening of proportional pressure control valve is communicated with the oil outlet of No. second plug-in mounting pressure valve and No. four one-way valve, the oil outlet of proportional pressure control valve is communicated with oiling valve group return opening, the filler opening of No. second plug-in mounting pressure valve is communicated with number one master cylinder control valve group and No. second master cylinder control valve group by No. second flange mouth, the filler opening of No. second plug-in mounting pressure valve is communicated with the filler opening of threeway proportional pressure-reducing valve by No. three flange mouth, and the working hole of threeway proportional pressure-reducing valve is connected with the worktable compensating cylinder; Master cylinder control valve group filler opening is communicated with No. second flange mouth, master cylinder control valve group filler opening is communicated with the filler opening of No. second two aggressive valve, the oil outlet of No. second two aggressive valve is communicated with the plug chamber of No. second liquid-filling valve and No. second master cylinder, the control mouth of No. second two aggressive valve is communicated with No. second proportional servo valve, No. second proportional servo valve is communicated with proportional servo valve filler opening and proportional servo valve return opening, the filler opening of No. second cartridge valve is communicated with master cylinder control valve group filler opening, the oil outlet of No. second cartridge valve is communicated with the filler opening of number one plug-in mounting pressure valve and the filler opening of number one cartridge valve and the two aggressive valve of number one, the control mouth of No. second cartridge valve is communicated with the working hole of No. second two-position four-way solenoid valve, the filler opening of No. second cartridge valve is communicated with the filler opening of No. second two-position four-way solenoid valve, the oil outlet of No. second two-position four-way solenoid valve is communicated with main valve group return opening, the control mouth of number one cartridge valve is communicated with the Solenoid ball valve working hole, the filler opening of number one cartridge valve is communicated with the filler opening of Solenoid ball valve, the oil outlet of Solenoid ball valve is communicated with main valve group return opening, the filler opening of number one two-position four-way solenoid valve is communicated with the control mouth of number one plug-in mounting pressure valve, the oil outlet of number one two-position four-way solenoid valve is communicated with the oil outlet of number one plug-in mounting pressure valve, the oil outlet of number one plug-in mounting pressure valve is communicated with main valve group return opening, the oil outlet of the two aggressive valve of number one is communicated with main valve group return opening, the control mouth of the two aggressive valve of number one is communicated with the working hole of number one proportional servo valve, the filler opening of number one proportional servo valve is communicated with the proportional servo valve filler opening, the oil outlet of number one proportional servo valve is communicated with the proportional servo valve return opening, the oil outlet of number one cartridge valve is communicated with the bar chamber of master cylinder, the filler opening of safety valve is communicated with the bar chamber of master cylinder, the oil outlet of safety valve is communicated with main valve group return opening, and the grating chi is installed in the master cylinder side.
The effect of the active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention is simple in structure, adopt cartridge valve, the external form volume is little, operation control is accurately easy, and working stability is reliable, does not have and reveals, have high efficiency and energy efficient, reduce equipment manufacturing cost, the level of integration height is widely used on the numerical control bender machine hydraulic-pressure control apparatus.
Description of drawings
The active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention will describe in further detail by reference to the accompanying drawings.
Fig. 1 is the hydraulic structure schematic representation of the active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention.
Fig. 2 is the hydraulic structure schematic representation of master cylinder control valve group of the present invention.
Fig. 3 is the hydraulic structure schematic representation of oiling valve group of the present invention.
1-number one pump, 2-No. the second pump, 3-oil-feed control valve group, 4-number one master cylinder control valve group, 5-number one grating scale, 6-number one master cylinder, 7-number one prefill valve, 8-No. the second prefill valve, 9-No. the second master cylinder, 10-No. the second grating scale, 11-No. the second master cylinder control valve group, 12-threeway proportional pressure-reducing valve, 13-workbench compensating cylinder, 14-the No. three pump, 15-the No. four pump, 16-number one two-position four-way solenoid valve, 17-main valve group oil return opening, 18-proportional servo valve oil return opening, 19-proportional servo valve oil-in, 20-number one proportional servo valve, the two aggressive valve of 21-number one, 22-safety valve, 23-number one inserted valve, 24-Solenoid ball valve, 25-No. the second two-position four-way solenoid valve, 26-No. the second inserted valve, 27-No. the second two aggressive valve, 28-No. the second proportional servo valve, 29-master cylinder control valve group oil-in, 30-number one plug-in mounting pressure valve, 31-high pressure filter, 32-electromagnetic relief valve, 33-number one check valve, 34-No. the second check valve, 35-pressure-reducing valve, 36-the No. three two-position four-way solenoid valve, 37-prefill valve is controlled mouth, 38-accumulator, 39-number one flange port, 40-direct-acting overflow valve, 41-No. the second flange port, 42-the No. three flange port, 43-No. the second plug-in mounting pressure valve, 44-proportional pressure control valve, 45-the No. three check valve, 46-the No. four check valve, 47-inlet valve group oil return opening.
Embodiment:
With reference to Fig. 1,2,3, the active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention, it is to be made of two master cylinder control valve groups, an oil-feed control valve group and a worktable compensating cylinder 13, two master cylinder control valve groups arrange separately, two master cylinder control valve block structures are identical, be provided with two two initiatively servo cartridge valve unit and security control unit and pressure regulation unit in each valve group, drive corresponding master cylinder respectively, guarantee the sync bit precision of each master cylinder; The turnover of oil-feed control valve group control fluid and the ratio of system pressure are regulated and are provided two initiatively guides of servo cartridge valve to control oil; The worktable that worktable compensating cylinder 13 is used for before the bending is regulated; By pump, the two-position four-way solenoid directional control valve, proportional servo valve, Solenoid ball valve, direct-acting overflow valve, cartridge valve, two aggressive valve, electromagnetic relief valve, one-way valve, reduction valve, proportional pressure control valve, accumulator becomes with the control valve fabric, the active proportional servo cartridge valve of two feedbacks numerical control bender hydraulic control system is number one pump 1, No. three pump 14, the oil outlet of No. four pump 15 is connected with oil-feed control valve group 3, No. second pump 2 connects the filler opening of high pressure filter 31, the oil outlet of high pressure filter 31 is connected with oil-feed control valve group 3, the filler opening of electromagnetic relief valve 32 is communicated with high pressure filter 31, the oil outlet of electromagnetic relief valve 32 is communicated with oiling valve group return opening 47, the filler opening of No. second one-way valve 34 is communicated with the oil outlet of high pressure filter 31, the oil outlet of No. second one-way valve 34 is communicated with the filler opening of reduction valve 35, the oil outlet of reduction valve 35 is communicated with the filler opening of No. three two-position four-way solenoid valve 36, the working hole of No. three two-position four-way solenoid valve 36 is by liquid-filling valve control mouth 37 and number one liquid-filling valve 7, No. second liquid-filling valve 8 is communicated with, the oil outlet of No. three two-position four-way solenoid valve 36 is communicated with oiling valve group return opening 47, the filler opening of direct-acting overflow valve 40 is communicated with No. second one-way valve 34, the oil outlet of direct-acting overflow valve 40 is communicated with oiling valve group return opening 47, accumulator 38 is communicated with No. second one-way valve 34, accumulator 38 by number one flange mouth 39 respectively with No. second master cylinder control valve group 11 on proportional servo valve filler opening 19 and the proportional servo valve filler opening on the number one master cylinder control valve group 4 be communicated with, the filler opening of number one one-way valve 33 is communicated with the oil outlet of number one pump 1, the oil outlet of number one one-way valve 33 is communicated with the filler opening of No. second plug-in mounting pressure valve 43, the filler opening of No. three one-way valve 45 is communicated with the oil outlet of No. four pump 15, the oil outlet of No. three one-way valve 45 is communicated with the filler opening of No. second plug-in mounting pressure valve 43, the filler opening of No. four one-way valve 46 is communicated with the oil outlet of No. three pump 14, the oil outlet of No. four one-way valve 46 is communicated with the filler opening of No. second plug-in mounting pressure valve 43, the oil outlet of No. second plug-in mounting pressure valve 43 is communicated with oiling valve group return opening 47, the filler opening of proportional pressure control valve 44 is communicated with the oil outlet of No. second plug-in mounting pressure valve 43 and No. four one-way valve 46, the oil outlet of proportional pressure control valve 44 is communicated with oiling valve group return opening 47, the filler opening of No. second plug-in mounting pressure valve 43 is communicated with number one master cylinder control valve group 4 and No. second master cylinder control valve group 11 by No. second flange mouth 41, the filler opening of No. second plug-in mounting pressure valve 43 is communicated with the filler opening of threeway proportional pressure-reducing valve 12 by No. three flange mouth 42, and the working hole of threeway proportional pressure-reducing valve 12 is connected with worktable compensating cylinder 13; Master cylinder control valve group filler opening 29 is communicated with No. second flange mouth 41, master cylinder control valve group filler opening 29 is communicated with the filler opening of No. second two aggressive valve 27, the oil outlet of No. second two aggressive valve 27 is communicated with the plug chamber of No. second liquid-filling valve 8 and No. second master cylinder 9, the control mouth of No. second two aggressive valve 27 is communicated with No. second proportional servo valve 28, No. second proportional servo valve 28 is communicated with proportional servo valve filler opening 19 and proportional servo valve return opening 18, the filler opening of No. second cartridge valve 26 is communicated with master cylinder control valve group filler opening 29, the oil outlet of No. second cartridge valve 26 is communicated with the filler opening of number one plug-in mounting pressure valve 30 and the filler opening of number one cartridge valve 23 and the two aggressive valve 21 of number one, the control mouth of No. second cartridge valve 26 is communicated with the working hole of No. second two-position four-way solenoid valve 25, the filler opening of No. second cartridge valve 26 is communicated with the filler opening of No. second two-position four-way solenoid valve 25, the oil outlet of No. second two-position four-way solenoid valve 25 is communicated with main valve group return opening 17, the control mouth of number one cartridge valve 23 is communicated with Solenoid ball valve 24 working holes, the filler opening of number one cartridge valve 23 is communicated with the filler opening of Solenoid ball valve 24, the oil outlet of Solenoid ball valve 24 is communicated with main valve group return opening 17, the filler opening of number one two-position four-way solenoid valve 16 is communicated with the control mouth of number one plug-in mounting pressure valve 30, the oil outlet of number one two-position four-way solenoid valve 16 is communicated with the oil outlet of number one plug-in mounting pressure valve 30, the oil outlet of number one plug-in mounting pressure valve 30 is communicated with main valve group return opening 17, the oil outlet of the two aggressive valve 21 of number one is communicated with main valve group return opening 17, the control mouth of the two aggressive valve 21 of number one is communicated with the working hole of number one proportional servo valve 20, the filler opening of number one proportional servo valve 20 is communicated with proportional servo valve filler opening 19, the oil outlet of number one proportional servo valve 20 is communicated with proportional servo valve return opening 18, the oil outlet of number one cartridge valve 23 is communicated with the bar chamber of No. second master cylinder 9, the filler opening of safety valve 22 is communicated with the bar chamber of second master cylinder 9, the oil outlet of safety valve 22 is communicated with main valve group return opening 17, number one grating chi 5 is installed in the side of number one master cylinder 6, and No. second grating chi 10 is installed in the side of No. second master cylinder 9.
The embodiment of the active proportional servo cartridge valve numerical control bender hydraulic control system of the two feedbacks of the present invention, it is to be made of two master cylinder control valve groups, an oil-feed control valve group and a worktable compensating cylinder 13, two master cylinder control valve groups arrange separately, two master cylinder control valve block structures are identical, be provided with two two initiatively servo cartridge valve unit and security control unit and pressure regulation unit in each valve group, drive corresponding master cylinder respectively, guarantee the sync bit precision of each master cylinder; The turnover of oil-feed control valve group control fluid and the ratio of system pressure are regulated and are provided two initiatively guides of servo cartridge valve to control oil; The worktable that worktable compensating cylinder 13 is used for before the bending is regulated; Become by pump, two-position four-way solenoid directional control valve, proportional servo valve, Solenoid ball valve, direct-acting overflow valve, cartridge valve, two aggressive valve, electromagnetic relief valve, one-way valve, reduction valve, proportional pressure control valve, accumulator and control valve fabric, realize bender fast down, the workflow of compacting, release, four operations of backhaul is as follows:
Fast operation down, number one pump 1, No. second pump 2, No. three pump 14, after No. four pump 15 is opened, electromagnet YV1, YV5, the YV8 energising, give proportion electro-magnet Y1 according to rate request, Y3, Y4, Y5, the corresponding scaling signal of Y6, electromagnetic relief valve 32 cuts out, No. second plug-in mounting pressure valve 43 is closed, this moment, the system pressure valve was high pressure, make that system pressure oil can not oil return, system pressure oil is by number one one-way valve 33, No. three one-way valve 45, No. four one-way valve 46 enters number one master cylinder 6 with two aggressive valve, the plug chamber of No. second master cylinder 9, part oil enters accumulator 38 by No. second one-way valve 34 simultaneously, fluid by the topping up case through number one liquid-filling valve 7, No. second liquid-filling valve 8 enters number one master cylinder 6, No. second master cylinder 9, moved cross beam descends fast, can be by regulating proportion electro-magnet Y3, Y4, Y5, speed under the corresponding scaling signal size of Y6 changes soon.
Suppression process, when moved cross beam during soon near workpiece, electromagnet YV1, YV5, the YV8 energising, give proportion electro-magnet Y1 according to rate request, Y3, Y4, Y5, the corresponding scaling signal of Y6, this moment proportion electro-magnet Y4, the signal of Y6 reduces, the opening of corresponding proportional servo valve reduces, downstream rate is slack-off, system changes the worker into and advances, No. second master cylinder 9 begins pressurization, when the position of the position of No. second master cylinder 9 and No. second grating chi 10 and number one master cylinder 6 and number one grating chi 5 during not at same horizontal position, and the signal magnitude of change proportion electro-magnet Y6 after the grating chi feedback signal, the opening amount of corresponding proportional servo valve changes, make the displacement of No. second master cylinder 9 tracking number one master cylinders 6, the motion of two oil cylinders is kept synchronously, behind contact workpiece, system boosts, and realizes suppression process.
The release operation, be after compacting is finished, electromagnet YV1, YV2 energising, reduce the signal of proportion electro-magnet Y1, this moment, the system pressure valve was low pressure, system pressure oil enters liquid-filling valve control mouth by No. three two-position four-way solenoid valve 36, and number one liquid-filling valve 7, No. second liquid-filling valve 8 are realized pre-pressure release power.
The backhaul operation, electromagnet YV1, YV4, YV7 energising, this moment, the system pressure valve was high pressure, make that system pressure oil can not oil return, system pressure oil enters the bar chamber of number one master cylinder 6, No. second master cylinder 9 by number one one-way valve 33, No. three one-way valve 45, No. four one-way valve 46 and cartridge valve, the fluid in number one master cylinder 6, No. second master cylinder 9 plug chambeies is got back to the topping up case by number one liquid-filling valve 7, No. second liquid-filling valve 8, realizes returning operation.
When needing to adjust worktable, give the corresponding scaling signal of proportion electro-magnet Y2 as requested, threeway proportional pressure-reducing valve 12 just by corresponding flow, moves worktable compensating cylinder 13.
Claims (1)
1. one kind pair is fed back active proportional servo cartridge valve numerical control bender hydraulic control system, it is by two master cylinder control valve groups, oil-feed control valve group and a worktable compensating cylinder (13) constitute, it is characterized in that two master cylinder control valve groups arrange separately, two master cylinder control valve block structures are identical, be provided with two two initiatively servo cartridge valve unit and security control unit and pressure regulation unit in each valve group, drive corresponding master cylinder respectively, the active proportional servo cartridge valve of two feedbacks numerical control bender hydraulic control system is number one pump (1), No. three pump (14), the oil outlet of No. four pump (15) is connected with oil-feed control valve group (3), No. second pump (2) connects the filler opening of high pressure filter (31), the oil outlet of high pressure filter (31) is connected with oil-feed control valve group (3), the filler opening of electromagnetic relief valve (32) is communicated with high pressure filter (31), the oil outlet of electromagnetic relief valve (32) is communicated with oiling valve group return opening (47), the filler opening of No. second one-way valve (34) is communicated with the oil outlet of high pressure filter (31), the oil outlet of No. second one-way valve (34) is communicated with the filler opening of reduction valve (35), the oil outlet of reduction valve (35) is communicated with the filler opening of No. three two-position four-way solenoid valve (36), the working hole of No. three two-position four-way solenoid valve (36) is by liquid-filling valve control mouthful (37) and number one liquid-filling valve (7), No. second liquid-filling valve (8) is communicated with, the oil outlet of No. three two-position four-way solenoid valve (36) is communicated with oiling valve group return opening (47), the filler opening of direct-acting overflow valve (40) is communicated with No. second one-way valve (34), the oil outlet of direct-acting overflow valve (40) is communicated with oiling valve group return opening (47), accumulator (38) is communicated with No. second one-way valve (34), accumulator (38) by number one flange mouth (39) respectively with No. second master cylinder control valve group (11) on proportional servo valve filler opening (19) and the proportional servo valve filler opening on the number one master cylinder control valve group (4) be communicated with, the filler opening of number one one-way valve (33) is communicated with the oil outlet of number one pump (1), the oil outlet of number one one-way valve (33) is communicated with the filler opening of No. second plug-in mounting pressure valve (43), the filler opening of No. three one-way valve (45) is communicated with the oil outlet of No. four pump (15), the oil outlet of No. three one-way valve (45) is communicated with the filler opening of No. second plug-in mounting pressure valve (43), the filler opening of No. four one-way valve (46) is communicated with the oil outlet of No. three pump (14), the oil outlet of No. four one-way valve (46) is communicated with the filler opening of No. second plug-in mounting pressure valve (43), the oil outlet of No. second plug-in mounting pressure valve (43) is communicated with oiling valve group return opening (47), the filler opening of proportional pressure control valve (44) is communicated with the oil outlet of No. second plug-in mounting pressure valve (43) and No. four one-way valve (46), the oil outlet of proportional pressure control valve (44) is communicated with oiling valve group return opening (47), the filler opening of No. second plug-in mounting pressure valve (43) is communicated with number one master cylinder control valve group (4) and No. second master cylinder control valve group (11) by No. second flange mouth (41), the filler opening of No. second plug-in mounting pressure valve (43) is communicated with the filler opening of threeway proportional pressure-reducing valve (12) by No. three flange mouth (42), and the working hole of threeway proportional pressure-reducing valve (12) is connected with worktable compensating cylinder (13); Master cylinder control valve group filler opening (29) is communicated with No. second flange mouth (41), master cylinder control valve group filler opening (29) is communicated with the filler opening of No. second two aggressive valve (27), the oil outlet of No. second two aggressive valve (27) is communicated with the plug chamber of No. second liquid-filling valve (8) and No. second master cylinder (9), the control mouth of No. second two aggressive valve (27) is communicated with No. second proportional servo valve (28), No. second proportional servo valve (28) is communicated with proportional servo valve filler opening (19) and proportional servo valve return opening (18), the filler opening of No. second cartridge valve (26) is communicated with master cylinder control valve group filler opening (29), the oil outlet of No. second cartridge valve (26) is communicated with the filler opening of number one plug-in mounting pressure valve (30) and the filler opening of number one cartridge valve (23) and the two aggressive valve (21) of number one, the control mouth of No. second cartridge valve (26) is communicated with the working hole of No. second two-position four-way solenoid valve (25), the filler opening of No. second cartridge valve (26) is communicated with the filler opening of No. second two-position four-way solenoid valve (25), the oil outlet of No. second two-position four-way solenoid valve (25) is communicated with main valve group return opening (17), the control mouth of number one cartridge valve (23) is communicated with Solenoid ball valve (24) working hole, the filler opening of number one cartridge valve (23) is communicated with the filler opening of Solenoid ball valve (24), the oil outlet of Solenoid ball valve (24) is communicated with main valve group return opening (17), the filler opening of number one two-position four-way solenoid valve (16) is communicated with the control mouth of number one plug-in mounting pressure valve (30), the oil outlet of number one two-position four-way solenoid valve (16) is communicated with the oil outlet of number one plug-in mounting pressure valve (30), the oil outlet of number one plug-in mounting pressure valve (30) is communicated with main valve group return opening (17), the oil outlet of the two aggressive valve (21) of number one is communicated with main valve group return opening (17), the control mouth of the two aggressive valve (21) of number one is communicated with the working hole of number one proportional servo valve (20), the filler opening of number one proportional servo valve (20) is communicated with proportional servo valve filler opening (19), the oil outlet of number one proportional servo valve (20) is communicated with proportional servo valve return opening (18), the oil outlet of number one cartridge valve (23) is communicated with the bar chamber of No. second master cylinder (9), the filler opening of safety valve (22) is communicated with the bar chamber of second master cylinder (9), the oil outlet of safety valve (22) is communicated with main valve group return opening (17), number one grating chi (5) is installed in the side of number one master cylinder (6), and No. second grating chi (10) is installed in the side of No. second master cylinder (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110046561 CN102155445B (en) | 2011-02-22 | 2011-02-22 | Hydraulic control system with double-feedback active proportional servo cartridge valve for CNC (Computer Numerical Control) bending machine |
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| CN 201110046561 CN102155445B (en) | 2011-02-22 | 2011-02-22 | Hydraulic control system with double-feedback active proportional servo cartridge valve for CNC (Computer Numerical Control) bending machine |
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| CN102155445A (en) | 2011-08-17 |
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