CN85103339A - Hydraulic governor by direct control - Google Patents
Hydraulic governor by direct control Download PDFInfo
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- CN85103339A CN85103339A CN85103339.3A CN85103339A CN85103339A CN 85103339 A CN85103339 A CN 85103339A CN 85103339 A CN85103339 A CN 85103339A CN 85103339 A CN85103339 A CN 85103339A
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Abstract
Hydraulic governor by direct control.Belong to flow regulation and pressure regulator solution pressing system technical field.System adopts the multistage variable controller of each stroke by the binary number weighting, and by fixed routine or programmable controller, adding up draws the flow changing curve that changes by the binary number magnitude relation.Can directly utilize the microcomputer output signal through the voltage amplification control system, need not the D/A conversion.Comparable existing ratio regulating load sensory system is further energy-conservation 7～10%, and cost is low, easy-maintaining, reliable operation.Can be used for hydraulic speed regulation systems such as plastics machinery, lathe, engineering machinery, ship machinery.With specific embodiment.
Description
The invention belongs to flow regulation and pressure regulator solution pressing system.
In recent years, hydraulic system requires energy-conservation cry very high, and relatively more novel both at home and abroad at present energy conserving system is employing ratio Hydraulic Elements and load sensitive pump.Fig. 1 is existing ratio regulating load sensory system schematic diagram (all belonging to this type of as the clear 58-96187 of day disclosure special permission communique, United States Patent (USP) 4,199,942).Its principle of work is as follows: variable output pump (1), variable piston (2), pressure control valve (3), surplus valve (4) and flowrate control valve (5) have been formed the load-sensitive pumping system.Proportional throttle valve (6) is the flow regulator of system, and solenoid directional control valve (7) is used to control the direction of motion of oil cylinder (8).If desired the movement velocity of load (9) is regulated, for example, make the speed of load (9) be adjusted to 80% full speed from full speed, we can pass through amplifier (10), the aperture of proportional throttle valve is turned down, in this moment, oil pump is also pressed delivery work, make and act on the pressure reduction △ P increase that proportional throttle valve (6) is imported and exported two ends, like this, destroyed the equilibrium condition of flowrate control valve (5), the spool of flowrate control valve (5) is moved right, a part of oil will be by flowrate control valve (5) and pressure control valve (3) in the working connection, entering variable piston (2) reduces oil pump (1) flow, at this moment, flow reduces in the working connection, the result descends the pressure reduction △ P at proportional throttle valve (6) two ends, thereby reaches new equilibrium state, and the spool of flowrate control valve this moment (5) is also got back to meta, and oil pump (1) is worked under 80% delivery operating mode, to satisfy the needs of load (9).
Aforementioned proportion regulating load sensory system, than general fixed displacement pump throttle grverning system conserve energy, if because general Constant Pump System speed governing to 80% at full speed the time, 20% flow will flow back to fuel tank in vain from surplus valve, cause energy loss.Ratio regulating load sensory system, though also be to carry out speed governing by throttling valve, oil pump can be according to required flow variable voluntarily, therefore, the surplus valve place does not have energy loss.; can see from the speed control principle of ratio regulating load sensory system; make its flow adjusted, must keep the pressure reduction △ P at flowrate control valve (5) two ends, this pressure reduction △ P is produced by proportional throttle valve (6) two ends that are connected in the working connection.This pressure reduction will cause energy loss, and just, oil pump feed pressure will equal the required pressure of load oil cylinder (8) and add △ P.According to interrelated data introduction at present, the control pressure reduction △ P=10 of load-sensitive pumping system～15 crust, for the hydraulic systems that are lower than 160 crust of a large amount of employings at present, this is a no small loss, has accounted for 7～10% of general power, is uneconomic.Simultaneously, the speed of ratio regulating load sensory system is regulated, and signal amplifier (10) must be arranged, if adopt microcomputer (12) to control, D/A converter (11) must be arranged also then.Signal amplifier (10) and D/A converter (11) price comparison costliness, therefore the maintenance requirement height, promotes difficulty of system controlled by computer in this system.
The objective of the invention is, should regulate the flow of oil pump easily, do not wish to have the energy loss that causes because of control pressure reduction △ P among Fig. 1 again, when requiring to use system controlled by computer simultaneously, do not need D/A converter, be beneficial to microcomputer and in hydraulic system, apply.Fig. 2 is the hydraulic governor by direct control schematic diagram by the present invention's design.This system is made up of variable output pump (1), reversal valve (7), topworks (98), load (9), surplus valve (4) and variable control device.This variable control device is the direct control device of a kind of scale-of-two, and it comprises variable controller (80), micro-electro-hydraulic switch group (70) and programming controller (99).Variable capacity oil pump ⑴ is controlled by variable controller (80), and variable controller (80) is made up of multi-stage oil cylinder (81), (82), (83), (84), and their stroke is pressed the binary number weighting, and stroke ratio is in this example: L
81: L
82: L
83: L
84=1: 2: 4: 8.Each oil cylinder is controlled by the switching of corresponding micro-electro-hydraulic switch, and micro-electro-hydraulic switch in this example (71), (72), (73), that (74) control multi-stage oil cylinder respectively is at different levels: (81), (82), (83), (84).When supplied with digital signal is 1, then electromagnet energising, this grade oil cylinder piston bar is overhanging, and when input signal is 0, then electromagnet outage is contracted in the oil cylinder piston bar.As long as the binary number signal is arranged, by simple amplifier and contactor, just can control, thereby realize oil pump flow is controlled micro-electro-hydraulic switch group (70).If input signal is 0000, micro-electro-hydraulic switch (71), (72), (73), (74) all cut off the power supply, contract in the oil cylinder piston bar of oil cylinder (81), (82), (83), (84) in the variables corresponding controller (80), this moment, oil pump capacity was almost nil, as the A condition of variable controller among Fig. 2 (80).If input signal is 1111, micro-electro-hydraulic switch (71), (72), (73), (74) all switch on, the piston rod of oil cylinder (81), (82), (83), (84) is overhanging in the variables corresponding controller (80), this moment, oil pump capacity was delivery Q, as the B state of variable controller among Fig. 2 (80).If the signal of input is 0001, at this moment, has only micro-electro-hydraulic switch (71) energising, (81) oil cylinder piston bar in the variables corresponding controller (80) is overhanging, this moment, oil pump capacity was 1/15 Q, if input signal is 0010, have only (82) oil cylinder piston bar overhanging, this moment, oil pump capacity was 2/15 Q, if input signal is 0101, then micro-electro-hydraulic switch (71), (73) energising, (81) in the variables corresponding controller, (83) oil cylinder piston bar are overhanging, and this moment, the oil pump feed amount was 5/15 Q.If the requirement in the example during by discussion ratio regulating load sensory system, making the oil pump delivery rate is i.e. 12/15 Q of 80%Q, can get input signal is 1100, at this moment, micro-electro-hydraulic switch (73), (74) energising, (83), (84) oil cylinder piston bar are overhanging accordingly, and this moment, oil pump capacity was that 12/15 Q is 80%Q.Therefore, carry out variable controller multi-stage oil cylinder design, get in this example under the situation of 4 grades of oil cylinders,, can obtain from being bordering on zero discharge capacity up to 16 kinds of oil pumps of delivery by different micro-electro-hydraulic switch power on/off situations by binary number.Fig. 3 has represented the relation of each micro-electro-hydraulic switch power on/off situation and oil pump capacity in this example.Abscissa is represented microswitch energising situation, and ordinate is represented oil pump capacity.If variable controller (80) is made up of 5 stages of digital oil cylinders, can obtain the discharge capacity controlled stage of 32 oil pumps, if variable controller is made up of n stages of digital oil cylinder, and be furnished with n micro-electro-hydraulic switch, can obtain 2 so
nThe discharge capacity controlled stage of individual oil pump.
The present invention is with the difference of ratio regulating load sensory system shown in Figure 1: the outlet oil pressure by oil pump in the designed system of the present invention (Fig. 2) equals load pressure, there is not the pressure reduction △ P that throttling valve produces in the working connection, therefore, to identical operating mode, if adopt the present invention, will be than ratio regulating load sensory system shown in Figure 1 further energy-conservation 7～10%.
Programming controller (99) can be made of or the fixed routine controller constitutes travel switch and relay, also the programmable controller that can be made up of microcomputer and interface element and voltage amplifier etc.
Can know by top introduction, control signal is with binary mode, just can directly control through voltage amplification (as microcomputer output voltage signal 5V is amplified to 24V) micro-electro-hydraulic switch, just controlled oil pump flow, therefore, do not need D/A converter, just can same microcomputer.Like this, system controlled by computer facilitates in this hydraulic system and applies.If programmable controller (99) with single card microcomputer and voltage amplifier composition, itself can have the keyboard input, can have nixie tube and diode displaying, output partly is furnished with as 24V, the relay signal output of 3A power, like this, Hydraulic Elements are still regular size, export by scale-of-two, just can carry out automated procedures control to relevant hydraulic system, replace general relay control system and circuit, can receive to reduce production costs, improve the economic benefit of operating accuracy and production efficiency.
If the pressure spring handle of surplus valve ⑷ among Fig. 2, by controlling as the multistage digital oil cylinder of variable controller (80) analog structure, then the control of oil pressure can be carried out scale-of-two and directly control, and carry out system controlled by computer easily also as the flow control form in the system.
Fig. 4 is the programmable controller schematic diagram, it can be made of (also can control with a microcomputer serial) four microcomputers, by the next command signal of central processing unit (CPU) (34), take out binary signal through read-write memory (RAM) (35), amplify on the micro-electro-hydraulic switch (71) received respectively by lead (44), (45), (46), (47) among Fig. 2, (72), (73), (74) through voltage amplifier (36), just can control oil pump, make system obtain different flows.
The present invention can be used as the various machinery hydraulic systems that need speed governing, pressure regulation, as lathe, plastic processing machinery, engineering machinery, ship machinery etc.Fig. 5 is that the present invention is used for the plastic injection molding machine hydraulic system example.This hydraulic system has adopted the directly actuated numerical variable pump of scale-of-two (1), and the flow of this oil pump ⑴ is controlled by variable controller (80), and variable controller is taken as 4 grades in the existing example, also can optionally change progression.Variable controller (80) is by micro-electro-hydraulic switch (71), (72), (73), (74) control by programmable controller (99) control.Oil pump is by oil inlet pipe (14), and from fuel tank (13) oil suction, the oil extraction of oil pump (1) arrives the rod end chamber (92) of variable controller (80) by oil pipe (310) and oil pipe (39) through working connection (15); Oil extraction enters the oil-in of micro-electro-hydraulic switch (71), (72), (73), (74) through working connection ⒂ by oil pipe (310) and (311), (312), (313), (314); Oil extraction arrives the oil-in of solenoid directional control valve (16) through working connection ⒂ by oil pipe (211); Oil extraction arrives the oil-in of solenoid directional control valve (17) through working connection (15) by oil pipe (212); Oil extraction arrives the oil-in of solenoid directional control valve (18) through working connection ⒂ by oil pipe (213); Oil extraction arrives the oil-in of solenoid directional control valve (19) through working connection (15) by oil pipe (214); Oil extraction arrives the oil-in of solenoid directional control valve ⒇ through working connection (15) by oil pipe (215).Pre-plastic oil motor (61), injection cylinder (63), the complete machine that solenoid directional control valve (16), (17), (18), (19), (20) are controlled plastic-injection moulding machine respectively advance oil cylinder (65), eject oil cylinder (68), open and close mould oil cylinder (170).Pre-plastic oil motor, injection, complete machine advance, open and close operating modes such as mould all can realize multistep speed regulation.Programmable controller (99) connects with micro-electro-hydraulic switch (71), (72), (73), (74) by lead (44), (45), (46), (47) respectively, this plastic-injection moulding machine is carried out automated procedures control.The action situation of relevant solenoid valve sees Table 1.
Table 1
Fig. 6 represents the speed governing situation in actuation cycle process of this plastic-injection moulding machine.Abscissa is a time T, and ordinate is flow Q, and D1 represents mold closing, and D2 represents injection, and D3 represents pressurize, and D4 represents preformed, and D5 represents cooling, and the D6 representative retreats, and on behalf of Qi Mo D8 representative, D7 eject.
The operating principle of this plastic-injection moulding machine is analyzed as follows (see figure 5):
Motor (93) drives oil pump ⑴ rotation, and motor does not stop the rotation in the course of work, and the flow of oil pump and pressure are controlled respectively by variable controller (80) and surplus valve (4) respectively.
1, mold closing:
(1) safety door is closed:
Travel switch (106), (107) closure, operation circuit is connected, and plastic-injection moulding machine could operate as normal.Programmable controller (99) sends instruction, electromagnet (29), (32) energising, electromagnet (21), (22) energising.
⑵ mold closing and injection seat integral body are advanced:
After electromagnet (21), (22) energising, micro electromagnetic switch (71), (72) middle guiding valve are moved to left, hydraulic oil arrives oil pipe (311), (312) through oil pipe ⒂ again to oil pipe (310), flow through micro-electro-hydraulic switch (71), (72), flow into digital oil cylinder (81), (82) in the variable controller (80) through oil pipe (161), (162), make the piston of digital oil cylinder (81), (82) overhanging, handle the discharge capacity fuel feeding of oil pump with 3/15 Q.
After electromagnet (32) energising, the spool of solenoid directional control valve ⒇ moves to left, the fuel feeding of oil pump, flow to oil pipe (215) through oil pipe ⒂, by solenoid directional control valve ⒇, the oil pipe of flowing through (60), enter mold closing oil cylinder (170), the piston rod of mold closing oil cylinder (170) is moved to right, carry out mold closing action at a slow speed.Simultaneously, after electromagnet (29) energising, the spool of solenoid directional control valve ⒅ moves to left.The fuel feeding of oil pump flows to oil pipe (213) through oil pipe (15), and through solenoid directional control valve ⒅, the oil pipe of flowing through (55) enters the right chamber of injection seat oil cylinder (65), and the piston rod of injection cylinder (65) is moved to left, and often moving injection seat (66) integral body is advanced.Up to the stroke end, touch travel switch (120), variable program controller (99) sends signal again, makes electromagnet (29) outage, and solenoid directional control valve ⒅ resets, and the injection seat process of advancing finishes.Variable program controller (99) continues to keep the "on" position of electromagnet (32).
When driving die device (171), the piston rod of mold closing oil cylinder (170) advances at a slow speed, when running into travel switch (108), programmable controller (99) sends signal, make electromagnet (23), (24) energising, electromagnet (21), (22) outage, at this moment, micro-electro-hydraulic switch (73), (74) spool moves to left in, (71), (72) guiding valve resets, the fuel feeding of oil pump, arrive oil pipe (310) through oil pipe (15), flow to oil pipe (313), (314), by micro-electro-hydraulic switch (73), (74), the oil pipe of flowing through (163), (164), flow into the digital oil cylinder (83) in the variable controller (80), (84), make digital oil cylinder (83), (84) piston is overhanging.Piston in numeral oil cylinder (81), (82) is subjected to (92) to locate oil pressure and withdraw, and fuel tank (13) is flowed back in then flow through oil pipe (161), (162) and micro-electro-hydraulic switch (71), (72) and oil pipe (89), (88) of the oil at this place.Oil pump is realized quick mold closing process with the discharge capacity fuel feeding of 12/15 Q at this moment.When die device (171) is run into travel switch (109) again, programmable controller (99) sends signal, make electromagnet (21), (22) energising, electromagnet (23), (24) outage, this moment micro-electro-hydraulic switch (71), (72) guiding valve moves to right in, (73), (74) guiding valve resets in, the fuel feeding of oil pump, flow to oil pipe (311) through oil pipe ⒂ to oil pipe (310), (312), flow through micro-electro-hydraulic switch (71), (72), through oil pipe (161), (162) the digital oil cylinder (81) in the inflow variable controller (80), (82), make digital oil cylinder (81), (82) piston rod is overhanging, numeral oil cylinder (83), (84) piston rod, be subjected to (92) to locate oil pressure and withdraw this moment, hydraulic oil in the cylinder is (163) by the road, (164) through micro-electro-hydraulic switch (73), (74) and oil pipe (87), (86) flow back to oil pipe ⒀, at this moment, make the discharge capacity fuel feeding of oil pump with 3/15 Q, realize mold closing at a slow speed, this process is after the mould closure, when die device (171) is run into travel switch (110), and oil pressure is when rising to the set pressure of pressure switch (201), programmable controller (99) sends signal, make electromagnet (32) outage, the mold closing operating mode finishes.Meanwhile, programmable controller (99) sends signal, makes electromagnet (27) energising in the solenoid valve (17), and makes electromagnet (21), (22), (23), (24) energising, realizes action of injection.
2, injection:
After electromagnet (21), (22), (23), (24) energising, spool moves to right in little electric liquid switch (71), (72), (73), (74) at this moment.The fuel feeding of oil pump (1), flow to oil pipe (311), (312), (313), (314) through oil pipe ⒂ and oil pipe (310), flow through micro-electro-hydraulic switch (71), (72), (73), (74), digital oil cylinder (81), (82), (83), (84) in oil pipe (161), (162), (163), (164) entering variable controller (80) again, make in the digital oil cylinder (81), (82), (83), (84) piston rod overhanging, handle the discharge capacity fuel feeding of oil pump with 15/15 Q.This moment, the oil extraction of oil pump was switched on because of electromagnet (27), therefore, hydraulic oil flows to oil pipe (212) by solenoid directional control valve (17) through oil pipe ⒂, flow through oil pipe (53) and retaining valve (69) and oil pipe (64), enter the right chamber of injection cylinder (63), the piston rod of injection cylinder (63) is moved to the left, realizes fast injection.The piston rod of injection cylinder (63) is left in the fast moving, when running into travel switch (111), programmable controller (99) sends signal, make electromagnet (21), (23) outage, electromagnet (22), (24) continue energising, the flow that enter the left chamber of injection cylinder (63) this moment is 10/15 Q, has realized second level injection speed duty, when whole injection stroke finishes, the piston rod of injection cylinder (63) is run into travel switch (112), and at this moment, programmable controller (99) sends signal, make electromagnet (22), (23), (24) outage, electromagnet (21) energising at this moment, has only the oil pump flow output of 1/15 Q, surplus valve ⑷ overflow, make injection cylinder (63) be in packing state, programmable controller (99) sends time delayed signal, and the dwell time is controlled by technological requirement.
3, preformed:
After programmable controller (99) time delayed signal reaches the stipulated time, send new signal, make electromagnet (27) outage, the spool of solenoid directional control valve (17) is got back to meta, injection process finishes, simultaneously, programmable controller (99) sends new signal, makes electromagnet (26) energising, electromagnet (22), (24) energising.At this moment, spool moves to right in micro-electro-hydraulic switch (72), (74), the fuel feeding of oil pump, through oil pipe (15), oil pipe (310) flows to oil pipe (312), (314), flow through micro-electro-hydraulic switch (72), (74), again through oil pipe (162), (164), the digital oil cylinder (82) in the entering variable controller (80), (84) make in digital oil cylinder (82), (84) piston rod overhanging.Oil in numeral oil cylinder (81) is subjected to (92) to locate oil pressure and extrude, flowing pipe (161), micro-electro-hydraulic switch (71) and oil pipe (89) and flow back to fuel tank ⒀.Make the discharge capacity fuel feeding of oil pump with 10/15 Q, this moment, hydraulic oil flow to oil pipe (211) through oil pipe ⒂, under electromagnet (26) energising situation, the spool of solenoid directional control valve ⒃ moves to right, this moment, hydraulic oil flow to oil pipe (52) through solenoid directional control valve (16), made pre-plastic oil motor (61) rotation, the rotation of pre-plastic oil motor (61), drive preformed screw rod (67) rotation, plastics are carried out preformed.The fluid that pre-plastic oil motor (61) is discharged returns fuel tank ⒀ through oil pipe (51), solenoid directional control valve (16) and the oil pipe of flowing through (181).The rotation of preformed screw rod, make plastics enter screw head, and preformed screw rod (67) and injection cylinder (63) are retreated, the oil in the right chamber of injection cylinder (63) this moment is through oil pipe (64), flow through counterbalance valve (62) and oil pipe (53) and reversal valve ⒄ and scavenge pipe (182) flows back to fuel tank ⒀, the left chamber of injection cylinder (63) forms vacuum because of retreating of screw rod (67), and hydraulic oil is inhaled into chamber, an injection cylinder left side from fuel tank (13) through oil pipe (182) and solenoid directional control valve ⒄ and oil pipe (54).
Preformed screw rod (67) retreat into predetermined stroke the time, run into travel switch (113), programmable controller (99) sends signal, makes electromagnet (26) outage, makes the spool of solenoid directional control valve ⒃ get back to meta, pre-plastic process finishes.Programmable controller (99) sends signal, make electromagnet (22), (24) outage, micro-electro-hydraulic switch (72), (74) reset at this moment, the piston rod withdrawal of numeral oil cylinder (82), (84), oil pump (1) is in approximate zero discharge capacity operating mode, realize the die cavity cooling procedure, this process is determined cool time by programmable controller (99) internal clock signal.After reaching cool time, programmable controller (99) sends signal again, makes electromagnet (21), (22) energising, has begun the injection seat fallback procedures.
4, injection seat retreats:
Electromagnet (21) and (22) energising, micro electromagnetic switch (71), (72) spool moves to right, the fuel feeding of oil pump (1), flow to oil pipe (311) through oil pipe ⒂, (312), the micro electromagnetic switch (71) of flowing through, (72) again through oil pipe (161), (162) the digital oil cylinder (81) in the entering variable controller (80), (82), make digital oil cylinder (81), (82) piston rod is overhanging in, handle the discharge capacity fuel feeding of oil pump (1) with 3/15 Q, this moment, the oil of oil pump supply flow to oil pipe (213) through oil pipe (15), because of electromagnet (30) energising, the spool of solenoid directional control valve (18) moves right, oil is flowed through solenoid valve (18) again through oil pipe (56), flows into the left chamber of injection seat oil cylinder (65), injection seat oil cylinder piston bar is moved to right drive injection seat (66) to retreat.Injection seat backward travel terminal point is run into travel switch (114), and programmable controller (99) sends signal, makes electromagnet (30) outage, and the spool of solenoid directional control valve ⒅ is got back to the meta injection seat and retreated end.Simultaneously, programmable controller (99) sends signal, makes electromagnet (33) energising, and makes electromagnet (21), (22) switch on, open mold process to begin.
5, Qi Mo:
Electromagnet (21), (22) energising, the spool of micro-electro-hydraulic switch (71), (72) moves to right, the fuel feeding of oil pump (1), flow to oil pipe (311), (312) through oil pipe ⒂, micro-electro-hydraulic switch (71), (72) digital cylinder (81), (82) in oil pipe (161), (162) entering variable controller (80) again of flowing through, make the piston rod of digital oil cylinder (81), (82) overhanging, make the discharge capacity fuel feeding of oil pump with 3/15 Q.This moment, the oil of oil pump supply flow to oil pipe (215) through oil pipe ⒂, solenoid valve this moment (20) is because of electromagnet (33) energising, the spool of solenoid valve (20) moves to right, hydraulic oil flows to oil pipe (59) through solenoid valve (20), enter the right chamber of mold closing oil cylinder (170), the piston rod of mold closing oil cylinder (170) is moved to left, begun to open at a slow speed the line journey.In the piston rod drive die device S. Ast. process of mold closing oil cylinder (170), when running into travel switch (115), programmable controller (99) sends signal, make electromagnet (23), (24) energising, electromagnet (21), (22) outage, this moment is ditto described, will make oil pump ⑴ with 12/15 Q fuel feeding, realizes opening fast the line journey.In the quick fallback procedures of piston rod drive die device of mold closing oil cylinder (170), run into travel switch (116), programmable controller (99) sends signal again, make electromagnet (21), (22) energising, electromagnet (23), (24) outage, also as previously mentioned, make oil pump ⑴, realize opening at a slow speed mould again with 3/15 Q fuel feeding.When the piston rod of mold closing oil cylinder (170) drives the die device S. Ast. to the stroke end, touch travel switch (117), programmable controller (99) sends signal, makes electromagnet (33) outage, opening mold process finishes, meanwhile, programmable controller (99) sends signal, electromagnet (31) energising, electromagnet (23), (24) energising, at this moment, as aforementioned, oil pump will be with 12/15 Q fuel feeding.Hydraulic oil flows to oil pipe (214), at this moment through oil pipe ⒂, the spool of solenoid directional control valve ⒆ is shifted to right position, and hydraulic oil flows into oil pipe (58) through solenoid valve ⒆, enter the right chamber that ejects oil cylinder (68), the piston rod that ejects oil cylinder (68) is moved right, plastic products are ejected mould.Eject the oil in the right chamber of oil cylinder (68), through oil pipe (57), solenoid directional control valve of flowing through (19) and oil pipe (184) stream return fuel tank ⒀.The piston rod that ejects oil cylinder (68) is shifted to the right to the precalculated position, touches travel switch (118), and programmable controller (99) sends signal; Electromagnet (31) outage, under spring (88) effect, solenoid valve (19) valve core reset, this moment, oil pump came oil behind solenoid valve (19), flowed to oil pipe (57), entered the right chamber that ejects oil cylinder (68), made to eject the withdrawal of oil cylinder (68) piston rod.Return the terminal point of stroke ejecting oil cylinder (68) piston rod, eject oil cylinder (68) piston rod and touch travel switch (119), make programmable controller (99) send signal: electromagnet (29), (32) energising, electromagnet (21), (23) energising.Next program is started working.If this moment, safety door was opened, then open travel switch (106), (107), programmable controller this moment (99) sends signal, and electromagnet (21), (22), (23), (24) all cut off the power supply, and this moment, oil pump was in the zero flow operating mode work that is similar to.
Plastic injection molding machine hydraulic system shown in Figure 5, after having adopted the direct control variable pumping system of scale-of-two, the required flow of above-mentioned each operating mode sends signal by programmable controller (99) and regulates, therefore, surplus valve in the system (4) only plays safety effect, there is not oil to flow out from surplus valve (4), thus the hydraulic energy loss that does not produce unnecessary oil and caused.When the pressurize operating mode, can compile the signal that journey controller (99) sends and make oil pump feed amount minimum, be the flow of 1/15 Q in this example, this flow is to keep the flow through minimum flow of the required level pressure effect of surplus valve (4) of hydraulic oil, and therefore loss has reduced to minimum degree.
If the surplus valve of hydraulic system (4) set pressure also needs to align under different operating modes, can go up as the variable controller among Fig. 5 (80) and micro electromagnetic switch (71), (72), (73), (74) in the repacking of the pressure regulation turn-knob position of surplus valve (4), different strokes by digital oil cylinder in the variable controller, the decrement of the pre-compressed spring of control surplus valve (4) is regulated thereby reach different pressure.
The plastic-injection moulding machine of Fig. 5 introduction is to adopt programmable controller (99) to realize automatic program control, just realizes system controlled by computer.If because of the limitation of conditions, do not adopt microcomputer, this system also can be easily to electromagnet (21), (22), (23), (24) carry out relay switch control, need only at each travel switch: (106), (107), (108), (109), (110), (112), (113), (114), (115), (116), (117), (118), (119) on the circuit, as shown in Figure 7 control relay circuit in the parallel connection, according to relevant operating mode, change socket switch in this circuit (201), (202), (203), (204) break-make situation, control electromagnet (21), (22), (23), (24) power on/off, also can reach the effect of the flow control adjusting of introducing previously, relevant socket is logical, disconnected situation is shown in Table 2.
In sum, hydraulic governor by direct control of the present invention can be applied in the hydraulic speed regulation system of plastics machinery, lathe, engineering machinery, ship machinery, reach system controlled by computer with cheap cost, realize the positive displacement speed governing, more more energy-conservation than advanced at present ratio regulating load sensory system or proportionality velocity modulation system, can avoid adopting complicated electron-amplifier or D/A converter, reduce cost and maintenance level, reliable operation.Expect that hydraulic governor by direct control of the present invention can obtain promotion and application in all kinds of machineries.
Description of drawings:
Fig. 1: existing ratio regulating load sensory system schematic diagram.
Fig. 2: by the hydraulic governor by direct control schematic diagram of the present invention's design.
Fig. 3: micro-electro-hydraulic switch excitation and oil pump capacity graph of a relation.
Fig. 4: the schematic diagram of programmable controller.
Fig. 5: the present invention is used for the plastic injection molding machine hydraulic system example.
Fig. 6: the plastic-injection moulding machine flow circular chart that exemplifies.
Fig. 7: control relay circuit figure.
Table 2
Claims (4)
1, a kind of hydraulic governor by direct control is made up of variable output pump (1), variable control device, reversal valve (7), topworks (98), load (9) and surplus valve (4).Its technical characterictic is that said variable control device is the direct control device of a kind of scale-of-two.This device is made up of variable controller (80), micro-electro-hydraulic switch group (70) and programming controller (99).Variable controller (80) is made up of multi-stage oil cylinder, and separate between at different levels, stroke increases step by step, and after the variable output pump coupling its flow is increased progressively by the binary number magnitude relation.Independently by a micro-electro-hydraulic switch control, micro-electro-hydraulic switch at different levels is formed micro-electro-hydraulic switch group (70) to each level of variable controller together respectively.Change the folding of each micro-electro-hydraulic switch by programming controller (99), make the corresponding stage action of variable controller (80) or be failure to actuate, thereby the flow changing curve that adds up out and change by the binary number magnitude relation satisfies the requirement of system load.
2, a kind of as the said hydraulic governor by direct control of claim 1, its technical characterictic is, said programming controller (99) is a kind of programmable controller, and it is made up of microcomputer, interface element and voltage amplifier (36) etc.Pass through programmable controller, the certain binary signal of control microcomputer output, amplify through voltage amplifier (36), make it driving circuit voltage matches with micro-electro-hydraulic switch group (70), directly drive micro-electro-hydraulic switch, reach the purpose of regulating flow, the centre need not the D/A conversion.
3, a kind of as the said hydraulic governor by direct control of claim 1, its technical characterictic is, said programming controller (99) is by being contained in travel switch mechanically and relay constitutes or be made of the fixed routine controller.By programming controller, realize the fixed routine control of hydraulic fluid flow rate.
4, a kind of claims 1,2,3 said hydraulic governor by direct control, its technical characterictic is that this system is as plastic injection molding machine hydraulic system.By said hydraulic governor by direct control, realize that preformed, injection, complete machine advance, eject, open and close the multistep speed regulation control of the control of mould and preformed, injection speed, keying mould speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103339.3A CN1003802B (en) | 1985-04-01 | 1985-04-01 | Hydraulic governor by direct control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103339.3A CN1003802B (en) | 1985-04-01 | 1985-04-01 | Hydraulic governor by direct control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103339A true CN85103339A (en) | 1987-01-17 |
| CN1003802B CN1003802B (en) | 1989-04-05 |
Family
ID=4793122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103339.3A Expired CN1003802B (en) | 1985-04-01 | 1985-04-01 | Hydraulic governor by direct control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003802B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422557C (en) * | 2006-04-04 | 2008-10-01 | 联塑(杭州)机械有限公司 | Control method for energy saving of hydraulic machinery or raising prodn. efficiency |
| CN108869160A (en) * | 2018-05-08 | 2018-11-23 | 陶德豪 | Digital drive system and its shift control method |
-
1985
- 1985-04-01 CN CN85103339.3A patent/CN1003802B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422557C (en) * | 2006-04-04 | 2008-10-01 | 联塑(杭州)机械有限公司 | Control method for energy saving of hydraulic machinery or raising prodn. efficiency |
| CN108869160A (en) * | 2018-05-08 | 2018-11-23 | 陶德豪 | Digital drive system and its shift control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1003802B (en) | 1989-04-05 |
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