CN106762892A - A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control - Google Patents

A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control Download PDF

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Publication number
CN106762892A
CN106762892A CN201710079273.3A CN201710079273A CN106762892A CN 106762892 A CN106762892 A CN 106762892A CN 201710079273 A CN201710079273 A CN 201710079273A CN 106762892 A CN106762892 A CN 106762892A
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CN
China
Prior art keywords
valve
mouthfuls
way pump
control valve
check valve
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CN201710079273.3A
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Chinese (zh)
Inventor
明勇
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南京麦克菲自动控制有限公司
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Priority to CN201710079273.3A priority Critical patent/CN106762892A/en
Publication of CN106762892A publication Critical patent/CN106762892A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16Control arrangements for fluid-driven presses
    • B30B15/166Electrical control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/20507Type of prime mover
    • F15B2211/20515Electric motor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71Multiple output members, e.g. multiple hydraulic motors or cylinders

Abstract

The invention provides a kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control, including compensation block and two two-way pump control valve groups being connected with compensation block;Compensation block includes proportional pressure-reducing valve, two-way pump control valve group includes the first solenoid directional control valve, the second solenoid directional control valve, the first safety valve, counterbalance valve, the check valve of magnetic valve first, the second check valve, the 3rd check valve, the second safety valve, the 4th check valve and the 5th check valve, and advantage is:Spill losses is reduced to greatest extent;Realize stepless time adjustment;Reduce restriction loss;The dispensing of demand oil mass can accurately be carried out;There is no idle power;, up to 200mm/s, work speed is up to 20mm/s for fast lower and return speed;Debugging is faster easier;Compact overall structure, installed capacity is small;The reduction of oil cylinder difficulty of processing;Reduce CO2Discharge, reduces pollution;Servomotor can significantly overload in a short time;Reduce hydraulic oil to use, be traditional 20% with oil mass;The cooling of hydraulic oil is reduced or eliminated, noise is reduced.

Description

A kind of numerical control bending machine hydraulic system of use BID-SVP hybrid powers control

Technical field

The present invention relates to bender technical field of hydraulic pressure, more particularly to the number that a kind of use BID-SVP hybrid powers are controlled Control bender hydraulic system.

Background technology

Hydraulic system is the core of hydraulic bending press, and it drives hydraulic pump output pressure fluid to drive by motor Oil cylinder completes the work of hydraulic bending press, and prior art hydraulic system chief component is essentially identical.Bender hydraulic system Effect be make bender realize F.F., work enter, pressurize, the action of return, it is desirable to action process must steadily, impact it is small, make During in the case where the cleannes of operating mode and medium are general, the fault rate of hydraulic system should be as low as possible.

At present, the existing multiplex proportioning valve of numerical control bending machine hydraulic system controls synchronization, and its energy consumption is big, and hydraulic oil holds Easily heating, influences the operating efficiency and bending precision of bender, while can also reduce the service life of bender, increase maintenance with Replacement cost.

The content of the invention

To solve the above problems, the invention discloses a kind of numerical control bender liquid of use BID-SVP hybrid powers control Pressure system.

In order to reach object above, the present invention provides following technical scheme:

A kind of numerical control bending machine hydraulic system of use BID-SVP hybrid powers control, it is characterised in that:Including compensation block and with Two two-way pump control valve groups of compensation block connection;The compensation block includes proportional pressure-reducing valve, P mouthfuls point of the proportional pressure-reducing valve Not Tong Guo the 6th check valve and the 7th check valve be connected with the intraoral sides of the P1 of compensation block and the intraoral sides of P2, P1 mouthfuls of the compensation block Outside and P2 mouthfuls of outside are connected with a two-way pump control valve group respectively, and A mouthfuls of outside of compensation block is connected with compensation cylinder, compensation block T mouthfuls outside be connected with the first fuel tank, the two-way pump control valve group is connected with oil cylinder and two-way pump;The two-way pump control valve Group includes the first solenoid directional control valve, the second solenoid directional control valve, the first safety valve, counterbalance valve, the check valve of magnetic valve first, the second list To valve, the 3rd check valve, the second safety valve, the 4th check valve and the 5th check valve, the P2 of the two-way pump control valve group is intraoral Pacify with the intraoral sides of the M2 of two-way pump control valve group, one end of the 3rd check valve, P mouthfuls of the first solenoid directional control valve and second respectively side P mouthfuls of connection of full valve, the other end of the 3rd check valve is connected by throttle orifice with P mouthfuls of the second solenoid directional control valve, described First solenoid directional control valve T mouthfuls T mouthfuls, T mouthfuls of the second solenoid directional control valve, first safety by throttle orifice respectively with the second safety valve T mouthfuls of valve and the T of two-way pump control valve group intraoral side connection, B mouthfuls of second solenoid directional control valve and two-way pump control valve group The connection of X intraoral sides, B mouthfuls of first solenoid directional control valve respectively with one end and one end of the 5th check valve of the 4th check valve The other end of connection, the other end of the 4th check valve and the 5th check valve is in parallel, and P1 mouthfuls with compensation block and B it is intraoral Side connects, the intraoral sides of A of the two-way pump control valve group respectively with counterbalance valve P mouthfuls, one end of magnetic valve and two-way pump control The intraoral side connection of the FA of valve group processed, T mouthfuls of the counterbalance valve is in parallel with the other end of magnetic valve, and with one end of the first check valve Connected with one end of the second check valve, the other end of first check valve and the other end of the second check valve are in parallel, and with the P mouthfuls of one safety valve, the intraoral sides of two-way pump control valve group M1 and the intraoral side connections of P1.

Further, the oil cylinder is connected with the second fuel tank, cylinder upper cavity oil and two-way pump control valve by normally opened replenishing valve B mouthful outside connection of group, is connected on the outside of A mouthfuls of oil cylinder cavity of resorption and two-way pump control valve group, the normally opened replenishing valve and two-way pump X mouthfuls of outside connection of control valve group.

Further, the two-way pump is connected with the 3rd fuel tank, one end of the two-way pump respectively with two-way pump control valve P1 mouthful outside of group and the connection of the 3rd fuel tank, the two-way pump other end respectively with P2 mouthful of two-way pump control valve group on the outside of and it is the 3rd oily Case is connected.

Compared with prior art, the beneficial effects of the present invention are:

1st, spill losses can to greatest extent be reduced;

2nd, stepless time adjustment is capable of achieving, adjustable range is 0 to maximum;

3rd, without proportional valve control, restriction loss is reduced;

4th, the dispensing of demand oil mass can be accurately carried out, integrated hydraulic system is optimized by the speed of dynamic servomotor System;

5th, without idle power:When flow or pressure is not needed, servomotor can be closed;

6th, up to 200mm/s, work speed is up to 20mm/s, high working efficiency for fast lower and return speed;

7th, designed using unique open type replenishing valve, it is to avoid the trouble being vented during debugging, debugging is faster easier;

8th, compact overall structure, install convenient, installed capacity reduces;

9th, the difficulty of processing reduction of oil cylinder, reduces cost;

10th, for machine tool manufacturer, overall variation very little is easy to manufacture;

11st, energy ezpenditure and thermal balance are greatly reduced, and reduce CO2 discharges, reduce the pollution to air;

12nd, servomotor can significantly overload in a short time;

13rd, can according to actual needs reduce volume of fuel tank, reduce the use of hydraulic oil, while be only traditional 20% with oil mass, section About space and cost;

14th, reduce or eliminate the cooling of hydraulic oil, and reduce noise when bender works.

Brief description of the drawings

Fig. 1 is a kind of hydraulic principle of the numerical control bending machine hydraulic system of use BID-SVP hybrid powers control of the invention Figure.

Fig. 2 is compensation block in the numerical control bending machine hydraulic system that a kind of use BID-SVP hybrid powers of the invention are controlled Hydraulic schematic diagram.

Fig. 3 is two-way pump control in the numerical control bending machine hydraulic system that a kind of use BID-SVP hybrid powers of the invention are controlled The hydraulic schematic diagram of valve group processed.

Reference numerals list:

The solenoid directional control valves of 1- first, the solenoid directional control valves of 2- second, the safety valves of 3- first, 4- counterbalance valves, 5- magnetic valves, 6- first is single To valve, the check valves of 7- second, the check valves of 8- the 3rd, the safety valves of 9- second, the check valves of 10- the 4th, the check valves of 11- the 5th, 12- is double To pump, 13- oil cylinders, the normally opened replenishing valves of 14-, 15- proportional pressure-reducing valves, 16- compensation cylinders, the fuel tanks of 17- first, the fuel tanks of 18- second, The fuel tanks of 19- the 3rd, the check valves of 20- the 6th, the check valves of 21- the 7th.

Specific embodiment

With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only For illustrating the present invention rather than limitation the scope of the present invention.

As illustrated, a kind of numerical control bending machine hydraulic system of use BID-SVP hybrid powers control, including compensation block and Two two-way pump control valve groups being connected with compensation block.

Wherein, compensation block includes proportional pressure-reducing valve 15, and P mouthful of proportional pressure-reducing valve 15 passes through the 6th check valve 20 and the respectively Seven check valves 21 are connected with the intraoral sides of the P1 of compensation block and the intraoral sides of P2, respectively with one on the outside of P1 mouthfuls of compensation block outside and P2 mouthfuls Individual two-way pump control valve group connection, A mouthfuls of outside of compensation block is connected with compensation cylinder 16, and T mouthfuls of outside of compensation block is connected with first Fuel tank 17, two-way pump control valve group is connected with oil cylinder 13 and two-way pump 12.

Two-way pump control valve group includes the first solenoid directional control valve 1, the second solenoid directional control valve 2, the first safety valve 3, counterbalance valve 4th, magnetic valve 5, the first check valve 6, the second check valve 7, the 3rd check valve 8, the second safety valve 9, the 4th check valve 10 and the 5th Check valve 11, the intraoral sides of P2 of two-way pump control valve group respectively with the intraoral sides of the M2 of two-way pump control valve group, the 3rd check valve 8 One end, P mouthfuls of connection of P mouthfuls of the first solenoid directional control valve 1 and the second safety valve 9, the other end of the 3rd check valve 8 pass through throttle orifice P mouthfuls with the second solenoid directional control valve 2 is connected, first solenoid directional control valve 1T mouthfuls by throttle orifice respectively with the T of the second safety valve 9 Mouthful, T mouthful of the second solenoid directional control valve 2, the intraoral sides of T of T mouthfuls of the first safety valve 3 and two-way pump control valve group connect, second B mouthfuls of solenoid directional control valve 2 is connected with the intraoral sides of the X of two-way pump control valve group, and B mouthfuls of the first solenoid directional control valve 1 respectively with the 4th One end connection of one end of check valve 10 and the 5th check valve 11, the other end of the 4th check valve 10 and the 5th check valve 11 it is another One end is in parallel, and P1 mouthfuls with compensation block and the intraoral sides of B be connected, the intraoral sides of A of two-way pump control valve group respectively with counterbalance valve 4 P mouthfuls, the intraoral side connections of FA of one end of magnetic valve 5 and two-way pump control valve group, T mouthfuls of counterbalance valve 4 be another with magnetic valve 5 One end is in parallel, and one end and one end of the second check valve 7 with the first check valve 6 is connected, the other end of the first check valve 6 and the The other end of two check valves 7 is in parallel, and P mouthful with the first safety valve 3, the intraoral sides of two-way pump control valve group M1 and the intraoral side companies of P1 Connect.

In the present embodiment, oil cylinder 13 is connected with the second fuel tank 18 by normally opened replenishing valve 14, the epicoele of oil cylinder 13 with it is two-way B mouthfuls of outside connection of pump control valve group, the cavity of resorption of oil cylinder 13 is connected with A mouthfuls of outside of two-way pump control valve group, normally opened replenishing valve 14 It is connected with X mouthfuls of outside of two-way pump control valve group.Two-way pump 12 is connected with the 3rd fuel tank 19, one end of two-way pump 12 respectively with it is double Connected to P1 mouthfuls of pump control valve group outside and the 3rd fuel tank 19, the other end of two-way pump 12 respectively with the P2 of two-way pump control valve group Connected with the 3rd fuel tank 19 on the outside of mouthful.

A kind of numerical control bending machine hydraulic system of present invention use BID-SVP hybrid powers control by Hydraulic Station, compensation block, Normally opened replenishing valve 14, grating scale etc. is constituted.System is acted and speed with the direct control cylinder of servo motor driven oil pump rotating The novel numerical control bender control device of regulation.Hydraulic Station includes servomotor, double steering plunger displacement pump, check valve, two-way pump control Valve group processed etc..

This hydraulic system uses the oil inlet and outlet of Serve Motor Control double steering pump, pump to change with the change for turning to, Output flow increases as the rotating speed of motor increases, and reduces and reduces;Two-way pump control valve group has two, the upper and lower chamber of oil cylinder Independent control loop;The epicoele control loop of oil cylinder 13 sets the control of the second solenoid directional control valve 2 replenishing valve, lower turn soon of control cylinder Under slow;The backhaul of first solenoid directional control valve, 1 control cylinder 13 is set and looks for reference point;Overflow valve is set used as the epicoele safety valve of oil cylinder 13 9.Oil cylinder cavity of resorption control loop is set under the speed of 5 control cylinder of magnetic valve 13;Setting counterbalance valve 4 controls slow lower compacting, position to lock It is fixed;Servomotor is turned to by control oil pump, changes oil pump oil inlet and outlet, changes control valve group oil stream direction, realizes bender Under oil cylinder is fast, it is slow lower and return to, with the change of servomotor rotating speed, oil pump oil pump capacity is accordingly increased or decreased, and realizes oil Cylinder speed is automatically adjusted.

Principle explanation(The hydraulic schematic diagram of reference picture 1).

First, working cycles:

1st, under fast:The Y1 of magnetic valve 5 obtains electric.Positive voltage signal is input into servomotor controller(+ 8V or so), two-way pump 12 is just Turn, 12 times hydraulic fluid ports of two-way pump are by the cavity of resorption oil extraction of oil cylinder 13 and check valve oil suction, and upper hydraulic fluid port is fuel-displaced.Because sliding block deadweight is quick Decline, fluid sucks the epicoele of oil cylinder 13 by normally opened replenishing valve 14, and oil pump 13 is fuel-displaced by the first solenoid directional control valve 1 in addition(P→ B), the 4th check valve 10 enter the epicoele of oil cylinder 13.The fluid of the cavity of resorption of oil cylinder 13 is returned to two-way by magnetic valve 5, the first check valve 6 12 times hydraulic fluid ports of pump(Inlet port).Sliding block descend soon speed can by adjust Serve Motor Control voltage control servomotor rotating speed and obtain To friction speed.

2nd, work is entered:Positive voltage signal is input into servomotor controller(+ 8V or so).The Y2 of the second magnetic valve 2 obtains electric, Close normally opened replenishing valve 14, the Y1 dead electricity of magnetic valve 5, the pressure oil of the discharge of two-way pump 12, by the first solenoid directional control valve 1(P →B), the 4th check valve 10 enter the epicoele of oil cylinder 13.The fluid of the cavity of resorption of oil cylinder 13 is returned to double by counterbalance valve 4, the first check valve 6 To 12 times hydraulic fluid ports of pump(Inlet port).Sliding block is pushed.Obtained by adjusting Serve Motor Control voltage control servomotor rotating speed Different work speeds.First safety valve 3 is to prevent the cavity of resorption hypertonia of oil cylinder 13, and setting pressure ratio system pressure is high by 10%, back pressure The setting pressure of valve 4 is generally balance pressure and adds(30~50)bar.

3rd, pressurize:The Y2 of the second solenoid directional control valve 2 obtains electric, when sliding block is reached after bottom dead center, gives servomotor certain voltage Compensation two-way pump 12 is leaked, and sliding block is stopped on bottom dead centre.

4th, off-load:After bender pressurize terminates, the epicoele of oil cylinder 13 remains in that pressure.The Y2 dimensions of the second solenoid directional control valve 2 Hold electric, give servomotor controller certain negative voltage motor reversal, while sliding block also can be micro up, the epicoele of oil cylinder 13 is unloaded Lotus.The Y2 of the second solenoid directional control valve 2 dead electricity in pressure release 200ms.

5th, return:During solenoid directional control valve dead electricity, negative voltage signal is input into servomotor controller(- 8V or so), it is two-way Pump 12 is inverted, and hydraulic fluid port is by check valve oil suction on two-way pump 12, and lower hydraulic fluid port is fuel-displaced.Pressure oil is through the second check valve 7, magnetic valve 5 Into the cavity of resorption of oil cylinder 13.Sliding block is quickly returned.The hydraulic oil of the epicoele of oil cylinder 13 discharge passes through 14 times the second fuel tanks of normally opened replenishing valve 18.Opening speed can control servomotor rotating speed and obtain friction speed by adjusting Serve Motor Control voltage.

6th, reference point is found:The Y3 of the first solenoid directional control valve 1 obtains electric, and certain negative voltage letter is input into servomotor controller Number, two-way pump 12 is inverted, and hydraulic fluid port is by check valve oil suction on two-way pump 12, and lower hydraulic fluid port is fuel-displaced.Pressure oil through the second check valve 7, Magnetic valve 5 enters the cavity of resorption of oil cylinder 13, and sliding block is returned slowly.

2nd, workbench compensation:

The compensation of workbench is completed by controlling the Y4 of proportional pressure-reducing valve 15, and pressure oil enters compensation cylinder through proportional pressure-reducing valve 15 16, by the pressure for adjusting the voltage of proportional pressure-reducing valve 15 to adjust proportional pressure-reducing valve 15, make workbench plus convex, during compensation bending The deflection of workbench.

Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned implementation method, also includes Constituted technical scheme is combined by above technical characteristic.It should be pointed out that for those skilled in the art For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as Protection scope of the present invention.

Claims (3)

1. the numerical control bending machine hydraulic system that a kind of use BID-SVP hybrid powers are controlled, it is characterised in that:Including compensation block and Two two-way pump control valve groups being connected with compensation block;
The compensation block includes proportional pressure-reducing valve(15), the proportional pressure-reducing valve(15)P mouthfuls respectively pass through the 6th check valve (20)With the 7th check valve(21)It is connected with the intraoral sides of the P1 of compensation block and the intraoral sides of P2, P1 mouthfuls of compensation block outside and P2 It is connected with a two-way pump control valve group respectively on the outside of mouthful, A mouthfuls of outside of compensation block is connected with compensation cylinder(16), the T of compensation block The first fuel tank is connected with the outside of mouthful(17), the two-way pump control valve group is connected with oil cylinder(13)And two-way pump(12);
The two-way pump control valve group includes the first solenoid directional control valve(1), the second solenoid directional control valve(2), the first safety valve(3)、 Counterbalance valve(4), magnetic valve(5), the first check valve(6), the second check valve(7), the 3rd check valve(8), the second safety valve(9)、 4th check valve(10)With the 5th check valve(11), the intraoral sides of P2 of the two-way pump control valve group respectively with two-way pump control valve The intraoral sides of M2, the 3rd check valve of group(8)One end, the first solenoid directional control valve(1)P mouthfuls and the second safety valve(9)P mouthfuls even Connect, the 3rd check valve(8)The other end pass through throttle orifice and the second solenoid directional control valve(2)P mouthfuls connection, it is described first electricity Magnetic reversal valve(1)T mouthfuls by throttle orifice respectively with the second safety valve(9)T mouthfuls, the second solenoid directional control valve(2)T mouthfuls, first Safety valve(3)T mouthfuls and two-way pump control valve group the connection of T intraoral sides, second solenoid directional control valve(2)B mouthfuls with it is two-way The intraoral side connections of X of pump control valve group, first solenoid directional control valve(1)B mouthfuls respectively with the 4th check valve(10)One end With the 5th check valve(11)One end connection, the 4th check valve(10)The other end and the 5th check valve(11)The other end Parallel connection, and P1 mouthfuls with compensation block and the intraoral sides of B be connected, the intraoral sides of A of the two-way pump control valve group respectively with counterbalance valve (4)P mouthfuls, magnetic valve(5)One end and two-way pump control valve group the connection of FA intraoral sides, the counterbalance valve(4)T mouthfuls with Magnetic valve(5)The other end it is in parallel, and with the first check valve(6)One end and the second check valve(7)One end connection, described the One check valve(6)The other end and the second check valve(7)The other end it is in parallel, and with the first safety valve(3)P mouthfuls, two-way pump The intraoral sides of control valve group M1 and the intraoral side connections of P1.
2. the numerical control bending machine hydraulic system that a kind of use BID-SVP hybrid powers according to claim 1 are controlled, it is special Levy and be:The oil cylinder(13)By normally opened replenishing valve(14)It is connected with the second fuel tank(18), oil cylinder(13)Epicoele and two-way pump B mouthfuls of outside connection of control valve group, oil cylinder(13)Cavity of resorption is connected with A mouthfuls of outside of two-way pump control valve group, the normally opened topping up Valve(14)It is connected with X mouthfuls of outside of two-way pump control valve group.
3. the numerical control bending machine hydraulic system that a kind of use BID-SVP hybrid powers according to claim 2 are controlled, it is special Levy and be:The two-way pump(12)It is connected with the 3rd fuel tank(19), the two-way pump(12)One end respectively with two-way pump control P1 mouthfuls of outside of valve group and the 3rd fuel tank(19)Connection, two-way pump(12)The other end is outer with P2 mouthfuls of two-way pump control valve group respectively Side and the 3rd fuel tank(19)Connection.
CN201710079273.3A 2017-02-14 2017-02-14 A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control CN106762892A (en)

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CN201710079273.3A CN106762892A (en) 2017-02-14 2017-02-14 A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control

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CN201710079273.3A CN106762892A (en) 2017-02-14 2017-02-14 A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control

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Application publication date: 20170531

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