CN107676316A - A kind of braking control system and control method applied to hydraulic open system - Google Patents

A kind of braking control system and control method applied to hydraulic open system Download PDF

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Publication number
CN107676316A
CN107676316A CN201711083215.4A CN201711083215A CN107676316A CN 107676316 A CN107676316 A CN 107676316A CN 201711083215 A CN201711083215 A CN 201711083215A CN 107676316 A CN107676316 A CN 107676316A
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CN
China
Prior art keywords
valve
oil
pressure
hydraulic motor
hydraulic
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Pending
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CN201711083215.4A
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Chinese (zh)
Inventor
高英杰
朱士琦
于凯
翟畅
崔彭博
常飞翔
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Yanshan University
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Yanshan University
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Priority to CN201711083215.4A priority Critical patent/CN107676316A/en
Publication of CN107676316A publication Critical patent/CN107676316A/en
Pending legal-status Critical Current

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    • 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
    • F15B11/08Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401Valve members; Fluid interconnections therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00External control of clutches
    • F16D48/06Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/066Control of fluid pressure, e.g. using an accumulator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00External control of clutches by electric or electronic means
    • F16D2500/70Details about the implementation of the control system
    • F16D2500/706Strategy of control
    • F16D2500/7061Feed-back
    • F16D2500/70626PID control

Abstract

The invention discloses a kind of braking control system and control method applied to hydraulic open system, the braking control system includes three position four-way directional control valve A, three position four-way directional control valve B, Braking mode valve group and hydraulic motor;The Braking mode valve group is control valve block, and the valve block includes the first oil-feed logical valve, the second oil-feed logical valve, the first stop valve, the second stop valve, the first safety valve and the second safety valve, the first automatic brake valve and the second automatic brake valve.The present invention is by brake fluid system automatic regulating system pressure, compared with tradition machinery is braked, it is not necessary to which driver's frequent starting and closing are braked, and avoid operator's high-intensity operation, while improve operating efficiency.Brakes uses closed-loop control, ensures Steady speed when weight declines, and prevents the frequent start-stop using mechanical braking, and then reduces the impact to hydraulic system and the damage of mechanical structure, ensures the safety and reliability of the course of work.

Description

A kind of braking control system and control method applied to hydraulic open system
Technical field
The invention belongs to braking control system field, be related to a kind of braking control system applied to hydraulic open system and Its control method.
Background technology
In engineering machinery, such as in hoisting system, it may appear that such a phenomenon, due to hydraulic motor pressure oil circuit pressure Power deficiency, weight can be because deadweight be voluntarily fallen, or even generation hypervelocity motion, this phenomenon are called Exceed load in hydraulic pressure and showed As.This phenomenon can cause serious potential safety hazard.Therefore, it is necessary to effective brakes is added in hydraulic system.
At present, braking system of engineering machinery is most uses conventional brake, and main method is the system by mechanical friction Dynamic device and hydraulic braking.Under Exceed load operating mode, the frequent use of mechanical brake can accelerate braking member to wear and cause Braking ability declines, and frequently start-stop causes energy dissipation, and makes operator easily tired.Therefore, engineering machinery is badly in need of a kind of , due to whereabouts of conducting oneself with dignity, or even the brakes of generation hypervelocity phenomenon, ensure speed stability and the peace that works applied to weight is prevented Quan Xing.
The content of the invention
It is a kind of by control system regulation automatic brake valve present invention aims at providing, negative sense load force is balanced, is reached Open type drive system speed when object rises, fallen is steady, the safe operation control for brake applied to hydraulic open system System and control method.
To achieve the above object, following technical scheme is employed:Braking control system of the present invention includes 3-position 4-way Reversal valve A, three position four-way directional control valve B, Braking mode valve group and hydraulic motor;
The Braking mode valve group is control valve block, the valve block include the first oil-feed logical valve, the second oil-feed logical valve, First stop valve, the second stop valve, the first safety valve and the second safety valve, the first automatic brake valve and the second automatic brake valve; The P mouths of the three-position four-way electromagnetic directional valve A are connected with pressure oil, and T mouths are connected with fuel tank, A mouths and the first oil-feed logic The oil inlet of valve is connected, and B mouths are connected with the oil inlet of the second oil-feed logical valve;First oil inlet of the hydraulic motor with The oil return opening of first oil-feed logical valve, the oil inlet of the first stop valve, the oil inlet of the first safety valve, the first automatic brake valve Oil inlet is connected with three position four-way directional control valve B P mouths;Second oil inlet of the hydraulic motor and the second oil-feed logical valve Oil return opening, the oil inlet of the second stop valve, the oil inlet of the second safety valve, the oil inlet and 3-position 4-way of the second automatic brake valve Reversal valve B P mouths are connected;The oil return opening of the oil inlet of first stop valve and the first oil-feed logical valve, the first safety valve Oil inlet, the oil inlet of the first automatic brake valve, 3-position 4-way proportional reversing valve B P mouths, the first oil inlet of hydraulic motor It is connected;The oil return opening of first stop valve is connected with oil return opening, the fuel tank of the second stop valve;The oil-feed of second stop valve Oil return opening, the oil inlet of the second safety valve, the oil inlet of the second automatic brake valve, the 3-position 4-way of mouth and the second oil-feed logical valve Proportional reversing valve B P mouths, the second oil inlet of hydraulic motor are connected;The oil return opening of first automatic brake valve with it is described The oil return opening of second automatic brake valve, the oil return opening of the first safety valve, the oil return opening of the second safety valve are connected with fuel tank;It is described 3-position 4-way proportional reversing valve B T mouths are connected with fuel tank, and A mouths are connected with the control port of the first oil-feed logical valve, B mouths Control port with the second oil-feed logical valve is connected.
Further, the braking control system also includes electronic control unit ECU, first pressure sensor and the second pressure Force snesor;The first pressure sensor is connected on the pipeline of the first oil inlet of hydraulic motor, for detecting hydraulic pressure horse Up to the pressure value of the first oil inlet, it exports electric signal and is connected with electronic control unit input;The second pressure sensor It is connected on the pipeline of the oil inlet of hydraulic motor second, for detecting two-way hydraulic motor the second inlet pressure value, it is exported Electric signal is connected with electronic control unit input;The electronic control unit (ECU) is that industrial machinery often uses controller, can be with Controlling switch valve valve port, its input collection first pressure sensor and second pressure sensor signal, are entered by internal processes Row closed-loop control computing and PID regulation computings, are converted into electric signal by operation result, control the first automatic brake valve and second Automatic brake valve.
Further, the three position four-way directional control valve A is solenoid directional control valve, and the hydraulic motor is two-way hydraulic motor, First automatic brake valve and the second automatic brake valve are electromagnetic proportion relief valve, the unlatching of adoption rate magnet control valve Pressure;First stop valve, the second stop valve, the first oil-feed logical valve and the second oil-feed logical valve are the inserting of cover plate Stop valve;First safety valve and the second safety valve are the inserting overflow valve of cover plate.
A kind of control method of braking control system applied to hydraulic open system, including following content:
The hydraulic fluid port of hydraulic motor first and second are obtained by first pressure sensor and second pressure sensor respectively first The pressure value of hydraulic fluid port;
When the right position work of three position four-way directional control valve A, three position four-way directional control valve B is in middle position, and now hydraulic oil directly flows Oil return box, two-way hydraulic motor are failure to actuate;When three position four-way directional control valve B is in the work of left position, now hydraulic oil flows through three Four-way reversing valve B enters the second oil-feed logical valve control port, closes the second logic inlet valve oil inlet, prevents fluid from falling Stream, now the first oil inlet of hydraulic motor oil-feed, the second oil inlet is fuel-displaced, and now electronic control unit, which sends electric signal, makes first Automatic brake valve is in maximum Opening pressure state, and the second automatic brake valve is in minimum Opening pressure state, the first stop valve Valve port is closed, and the second stop valve fully opens, and hydraulic oil flows out from three position four-way directional control valve A A mouths, by the first oil-feed logic Valve, into the oil inlet of hydraulic motor first, hydraulic oil is discharged from the second oil inlet of hydraulic motor, into the second stop valve, this When because the second Braking mode valve opening pressure is zero, the second stop valve valve port standard-sized sheet, hydraulic oil is returned by the second stop valve Fuel tank;
When hydraulic motor is when the first inlet pressure value is less than pressure preset, now electronic control unit judges occur Exceed load phenomenon, the second automatic brake valve setting electric signal is given, the second cut-off valve opening pressure change is setting value, braking Back pressure is established, and is balanced negative sense loading force, is avoided the hypervelocity phenomenon under Exceed load, and electronic control unit is according to the pressure value of reception Signal, control instruction PID regulations are sent automatically, closed-loop control adjusts the Opening pressure of the second automatic brake valve, so as to further The braking ability of improvement system;
When the first inlet pressure of hydraulic motor is more than pressure preset, now electronic control unit is judged as not going out Existing Exceed load phenomenon, give the second Braking mode valve opening pressure and keep minimum value, the second stop valve is fully opened, now made Dynamic Braking system pressure is zero;
When the left position work of three position four-way directional control valve A, when the right positions of three position four-way directional control valve B work, now hydraulic oil flows through three Position and four-way reversing valve B enters the first oil-feed logical valve control port, closes the first logic inlet valve oil inlet, prevents fluid from falling Stream, now the second oil inlet of hydraulic motor oil-feed, the first oil inlet is fuel-displaced, and now electronic control unit, which sends electric signal, makes second Automatic brake valve is in maximum Opening pressure state, and the first automatic brake valve is in Opening pressure minimum state, the second stop valve Valve port is closed, and the first stop valve fully opens, and hydraulic oil is patrolled from the B mouths outflow in three position four-way directional control valve A by the second oil-feed Volume valve, into the oil inlet of hydraulic motor second, hydraulic oil is discharged from the oil inlet of hydraulic motor first, into the first stop valve, this When because the first Braking mode valve opening pressure is zero, the first stop valve valve port standard-sized sheet, hydraulic oil returns to by the first stop valve Fuel tank;
When hydraulic motor is when the second inlet pressure value is less than pressure preset, now electronic control unit judges occur Exceed load phenomenon, the first automatic brake valve setting electric signal being given, the first cut-off valve opening pressure change is setup pressure value, Brake back pressure to establish, balance negative sense load force, avoid the hypervelocity phenomenon under Exceed load, electronic control unit is according to the pressure of reception Force value signal, sends control instruction PID regulations automatically, and closed-loop control regulation second automatically controls the Opening pressure of braking valve, entered One step improves the braking ability of system;
When the second inlet pressure value of hydraulic motor is more than pressure preset, now electronic control unit judges not go out Existing Exceed load phenomenon, give the first Braking mode valve opening pressure and keep minimum value, the first stop valve is fully opened, now made Dynamic Braking system pressure is zero;
When needing hydraulic motor to keep stationary state, now three position four-way directional control valve B middle positions work, the first oil-feed logic Valve and the second oil-feed logical valve valve port are closed, and hydraulic motor maintains original position not move.
Compared with prior art, the invention has the advantages that:
1st, the oil inlet of two-way hydraulic motor second and the first inlet pressure signal are monitored in real time using pressure sensor, when There is Exceed load phenomenon, when abnormal pressure signal occurs in two-way hydraulic motor oil-feed side, control system immediately believe by output control Number, by controlling brake valve to establish hydraulic system back pressure, balance the load power, and corrects automatic brake valve by feedback device and export Pressure.
2nd, compared with tradition machinery is braked, it is not necessary to which control staff's frequent starting and closing are braked, and it is high-strength to avoid control staff Degree operation, while improve operating efficiency.
3rd, brakes uses closed-loop control, ensures object decrease speed stationarity, prevents using the frequent of mechanical braking Start and stop, and then reduce the impact to hydraulic system and the damage of mechanical structure, ensure the safety and reliability of the course of work.
Brief description of the drawings
Fig. 1 is the hydraulic system principle figure of the present invention;
Fig. 2 is the theory diagram of control unit of the present invention;
Fig. 3 is the logic control flow process figure of control method of the present invention.
Reference:1- three position four-way directional control valves A;2- the first oil-feed logical valves;The stop valves of 3- first;The safety of 4- first Valve;The automatic brake valves of 5- first;6- three position four-way directional control valves B;7- first pressure sensors;8- two-way hydraulic motors;9- second Pressure sensor;The automatic brake valves of 10- second;The safety valves of 11- second;The stop valves of 12- second;13- the second oil-feed logical valves; 14- Braking mode valve groups.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings:
As shown in figure 1, braking control system of the present invention includes three position four-way directional control valve A1, three position four-way directional control valve B6, Braking mode valve group 14 and hydraulic motor 8;
The Braking mode valve group is control valve block, and the valve block includes the first oil-feed logical valve 2, the second oil-feed logical valve 13rd, the first stop valve 3, the second stop valve 12, the first safety valve 4 and the second safety valve 11, the first automatic brake valve 5 and second from Dynamic brake valve 10;The P mouths of the three-position four-way electromagnetic directional valve A are connected with pressure oil, and T mouths are connected with fuel tank, A mouths and The oil inlet of one oil-feed logical valve is connected, and B mouths are connected with the oil inlet of the second oil-feed logical valve;The of the hydraulic motor The oil return opening of one oil inlet and the first oil-feed logical valve, the oil inlet of the first stop valve, the oil inlet of the first safety valve, first are certainly The oil inlet of dynamic brake valve is connected with three position four-way directional control valve B P mouths;Second oil inlet of the hydraulic motor enters with second The oil return opening of oily logical valve, the oil inlet of the second stop valve, the oil inlet of the second safety valve, the oil inlet of the second automatic brake valve It is connected with three position four-way directional control valve B P mouths;The oil return opening of the oil inlet of first stop valve and the first oil-feed logical valve, The oil inlet of first safety valve, the oil inlet of the first automatic brake valve, 3-position 4-way proportional reversing valve B P mouths, hydraulic motor First oil inlet is connected;The oil return opening of first stop valve is connected with oil return opening, the fuel tank of the second stop valve;Described second section Only the oil return opening of the oil inlet of valve and the second oil-feed logical valve, the second safety valve oil inlet, the second automatic brake valve oil-feed Mouth, 3-position 4-way proportional reversing valve B P mouths, the second oil inlet of hydraulic motor are connected;The oil return opening of second stop valve Oil return opening, fuel tank with the first stop valve are connected;The oil return opening of first automatic brake valve and second Braking mode The oil return opening of valve, the oil return opening of the first safety valve, the oil return opening of the second safety valve are connected with fuel tank;The 3-position 4-way ratio Reversal valve B T mouths are connected with fuel tank, and A mouths are connected with the control port of the first oil-feed logical valve, and B mouths are patrolled with the second oil-feed The control port for collecting valve is connected.
As shown in Fig. 2 the braking control system also includes electronic control unit ECU, first pressure sensor 7 and second Pressure sensor 9;The signal output of the electronic control unit input and first pressure sensor and second pressure sensor End is connected, and the electronic control unit output unit controls the first automatic brake valve and the second automatic brake valve;Described first Pressure sensor is connected on the pipeline of the first oil inlet of hydraulic motor, for detecting the pressure of the oil inlet of hydraulic motor first Value, it exports electric signal and is connected with electronic control unit input;The second pressure sensor is connected to hydraulic motor second On the pipeline of oil inlet, for detecting two-way hydraulic motor the second inlet pressure value, it exports electric signal and Electronic Control list First input connection.The electronic control unit (ECU) is that industrial machinery often uses controller, can be with controlling switch valve valve port, its Input gathers first pressure sensor and second pressure sensor signal, by internal processes carry out closed-loop control computing and PID adjusts computing, and operation result is converted into electric signal, controls the first automatic brake valve and the second automatic brake valve.
The three position four-way directional control valve A is solenoid directional control valve, and the hydraulic motor is two-way hydraulic motor, and described first certainly Dynamic brake valve and the second automatic brake valve are electromagnetic proportion relief valve, the Opening pressure of adoption rate magnet control valve;It is described First stop valve, the second stop valve, the first oil-feed logical valve and the second oil-feed logical valve are the inserting stop valve of cover plate;Institute State the inserting overflow valve of the first safety valve and the second safety valve for cover plate.
As shown in figure 3, the control method applied to the braking control system of hydraulic open system is as follows:
The hydraulic fluid port of hydraulic motor first and second are obtained by first pressure sensor and second pressure sensor respectively first The pressure value of hydraulic fluid port;
When the right position work of three position four-way directional control valve A, three position four-way directional control valve B is in middle position, and now hydraulic oil directly flows Oil return box, two-way hydraulic motor are failure to actuate;When three position four-way directional control valve B is in the work of left position, now hydraulic oil flows through three Four-way reversing valve B enters the second oil-feed logical valve control port, closes the second logic inlet valve oil inlet, prevents fluid from falling Stream, now the first oil inlet of hydraulic motor oil-feed, the second oil inlet is fuel-displaced, and now electronic control unit, which sends electric signal, makes first Automatic brake valve is in maximum Opening pressure state, and the second automatic brake valve is in minimum Opening pressure state, the first stop valve Valve port is closed, and the second stop valve fully opens, and hydraulic oil flows out from three position four-way directional control valve A A mouths, by the first oil-feed logic Valve, into the oil inlet of hydraulic motor first, hydraulic oil is discharged from the second oil inlet of hydraulic motor, into the second stop valve, this When because the second Braking mode valve opening pressure is zero, the second stop valve valve port standard-sized sheet, hydraulic oil is returned by the second stop valve Fuel tank;
When hydraulic motor is when the first inlet pressure value is less than pressure preset, now electronic control unit judges occur Exceed load phenomenon, the second automatic brake valve setting electric signal is given, the second cut-off valve opening pressure change is setting value, braking Back pressure is established, and is balanced negative sense loading force, is avoided the hypervelocity phenomenon under Exceed load, and electronic control unit is according to the pressure value of reception Signal, control instruction PID regulations are sent automatically, closed-loop control adjusts the Opening pressure of the second automatic brake valve, so as to further The braking ability of improvement system;
When the first inlet pressure of hydraulic motor is more than pressure preset, now electronic control unit is judged as not going out Existing Exceed load phenomenon, give the second Braking mode valve opening pressure and keep minimum value, the second stop valve is fully opened, now made Dynamic Braking system pressure is zero;
When the left position work of three position four-way directional control valve A, when the right positions of three position four-way directional control valve B work, now hydraulic oil flows through three Position and four-way reversing valve B enters the first oil-feed logical valve control port, closes the first logic inlet valve oil inlet, prevents fluid from falling Stream, now the second oil inlet of hydraulic motor oil-feed, the first oil inlet is fuel-displaced, and now electronic control unit, which sends electric signal, makes second Automatic brake valve is in maximum Opening pressure state, and the first automatic brake valve is in Opening pressure minimum state, the second stop valve Valve port is closed, and the first stop valve fully opens, and hydraulic oil is patrolled from the B mouths outflow in three position four-way directional control valve A by the second oil-feed Volume valve, into the oil inlet of hydraulic motor second, hydraulic oil is discharged from the oil inlet of hydraulic motor first, into the first stop valve, this When because the first Braking mode valve opening pressure is zero, the first stop valve valve port standard-sized sheet, hydraulic oil returns to by the first stop valve Fuel tank;
When hydraulic motor is when the second inlet pressure value is less than pressure preset, now electronic control unit judges occur Exceed load phenomenon, the first automatic brake valve setting electric signal being given, the first cut-off valve opening pressure change is setup pressure value, Brake back pressure to establish, balance negative sense load force, avoid the hypervelocity phenomenon under Exceed load, electronic control unit is according to the pressure of reception Force value signal, sends control instruction PID regulations automatically, and closed-loop control regulation second automatically controls the Opening pressure of braking valve, entered One step improves the braking ability of system;
When the second inlet pressure value of hydraulic motor is more than pressure preset, now electronic control unit judges not go out Existing Exceed load phenomenon, give the Opening pressure of the first automatic brake valve 5 and keep minimum value, the first stop valve fully opens, now Brake system pressure is zero;
When needing hydraulic motor to keep stationary state, now three position four-way directional control valve B middle positions work, the first oil-feed logic Valve and the second oil-feed logical valve valve port are closed, and hydraulic motor maintains original position not move.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.

Claims (4)

  1. A kind of 1. braking control system applied to hydraulic open system, it is characterised in that:The braking control system includes three Position and four-way reversing valve A, three position four-way directional control valve B, Braking mode valve group and hydraulic motor;
    The Braking mode valve group is control valve block, and the valve block includes the first oil-feed logical valve, the second oil-feed logical valve, first Stop valve, the second stop valve, the first safety valve and the second safety valve, the first automatic brake valve and the second automatic brake valve;It is described Three-position four-way electromagnetic directional valve A P mouths are connected with pressure oil, and T mouths are connected with fuel tank, A mouths and the first oil-feed logical valve Oil inlet is connected, and B mouths are connected with the oil inlet of the second oil-feed logical valve;First oil inlet of the hydraulic motor and first The oil-feed of the oil return opening of oil-feed logical valve, the oil inlet of the first stop valve, the oil inlet of the first safety valve, the first automatic brake valve Mouth is connected with three position four-way directional control valve B P mouths;The oil return of second oil inlet of the hydraulic motor and the second oil-feed logical valve Mouth, the oil inlet of the second stop valve, the oil inlet of the second safety valve, the oil inlet of the second automatic brake valve and 3-position 4-way commutation Valve B P mouths are connected;The oil return opening of the oil inlet of first stop valve and the first oil-feed logical valve, the first safety valve enter Hydraulic fluid port, the oil inlet of the first automatic brake valve, 3-position 4-way proportional reversing valve B P mouths, the first oil inlet of hydraulic motor are connected Connect;The oil return opening of first stop valve is connected with oil return opening, the fuel tank of the second stop valve;The oil inlet of second stop valve with The oil return opening of second oil-feed logical valve, the oil inlet of the second safety valve, the oil inlet of the second automatic brake valve, 3-position 4-way ratio Reversal valve B P mouths, the second oil inlet of hydraulic motor are connected;The oil return opening of first automatic brake valve and second automatic The oil return opening of brake valve, the oil return opening of the first safety valve, the oil return opening of the second safety valve are connected with fuel tank;The 3-position 4-way Proportional reversing valve B T mouths are connected with fuel tank, and A mouths are connected with the control port of the first oil-feed logical valve, and B mouths enter with second The control port of oily logical valve is connected.
  2. A kind of 2. braking control system applied to hydraulic open system according to claim 1, it is characterised in that:It is described Braking control system also includes electronic control unit ECU, first pressure sensor and second pressure sensor;The first pressure Sensor is connected on the pipeline of the first oil inlet of hydraulic motor, for detecting the pressure value of the oil inlet of hydraulic motor first, It exports electric signal and is connected with electronic control unit input;The second pressure sensor is connected to the oil-feed of hydraulic motor second On the pipeline of mouth, for detecting two-way hydraulic motor the second inlet pressure value, it exports electric signal and electronic control unit is defeated Enter end connection;The electronic control unit (ECU) is that industrial machinery often uses controller, can be with controlling switch valve valve port, and it is inputted End collection first pressure sensor and second pressure sensor signal, closed-loop control computing and PID are carried out by internal processes Computing is adjusted, operation result is converted into electric signal, controls the first automatic brake valve and the second automatic brake valve.
  3. A kind of 3. braking control system applied to hydraulic open system according to claim 1, it is characterised in that:It is described Three position four-way directional control valve A is solenoid directional control valve, and the hydraulic motor is two-way hydraulic motor, first automatic brake valve and Two automatic brake valves are electromagnetic proportion relief valve, the Opening pressure of adoption rate magnet control valve;First stop valve, Two stop valves, the first oil-feed logical valve and the second oil-feed logical valve are the inserting stop valve of cover plate;First safety valve With the inserting overflow valve that the second safety valve is cover plate.
  4. 4. a kind of control method based on the braking control system for being applied to hydraulic open system described in claim 1, its feature It is, methods described includes following content:
    The hydraulic fluid port of hydraulic motor first and the second hydraulic fluid port are obtained by first pressure sensor and second pressure sensor respectively first Pressure value;
    When the right position work of three position four-way directional control valve A, three position four-way directional control valve B is in middle position, and now hydraulic oil directly flows back to oil Case, two-way hydraulic motor are failure to actuate;When three position four-way directional control valve B is in the work of left position, now hydraulic oil flows through 3-position 4-way Reversal valve B enters the second oil-feed logical valve control port, closes the second logic inlet valve oil inlet, prevents fluid from flowing backwards, this When hydraulic motor the first oil inlet oil-feed, the second oil inlet is fuel-displaced, now electronic control unit send electric signal make it is first automatic Brake valve is in maximum Opening pressure state, and the second automatic brake valve is in minimum Opening pressure state, the first stop valve valve port To close, the second stop valve fully opens, and hydraulic oil flows out from three position four-way directional control valve A A mouths, by the first oil-feed logical valve, Into the oil inlet of hydraulic motor first, hydraulic oil is discharged from the second oil inlet of hydraulic motor, into the second stop valve, now by It is zero in the second Braking mode valve opening pressure, the second stop valve valve port standard-sized sheet, hydraulic oil returns to fuel tank by the second stop valve;
    When hydraulic motor is when the first inlet pressure value is less than pressure preset, now electronic control unit judges to surmount Load phenomena, the second automatic brake valve setting electric signal is given, the second cut-off valve opening pressure change is setting value, brakes back pressure Establish, balance negative sense loading force, avoid the hypervelocity phenomenon under Exceed load, electronic control unit is believed according to the pressure value of reception Number, control instruction PID regulations are sent automatically, and closed-loop control adjusts the Opening pressure of the second automatic brake valve, so as to further change The braking ability of kind system;
    When the first inlet pressure of hydraulic motor is more than pressure preset, now electronic control unit is judged as not surpassing More load phenomena, give the second Braking mode valve opening pressure and keep minimum value, the second stop valve fully opens, now braking system Controlling dynamic pressure is zero;
    When the left position work of three position four-way directional control valve A, when the right positions of three position four-way directional control valve B work, now hydraulic oil flows through three four Logical reversal valve B enters the first oil-feed logical valve control port, closes the first logic inlet valve oil inlet, prevents fluid from flowing backwards, Now the second oil inlet of hydraulic motor oil-feed, the first oil inlet is fuel-displaced, and now electronic control unit, which sends electric signal, makes second certainly Dynamic brake valve is in maximum Opening pressure state, and the first automatic brake valve is in Opening pressure minimum state, the second stop valve valve Mouth is closed, and the first stop valve fully opens, and hydraulic oil is from the B mouths outflow in three position four-way directional control valve A, by the second oil-feed logic Valve, into the oil inlet of hydraulic motor second, hydraulic oil is discharged from the oil inlet of hydraulic motor first, into the first stop valve, now Because the first Braking mode valve opening pressure is zero, the first stop valve valve port standard-sized sheet, hydraulic oil returns to oil by the first stop valve Case;
    When hydraulic motor is when the second inlet pressure value is less than pressure preset, now electronic control unit judges to surmount Load phenomena, the first automatic brake valve setting electric signal is given, the first cut-off valve opening pressure change is setup pressure value, braking Back pressure is established, and is balanced negative sense load force, is avoided the hypervelocity phenomenon under Exceed load, and electronic control unit is according to the pressure value of reception Signal, control instruction PID regulations are sent automatically, closed-loop control regulation second automatically controls the Opening pressure of braking valve, further The braking ability of improvement system;
    When the second inlet pressure value of hydraulic motor is more than pressure preset, now electronic control unit judges not surpass More load phenomena, give the Opening pressure of the first automatic brake valve 5 and keep minimum value, the first stop valve is fully opened, now braked Braking system pressure is zero;
    When need hydraulic motor keep stationary state when, now three position four-way directional control valve B middle positions work, the first oil-feed logical valve and Second oil-feed logical valve valve port is closed, and hydraulic motor maintains original position not move.
CN201711083215.4A 2017-11-07 2017-11-07 A kind of braking control system and control method applied to hydraulic open system Pending CN107676316A (en)

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JPH08324977A (en) * 1995-05-31 1996-12-10 Hitachi Constr Mach Co Ltd Hydraulic circuit for winch
JPH09273503A (en) * 1996-04-02 1997-10-21 Kayaba Ind Co Ltd Fluid pressure control device
DE19713592A1 (en) * 1997-04-02 1998-10-08 Delmag Maschinenfabrik Hydraulic winch with hydraulic motor
US5947140A (en) * 1997-04-25 1999-09-07 Caterpillar Inc. System and method for controlling an independent metering valve
CN102216532A (en) * 2008-11-19 2011-10-12 斗山英维高株式会社 Boom cylinder control circuit for construction machine
CN202441660U (en) * 2012-02-21 2012-09-19 湖南华鼎建筑科技有限公司 Backpressure loop of bridge synchronous jacking hydraulic system
CN203128081U (en) * 2013-03-27 2013-08-14 中联重科股份有限公司 Hydraulic control system for suspension arm, and crane
CN203926185U (en) * 2014-07-14 2014-11-05 湘潭市恒欣实业有限公司 Fluid pressure drive device parking device
CN104214157A (en) * 2014-08-26 2014-12-17 武汉船用机械有限责任公司 Electrohydraulic control reserving valve and electrohydraulic control system
CN104265704A (en) * 2014-09-18 2015-01-07 芜湖高昌液压机电技术有限公司 Lifting machine backpressure regulating loop
CN204400467U (en) * 2014-11-24 2015-06-17 徐州重型机械有限公司 Crane hoisting energy regenerating and reutilization system and hoisting crane
CN105605001A (en) * 2016-03-17 2016-05-25 上海振华重工(集团)股份有限公司 Hydraulic safety valve set for closed winch

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08324977A (en) * 1995-05-31 1996-12-10 Hitachi Constr Mach Co Ltd Hydraulic circuit for winch
JPH09273503A (en) * 1996-04-02 1997-10-21 Kayaba Ind Co Ltd Fluid pressure control device
DE19713592A1 (en) * 1997-04-02 1998-10-08 Delmag Maschinenfabrik Hydraulic winch with hydraulic motor
US5947140A (en) * 1997-04-25 1999-09-07 Caterpillar Inc. System and method for controlling an independent metering valve
CN102216532A (en) * 2008-11-19 2011-10-12 斗山英维高株式会社 Boom cylinder control circuit for construction machine
CN202441660U (en) * 2012-02-21 2012-09-19 湖南华鼎建筑科技有限公司 Backpressure loop of bridge synchronous jacking hydraulic system
CN203128081U (en) * 2013-03-27 2013-08-14 中联重科股份有限公司 Hydraulic control system for suspension arm, and crane
CN203926185U (en) * 2014-07-14 2014-11-05 湘潭市恒欣实业有限公司 Fluid pressure drive device parking device
CN104214157A (en) * 2014-08-26 2014-12-17 武汉船用机械有限责任公司 Electrohydraulic control reserving valve and electrohydraulic control system
CN104265704A (en) * 2014-09-18 2015-01-07 芜湖高昌液压机电技术有限公司 Lifting machine backpressure regulating loop
CN204400467U (en) * 2014-11-24 2015-06-17 徐州重型机械有限公司 Crane hoisting energy regenerating and reutilization system and hoisting crane
CN105605001A (en) * 2016-03-17 2016-05-25 上海振华重工(集团)股份有限公司 Hydraulic safety valve set for closed winch

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