CN106088208B - Excavator turns round hydraulic control system - Google Patents

Excavator turns round hydraulic control system Download PDF

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Publication number
CN106088208B
CN106088208B CN201610454932.2A CN201610454932A CN106088208B CN 106088208 B CN106088208 B CN 106088208B CN 201610454932 A CN201610454932 A CN 201610454932A CN 106088208 B CN106088208 B CN 106088208B
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China
Prior art keywords
main pump
valve
way electromagnetic
electromagnetic directional
directional valve
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CN201610454932.2A
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CN106088208A (en
Inventor
李文新
刘建
王茄任
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Guangxi Liugong Machinery Co Ltd
Liugong Changzhou Machinery Co Ltd
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Guangxi Liugong Machinery Co Ltd
Liugong Changzhou Machinery Co Ltd
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Priority to CN201610454932.2A priority Critical patent/CN106088208B/en
Publication of CN106088208A publication Critical patent/CN106088208A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2217Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/225Control of steering, e.g. for hydraulic motors driving the vehicle tracks

Abstract

The present invention relates to excavators to turn round hydraulic control system, to solve the problems, such as that existing hydraulic crawler excavator has energy spill losses during swing starting;A kind of excavator revolution hydraulic control system, including rotary motor assembly, main pump, the first three-position four-way electromagnetic directional valve, main pump proportion magnetic valve, main pump pressure sensor, pilot handle, controller are provided;The pumping hole of main pump is connect with the P of the first three-position four-way electromagnetic directional valve mouths, and the A mouths of the first three-position four-way electromagnetic directional valve, B mouthfuls of correspondences are connect with the A of rotary motor assembly mouths, B mouthfuls;The input terminal connection of the control output end, main pump pressure sensor and controller of pilot handle, the magnet control input terminal of the first three-position four-way electromagnetic directional valve and the output end of controller connect.It is few that there is the present invention element to increase, and technology is more ripe, of low cost to be combined with electric-control system, controls flexibility and reliability;The advantages that capacity usage ratio is high, reduces and starts spill losses, and energy-saving effect is apparent.

Description

Excavator turns round hydraulic control system
Technical field
The present invention relates to a kind of hydraulic control systems, and hydraulic control system is turned round more specifically to a kind of excavator.
Background technology
The operating mode that hydraulic crawler excavator most often carries out is to excavate entrucking, and each excacation cycle can undergo revolution twice and open Dynamic and rotary braking process.Overflowing by rotary motor actuator port when rotary braking in most common excavator rotary system It flows valve overflow and generates reactive torque, so that revolution is slowed down until stopping.During this braking, hydraulic oil overflows through overflow valve Stream, generates a large amount of heat, that is, the kinetic energy turned round is converted into the thermal energy of hydraulic oil and is consumed.And turn round in start-up course, it opens The rotary torque that the dynamic starting stage needs is very big, and revolution overflow valve can equally reach oil pressure relief, when rotational speed reaches maximum Operating pressure is turned round after speed can just decline, but general excavation entrucking operating mode revolution is not up to maximum speed, that is, turns round Startup equally exists larger spill losses.
In patent at this stage in relation to recycling rotary braking energy, rotary braking energy is only recycled, to reach Energy-efficient purpose, but in conversion process of energy, Brake Energy can not be recovered completely, recycling can not be fully utilized when starting in revolution Brake Energy, thus also need to original machine provide small part energy, equally there are still spill losses, this part overflows on startup Loss is equally wasted in the form of thermal energy, if it is possible to be eliminated this part spill losses, will be further saved energy consumption.
Invention content
The technical problem to be solved by the present invention is to be directed to existing hydraulic crawler excavator to have energy overflow damage during swing starting The problem of mistake, and a kind of excavator revolution hydraulic pressure for having energy regenerating and capable of reducing energy spill losses when revolution starts is provided Control system.
The present invention is to realize that the technical solution of its purpose is such:A kind of excavator revolution hydraulic control system is provided, Including rotary motor assembly, main pump;Characterized by further comprising the first three-position four-way electromagnetic directional valve, the masters of control main pump flow Pump proportion magnetic valve, main pump pressure sensor, pilot handle, controller for detecting main pump pump intake pressure;The main pump Pumping hole is connect with the P mouths of first three-position four-way electromagnetic directional valve, A mouths of first three-position four-way electromagnetic directional valve, B mouthfuls Correspondence is connect with the A mouths of the rotary motor assembly, B mouthfuls;The control output end of the pilot handle, main pump pressure sensor with The input terminal of the controller connects, magnet control input terminal and the control of first three-position four-way electromagnetic directional valve The output end of device connects.
It is turned round in hydraulic control system in above-mentioned excavator, further includes rotation energy recovery system, the rotation energy returns Receipts system include accumulator, shuttle valve, the second three-position four-way electromagnetic directional valve, the first two-position two-way electromagnetic directional valve, the two or two Two electric change valves, the energy storage pressure sensor for detecting energy storage pressure;Two oil inlets of the shuttle valve correspond to The A mouths of rotary motor assembly, B mouthfuls of connections, the outlet of shuttle valve is successively through the first two-position two-way electromagnetic directional valve, the second bi-bit bi-pass Solenoid directional control valve is connect with accumulator;The A mouths of second three-position four-way electromagnetic directional valve, B mouthfuls of correspondences and rotary motor assembly A mouths, B mouthfuls of connections, the P mouths of second three-position four-way electromagnetic directional valve are connected to the first two-position two-way electromagnetic directional valve, the Between two two-position two-way electromagnetic directional valves;Second three-position four-way electromagnetic directional valve, the first two-position two-way electromagnetic directional valve, Each magnet control input terminal of two two-position two-way electromagnetic directional valves is connect with the output end of the controller;The accumulator pressure Force snesor is connect with the control signal of the controller.
It is turned round in hydraulic control system in above-mentioned excavator, the connection of the P mouths of second three-position four-way electromagnetic directional valve The check valve to the P mouth one-way conductions of the second three-position four-way electromagnetic directional valve is provided on oil circuit.
It is turned round in hydraulic control system in above-mentioned excavator, is driven and turned round through the first three-position four-way electromagnetic directional valve by main pump Motor assembly and when main pump pump intake pressure is more than the first preset value, the controller is by main pump proportion magnetic valve by the master The discharge capacity of pump is reduced to flow needed for hydraulic motor, and the controller is logical when main pump pump intake pressure drops to the second preset value Cross the delivery work of main pump described in main pump proportional solenoid valve control.
Compared with prior art, the present invention there is the present invention element to increase less, technology is more ripe, of low cost and automatically controlled system System combines, and controls flexibility and reliability;The advantages that capacity usage ratio is high, reduces and starts spill losses, and energy-saving effect is apparent.
Description of the drawings
Fig. 1 is the schematic diagram of excavator revolution hydraulic control system of the present invention.
Parts title and serial number in figure:
Control in Hydraulic Rotation System 1, rotation energy recovery system 2, hand guide handle 3, controller 4, rotary motor assembly 11, first Three-position four-way electromagnetic directional valve 12, main pump 13, rotary motor 111, the first overflow valve 112, the second overflow valve 113, main pump pressure Sensor 131, main pump proportion magnetic valve 132, the first two-position two-way electromagnetic directional valve 21, check valve 22, the second 3-position 4-way electricity Magnetic reversal valve 23, shuttle valve 24, accumulator 25, pressure sensor 26, the second two-position two-way electromagnetic directional valve 27.
Specific implementation mode
Illustrate specific embodiment below in conjunction with the accompanying drawings.
Excavator revolution hydraulic control system in the present invention is as shown in Figure 1 comprising Control in Hydraulic Rotation System 1 and revolution energy Measure recovery system 2, Control in Hydraulic Rotation System 1 include rotary motor assembly 11, main pump 13, the first three-position four-way electromagnetic directional valve 12, Main pump proportion magnetic valve 132, main pump pressure sensor 131, pilot handle 3, controller 4;
Main pump pressure sensor 131 is provided on the pumping hole output circuit of main pump 13, the pumping hole pressure for detecting main pump 13 Power.
Main pump proportion magnetic valve 132 is set in main pump 13, and effect is the output flow of adjusting control main pump 13.
The pumping hole of main pump 13 is connect with the P mouths of the first three-position four-way electromagnetic directional valve 12, the first 3-position 4-way electromagnetic switch The T mouths of valve 12 are connected with hydraulic tank.
The A mouths of first three-position four-way electromagnetic directional valve 12, B mouthfuls of correspondences are connect with the A of rotary motor assembly 11 mouths, B mouthfuls;
Rotary motor assembly 11 includes rotary motor 111, the first overflow valve 112, the second overflow valve 113, rotary motor 111 A mouths and B mouthfuls respectively by the road correspondence connect with the A of rotary motor assembly 11 mouths, B mouthfuls, the oil inlet of the first overflow valve 112 and The A mouths of rotary motor 111 connect, and the oil inlet of the second overflow valve 113 is connect with the B of rotary motor 111 mouths;First overflow valve 112 and second overflow valve 113 oil outlet parallel connection after the oil return opening through rotary motor assembly 11 connect with fuel tank circuit.One or three When position four-way electromagnetic reversing valve is in left position or right position, the hydraulic oil of main pump discharge drives rotary motor forward or reverse.
Rotation energy recovery system 2 includes accumulator 25, shuttle valve 24, the second three-position four-way electromagnetic directional valve the 23, the 1st Two electric change valves 21 of position, the second two-position two-way electromagnetic directional valve 27, energy storage pressure sensor 26.Energy storage pressure senses Device 26 is used to detect the pressure of accumulator 25.
A mouthfuls and B mouthfuls correspondences of two oil inlets of shuttle valve 24 are connect with the A of rotary motor assembly 11 mouths, B mouthfuls, and shuttle valve 24 goes out Mouthful (C mouthful) are connect with the P mouths of the first two-position two-way electromagnetic directional valve 21, the T mouths of the first two-position two-way electromagnetic directional valve 21 and the The P mouths of two two-position two-way electromagnetic directional valves 27 connect, and the T mouths of the second two-position two-way electromagnetic directional valve 27 are connect with accumulator 25.
The A mouths of second three-position four-way electromagnetic directional valve 23, B mouthfuls of correspondences are connect with the A of rotary motor assembly 11 mouths, B mouthfuls, the The P mouths of two three-position four-way electromagnetic directional valves 23 connect check valve 22, P of the check valve 22 to the second three-position four-way electromagnetic directional valve 23 Mouth direction one-way conduction;The oil inlet of check valve 22 is connected to the first two-position two-way electromagnetic directional valve 21, the second bi-bit bi-pass electricity Between magnetic reversal valve 27, namely it connect with the P mouths of the second two-position two-way electromagnetic directional valve 27.When the second 3-position 4-way electromagnetic switch When valve 23 is in left position or right position and the second two-position two-way electromagnetic directional valve 27 in the conduction state, high pressure that accumulator 25 exports Hydraulic oil, to rotary motor assembly fuel feeding, makes its rotation through the second three-position four-way electromagnetic directional valve 23.
Electric signal control output end, main pump pressure sensor 131, energy storage pressure sensor 26 and the control of pilot handle 3 The input terminal of device 4 processed connects, the first three-position four-way electromagnetic directional valve 12, the second three-position four-way electromagnetic directional valve 23, the 1st Two electric change valves 21, the second two-position two-way electromagnetic directional valve 27 each magnet control input terminal and controller 4 output End connection.
The excavator revolution hydraulic control system course of work in the present embodiment is as follows:
When rotary motor 111 runs well, it is assumed that fluid is flowed by A mouths of rotary motor 111, then is flowed out through the by B mouthfuls One three-position four-way electromagnetic directional valve 12 flows back to hydraulic oil container, and when the swing operation is stopped, i.e. 3 no pressure signal of hand guide handle is defeated Go out, controller 4 sends out control signal to the first three-position four-way electromagnetic directional valve 12 and is returned to middle position;To main pump proportion magnetic valve 132 send out control signal, so that it is controlled 13 discharge capacity of main pump minimum;Control signal is sent out to the first two-position two-way electromagnetic directional valve 21 Be at bottom, i.e., it is in the conduction state;Control signal is sent out to the second two-position two-way electromagnetic directional valve 27 to be at down Position is conducting state.Simultaneously because inertia, rotation continues to be maintained in the original direction for revolution, from B mouthfuls of outflow high-voltage oil liquids of rotary motor, oil B oil inlet of the liquid through shuttle valve 24 flows into, the outflow of C oil outlets, then through the first two-position two-way electromagnetic directional valve 21, the second bi-bit bi-pass Solenoid directional control valve 27 flows into accumulator 25, and revolution stops accumulator 25 and completes energy regenerating.
When operated pilot handle 3 drives rotary system, whether controller 4 judges accumulator 25 by pressure sensor 26 Fluid can be exported, if can be with, controller 4 be to the first two-position two-way electromagnetic directional valve 21, the second two-position two-way electromagnetic directional valve 27, which send out control signal, makes the first two-position two-way electromagnetic directional valve 21 reset, that is, is in by state, the second bi-bit bi-pass electromagnetism Reversal valve 27 is in bottom, i.e., in the conduction state;Sending out control signal to the second three-position four-way electromagnetic directional valve 23 makes at its In left position or right position;Fluid is flowed out through accumulator 25, then through the first two-position two-way electromagnetic directional valve 21, the second bi-bit bi-pass electromagnetism Reversal valve 27 and the second three-position four-way electromagnetic directional valve 23 flow into the A mouths of rotary motor 111 or B mouthfuls of driving rotary motors 111 open It is dynamic.
In the process, controller 4 detects the pressure of energy storage pressure sensor 26, if pressure is less than setting value, control Device sends out control signal to the first two-position two-way electromagnetic directional valve 21, the second two-position two-way electromagnetic directional valve 27 makes the two be in It is upper, that is, it is in by state, is sent out during control signal makes its reset be in the second three-position four-way electromagnetic directional valve 23 Position, rotation energy recovery system 2 no longer works at this time.Controller 4 sends out control to the first three-position four-way electromagnetic directional valve 12 Signal is at left position or right position, continues to provide fluid for system.Controller 4 is according to main pump pressure sensor 131 simultaneously Pressure signal judges whether rotary motor reaches oil pressure relief namely whether main pump pump intake pressure reaches the first preset value (usually For the overflow value of rotary motor).If the detection pressure of pressure sensor 131 reaches the first preset value, controller 4 is to main pump ratio Solenoid valve 132 sends out control signal, so that it is controlled main pump 13 and reduces discharge capacity, that is, reaches fluid " required and gained ", main pump is made to carry For fluid needed for rotary motor, the spill losses that rotary motor starts is eliminated.Wherein flow needed for rotary motor is to pass through control What device was calculated, then real-time control discharge of main pump matches flow needed for rotary motor, and the discharge capacity of rotary motor is fixed , pressure sensor acquisition pressure can show that rotary motor torque, the rotary inertia of rotary system are also known in turn, so Afterwards it is known that the revolution acceleration of rotary system, controller also detect the pilot signal of pilot handle 3, operate revolution when Between be just to determine.As above rotary motor rotating speed can be obtained, the product for turning round rotating speed and discharge capacity is exactly to turn round flow.Work as main pump When 13 pressure drop to the second preset value, rotary motor 111 reaches maximum speed, and controller passes through main pump proportion magnetic valve 132 Restore main pump delivery fuel feeding.Second preset value can be set according to the parameter of machine, which is that hydraulic motor is in most Steady pressure when high rotating speed.If 131 pressure of pressure sensor does not reach oil pressure relief, controller 4 is not controlled main pump 13 System, main pump normally provide fluid for rotary motor.

Claims (3)

1. a kind of excavator turns round hydraulic control system, including rotary motor assembly, main pump;Characterized by further comprising the one or three Position four-way electromagnetic reversing valve, the main pump proportion magnetic valve for controlling main pump flow, the main pump pressure for detecting main pump pump intake pressure Sensor, pilot handle, controller, rotation energy recovery system;The pumping hole of the main pump and the first 3-position 4-way electromagnetism The P mouths of reversal valve connect, the A mouths of first three-position four-way electromagnetic directional valve, B mouthfuls of correspondences and the rotary motor assembly A Mouth, B mouthfuls of connections;The control output end of the pilot handle, main pump pressure sensor are connect with the input terminal of the controller, institute The magnet control input terminal for stating the first three-position four-way electromagnetic directional valve is connect with the output end of the controller;The revolution energy It includes accumulator, shuttle valve, the second three-position four-way electromagnetic directional valve, the first two-position two-way electromagnetic directional valve, second to measure recovery system Two-position two-way electromagnetic directional valve, the energy storage pressure sensor for detecting energy storage pressure;Two oil inlets pair of the shuttle valve Should be connect with the A of rotary motor assembly mouths, B mouthfuls, the outlet of shuttle valve successively through the first two-position two-way electromagnetic directional valve, the two or two Two electric change valves are connect with accumulator;The A mouths of second three-position four-way electromagnetic directional valve, B mouthfuls of correspondences and rotary motor The A mouths of assembly, B mouthfuls of connections, the P mouths of second three-position four-way electromagnetic directional valve are connected to the first bi-bit bi-pass electromagnetic switch Between valve, the second two-position two-way electromagnetic directional valve;Second three-position four-way electromagnetic directional valve, the first bi-bit bi-pass electromagnetic switch Valve, the second two-position two-way electromagnetic directional valve each magnet control input terminal connect with the output end of the controller;The storage Energy device pressure sensor is connect with the control signal of the controller.
2. excavator according to claim 1 turns round hydraulic control system, it is characterised in that the second 3-position 4-way electricity The check valve to the P mouth one-way conductions of the second three-position four-way electromagnetic directional valve is provided on the connection oil circuit of the P mouths of magnetic reversal valve.
3. excavator according to any one of claim 1 to 2 turns round hydraulic control system, it is characterised in that passed through by main pump First three-position four-way electromagnetic directional valve drives rotary motor assembly and when main pump pump intake pressure is more than the first preset value, the control The discharge capacity of the main pump is reduced to flow needed for hydraulic motor by device processed by main pump proportion magnetic valve, and in main pump pump intake pressure Controller when the second preset value is dropped to work by the delivery of main pump described in main pump proportional solenoid valve control.
CN201610454932.2A 2016-06-21 2016-06-21 Excavator turns round hydraulic control system Active CN106088208B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106869223B (en) * 2017-02-15 2019-02-19 广西柳工机械股份有限公司 The control method of excavator positive-flow hydraulic system
CN108643276A (en) * 2018-06-06 2018-10-12 马鞍山松鹤信息科技有限公司 A kind of energy saving excavator with energy-recuperation system
CN108915021B (en) * 2018-07-27 2021-02-05 徐州工业职业技术学院 Multi-mode rotary electrohydraulic control system for hydraulic excavator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10183689A (en) * 1996-12-25 1998-07-14 Shin Caterpillar Mitsubishi Ltd Hydraulic control device
CN102979133A (en) * 2012-11-26 2013-03-20 柳州柳工挖掘机有限公司 Rotary brake energy recycling device of hydraulic excavator
CN203452118U (en) * 2013-08-30 2014-02-26 华南理工大学 Hydraulic rotation energy-saving system for excavator
CN103628512A (en) * 2013-11-15 2014-03-12 中外合资沃得重工(中国)有限公司 Rotary hydraulic control device of excavator movable arm platform and control method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9951498B2 (en) * 2016-01-25 2018-04-24 Caterpillar Inc. Regenerative machine coupling system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10183689A (en) * 1996-12-25 1998-07-14 Shin Caterpillar Mitsubishi Ltd Hydraulic control device
CN102979133A (en) * 2012-11-26 2013-03-20 柳州柳工挖掘机有限公司 Rotary brake energy recycling device of hydraulic excavator
CN203452118U (en) * 2013-08-30 2014-02-26 华南理工大学 Hydraulic rotation energy-saving system for excavator
CN103628512A (en) * 2013-11-15 2014-03-12 中外合资沃得重工(中国)有限公司 Rotary hydraulic control device of excavator movable arm platform and control method

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