CN107269603B - Lifting hydraulic system is forbidden in the walking of lift truck - Google Patents

Lifting hydraulic system is forbidden in the walking of lift truck Download PDF

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Publication number
CN107269603B
CN107269603B CN201710529636.9A CN201710529636A CN107269603B CN 107269603 B CN107269603 B CN 107269603B CN 201710529636 A CN201710529636 A CN 201710529636A CN 107269603 B CN107269603 B CN 107269603B
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valve
mouthfuls
hydraulic
pressure
mouth
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CN201710529636.9A
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CN107269603A (en
Inventor
刘剑
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Yancheng Xiongying Precision Machinery Co Ltd
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Yancheng Xiongying Precision Machinery Co Ltd
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Classifications

    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60PVEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P1/00Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
    • B60P1/02Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with parallel up-and-down movement of load supporting or containing element
    • 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
    • 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
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/041Removal or measurement of solid or liquid contamination, e.g. filtering
    • 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
    • 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
    • F15B2211/60Circuit components or control therefor
    • F15B2211/615Filtering means

Abstract

Lifting hydraulic system, including fuel tank, hydraulic pump, Manual hydraulic change-over valve, elevating ram, gear-selecting cylinder, manual pneumatic reversal valve, gas bag, block selecting operation valve, Pneumatic hydraulic reversal valve, shuttle valve, dual-pressure valve, pressure sensor, electromagnetism gas pressure change valve and master controller are forbidden in a kind of walking of lift truck;The execution mouth of Manual hydraulic change-over valve is connected to the oil inlet of Pneumatic hydraulic reversal valve, the execution mouth and pressure sensor of Pneumatic hydraulic reversal valve are connected to the rodless cavity of elevating ram, the rodless cavity of gear-selecting cylinder is connected to the first air inlet of shuttle valve, the rod chamber of gear-selecting cylinder is connected to the second air inlet of shuttle valve, and the gas outlet of shuttle valve is connected to the second air inlet of dual-pressure valve;The execution mouth of electromagnetism gas pressure change valve is connected to the first air inlet of dual-pressure valve, and the gas outlet of dual-pressure valve is connected to the control mouth of Pneumatic hydraulic reversal valve;Solenoid valve and pressure sensor are electrically connected with master controller.Operation is very easy, accident is less likely to occur by the present invention.

Description

Lifting hydraulic system is forbidden in the walking of lift truck
Technical field
The present invention relates to a kind of vehicles, and in particular to lifting hydraulic system is forbidden in a kind of walking of lift truck.
Background technology
Lift truck is generally used to carry out high-altitude installation exercise, as shown in Fig. 2, lift truck includes vehicle frame 100, elevating mechanism 101, elevating ram 5, compartment 102;The cylinder body 5-1 of elevating ram 5 is hinged on vehicle frame 100, the piston rod 5-2 of elevating ram 5 It is hinged on elevating mechanism 101, compartment 102 is fixedly connected on elevating mechanism 101, as shown in Figure 3 and Figure 4, when lift truck is opened To after operating location, manual pneumatic reversal valve 7 is first operated, make P mouthfuls of 7 air inlet of manual pneumatic reversal valve and executes mouth A and execution Mouthfuls B mouthfuls are not communicated with, the pressed gas in gas bag 12 can neither be reached after manual pneumatic reversal valve 7 gear-selecting cylinder 6 without bar Chamber can not reach the rod chamber of gear-selecting cylinder 6 after manual pneumatic reversal valve 7, block selecting operation valve 14 is made to hang in neutral gear;So Manual hydraulic change-over valve 3 is operated afterwards, and 3 oil inlet P mouth of Manual hydraulic change-over valve is made to be communicated for mouth A mouthfuls with execution, what hydraulic pump 2 exported Pressure oil enters the rodless cavity of elevating ram 5, drives elevating mechanism 101 by elevating ram 5 and compartment 102 is driven to lift, work as vehicle When operation height is lifted in compartment 102, Manual hydraulic change-over valve 3 is operated, A mouthfuls of execution mouth and the oil inlet of Manual hydraulic change-over valve 3 are made P mouthfuls of mouth and fuel tank 1 are obstructed, and installation personnel carries out installation exercise in the compartment 102 after lifting, after the completion of installation exercise, Manual hydraulic change-over valve 3 is first operated, 3 oil inlet P mouth of Manual hydraulic change-over valve is made to be communicated for mouth B mouthfuls with execution, what hydraulic pump 2 exported Pressure oil enters the rod chamber of elevating ram 5, drives elevating mechanism 101 by elevating ram 5 and compartment 102 is driven to fall, then It walks after lift truck is put into gear by driver, still in lifting state, driver just will in practice it some times happens that compartment 102 Lift truck starts to walk after putting into gear, and at this moment when by a lower height of place is easy to that accident occurs.Chinese patent literature CN 104819177 A(Application number 201510135096.7)It discloses a kind of lifting of mine car and forbids vibration hydraulic system, can make The still vehicle in the state of lifting of compartment 12 cannot put into gear walking, but the lifting of this mine car forbids vibration hydraulic system can not Compartment 12 is put down automatically after realizing vehicle to run, also needs again may be used after making compartment 12 put down by manual operation hand-operated direction valve 3 With walking of putting into gear, therefore operate very inconvenient.And it can make when accidentallyying run into hand-operated direction valve 3 when driving mining The compartment 12 of vehicle lifts, and at this moment when by a lower height of place is easy to that accident occurs.
Invention content
The object of the present invention is to provide a kind of walkings for the lift truck that operation is very easy, accident is less likely to occur to forbid lifting Rise hydraulic system.
To achieve the goals above, the technical scheme is that:Lifting hydraulic system is forbidden in a kind of walking of lift truck, It is grasped including fuel tank, hydraulic pump, Manual hydraulic change-over valve, elevating ram, gear-selecting cylinder, manual pneumatic reversal valve, gas bag and block selecting Make valve;Further include Pneumatic hydraulic reversal valve, shuttle valve, dual-pressure valve, pressure sensor, electromagnetism gas pressure change valve and master controller;Institute The oil inlet for stating hydraulic pump is connected to fuel tank, and the oil outlet of hydraulic pump is connected to the oil inlet P mouth of Manual hydraulic change-over valve, manually B mouthfuls of the execution mouth of hydraulicdirectional control valve is connected to the rod chamber of elevating ram, A mouthfuls of the execution mouth of Manual hydraulic change-over valve and Pneumatic Liquid The oil inlet P mouth connection of reversal valve, the oil return inlet T mouth of Manual hydraulic change-over valve is pressed to be connected to fuel tank;The Pneumatic hydraulic commutation A mouthfuls of the execution mouth of valve is connected to the rodless cavity of elevating ram, and the oil return inlet T mouth of Pneumatic hydraulic reversal valve is connected to fuel tank;It is described P mouthfuls of the air inlet of manual pneumatic reversal valve is connected to gas bag, and A mouthfuls of the execution mouth of manual pneumatic reversal valve is with gear-selecting cylinder without bar Chamber is connected to, and the rodless cavity of gear-selecting cylinder is connected to A mouthful of the first air inlet of shuttle valve, B mouthfuls of the execution mouth of manual pneumatic reversal valve and The rod chamber of gear-selecting cylinder is connected to, and the rod chamber of gear-selecting cylinder is connected to C mouthfuls of the second air inlet of shuttle valve, manual pneumatic reversal valve Gas outlet T mouthfuls and atmosphere;The piston rod of the gear-selecting cylinder is fixedly connected with the operating lever of gear selecting operation valve;The shuttle Gas outlet B mouthfuls of valve is connected to P2 mouthfuls of the second air inlet of dual-pressure valve;P mouthfuls of the air inlet of the electromagnetism gas pressure change valve and gas bag Connection, A mouthfuls of the execution mouth of electromagnetism gas pressure change valve are connected to P1 mouthfuls of the first air inlet of dual-pressure valve, and electromagnetism gas pressure change valve goes out T mouthfuls of gas port is communicated with air, and the terminals K of electromagnetism gas pressure change valve is electrically connected with master controller;The gas outlet A of the dual-pressure valve Mouth is connected to K mouthfuls of the control mouth of Pneumatic hydraulic reversal valve;The pressure sensor is connected to the rodless cavity of elevating ram, and pressure Sensor is electrically connected with master controller, when the pressure of pressure sensor reaches setting value, by main controller controls electromagnetism air pressure The terminals K of reversal valve obtains electric, while the timer in master controller starts timing, when reaching setting value when timer, By the terminals K dead electricity of main controller controls electromagnetism gas pressure change valve.
The oil inlet of the hydraulic pump to the oily channel of fuel tank is equipped with filter.
The oil outlet of the hydraulic pump to the oily channel of fuel tank is equipped with safety valve.
Benefit of the invention is that:1), since the invention also includes Pneumatic hydraulic reversal valve, shuttle valve, dual-pressure valve, pressure sensings Device, electromagnetism gas pressure change valve and master controller;The oil inlet for executing A mouthfuls of mouth and Pneumatic hydraulic reversal valve of Manual hydraulic change-over valve P mouthfuls of connections, A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve are connected to the rodless cavity of elevating ram, the rodless cavity and shuttle of gear-selecting cylinder A mouthfuls of connections of the first air inlet of valve, the rod chamber of gear-selecting cylinder are connected to C mouthfuls of the second air inlet of shuttle valve, the gas outlet B of shuttle valve Mouth is connected to P2 mouthfuls of the second air inlet of dual-pressure valve;P mouthfuls of the air inlet of electromagnetism gas pressure change valve is connected to gas bag, and electromagnetism air pressure is changed It is connected to A mouthfuls of the execution mouth of valve with P1 mouthfuls of the first air inlet of dual-pressure valve, the terminals K and master controller of electromagnetism gas pressure change valve Electrical connection;Gas outlet A mouthfuls of dual-pressure valve with the control mouth of Pneumatic hydraulic reversal valve K mouthfuls be connected to;Pressure sensor and elevating ram Rodless cavity connection, and pressure sensor is electrically connected with master controller, when the pressure of pressure sensor arrival setting value, by leading The terminals K of controller control electromagnetism gas pressure change valve obtains electric, while the timer in master controller starts timing, works as timer When timing reaches setting value, by the terminals K dead electricity of main controller controls electromagnetism gas pressure change valve.Thus when compartment is still lifting State, driver start to walk after just lift truck is put into gear, and the oil of the rodless cavity of elevating ram cannot pass through hand-hydraulic commutation Valve enters fuel tank, to make the oil of the rodless cavity of elevating ram that there is pressure, when the pressure of pressure sensor reaches setting value, Electric, P mouthfuls of the air inlet of electromagnetism gas pressure change valve and execution mouth A are obtained by the terminals K of main controller controls electromagnetism gas pressure change valve Mouth communicates, and the pressed gas in gas bag passes through A mouthfuls of the first air inlet P1 for entering dual-pressure valve of execution mouth of electromagnetism gas pressure change valve Mouthful;The pressed gas in gas bag enters A mouthfuls of the first air inlet or the second air inlet C of shuttle valve through manual pneumatic reversal valve simultaneously Mouthful, then after P2 mouthfuls of the second air inlet of gas outlet B mouthfuls of arrival dual-pressure valve of shuttle valve 10, so that pressed gas is entered Pneumatic hydraulic and change To K mouthfuls of the control mouth of valve, A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve is communicated with fuel tank, the pressure oil of the rodless cavity of elevating ram Enter fuel tank after Pneumatic hydraulic reversal valve, by elevating ram drive elevating mechanism and with motor-car under the action of the gravity in compartment Compartment falls, i.e., compartment can be put down automatically, due to being not required to compartment can be made to put down automatically by manual operation Manual hydraulic change-over valve, Therefore operation is very easy.2), since the invention also includes Pneumatic hydraulic reversal valve, shuttle valve, dual-pressure valve, pressure sensor, electricity Magnetic gas pressure change valve and master controller;Manual hydraulic change-over valve executes the oil inlet P mouth company of A mouthful of mouth with Pneumatic hydraulic reversal valve Logical, A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve is connected to the rodless cavity of elevating ram, and the of the rodless cavity of gear-selecting cylinder and shuttle valve One A mouthfuls of air inlet is connected to, and the rod chamber of gear-selecting cylinder be connected to C mouthful of the second air inlet of shuttle valve, gas outlet B mouthfuls of shuttle valve and pair P2 mouthfuls of connections of the second air inlet of pressure valve;P mouthfuls of the air inlet of the electromagnetism gas pressure change valve is connected to gas bag, electromagnetism air pressure commutation A mouthfuls of the execution mouth of valve is connected to P1 mouthfuls of the first air inlet of dual-pressure valve, terminals K and the master controller electricity of electromagnetism gas pressure change valve Connection;Gas outlet A mouthfuls of dual-pressure valve with the control mouth of Pneumatic hydraulic reversal valve K mouthfuls be connected to;Pressure sensor and elevating ram Rodless cavity is connected to, and pressure sensor is electrically connected with master controller, when the pressure of pressure sensor reaches setting value, by master control The terminals K of device processed control electromagnetism gas pressure change valve obtains electric, while the timer in master controller starts timing, works as timer When reaching setting value, by the terminals K dead electricity of main controller controls electromagnetism gas pressure change valve.Thus when lift truck was being driven a vehicle When accidentallyying run into Manual hydraulic change-over valve in journey and the compartment of lift truck being made to lift, the at this moment oil inlet of Manual hydraulic change-over valve P mouthfuls with execute mouth A mouthful communicate, the pressure oil in hydraulic pump by Manual hydraulic change-over valve using Pneumatic hydraulic reversal valve entrance The rodless cavity of elevating ram drives elevating mechanism by elevating ram and compartment is driven to lift, and at this moment pressure sensor also has pressure Power simultaneously reaches setting value, and electric, the air inlet of electromagnetism gas pressure change valve is obtained by the terminals K of main controller controls electromagnetism gas pressure change valve Mouth A mouthfuls with execution of P mouthfuls of mouth communicates, and the pressed gas in gas bag enters dual-pressure valve by A mouthfuls of the execution mouth of electromagnetism gas pressure change valve P1 mouthfuls of the first air inlet;Pressed gas of the lift truck in driving states, gas bag passes through manual pneumatic reversal valve at this time simultaneously Using P2 mouthfuls of the second air inlet of the C mouthfuls of arrival dual-pressure valves of A mouthfuls of the first air inlet or the second air inlet of shuttle valve;Pressed gas can K mouthfuls of the control mouth that Pneumatic hydraulic reversal valve is reached after dual-pressure valve makes A mouthfuls of the execution mouth and fuel tank phase of Pneumatic hydraulic reversal valve Logical, the pressure oil of the rodless cavity of elevating ram enters fuel tank after Pneumatic hydraulic reversal valve, by lifting under the gravity in compartment Oil-lifting jar drives elevating mechanism and compartment is driven to fall, i.e., when lift truck accidentallys run into hand-hydraulic commutation when driving Valve and when the compartment of lift truck being made to lift, compartment can be put down automatically, at this moment is not easy to send out when by a lower height of place It makes trouble former.
Description of the drawings
Fig. 1 is the principle of the present invention figure;
Fig. 2 is the schematic diagram that elevating ram is connected on lift truck;
Fig. 3 is the schematic diagram of the shift control of the prior art;
Fig. 4 is the lifting schematic diagram of the elevating ram of the prior art.
Reference numeral in above-mentioned attached drawing is as follows:Fuel tank 1, hydraulic pump 2, Manual hydraulic change-over valve 3, Pneumatic hydraulic reversal valve 4, elevating ram 5, cylinder body 5-1, piston rod 5-2, gear-selecting cylinder 6, block selecting piston rod 6-1, manual pneumatic reversal valve 7, filter 8, safety valve 9, shuttle valve 10, dual-pressure valve 11, gas bag 12, pressure sensor 13, block selecting operation valve 14, operating lever 14-1, electromagnetism gas Press reversal valve 15, master controller 16, vehicle frame 100, elevating mechanism 101, compartment 102.
Specific implementation mode
Below in conjunction with attached drawing and the embodiment provided, the present invention is further illustrated.
As shown in Figure 1, lifting hydraulic system, including fuel tank 1, hydraulic pump 2, hand-hydraulic are forbidden in a kind of walking of lift truck Reversal valve 3, elevating ram 5, gear-selecting cylinder 6, manual pneumatic reversal valve 7, gas bag 12 and block selecting operation valve 14;It further include Pneumatic Liquid Press reversal valve 4, shuttle valve 10, dual-pressure valve 11, pressure sensor 13, electromagnetism gas pressure change valve 15 and master controller 16;The hydraulic pressure The oil inlet of pump 2 is connected to fuel tank 1, and the oil outlet of hydraulic pump 2 is connected to the oil inlet P mouth of Manual hydraulic change-over valve 3, manual liquid B mouthful of the executions mouth of pressure reversal valve 3 is connected to the rod chamber of elevating ram 5, A mouthfuls of the execution mouth of Manual hydraulic change-over valve 3 and pneumatically The oil inlet P mouth of hydraulicdirectional control valve 4 is connected to, and the oil return inlet T mouth of Manual hydraulic change-over valve 3 is connected to fuel tank 1;The Pneumatic hydraulic A mouthfuls of the execution mouth of reversal valve 4 is connected to the rodless cavity of elevating ram 5, and oil return inlet T mouth and the fuel tank 1 of Pneumatic hydraulic reversal valve 4 connect It is logical;Under normal circumstances, Pneumatic hydraulic reversal valve 4 is in normal open state, i.e. the oil inlet P mouth of Pneumatic hydraulic reversal valve 4 and execution A mouthfuls of mouth communicates, when K mouthfuls of the control mouth of Pneumatic hydraulic reversal valve 4 has pressed gas, the execution mouth A of Pneumatic hydraulic reversal valve 4 Mouth is communicated with fuel tank 1.P mouthfuls of the air inlet of the manual pneumatic reversal valve 7 is connected to gas bag 12, and manual pneumatic reversal valve 7 is held A mouthfuls of row mouth is connected to the rodless cavity of gear-selecting cylinder 6, and the rodless cavity of gear-selecting cylinder 6 is connected to A mouthfuls of the first air inlet of shuttle valve 10, B mouthfuls of the execution mouth of manual pneumatic reversal valve 7 is connected to the rod chamber of gear-selecting cylinder 6, rod chamber and the shuttle valve 10 of gear-selecting cylinder 6 Second C mouthfuls of air inlet is connected to, gas outlet T mouthfuls of manual pneumatic reversal valve 7 and atmosphere;The block selecting of the gear-selecting cylinder 6 is lived Stopper rod 6-1 is fixedly connected with the operating lever 14-1 of gear selecting operation valve 14;The cylinder body 6-2 of gear-selecting cylinder 6 is hinged on the machine of lift truck On frame, when driver's operation manual pneumatic reversal valve 7, P mouthfuls of 7 air inlet of manual pneumatic reversal valve is set to be communicated with mouth A is executed, gas bag Pressed gas in 12 reaches the rodless cavity of gear-selecting cylinder 6, the block selecting piston rod of gear-selecting cylinder 6 after manual pneumatic reversal valve 7 6-1 drives the operating lever 14-1 movements of block selecting operation valve 14, and block selecting operation valve 14 is made to hang on forward gear;As driver manipulator Dynamic gas pressure change valve 7 makes P mouthfuls of 7 air inlet of manual pneumatic reversal valve be not communicated with execution mouth A and B mouthfuls of mouth of execution, in gas bag 12 Pressed gas the rodless cavity of gear-selecting cylinder 6 can neither be reached after manual pneumatic reversal valve 7, can not commutate through manual pneumatic The rod chamber that gear-selecting cylinder 6 is reached after valve 7, makes block selecting operation valve 14 hang in neutral gear;When driver operates manual pneumatic commutation Valve 7 makes P mouthfuls of 7 air inlet of manual pneumatic reversal valve be communicated with mouth B is executed, and the pressed gas in gas bag 12 commutates through manual pneumatic The rod chamber of gear-selecting cylinder 6 is reached after valve 7, the block selecting piston rod 6-1 of gear-selecting cylinder 6 drives the operating lever of block selecting operation valve 14 14-1 is moved, and block selecting operation valve 14 is made to hang in retreating gear.Gas outlet B mouthfuls of the shuttle valve 10 with the second air inlet of dual-pressure valve 11 P2 mouthfuls of connections of mouth;P mouthfuls of the air inlet of the electromagnetism gas pressure change valve 15 is connected to gas bag 12, the execution of electromagnetism gas pressure change valve 15 A mouthfuls of mouth is connected to P1 mouthfuls of the first air inlet of dual-pressure valve 11, and gas outlet T mouthfuls of electromagnetism gas pressure change valve 15 is communicated with air, electricity The terminals K of magnetic gas pressure change valve 15 is electrically connected with master controller 16;Under normal circumstances, electromagnetism gas pressure change valve 15 is in dead electricity State and be normally off, i.e. P mouthful of the air inlet of electromagnetism gas pressure change valve 15 is not communicated with for mouth A mouthfuls with execution;The dual-pressure valve 11 Gas outlet A mouthfuls be connected to K mouthfuls of the control mouth of Pneumatic hydraulic reversal valve 4;The pressure sensor 13 is with elevating ram 5 without bar Chamber is connected to, and pressure sensor 13 is electrically connected with master controller 16, when the pressure of pressure sensor 13 reaches setting value, pressure Setting value be compartment 102 gravity under elevating ram 5 rodless cavity the pressure value that has of oil, controlled by master controller 16 The terminals K of electromagnetism gas pressure change valve 15 processed obtain it is electric, at this moment P mouthfuls of 15 air inlet of electromagnetism gas pressure change valve with execute mouth A mouthfuls and communicate, The timer in master controller 16 starts timing simultaneously, when reaching setting value when timer, setting value when timer For the time that elevating ram 5 falls, it is 1 minute or so through testing the time that elevating ram falls, electricity is controlled by master controller 16 The terminals K dead electricity of magnetic gas pressure change valve 15.The master controller 16 is PLC controller, the model Mitsubishi F of master controller 16 × 3U or siemens PLC.
The oil inlet of the hydraulic pump 2 to the oily channel of fuel tank 1 is equipped with filter 8.
The oil outlet of the hydraulic pump 2 to the oily channel of fuel tank 1 is equipped with safety valve 9.
As shown in Fig. 2, in the use of the present invention, being hinged on the cylinder body 5-1 of elevating ram 5 on vehicle frame 100, will lift The piston rod 5-2 of oil cylinder 5 is hinged on elevating mechanism 101.
As shown in Figure 1, when compartment 102 is still in lifting state, driver starts to walk after just lift truck is put into gear, at this moment hand 3 state shown in Fig. 1 of hydrodynamic pressure reversal valve, i.e. A mouthfuls of the execution mouth of Manual hydraulic change-over valve 3 and oil inlet P mouth and oil return inlet T mouth Obstructed, the oil inlet P mouth of Pneumatic hydraulic reversal valve 4 communicates for mouth A mouthfuls with execution at this time, and the oil of the rodless cavity of elevating ram 5 is only Pneumatic hydraulic reversal valve 4 can be passed through, Manual hydraulic change-over valve 3 is cannot pass through and enter fuel tank 1, the gravity in compartment 102 passes through lifting Mechanism 101 is applied on the piston rod of elevating ram 5, so that piston rod is had the trend moved down, to make elevating ram 5 The oil of rodless cavity has pressure, and at this moment pressure sensor 13 also has pressure and reaches setting value, and electricity is controlled by master controller 16 The terminals K of magnetic gas pressure change valve 15 obtain it is electric, P mouthfuls of the air inlet of electromagnetism gas pressure change valve 15 with execute mouth A mouthfuls and communicate, gas bag 12 In pressed gas pass through electromagnetism gas pressure change valve 15 execute A mouthful of mouth into dual-pressure valve 11 P1 mouthfuls of the first air inlets;Simultaneously Driver puts into gear lift truck driving, i.e. lift truck is hung in forward gear or retreating gear, when vehicle is hung on forward gear, hand P mouthful of the air inlet of dynamic gas pressure change valve 7 communicates for mouth A mouthfuls with execution, the pressed gas in gas bag 12 through manual pneumatic reversal valve 7 into Enter the rodless cavity of gear-selecting cylinder 6 and A mouthfuls of the first air inlet of shuttle valve 10, then gas outlet B mouthfuls through shuttle valve 10 arrival dual-pressure valve 11 P2 mouthfuls of the second air inlet.When vehicle is hung in retreating gear, P mouthfuls of the air inlet of manual pneumatic reversal valve 7 with execute mouth B mouthfuls of phase It is logical, pressed gas in gas bag 12 by manual pneumatic reversal valve 7 enter gear-selecting cylinder 6 rod chamber and shuttle valve 10 second into C mouthfuls of gas port, then gas outlet B mouthfuls through shuttle valve 10 P2 mouthfuls of the second air inlet for reaching dual-pressure valve 11.At this moment due to dual-pressure valve 11 P2 mouthfuls of first P1 mouthfuls of air inlet and the second air inlet have pressed gas;Therefore pressed gas can reach pneumatically after dual-pressure valve 11 K mouthfuls of the control mouth of hydraulicdirectional control valve 4 makes A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve 4 be communicated with fuel tank 1, the nothing of elevating ram 5 The pressure oil of rod cavity enters fuel tank 1 after Pneumatic hydraulic reversal valve 4, by 5 band of elevating ram under the action of the gravity in compartment 102 Dynamic elevating mechanism 101 simultaneously drives compartment 102 to fall, although at this moment pressure sensor 13 no longer has pressure, due to main control Not up to setting value when timer in device 16, the terminals K of electromagnetism gas pressure change valve 15 still electricity condition.Pneumatic hydraulic A mouthfuls of the execution mouth of reversal valve 4 is still communicated with fuel tank 1, and the pressure oil of the rodless cavity of elevating ram 5 continues on through Pneumatic hydraulic reversal valve Enter fuel tank 1 after 4, elevating mechanism 101 is driven by elevating ram 5 and compartment 102 is driven to fall, i.e., when compartment 102 is still lifting State, driver just lift truck is put into gear start walk trunk 102 can put down automatically, it is manual by manual operation due to being not required to Hydraulicdirectional control valve 3 can be such that compartment 102 puts down automatically, therefore operation is very easy.
The compartment 102 of lift truck is set to lift when lift truck accidentallys run into Manual hydraulic change-over valve 3 when driving When, at this moment the oil inlet P mouth of Manual hydraulic change-over valve 3 communicates for mouth A mouthfuls with execution, at this time the oil inlet P of Pneumatic hydraulic reversal valve 4 Mouthful with execute mouth A mouthfuls communicate, the pressure oil in hydraulic pump 2 pass through Manual hydraulic change-over valve 3 using Pneumatic hydraulic reversal valve 4 into The rodless cavity for entering elevating ram 5 drives elevating mechanism 101 by elevating ram 5 and compartment 102 is driven to lift, at this moment pressure sensing Device 13 also has pressure and reaches setting value, and the terminals K that electromagnetism gas pressure change valve 15 is controlled by master controller 16 obtains electric, electromagnetism P mouthfuls of the air inlet of gas pressure change valve 15 communicates for mouth A mouthfuls with execution, and the pressed gas in gas bag 12 passes through electromagnetism gas pressure change valve 15 Execute A mouthful of mouth into dual-pressure valve 11 P1 mouthfuls of the first air inlets;Lift truck is hung in driving states, i.e. lift truck at this time simultaneously On forward gear or retreating gear, when lift truck is hung on forward gear, P mouthfuls of the air inlet of manual pneumatic reversal valve 7 and A mouthfuls of mouth of execution It communicates, the pressed gas in gas bag 12 reaches double pressures by manual pneumatic reversal valve 7 using A mouthfuls of the first air inlet of shuttle valve 10 P2 mouthfuls of the second air inlet of valve 11;When vehicle is hung in retreating gear, P mouthfuls of the air inlet of manual pneumatic reversal valve 7 and execution mouth B Mouth communicates, and the pressed gas in gas bag 12 reaches by manual pneumatic reversal valve 7 using C mouthfuls of the second air inlet of shuttle valve 10 double P2 mouthfuls of the second air inlet of pressure valve 11;At this moment since P2 mouthfuls of P1 mouthfuls of the first air inlet of dual-pressure valve 11 and the second air inlet have pressure Strength body;Therefore pressed gas can reach K mouthfuls of the control mouth of Pneumatic hydraulic reversal valve 4 after dual-pressure valve 11, and Pneumatic hydraulic is made to change It is communicated to A mouthfuls of the execution mouth of valve 4 with fuel tank 1, the pressure oil of the rodless cavity of elevating ram 5 enters after Pneumatic hydraulic reversal valve 4 Fuel tank 1 drives elevating mechanism 101 by elevating ram 5 under the gravity in compartment 102 and compartment 102 is driven to fall, though at this moment Right pressure sensor 13 no longer has pressure, but not up to setting value, electromagnetism air pressure is changed when timer in master controller 16 Still electricity condition is being obtained to the terminals K of valve 15.A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve 4 is still communicated with fuel tank 1, lifting oil The pressure oil of the rodless cavity of cylinder 5 enters fuel tank 1 after continuing on through Pneumatic hydraulic reversal valve 4, and elevating mechanism is driven by elevating ram 5 101 and drive compartment 102 fall, i.e., make lifting when lift truck accidentallys run into Manual hydraulic change-over valve 3 when driving When the compartment 102 of vehicle lifts, compartment 102 can be put down automatically, thing at this moment is less likely to occur when by a lower height of place Therefore.
Installation personnel is when carrying out installation exercise, due at this moment 3 state shown in Fig. 1 of Manual hydraulic change-over valve, i.e., manually A mouthfuls of the execution mouth of hydraulicdirectional control valve 3 is obstructed with oil inlet P mouth and oil return inlet T mouth, the oil inlet of Pneumatic hydraulic reversal valve 4 at this time Mouth A mouthfuls with execution of P mouthfuls of mouth communicates, and the oil of the rodless cavity of elevating ram 5 can not enter fuel tank 1, vehicle by Manual hydraulic change-over valve 3 The gravity in compartment 102 is applied to by elevating mechanism 101 on the piston rod of elevating ram 5, and piston rod is made to have what is moved down to become Gesture, to make the oil of the rodless cavity of elevating ram 5 have pressure, at this moment pressure sensor 13 also has pressure and reaches setting Value, the terminals K that electromagnetism gas pressure change valve 15 is controlled by master controller 16 obtain electric, P mouthfuls of the air inlet of electromagnetism gas pressure change valve 15 It is communicated with executing mouth A mouthfuls, the pressed gas in gas bag 12 enters dual-pressure valve 11 by A mouthfuls of the execution mouth of electromagnetism gas pressure change valve 15 P1 mouthfuls of the first air inlet;Simultaneously because driver is there is no putting into gear driving lift truck at this time, but lift truck also hangs over sky It blocks, P mouthfuls of 7 air inlet of manual pneumatic reversal valve is not communicated with execution mouth A and B mouthfuls of mouth of execution, will not be reached in gas bag 12 double P2 mouthfuls of the second air inlet of pressure valve 11, at this moment due to only having P1 mouthfuls of the first air inlet of dual-pressure valve 11 that there are pressed gas, double pressures P2 mouthfuls of the second air inlet of valve 11 does not have pressed gas;Therefore pressed gas cannot reach Pneumatic hydraulic commutation after dual-pressure valve 11 K mouthfuls of the control mouth of valve 4, makes A mouthfuls of the execution mouth of Pneumatic hydraulic reversal valve 4 and is still communicated with oil inlet P mouth, elevating ram 5 The pressure oil of rodless cavity cannot enter fuel tank 1 after Pneumatic hydraulic reversal valve 4, and elevating ram 5 will not drive elevating mechanism 101 simultaneously It drives compartment 102 to fall, normal installation exercise can be carried out.

Claims (3)

1. lifting hydraulic system, including fuel tank (1), hydraulic pump (2), Manual hydraulic change-over valve are forbidden in a kind of walking of lift truck (3), elevating ram (5), gear-selecting cylinder (6), manual pneumatic reversal valve (7), gas bag (12) and block selecting operation valve (14);Its feature It is:It further includes Pneumatic hydraulic reversal valve (4), shuttle valve (10), dual-pressure valve that lifting hydraulic system is forbidden in the walking of the lift truck (11), pressure sensor (13), electromagnetism gas pressure change valve (15) and master controller (16);The oil inlet of the hydraulic pump (2) with Fuel tank (1) is connected to, and the oil outlet of hydraulic pump (2) is connected to the oil inlet P mouth of Manual hydraulic change-over valve (3), hand-hydraulic commutation B mouthfuls of the execution mouth of valve (3) is connected to the rod chamber of elevating ram (5), A mouthfuls of the execution mouth of Manual hydraulic change-over valve (3) with it is pneumatic The oil inlet P mouth of hydraulicdirectional control valve (4) is connected to, and the oil return inlet T mouth of Manual hydraulic change-over valve (3) is connected to fuel tank (1);The gas A mouthfuls of the execution mouth of hydrodynamic pressure reversal valve (4) is connected to the rodless cavity of elevating ram (5), the oil return opening of Pneumatic hydraulic reversal valve (4) T mouthfuls are connected to fuel tank (1);P mouthfuls of the air inlet of the manual pneumatic reversal valve (7) is connected to gas bag (12), manual pneumatic commutation A mouthfuls of the execution mouth of valve (7) is connected to the rodless cavity of gear-selecting cylinder (6), the rodless cavity of gear-selecting cylinder (6) and the first of shuttle valve (10) A mouthfuls of connections of air inlet, B mouthfuls of the execution mouth of manual pneumatic reversal valve (7) are connected to the rod chamber of gear-selecting cylinder (6), gear-selecting cylinder (6) rod chamber is connected to C mouthfuls of the second air inlet of shuttle valve (10), and gas outlet T mouthfuls of manual pneumatic reversal valve (7) connects with air It is logical;The block selecting piston rod (6-1) of the gear-selecting cylinder (6) is fixedly connected with the operating lever (14-1) of gear selecting operation valve (14);Institute State shuttle valve (10) gas outlet B mouthfuls is connected to P2 mouthfuls of the second air inlet of dual-pressure valve (11);The electromagnetism gas pressure change valve (15) P mouthfuls of air inlet be connected to gas bag (12), the first air inlet of A mouthfuls of the execution mouth of electromagnetism gas pressure change valve (15) and dual-pressure valve (11) P1 mouthfuls of connections of mouth, gas outlet T mouthfuls of electromagnetism gas pressure change valve (15) are communicated with air, the terminals of electromagnetism gas pressure change valve (15) K is electrically connected with master controller (16);Gas outlet A mouthfuls of the dual-pressure valve (11) with K mouthfuls of the control mouth of Pneumatic hydraulic reversal valve (4) Connection;The pressure sensor (13) is connected to the rodless cavity of elevating ram (5), and pressure sensor (13) and master controller (16) it is electrically connected, when the pressure of pressure sensor (13) reaches setting value, by master controller (16) control electromagnetism air pressure commutation The terminals K of valve (15) obtains electric, while the timer in master controller (16) starts timing, reaches setting value when timer When, by the terminals K dead electricity of master controller (16) control electromagnetism gas pressure change valve (15).
2. lifting hydraulic system is forbidden in the walking of lift truck according to claim 1, it is characterised in that:The hydraulic pump (2) oil inlet to the oily channel of fuel tank (1) is equipped with filter (8).
3. lifting hydraulic system is forbidden in the walking of lift truck according to claim 1, it is characterised in that:The hydraulic pump (2) oil outlet to the oily channel of fuel tank (1) is equipped with safety valve (9).
CN201710529636.9A 2017-07-02 2017-07-02 Lifting hydraulic system is forbidden in the walking of lift truck Active CN107269603B (en)

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CN109854963B (en) * 2017-11-06 2021-11-30 张玲花 Pipeline detector
CN108466977B (en) * 2018-06-29 2019-08-30 建湖县八达液压机械有限公司 The stabilizer blade cylinder control device of Side Fork Lift Trucks

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JPH0754641Y2 (en) * 1986-05-09 1995-12-18 東洋運搬機株式会社 Handling position control device
DE4322355A1 (en) * 1993-07-05 1995-01-12 Rexroth Mannesmann Gmbh SHR/EHR system for lifting mechanisms
CN202971434U (en) * 2013-01-03 2013-06-05 安徽恒源煤电股份有限公司 Hydraulic system of car pusher
CN103438037B (en) * 2013-08-06 2016-03-23 湖南星邦重工有限公司 A kind of scissors type altitude job platform lifting and down maneuver hydraulic system
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CN108248479B (en) * 2015-03-25 2020-06-30 常州科研试制中心有限公司 Lifting walking forbidding hydraulic system of lifting pipe transporting vehicle
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