CN107840249B - A kind of free off the hook hydraulic system of crane and crane - Google Patents
A kind of free off the hook hydraulic system of crane and crane Download PDFInfo
- Publication number
- CN107840249B CN107840249B CN201711251321.9A CN201711251321A CN107840249B CN 107840249 B CN107840249 B CN 107840249B CN 201711251321 A CN201711251321 A CN 201711251321A CN 107840249 B CN107840249 B CN 107840249B
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- valve
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- oil
- port
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention provides a kind of free off the hook hydraulic system of crane and including the crane of the hydraulic system, wherein hydraulic system includes: hydraulic oil delivery pump, the first working oil path unit for controlling speed reducer clutch, the second working oil path unit for controlling reducer brake, the third working oil path unit for controlling hydraulic motor execution lifting action.The control of third working oil path unit output pilot control signal intervention first working oil path unit and the second working oil path unit while controlling hydraulic motor and executing lifting action, it can rapidly switch under free off the hook mode and realize elevator raising and lowering, without a series of cumbersome operations such as switching working mode.The hydraulic system and crane fundamentally have changed before control mode, effectively raise working efficiency and reliability, the multi-state demand of multi-functional vehicle can be met.
Description
Technical field
The present invention relates to technical field of engineering machinery, in particular to a kind of free off the hook hydraulic system of crane and
Crane.
Background technique
Currently, free off the hook hydraulic system in engineering machinery lifting equipment using more and more extensive, can greatly shorten
Suspension hook transfers the time, improves working efficiency.However existing hydraulic control system and crane can not directly accomplish that power is preferential,
Each handover control system is needed, efficiency is caused to reduce, reliability reduces.
Summary of the invention
It is existing to improve one of the objects of the present invention is to provide a kind of free off the hook hydraulic system of crane and crane
Hydraulic control system and crane the problem of can not directly accomplishing power preferential, low efficiency.
At least one of in order to solve the above-mentioned technical problem, the present invention provides following technical schemes:
A kind of free off the hook hydraulic system of crane, comprising:
Hydraulic oil delivery pump；
For controlling the first working oil path unit of speed reducer clutch, the first working oil path unit includes the first work
Make oil circuit and the first control unit for controlling first working oil path, first working oil path is connected to hydraulic oil
Between delivery pump and speed reducer clutch；The control signal of the first control unit includes control speed reducer throw-out-of clutch
The pilot control signal of first automatically controlled signal and control speed reducer clutch engagement；
For controlling the second working oil path unit of reducer brake, the second working oil path unit includes the second work
Make oil circuit and the second control unit for controlling second working oil path, second working oil path is connected to hydraulic oil
Between delivery pump and control reducer brake；The control signal of second control unit includes control reducer brake system
Dynamic the second automatically controlled signal and control reducer brake terminates the pilot control signal of braking；
The third working oil path unit of lifting action, the third working oil path unit packet are executed for controlling hydraulic motor
Include third working oil path and the third control unit for controlling the third working oil path, the third working oil path connection
Between hydraulic oil delivery pump and hydraulic motor；The third control unit is configured to include the first working condition, the second work
Make state and third working condition；
Wherein, when the third control unit is in the first working condition, the third working oil path is connected to the liquid
The third control unit of first hydraulic fluid port of pressure motor simultaneously exports the pilot control signal；At the third control unit
When the second working condition, the third working oil path is connected to third control while the second hydraulic fluid port of the hydraulic motor
Unit processed exports the pilot control signal；When the third control unit is in third working condition, the third working oil
The first hydraulic fluid port and the second hydraulic fluid port of road and the hydraulic motor disconnect and the third control unit terminates and exports the guide
Control signal.
Further, in alternative embodiment of the invention, the third control unit includes the first pilot valve and/or door
Type shuttle valve；
The pressure oil port P of the first pilot valve directly or indirectly oil outlet phase with the hydraulic oil delivery pump
Even；
First actuator port A of first pilot valve the first hydraulic fluid port and described or door with the hydraulic motor simultaneously
First oil inlet of type shuttle valve is connected；
Second actuator port B of first pilot valve the second hydraulic fluid port and described or door with the hydraulic motor simultaneously
Second oil inlet of type shuttle valve is connected；
For described or gate shuttle valve oil outlet output hydraulic pressure oil as pressure signal, the pilot control signal is the pressure
Force signal is either by the electric signal after pressure signal conversion.
Further, in alternative embodiment of the invention, the pilot control signal is the pressure signal, described the
One control unit and second control unit all have the pilot port for receiving the pressure signal；It is described or gate shuttle valve go out
Hydraulic fluid port is connected with the pilot port of the first control unit and second control unit simultaneously.
Further, in alternative embodiment of the invention, the third control unit includes the first pilot valve, the first list
To valve and second one-way valve；
The pressure oil port P of the first pilot valve directly or indirectly oil outlet phase with the hydraulic oil delivery pump
Even；
First actuator port A of first pilot valve simultaneously with the first hydraulic fluid port of the hydraulic motor and described first
The oil inlet of check valve is connected；
Second actuator port B of first pilot valve simultaneously with the second hydraulic fluid port of the hydraulic motor and described second
The oil inlet of check valve is connected；
First check valve and the second one-way valve are through same oil outlet output hydraulic pressure oil as pressure signal；The elder generation
Leading control signal is the pressure signal either by the electric signal after pressure signal conversion.
Further, in alternative embodiment of the invention, the first pilot valve is handle pilot valve.
Further, in alternative embodiment of the invention, the first control unit includes the first two-position four-way electromagnetism
Valve and the first two-position four-way pilot operated directional control valve, the pressure oil port P and the hydraulic oil of first two-position four-way solenoid valve are conveyed
The oil outlet of pump is connected, the actuator port B of first two-position four-way solenoid valve and the first two-position four-way pilot operated directional control valve
Pressure oil port P be connected；The actuator port B of the first two-position four-way pilot operated directional control valve is connected with the speed reducer clutch；
The pilot port is located at the first two-position four-way pilot operated directional control valve.
Further, in alternative embodiment of the invention, second control unit includes the second two-position four-way electromagnetism
Valve and the second two-position four-way pilot operated directional control valve, the pressure oil port P and the hydraulic oil of second two-position four-way solenoid valve are conveyed
The oil outlet of pump is connected, the actuator port B of second two-position four-way solenoid valve and the second two-position four-way pilot operated directional control valve
Pressure oil port P be connected；The actuator port B of the second two-position four-way pilot operated directional control valve is connected with the speed reducer clutch；
The pilot port is located at the second two-position four-way pilot operated directional control valve.
Further, in alternative embodiment of the invention, the hydraulic system further includes for controlling hoist brake
The 4th working oil path unit, the 4th working oil path unit includes the 4th working oil path and for controlling the 4th work
Make the 4th control unit of oil circuit, the 4th working oil path is connected between hydraulic oil delivery pump and hoist brake；It is preferred that
Ground, the 4th control unit include the second pilot valve, the pressure oil port P of second pilot valve directly or indirectly with institute
It states hydraulic oil delivery pump to be connected, the actuator port A of second pilot valve is connected with the hoist brake；It is highly preferred that institute
Stating the second pilot valve is pedal pilot valve.
Further, in alternative embodiment of the invention, the hydraulic system further includes pressure reducing valve, the pressure reducing valve
Pressure oil port is connected with the hydraulic oil delivery pump, the actuator port A of the pressure reducing valve and second control unit and described
The pressure oil port P of third control unit is connected.
The present invention also provides a kind of cranes comprising the free off the hook hydraulic system of above-mentioned crane.
The beneficial effect comprise that
The free off the hook hydraulic system of the crane that the present invention obtains by above-mentioned design and crane, in use, in elevator
It handles under lock state, it is de- that first control unit can control control speed reducer clutch when receiving the first automatically controlled signal
It opens；And the second control unit needs while receiving the second automatically controlled signal and the pilot control signal ability from third control unit
It can control reducer brake and terminate braking；
The execution lifting action that third control unit can control hydraulic motor can also terminate, and connect in the second control unit
Under the premise of receiving the second automatically controlled signal, the pilot control signal (pressure of third control unit (can be handle pilot valve) is taken
Power), pilot control signal can be exported in the liter of hydraulic motor or the start node of drop, to control only by third single
The i.e. controllable speed reducer clutch of member engages, reducer brake disengages and control hydraulic motor executes and rises or drop (speed reducer
It is that hydraulic motor executes the premise for rising or dropping that clutch engagement and reducer brake, which disengage).
The free off the hook hydraulic system of crane of the invention and crane can receive the pilot control of third control unit
Signal realizes the engagement of speed reducer clutch while controlling reducer brake disengagement.It can be fast under free off the hook mode
Switch fastly and realize elevator raising and lowering, without a series of cumbersome operations such as switching working mode.The hydraulic system and
Crane fundamentally have changed before control mode, effectively raise working efficiency and reliability, can meet multi-functional
The multi-state demand of vehicle.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of block diagram for the free off the hook hydraulic system of crane that embodiment of the present invention provides；
Fig. 2 is the block diagram for the free off the hook hydraulic system of another crane that embodiment of the present invention provides；
Fig. 3 is the block diagram for the free off the hook hydraulic system of another crane that embodiment of the present invention provides；
Fig. 4 is the schematic diagram for the free off the hook hydraulic system of crane that one embodiment of the present of invention provides.
Icon: 1- pedal pilot valve；2- pressure reducing valve；The first two-position four-way solenoid valve of 3-；4- the first two-position four-way hydraulic control is changed
To valve；5- handle pilot valve；6- or gate shuttle valve；7- bigeminy commutation valve group；The second two-position four-way solenoid valve of 7a-；7b- the two or two
Position four-way pilot operated directional control valve；8- disk brake；9- speed reducer clutch；10- elevator；11- overflow valve；12- servopump；P- pressure
Power hydraulic fluid port；A, B- actuator port；T- oil return opening；C, C1- pilot port.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can be expressed
Or implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or two
More than, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, the terms such as term " connected ", " connection " should do broad sense reason
Solution, for example, it may be connected directly, can also indirectly connected through an intermediary, can be connection inside two elements or
The interaction relationship of two elements.For the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term in the present invention.
Referring to FIG. 1, the free off the hook hydraulic system of crane that one embodiment of the present invention provides, including hydraulic oil are defeated
Send pump, the first working oil path unit for controlling the disengagement of speed reducer clutch 9, the second work for controlling reducer brake
Make oil circuit unit and executes the third working oil path unit of lifting action for controlling hydraulic motor.Hydraulic oil delivery pump can be with
Using servopump 12, be conducive to the conveying for accurately controlling hydraulic oil.
Wherein, the first working oil path unit includes the first working oil path and the first control for controlling the first working oil path
Unit processed, the first working oil path are connected between hydraulic oil delivery pump and speed reducer clutch 9；The control of first control unit is believed
Number include control speed reducer clutch 9 disengage the first automatically controlled signal and control speed reducer clutch 9 engage pilot control letter
Number.
It is possible to further realize control speed reducer together by the first automatically controlled signal and pilot control signal collective effect
Clutch 9 engages.For example, speed reducer clutch 9 disengages when only receiving the first automatically controlled signal；Only receiving guide's control
When signal processed, speed reducer clutch 9 is retained in the working position under laststate.The first automatically controlled signal and guide are received at the same time
Speed reducer clutch 9 engages when controlling signal, realizes the transmission connection of speed reducer and elevator 10.It that is can be in speed reducer
Clutch 9 is in the state of disengagement, and speed reducer clutch can be realized by providing pilot control signal to first control unit
Device 9 engages.
Further, with reference to Fig. 4, in alternative embodiment of the invention, first control unit includes the first two-position four-way
Solenoid valve 3 and the first two-position four-way pilot operated directional control valve 4, the pressure oil port P and hydraulic oil delivery pump of the first two-position four-way solenoid valve 3
Oil outlet be connected, the pressure oil of the actuator port B of the first two-position four-way solenoid valve 3 and the first two-position four-way pilot operated directional control valve 4
Mouth P is connected；The actuator port B of first two-position four-way pilot operated directional control valve 4 is connected with speed reducer clutch 9；First two-position four-way liquid
Controlling reversal valve 4 also has the pilot port for receiving above-mentioned pilot control signal.
Speed reducer clutch 9, which can be, realizes disengagement when there is pressure input, can reset bullet when without pressure input
It is resetted under the action of the return units such as spring and remains engaged with state.
When the first two-position four-way solenoid valve 3 must be electric, that is, above-mentioned first automatically controlled signal is obtained, what hydraulic oil delivery pump provided
Hydraulic oil enters the pressure oil port P of the first two-position four-way pilot operated directional control valve 4 by the first two-position four-way solenoid valve 3.In static work
Making under position, the pressure oil port P of the first two-position four-way pilot operated directional control valve 4, which can be, to be connected to its actuator port B, as long as the one or two
The pressure oil port P of position four-way solenoid valve 3 is connected to its actuator port B, and the hydraulic oil that hydraulic oil delivery pump provides can lead to simultaneously
Crossing the first two-position four-way solenoid valve 3 and the first two-position four-way pilot operated directional control valve 4 makes speed reducer clutch into speed reducer clutch 9
9 disengage.
When the first two-position four-way solenoid valve 3 it is electric under the premise of, the pilot port of the first two-position four-way pilot operated directional control valve 4 has pressure
When power inputs, the hydraulic oil that the first two-position four-way pilot operated directional control valve 4 provides hydraulic oil delivery pump is cut off, and the first two-position four-way
The circuit of pilot operated directional control valve 4 is opened, under the action of reset spring) hydraulic oil in speed reducer clutch 9 passes through the one or two
Position four-way pilot operated directional control valve 4 returns to mailbox, while speed reducer clutch 9 realizes engagement.
Further, alternatively, in another alternative embodiment of the invention, two can be used
Four way solenoid valve replaces the first two-position four-way pilot operated directional control valve 4 in above-mentioned alternative embodiment, i.e. first control unit includes two
A first two-position four-way solenoid valve 3.Connection type can refer to a upper embodiment, the difference is that only pilot control signal
Type is different, and in a upper embodiment, pilot control signal is the pressure signal of hydraulic oil, and in this embodiment, pilot control
Signal is electric signal.Further, which can be electricity of the pressure signal of third control unit output after conversion
Signal.Such as the pressure signal that third control unit exports is converted to corresponding electric signal by pressure sensor, with the electricity
Signal controls the first two-position four-way solenoid valve 3 being connected with speed reducer clutch 9.
Second working oil path unit includes the second working oil path and the second control list for controlling the second working oil path
Member, the second working oil path are connected between hydraulic oil delivery pump and control reducer brake；The control of second control unit is believed
Number include control reducer brake braking the second automatically controlled signal and control reducer brake terminate braking pilot control
Signal.
Further, with reference to Fig. 4, in alternative embodiment of the invention, the second control unit includes the second two-position four-way
The pressure oil port P and hydraulic oil of solenoid valve 7a and the second two-position four-way pilot operated directional control valve 7b, the second two-position four-way solenoid valve 7a are defeated
The oil outlet of pump is sent to be connected, the actuator port B of the second two-position four-way solenoid valve 7a and the second two-position four-way pilot operated directional control valve 7b's
Pressure oil port P is connected；The actuator port B of second two-position four-way pilot operated directional control valve 7b is connected with speed reducer clutch 9；Pilot port position
In the second two-position four-way pilot operated directional control valve 7b.
Second two-position four-way solenoid valve 7a can be in static working position, and pressure oil port P is not connected to actuator port,
Actuator port is connected to oil return inlet T；When the second two-position four-way solenoid valve 7a obtains electric, pressure oil port P is connected to the working port.
Second two-position four-way pilot operated directional control valve 7b can be in static working position, and pressure oil port P does not connect with actuator port A
Logical, actuator port A is connected to the return port；After the second two-position four-way pilot operated directional control valve 7b receives pilot control signal, the
The pressure oil port P of two two-position four-way pilot operated directional control valve 7b is connected to actuator port A, and then the hydraulic oil of hydraulic oil delivery pump output
Successively entering reducer brake after the second two-position four-way solenoid valve 7a and the second two-position four-way pilot operated directional control valve 7b makes to subtract
Fast brake terminates braking, and then speed reducer can run well.
Further, third working oil path unit include third working oil path and for controlling third working oil path
Three control units, third working oil path are connected between hydraulic oil delivery pump and hydraulic motor；Third control unit is configured to
Including the first working condition, the second working condition and third working condition.
Wherein, when third control unit is in the first working condition, third working oil path is connected to the first of hydraulic motor
The third control unit of hydraulic fluid port simultaneously exports pilot control signal.
When third control unit is in the second working condition, third working oil path is connected to the second hydraulic fluid port of hydraulic motor
Third control unit exports pilot control signal simultaneously.
When third control unit is in third working condition, the first hydraulic fluid port and of third working oil path and hydraulic motor
Two hydraulic fluid ports disconnect and third control unit terminates output pilot control signal.
Described in brought forward, first control unit can be such that speed reducer clutch 9 engages after receiving pilot control signal；Second
Control unit can make reducer brake terminate braking after receiving pilot control signal.In other words, no matter third controls
Unit is in the first working condition or the second working condition, can make the engagement of speed reducer clutch 9 and reducer brake
Braking is terminated, it in turn, can be under the premise of third control unit also controls hydraulic motor while export pilot control signal
Elevator 10 is driven to go up and down.
When third control unit is in third working condition, hydraulic motor does not work, and third control unit is not yet
Export pilot control signal.Under the state, the first two-position four way change valve of first control unit is in static working position, if the
One two-position four-way solenoid valve 3 must be electric, then speed reducer throw-out-of clutch；Second two-position four way change valve of the second control unit is also located
In static working position, reducer brake brakes speed reducer.
Further, with reference to Fig. 4, in alternative embodiment of the invention, third control unit include the first pilot valve and
Or gate shuttle valve 6.
The pressure oil port P of first pilot valve is directly or indirectly connected with the oil outlet of hydraulic oil delivery pump.
First actuator port A of the first pilot valve simultaneously with the first hydraulic fluid port of hydraulic motor and or gate shuttle valve 6 the
One oil inlet is connected.
Second actuator port B of the first pilot valve simultaneously with the second hydraulic fluid port of hydraulic motor and or gate shuttle valve 6 the
Two oil inlets are connected.
Or the oil outlet output hydraulic pressure oil of gate shuttle valve 6 is as pressure signal, pilot control signal be pressure signal or
It is the electric signal after being converted by pressure signal.
Further, in alternative embodiment of the invention, pilot control signal be pressure signal, first control unit and
Second control unit all has the pilot port for receiving pressure signal；Or the oil outlet of gate shuttle valve 6 simultaneously and first control unit
It is connected with the pilot port of the second control unit.
Above-mentioned pressure signal can be converted into corresponding electric signal by pressure sensor, then use the electric signal as first
Lead the control of control signal intervention first control unit and the second control unit.
Above-mentioned or gate shuttle valve 6 can also be substituted with two check valves.
Further, in alternative embodiment of the invention, third control unit includes the first pilot valve, the first check valve
And second one-way valve.
The pressure oil port P of first pilot valve is directly or indirectly connected with the oil outlet of hydraulic oil delivery pump.
First actuator port A of the first pilot valve oil inlet with the first hydraulic fluid port and the first check valve of hydraulic motor simultaneously
Mouth is connected.
Second actuator port B of the first pilot valve simultaneously with the second hydraulic fluid port of hydraulic motor and the oil inlet of second one-way valve
Mouth is connected.
First check valve and second one-way valve are through same oil outlet output hydraulic pressure oil as pressure signal；Pilot control letter
Number for pressure signal either converted by pressure signal after electric signal.
Further, in alternative embodiment of the invention, the first pilot valve is handle pilot valve 5.Handle pilot valve 5 has
There are three working position, three working positions of handle pilot valve 5 correspond to three working conditions of third control unit.
Further, as shown in Fig. 2, in alternative embodiment of the invention, hydraulic system further includes for controlling elevator
4th working oil path unit of brake, the 4th working oil path unit include the 4th working oil path and work for controlling the 4th
4th control unit of oil circuit, the 4th working oil path are connected between hydraulic oil delivery pump and hoist brake.
Further, with reference to Fig. 4, the 4th control unit includes the second pilot valve, and the pressure oil port P of the second pilot valve is direct
Or be connected indirectly with hydraulic oil delivery pump, the actuator port A of the second pilot valve is connected with hoist brake.It is highly preferred that
Second pilot valve is pedal pilot valve 1.Further, hoist brake can select disk brake 8.
Further, as shown in figure 3, in alternative embodiment of the invention, hydraulic system further includes pressure reducing valve 2, decompression
The pressure oil port of valve 2 is connected with hydraulic oil delivery pump, and the actuator port A of pressure reducing valve 2 and the second control unit and third control single
The pressure oil port P of member is connected.Pressure reducing valve 2 can provide stable low pressure and carry out SERVO CONTROL.
Further, in alternative embodiment of the invention, the actuator port A and the second control unit, third of pressure reducing valve 2
The pressure oil port P of control unit and the 4th control unit is connected.
The present invention also provides a kind of cranes comprising the free off the hook hydraulic system of above-mentioned any crane.
Embodiment 1, referring to shown in Fig. 4,
A kind of free off the hook hydraulic system of crane, including pedal pilot valve 1, pressure reducing valve 2, the first two-position four-way solenoid valve
3, the first two-position four-way pilot operated directional control valve 4, handle pilot valve 5 or gate shuttle valve 6, bigeminy commutation valve group 7, disk brake 8,
Speed reducer clutch 9, elevator 10, overflow valve 11 and servopump 12.
Wherein, bigeminy commutation valve group 7 includes the second two-position four-way solenoid valve 7a and the second two-position four-way pilot operated directional control valve 7b.
The oil inlet phase of the oil outlet of servopump 1212 and overflow valve 11, pressure reducing valve 2 and the first two-position four-way solenoid valve 3
Even.
The actuator port A of pressure reducing valve 2 and pedal pilot valve 1, handle pilot valve 5 and the second two-position four-way solenoid valve 7a
Pressure oil port P is connected.
The actuator port A of pedal pilot valve 1 is connected with hoist brake, when pedal pilot valve 1 is in static working position, foot
The pressure oil port p for stepping on pilot valve 1 is in an off state, and disk brake 8 has Flexible Reset, in the input of no ambient pressure
In the case of, elevator 10 is not braked.When stepping on pedal pilot valve 1, the hydraulic oil that servopump 12 exports can be by foot-operated guide
Valve 1 flows into hoist brake, and then can brake to elevator 10.
The pressure oil port P phase of the actuator port B of first two-position four-way solenoid valve 3 and the first two-position four-way pilot operated directional control valve 4
Even.The actuator port B of first two-position four-way pilot operated directional control valve 4 is connected with speed reducer clutch 9.First two-position four-way liquid controlled reversing
Valve 4 also has the pilot port C for receiving pilot control signal.In static working position, (right side works first two-position four-way solenoid valve 3
Position) when, pressure oil port P is not connected to actuator port B, and actuator port B is connected to oil return inlet T；When the second two-position four-way electricity
(left side working position is in) when magnet valve 7a obtains electric, and pressure oil port P is connected to actuator port B.
The pressure oil port P of the actuator port B of second two-position four-way solenoid valve 7a and the second two-position four-way pilot operated directional control valve 7b
It is connected.The actuator port B of second two-position four-way pilot operated directional control valve 7b is connected with speed reducer clutch 9.Second two-position four-way hydraulic control
Reversal valve 7b has the pilot port C1 for receiving pilot control signal.
Second two-position four-way solenoid valve 7a is at static working position (upside working position), pressure oil port P and actuator port
It is not connected to, actuator port is connected to oil return inlet T；When the second two-position four-way solenoid valve 7a obtains electric (downside working position), pressure
Power hydraulic fluid port P is connected to the working port.Second two-position four-way pilot operated directional control valve 7b can at static working position (downside working position),
Its pressure oil port P is not connected to actuator port A, and actuator port A is connected to the return port；When the second two-position four-way pilot operated directional control valve
7b receive pilot control signal after (in downside working position), the pressure oil port P of the second two-position four-way pilot operated directional control valve 7b with
Actuator port A connection.
First actuator port A of handle pilot valve 5 simultaneously with the first hydraulic fluid port of hydraulic motor and or gate shuttle valve 6 the
One oil inlet is connected.Second actuator port B of the first pilot valve the second hydraulic fluid port and or gate shuttle valve 6 with hydraulic motor simultaneously
The second oil inlet be connected.When handle pilot valve 5 is in the first working position, elevator 10 rises；Handle pilot valve 5 is in the first work
When making position, elevator 10 declines.
Or the oil outlet of gate shuttle valve 6 is connected with pilot port C and pilot port C1, direct output hydraulic pressure oil to pilot port C and
Pilot port C1 is as pilot control signal.
Pedal pilot valve 1, pressure reducing valve 2, the first two-position four-way solenoid valve 3, the first two-position four-way pilot operated directional control valve 4, handle
The oil return opening of pilot valve 5, bigeminy commutation valve group 7 and overflow valve 11 takes back fuel tank.The oil inlet of servopump 12 is connected to oil
Case is to obtain hydraulic oil from fuel tank.
A kind of free off the hook hydraulic system of crane of the present embodiment includes normal lifting mode and free off the hook mode, and
And both modes can mutually switch.
1) mode is normally lifted
First two-position four-way solenoid valve 3 is in power loss, and speed reducer clutch 9 is in engagement state；Second two-position four-way electricity
Magnet valve 7a is in electric, and while be in third working position (and handle pilot valve 5) reducer brake is in the open state (to brake shape
State).
By Manual operation handle pilot valve 5, so that handle pilot valve 5 is in the first working position, (third control unit is in
First working condition) or the second working position (third control unit is in the second working condition), handle pilot valve 5 can all export
Pilot control signal intervenes the control of the second control unit, and reducer brake is made to release braking.Handle pilot valve 5 is in first
Working position perhaps the second working position when elevator 10 correspondence risen or declined.
2) free off the hook mode
After switching to free off the hook mode, bigeminy commutation valve group 77 is in electric.
Pedal pilot valve 1 is stepped on, pedal pilot valve 11 controls disk brake 8 to lock elevator 10.
Free off the hook button is pressed, obtains the first two-position four-way solenoid valve 33 electric, speed reducer clutch 9 disengages, speed reducer
It is not sequentially connected with elevator 10.
Pedal pilot valve 1 is unclamped, then disk brake 8 unclamps elevator 10, and elevator 10 realizes free off the hook.
When falling to specified altitude assignment, pedal pilot valve 1 is stepped on, locks elevator 10.
Operation handle pilot valve 5 is in the first working position and unclamps pedal pilot valve 1, the hydraulic oil warp that servopump 12 exports
Or gate shuttle valve 6 enter the first two-position four-way pilot operated directional control valve 4, the actuator port B of the first two-position four-way pilot operated directional control valve 4 with return
Hydraulic fluid port T connection, under the action of the reset spring of clutch, the hydraulic oil for controlling clutch flows into mailbox, and clutch engagement subtracts
Fast machine and reel are sequentially connected.Meanwhile hydraulic oil opens reducer brake, reducer brake by bigeminy commutation valve group 7
To the brake release of speed reducer, 10 vertical motion of elevator is realized.
When rising to specified altitude assignment, if need to normally decline (non-free off the hook), operation handle pilot valve 5 to the second is only needed
Working position.
If needing free off the hook in normal hoisting process, then stepping on pedal pilot valve 1, operation handle pilot valve 5 to third
Working position, the first two-position four way change valve lose pilot control signal, and (speed reducer and elevator 10 are not for the disengagement of speed reducer clutch 9
Transmission connection), when unclamping pedal pilot valve 1, it can be achieved that free off the hook.
It if free off the hook need to be stopped, need to only making 33 power loss of the first two-position four-way solenoid valve, can restore normally to lift mould
Formula.
Further, the present embodiment, which also provides, a kind of is provided with a kind of lifting of the free off the hook hydraulic system of crane
Machine.
The free off the hook hydraulic system of crane of the invention and crane can receive the pilot control of third control unit
Signal realizes that speed reducer clutch 9 engages while controlling reducer brake disengagement.It can be fast under free off the hook mode
Switch fastly and realize 10 raising and lowering of elevator, without a series of cumbersome operations such as switching working mode.The hydraulic system
And crane fundamentally have changed before control mode, effectively raise working efficiency and reliability, more function can be met
The multi-state demand of energy vehicle.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of free off the hook hydraulic system of crane characterized by comprising
Hydraulic oil delivery pump；
For controlling the first working oil path unit of speed reducer clutch, the first working oil path unit includes the first working oil
Road and first control unit for controlling first working oil path, first working oil path are connected to hydraulic oil conveying
Between pump and speed reducer clutch；The control signal of the first control unit includes control speed reducer throw-out-of clutch first
The pilot control signal of automatically controlled signal and control speed reducer clutch engagement；
For controlling the second working oil path unit of reducer brake, the second working oil path unit includes the second working oil
Road and the second control unit for controlling second working oil path, second working oil path are connected to hydraulic oil conveying
Between pump and control reducer brake；The control signal of second control unit includes that control reducer brake is braked
Second automatically controlled signal and control reducer brake terminate the pilot control signal of braking；
The third working oil path unit of lifting action is executed for controlling hydraulic motor, the third working oil path unit includes the
Three working oil paths and third control unit for controlling the third working oil path, the third working oil path are connected to liquid
Between pressure oil delivery pump and hydraulic motor；The third control unit is configured to include the first working condition, the second work shape
State and third working condition；
Wherein, when the third control unit is in the first working condition, the third working oil path is connected to the hydraulic horse
The third control unit of the first hydraulic fluid port reached simultaneously exports the pilot control signal；The third control unit is in the
When two working conditions, it is single that the third working oil path is connected to third control while the second hydraulic fluid port of the hydraulic motor
Member exports the pilot control signal；When the third control unit is in third working condition, the third working oil path with
First hydraulic fluid port of the hydraulic motor and the second hydraulic fluid port disconnect and the third control unit terminates and exports the pilot control
Signal.
2. the free off the hook hydraulic system of crane according to claim 1, which is characterized in that the third control unit packet
Include the first pilot valve and/or gate shuttle valve；
The pressure oil port P of first pilot valve is directly or indirectly connected with the oil outlet of the hydraulic oil delivery pump；
First actuator port A of first pilot valve the first hydraulic fluid port and described or gate shuttle with the hydraulic motor simultaneously
First oil inlet of valve is connected；
Second actuator port B of first pilot valve the second hydraulic fluid port and described or gate shuttle with the hydraulic motor simultaneously
Second oil inlet of valve is connected；
For described or gate shuttle valve oil outlet output hydraulic pressure oil as pressure signal, the pilot control signal is pressure letter
Number either by the pressure signal conversion after electric signal.
3. the free off the hook hydraulic system of crane according to claim 2, which is characterized in that the pilot control signal is
The pressure signal, the first control unit and second control unit all have the guide for receiving the pressure signal
Mouthful；Described or gate shuttle valve oil outlet pilot port phase with the first control unit and second control unit simultaneously
Even.
4. the free off the hook hydraulic system of crane according to claim 1, which is characterized in that the third control unit packet
Include the first pilot valve, the first check valve and second one-way valve；
The pressure oil port P of first pilot valve is directly or indirectly connected with the oil outlet of the hydraulic oil delivery pump；
First actuator port A of first pilot valve simultaneously with the first hydraulic fluid port of the hydraulic motor and described first unidirectional
The oil inlet of valve is connected；
Second actuator port B of first pilot valve simultaneously with the second hydraulic fluid port of the hydraulic motor and described second unidirectional
The oil inlet of valve is connected；
First check valve and the second one-way valve are through same oil outlet output hydraulic pressure oil as pressure signal；Guide's control
Signal processed is the pressure signal either by the electric signal after pressure signal conversion.
5. according to the free off the hook hydraulic system of the described in any item cranes of claim 2 to 4, which is characterized in that the first guide
Valve is handle pilot valve.
6. the free off the hook hydraulic system of crane according to claim 3, which is characterized in that the first control unit packet
Include the first two-position four-way solenoid valve and the first two-position four-way pilot operated directional control valve, the pressure oil port of first two-position four-way solenoid valve
P is connected with the oil outlet of the hydraulic oil delivery pump, the actuator port B of first two-position four-way solenoid valve and the described 1st
The pressure oil port P of position four-way pilot operated directional control valve is connected；The actuator port B of the first two-position four-way pilot operated directional control valve subtracts with described
Fast machine clutch is connected；The pilot port is located at the first two-position four-way pilot operated directional control valve.
7. the free off the hook hydraulic system of crane according to claim 3, which is characterized in that the second control unit packet
Include the second two-position four-way solenoid valve and the second two-position four-way pilot operated directional control valve, the pressure oil port of second two-position four-way solenoid valve
P is connected with the oil outlet of the hydraulic oil delivery pump, the actuator port B of second two-position four-way solenoid valve and the described 2nd 2
The pressure oil port P of position four-way pilot operated directional control valve is connected；The actuator port B of the second two-position four-way pilot operated directional control valve subtracts with described
Fast machine clutch is connected；The pilot port is located at the second two-position four-way pilot operated directional control valve.
8. the free off the hook hydraulic system of crane according to claim 1, which is characterized in that the hydraulic system further includes
For controlling the 4th working oil path unit of hoist brake, the 4th working oil path unit include the 4th working oil path and
For controlling the 4th control unit of the 4th working oil path, the 4th working oil path is connected to hydraulic oil delivery pump and volume
It raises between brake.
9. the free off the hook hydraulic system of crane according to claim 8, which is characterized in that the 4th control unit packet
The second pilot valve is included, the pressure oil port P of second pilot valve is directly or indirectly connected with the hydraulic oil delivery pump, institute
The actuator port A for stating the second pilot valve is connected with the hoist brake.
10. the free off the hook hydraulic system of crane according to claim 9, which is characterized in that second pilot valve is
Pedal pilot valve.
11. the free off the hook hydraulic system of crane according to claim 1, which is characterized in that the hydraulic system is also wrapped
Pressure reducing valve is included, the pressure oil port of the pressure reducing valve is connected with the hydraulic oil delivery pump, the actuator port A of the pressure reducing valve and institute
The second control unit is stated to be connected with the pressure oil port P of the third control unit.
12. a kind of crane, which is characterized in that including according to claim 1 to 11 described in any item free off the hook of crane
Hydraulic system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711251321.9A CN107840249B (en) | 2017-12-01 | 2017-12-01 | A kind of free off the hook hydraulic system of crane and crane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711251321.9A CN107840249B (en) | 2017-12-01 | 2017-12-01 | A kind of free off the hook hydraulic system of crane and crane |
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| Publication Number | Publication Date |
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| CN107840249A CN107840249A (en) | 2018-03-27 |
| CN107840249B true CN107840249B (en) | 2019-06-07 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026858A (en) * | 2018-10-26 | 2018-12-18 | 北京中车重工机械有限公司 | The hydraulic control device and dynamic compaction machinery of the free off the hook hoist engine of dynamic compaction machinery |
| CN110723674B (en) * | 2019-09-19 | 2020-11-06 | 中联重科股份有限公司 | Hydraulic control loop for free hook-falling winch and hoisting device |
| CN110844787A (en) * | 2019-11-20 | 2020-02-28 | 浙江三一装备有限公司 | Free hook falling control system and crane |
| CN110980529B (en) * | 2019-12-30 | 2020-12-11 | 浙江三一装备有限公司 | Crane hydraulic control system and crane |
| CN113526385B (en) * | 2021-07-27 | 2022-12-27 | 徐工集团工程机械股份有限公司建设机械分公司 | Hydraulic control system of winding drum, winding device and crane |
| CN114195046B (en) * | 2021-12-14 | 2023-08-01 | 浙江三一装备有限公司 | Multifunctional forklift hydraulic control system and multifunctional forklift |
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| JP2001139280A (en) * | 1999-11-16 | 2001-05-22 | Sumitomo Constr Mach Co Ltd | Overload preventing device for construction machine |
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| CN107840249A (en) | 2018-03-27 |
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