CN207750302U - A kind of lorry-mounted crane multi-way reversing device - Google Patents
A kind of lorry-mounted crane multi-way reversing device Download PDFInfo
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- CN207750302U CN207750302U CN201721312852.XU CN201721312852U CN207750302U CN 207750302 U CN207750302 U CN 207750302U CN 201721312852 U CN201721312852 U CN 201721312852U CN 207750302 U CN207750302 U CN 207750302U
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Abstract
The utility model discloses a kind of lorry-mounted crane multi-way reversing devices, including oil inlet oil circuit, oil return opening, raising for operating amplitude oil cylinder, stop and drop back into the luffing reversal valve of three kinds of actions, stretching for operating telescopic oil cylinder, the flexible reversal valves of stopping and three kinds of actions of retracting, rising for operating hoist motor, stop and decline the elevator reversal valve of three kinds of actions, forward direction for operating rotary motor, the slewing directional control valve and function module of stopping and reverse three kinds of actions, luffing reversal valve and flexible reversal valve parallel connection oil inlet oil circuit both ends, slewing directional control valve, function module and the series connection of oil inlet oil circuit, after flexible reversal valve and function module interflow with elevator reversal valve, oil return opening is sequentially connected in series；The present apparatus realizes luffing and five kinds of elevator, luffing and revolution, flexible and elevator, flexible and revolution and revolution and elevator etc. composite moves, composite move can be realized without proportional multi-way valve, the cost performance for the straight-arm lorry-mounted crane that effectively reduces the cost, improves.
Description
Technical field
The utility model is related to a kind of lorry-mounted crane multi-way reversing devices, belong to technical field of engineering machinery.
Background technology
Lorry-mounted crane is that one kind is mounted on automobile chassis, in a certain range more actions machinery of handling of heavy goods, tool
There is the characteristics of quick, flexible, efficient, convenient, collection handling transport is combined into one, is widely used in urban construction, colliery engineering, garden
Woods afforests the fields such as lifting and transport with equipment.According to structure type, lorry-mounted crane can be divided into straight-arm lorry-mounted crane and
Folding arm lorry-mounted crane.
Straight-arm lorry-mounted crane can stretch out arm or retract by the telescopic oil cylinder of arm, be drawn by hoisting mechanism
Steel wire rope can lift cargo, and main actions include luffing, flexible, elevator and revolution etc., have the easy to operate, scope of application
Extensively, the advantages that safe, is used widely in China.In recent years, maneuverability, energy saving with market, the development of technology
Property, modularization, the multi-functional technology trends as straight-arm lorry-mounted crane.
Multi-way valve is the core element of straight-arm lorry-mounted crane hydraulic control system, and principle directly determines the property of complete machine
Energy, efficiency, energy consumption and cost.Elevator is that straight-arm lorry-mounted crane operates two most frequent actions with revolution action, such as how
Suitable cost reduces energy consumption, improves the degree of modularity and improves maneuverability, is that those skilled in the art need the skill solved
Art problem.
Patent CN103899588B proposes a kind of straight-arm Multi-way directional valve for lorry-mounted crane, as shown in Figure 1, its feature
For：Using collaborating before valve, the composite move of multiple actions is realized, to use lower cost hydraulic system performance.
But this multiple directional control valve is there are still some technological deficiencies, it is as follows：
1, in general, severe duty needs low speed smooth operations.But when elevator single movement, elevator reversal valve is constantly in
Interflow state, lasting high flow rate oil supply will greatly improve the operating difficulty of manipulator, at the same needed for low-speed motion except it is big
Measuring additional fuel supply flow rate can only be by high pressure kicks oil return, and this also increases system heat generations and vehicle energy consumption；
When 2, carrying out elevator composite move again after revolution action, since the middle position oil return of slewing directional control valve is by unidirectional
Converging valve, elevator reversal valve to multi-way valve oil return opening, elevator action can cause elevator reversal valve inlet pressure to increase, to lead
Position oil return opening, slewing directional control valve inlet pressure in slewing directional control valve is caused accordingly to increase.And raised slewing directional control valve oil inlet
Pressure can increase the fuel feeding to revolution actuator port, it means that revolution action can carry out the moment of composite move operation in elevator
Accelerate.Meanwhile the incrementss of rotational speed are loaded by elevator lift heavy, elevator reversal valve control run and slewing directional control valve manipulate row
Journey codetermines.Here it is the unstable phenomenons of rotational speed after first turning round when the composition operation of elevator, have certain safety
Hidden danger.
A kind of straight-arm Multi-way directional valve for lorry-mounted crane and its control method that patent CN201110169262.7 is proposed,
As shown in Fig. 2, although the action of its elevator has the function of that double speed, elevator reversal valve are five eight logical structure types, five are shared
A working position, eight hydraulic fluid ports, operational stroke is long, spool adjusting stroke is short, oil circuit is complicated, needs special manufacture, there are regulation performances
The problems such as bad, complicated, poor universality, of high cost and maintenance difficult；Simultaneously with elevator composition operation after first turning round
When the unstable phenomenon of rotational speed.
Utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies of existing technologies, and it is more to provide a kind of lorry-mounted crane
Road reversing arrangement.
In order to achieve the above objectives, the utility model provides a kind of lorry-mounted crane multi-way reversing device, including oil inlet oil circuit,
Oil return opening, for operating the raising of amplitude oil cylinder, stopping and drop back into the luffing reversal valve of three kinds of actions, for operating telescopic oil cylinder
Stretching, stopping and three kinds of actions of retracting flexible reversal valves, for operate the rising of hoist motor, stopping and decline three kinds it is dynamic
The elevator reversal valve of work, for operating the forward direction of rotary motor, the slewing directional control valve and function mould of stopping and reverse three kinds of actions
Block, the luffing reversal valve and the flexible reversal valve oil inlet oil circuit in parallel both ends, the slewing directional control valve, the function
Module and the oil inlet oil circuit series connection, the flexible reversal valve and function module interflow after with the elevator reversal valve, described time
Hydraulic fluid port is sequentially connected in series, and the actuator port A3 and actuator port B3 of the elevator reversal valve are respectively communicated with two ports of hoist motor,
The actuator port A1 and actuator port B1 of the luffing reversal valve distinguish external two ports of amplitude oil cylinder, the flexible reversal valve
Actuator port A2 and actuator port B2 is respectively communicated with two ports of telescopic oil cylinder, the actuator port A4 of the slewing directional control valve and
Actuator port B4 is respectively communicated with two accents of rotary motor.
Preferentially, the function module includes interflow check valve, dual-speed control valve, the pre- unloading valve of revolution and dual-speed control valve
Spring cavity controls oil circuit L1, and the oil inlet oil circuit, the slewing directional control valve and the interflow check valve are sequentially connected in series, the double speed
Control valve is connected in the slewing directional control valve between position oil return opening and the oil return opening of the function module, the dual-speed control valve
Control chamber includes dual-speed control valve spring chamber and the non-spring cavity of dual-speed control valve, dual-speed control valve non-spring cavity connection interflow
Check valve oil outlet, the dual-speed control valve spring chamber connection dual-speed control valve spring chamber control oil circuit L1, and the revolution is unloaded in advance
Lotus valve is connected in the slewing directional control valve between position oil return opening and the function module oil return opening, the pre- unloading valve control of revolution
Chamber processed includes turning round pre- unloading valve spring cavity and turning round the pre- non-spring cavity of unloading valve, and the pre- unloading valve spring cavity of revolution is connected to institute
Position oil return opening in slewing directional control valve is stated, the non-spring cavity of the pre- unloading valve of revolution is connected to the slewing directional control valve oil inlet.
Preferentially, the pre- unloading valve of revolution is 2/2-way reversal valve, and the dual-speed control valve controls for 2/2-way
Valve.
Preferentially, the dual-speed control valve spring chamber control oil circuit L1 includes damping hole and unloading overflow valve, the interflow
Check valve oil outlet, the damping hole, the unloading overflow valve, the function module oil return opening be sequentially connected in series, wherein described
Oil circuit node D between damping hole and the unloading overflow valve is connected to the dual-speed control valve spring chamber.
Preferentially, including flexible check valve, elevator rise secondary valve and elevator falls secondary valve, and the elevator rises secondary valve series connection
Between actuator port A3 and oil return opening, the elevator falls secondary valve and is connected between actuator port B3 and oil return opening, described to stretch
Contracting check valve is connected between the oil inlet oil circuit and the flexible reversal valve oil inlet.
Preferentially, including elevator check valve and luffing check valve, the elevator check valve are connected on the flexible reversal valve
Between middle position oil return opening and the elevator reversal valve oil inlet, the luffing check valve is connected on the oil inlet oil circuit and the change
Between width reversal valve oil inlet；Further include stretch big chamber secondary valve and the small chamber secondary valve that stretches, the big chamber secondary valve string that stretches
It is associated between actuator port A2 and the oil return opening, the small chamber secondary valve that stretches is connected on actuator port B2 and the oil return opening
Between.
Preferentially, including the anti-big chamber secondary valve of valve, luffing, the small chamber secondary valve of luffing and the small chamber of luffing of being emptied of the big chamber of luffing is prevented
It is emptied valve, the big chamber secondary valve of luffing is connected between actuator port A1 and oil return opening, the small chamber secondary valve series connection of luffing
Between actuator port B1 and oil return opening, the anti-valve that is emptied of the big chamber of luffing is in parallel with the big chamber secondary valve of the luffing, the change
Small chamber is anti-, and to be emptied valve in parallel with the small chamber secondary valve of luffing.
Preferentially, first oil inlet connection includes the first main overflow valve, the first first pressure oil port P1 and for external pressure
First connection the pressure tap MP1, the first first pressure oil port P1 of power measuring cell are respectively communicated with the luffing reversal valve oil inlet
With the flexible reversal valve oil inlet, the first first pressure oil port P1 connects and is connected to the change after the first main overflow valve
Node between width reversal valve oil return opening and flexible reversal valve oil return opening；Second oil inlet connection includes the second main overflow valve, the
Two first pressure oil port P2 and the second first pressure tap MP2 for external pressure measuring element, the second first pressure oil
Mouthful P2 is connected to the slewing directional control valve oil inlet and the function module oil inlet, the second first pressure oil port P2, described
Oil return opening node between slewing directional control valve and the function module is sequentially connected in series the described second main overflow valve, the oil return opening.
Preferentially, the luffing reversal valve, the flexible reversal valve, the elevator reversal valve, the slewing directional control valve are
Three six logical hand-operated direction valves, the pre- unloading valve of revolution is 2/2-way reversal valve.
Preferentially, further include turning round check valve, the revolution check valve is connected on the oil inlet oil circuit and is changed with the revolution
To between valve oil inlet；Further include the positive secondary valve of revolution and the inverse secondary valve of revolution, the positive secondary valve of revolution is connected on working oil
Between mouth A4 and the oil return opening, the inverse secondary valve of revolution is connected between actuator port B4 and the oil return opening.
The advantageous effect that the utility model is reached：
1, based on the principle collaborated before double quantitative oil pump feeds, elevator valve, luffing and elevator, luffing and revolution is realized, is stretched
With five kinds of elevator, flexible and revolution and revolution and elevator etc. composite moves, composite move can be realized without proportional multi-way valve,
Effectively reduce the cost, improve the cost performance of straight-arm lorry-mounted crane.
2, increase elevator interflow double speed adaptation function, matched well underloading high speed, heavy-duty low-speed duty requirements.
When being lightly loaded operation, energy Dual-pump flow-converging, quickly retracting；In heavily loaded operation, by the automatic Low-pressure load discharge of the second quantitative oil pump, both
The operating difficulty for reducing elevator reversal valve, decreases excess flow, has reached energy-efficient effect.
3, when turning round operation, pre- off-load is carried out by the middle position oil return circuit to slewing directional control valve, revolution is commutated
The middle position oil return circuit of valve is directly connected to oil return opening, elevator reversal valve is no longer pass through, to the volume for avoiding the prior art intrinsic
The jiggly problem of revolution when composite move is raised and turned round, the stationarity of composite move is improved.
What 4, elevator, luffing, flexible and slewing directional control valve were all made of is three six manual multiple-way valves, principle complete one
It causes, by stick control, adjusting spool stroke realizes throttle grverning, meanwhile, by additionally increasing function module, realize conjunction
Stream, double speed are adaptive and turn round the functions such as pre- off-load.These designs have that the degree of modularity is high, simple in structure, versatility is good and
The advantages that at low cost.
Description of the drawings
Fig. 1 is a kind of existing schematic diagram of straight-arm Multi-way directional valve for lorry-mounted crane.
Fig. 2 is the schematic diagram of existing another straight-arm Multi-way directional valve for lorry-mounted crane.
Fig. 3 is the hydraulic principle schematic diagram of an embodiment of the utility model lorry-mounted crane multi-way reversing device.
Mark meaning in attached drawing, the first oil inlets of 1- connection；The first main overflow valves of 11-；2- luffing valve bodies；21- luffing check valves；
22- luffing reversal valves；The big chamber of 23- luffings is anti-to be emptied valve；The big chamber secondary valve of 24- luffings；The small chamber secondary valve of 25- luffings；26- becomes
Small chamber is anti-to be emptied valve；3- stretches valve body；31- stretches check valve；32- stretches reversal valve；33- stretches big chamber secondary valve；34- stretches
Reduce chamber secondary valve；4- elevator valve bodies；41- elevator check valves；42- elevator reversal valves；43- elevators rise secondary valve；44- elevators drop
Secondary valve；5- function modules；51- collaborates check valve；52- dual-speed control valves；53- damping holes；54- unloading overflow valves；55- is returned
Turn pre- unloading valve；6- rotary valve bodies；61- turns round check valve；62- slewing directional control valves；63- turns round positive secondary valve；Inverse time of 64- revolutions
Step valve；The second oil inlets of 7- join；The second main overflow valves of 71-；P1- the first first pressure oil ports；MP1- Firsts join pressure tap； P2-
Second first pressure oil port；MP2- the second first pressure taps；T1, T2- oil return opening；A1, B1- luffing valve body actuator port； A2、
B2- flexible valve body running hydraulic fluid ports；A3, B3- elevator valve body actuator port；A4, B4- rotary valve body actuator port；A5, B5- pair are rolled up
Raise valve body actuator port；C1- turns round pre- 55 oil inlet of unloading valve；C2- turns 55 oil return opening of pre- unloading valve；C3- turns pre- unloading valve 55
Oil outlet；52 spring cavity oil circuit node of D- dual-speed controls valve；52 spring cavity of L1- dual-speed controls valve controls oil circuit.
Specific implementation mode
The utility model is further described below in conjunction with the accompanying drawings, following embodiment is only used for clearly illustrating this
The technical solution of utility model, and the scope of protection of the utility model cannot be limited with this.
A kind of lorry-mounted crane multi-way reversing device, including oil inlet oil circuit, oil return opening, for operating rising for amplitude oil cylinder
The luffing reversal valve 22 for rising, stopping and dropping back into three kinds of actions, stretching, stopping and three kinds of actions of retracting for operating telescopic oil cylinder
Flexible reversal valve 32, for operating the rising of hoist motor, stopping and the elevator reversal valves 42 for declining three kinds of actions, for grasping
Make the forward direction of rotary motor, the slewing directional control valve 62 and function module 5 of stopping and reverse three kinds of actions, the luffing reversal valve 22
With the oil inlet oil circuit in parallel of the flexible reversal valve 32 both ends, the slewing directional control valve 62, the function module 5 and it is described into
Oil circuit is connected, after the flexible reversal valve 32 and the interflow of function module 5 successively with the elevator reversal valve 42, the oil return opening
Series connection, the actuator port A3 and actuator port B3 of the elevator reversal valve 42 are respectively communicated with two ports of hoist motor, the change
The actuator port A1 and actuator port B1 of width reversal valve 22 distinguish external two ports of amplitude oil cylinder, the flexible reversal valve 32
Actuator port A2 and actuator port B2 is respectively communicated with two ports of telescopic oil cylinder, the actuator port A4 of the slewing directional control valve 62
Two accents of rotary motor are respectively communicated with actuator port B4.
Further, the function module 5 includes interflow check valve 51, dual-speed control valve 52, pre- 55 and of unloading valve of revolution
Dual-speed control valve spring chamber control oil circuit L1, the oil inlet oil circuit, the slewing directional control valve 62 and the interflow check valve 51 according to
Secondary series connection, the dual-speed control valve 52 are connected on the oil return of position oil return opening and the function module 5 in the slewing directional control valve 62
Between mouthful, 52 control chamber of dual-speed control valve includes dual-speed control valve spring chamber and the non-spring cavity of dual-speed control valve, described double
Fast control valve non-spring cavity connection interflow 51 oil outlet of check valve, the dual-speed control valve spring chamber are connected to dual-speed control valve spring
Chamber controls oil circuit L1, and the pre- unloading valve 55 that turns round is connected on position oil return opening and the function module in the slewing directional control valve 62
Between 5 oil return openings, pre- 55 control chamber of unloading valve of revolution includes turning round pre- unloading valve spring cavity and the pre- unloading valve non-ballistic of revolution
Spring chamber, the pre- unloading valve spring cavity of revolution are connected to position oil return opening in the slewing directional control valve 62, and the pre- unloading valve of revolution is non-
Spring cavity is connected to 62 oil inlet of slewing directional control valve.
Further, the pre- unloading valve 55 of revolution is 2/2-way reversal valve, and the dual-speed control valve 52 is two two
Logical control valve.
Further, the dual-speed control valve spring chamber control oil circuit L1 includes damping hole 53 and unloading overflow valve 54, institute
State interflow check valve 51 oil outlet, the damping hole 53, the unloading overflow valve 54, the function module 5 oil return opening successively
Series connection, wherein the oil circuit node D between the damping hole 53 and the unloading overflow valve 54 and the dual-speed control valve spring chamber
Connection.
Further, including flexible check valve 31, elevator rise secondary valve 43 and elevator falls secondary valve 44, and the elevator rises secondary
Step valve 43 is connected between actuator port A3 and oil return opening, and the elevator falls secondary valve 44 and is connected on actuator port B3 and oil return opening
Between, the flexible check valve 31 is connected between the oil inlet oil circuit and 32 oil inlet of flexible reversal valve.
Further, including elevator check valve 41 and luffing check valve 21, the elevator check valve 41 are connected on described stretch
In contracting reversal valve 32 between position oil return opening and 42 oil inlet of elevator reversal valve, the luffing check valve 21 be connected on it is described into
Between oil circuit and 22 oil inlet of luffing reversal valve；Further include stretch big chamber secondary valve 33 and the small chamber secondary valve 34 that stretches,
The big chamber secondary valve 33 that stretches is connected between actuator port A2 and the oil return opening, and the flexible small chamber secondary valve 34 is connected
Between actuator port B2 and the oil return opening.
Further, including the big chamber of luffing is prevented being emptied the big chamber secondary valve 24 of valve 23, luffing, the small chamber secondary valve 25 of luffing and be become
Small chamber is anti-to be emptied valve 26, and the big chamber secondary valve of the luffing 24 is connected between actuator port A1 and oil return opening, and the luffing is small
Chamber secondary valve 25 is connected between actuator port B1 and oil return opening, and the big chamber of luffing is anti-to be emptied valve 23 and the big chamber of the luffing
Step valve 24 is in parallel, and the small chamber of luffing is anti-, and to be emptied valve 26 in parallel with the small chamber secondary valve 25 of luffing.
Further, the first oil inlet connection 1 includes the first main overflow valve 11, the first first pressure oil port P1 and is used for outer
First connection the pressure tap MP1, the first first pressure oil port P1 for connecing pressure measuring element are respectively communicated with the luffing reversal valve 22
Oil inlet and 32 oil inlet of flexible reversal valve, the first first pressure oil port P1 connect after the first main overflow valve 11
The node being connected between 32 oil return opening of 22 oil return opening of luffing reversal valve and flexible reversal valve；Second oil inlet joins 7
Second main overflow valve 71, the second first pressure oil port P2 and the second first pressure tap MP2 for external pressure measuring element, institute
It states the second first pressure oil port P2 and is connected to 62 oil inlet of slewing directional control valve and 5 oil inlet of the function module, described second
Oil return opening node between first pressure oil port P2, the slewing directional control valve 62 and the function module 5 is sequentially connected in series described
Two main overflow valves 71, the oil return opening.
Further, the luffing reversal valve 22, the flexible reversal valve 32, the elevator reversal valve 42, the revolution
Reversal valve 62 is three six logical hand-operated direction valves, and the pre- unloading valve 55 of revolution is 2/2-way reversal valve.
Further, further include revolution check valve 61, the revolution check valve 61 be connected on the oil inlet oil circuit with it is described
Between 52 oil inlet of slewing directional control valve；Further include the positive secondary valve 63 of revolution and the inverse secondary valve 64 of revolution, the positive secondary valve of revolution
63 are connected between actuator port A4 and the oil return opening, the inverse secondary valve of the revolution 64 be connected on actuator port B4 with it is described
Between oil return opening.
As shown in figure 3, the hydraulic principle signal of the embodiment for the utility model lorry-mounted crane multi-way reversing device
Figure.In the present embodiment, lorry-mounted crane multi-way reversing device includes：Luffing reversal valve 22, flexible reversal valve 32, elevator commutation
Valve 42, slewing directional control valve 62 and function module 5.Wherein, luffing reversal valve 22 and flexible reversal valve 32 are in parallel on oil inlet oil circuit；
Slewing directional control valve 62 and function module 5 are connected on oil inlet oil circuit；Flexible reversal valve 32 and function module 5 collaborate after with elevator
Reversal valve 42 is connected on oil inlet oil circuit.
Function module 5 for collaborating, turn round the function controls such as pre- off-load and double speed be adaptive, including interflow check valve 51,
Dual-speed control valve 52, damping hole 53, unloading overflow valve 54 and the pre- unloading valve of revolution 55.
It is 2/2-way reversal valve to turn round pre- unloading valve 55, and middle the pre- of position oil return circuit for slewing directional control valve 62 is unloaded
Lotus is connected between the middle position oil return opening of slewing directional control valve 62 and the oil return opening of function module 5, and control chamber has the pre- off-load of revolution
Valve spring chamber and the pre- non-spring cavity two of unloading valve of revolution.Wherein, it turns round in pre- unloading valve spring cavity and slewing directional control valve 62
Position oil return opening connection, turns round the non-spring cavity of pre- unloading valve and is connected to the oil inlet of slewing directional control valve 62.
Dual-speed control valve 52 is 2/2-way control valve, is connected on the middle position oil return opening and function module of slewing directional control valve 62
Between 5 oil return opening, the control chamber of dual-speed control valve 52 has dual-speed control valve spring chamber and the non-spring cavity of dual-speed control valve two.
The non-spring cavity of dual-speed control valve is directly connected to the oil outlet for being connected to interflow check valve 51；Dual-speed control valve spring chamber is by double speed control
Valve spring chamber control oil circuit L1 controls processed, dual-speed control valve spring chamber control oil circuit L1 are to collaborate the oil outlet of check valve 51 through resistance
Buddhist nun hole 53, oil circuit node D, unloading overflow valve 54 to the oil return opening of function module 5, wherein oil circuit node D and dual-speed control valve bullet
Spring chamber is connected to.
Collaborate check valve 51 to be arranged in function module 5, the middle position oil return opening and elevator of unilaterally connected slewing directional control valve 62
The oil inlet of reversal valve 42 realizes fuel feeding of second constant displacement pump to elevator reversal valve 42, and prevents oil circuit from interfering with each other.
Auxiliary plug-in can also be set in the valve body corresponding to each reversal valve come play smooth motion, reduce energy consumption,
The effects that safeguard protection, promotes the control performance of reversal valve.It is illustrated separately below in conjunction with Fig. 3.
42 corresponding valve body 4 of elevator reversal valve is mainly used for the raising and lowering control of elevator.Elevator reversal valve 42 can be adopted
With three six logical hand-operated direction valves, there is the working position of upper, middle and lower three, correspond respectively to the rising, stopping and decline of hoist motor
Three kinds of actions, and operator can rely on handle to carry out manually handle, adjusting spool stroke realizes throttle grverning, controls elevator
The velocity of rotation of motor.
It is additionally provided with elevator liter secondary valve 43 on 42 corresponding valve body 4 of elevator reversal valve and elevator falls secondary valve 44, valve body 4
Actuator port A3 and actuator port B3 distinguish the rising chamber of external hoist motor and decline chamber, and two of elevator reversal valve 42
Actuator port is communicated with the actuator port A3 of valve body 4 and actuator port B3 respectively.Elevator rises secondary valve 43 and is connected on actuator port
Between A3 and oil return opening, and elevator falls secondary valve 44 and is then connected between actuator port B3 and oil return opening.Elevator rises secondary valve 43
It is the auxiliary plug-in in valve body 4 to fall secondary valve 44 with elevator, and the maximum working pressure that can limit hoist motor is no more than volume
Raise the permission pressure of motor.
It is also provided with elevator check valve on oil inlet oil circuit in valve body 4 before the oil inlet of elevator reversal valve 42
41,41 unilaterally connected of elevator check valve stretch reversal valve 32 middle position oil return opening and elevator reversal valve 42 oil inlet, realization
First constant displacement pump can prevent oil circuit from interfering with each other the fuel feeding of valve body 4.
22 corresponding valve body 2 of luffing reversal valve is mainly used for rising, falling control for amplitude oil cylinder.Luffing reversal valve 22 can be used
Three six logical hand-operated direction valves have the working position of upper, middle and lower three, correspond respectively to the raising of amplitude oil cylinder, stop and drop back into three
Kind action, and operator can rely on handle to carry out manually handle, adjusting spool stroke, a part of fluid of the supply of constant displacement pump
Amplitude oil cylinder can be entered by luffing reversal valve 22, other fluid can be with overflow oil return box, and then controls amplitude oil cylinder
Movement velocity.
It is also provided with luffing check valve on oil inlet oil circuit in valve body 2 before the oil inlet of luffing reversal valve 22
21, the oil inlet of luffing check valve 21 unilaterally connected first constant displacement pump and luffing reversal valve 22 realizes big first constant displacement pump pair
The fuel feeding of valve body 2, and can prevent oil circuit from interfering with each other.
Compared with autocrane, straight-arm lorry-mounted crane operating speed is fast, is easy in operation process and startup, stopping
Vibration and impact are generated, arm support can be shaken, overall operation performance is reduced, destroy fluid pressure line, and damage structural member.In order to keep away
Exempt from these problems, the big chamber secondary valve 24 of luffing, luffing small chamber secondary valve can also be set on 22 corresponding valve body 2 of luffing reversal valve
25, the big chamber of luffing prevents that being emptied valve 23 and the small chamber of luffing prevents being emptied valve 26.The actuator port A1 and actuator port B1 difference of valve body 2
The big chamber (i.e. rodless cavity) and small chamber (i.e. rod chamber) of external amplitude oil cylinder, and two actuator ports of luffing reversal valve 22 are distinguished
It is communicated with the actuator port A1 of valve body 2 and actuator port B1.
The big chamber secondary valve of luffing 24 is connected between the actuator port A1 of valve body 2 and the oil return opening of valve body 4, the small chamber of luffing
Step valve 25 is then connected between the actuator port B1 of valve body 2 and the oil return opening of valve body 4, and the big chamber of luffing is anti-to be emptied valve 23 and luffing
Big chamber secondary valve 24 is in parallel, and the small chamber of luffing is anti-, and to be emptied valve 26 in parallel with the small chamber secondary valve 25 of luffing.
The big chamber secondary valve 24 of luffing, the small chamber secondary valve 25 of luffing, the big chamber of luffing prevent that being emptied valve 23 and the small chamber of luffing prevents being emptied
Valve 26 is the auxiliary plug-in in valve body 2, and collective effect improves luffing control performance.In movement and braking process, high pressure oil is allowed
Liquid is overflowed by the big chamber secondary valve 24 of luffing and the small chamber secondary valve 25 of luffing, while oil return fluid is emptied through the big chamber of luffing is anti-
Valve 23 and the small chamber of luffing are prevented being emptied the oil cylinder chamber that valve 26 is directly entered vacuum, prevent the generation of vacuum, avoid multiple hydraulic shock
Generation, to play the role of buffering decompression, to make, luffing action movement is steady, impact is smaller.
The big chamber secondary valve 24 of luffing is antivibration secondary valve, for controlling the big cavity pressure of amplitude oil cylinder, on the one hand in luffing oil
It when cylinder vibrates, is generated heat by overflow, achievees the purpose that vibration damping, pressure is on the other hand set by it, the maximum for limiting luffing rises
Beijing South Maxpower Technology Co. Ltd's power realizes system protection function.The small chamber secondary valve 25 of luffing is antivibration secondary valve, for controlling the small chamber pressure of amplitude oil cylinder
On the one hand power increases pressure oscillation when hydraulic system damping reduces retraction by overflow, on the other hand ensures oil liquid pressure foot
It is enough to retract so that realization is unloaded greatly.
Flexible 32 corresponding valve body 3 of reversal valve is mainly used for the stretching of telescopic oil cylinder, control of retracting.Flexible reversal valve 32
Three six logical hand-operated direction valves can be used, there is the working position of upper, middle and lower three, correspond respectively to telescopic oil cylinder stretching, stop and
It retracts three kinds and acts, and operator can rely on handle to carry out manually handle, adjusting spool stroke realizes throttle grverning, in turn
Control the movement velocity of telescopic oil cylinder.
It is also provided with flexible check valve on oil inlet oil circuit in valve body 3 before the oil inlet of flexible reversal valve 32
31, the oil inlet of flexible check valve 31 unilaterally connected first constant displacement pump and flexible reversal valve 32 realizes the first constant displacement pump to valve
The fuel feeding of body 3, and can prevent oil circuit from interfering with each other.
Flexible big chamber secondary valve 33 can be set and the small chamber secondary valve 34 that stretches, the actuator port A2 of valve body 3 on valve body 3
Distinguish the big chamber (i.e. rodless cavity) and small chamber (i.e. rod chamber) of external telescopic oil cylinder with actuator port B2, and flexible reversal valve 32
Two actuator ports are communicated with the actuator port A2 of valve body 3 and actuator port B2 respectively.The big chamber secondary valve 33 that stretches is connected on work
Make between hydraulic fluid port A2 and the oil return opening of valve body 4, and the small chamber secondary valve 34 that stretches is connected on the oil return of actuator port B2 and valve body 4
Between mouthful.
Big chamber secondary valve 33 and the small chamber secondary valve 34 that stretches stretch for the auxiliary plug-in in valve body 3, for improving flexible control
Function processed.The big chamber secondary valve 33 that stretches is secondary pressure limiting valve, on the one hand the big cavity pressure for limiting telescopic oil cylinder will meet straight
The band of arm lorry-mounted crane carries Telescopic requirement, and on the other hand limitation straight-arm lorry-mounted crane band carries the ability of stretching flexible again
The allowable range of oil cylinder and boom structure protects system.The small chamber secondary valve 34 that stretches also is secondary pressure limiting valve, flexible for limiting
On the one hand the small cavity pressure of oil cylinder reduces pressure oscillation when retracting by overflow increase hydraulic system damping and utilizes load
Dead weight realizes that arm is retracted, and to improve robust motion, reduce energy consumption, on the other hand needs to ensure that oil liquid pressure is sufficiently large,
To realize unloaded retraction.
The oil return opening of function module 5 can be arranged to double back hydraulic fluid port T1 and T2 arranged side by side, and connect oil return circuit to fuel tank.
By the way that instead of a big oil return opening, the vertical area of valve body 5 can be efficiently used, reduces the thickness of valve body 5 double back hydraulic fluid port,
Connecting line specification is reduced simultaneously, can support the piping connection compared with small dimension, is conducive to pipeline arrangement.
62 corresponding valve body 6 of slewing directional control valve is mainly used for the forward direction of revolution, multi channel.Slewing directional control valve 62 can be used
Three six logical hand-operated direction valves have the working position of upper, middle and lower three, correspond respectively to forward direction, the stopping and reverse three of rotary motor
Kind action, and operator can rely on handle to carry out manually handle, adjusting spool stroke realizes throttle grverning, and then controls back
Turn the movement velocity of motor.
It is also provided with revolution check valve on oil inlet oil circuit in valve body 6 before the oil inlet of slewing directional control valve 62
61, the oil inlet of revolution check valve 61 unilaterally connected second constant displacement pump and slewing directional control valve 52 realizes the second constant displacement pump to valve
The fuel feeding of body 6, and can prevent oil circuit from interfering with each other.
The positive secondary valve 63 of revolution and the inverse secondary valve 64 of revolution, the actuator port A4 of valve body 6 and work can be set on valve body 6
Hydraulic fluid port B4 distinguishes the positive chamber of external rotary motor and reverse chamber, and two actuator ports of slewing directional control valve 62 respectively with valve body
6 actuator port A4 and actuator port B4 is communicated.Turn round positive secondary valve 63 be connected on actuator port A4 and valve body 6 oil return opening it
Between, and turn round inverse secondary valve 64 and be connected between actuator port B4 and the oil return opening of valve body 6.It turns round positive secondary valve 63 and turns round inverse
Secondary valve 64 is the auxiliary plug-in in valve body 6, and the maximum working pressure for limiting rotary motor allows to press no more than motor
Power.
Luffing reversal valve 22, flexible reversal valve 32, elevator reversal valve 42, function module 5 and revolution mentioned above is changed
Can be superimposed assembling in order to 62 corresponding valve body 2-6 of valve, and can both sides be separately installed with the first oil inlet connection 1 and second into
Oil connection 2, to provide oil inlet oil circuit and safety protection function.
First oil inlet connection 1 includes the first main overflow valve 11, first pressure hydraulic fluid port P1 and the first pressure tap MP1.Wherein, first
Pressure oil port P1 is communicated with the oil inlet oil circuit of luffing reversal valve 22 and flexible reversal valve 32, and can external first constant displacement pump；First
Pressure tap MP1 can external pressure measuring element, oil circuit pressure is monitored；The setting of first main overflow valve 11 is in first pressure oil
Between mouth P1 and luffing reversal valve 22 and the oil return circuit of flexible reversal valve 32, overload protection may be implemented, limitation luffing stretches
And the maximum pressure of elevator.
Second oil inlet connection 7 includes the second main overflow valve 71, second pressure hydraulic fluid port P2 and the second pressure tap MP2.Wherein, second
Pressure oil port P2 is communicated with the oil inlet oil circuit of slewing directional control valve 62 and function module 5, and can external second constant displacement pump；Second pressure measurement
Mouthful MP2 can external pressure measuring element, oil circuit pressure is monitored；Second main overflow valve 71 is arranged in second pressure hydraulic fluid port P2
Between slewing directional control valve 62 and the oil return circuit of function module 5, overload protection may be implemented, limit the maximum pressure of revolution.
The lorry-mounted crane multi-way reversing device of the utility model may be implemented luffing and elevator, luffing and revolution, stretch
With elevator, flexible and revolution and multiple composite moves such as revolution and elevator；Also the pre- unloading function of revolution can be realized, in back rotation
When making, the middle position oil return opening of slewing directional control valve is connected to multi-way valve oil return opening, no longer through position oil return circuit in elevator reversal valve
Oil return improves the stationarity of compound motion to avoid elevator from moving the interference to rotary motion；Also it can realize that double speed is adaptive
Function is answered, in elevator single movement, according to lift heavy load automatically into underloading high speed or heavy-duty low-speed pattern, that is, is being lightly loaded
When operation, the first constant displacement pump and the second constant displacement pump collaborate fuel feeding, to realize quickly movement；In heavily loaded operation, the second constant displacement pump
Low-pressure load discharge, the only first quantitative oil pump feed so as to improve maneuverability, and reduce energy consumption to realize microinching.Its operation principle
It is specific as follows：
1, composite move：When luffing or it is flexible have action when, the first constant displacement pump is corresponding through the P1 supplies of first pressure hydraulic fluid port
The oil circuit of reversal valve, first pressure hydraulic fluid port P1 to elevator check valve 41 disconnects.At this point, the second constant displacement pump is through second pressure hydraulic fluid port P2
Valve body 6, valve body 5 and valve body 4 are supplied, to realize luffing and elevator, luffing and revolution, flexible and elevator and flexible and revolution
Totally four composite moves.
When revolution acts, the second constant displacement pump supplies slewing directional control valve 62 through second pressure hydraulic fluid port P2, collaborates check valve 51
Prevent first pressure hydraulic fluid port P1 to the oil circuit of slewing directional control valve 62, at this point, the first constant displacement pump is supplied through first pressure hydraulic fluid port P1
Valve body 2, valve body 3 and valve body 4, to realize revolution and elevator, revolution and flexible and revolution and luffing totally three composite moves.
Remove the composite move repeated, amount to luffing and elevator, luffing and revolution, it is flexible with elevator, it is flexible with revolution with
And five kinds of revolution and elevator etc..
2, double speed is adaptive：When luffing, flexible and revolution attonity, only elevator loads operation, i.e. elevator reversal valve 42
Inlet pressure level is less than the spring setup pressure value of unloading overflow valve 54, then unloading overflow valve 54 is not turned on, and L1 oil circuits are not turned on,
Dual-speed control valve spring chamber is identical as the pressure of the non-spring cavity of dual-speed control valve.Therefore, dual-speed control valve 52 is in left position work
Position, dual-speed control valve 52 end.At this point, the first constant displacement pump through first pressure hydraulic fluid port P1, luffing reversal valve 22 middle position oil return line,
The middle position oil return line and elevator check valve 41 of flexible reversal valve 32 are to 42 fuel feeding of elevator reversal valve, and the second constant displacement pump is through second
Pressure oil port P2, the middle position oil return line of slewing directional control valve 62, interflow check valve 51 are to 42 fuel feeding of elevator reversal valve.Two constant displacement pumps
Fluid collaborate before the oil inlet of elevator reversal valve 42, realize underloading high speed.
When luffing, flexible and revolution attonity, only elevator heavy duty operation, the i.e. inlet pressure level of elevator reversal valve 42 are higher than
The spring setup pressure value of unloading overflow valve 54, unloading overflow valve 54 are connected, then L1 oil circuits are also switched on, and form interflow check valve 51
Oil outlet, damping hole 53, unloading overflow valve 54 to 5 oil return opening of function module fluid flowing.Due to the damping of damping hole 53
Effect, 53 both ends of damping hole form pressure difference namely D presses force value and is less than 51 exit pressure levels of unidirectional converging valve.And dual-speed control
52 spring cavity of valve is equal with the pressure value difference that unidirectional converging valve 51 exports with D points with non-spring cavity.Under oil liquid pressure effect,
Dual-speed control valve 52 is operated in right position, and dual-speed control valve 52 is connected.At this point, the first constant displacement pump is through first pressure hydraulic fluid port P1, luffing
The middle position oil return line of reversal valve 22, the middle position oil return line of flexible reversal valve 32 and elevator check valve 41 are supplied to elevator reversal valve 42
Oil, the second constant displacement pump is through second pressure hydraulic fluid port P2, the middle position oil return line of slewing directional control valve 62, dual-speed control valve 52 to function module
5 oil return opening realizes Low-pressure load discharge.Interflow check valve 51 prevents the pressure oil liquid of the first constant displacement pump to dual-speed control valve 52
Flowing, to realize heavy-duty low-speed.
3, pre- off-load is turned round：When revolution attonity, slewing directional control valve 62 are located at middle position, the non-ballistic of pre- unloading valve 55 is turned round
Spring chamber is connected to the oil inlet of slewing directional control valve 62, and turns round the spring cavity of pre- unloading valve 55 and the middle position of slewing directional control valve 62
Oil return opening is connected to.The pressure difference turned round between the non-spring cavity of pre- unloading valve 55 and spring cavity is only that the first constant displacement pump fluid flows through valve
The pressure loss of block 6, less than the spring setup pressure value for turning round pre- unloading valve 55.At this point, turning round pre- unloading valve 55 in spring force
Under the action of be operated in left position, turn round pre- unloading valve 55 cut-off.First constant displacement pump is through second pressure hydraulic fluid port P2, slewing directional control valve 62
To interflow 51 oil inlet of check valve.
When revolution action, slewing directional control valve 62 open certain stroke, a part of fluid of the second constant displacement pump is to A4 or B4
Fuel feeding, rest part flow to the middle position oil return opening of slewing directional control valve 62.Due to the restriction effect of itself of slewing directional control valve 62, returning
Turn to form certain pressure difference between the oil inlet of reversal valve 62 and middle position oil return opening, that is, turn round the non-spring cavity of pre- unloading valve 55 and returns
Turn to form certain pressure difference between the spring cavity of pre- unloading valve 55, this pressure difference sets pressure higher than the spring for turning round pre- unloading valve 55
Value.Therefore, it turns round pre- unloading valve 55 and is operated in right position, turn round the conducting of pre- unloading valve 55.At this point, the middle position of slewing directional control valve 62 is returned
Hydraulic fluid port is connected to through turning round pre- unloading valve 55 with the oil return opening of function module 5, finally realizes position oil return circuit in slewing directional control valve
Pre- off-load, avoid elevator action to revolution act return pressure interference.
Above-mentioned the utility model lorry-mounted crane multi-way reversing device embodiment is suitably applied in straight-arm lorry-mounted crane,
And the straight-arm lorry-mounted crane for using lorry-mounted crane multi-way reversing device embodiment above-mentioned can be realized at lower cost
Collaborate control form before valve, and realize double speed adaptively with the pre- off-load of oil return, improves the operating efficiency of vehicle, and reduce energy
Consumption improves smooth operation.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
The scope of protection of the utility model is also should be regarded as into deformation.
Claims (10)
1. a kind of lorry-mounted crane multi-way reversing device, which is characterized in that including oil inlet oil circuit, oil return opening, for operating luffing
The raising of oil cylinder, the luffing reversal valve (22) for stopping and dropping back into three kinds of actions, stretching, stopping and contracting for operating telescopic oil cylinder
The flexible reversal valve (32) for returning three kinds of actions is changed for operating the elevator of three kinds of rising, stopping and decline actions of hoist motor
To valve (42), for operating the forward direction of rotary motor, the slewing directional control valve (62) and function module of stopping and reverse three kinds of actions
(5), the luffing reversal valve (22) and the flexible reversal valve (32) the oil inlet oil circuit in parallel both ends, the slewing directional control valve
(62), behind the function module (5) and oil inlet oil circuit series connection, the flexible reversal valve (32) and function module (5) interflow
It is sequentially connected in series with the elevator reversal valve (42), the oil return opening, the actuator port A3 of the elevator reversal valve (42) and work
Hydraulic fluid port B3 is respectively communicated with two ports of hoist motor, the actuator port A1 and actuator port B1 difference of the luffing reversal valve (22)
Two ports of external amplitude oil cylinder, flexible reversal valve (32) the actuator port A2 and actuator port B2 are respectively communicated with telescopic oil cylinder
Two ports, the actuator port A4 and actuator port B4 of the slewing directional control valve (62) are respectively communicated with two chambers of rotary motor
Mouthful.
2. a kind of lorry-mounted crane multi-way reversing device according to claim 1, which is characterized in that the function module
(5) include interflow check valve (51), dual-speed control valve (52), the pre- unloading valve (55) of revolution and dual-speed control valve spring chamber control oil
Road (L1), the oil inlet oil circuit, the slewing directional control valve (62) and the interflow check valve (51) are sequentially connected in series, the double speed control
Valve (52) processed is connected in the slewing directional control valve (62) between position oil return opening and the oil return opening of the function module (5), described
Dual-speed control valve (52) control chamber includes dual-speed control valve spring chamber and the non-spring cavity of dual-speed control valve, and the dual-speed control valve is non-
Spring cavity connection interflow check valve (51) oil outlet, the dual-speed control valve spring chamber connection dual-speed control valve spring chamber control oil
Road (L1), the pre- unloading valve (55) of revolution are connected on position oil return opening and the function module in the slewing directional control valve (62)
(5) between oil return opening, pre- unloading valve (55) control chamber of revolution includes turning round pre- unloading valve spring cavity and the pre- unloading valve of revolution
Non- spring cavity, the pre- unloading valve spring cavity of revolution are connected to position oil return opening in the slewing directional control valve (62), and the revolution is unloaded in advance
The non-spring cavity of lotus valve is connected to slewing directional control valve (62) oil inlet.
3. a kind of lorry-mounted crane multi-way reversing device according to claim 2, which is characterized in that the pre- off-load of revolution
Valve (55) is 2/2-way reversal valve, and the dual-speed control valve (52) is 2/2-way control valve.
4. a kind of lorry-mounted crane multi-way reversing device according to claim 2, which is characterized in that the dual-speed control valve
It includes damping hole (53) and unloading overflow valve (54), interflow check valve (51) oil outlet, institute that spring cavity, which controls oil circuit (L1),
State damping hole (53), the unloading overflow valve (54), the function module (5) oil return opening be sequentially connected in series, wherein the damping
Oil circuit node D between hole (53) and the unloading overflow valve (54) is connected to the dual-speed control valve spring chamber.
5. a kind of lorry-mounted crane multi-way reversing device according to claim 1, which is characterized in that including the check valve that stretches
(31), elevator rises secondary valve (43) and elevator falls secondary valve (44), and the elevator rises secondary valve (43) and is connected on actuator port A3
Between oil return opening, the elevator falls secondary valve (44) and is connected between actuator port B3 and oil return opening, the flexible check valve
(31) it is connected between the oil inlet oil circuit and the flexible reversal valve (32) oil inlet.
6. a kind of lorry-mounted crane multi-way reversing device according to claim 1, which is characterized in that including elevator check valve
(41) and luffing check valve (21), the elevator check valve (41) are connected on position oil return opening and institute in the flexible reversal valve (32)
Between stating elevator reversal valve (42) oil inlet, the luffing check valve (21) is connected on the oil inlet oil circuit and commutates with the luffing
Between valve (22) oil inlet；Further include stretch big chamber secondary valve (33) and small chamber secondary valve (34) of stretching, the big chamber that stretches
Step valve (33) is connected between actuator port A2 and the oil return opening, and the small chamber secondary valve (34) of stretching is connected on actuator port
Between B2 and the oil return opening.
7. a kind of lorry-mounted crane multi-way reversing device according to claim 1, which is characterized in that anti-including the big chamber of luffing
The big chamber secondary valve (24) of valve (23), luffing, the small chamber secondary valve (25) of luffing and the small chamber of luffing is emptied to prevent being emptied valve (26), the change
The big chamber secondary valve (24) of width is connected between actuator port A1 and oil return opening, and the small chamber secondary valve (25) of luffing is connected on work
Between hydraulic fluid port B1 and oil return opening, the anti-valve (23) that is emptied of the big chamber of luffing is in parallel with the luffing big chamber secondary valve (24), described
The small chamber of luffing is anti-, and to be emptied valve (26) in parallel with luffing small chamber secondary valve (25).
8. a kind of lorry-mounted crane multi-way reversing device according to claim 1, which is characterized in that the oil inlet oil circuit packet
The first oil inlet connection (1) and the second oil inlet connection (7) are included, the first oil inlet connection (1) includes the first main overflow valve (11), the first first
Pressure oil port (P1) and for external pressure measuring element First connection pressure tap (MP1), the first first pressure oil port (P1)
It is respectively communicated with luffing reversal valve (22) oil inlet and the flexible reversal valve (32) oil inlet, the first first pressure oil
Mouth (P1) the series connection first main overflow valve (11) is connected to luffing reversal valve (22) oil return opening and flexible reversal valve (32) afterwards
Node between oil return opening；Second oil inlet connection (7) include the second main overflow valve (71), the second first pressure oil port (P2) and
For the second first pressure tap (MP2) of external pressure measuring element, the second first pressure oil port (P2) connection is described to return
Turn reversal valve (62) oil inlet and the function module (5) oil inlet, the second first pressure oil port (P2), the revolution are changed
To the oil return opening node between valve (62) and the function module (5) be sequentially connected in series the described second main overflow valve (71), described time
Hydraulic fluid port.
9. a kind of lorry-mounted crane multi-way reversing device according to claim 2, which is characterized in that the luffing reversal valve
(22), the flexible reversal valve (32), the elevator reversal valve (42), the slewing directional control valve (62) lead to for three six changes manually
To valve, the pre- unloading valve (55) of revolution is 2/2-way reversal valve.
10. a kind of lorry-mounted crane multi-way reversing device according to claim 2, which is characterized in that further include that revolution is single
To valve (61), the revolution check valve (61) is connected between the oil inlet oil circuit and the slewing directional control valve (52) oil inlet；
Further include the positive secondary valve (63) of revolution and the inverse secondary valve (64) of revolution, the positive secondary valve (63) of revolution is connected on actuator port A4
Between the oil return opening, the inverse secondary valve (64) of revolution is connected between actuator port B4 and the oil return opening.
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| CN201721312852.XU CN207750302U (en) | 2017-10-12 | 2017-10-12 | A kind of lorry-mounted crane multi-way reversing device |
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| CN201721312852.XU CN207750302U (en) | 2017-10-12 | 2017-10-12 | A kind of lorry-mounted crane multi-way reversing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504000A (en) * | 2017-10-12 | 2017-12-22 | 徐州徐工随车起重机有限公司 | A kind of lorry-mounted crane multi-way reversing device |
| CN114195046A (en) * | 2021-12-14 | 2022-03-18 | 浙江三一装备有限公司 | Multifunctional forklift hydraulic control system and multifunctional forklift |
| CN114718934A (en) * | 2022-05-07 | 2022-07-08 | 徐州徐工随车起重机有限公司 | Multi-way valve and force limit integrated operation control system |
-
2017
- 2017-10-12 CN CN201721312852.XU patent/CN207750302U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504000A (en) * | 2017-10-12 | 2017-12-22 | 徐州徐工随车起重机有限公司 | A kind of lorry-mounted crane multi-way reversing device |
| CN107504000B (en) * | 2017-10-12 | 2024-01-02 | 徐州徐工随车起重机有限公司 | Multi-way reversing device of lorry-mounted crane |
| CN114195046A (en) * | 2021-12-14 | 2022-03-18 | 浙江三一装备有限公司 | Multifunctional forklift hydraulic control system and multifunctional forklift |
| CN114718934A (en) * | 2022-05-07 | 2022-07-08 | 徐州徐工随车起重机有限公司 | Multi-way valve and force limit integrated operation control system |
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