CN103836020B - The high-low pressure switching system of a kind of concrete pump and concrete pump - Google Patents
The high-low pressure switching system of a kind of concrete pump and concrete pump Download PDFInfo
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- CN103836020B CN103836020B CN201410106939.6A CN201410106939A CN103836020B CN 103836020 B CN103836020 B CN 103836020B CN 201410106939 A CN201410106939 A CN 201410106939A CN 103836020 B CN103836020 B CN 103836020B
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Abstract
The invention discloses high-low pressure switching system and the concrete pump of a kind of concrete pump, including: 4 reversal valves and 2 inserted valves；3rd actuator port of the first reversal valve and the 4th actuator port are connected with the first actuator port and second actuator port of the 4th reversal valve respectively, and the 3rd actuator port and the 4th actuator port of the 4th reversal valve are connected with the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder respectively；3rd actuator port of the second reversal valve and the 4th actuator port are connected with the first actuator port and second actuator port of the 3rd reversal valve respectively, and the 3rd actuator port and the 4th actuator port of the 3rd reversal valve are connected with the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder respectively.The system of the present invention and concrete pump, it is possible to promote the efficiency of construction of concrete pump, reduce the construction intensity of workman, promote the overall performance of concrete pump, and the spring failure in reversal valve can be avoided in frequent commutation work, it is ensured that car load normally works.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to the height crush-cutting of a kind of concrete pump
Change system and concrete pump.
Background technology
At present, the manufacturer of external concrete pump, the most German general thatch maistre and Shi Weiying
Deng, in pumping technology, hydraulic technique, test and the field such as manufacture defines more perfect system,
Research in concrete pump field and technological innovation lead the development of world's pumping technology always.Example
As, Putzmeister Inc. just have developed the technology of being pumped by, wherein Burj Dubai before more than ten years
(512 meters) are exactly the outstanding achievement that Putzmeister Inc. is pumped by.The development of domestic concrete pump
Starting late, through the effort of decades, domestic concrete pump achieves significant progress, especially
Breakthrough is achieved in hydraulic system and the aspect such as pumping system, Control System Design.At present, domestic
The manufacturer of concrete pump, such as Xu work Shi Weiying, 31 heavy industrys, Zhong Lianchong section etc. possess
The ability that contends with overseas enterprise.Quick through nearly 10 years of commerical ready-mixed concrete complete set of equipments
Development, market has tended to ripe, and market gradually tends to rationality to concrete pumping equipment demand, visitor
Product cost, use cost, profitability, product operation adaptability etc. are required increasingly by family
High.Along with the development of society, skyscraper is more and more universal, rising for ours of skyscraper
Concrete pumping industry provides new development opportunity, also brings new challenge.But, at present
Concrete pump the most all there are two master cylinders, it is contemplated that the citing of pumping and height, generally make
Force down discharge capacity two ways with low pressure huge discharge and height concrete is pumped, existing concrete
Also often there is leakage in pump high-low pressure switching hydraulic system structure in design complexity, installation difficulty
The faults such as oil, inefficacy, make concrete mixer car load to work.
Summary of the invention
In view of this, the technical problem that the invention solves the problems that is to provide the height of a kind of concrete pump
Low pressure switched system and concrete pump, it is possible to efficiently solve the problems referred to above.
A kind of high-low pressure switching system of concrete pump, including: the first reversal valve, the second commutation
Valve, the 3rd reversal valve, the 4th reversal valve, the first inserted valve and the second inserted valve；Described first changes
Connect oil-feed respectively to the first actuator port of valve and the first actuator port of described second reversal valve to lead to
Road；Second actuator port of described first reversal valve and the second actuator port of described second reversal valve
Connect drainback passage respectively；3rd actuator port and the 4th actuator port of described first reversal valve divide
Not being connected with the first actuator port and second actuator port of described 4th reversal valve, the described 4th changes
To the 3rd actuator port of valve and the 4th actuator port respectively with the rodless cavity of the first oil cylinder and described
The rodless cavity of two oil cylinders is connected；First actuator port of described second inserted valve and the second actuator port
Rodless cavity with the rodless cavity of the first oil cylinder and described second oil cylinder is connected respectively；Described second commutation
3rd actuator port of valve and the 4th actuator port respectively with the first working oil of described 3rd reversal valve
Mouth and the second actuator port connect, the 3rd actuator port of described 3rd reversal valve and the 4th working oil
Mouth rod chamber with the rod chamber of the first oil cylinder and described second oil cylinder respectively is connected；Described first inserts
Dress the first actuator port of valve and the second actuator port respectively with the rod chamber of the first oil cylinder and described the
The rod chamber of two oil cylinders is connected.
According to one embodiment of present invention, further, described first reversal valve and the second commutation
Valve is 3-position 4-way hydraulicchange-over valve, and wherein, described 3-position 4-way hydraulicchange-over valve includes for right
Spool carries out the spring resetted.
According to one embodiment of present invention, further, described 3rd reversal valve and the described 4th
Reversal valve is two four-way pilot operated directional control valves.
According to one embodiment of present invention, further, also include for described oil-feed path
The plunger displacement pump of middle input pressure oil.
According to one embodiment of present invention, further, at described first reversal valve, second change
Under the state that the spool of valve is positioned at middle position, described first reversal valve, the of described second reversal valve
One working port, the second working port, the 3rd working port and the 4th working port are not connected.
According to one embodiment of present invention, further, when low pressure pumps, described
The spool of the first reversal valve is positioned at middle position, and described first inserted valve is closed, and described second inserted valve is beaten
Open, when the spool of described second reversal valve be in left position, described 3rd reversal valve be in right position time,
Pressure oil sequentially passes through the first actuator port of described second reversal valve and the 3rd actuator port, described
First actuator port of the 3rd reversal valve and the 3rd actuator port enter the rod chamber of the first oil cylinder, push away
The piston movement of dynamic described first oil cylinder；Pressure oil in the rodless cavity of described first oil cylinder is through institute
State the first actuator port of the second inserted valve and the second actuator port enter described second oil cylinder without bar
Chamber, promotes the piston movement of described second oil cylinder；Pressure oil in the rod chamber of described second oil cylinder
Sequentially pass through the 4th actuator port of described 3rd reversal valve and the second actuator port, described second change
Drainback passage is entered to the 4th actuator port and second actuator port of valve；When described second reversal valve
Spool be in left position, described 3rd reversal valve is when being in left position, pressure oil sequentially passes through described
First actuator port of two reversal valves and the 3rd actuator port, the first work of described 3rd reversal valve
Hydraulic fluid port and the 4th actuator port enter the rod chamber of the second oil cylinder, promote the piston of described second oil cylinder
Motion；Pressure oil in the rodless cavity of described second oil cylinder is through the second work of described second inserted valve
Make hydraulic fluid port and the rodless cavity of the first actuator port described first oil cylinder of entrance, promote described first oil cylinder
Piston movement；Pressure oil in the rod chamber of described first oil cylinder sequentially passes through described 3rd commutation
3rd actuator port of valve and the second actuator port, the 4th actuator port of described second reversal valve and
Second actuator port enters drainback passage.
According to one embodiment of present invention, further, when being pumped by, described
The spool of the second reversal valve is positioned at middle position, and described first inserted valve is opened, and described second inserted valve closes
Close, when the spool of described first reversal valve be in left position, the spool of described 4th reversal valve is in the right side
During position, pressure oil sequentially passes through the first actuator port and the 3rd working oil of described first reversal valve
Mouth, the first actuator port of described 4th reversal valve and the 3rd actuator port enter the nothing of the first oil cylinder
Bar chamber, promotes the piston movement of described first oil cylinder；Pressure in the rod chamber of described first oil cylinder
Oil enters described second oil through the first actuator port and second actuator port of described first inserted valve
The rod chamber of cylinder, promotes the piston movement of described second oil cylinder；In the rodless cavity of described second oil cylinder
Pressure oil sequentially pass through the 4th actuator port and the second actuator port, the institute of described 4th reversal valve
The 4th actuator port and the second actuator port of stating the first reversal valve enter drainback passage；When described
When the spool of one reversal valve is in left position, described 4th reversal valve is in left position, pressure oil warp successively
Cross the first actuator port of described first reversal valve and the 3rd actuator port, described 4th reversal valve
First actuator port and the 4th actuator port enter the rodless cavity of the second oil cylinder, promote described second oil
The piston movement of cylinder；Pressure oil in the rod chamber of described second oil cylinder is through described first inserted valve
The second actuator port and the first actuator port enter the rod chamber of described first oil cylinder, promote described
The piston movement of the first oil cylinder；Pressure oil in the rodless cavity of described first oil cylinder sequentially passes through described
3rd actuator port of the 4th reversal valve and the second actuator port, the 4th work of described first reversal valve
Make hydraulic fluid port and the second actuator port enters drainback passage.
A kind of concrete pump, including the high-low pressure switching system of concrete pump as above.
The high-low pressure switching system of the concrete pump of the present invention and concrete pump, it is possible to make concrete
Pump the most easily realizes low pressure to the switching of high pressure or high pressure to the switching of low pressure, thus carries
Rise the efficiency of construction of concrete pump, reduce the construction intensity of workman, promote the globality of concrete pump
Can, and the spring failure in reversal valve can be avoided in frequent commutation work, it is ensured that car load is just
Often work.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, aobvious and easy
Insight, the accompanying drawing in describing below is only some embodiments of the present invention, common for this area
From the point of view of technical staff, on the premise of not paying creative work, it is also possible to according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is showing of an embodiment of the high-low pressure switching system of the concrete pump according to the present invention
It is intended to.
Detailed description of the invention
With reference to the accompanying drawings the present invention is described more fully, the example of the present invention is wherein described
Property embodiment.Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the skill in the embodiment of the present invention
Art scheme is clearly and completely described, it is clear that described embodiment is only the present invention one
Section Example rather than whole embodiments.Based on the embodiment in the present invention, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise, all
Belong to the scope of protection of the invention.
" first ", " second " in the present invention etc., for distinguishing on describing, other is not special
Implication.
As it is shown in figure 1, the high-low pressure switching system of concrete pump includes: the first reversal valve 1,
Two reversal valve the 2, the 3rd reversal valve the 3, the 4th reversal valve the 4, first inserted valve 5 and the second inserted valves
6.According to one embodiment of present invention, first reversal valve the 1, second reversal valve the 2, the 3rd commutation
Valve the 3, the 4th reversal valve 4 can also be all guiding valve.
First actuator port P of the first reversal valve 1 and the first actuator port of the second reversal valve 2
P2 connects oil-feed path respectively.Oil-feed path can be total oil-feed path or the independence of concrete pump
Oil-feed path.Second actuator port T of the first reversal valve 1 and the second work of the second reversal valve 2
Make hydraulic fluid port T2 and connect drainback passage respectively.
The 3rd actuator port A and the 4th actuator port B of the first reversal valve 1 change with the 4th respectively
Connect to the first actuator port P4 and the second actuator port T4 of valve 4, the 4th reversal valve 4
3rd actuator port A4 and the 4th actuator port B4 respectively with the rodless cavity and of the first oil cylinder 8
The rodless cavity of two oil cylinders 7 is connected.First actuator port X2 of the second inserted valve 6 and second work
Hydraulic fluid port Y2 is connected with the rodless cavity of the first oil cylinder 8 and the rodless cavity of the second oil cylinder 7 respectively.
3rd actuator port of the second reversal valve 2 and the 4th actuator port respectively with the 3rd reversal valve 3
The first actuator port and the second actuator port connect, the 3rd actuator port of the 3rd reversal valve 3
A3 and the 4th actuator port B3 respectively with the rod chamber of the first oil cylinder 8 and the first oil cylinder 7 have bar
Chamber is connected.The first actuator port X1 and the second actuator port Y1 of the first inserted valve 5 respectively with
The rod chamber of the first oil cylinder 8 and the rod chamber of the second oil cylinder 7 are connected.
The high-low pressure switching system of the concrete pump of the present invention include four reversal valves (or guiding valve),
Two inserted valves.Reversal valve is the direction control with two or more liquid form and two or more hydraulic fluid port
Valve processed.It is to realize the communication of hydraulic oil flow, cut off and commutate, and discharge degree and sequentially-operating
The valve controlled.First reversal valve the 1, second reversal valve 2 can be that 3-position 4-way surges commutation
Valve, two ends band spring, conventional sense the first reversal valve the 1, second reversal valve 2 is in middle position, and two
When guiding valve is in middle position, P, T, A, B are not connected.3rd reversal valve the 3, the 4th reversal valve
4 is two four-way pilot operated directional control valves, and two ends are without spring.
Concrete pump is a kind of energy conversion dress that hydraulic energy is converted to flowing concrete pressure energy
Put.The first oil cylinder 8 and the second oil cylinder 7 in the present invention are all master cylinder, are a kind of by hydraulic energy
Being converted to the energy conversion device of mechanical energy, master cylinder is connected to concrete piston, can be by hydraulic pressure
The kinetic energy (potential energy) of concrete can be converted to.Low pressure pumping refers to that working solution force feed enters master cylinder
Rod chamber promotes the state of master cylinder work.Be pumped by referring to working solution force feed enter master cylinder without
Bar chamber promotes the state of master cylinder work.
According to one embodiment of present invention, when low pressure pumps, the first reversal valve 1
Spool is positioned at middle position, and the first inserted valve 5 is closed, and the second inserted valve 6 is opened, when the second reversal valve
When the spool of 2 is in left position, the 3rd reversal valve 3 is in right position, pressure oil sequentially passes through second and changes
To the first actuator port P2 and the 3rd actuator port, first work of the 3rd reversal valve 3 of valve 2
Hydraulic fluid port and the 3rd actuator port A3 enter the rod chamber of the first oil cylinder 8, promote the first oil cylinder 8
Piston movement.
Pressure oil in the rodless cavity of the first oil cylinder 8 is through the first actuator port of the second inserted valve 6
X2 and the second actuator port Y2 enters the rodless cavity of the second oil cylinder 7, promotes the work of the second oil cylinder 7
Plug motion.Pressure oil in the rod chamber of the second oil cylinder 7 sequentially passes through the 4th of the 3rd reversal valve 3
Actuator port B3 and the second actuator port, the 4th actuator port of the second reversal valve 2 and the second work
Make hydraulic fluid port T2 and enter drainback passage.
When the spool of the second reversal valve 2 be in left position, the 3rd reversal valve 3 be in left position time, pressure
Oil sequentially passes through the first actuator port P2 of the second reversal valve 2 and the 3rd actuator port, the 3rd changes
The rod chamber of the second oil cylinder 7 is entered to the first actuator port of valve 3 and the 4th actuator port B3,
Promote the piston movement of the second oil cylinder 7.
Pressure oil in the rodless cavity of the second oil cylinder 7 is through the second actuator port of the second inserted valve 6
Y2 and the first actuator port X2 enters the rodless cavity of the first oil cylinder 8, promotes the work of the first oil cylinder 8
Plug motion.Pressure oil in the rod chamber of the first oil cylinder 8 sequentially passes through the 3rd of the 3rd reversal valve 3
Actuator port A3 and the second actuator port, the 4th actuator port of the second reversal valve 2 and the second work
Make hydraulic fluid port T2 and enter drainback passage.
According to one embodiment of present invention, when being pumped by, the second reversal valve 2
Spool is positioned at middle position, and the first inserted valve 5 is opened, and the second inserted valve 6 is closed, when the first reversal valve
When the spool of 1 is in left position, the spool of the 4th reversal valve 4 is in right position, pressure oil sequentially passes through
The first actuator port P and the 3rd actuator port A of the first reversal valve 1, the of the 4th reversal valve 4
One actuator port P4 and the 3rd actuator port A4 enters the rodless cavity of the first oil cylinder 8, promotes the
The piston movement of one oil cylinder 8.
Pressure oil in the rod chamber of the first oil cylinder 8 is through the first actuator port of the first inserted valve 5
X1 and the second actuator port Y1 enters the rod chamber of the second oil cylinder 7, promotes the work of the second oil cylinder 7
Plug motion.Pressure oil in the rodless cavity of the second oil cylinder 7 sequentially passes through the 4th of the 4th reversal valve 4
Actuator port B4 and the second actuator port T4, the 4th actuator port B of the first reversal valve 1 and
Two actuator port T enter drainback passage.
When the spool of the first reversal valve 1 be in left position, the 4th reversal valve 4 be in left position time, pressure
Oil sequentially passes through the first actuator port P and the 3rd actuator port A of the first reversal valve 1, the 4th changes
To the first actuator port P4 and the 4th actuator port B4 of valve 4 enter the second oil cylinder 7 without bar
Chamber, promotes the piston movement of the second oil cylinder 7.
Pressure oil in the rod chamber of the second oil cylinder 7 is through the second actuator port of the first inserted valve 5
Y1 and the first actuator port X1 enters the rod chamber of the first oil cylinder 8, promotes the work of the first oil cylinder 8
Plug motion.Pressure oil in the rodless cavity of the first oil cylinder 8 sequentially passes through the 3rd of the 4th reversal valve 3
Actuator port A4 and the second actuator port T4, the 4th actuator port B of the first reversal valve 1 and
Second actuator port T enters drainback passage.
According to one embodiment of present invention, the first reversal valve 1 and the second reversal valve 2 are three four
Logical hydraulicchange-over valve, 3-position 4-way hydraulicchange-over valve includes the spring for resetting spool.
3rd reversal valve 3 and the 4th reversal valve 4 are two four-way pilot operated directional control valves.System include for
The oil pump of input pressure oil, such as plunger displacement pump in oil-feed path.
According to one embodiment of present invention, when low pressure pumping state, when hydraulic fluid port P11,
During P12, P21, P22 equal no pressure oil effect, hydraulic oil is awaited orders at P mouth, when hydraulic fluid port P21,
When P32 has pressure oil effect, valve 2 will be in left position, and the 3rd reversal valve 3 is in right position, hydraulic oil
Through the second reversal valve 2 to the 3rd reversal valve 3, through the 3rd reversal valve 3 to the first oil cylinder 8 loculus with
At first inserted valve 5, when hydraulic fluid port P5 has pressure oil effect, the first inserted valve 5 is closed, high
Force feed enters the first oil cylinder 8 loculus, promotes cylinder movement, the first big cavity pressure oil effect of oil cylinder 8
In the second inserted valve the 6, first reversal valve 4 and the first reversal valve 1.
Hydraulic fluid port P11, P12 no pressure oil effect, the first reversal valve 1 cuts out, when hydraulic fluid port P6 without
During pressure oil effect, the first reversal valve 6 is opened, and the first oil cylinder 8 big cavity pressure oil is through the second plug-in mounting
Valve 6 enters the second big chamber of oil cylinder 7, promotes the second oil cylinder 7 to move, the second little cavity pressure of oil cylinder 7
Oil acts on the first inserted valve the 5, the 3rd reversal valve 3 and the second reversal valve 2, the first inserted valve 5
Closing, the pressure oil of the second oil cylinder 7 loculus is through the 3rd reversal valve 3 to the second reversal valve 2, through the
Two reversal valve 2 to T mouths.When hydraulic fluid port P31 actuating pressure oil, the 3rd reversal valve 3 is in a left side
Position, hydraulic oil enters the second oil cylinder 7 loculus through valve the 2, the 3rd reversal valve 3, after cyclic process
Ibid, second oil cylinder the 7, first oil can be realized when hydraulic fluid port P31, P32 alternating action pressure oil
Cylinder 8 moves continuously, it is achieved low pressure pumps.
When being pumped by state, when hydraulic fluid port P11, P12, P21, P22 equal no pressure oil effect
Time, hydraulic oil is awaited orders at P mouth, when hydraulic fluid port P11, P42 have pressure oil effect, and the first commutation
Valve 1 will be in left position, and the 4th reversal valve 4 is in right position, and hydraulic oil is through the first reversal valve 1 to
Four reversal valves 4, at the 4th big chamber of reversal valve 4 to the first oil cylinder 8 with the second inserted valve 6, when
When hydraulic fluid port P6 has pressure oil effect, the second inserted valve 6 is closed, and hydraulic oil enters the first oil cylinder 8
Big chamber, promotes cylinder movement.
First oil cylinder 8 loculus pressure oil acts on the first inserted valve the 5, the 3rd reversal valve 3 and second
Reversal valve 2, hydraulic fluid port P21, P22 no pressure oil effect, the second reversal valve 2 cuts out, and works as hydraulic fluid port
During P5 no pressure oil effect, the first inserted valve 5 is opened, and the first oil cylinder 8 loculus pressure oil is through
One inserted valve 5 enters the second oil cylinder 7 loculus, promotes the second oil cylinder 7 to move, and the second oil cylinder 7 is big
Cavity pressure oil acts on the second inserted valve the 6, the 4th reversal valve 4 and the first reversal valve 1, and second inserts
Dress valve 6 cuts out, and the second big cavity pressure of oil cylinder 7 is oily through the 4th reversal valve 4 to the first reversal valve 1,
Through the first reversal valve 1 to T mouth, when hydraulic fluid port P41 actuating pressure oil, at the 4th reversal valve 4
Yu Zuowei, hydraulic oil enters the second big chamber of oil cylinder 7 through the first reversal valve the 1, the 4th reversal valve 4,
Cyclic process below ibid, can realize the first oil when hydraulic fluid port P41, P42 alternating action pressure oil
Cylinder the 7, second oil cylinder 8 moves continuously, it is achieved be pumped by.
During the high-low pressure switching system work of the concrete pump of the present invention, the first reversal valve valve 1, the
Two reversal valves 2 there is one to necessarily be in middle position.Low pressure pumping state: hydraulic fluid port P21, P5 or
P22, P5 actuating pressure always oil, hydraulic fluid port P31, P32 alternating action hydraulic oil, hydraulic fluid port
P11, P12, P6 not actuating pressure oil.The state being pumped by: hydraulic fluid port P11, P6 or
P12, P6 actuating pressure always oil, hydraulic fluid port P41, P42 alternating action hydraulic oil, hydraulic fluid port
P21, P22, P5 not actuating pressure oil.In the high-low pressure switching system of the concrete pump of the present invention
The pressure oil effect of the hydraulic fluid port of each valve or do not act on, and the operation such as the opening and closing of the port of each valve
By controlling device control realization.
According to one embodiment of present invention, a kind of concrete pump includes that concrete pump as above is high
Low pressure switching hydraulic system.
The high-low pressure switching system of the concrete pump of the present invention and concrete pump, it is possible to make concrete
Pump the most easily realizes low pressure to the switching of high pressure or high pressure to the switching of low pressure, thus carries
Rise the efficiency of construction of concrete pump, reduce the construction intensity of workman, promote the globality of concrete pump
Can, and the spring failure in reversal valve can be avoided in frequent commutation work, it is ensured that car load is just
Often work.
Arbitrary technical scheme disclosed in the invention described above unless otherwise stated, if it discloses
Numerical range, then disclosed numerical range is preferred numerical range, any this area
Skilled artisans appreciated that: preferably numerical range is only technology in many enforceable numerical value
The numerical value that effectiveness comparison is obvious or representative.Owing to numerical value is more, it is impossible to exhaustive, so
The present invention just open component values to illustrate technical scheme, and, above-mentioned row
The numerical value lifted should not constitute the restriction to the invention protection domain.
Meanwhile, if the invention described above discloses or relate to parts or the knot of connection fastened to each other
Component, then, unless otherwise stated, fixing connection is it is to be understood that can releasably fix
Connect (such as using bolt or screw to connect), it is understood that for: non-removable fixing
Connecting (such as rivet, weld), certainly, connection fastened to each other can also be integral type structure
(such as use casting technique is integrally formed manufacture) is replaced (substantially cannot be used integrally
Except forming technology).
It addition, being used for applied in arbitrary technical scheme disclosed in the invention described above represents position
The term of relation or shape its implication unless otherwise stated includes approximating with it, similar or close
State or shape.The either component that the present invention provides both can be by multiple single ingredients
Assemble, it is also possible to the separate part that the technique that is one of the forming manufactures.
Finally should be noted that: above example only in order to technical scheme to be described and
Non-to its restriction；Although the present invention being described in detail with reference to preferred embodiment, affiliated
The those of ordinary skill in field is it is understood that still can enter the detailed description of the invention of the present invention
Row is revised or portion of techniques feature is carried out equivalent；Without deviating from technical solution of the present invention
Spirit, it all should be contained in the middle of the technical scheme scope that the present invention is claimed.
Claims (8)
1. the high-low pressure switching system of a concrete pump, it is characterised in that including:
First reversal valve (1), the second reversal valve (2), the 3rd reversal valve (3), the 4th reversal valve
(4), the first inserted valve (5) and the second inserted valve (6)；The of described first reversal valve (1)
First actuator port of one actuator port and described second reversal valve (2) connects oil-feed respectively and leads to
Road；Second actuator port of described first reversal valve (1) and the of described second reversal valve (2)
Two actuator ports connect drainback passage respectively；
3rd actuator port of described first reversal valve (1) and the 4th actuator port are respectively with described
First actuator port of the 4th reversal valve (4) and the second actuator port connect, described 4th commutation
3rd actuator port of valve (4) and the 4th actuator port respectively with the rodless cavity of the first oil cylinder (8)
It is connected with the rodless cavity of the second oil cylinder (7)；First actuator port of described second inserted valve (6)
With the second actuator port respectively with the rodless cavity of the first oil cylinder (8) and described second oil cylinder (7)
Rodless cavity is connected；
3rd actuator port of described second reversal valve (2) and the 4th actuator port are respectively with described
First actuator port of the 3rd reversal valve (3) and the second actuator port connect, described 3rd commutation
3rd actuator port of valve (3) and the 4th actuator port respectively with the rod chamber of the first oil cylinder (8)
It is connected with the rod chamber of described second oil cylinder (7)；First work of described first inserted valve (5)
Hydraulic fluid port and the second actuator port respectively with the rod chamber of the first oil cylinder (8) and described second oil cylinder
(7) rod chamber is connected.
2. the system as claimed in claim 1, it is characterised in that:
Described first reversal valve (1) and the second reversal valve (2) are 3-position 4-way hydraulicchange-over valve,
Wherein, described 3-position 4-way hydraulicchange-over valve includes the spring for resetting spool.
3. system as claimed in claim 2, it is characterised in that:
Described 3rd reversal valve (3) and described 4th reversal valve (4) are two four-way liquid controlled reversings
Valve.
4. system as claimed in claim 3, it is characterised in that:
Also include the plunger displacement pump for the oil of input pressure in described oil-feed path.
5. system as claimed in claim 4, it is characterised in that:
The state of middle position it is positioned at described first reversal valve (1), the spool of the second reversal valve (2)
Under, described first reversal valve (1), the first working port of described second reversal valve (2),
Two working ports, the 3rd working port and the 4th working port are not connected.
6. system as claimed in claim 5, it is characterised in that:
When low pressure pumps, the spool of described first reversal valve (1) is positioned at middle position, institute
Stating the first inserted valve (5) to close, described second inserted valve (6) is opened, when described second commutates
When the spool of valve (2) is in left position, described 3rd reversal valve (3) is in right position, pressure oil depends on
Secondary the first actuator port through described second reversal valve (2) and the 3rd actuator port, described
First actuator port and the 3rd actuator port of three reversal valves (3) enter having of the first oil cylinder (8)
Bar chamber, promotes the piston movement of described first oil cylinder (8)；Described first oil cylinder (8) without bar
Pressure oil in chamber is through the first actuator port of described second inserted valve (6) and the second working oil
Mouth enters the rodless cavity of described second oil cylinder (7), promotes the piston of described second oil cylinder (7) to transport
Dynamic；Pressure oil in the rod chamber of described second oil cylinder (7) sequentially passes through described 3rd reversal valve
(3) the 4th actuator port and the second actuator port, the 4th work of described second reversal valve (2)
Make hydraulic fluid port and the second actuator port enters drainback passage；
When the spool of described second reversal valve (2) is in left position, described 3rd reversal valve (3) place
When left position, pressure oil sequentially passes through first actuator port and of described second reversal valve (2)
Three actuator ports, the first actuator port of described 3rd reversal valve (3) and the 4th actuator port enter
Enter the rod chamber of the second oil cylinder (7), promote the piston movement of described second oil cylinder (7)；Described
Pressure oil in the rodless cavity of the second oil cylinder (7) is through the second work of described second inserted valve (6)
Make hydraulic fluid port and the first actuator port and enter the rodless cavity of described first oil cylinder (8), promote described the
The piston movement of one oil cylinder (8)；Pressure oil in the rod chamber of described first oil cylinder (8) is successively
Through the 3rd actuator port of described 3rd reversal valve (3) and the second actuator port, described second
4th actuator port of reversal valve (2) and the second actuator port enter drainback passage.
7. system as claimed in claim 6, it is characterised in that:
When being pumped by, the spool of described second reversal valve (2) is positioned at middle position, institute
Stating the first inserted valve (5) to open, described second inserted valve (6) is closed, when described first commutates
When the spool of valve (1) is in left position, the spool of described 4th reversal valve (4) is in right position, pressure
Power oil sequentially pass through the first actuator port of described first reversal valve (1) and the 3rd actuator port,
First actuator port and the 3rd actuator port of described 4th reversal valve (4) enter the first oil cylinder
(8) rodless cavity, promotes the piston movement of described first oil cylinder (8)；Described first oil cylinder
(8) the pressure oil in rod chamber through described first inserted valve (5) the first actuator port and
Second actuator port enters the rod chamber of described second oil cylinder (7), promotes described second oil cylinder
(7) piston movement；Pressure oil in the rodless cavity of described second oil cylinder (7) sequentially passes through institute
State the 4th actuator port and the second actuator port, described first reversal valve of the 4th reversal valve (4)
(1) the 4th actuator port and the second actuator port enter drainback passage；
When the spool of described first reversal valve (1) is in left position, described 4th reversal valve (4) place
When left position, pressure oil sequentially passes through first actuator port and of described first reversal valve (1)
Three actuator ports, the first actuator port of described 4th reversal valve (4) and the 4th actuator port enter
Enter the rodless cavity of the second oil cylinder (7), promote the piston movement of described second oil cylinder (7)；Described
Pressure oil in the rod chamber of the second oil cylinder (7) is through the second work of described first inserted valve (5)
Make hydraulic fluid port and the first actuator port and enter the rod chamber of described first oil cylinder (8), promote described the
The piston movement of one oil cylinder (8)；Pressure oil in the rodless cavity of described first oil cylinder (8) is successively
Through the 3rd actuator port of described 4th reversal valve (3) and the second actuator port, described first
4th actuator port of reversal valve (1) and the second actuator port enter drainback passage.
8. a concrete pump, it is characterised in that:
High-low pressure including the concrete pump as described in claim 1 to 7 any one switches system
System.
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| CN201410106939.6A CN103836020B (en) | 2014-03-21 | 2014-03-21 | The high-low pressure switching system of a kind of concrete pump and concrete pump |
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| CN201410106939.6A CN103836020B (en) | 2014-03-21 | 2014-03-21 | The high-low pressure switching system of a kind of concrete pump and concrete pump |
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| CN103836020A CN103836020A (en) | 2014-06-04 |
| CN103836020B true CN103836020B (en) | 2016-09-14 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930153A (en) * | 2015-06-26 | 2015-09-23 | 黄泽明 | Hydraulic control speed change device and method and hydraulic mud pump with speed change device |
| CN111322281A (en) * | 2020-03-04 | 2020-06-23 | 徐州徐工施维英机械有限公司 | High-low voltage automatic switching control logic device, system and control method thereof |
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| CN103836020A (en) | 2014-06-04 |
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