CN103836020A - High pressure and low pressure switching system of concrete pump and concrete pump - Google Patents
High pressure and low pressure switching system of concrete pump and concrete pump Download PDFInfo
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- CN103836020A CN103836020A CN201410106939.6A CN201410106939A CN103836020A CN 103836020 A CN103836020 A CN 103836020A CN 201410106939 A CN201410106939 A CN 201410106939A CN 103836020 A CN103836020 A CN 103836020A
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Abstract
The invention discloses a high pressure and low pressure switching system of a concrete pump and the concrete pump. The high pressure and low pressure switching system comprises four reversing valves and two cartridge valves. A third working oil port and a fourth working oil port of the first reversing valve are connected with a first working oil port and a second working oil port of the fourth reversing valve respectively, and a third working oil port and a fourth working oil port of the fourth reversing valve are connected with a rodless cavity of a first oil cylinder and a rodless cavity of a second oil cylinder respectively. A third working oil port and a fourth working oil port of the second reversing valve are connected with a first working oil port and a second working oil port of the third reversing valve respectively, and a third working oil port and a fourth working oil port of the third reversing valve are connected with a rod cavity of the first oil cylinder and a rod cavity of the second oil cylinder respectively. According to the system and the concrete pump, the construction efficiency of the concrete pump can be enhanced, the construction intensity of workers is reduced, the overall performance of the concrete pump is improved, springs in the reversing valves can be prevented from being out of operation during the frequent reversing working, and the normal working of a whole vehicle is guaranteed.
Description
Technical field
The present invention relates to technical field of engineering machinery, relate in particular to a kind of high-low pressure switching system and concrete pump of concrete pump.
Background technique
At present, the manufacturer of external concrete pump, such as German general thatch maistre and Shi Weiying etc., formed more perfect system in fields such as pumping technology, hydraulics, test and manufactures, leading the development of world's pumping technology in the research in concrete pump field and technological innovation always.For example, Putzmeister Inc. has has just researched and developed high-pressure service pump feed technique before more than ten years, and wherein Burj Dubai (512 meters) are exactly the outstanding achievement of Putzmeister Inc.'s high pressure pumping.The development of domestic concrete pump is started late, and through the effort of decades, domestic concrete pump has been obtained significant progress, has especially obtained breakthrough at the aspect such as hydraulic system and pumping system, Control System Design.At present, the manufacturer of domestic concrete pump, such as Xu work Shi Weiying, 31 heavy industrys, Zhong Lianchong section etc. have possessed the ability contending with overseas enterprise.The fast development of nearly 10 years of commerical ready-mixed concrete complete sets of equipment process, it is ripe that market has been tending towards, and market is tending towards rationality gradually to concrete pumping equipment demand, and client requires more and more higher to product cost performance, user cost, profitability, product operation adaptability etc.Along with social development, tall building is more and more general, and the concrete pumping industry that the rise of tall building is for we provides new development opportunity, has also brought new challenge.But, current concrete pump generally all has two master cylinders, consider giving an example and height of pumping, conventionally use the large discharge capacity of low pressure and height to force down two kinds of modes of discharge capacity concrete is carried out to pumping, existing concrete pump with high-low pressure switching hydraulic system in design complex structure, install difficulty and often there is the fault such as leakage of oil, inefficacy, concrete mixer car load cannot be worked.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of high-low pressure switching system and concrete pump of concrete pump, can effectively address the above problem.
A high-low pressure switching system for concrete pump, comprising: the first selector valve, the second selector valve, the 3rd selector valve, the 4th selector valve, the first cartridge valve and the second cartridge valve; The first actuator port of described the first selector valve is connected respectively oil-feed path with the first actuator port of described the second selector valve; The second actuator port of described the first selector valve is connected respectively drainback passage with the second actuator port of described the second selector valve; The 3rd actuator port of described the first selector valve is connected with the first actuator port and second actuator port of described the 4th selector valve respectively with the 4th actuator port, and the 3rd actuator port of described the 4th selector valve is connected with the rodless cavity of described the second oil cylinder with the rodless cavity of the first oil cylinder respectively with the 4th actuator port; The first actuator port of described the second cartridge valve is connected with the rodless cavity of described the second oil cylinder with the rodless cavity of the first oil cylinder respectively with the second actuator port; The 3rd actuator port of described the second selector valve is connected with the first actuator port and second actuator port of described the 3rd selector valve respectively with the 4th actuator port, and the 3rd actuator port of described the 3rd selector valve is connected with the rod chamber of described the second oil cylinder with the rod chamber of the first oil cylinder respectively with the 4th actuator port; The first actuator port of described the first cartridge valve is connected with the rod chamber of described the second oil cylinder with the rod chamber of the first oil cylinder respectively with the second actuator port.
According to one embodiment of present invention, further, described the first selector valve and the second selector valve are 3-position 4-way hydraulicchange-over valve, and wherein, described 3-position 4-way hydraulicchange-over valve comprises the spring for spool is resetted.
According to one embodiment of present invention, further, described the 3rd selector valve and described the 4th selector valve are two four-way pilot operated directional control valves.
According to one embodiment of present invention, further, also comprise for the plunger pump to described oil-feed path incoming pressure oil.
According to one embodiment of present invention, further, be positioned under the state of meta at the spool of described the first selector valve, the second selector valve, the first working port, the second working port, the 3rd working port and the 4th working port of described the first selector valve, described the second selector valve are not connected.
According to one embodiment of present invention, further, under the state of low pressure pumping, the spool of described the first selector valve is positioned at meta, described the first cartridge valve is closed, described the second cartridge valve is opened, when the spool of described the second selector valve in left position, described the 3rd selector valve is during in right position, pressure oil enters the rod chamber of the first oil cylinder successively through the first actuator port of the first actuator port of described the second selector valve and the 3rd actuator port, described the 3rd selector valve and the 3rd actuator port, promote the piston movement of described the first oil cylinder; The first actuator port of described the second cartridge valve of pressure oil process in the rodless cavity of described the first oil cylinder and the second actuator port enter the rodless cavity of described the second oil cylinder, promote the piston movement of described the second oil cylinder; Pressure oil in the rod chamber of described the second oil cylinder enters drainback passage through the 4th actuator port and second actuator port of the 4th actuator port of described the 3rd selector valve and the second actuator port, described the second selector valve successively; When the spool of described the second selector valve in left position, described the 3rd selector valve is during in left position, pressure oil enters the rod chamber of the second oil cylinder successively through the first actuator port of the first actuator port of described the second selector valve and the 3rd actuator port, described the 3rd selector valve and the 4th actuator port, promote the piston movement of described the second oil cylinder; The second actuator port of described the second cartridge valve of pressure oil process in the rodless cavity of described the second oil cylinder and the first actuator port enter the rodless cavity of described the first oil cylinder, promote the piston movement of described the first oil cylinder; Pressure oil in the rod chamber of described the first oil cylinder enters drainback passage through the 4th actuator port and second actuator port of the 3rd actuator port of described the 3rd selector valve and the second actuator port, described the second selector valve successively.
According to one embodiment of present invention, further, under the state of high pressure pumping, the spool of described the second selector valve is positioned at meta, described the first cartridge valve is opened, described the second cartridge valve is closed, when the spool of described the first selector valve spool in left position, described the 4th selector valve is during in right position, pressure oil enters the rodless cavity of the first oil cylinder successively through the first actuator port of the first actuator port of described the first selector valve and the 3rd actuator port, described the 4th selector valve and the 3rd actuator port, promote the piston movement of described the first oil cylinder; The first actuator port of described the first cartridge valve of pressure oil process in the rod chamber of described the first oil cylinder and the second actuator port enter the rod chamber of described the second oil cylinder, promote the piston movement of described the second oil cylinder; Pressure oil in the rodless cavity of described the second oil cylinder enters drainback passage through the 4th actuator port and second actuator port of the 4th actuator port of described the 4th selector valve and the second actuator port, described the first selector valve successively; When the spool of described the first selector valve in left position, described the 4th selector valve is during in left position, pressure oil enters the rodless cavity of the second oil cylinder successively through the first actuator port of the first actuator port of described the first selector valve and the 3rd actuator port, described the 4th selector valve and the 4th actuator port, promote the piston movement of described the second oil cylinder; The second actuator port of described the first cartridge valve of pressure oil process in the rod chamber of described the second oil cylinder and the first actuator port enter the rod chamber of described the first oil cylinder, promote the piston movement of described the first oil cylinder; Pressure oil in the rodless cavity of described the first oil cylinder enters drainback passage through the 4th actuator port and second actuator port of the 3rd actuator port of described the 4th selector valve and the second actuator port, described the first selector valve successively.
A kind of concrete pump, comprises the high-low pressure switching system of concrete pump as above.
The high-low pressure switching system of concrete pump of the present invention and concrete pump, can make concrete pump easily realize at short notice the switching that low pressure arrives low pressure to switching or the high pressure of high pressure, thereby promote the efficiency of construction of concrete pump, reduction workman's construction intensity, promote the overall performance of concrete pump, and can in frequent commutation work, avoid the spring failure in selector valve, assurance car load is normally worked.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the high-low pressure switching system of concrete pump of the present invention embodiment's schematic diagram.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
" first ", " second " etc. in the present invention distinguishes on describing, not other special implication.
As shown in Figure 1, the high-low pressure switching system of concrete pump comprises: the first selector valve 1, the second selector valve 2, the 3rd selector valve 3, the 4th selector valve 4, the first cartridge valve 5 and the second cartridge valve 6.According to one embodiment of present invention, the first selector valve 1, the second selector valve 2, the 3rd selector valve 3, the 4th selector valve 4 can be also all guiding valve.
The first actuator port P of the first selector valve 1 is connected respectively oil-feed path with the first actuator port P2 of the second selector valve 2.Oil-feed path can be total oil-feed path of concrete pump or oil-feed path independently.The second actuator port T of the first selector valve 1 is connected respectively drainback passage with the second actuator port T2 of the second selector valve 2.
The 3rd actuator port A of the first selector valve 1 is connected with the first actuator port P4 and the second actuator port T4 of the 4th selector valve 4 respectively with the 4th actuator port B, and the 3rd actuator port A4 of the 4th selector valve 4 is connected with the rodless cavity of the second oil cylinder 7 with the rodless cavity of the first oil cylinder 8 respectively with the 4th actuator port B4.The first actuator port X2 of the second cartridge valve 6 is connected with the rodless cavity of the second oil cylinder 7 with the rodless cavity of the first oil cylinder 8 respectively with the second actuator port Y2.
The 3rd actuator port of the second selector valve 2 is connected with the first actuator port and second actuator port of the 3rd selector valve 3 respectively with the 4th actuator port, and the 3rd actuator port A3 of the 3rd selector valve 3 is connected with the rod chamber of the first oil cylinder 7 with the rod chamber of the first oil cylinder 8 respectively with the 4th actuator port B3.The first actuator port X1 of the first cartridge valve 5 is connected with the rod chamber of the second oil cylinder 7 with the rod chamber of the first oil cylinder 8 respectively with the second actuator port Y1.
The high-low pressure switching system of concrete pump of the present invention comprises four selector valves (or guiding valve), two cartridge valves.Selector valve is to have two or more liquid forms and the position control valve of more than two hydraulic fluid port.Communication, cut-out and the commutation that realizes hydraulic oil stream, and the valve of discharge degree and sequentially-operating control.The first selector valve 1, the second selector valve 2 can be 3-position 4-way hydraulicchange-over valve, two ends band spring, and conventional state the first selector valve 1, the second selector valve 2 be in meta, and two guiding valves are in the time of meta, and P, T, A, B are not connected.The 3rd selector valve 3, the 4th selector valve 4 are two four-way pilot operated directional control valves, and two ends are without spring.
Concrete pump is a kind of energy conversion device that hydraulic energy is converted to flowing concrete pressure energy.The first oil cylinder 8 and the second oil cylinder 7 in the present invention are all master cylinder, are a kind of energy conversion devices that hydraulic energy is converted to mechanical energy, and master cylinder is connecting concrete piston, hydraulic energy can be converted to concrete kinetic energy (potential energy).Low pressure pumping refers to that working solution force feed enters the state of master cylinder rod chamber promotion master cylinder work.High pressure pumping refers to that working solution force feed enters the state of master cylinder rodless cavity promotion master cylinder work.
According to one embodiment of present invention, under the state of low pressure pumping, the spool of the first selector valve 1 is positioned at meta, the first cartridge valve 5 is closed, the second cartridge valve 6 is opened, when the spool of the second selector valve 2 in left position, the 3rd selector valve 3 is during in right position, pressure oil enters the rod chamber of the first oil cylinder 8 successively through the first actuator port of the first actuator port P2 of the second selector valve 2 and the 3rd actuator port, the 3rd selector valve 3 and the 3rd actuator port A3, promote the piston movement of the first oil cylinder 8.
Pressure oil in the rodless cavity of the first oil cylinder 8 enters the rodless cavity of the second oil cylinder 7 through the first actuator port X2 of the second cartridge valve 6 and the second actuator port Y2, promote the piston movement of the second oil cylinder 7.Pressure oil in the rod chamber of the second oil cylinder 7 enters drainback passage through the 4th actuator port and the second actuator port T2 of the 4th actuator port B3 of the 3rd selector valve 3 and the second actuator port, the second selector valve 2 successively.
When the spool of the second selector valve 2 in left position, the 3rd selector valve 3 is during in left position, pressure oil enters the rod chamber of the second oil cylinder 7 successively through the first actuator port of the first actuator port P2 of the second selector valve 2 and the 3rd actuator port, the 3rd selector 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 enters the rodless cavity of the first oil cylinder 8 through the second actuator port Y2 of the second cartridge valve 6 and the first actuator port X2, promote the piston movement of the first oil cylinder 8.Pressure oil in the rod chamber of the first oil cylinder 8 enters drainback passage through the 4th actuator port and the second actuator port T2 of the 3rd actuator port A3 of the 3rd selector valve 3 and the second actuator port, the second selector valve 2 successively.
According to one embodiment of present invention, under the state of high pressure pumping, the spool of the second selector valve 2 is positioned at meta, the first cartridge valve 5 is opened, the second cartridge valve 6 is closed, when the spool of the first selector valve 1 spool in left position, the 4th selector valve 4 is during in right position, pressure oil enters the rodless cavity of the first oil cylinder 8 successively through the first actuator port P4 of the first actuator port P of the first selector valve 1 and the 3rd actuator port A, the 4th selector valve 4 and the 3rd actuator port A4, promote the piston movement of the first oil cylinder 8.
Pressure oil in the rod chamber of the first oil cylinder 8 enters the rod chamber of the second oil cylinder 7 through the first actuator port X1 of the first cartridge valve 5 and the second actuator port Y1, promote the piston movement of the second oil cylinder 7.Pressure oil in the rodless cavity of the second oil cylinder 7 enters drainback passage through the 4th actuator port B and the second actuator port T of the 4th actuator port B4 of the 4th selector valve 4 and the second actuator port T4, the first selector valve 1 successively.
When the spool of the first selector valve 1 in left position, the 4th selector valve 4 is during in left position, pressure oil enters the rodless cavity of the second oil cylinder 7 successively through the first actuator port P4 of the first actuator port P of the first selector valve 1 and the 3rd actuator port A, the 4th selector valve 4 and the 4th actuator port B4, promote the piston movement of the second oil cylinder 7.
Pressure oil in the rod chamber of the second oil cylinder 7 enters the rod chamber of the first oil cylinder 8 through the second actuator port Y1 of the first cartridge valve 5 and the first actuator port X1, promote the piston movement of the first oil cylinder 8.Pressure oil in the rodless cavity of the first oil cylinder 8 enters drainback passage through the 4th actuator port B and the second actuator port T of the 3rd actuator port A4 of the 4th selector valve 3 and the second actuator port T4, the first selector valve 1 successively.
According to one embodiment of present invention, the first selector valve 1 and the second selector valve 2 are 3-position 4-way hydraulicchange-over valve, and 3-position 4-way hydraulicchange-over valve comprises the spring for spool is resetted.The 3rd selector valve 3 and the 4th selector valve 4 are two four-way pilot operated directional control valves.System for example comprises, for the oil pump to oil-feed path incoming pressure oil, plunger pump.
According to one embodiment of present invention, in the time of low pressure pumping state, as hydraulic fluid port P11, P12, P21, P22 all does the used time without pressure oil, high pressure oil is awaited orders at P mouth, as hydraulic fluid port P21, P32 has pressure oil to make used time valve 2 will be in left position, the 3rd selector valve 3 is in right position, high pressure oil through the second selector valve 2 to the 3rd selector valve 3, through the 3rd selector valve 3 to first oil cylinder 8 loculuses and the first cartridge valve 5 places, when having pressure oil, hydraulic fluid port P5 does the used time, the first cartridge valve 5 is closed, high pressure oil enters the first oil cylinder 8 loculuses, promote cylinder movement, the large cavity pressure oil of the first oil cylinder 8 acts on the second cartridge valve 6, the first selector valve 4 and the first selector valve 1.
Hydraulic fluid port P11, P12 are without pressure oil effect, the first selector valve 1 cuts out, when hydraulic fluid port, P6 does the used time without pressure oil, the first selector valve 6 is opened, and the large cavity pressure oil of the first oil cylinder 8 enters the second large chamber of oil cylinder 7 through the second cartridge valve 6, promotes the second oil cylinder 7 and moves, the second oil cylinder 7 loculus pressure oils act on the first cartridge valve 5, the 3rd selector valve 3 and the second selector valve 2, the first cartridge valve 5 is closed, and the pressure oil of the second oil cylinder 7 loculuses is through the 3rd selector valve 3 to second selector valves 2, through the second selector valve 2 to T mouths.In the time of hydraulic fluid port P31 actuating pressure oil, the 3rd selector valve 3 is in left position, high pressure oil enters the second oil cylinder 7 loculuses through valve 2, the 3rd selector valve 3, cyclic process is the same below, in the time of hydraulic fluid port P31, P32 alternating action pressure oil, can realize the second oil cylinder 7, the first oil cylinder 8 moves continuously, realizes low pressure pumping.
In the time of high pressure pumping state, when hydraulic fluid port P11, P12, P21, P22 all do the used time without pressure oil, high pressure oil is awaited orders at P mouth, does the used time when hydraulic fluid port P11, P42 have pressure oil, the first selector valve 1 will be in left position, the 4th selector valve 4 is in right position, high pressure oil through the first selector valve 1 to the 4th selector valve 4, through the 4th selector valve 4 to the first large chamber of oil cylinder 8 and the second cartridge valve 6 places, when having pressure oil, hydraulic fluid port P6 does the used time, the second cartridge valve 6 is closed, and high pressure oil enters the first large chamber of oil cylinder 8, promotes cylinder movement.
The first oil cylinder 8 loculus pressure oils act on the first cartridge valve 5, the 3rd selector valve 3 and the second selector valve 2, hydraulic fluid port P21, P22 is without pressure oil effect, the second selector valve 2 cuts out, when hydraulic fluid port, P5 does the used time without pressure oil, the first cartridge valve 5 is opened, the first oil cylinder 8 loculus pressure oils enter the second oil cylinder 7 loculuses through the first cartridge valve 5, promoting the second oil cylinder 7 moves, the large cavity pressure oil of the second oil cylinder 7 acts on the second cartridge valve 6, the 4th selector valve 4 and the first selector valve 1, the second cartridge valve 6 is closed, the large cavity pressure oil of the second oil cylinder 7 is through the 4th selector valve 4 to first selector valves 1, through the first selector valve 1 to T mouth, in the time of hydraulic fluid port P41 actuating pressure oil, the 4th selector valve 4 is in left position, high pressure oil is through the first selector valve 1, the 4th selector valve 4 enters the second large chamber of oil cylinder 7, cyclic process is the same below, as hydraulic fluid port P41, when P42 alternating action pressure oil, can realize the first oil cylinder 7, the second oil cylinder 8 moves continuously, realize high pressure pumping.
High-low pressure switching system when work of concrete pump of the present invention, in the first selector valve valve 1, the second selector valve 2, have one must be in meta.The state of low pressure pumping: hydraulic fluid port P21, P5 or P22, P5 be actuating pressure oil always, hydraulic fluid port P31, P32 alternating action high pressure oil, hydraulic fluid port P11, P12, P6 be actuating pressure oil not.The state of high pressure pumping: hydraulic fluid port P11, P6 or P12, P6 be actuating pressure oil always, hydraulic fluid port P41, P42 alternating action high pressure oil, hydraulic fluid port P21, P22, P5 be actuating pressure oil not.The pressure oil effect of the hydraulic fluid port of each valve or do not act in the high-low pressure switching system of concrete pump of the present invention, and the operation such as the switching of the port of each valve is realized by control gear control.
According to one embodiment of present invention, a kind of concrete pump comprises concrete pump high-low pressure switching hydraulic system as above.
The high-low pressure switching system of concrete pump of the present invention and concrete pump, can make concrete pump easily realize at short notice the switching that low pressure arrives low pressure to switching or the high pressure of high pressure, thereby promote the efficiency of construction of concrete pump, reduction workman's construction intensity, promote the overall performance of concrete pump, and can in frequent commutation work, avoid the spring failure in selector valve, assurance car load is normally worked.
The disclosed arbitrary technological scheme of the invention described above unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the present invention just discloses part numerical value to illustrate technological scheme of the present invention, and the above-mentioned numerical value of enumerating should not form the restriction to the invention protection domain.
Simultaneously, if the invention described above discloses or has related to component or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technological scheme of the invention described above applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts provided by the invention can be both to be assembled by multiple independent constituent elements, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate technological scheme of the present invention
Non-to its restriction; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request protection of the present invention.
Claims (8)
1. a high-low pressure switching system for concrete pump, is characterized in that, comprising:
The first selector valve (1), the second selector valve (2), the 3rd selector valve (3), the 4th selector valve (4), the first cartridge valve (5) and the second cartridge valve (6); The first actuator port of described the first selector valve (1) is connected respectively oil-feed path with the first actuator port of described the second selector valve (2); The second actuator port of described the first selector valve (1) is connected respectively drainback passage with the second actuator port of described the second selector valve (2);
The 3rd actuator port of described the first selector valve (1) is connected with the first actuator port and second actuator port of described the 4th selector valve (4) respectively with the 4th actuator port, and the 3rd actuator port of described the 4th selector valve (4) is connected with the rodless cavity of described the second oil cylinder (7) with the rodless cavity of the first oil cylinder (8) respectively with the 4th actuator port; The first actuator port of described the second cartridge valve (6) is connected with the rodless cavity of described the second oil cylinder (7) with the rodless cavity of the first oil cylinder (8) respectively with the second actuator port;
The 3rd actuator port of described the second selector valve (2) is connected with the first actuator port and second actuator port of described the 3rd selector valve (3) respectively with the 4th actuator port, and the 3rd actuator port of described the 3rd selector valve (3) is connected with the rod chamber of described the second oil cylinder (7) with the rod chamber of the first oil cylinder (8) respectively with the 4th actuator port; The first actuator port of described the first cartridge valve (5) is connected with the rod chamber of described the second oil cylinder (7) with the rod chamber of the first oil cylinder (8) respectively with the second actuator port.
2. the system as claimed in claim 1, is characterized in that:
Described the first selector valve (1) and the second selector valve (2) are 3-position 4-way hydraulicchange-over valve, and wherein, described 3-position 4-way hydraulicchange-over valve comprises the spring for spool is resetted.
3. system as claimed in claim 2, is characterized in that:
Described the 3rd selector valve (3) and described the 4th selector valve (4) are two four-way pilot operated directional control valves.
4. system as claimed in claim 3, is characterized in that:
Also comprise for the plunger pump to described oil-feed path incoming pressure oil.
5. system as claimed in claim 4, is characterized in that:
Spool at described the first selector valve (1), the second selector valve (2) is positioned under the state of meta, and the first working port, the second working port, the 3rd working port and the 4th working port of described the first selector valve (1), described the second selector valve (2) are not connected.
6. system as claimed in claim 5, is characterized in that:
Under the state of low pressure pumping, the spool of described the first selector valve (1) is positioned at meta, described the first cartridge valve (5) is closed, described the second cartridge valve (6) is opened, when the spool of described the second selector valve (2) in left position, described the 3rd selector valve (3) is during in right position, pressure oil passes through the first actuator port of the first actuator port of described the second selector valve (2) and the 3rd actuator port, described the 3rd selector valve (3) and the 3rd actuator port and enters the rod chamber of the first oil cylinder (8) successively, promotes the piston movement of described the first oil cylinder (8); The first actuator port of pressure oil described the second cartridge valve of process (6) in the rodless cavity of described the first oil cylinder (8) and the second actuator port enter the rodless cavity of described the second oil cylinder (7), promote the piston movement of described the second oil cylinder (7); The 4th actuator port and the second actuator port that pressure oil in the rod chamber of described the second oil cylinder (7) passes through the 4th actuator port of described the 3rd selector valve (3) and the second actuator port, described the second selector valve (2) successively enter drainback passage;
When the spool of described the second selector valve (2) in left position, described the 3rd selector valve (3) is during in left position, pressure oil passes through the first actuator port of the first actuator port of described the second selector valve (2) and the 3rd actuator port, described the 3rd selector valve (3) and the 4th actuator port and enters the rod chamber of the second oil cylinder (7) successively, promotes the piston movement of described the second oil cylinder (7); The second actuator port of pressure oil described the second cartridge valve of process (6) in the rodless cavity of described the second oil cylinder (7) and the first actuator port enter the rodless cavity of described the first oil cylinder (8), promote the piston movement of described the first oil cylinder (8); The 4th actuator port and the second actuator port that pressure oil in the rod chamber of described the first oil cylinder (8) passes through the 3rd actuator port of described the 3rd selector valve (3) and the second actuator port, described the second selector valve (2) successively enter drainback passage.
7. system as claimed in claim 6, is characterized in that:
Under the state of high pressure pumping, the spool of described the second selector valve (2) is positioned at meta, described the first cartridge valve (5) is opened, described the second cartridge valve (6) is closed, when the spool of described the first selector valve (1) spool in left position, described the 4th selector valve (4) is during in right position, pressure oil passes through the first actuator port of the first actuator port of described the first selector valve (1) and the 3rd actuator port, described the 4th selector valve (4) and the 3rd actuator port and enters the rodless cavity of the first oil cylinder (8) successively, promotes the piston movement of described the first oil cylinder (8); The first actuator port of pressure oil described the first cartridge valve of process (5) in the rod chamber of described the first oil cylinder (8) and the second actuator port enter the rod chamber of described the second oil cylinder (7), promote the piston movement of described the second oil cylinder (7); The 4th actuator port and the second actuator port that pressure oil in the rodless cavity of described the second oil cylinder (7) passes through the 4th actuator port of described the 4th selector valve (4) and the second actuator port, described the first selector valve (1) successively enter drainback passage;
When the spool of described the first selector valve (1) in left position, described the 4th selector valve (4) is during in left position, pressure oil passes through the first actuator port of the first actuator port of described the first selector valve (1) and the 3rd actuator port, described the 4th selector valve (4) and the 4th actuator port and enters the rodless cavity of the second oil cylinder (7) successively, promotes the piston movement of described the second oil cylinder (7); The second actuator port of pressure oil described the first cartridge valve of process (5) in the rod chamber of described the second oil cylinder (7) and the first actuator port enter the rod chamber of described the first oil cylinder (8), promote the piston movement of described the first oil cylinder (8); The 4th actuator port and the second actuator port that pressure oil in the rodless cavity of described the first oil cylinder (8) passes through the 3rd actuator port of described the 4th selector valve (3) and the second actuator port, described the first selector valve (1) successively enter drainback passage.
8. a concrete pump, is characterized in that:
Comprise the high-low pressure switching system of the concrete pump as described in claim 1 to 7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103836020B CN103836020B (en) | 2016-09-14 |
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Cited By (3)
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| 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 |
| CN111322280A (en) * | 2020-03-04 | 2020-06-23 | 徐州徐工施维英机械有限公司 | Double-valve-core full-hydraulic-control integrated pumping reversing system and method |
| WO2021174931A1 (en) * | 2020-03-04 | 2021-09-10 | 徐州徐工施维英机械有限公司 | Device and system with control logic for automatically switching between high and low pressure, and control method therefor |
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| WO2021174931A1 (en) * | 2020-03-04 | 2021-09-10 | 徐州徐工施维英机械有限公司 | Device and system with control logic for automatically switching between high and low pressure, and control method therefor |
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| CN103836020B (en) | 2016-09-14 |
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