CN103671315A - Concrete pumping system and concrete pumping machine - Google Patents
Concrete pumping system and concrete pumping machine Download PDFInfo
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- CN103671315A CN103671315A CN201310652720.1A CN201310652720A CN103671315A CN 103671315 A CN103671315 A CN 103671315A CN 201310652720 A CN201310652720 A CN 201310652720A CN 103671315 A CN103671315 A CN 103671315A
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Abstract
The invention provides a concrete pumping system and a concrete pumping machine. The concrete pumping system comprises a main oil pump, a main reversing valve set, a first main oil cylinder, a second main oil cylinder, a first man oil way and a second main oil way, wherein the first main oil way connects the main reversing valve set with the first main oil cylinder, and the second main oil way connects the main reversing valve set with the second main oil cylinder. The main oil pump drives the first main oil cylinder and the second main oil cylinder to conduct pumping operation through the main reversing valve set. The concrete pumping system further comprises an overhaul control oil way, the overhaul control oil way is independent from the first main oil way and the second main oil way to be controlled, and the overhaul control oil way comprises a first control valve and a second control valve, wherein the first control valve controls oil to flow into one of a non-rod chamber and a rod chamber of the first main oil cylinder, and controls oil to be drained from the other of the non-rod chamber and the rod chamber of the first main oil cylinder, and the second control valve controls oil to flow into one of a non-rod chamber and a rod chamber of the second main oil cylinder, and controls oil to be drained from the other of the non-rod chamber and the rod chamber of the second main oil cylinder. The two main oil cylinders are independently controlled by the two control valves, and therefore two concrete cylinder pistons are made to retract at the same time.
Description
Technical field
The present invention relates to concrete pumping field, in particular to a kind of concrete pumping system and concrete pumping machinery.
Background technique
As shown in Fig. 1 a and Fig. 1 b, in the prior art, concrete pumping system comprises the first master cylinder 5 and the second master cylinder 6, and in the course of the work, the first master cylinder 5 and the second master cylinder 6 are serial oil cylinders, as shown in Figure 1a, during two master cylinder rodless cavity 5A, 6A series connection, being low-pressure state, as shown in Figure 1 b, is high pressure conditions during two master cylinder rod chamber 5B, 6B series connection, because of the existence in series connection chamber, two main oil cylinder piston bars are always stretched a contracting state in one.
Low-pressure state as shown in Figure 2, by the interaction effect of main oil pump 1, main reversing valve group 2, drives hydraulic oil interior mobile at the first working connection 3, the second working connections 4.The direction of arrow as shown, hydraulic oil enters the rod chamber 6B of the second master cylinder 6 from the second working connection 4, drive the piston in the second master cylinder 6 to retreat, and drives the second concrete piston 12 in the second concrete cylinder 9 to retreat, and concrete sucks in the second concrete cylinders 9 from hopper 13.When the piston in hydraulic oil drives the second master cylinder 6 retreats, the hydraulic oil of the chamber 6A of UNICOM, 5A drives the piston-advance in the first master cylinder 5, and hydraulic oil flows out from the rod chamber 5B of the first master cylinder 5, enters the first working connection 3; Concrete in the first concrete cylinder 8 enters pouring concrete point by distributing valve 14 under the promotion of the first concrete piston 11.
Wherein, promote concrete two concrete pistons 11,12 for easily damaged parts, changes extremely frequently, before construction, two concrete pistons 11,12 all must be return in water tank 10 and be checked, occur that damage needing timely replacing; The working life of while two concrete cylinders 8,9 and master cylinder 5,6 is also shorter, need often change.In plant maintenance process, change impaired concrete cylinder or master cylinder and must first the concrete piston of homonymy first be return to water tank, just concrete cylinder 8,9 or master cylinder 5,6 can be pulled down.
In conjunction with the maintenance shown in Fig. 4, change replacing master cylinder, the concrete cylinder schematic flow sheet shown in concrete piston flow chart and Fig. 5, illustrate the method that concrete piston 11,12 is return water tank 10.Concrete pumping system dimension process, first concrete pumping system is switched to low-pressure state as shown in Figure 2, first close the ball valve 7 of the second master cylinder 6 tail ends, hydraulic oil enters the rod chamber 6B of the second master cylinder 6 from the second working connection 4, drive the piston in the second master cylinder 6 to retreat, until concrete piston 12 retreats in water tank 10; Under the hydraulic oil effect in UNICOM chamber, the piston rod of the first master cylinder 5 protracts simultaneously, promotes the first concrete piston 11 and advances in the first concrete cylinder 8.
After concrete piston 12 retreats in water tank 10 and to check or change, close the ball valve 7 of the first master cylinder 5 tail ends, the 2 spool commutations of main reversing valve group, hydraulic oil enters the rod chamber (5B) of the first master cylinder 5 from the first working connection 3, drive the piston in the first master cylinder 5 to retreat, until the first concrete piston 11 retreats in water tank 10; Under the hydraulic oil effect in UNICOM chamber, the piston rod of the second master cylinder 6 protracts simultaneously, promotes the second concrete piston 12 and advances in the second concrete cylinder 9.
In the prior art, concrete pumping system adopts six cartridge valves 15 to realize the automatic switchover of low-pressure state and high pressure conditions conventionally.Specifically as shown in Figure 3, when two position and four-way reversing valves 16 are in left when position, three cartridge valve 15A that be connected with two master cylinders and that control mouth is all connected with two position and four-way reversing valve 16 second actuator ports close (by high pressure oil, being killed), and the control mouth of other three cartridge valve 15B is all connected with two position and four-way reversing valve 16 first actuator ports, now these three cartridge valve 15B are in on-state, thereby concrete pumping system is in low-pressure state; When two position and four-way reversing valve 16 electromagnet obtain electricly, two position and four-way reversing valves 16 are in right position, and three cartridge valve 15B that are connected with two master cylinders close (by high pressure oil, being killed), three cartridge valve 15A connections, and concrete pumping system is in high pressure conditions; Which changes oil pipe without shutdown, and concrete pumping system just can automatically switch between low pressure, high pressure conditions, meets the needs of equipment under different pumping construction operating modes.In realize the scheme of high low pressure automatic switchover by six cartridge valves 15, as concrete piston 11,12 return in water tank 10, check, device translates need to be return respectively to just changing of water tank 10 by concrete piston 11,12 according to the method described above under low-pressure state equally.
That is to say, in existing technological scheme, under high low pressure state, because there is UNICOM chamber, two main oil cylinder piston bars are always stretched a contracting state in one, once can only move back a concrete piston recovery tank, and another concrete piston is still in concrete cylinder, once can only change a concrete piston, the installation of concrete piston, check still time-consuming.Because once moving back a concrete piston recovery tank, another concrete piston still, in concrete cylinder, need move back concrete piston cycle through twice while changing master cylinder or concrete cylinder.
Summary of the invention
The present invention aims to provide a kind of concrete pumping system and the concrete pumping machinery that can more conveniently safeguard rapidly concrete cylinder or oil cylinder.
The invention provides a kind of concrete pumping system, comprise main oil pump, main reversing valve group, the first master cylinder and the second master cylinder, and the first working connection and the second working connection that is connected main reversing valve group and the second master cylinder that connect main reversing valve group and the first master cylinder, main oil pump drives the first master cylinder and the second master cylinder pumping to work by main reversing valve group; Concrete pumping system also comprises the maintenance oil circuit control of independently controlling with the first working connection and the second working connection, maintenance oil circuit control comprises controls the oil-feed in the two of the rodless cavity of the first master cylinder and rod chamber, the first control valve of another oil extraction in the two, and control the oil-feed in the two of the rodless cavity of the second master cylinder and rod chamber, the second control valve of another oil extraction in the two.
Further, the first control valve is three-position four-way valve, comprises the first actuator port being connected with the rodless cavity of the first master cylinder, the second actuator port being connected with the rod chamber of the first master cylinder, the pressure hydraulic fluid port being connected with oil pump and the return opening being connected with fuel tank; The second control valve is three-position four-way valve, comprises the first actuator port being connected with the rodless cavity of the second master cylinder, the second actuator port being connected with the rod chamber of the second master cylinder, the pressure hydraulic fluid port being connected with oil pump and the return opening being connected with fuel tank.
Further, the first control valve and the second control valve are O type three-position four-way valve.
Further, the latus rectum of the first control valve is less than the latus rectum of main reversing valve group; The latus rectum of the second control valve is less than the latus rectum of main reversing valve group.
Further, concrete pumping system also comprises the 3rd control valve; The 3rd control valve has controls the first working state that concrete pumping system switches to high pressure pumping state, switch to the second working state of low pressure pumping state with control concrete pumping system, and control the 3rd working state that concrete pumping system switches to non-pumping state; When the 3rd control valve is positioned at the 3rd working state, the first working connection and the second working connection quit work, and maintenance oil circuit control controls the first master cylinder and the second master cylinder overhauls.
Further, when the 3rd control valve is positioned at the 3rd working state, the first control valve and the second control valve have to be controlled the first state that the first master cylinder and the second master cylinder retreat simultaneously and controls the first master cylinder and the second state that the second master cylinder advances simultaneously.
Further, the 3rd control valve is when the first working state, and the first working connection is connected with the rodless cavity of the first master cylinder, and the second working connection is connected with the rodless cavity of the second master cylinder, and the rod chamber of the first master cylinder is connected with the rod chamber of the second master cylinder; The 3rd control valve is when the second working state, and the first working connection is connected with the rod chamber of the first master cylinder, and the second working connection is connected with the rod chamber of the second master cylinder, and the rodless cavity of the first master cylinder is connected with the rodless cavity of the second master cylinder.
Further, concrete pumping system also comprises high pressure control valve group and low-pressure control valve group; High pressure control valve group comprises the first cartridge valve, the second cartridge valve and the 3rd cartridge valve, and wherein, the first connecting port of the first cartridge valve is connected with the first working connection, and the second connecting port of the first cartridge valve is connected with the rodless cavity of the first master cylinder; The first connecting port of the second cartridge valve is connected with the second working connection, and the second connecting port of the second cartridge valve is connected with the rodless cavity of the second master cylinder; The first connecting port of the 3rd cartridge valve is connected with the rod chamber of the first master cylinder, and the second connecting port of the 3rd cartridge valve is connected with the rod chamber of the second master cylinder; Low-pressure control valve group comprises the 4th cartridge valve, the 5th cartridge valve and the 6th cartridge valve, and wherein, the first connecting port of the 4th cartridge valve is connected with the first working connection, and the second connecting port of the 4th cartridge valve is connected with the rod chamber of the first master cylinder; The first connecting port of the 5th cartridge valve is connected with the second working connection, and the second connecting port of the 5th cartridge valve is connected with the rod chamber of the second master cylinder; The first connecting port of the 6th cartridge valve is connected with the rodless cavity of the first master cylinder, and the second connecting port of the 6th cartridge valve is connected with the rodless cavity of the second master cylinder; The 3rd control valve is three-position four-way valve, and the control mouth of the first cartridge valve, the second cartridge valve and the 3rd cartridge valve is connected with the first actuator port of the 3rd control valve jointly; The control mouth of the 4th cartridge valve, the 5th cartridge valve and the 6th cartridge valve is connected with the second actuator port of the 3rd control valve jointly; When the 3rd control valve is positioned at the first working state, high pressure control valve group is opened and low-pressure control valve group is closed; When the 3rd control valve is positioned at the second working state, high pressure control valve group is closed and low-pressure control valve group is opened; When the 3rd control valve is positioned at the 3rd working state, high pressure control valve group and low-pressure control valve group are closed simultaneously.
Further, the 3rd control valve is P type three-position four-way valve.
The present invention also provides a kind of concrete pumping machinery, comprises aforesaid pumping system.
According to concrete pumping system of the present invention and concrete pumping machinery, by maintenance oil circuit control is set, and maintenance oil circuit control comprise control the rodless cavity of the first master cylinder and rod chamber the two one of oil-feed, the first control valve of the two another oil extraction, and control the rodless cavity of the second master cylinder and rod chamber the two one of oil-feed, the second control valve of the two another oil extraction.The first master cylinder and the second master cylinder are independently controlled by two control valves, in maintenance process, control the equal oil-feed of rod chamber that two control valves make the first master cylinder and the second master cylinder, the equal oil extraction of rodless cavity, make two concrete cylinder pistons all return in water tank, easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.After maintenance completes, two master cylinders are independently controlled, and can easily make two master cylinders be returned to a working state of stretching a contracting.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 a is the low-pressure state schematic diagram of the concrete pumping system of prior art;
Fig. 1 b is the high pressure conditions schematic diagram of the concrete pumping system of prior art;
Fig. 2 is the low-pressure state pumping schematic diagram of the concrete pumping system of prior art;
Fig. 3 is that the high low pressure of the concrete pumping system of prior art switches schematic diagram;
Fig. 4 is the maintenance concrete piston schematic flow sheet of the concrete pumping system of prior art;
Fig. 5 is maintenance concrete cylinder or the master cylinder schematic flow sheet of the concrete pumping system of prior art;
Fig. 6 is the structural representation according to concrete pumping system of the present invention; And
Fig. 7 is the maintenance schematic flow sheet according to concrete pumping system of the present invention.
Embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
As shown in Figure 6 and Figure 7, according to concrete pumping system of the present invention, comprise main oil pump 1, main reversing valve group 2, the first master cylinder 5 and the second master cylinder 6, and the first working connection 3 and the second working connection 4 that is connected main reversing valve group 2 and the second master cylinder 6 that connect main reversing valve group 2 and the first master cylinder 5, main oil pump 1 drives the first master cylinder 5 and the second master cylinder 6 pumpings to work by main reversing valve group 2; Concrete pumping system also comprises and the first working connection 3 and the independent maintenance oil circuit control of controlling of the second working connection 4, maintenance oil circuit control comprises controls the rodless cavity 5A of a first master cylinder 5 and rod chamber 5B oil-feed in the two, the first control valve 18A of another oil extraction in the two, and control the rodless cavity 6A of a second master cylinder 6 and rod chamber 6B oil-feed in the two, the second control valve 18B of another oil extraction in the two.Be that the present invention passes through to arrange and independently overhauls oil circuit control; with independent the first master cylinder 5 and the second master cylinder 6 controlled; concrete pumping system is in shutting down maintenance process; can control the first control valve 18A and the second control valve 18B simultaneously; make the equal oil-feed of rod chamber of the first master cylinder 5 and the second master cylinder 6, the equal oil extraction of rodless cavity, makes two concrete cylinder pistons all return in water tank; easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.And after maintenance completes, by independently controlling two control valve 18A, 18B to control the oil-feed state of two master cylinders, this concrete pumping system can easily make two master cylinders be returned to a working state of stretching a contracting, so that can carry out normal pumping work next time.
Preferably, the first control valve 18A and the second control valve 18B are three-position four-way valve, the first control valve 18A comprises the first actuator port, the second actuator port, pressure hydraulic fluid port and return opening, the first actuator port of the first control valve 18A is connected with the rodless cavity 5A of the first master cylinder 5 by oil pipe, and the second actuator port of the first control valve 18A is connected with the rod chamber 5B of the first master cylinder 5 by oil pipe; Similarly, the second control valve 18B also comprises the first actuator port, the second actuator port, pressure hydraulic fluid port and return opening, the first actuator port of the second control valve 18B is connected with the rodless cavity 6A of the second master cylinder 6 by oil pipe, and the second actuator port of the second control valve 18B is connected with the rod chamber 6B of the second master cylinder 6 by oil pipe.The first control valve 18A is connected with pressure oil-source with the pressure hydraulic fluid port of the second control valve 18B, and the return opening of the first control valve 18A and the second control valve 18B is connected with oil sump tank.The first control valve 18A independently controls the flexible of the first master cylinder 5, the second control valve 18B independently controls the flexible of the second master cylinder 6, at concrete pumping system, shut down in maintenance process, can independently control two master cylinders retracts simultaneously, thereby drive the concrete piston-retraction of two concrete cylinders, also can control two oil cylinders stretches out, can also control two master cylinders and reset to an original state of stretching a contracting, compared to existing technology, once can only change or overhaul one, the present invention is by simple architecture advances, can once overhaul two concrete pistons, concrete cylinder or master cylinder, effectively reduce the plant maintenance time.
Preferably, the first control valve 18A and the second control valve 18B are O type three-position four-way valve.The first control valve 18A and the second control valve 18B are when being positioned at meta; the rod chamber of two master cylinders and rodless cavity be not all by the first control valve 18A and the second control valve 18B oil-feed or draining; make concrete pumping system when pumpdown; two master cylinders can not overhauled the impact of oil circuit control; and be operated in normal pumping state, guarantee that the pumpdown of concrete pumping system and two working conditions of upkeep operation are independent of each other.
More preferably, the latus rectum of the first control valve 18A is less than the latus rectum of main reversing valve group 2; The latus rectum of the second control valve 18B is less than the latus rectum of main reversing valve group 2, the hydraulic element price that latus rectum is less is on the one hand relatively lower, on the other hand, compared to existing technology, by main reversing valve group 2 and main hydraulic circuit, directly drive, the present invention is in maintenance process, the first control valve 18A and the second control valve 18B by little latus rectum drive the first master cylinder 5 and the second master cylinder 6 fore and aft motion, stretching speed is lower, within the scope of safety speed, prevents that velocity of piston is too fast and security incident occurs.
In addition, the oil circuit control that the present invention also adopts high low pressure of the prior art to automatically switch, for example, 6 cartridge valves that pass through shown in Fig. 6 are realized.Unlike the prior art, the present invention adopts three-position four-way valve to control 6 cartridge valves and realizes, compared to existing technology, three-position four-way valve is compared two position four-way valves and is also had meta, thereby can make the rod chamber of two master cylinders and rodless cavity all not be communicated with, make two master cylinders independent, two master cylinders do not have UNICOM chamber, while being more conducive to upkeep operation, by maintenance oil circuit control, accurately control two master cylinders.In Fig. 6, the 3rd control valve 17 is P type three-position four-way valve, when meta, two actuator ports are all communicated with pressure hydraulic fluid port, 6 cartridge valves are all closed, and the first working connection 3 and the second working connection 4 are not worked, and maintenance oil circuit control controls the first master cylinder 5 and the second master cylinder 6 overhauls.
Particularly, in conjunction with its working state is described shown in Fig. 6:
1, the 3rd control valve 17(P type three-position four-way valve), when left position, three cartridge valves of high pressure control valve group 15A are closed, and three cartridge valves of low-pressure control valve group 15B are opened, and the rod chamber 5B of the first working connection 3 and the first master cylinder 5 connects; The rod chamber 6B of the second working connection 4 and the second master cylinder 6 connects; The rodless cavity 6A of the rodless cavity 5A of the first master cylinder 5 and the second master cylinder 6 connects and forms UNICOM chamber, and now pumping system is in low pressure pumping state;
2, the 3rd control valve 17(P type three-position four-way valve) when right position, three cartridge valves of high pressure control valve group 15A are opened, and three cartridge valves of low-pressure control valve group 15B are closed, and the rodless cavity 5A of the first working connection 3 and the first master cylinder 5 connects; The rodless cavity 6A of the second working connection 4 and the second master cylinder 6 connects; The rod chamber 6B of the rod chamber 5B of the first master cylinder 5 and the second master cylinder 6 connects and forms UNICOM chamber, and now pumping system is in high pressure pumping state;
3, the 3rd control valve 17(P type three-position four-way valve) when meta, 6 cartridge valves of high pressure control valve group 15A and low-pressure control valve group 15B are all closed, the rod chamber of the first master cylinder 5 and the second master cylinder 6 and rodless cavity are all in closed condition, neither forming UNICOM chamber does not connect with the first working connection 3, the second working connection 4 yet, now pumping system, in non-pumping state, is more conducive to overhaul oil circuit control and accurately controls two master cylinders.
When concrete pump is during in low pressure or high pressure pumping state, the first control valve 18A(O type three-position four-way valve) and the second control valve 18B(O type three-position four-way valve) all in meta, the first control valve 18A and the second control valve 18B are all in closed condition, the pressure oil P2 that pressure oil-source (oil pump) provides can not enter in the first master cylinder 5 and the second master cylinder 6, the first master cylinder 5 and the second master cylinder 6 series connection pumping work.
In conjunction with Fig. 6 and Fig. 7, illustrate maintenance process, first by the 3rd control valve 17(P type three-position four-way valve) be adjusted to meta, make concrete pumping system in non-pumping state, then close ball valve 7, the first control valve 18A(O type three-position four-way valves of the first master cylinder 5 and the second master cylinder 6 tail ends) with the second control valve 18B(O type three-position four-way valve) two actuator ports be connected respectively rod chamber and the rodless cavity of the first master cylinder 5 and the second master cylinder 6; Controller send instruction make the first control valve 18A in left position (DT21 obtains electric), the second control valve 18B in right position (DT12 obtains electric), pressure oil P2 enters the rod chamber 5B of the first master cylinder 5, the rod chamber 6B of the second master cylinder 6, drives the first concrete piston, the second concrete piston to retreat in water tank simultaneously; After two concrete piston Inspection and maintenances, controller sends instruction and makes the first control valve 18A(O type three-position four-way valve) in right (DT22 obtains electric), the second control valve 18B(O type three-position four-way valve) in left position (DT11 obtains electric), pressure oil P2 enters the rodless cavity 5A of the first master cylinder 5, the rodless cavity 6A of the second master cylinder 6, and promotion the first concrete piston, the second concrete piston extend in the first concrete cylinder, the second concrete cylinder simultaneously.In the present invention, main oil pump 1 is for system provides pressure oil, thereby the flow direction that main reversing valve group 2 is controlled in the first working connection 3, the second working connection 4 is controlled two master cylinder series connection pumping work.
The present invention also provides a kind of concrete pumping machinery, comprise aforesaid concrete pumping system, in maintenance process, can make the concrete piston being connected with two master cylinders retreat into water tank simultaneously, easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
According to concrete pumping system of the present invention and concrete pumping machinery, by maintenance oil circuit control is set, and maintenance oil circuit control comprise control the rodless cavity of the first master cylinder and rod chamber the two one of oil-feed, the first control valve of the two another oil extraction, and control the rodless cavity of the second master cylinder and rod chamber the two one of oil-feed, the second control valve of the two another oil extraction.The first master cylinder and the second master cylinder are independently controlled by two control valves, in maintenance process, control the equal oil-feed of rod chamber that two control valves make the first master cylinder and the second master cylinder, the equal oil extraction of rodless cavity, make two concrete cylinder pistons all return in water tank, easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.After maintenance completes, two master cylinders are independently controlled, and can easily make two master cylinders be returned to a working state of stretching a contracting.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a concrete pumping system, comprise main oil pump (1), main reversing valve group (2), the first master cylinder (5) and the second master cylinder (6), and the first working connection (3) and the second working connection (4) that is connected described main reversing valve group (2) and described the second master cylinder (6) that connect described main reversing valve group (2) and described the first master cylinder (5), described main oil pump (1) drives described the first master cylinder (5) and described the second master cylinder (6) pumping work by described main reversing valve group (2);
It is characterized in that, described concrete pumping system also comprises and described the first working connection (3) and the independent maintenance oil circuit control of controlling of described the second working connection (4), described maintenance oil circuit control comprises controls the oil-feed in the two of the rodless cavity (5A) of described the first master cylinder (5) and rod chamber (5B), first control valve (18A) of another oil extraction in the two, and control the oil-feed in the two of the rodless cavity (6A) of described the second master cylinder (6) and rod chamber (6B), second control valve (18B) of another oil extraction in the two.
2. concrete pumping system according to claim 1, is characterized in that,
Described the first control valve (18A) is three-position four-way valve, comprises the first actuator port being connected with the rodless cavity (5A) of described the first master cylinder (5), the second actuator port, the pressure hydraulic fluid port being connected with oil pump and the return opening being connected with fuel tank that are connected with the rod chamber (5B) of described the first master cylinder (5);
Described the second control valve (18B) is three-position four-way valve, comprises the first actuator port being connected with the rodless cavity (6A) of described the second master cylinder (6), the second actuator port being connected with the rod chamber (6B) of described the second master cylinder (6), the pressure hydraulic fluid port being connected with described oil pump and the return opening being connected with described fuel tank.
3. concrete pumping system according to claim 2, is characterized in that,
Described the first control valve (18A) and described the second control valve (18B) are O type three-position four-way valve.
4. concrete pumping system according to claim 3, is characterized in that,
The latus rectum of described the first control valve (18A) is less than the latus rectum of described main reversing valve group (2);
The latus rectum of described the second control valve (18B) is less than the latus rectum of described main reversing valve group (2).
5. according to the concrete pumping system described in any one in claim 1 to 4, it is characterized in that,
Described concrete pumping system also comprises the 3rd control valve (17);
Described the 3rd control valve (17) has controls the first working state that described concrete pumping system switches to high pressure pumping state, switch to the second working state of low pressure pumping state with the described concrete pumping system of control, and control the 3rd working state that described concrete pumping system switches to non-pumping state;
When described the 3rd control valve (17) is positioned at described the 3rd working state, described the first working connection (3) and described the second working connection (4) quit work, and described maintenance oil circuit control controls described the first master cylinder (5) and the second master cylinder (6) overhauls.
6. concrete pumping system according to claim 5, is characterized in that,
When described the 3rd control valve (17) is positioned at described the 3rd working state, described the first control valve (18A) and described the second control valve (18B) have the second state that the first state that described the first master cylinder (5) and described the second master cylinder (6) retreat simultaneously and control described the first master cylinder (5) and described the second master cylinder (6) advance simultaneously of controlling.
7. concrete pumping system according to claim 5, is characterized in that,
Described the 3rd control valve (17) is when described the first working state, described the first working connection (3) is connected with the rodless cavity (5A) of described the first master cylinder (5), described the second working connection (4) is connected with the rodless cavity (6A) of described the second master cylinder (6), and the rod chamber (5B) of described the first master cylinder (5) and the rod chamber (6B) of the second master cylinder (6) are connected;
Described the 3rd control valve (17) is when described the second working state, described the first working connection (3) is connected with the rod chamber (5B) of described the first master cylinder (5), described the second working connection (4) is connected with the rod chamber (6B) of described the second master cylinder (6), and the rodless cavity (5A) of described the first master cylinder (5) and the rodless cavity (6A) of the second master cylinder (6) are connected.
8. concrete pumping system according to claim 5, is characterized in that,
Described concrete pumping system also comprises high pressure control valve group (15A) and low-pressure control valve group (15B);
Described high pressure control valve group (15A) comprises the first cartridge valve, the second cartridge valve and the 3rd cartridge valve, wherein,
The first connecting port of described the first cartridge valve is connected with described the first working connection (3), and the second connecting port of described the first cartridge valve is connected with the rodless cavity (5A) of described the first master cylinder (5);
The first connecting port of described the second cartridge valve is connected with described the second working connection (4), and the second connecting port of described the second cartridge valve is connected with the rodless cavity (6A) of described the second master cylinder (6);
The first connecting port of described the 3rd cartridge valve is connected with the rod chamber (5B) of described the first master cylinder (5), and the second connecting port of described the 3rd cartridge valve is connected with the rod chamber (6B) of described the second master cylinder (6);
Described low-pressure control valve group (15B) comprises the 4th cartridge valve, the 5th cartridge valve and the 6th cartridge valve, wherein,
The first connecting port of described the 4th cartridge valve is connected with described the first working connection (3), and the second connecting port of described the 4th cartridge valve is connected with the rod chamber (5B) of described the first master cylinder (5);
The first connecting port of described the 5th cartridge valve is connected with described the second working connection (4), and the second connecting port of described the 5th cartridge valve is connected with the rod chamber (6B) of described the second master cylinder (6);
The first connecting port of described the 6th cartridge valve is connected with the rodless cavity (5A) of described the first master cylinder (5), and the second connecting port of described the 6th cartridge valve is connected with the rodless cavity (6A) of described the second master cylinder (6);
Described the 3rd control valve (17) is three-position four-way valve, and the control mouth of described the first cartridge valve, described the second cartridge valve and described the 3rd cartridge valve is connected with the first actuator port of described the 3rd control valve (17) jointly; The control mouth of described the 4th cartridge valve, described the 5th cartridge valve and described the 6th cartridge valve is connected with the second actuator port of described the 3rd control valve (17) jointly;
When described the 3rd control valve (17) is positioned at described the first working state, described high pressure control valve group (15A) is opened and described low-pressure control valve group (15B) is closed; When described the 3rd control valve (17) is positioned at described the second working state, described high pressure control valve group (15A) is closed and described low-pressure control valve group (15B) is opened; When described the 3rd control valve (17) is positioned at described the 3rd working state, described high pressure control valve group (15A) and described low-pressure control valve group (15B) are closed simultaneously.
9. concrete pumping system according to claim 5, is characterized in that,
Described the 3rd control valve (17) is P type three-position four-way valve.
10. a concrete pumping machinery, comprises pumping system, it is characterized in that, described pumping system is the concrete pumping system described in any one in claim 1 to 9.
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| CN107120261A (en) * | 2017-06-19 | 2017-09-01 | 柳工建机江苏有限公司 | A kind of enclosed pumping system concrete piston automatic retracting device and its control method |
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| CN103671315B (en) | 2016-03-30 |
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