CN103671315B - Concrete pumping system and concrete pumping machine - Google Patents
Concrete pumping system and concrete pumping machine Download PDFInfo
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- CN103671315B CN103671315B CN201310652720.1A CN201310652720A CN103671315B CN 103671315 B CN103671315 B CN 103671315B CN 201310652720 A CN201310652720 A CN 201310652720A CN 103671315 B CN103671315 B CN 103671315B
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- 238000005086 pumping Methods 0.000 title claims abstract description 93
- 238000012423 maintenance Methods 0.000 claims abstract description 35
- 210000000664 rectum Anatomy 0.000 claims description 14
- 238000000605 extraction Methods 0.000 claims description 13
- 239000002828 fuel tank Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 58
- 238000000034 method Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000010720 hydraulic oil Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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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 group, a first main oil cylinder, a second main oil cylinder, a first main oil way and a second main oil way, wherein the first main oil way is used for connecting the main reversing valve group and the first main oil cylinder, and the second main oil way is used for connecting the main reversing valve group and the second main oil cylinder; the concrete pumping system also comprises a maintenance control oil path which is independently controlled with the first main oil path and the second main oil path, wherein the maintenance control oil path comprises a first control valve which controls one of a rodless cavity and a rod cavity of the first main oil cylinder to feed oil and the other of the rodless cavity and the rod cavity to discharge oil, and a second control valve which controls one of the rodless cavity and the rod cavity of the second main oil cylinder to feed oil and the other of the rodless cavity and the rod cavity to discharge oil. The two main oil cylinders are independently controlled by the two control valves, so that the pistons of the two concrete cylinders simultaneously return.
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 illustrated in figs. ia and ib, 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, being low-pressure state during two master cylinder rodless cavity 5A, 6A series connection, 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 chamber of connecting, two main oil cylinder piston bars are always in one and stretch a contracting state.
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 flowing in the first working connection 3, second working connection 4.As shown by arrow direction, hydraulic oil enters the rod chamber 6B of the second master cylinder 6 from the second working connection 4, and drive the piston in the second master cylinder 6 to retreat, drive the second concrete piston 12 in the second concrete cylinder 9 to retreat, concrete sucks in the second concrete cylinder 9 from hopper 13.While hydraulic oil drives the piston in the second master cylinder 6 to retreat, the hydraulic oil of UNICOM chamber 6A, 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 first concrete cylinder 8 enters pouring concrete point by distributing valve 14 under the promotion of the first concrete piston 11.
Wherein, promoting concrete two concrete pistons 11,12 is easily damaged parts, changes extremely frequent, two concrete pistons 11,12 all must be return in water tank 10 and check before construction, and occurring damaging then needs timely replacing; The working life of two concrete cylinders 8,9 and master cylinder 5,6 is also shorter simultaneously, need often change.In plant maintenance process, change impaired concrete cylinder or the concrete piston of homonymy first first must be return water tank by master cylinder, just concrete cylinder 8,9 or master cylinder 5,6 can be pulled down.
Examine and replace concrete piston flow chart shown in composition graphs 4 and the replacing master cylinder shown in Fig. 5, concrete cylinder schematic flow sheet, illustrate, concrete piston 11,12 returns the method for water tank 10.Concrete pumping system dimension process, first concrete pumping system is switched to low-pressure state as shown in Figure 2, first the ball valve 7 of the second master cylinder 6 tail end is closed, hydraulic oil enters the rod chamber 6B of the second master cylinder 6 from the second working connection 4, the piston in the second master cylinder 6 is driven 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 checks or change, close the ball valve 7 of the first master cylinder 5 tail end, main reversing valve group 2 spool commutates, hydraulic oil enters the rod chamber (5B) of the first master cylinder 5 from the first working connection 3, the piston in the first master cylinder 5 is driven 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 usually.Specifically as shown in Figure 3, when two position and four-way reversing valves 16 are in left position, that be connected with two master cylinders and control three cartridge valve 15A that mouth is all connected with two position and four-way reversing valve 16 second actuator ports and close (being killed by high pressure oil), 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, thus concrete pumping system is in low-pressure state; When two position and four-way reversing valve 16 electromagnet obtain electric, two position and four-way reversing valves 16 are in right position, and three the cartridge valve 15B be connected with two master cylinders close (being killed by high pressure oil), and three cartridge valve 15A connect, and concrete pumping system is in high pressure conditions; Which changes oil pipe without the need to shutting down, and concrete pumping system just can automatically switch between low pressure, high pressure conditions, meets the needs of equipment under different pumping construction operating mode.In the scheme being realized high low pressure automatic switchover by six cartridge valves 15, check as concrete piston 11,12 return in water tank 10, under needing equipment to be transformed into low-pressure state equally, according to the method described above concrete piston 11,12 is return just changing of water tank 10 respectively.
That is, in existing technological scheme, under high low pressure state, because there is UNICOM chamber, two main oil cylinder piston bars are always in one and stretch a contracting state, and once can only move back a concrete piston recovery tank, another concrete piston is still in concrete cylinder, once can only change a concrete piston, installation, the inspection of concrete piston are 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 when 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 more conveniently can safeguard concrete cylinder or oil cylinder rapidly.
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 connecting the first working connection of main reversing valve group and the first master cylinder and the second working connection being connected main reversing valve group and the second master cylinder, main oil pump drives the first master cylinder and the second master cylinder pumping work by main reversing valve group; Concrete pumping system also comprises the maintenance oil circuit control with the first working connection and the separate control of the second working connection, maintenance oil circuit control comprises an oil-feed in both the rodless cavity of control first master cylinder and rod chamber, first control valve of another oil extraction in the two, and the oil-feed controlled in both 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, the return opening comprising the first actuator port be connected with the rodless cavity of the first master cylinder, the second actuator port be connected with the rod chamber of the first master cylinder, the pressure oil port be connected with oil pump and be connected with fuel tank; Second control valve is three-position four-way valve, the return opening comprising the first actuator port be connected with the rodless cavity of the second master cylinder, the second actuator port be connected with the rod chamber of the second master cylinder, the pressure oil port be connected with oil pump and be 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; 3rd control valve has the first working state that control 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 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 the first state that control first master cylinder and the second master cylinder retreat simultaneously and control the second state that the first master cylinder and the second master cylinder advance 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; 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; 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; 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; 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; 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; 3rd control valve is three-position four-way valve, and the first cartridge valve, the second cartridge valve are connected with the first actuator port of the 3rd control valve jointly with the control mouth of the 3rd cartridge valve; 4th cartridge valve, the 5th cartridge valve are connected with the second actuator port of the 3rd control valve jointly with the control mouth of the 6th cartridge valve; When 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 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 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.
Present invention also offers a kind of concrete pumping machinery, comprise aforesaid pumping system.
According to concrete pumping system of the present invention and concrete pumping machinery, by arranging maintenance oil circuit control, and overhaul oil circuit control and comprise the oil-feed of one of both the rodless cavity of control first master cylinder and rod chamber, first control valve of the two another oil extraction, and control the oil-feed of one of both the rodless cavity of the second master cylinder and rod chamber, the second control valve of the two another oil extraction.Namely the first master cylinder and the second master cylinder are independently controlled by two control valves, in maintenance process, control two control valves and make the equal oil-feed of the rod chamber of the first master cylinder and the second master cylinder, the equal oil extraction of rodless cavity, two concrete cylinder pistons are all returned in water tank, easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.After maintenance completes, two master cylinders independently control, and can easily make two master cylinders be returned to the working state that stretches a contracting.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, 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 repair process schematic diagram according to concrete pumping system of the present invention.
Embodiment
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
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, first master cylinder 5 and the second master cylinder 6, and connecting the first working connection 3 of main reversing valve group 2 and the first master cylinder 5 and the second working connection 4 being connected main reversing valve group 2 and the second master cylinder 6, main oil pump 1 drives the first master cylinder 5 and the second master cylinder 6 pumping work by main reversing valve group 2; Concrete pumping system also comprises the maintenance oil circuit control with the first working connection 3 and the separate control of the second working connection 4, maintenance oil circuit control comprises an oil-feed in both rodless cavity 5A of control first master cylinder 5 and rod chamber 5B, first control valve 18A of another oil extraction in the two, and the oil-feed controlled in both rodless cavity 6A of the second master cylinder 6 and rod chamber 6B, the second control valve 18B of another oil extraction in the two.Namely the present invention independently overhauls oil circuit control by arranging; the first master cylinder 5 and the second master cylinder 6 is controlled with independent; concrete pumping system is in maintenance down process; the first control valve 18A and the second control valve 18B can be controlled 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, two concrete cylinder pistons are all returned in water tank; easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.And after maintenance completes, two control valves 18A, 18B are controlled to control the oil-feed state of two master cylinders by independent, two master cylinders easily can be made to be returned to the working state that stretches a contracting, to carry out normal pumping work next time to enable this concrete pumping system.
Preferably, first control valve 18A and the second control valve 18B is three-position four-way valve, first control valve 18A comprises the first actuator port, the second actuator port, pressure oil port and return opening, first actuator port of the first control valve 18A is connected by the rodless cavity 5A of oil pipe with the first master cylinder 5, and second actuator port of the first control valve 18A is connected by the rod chamber 5B of oil pipe with the first master cylinder 5; Similarly, second control valve 18B also comprises the first actuator port, the second actuator port, pressure oil port and return opening, first actuator port of the second control valve 18B is connected by the rodless cavity 6A of oil pipe with the second master cylinder 6, and second actuator port of the second control valve 18B is connected by the rod chamber 6B of oil pipe with the second master cylinder 6.First control valve 18A is connected with pressure oil-source with the pressure oil port of the second control valve 18B, and the first control valve 18A is connected with oil sump tank with the return opening of the second control valve 18B.Namely the first control valve 18A independently controls the flexible of the first master cylinder 5, second control valve 18B independently controls the flexible of the second master cylinder 6, in concrete pumping system maintenance down process, independently can control two master cylinders to retract simultaneously, thus drive the concrete piston of two concrete cylinders to retract, also can control two oil cylinders to stretch out, two master cylinders can also be controlled and reset to the original state that stretches a contracting, compared to existing technology, once can only change or overhaul one, the present invention is by simple architecture advances, once can 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 is O type three-position four-way valve.Namely the first control valve 18A and the second control valve 18B is 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 by the impact of maintenance 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 Direct driver, the present invention is in maintenance process, the first master cylinder 5 and the second master cylinder 6 fore and aft motion is driven by the first control valve 18A of little latus rectum and the second control valve 18B, stretching speed is lower, within the scope of safe speed, prevents velocity of piston 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, such as, being realized by 6 cartridge valves shown in Fig. 6.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, thus the rod chamber of two master cylinders can be made all not to be communicated with rodless cavity, make two master cylinders independent, namely two master cylinders do not have UNICOM chamber, accurately control two master cylinders when being more conducive to upkeep operation by maintenance oil circuit control.In figure 6, the 3rd control valve 17 is P type three-position four-way valve, when meta, two actuator ports are all communicated with pressure oil port, 6 cartridge valves are all closed, and the first working connection 3 and the second working connection 4 do not work, and maintenance oil circuit control controls the first master cylinder 5 and the second master cylinder 6 overhauls.
Particularly, shown in composition graphs 6, its working state is described:
1, when the 3rd control valve 17 (P type three-position four-way valve) is in 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 5A of the first master cylinder 5 and rodless cavity 6A of the second master cylinder 6 connects and forms UNICOM chamber, and now pumping system is in low pressure pumping state;
2, when the 3rd control valve 17 (P type three-position four-way valve) is in 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 5B of the first master cylinder 5 and rod chamber 6B of the second master cylinder 6 connects and forms UNICOM chamber, and now pumping system is in high pressure pumping state;
3, when the 3rd control valve 17 (P type three-position four-way valve) is in meta, 6 cartridge valves of high pressure control valve group 15A and low-pressure control valve group 15B are all closed, rod chamber and the rodless cavity of the first master cylinder 5 and the second master cylinder 6 are all in closed condition, neither form UNICOM chamber also not connect with the first working connection 3, second working connection 4, now pumping system is in non-pumping state, is more conducive to maintenance oil circuit control and accurately controls two master cylinders.
When concrete pump is in low pressure or high pressure pumping state, first control valve 18A (O type three-position four-way valve) and the second control valve 18B (O type three-position four-way valve) is all in meta, first control valve 18A and the second control valve 18B is 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, and the first master cylinder 5 and the second master cylinder 6 are connected pumping work.
Composition graphs 6 and Fig. 7 illustrate maintenance process, first the 3rd control valve 17 (P type three-position four-way valve) is adjusted to meta, concrete pumping system is made to be in non-pumping state, then ball valve 7, the first control valve 18A (O type three-position four-way valve) closing the first master cylinder 5 and the second master cylinder 6 tail end and two actuator ports of the second control valve 18B (O type three-position four-way valve) are connected rod chamber and the rodless cavity of the first master cylinder 5 and the second master cylinder 6 respectively; Controller sends that instruction makes the first control valve 18A be in left position (DT21 obtains electric), the second control valve 18B is 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 retreats in water tank simultaneously; After two concrete piston Inspection and maintenances, controller sends that instruction makes the first control valve 18A (O type three-position four-way valve) be in right position (DT22 obtains electric), the second control valve 18B (O type three-position four-way valve) is 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, promotes the first concrete piston, the second concrete piston extends the first concrete cylinder simultaneously, in the second concrete cylinder.In the present invention, main oil pump 1 provides pressure oil for system, and main reversing valve group 2 controls the flow direction in the first working connection 3, second working connection 4 thus controls two master cylinders series connection pumping work.
Present invention also offers a kind of concrete pumping machinery, comprise aforesaid concrete pumping system, in maintenance process, the concrete piston be connected with two master cylinders can be made simultaneously back to water tank, 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 achieve following technique effect:
According to concrete pumping system of the present invention and concrete pumping machinery, by arranging maintenance oil circuit control, and overhaul oil circuit control and comprise the oil-feed of one of both the rodless cavity of control first master cylinder and rod chamber, first control valve of the two another oil extraction, and control the oil-feed of one of both the rodless cavity of the second master cylinder and rod chamber, the second control valve of the two another oil extraction.Namely the first master cylinder and the second master cylinder are independently controlled by two control valves, in maintenance process, control two control valves and make the equal oil-feed of the rod chamber of the first master cylinder and the second master cylinder, the equal oil extraction of rodless cavity, two concrete cylinder pistons are all returned in water tank, easy access concrete piston, concrete cylinder or master cylinder, reduce the plant maintenance time effectively.After maintenance completes, two master cylinders independently control, and can easily make two master cylinders be returned to the working state that stretches 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 amendment done, equivalent replacement, improvement etc., all should be included within 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 connecting first working connection (3) of described main reversing valve group (2) and described first master cylinder (5) and the second working connection (4) being connected described main reversing valve group (2) and described second master cylinder (6), described main oil pump (1) drives described first master cylinder (5) and described second master cylinder (6) pumping work by described main reversing valve group (2);
It is characterized in that, described concrete pumping system also comprises the maintenance oil circuit control with described first working connection (3) and described second working connection (4) separate control, described maintenance oil circuit control comprises an oil-feed in both the rodless cavity (5A) and rod chamber (5B) controlling described first master cylinder (5), 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 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 first control valve (18A) is three-position four-way valve, comprises the first actuator port be connected with the rodless cavity (5A) of described first master cylinder (5), the second actuator port be connected with the rod chamber (5B) of described first master cylinder (5), the pressure oil port be connected with oil pump and the return opening be connected with fuel tank;
Described second control valve (18B) is three-position four-way valve, comprises the first actuator port be connected with the rodless cavity (6A) of described second master cylinder (6), the second actuator port be connected with the rod chamber (6B) of described second master cylinder (6), the pressure oil port be connected with described oil pump and the return opening be connected with described fuel tank.
3. concrete pumping system according to claim 2, is characterized in that,
Described first control valve (18A) and described 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 first control valve (18A) is less than the latus rectum of described main reversing valve group (2);
The latus rectum of described second control valve (18B) is less than the latus rectum of described main reversing valve group (2).
5. concrete pumping system according to any one of claim 1 to 4, is characterized in that,
Described concrete pumping system also comprises the 3rd control valve (17);
Described 3rd control valve (17) has the first working state that the described concrete pumping system of control 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 3rd control valve (17) is positioned at described 3rd working state, described first working connection (3) and described second working connection (4) quit work, and described maintenance oil circuit control controls described 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 3rd control valve (17) is positioned at described 3rd working state, described first control valve (18A) and described second control valve (18B) have the second state controlling the first state that described first master cylinder (5) and described second master cylinder (6) retreat simultaneously and described first master cylinder (5) of control and described second master cylinder (6) and advance simultaneously.
7. concrete pumping system according to claim 5, is characterized in that,
Described 3rd control valve (17) is when described first working state, described first working connection (3) is connected with the rodless cavity (5A) of described first master cylinder (5), described second working connection (4) is connected with the rodless cavity (6A) of described second master cylinder (6), and the rod chamber (5B) of described first master cylinder (5) is connected with the rod chamber (6B) of the second master cylinder (6);
Described 3rd control valve (17) is when described second working state, described first working connection (3) is connected with the rod chamber (5B) of described first master cylinder (5), described second working connection (4) is connected with the rod chamber (6B) of described second master cylinder (6), and the rodless cavity (5A) of described first master cylinder (5) is connected with the rodless cavity (6A) of the second master cylinder (6).
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,
First connecting port of described first cartridge valve is connected with described first working connection (3), and the second connecting port of described first cartridge valve is connected with the rodless cavity (5A) of described first master cylinder (5);
First connecting port of described second cartridge valve is connected with described second working connection (4), and the second connecting port of described second cartridge valve is connected with the rodless cavity (6A) of described second master cylinder (6);
First connecting port of described 3rd cartridge valve is connected with the rod chamber (5B) of described first master cylinder (5), and the second connecting port of described 3rd cartridge valve is connected with the rod chamber (6B) of described 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,
First connecting port of described 4th cartridge valve is connected with described first working connection (3), and the second connecting port of described 4th cartridge valve is connected with the rod chamber (5B) of described first master cylinder (5);
First connecting port of described 5th cartridge valve is connected with described second working connection (4), and the second connecting port of described 5th cartridge valve is connected with the rod chamber (6B) of described second master cylinder (6);
First connecting port of described 6th cartridge valve is connected with the rodless cavity (5A) of described first master cylinder (5), and the second connecting port of described 6th cartridge valve is connected with the rodless cavity (6A) of described second master cylinder (6);
Described 3rd control valve (17) is three-position four-way valve, and described first cartridge valve, described second cartridge valve are connected with the first actuator port of described 3rd control valve (17) jointly with the control mouth of described 3rd cartridge valve; Described 4th cartridge valve, described 5th cartridge valve are connected with the second actuator port of described 3rd control valve (17) jointly with the control mouth of described 6th cartridge valve;
When described 3rd control valve (17) is positioned at described first working state, described high pressure control valve group (15A) is opened and described low-pressure control valve group (15B) is closed; When described 3rd control valve (17) is positioned at described second working state, described high pressure control valve group (15A) is closed and described low-pressure control valve group (15B) is opened; When described 3rd control valve (17) is positioned at described 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 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, the concrete pumping system of described pumping system according to any one of claim 1 to 9.
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| CN201310652720.1A CN103671315B (en) | 2013-12-05 | 2013-12-05 | Concrete pumping system and concrete pumping machine |
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| CN201310652720.1A CN103671315B (en) | 2013-12-05 | 2013-12-05 | Concrete pumping system and concrete pumping machine |
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| CN107120261B (en) * | 2017-06-19 | 2018-09-21 | 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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| DE3030005C2 (en) * | 1980-08-08 | 1987-04-02 | Maschinenfabrik Walter Scheele GmbH & Co KG, 4750 Unna-Massen | Hydraulic drive for a two-cylinder concrete pump |
| KR100281932B1 (en) * | 1998-10-10 | 2001-09-22 | 양재신 | Drive cylinder hydraulics |
| CN100392247C (en) * | 2006-04-25 | 2008-06-04 | 甄继 | Concrete continuous pumping delivery method and concrete pump appts |
| CN201661532U (en) * | 2010-04-02 | 2010-12-01 | 北京华强京工机械制造有限公司 | Hydraulic pumping system of concrete pump |
| CN102269157B (en) * | 2011-06-08 | 2013-03-20 | 中联重科股份有限公司 | Pressure adjusting method and system of concrete pumping equipment and concrete pumping equipment |
| CN102312873B (en) * | 2011-08-19 | 2013-03-20 | 中联重科股份有限公司 | Concrete pump truck and hydraulic control system thereof |
| CN102840123B (en) * | 2012-09-19 | 2015-09-30 | 中联重科股份有限公司 | Anti-channeling shutdown method for double-cylinder pumping system, double-cylinder pumping system and pumping equipment |
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