CN204003763U - Hydraulic system of concrete pumping machine and concrete pumping machine - Google Patents
Hydraulic system of concrete pumping machine and concrete pumping machine Download PDFInfo
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- CN204003763U CN204003763U CN201420487293.6U CN201420487293U CN204003763U CN 204003763 U CN204003763 U CN 204003763U CN 201420487293 U CN201420487293 U CN 201420487293U CN 204003763 U CN204003763 U CN 204003763U
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- 238000005086 pumping Methods 0.000 title claims abstract description 276
- 239000012530 fluid Substances 0.000 claims description 66
- 239000002828 fuel tank Substances 0.000 claims description 57
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- 238000012986 modification Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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Abstract
The utility model provides a concrete pumping machinery hydraulic system and concrete pumping machinery, this hydraulic system includes: the closed type rotary pump comprises two pumping oil cylinders and a closed type rotary pump, wherein each pumping oil cylinder comprises a cylinder body and a piston rod with a third cavity, the piston connected with the piston rod divides the cylinder body into a first cavity and a second cavity, the cavity where the piston rod is located is the second cavity, the second cavities of the two pumping oil cylinders are communicated, the first cavity and the third cavity of one pumping oil cylinder are connected with the closed type rotary pump and an oil tank through a reversing valve, and the first cavity and the third cavity of the other pumping oil cylinder are connected with the closed type rotary pump and the oil tank through the reversing valve. In the technical scheme, the pumping oil cylinder is of a structure with the first cavity and the third cavity, and conversion of high-pressure and low-pressure pumping is achieved by changing oil supply conditions of the first cavity and the third cavity, so that a pumping oil way is simplified, conversion difficulty of the pumping oil way is reduced, and stability of the oil way is improved.
Description
Technical field
The utility model relates to the technical field of hydraulic system, refers more particularly to a kind of concrete pumping machinery hydraulic system and concrete pumping machinery.
Background technique
In Current Engineering Construction, need to carry a large amount of concrete, generally adopt pumping equipment to carry as towed concrete pump, truck mounted concrete pump, concrete mixer etc.
In construction, construction operating mode is often very complicated, and when carrying different distance or carrying the concrete of the different trades mark, required concrete pumping pressure alters a great deal, and meanwhile, under different operating modes, the requirement of pumping side's amount is also different.This just requires pumping equipment can adapt to the delivery pressure scope of wide range and pumping side's weight range of wide range.Be subject to the restriction of power, generally adopt high low pressure conversion to realize.In the time that system is in high pressure conditions, concrete pumping pressure is higher, but output side's amount is less.In the time that system is in low pressure pumping state, concrete pumping pressure is lower, but output side's amount is larger.
Generally adopt at present the series connection of two double-action single-piston rod oil cylinders, enter rodless cavity body or rod chamber body and realize the conversion of high pressure or low pressure by changing pressure oil.
As shown in Figure 1, when the rodless cavity body of two pumping oil cylinders 1,2 is communicated with, when rod chamber body leads to two actuator port of enclosed pump 3, pressure oil acts on rod chamber body, because rod chamber body effective active area is less, now concrete pumping pressure is less, but the pumping side of output amount is larger.
As shown in Figure 2, when the rod chamber body of two pumping oil cylinders 1,2 is communicated with, when rodless cavity body leads to two actuator port of enclosed pump 3, pressure oil acts on rodless cavity body, because rodless cavity body effective active area is larger, now concrete pumping pressure is higher, but the pumping side of output amount is less.
Existing pumping mechanism high low pressure conversion regime generally has following several:
One, change by changing sebific duct link position,, in the time carrying out high low pressure conversion, need again take over, realize the transformation of oil circuit Placement.
Two, adopt the form of rotary valve.While carrying out high low pressure conversion, need artificial unloading to rotate manifold block, realize the communication of high low pressure oil circuit.
Three, automatic high/low pressure conversion, utilizes six cartridge valves to realize high low pressure and automatically changes.
There is following defect in existing pumping mechanism:
One, in the time carrying out high low pressure conversion, come with some shortcomings:
(1) as changed by changing sebific duct link position, workload is large, time-consuming, and can cause fluid to run off and oil contamination when dismounting.
(2) form that adopts rotary valve more for convenience, but needs artificial unloading equally, and can cause fluid to run off and oil contamination when dismounting.
(3) while adopting automatic high/low pressure conversion regime, although comparatively efficient and convenient, but the coupling of six cartridge valves, the leakage of cartridge valve can affect again systematic function (because the leakage of cartridge valve can affect the oil mass that is communicated with cavity, and then affect stroke), also more difficult eliminating when cartridge valve is out of order simultaneously.
Two, when existing pumping mechanism low pressure pumping, pumping oil cylinder rodless cavity body flow, much larger than pump duty, causes valve specification and oil circuit specification to increase, and cost increases, and in the time not increasing valve and oil circuit specification, the pressure loss is larger.
Three, when existing pumping mechanism low pressure pumping, pumping cylinder rod chamber body also needs to bear high pressure, and decrease sealing life.
Four, existing pumping organization hydraulic pressure stringing complexity.The pressure oil of oil pump all needs to be connected with oil circuit, valve with two cavitys of pumping oil cylinder, and two cavitys of pumping oil cylinder all need to be connected with oil circuit, valve with fuel tank, pipeline complexity, and cloth pipe range, the oil hydraulic circuit pressure loss is large.
Model utility content
The utility model provides a kind of concrete pumping machinery hydraulic system and concrete pumping machinery, the problem when solving the pumping oil cylinder when commutation high low pressure conversion that has concrete pumping equipment in prior art.
The utility model provides a kind of concrete pumping machinery hydraulic system, and this concrete pumping machinery hydraulic system comprises: two pumping oil cylinders and there is the closed rotary pump of two hydraulic fluid ports, wherein,
Described pumping oil cylinder comprises cylinder body, be arranged on the piston rod with hollow cavity in described cylinder body, and be sleeved on the hollow plunger in the hollow cavity of described piston rod, and described hollow plunger is fixedly connected with described cylinder body, and the cavity of described hollow plunger is communicated with described hollow cavity; Wherein, the cavity of cylinder body is divided into the first cavity and the second cavity by the piston being connected with described piston rod, and the cavity at described piston rod place is the second cavity, and another cavity is the first cavity, and the hollow cavity in described piston rod is the 3rd cavity;
The second cavity of described two pumping oil cylinders is communicated with, the first cavity of one of them pumping oil cylinder and the 3rd cavity are connected by hydraulic fluid port or the fuel tank of selector valve and closed rotary pump, and the first cavity of another pumping oil cylinder is optionally connected with another hydraulic fluid port or the fuel tank of closed rotary pump by selector valve with the 3rd cavity.
In technique scheme, effect cavity in the time that pumping oil cylinder is realized high pressure and low-pressure delivery is the first chamber and the 3rd cavity, above-mentioned two cavitys are all positioned at a side relative with there being rod chamber, in the time that high low pressure is changed, two the second cavitys are communicated with the space that forms a sealing, without the oil circuit in change the second chamber, only need oil-feed and the fuel-displaced conversion that can realize high low pressure of change the first cavity or the 3rd cavity, the fuel feeding situation of changing the first cavity and the 3rd cavity by selector valve can realize high pressure pumping and low pressure pumping, in said structure, because pumping oil cylinder adopts the structure with the first cavity and the 3rd cavity, and employing realizes the conversion of high low pressure pumping by the fuel feeding situation of the first cavity and the 3rd cavity, thereby simplify pumping oil circuit, reduce the conversion difficulty of pumping oil circuit, improve the stability of oil circuit.
Preferably, described hydraulic system comprises high pressure pumping state and low pressure pumping state;
In the time of high pressure pumping state, described closed rotary pump is at least one the cavity fuel feeding in the first cavity and the 3rd cavity of a described pumping oil cylinder wherein, and in the time adopting to a cavity fuel feeding in the first cavity and the 3rd cavity, effective oil pressure area of the cavity of described employing is greater than effective oil pressure area of another cavity, and another cavity is communicated with fuel tank;
In the time of low pressure pumping state, described closed rotary pump is an effective little cavity fuel feeding of oil pressure area in the first cavity of a described pumping oil cylinder and the 3rd cavity wherein.By adopting the first cavity and the 3rd cavity as the effect cavity of high pressure pumping or adopting cavity that in the first cavity and the 3rd cavity, area the is larger cavity as high pressure pumping.
Preferably, described selector valve is two-position four way change valve, and the first hydraulic fluid port of described two-position four way change valve is communicated with closed rotary pump, and the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of pumping oil cylinder; In the time that described two-position four way change valve is positioned at right position, described closed rotary pump is communicated with the first cavity of described pumping oil cylinder, the 3rd cavity of described fuel tank and described pumping oil cylinder; In the time that described two-position four way change valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder, can pass through two-position four way change valve conducting.
Preferably, described selector valve is three position four-way directional control valve, and the first hydraulic fluid port of described three position four-way directional control valve is communicated with closed rotary pump, and the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of described pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at right position, described closed rotary pump is communicated with the first cavity of described pumping oil cylinder, and described fuel tank is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at meta, described closed rotary pump is communicated with described fuel tank; In the time that described three position four-way directional control valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder, can pass through three position four-way electromagnetic valve conducting.
Preferably, described selector valve is three position four-way directional control valve, and the first hydraulic fluid port of described three position four-way directional control valve is communicated with closed rotary pump, and the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of described pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at meta, described closed rotary pump is communicated with described fuel tank; In the time that described three position four-way directional control valve is positioned at right position, described closed rotary pump is communicated with the 3rd cavity and first cavity of described pumping oil cylinder, can pass through three position four-way directional control valve conducting.
Preferably, described pumping oil cylinder also comprises: be arranged on the one end at described piston rod place and the front cover that also described cylinder body is fixedly connected with, be fixed on the gland on described front cover, and be arranged on one end relative with described piston rod and be fixedly connected with described cylinder body rear end cover.Improve the stability of the structure of pumping oil cylinder.
The utility model also provides a kind of concrete pumping machinery, and this concrete pumping machinery comprises the concrete pumping machinery hydraulic system described in above-mentioned any one.
In such scheme, by selecting above-mentioned hydraulic system, thereby simplify the structure of the hydraulic system in whole concrete pumping machinery, reduce difficulty when high low pressure is changed, improve the working efficiency of equipment.
Brief description of the drawings
Fig. 1 is the structural representation of concrete pumping machinery hydraulic system in prior art;
Fig. 2 is another structural representation of concrete pumping machinery hydraulic system in prior art;
The structural representation of the concrete pumping machinery hydraulic system that Fig. 3 provides for the utility model embodiment;
Another structural representation of the concrete pumping machinery hydraulic system that Fig. 4 provides for the utility model embodiment;
Another structural representation of the concrete pumping machinery hydraulic system that Fig. 5 provides for the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
As shown in Fig. 3, Fig. 4 and Fig. 5, Fig. 3, Fig. 4 and Fig. 5 show the structural representation of the concrete pumping machinery hydraulic system that the present embodiment provides.For convenience of description, in figure, represent respectively the first cavity, the second cavity and the 3rd cavity with A, B, C.
The utility model embodiment provides a kind of concrete pumping machinery hydraulic system, and this hydraulic system comprises: two pumping oil cylinders 20 and there is the closed rotary pump 10 of two hydraulic fluid ports, wherein,
Described pumping oil cylinder 20 comprises cylinder body 23, be arranged on the piston rod with hollow cavity 25 in described cylinder body 23, and be sleeved on the hollow plunger 21 in the hollow cavity of described piston rod 25, and described hollow plunger 21 is fixedly connected with described cylinder body 23, and the cavity of described hollow plunger 21 is communicated with described hollow cavity; Wherein, the cavity of cylinder body 23 is divided into the first cavity D and the second cavity E by the piston 24 being connected with described piston rod 25, the cavity at described piston rod 25 places is the second cavity E, and another cavity is the first cavity D, and the hollow cavity in described piston rod 25 is the 3rd cavity F;
The second cavity E of described two pumping oil cylinders 20 is communicated with, the first cavity D of one of them pumping oil cylinder 20 and the 3rd cavity F are optionally connected with hydraulic fluid port and the fuel tank of closed rotary pump 10 by selector valve 30, and the first cavity D of another pumping oil cylinder 20 is optionally connected with another hydraulic fluid port and the fuel tank of closed rotary pump 10 by selector valve 30 with the 3rd cavity F.
In the above-described embodiments, two second cavity E (being equivalent to rod chamber of the prior art) of the pumping oil cylinder 20 adopting are communicated with, effect cavity in the time that pumping oil cylinder 20 is realized high pressure or low-pressure delivery is the first cavity D and the 3rd cavity F, above-mentioned two cavitys are all positioned at a side relative with rod chamber, in the time that high low pressure is changed, two the second cavity E are communicated with the space that forms a sealing, without the oil circuit of change the second cavity E, the fuel feeding situation that only need change the first cavity D and the 3rd cavity F by selector valve 30 can realize high pressure pumping and low pressure pumping, in said structure, because pumping oil cylinder 20 adopts the structure with the first cavity D and the 3rd cavity F, and employing realizes the conversion of high low pressure pumping by the fuel feeding situation of the first cavity D and the 3rd cavity F, thereby simplify pumping oil circuit, reduce the conversion difficulty of pumping oil circuit, improve the stability of oil circuit.
Wherein, described pumping oil cylinder 20 also comprises: be arranged on the one end at described piston rod 25 places and the front cover 26 that also described cylinder body 23 is fixedly connected with, be fixed on the gland on described front cover 26, and be arranged on one end relative with described piston rod 25 and be fixedly connected with described cylinder body 23 rear end cover 22.Strengthen the stability of the structure of whole cylinder body 23.
Closed rotary pump 10 is wherein enclosed pump, and good power can be provided.
Concrete, described hydraulic system comprises high pressure pumping state and low pressure pumping state;
In the time of high pressure pumping state, described closed rotary pump 10 is at least one the cavity fuel feeding in the first cavity D and the 3rd cavity F of a described pumping oil cylinder wherein, and in the time adopting to a cavity fuel feeding in the first cavity D and the 3rd cavity F, effective oil pressure area of the cavity of described employing is greater than effective oil pressure area of another cavity, and another cavity is communicated with fuel tank; In the time of low pressure pumping state, described closed rotary pump 10 is an effective little cavity fuel feeding of oil pressure area in the first cavity D of a described pumping oil cylinder and the 3rd cavity F wherein.Cavity when adopting the first cavity D and the 3rd cavity F as high pressure pumping, or cavity while adopting cavity that in the first cavity D and the 3rd cavity F, effectively oil pressure area is larger as high pressure pumping.
In the above-described embodiments, structure is set and adopts different selector valve 30 all can realize the conversion to high low pressure pumping output by the difference of the first cavity D and the 3rd cavity F, for the understanding of the convenient hydraulic system that the present embodiment is provided, below in conjunction with specific embodiment, the present embodiment is described.For convenience of description, two pumping oil cylinders 20 called after the first pumping oil cylinder 40 and the second pumping oil cylinder 50 respectively.
Embodiment 1
The first cavity D in the present embodiment is different with effective oil pressure area of the 3rd cavity F, and the effective oil pressure area that is greater than the 3rd cavity F taking effective oil pressure area of the first cavity D for convenience of description describes as example.
The selector valve 30 that the present embodiment provides can adopt the selector valve of different structure, illustrates below in conjunction with accompanying drawing.
As shown in Figure 3, selector valve 30 adopts two-position four way change valve 31, the first hydraulic fluid port of two-position four way change valve 31 is communicated with closed rotary pump 10, the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity D of pumping oil cylinder 20, the 4th hydraulic fluid port is communicated with the 3rd cavity F of pumping oil cylinder 20, and now, concrete pumping machinery is realized high pressure pumping; In the time that two-position four way change valve 31 is positioned at right position, closed rotary pump 10 is communicated with the first cavity D of pumping oil cylinder 20, the 3rd cavity F of fuel tank and pumping oil cylinder 20; In the time that two-position four way change valve 31 is positioned at left position, closed rotary pump 10 is communicated with the 3rd cavity F of pumping oil cylinder 20, and fuel tank is communicated with the first cavity D of pumping oil cylinder 20.Now, concrete pumping machinery is realized low pressure pumping.
Concrete, the first hydraulic fluid port of selector valve 30 is P mouth, and the second hydraulic fluid port is T mouth, and the 3rd hydraulic fluid port is A mouth, the 4th hydraulic fluid port is B mouth, in the time of concrete connection, two selector valves 30 are respectively the first selector valve and the second selector valve, wherein, the P mouth of the first selector valve is connected to a hydraulic fluid port of closed rotary pump 10, T mouth is connected with fuel tank, and A mouth is connected with the first cavity D of the first pumping oil cylinder 40, and B mouth is connected with the 3rd cavity F of the first pumping oil cylinder 40.The P mouth of the second selector valve is connected to another hydraulic fluid port of closed rotary pump 10, and T mouth is connected with fuel tank, and A mouth is connected with the first cavity D of the second pumping oil cylinder 50, and B mouth is connected with the 3rd cavity F of the second pumping oil cylinder 50.
In use, original state is: the piston rod 25 of the first pumping oil cylinder 40 bounces back, the piston rod 25 of the second pumping oil cylinder 50 reaches working position, when with high pressure pumping, two selector valves 30 are all positioned at right position, now, two of closed rotary pump 10 hydraulic fluid ports are communicated with the first cavity D of the first pumping oil cylinder 40 and the first cavity D of the second pumping oil cylinder 50 by selector valve 30 respectively.In the time of specific works, when closed rotary pump 10 forward, closed rotary pump 10 is to fuel feeding in the first cavity D of the first pumping oil cylinder 40, under the effect of oil pressure, piston rod 25 stretches out, now, the 3rd cavity F of the first pumping oil cylinder 40 is communicated with fuel tank, and the 3rd cavity F of the second pumping oil cylinder 50 is also communicated with fuel tank.Due to siphonage, oil in fuel tank be inhaled into the first pumping oil cylinder 40 in the 3rd cavity F, oil in the second cavity E of the first pumping oil cylinder 40 is pressed in the second cavity E of the second pumping oil cylinder 50, under the effect of the oil pressure in the second cavity E of the second pumping oil cylinder 50, the piston rod 25 of the second pumping oil cylinder 50 bounces back, now, oil in the first cavity D of the second pumping oil cylinder 50 is pressed in closed rotary pump 10, oil in the 3rd cavity F is pressed into fuel tank, in the time that piston rod 25 contractions of the second pumping oil cylinder 50 put in place, closed rotary pump 10 reverses, closed rotary pump 10 is to the first cavity D fuel feeding of the second pumping oil cylinder 50, the second pumping oil cylinder 50 repeats the action of above-mentioned the first pumping oil cylinder 40, complete a pump cycles, in whole high pressure pumping procedure, by the continuous commutation of closed rotary pump 10, the pumping of periodically having stretched of the flexible rod of realizing the first pumping oil cylinder 40 and the second pumping oil cylinder 50.
When with low pressure pumping, two selector valves 30 are all positioned at left position, a hydraulic fluid port of closed rotary pump 10 is communicated with the 3rd cavity F of the first pumping oil cylinder 40 by the first selector valve, and another hydraulic fluid port is communicated with the 3rd cavity F of the second pumping oil cylinder 50 by the second selector valve.In the time of specific works, when closed rotary pump 10 forward, closed rotary pump 10 is to fuel feeding in the 3rd cavity F of the first pumping oil cylinder 40, under the effect of oil pressure, the piston rod 25 of the first pumping oil cylinder 40 stretches out, now, the first cavity D and fuel tank of the first pumping oil cylinder 40, the first cavity D of the second pumping oil cylinder 50 is also communicated with fuel tank.Due to siphonage, oil in fuel tank is drawn in the first cavity D of the first pumping oil cylinder 40, oil in the second cavity E of the first pumping oil cylinder 40 is pressed in the second cavity E of the second pumping oil cylinder 50, under the effect of the oil pressure in the second cavity E, the piston rod 25 of the second pumping oil cylinder 50 bounces back, now, the oil in the 3rd cavity F of the second pumping oil cylinder 50 is pressed in closed rotary pump 10, and the oil in the first cavity D is pressed in fuel tank.In the time that piston rod 25 contractions of the second pumping oil cylinder 50 put in place, closed rotary pump 10 reverses, closed rotary pump 10 is to the 3rd cavity F fuel feeding of the second pumping oil cylinder 50, the second pumping oil cylinder 50 repeats the action of above-mentioned the first pumping oil cylinder 40, complete a pump cycles, in whole high pressure pumping procedure, by the continuous commutation of closed rotary pump 10, the pumping of periodically having stretched of the flexible rod of realizing the first pumping oil cylinder 40 and the second pumping oil cylinder 50.
As shown in Figure 4, selector valve 30 is three position four-way directional control valve 32, and the first hydraulic fluid port of three position four-way directional control valve 32 is communicated with closed rotary pump 10, and the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity D of pumping oil cylinder 20, and the 4th hydraulic fluid port is communicated with the 3rd cavity F of pumping oil cylinder 20; In the time that three position four-way directional control valve 32 is positioned at right position, closed rotary pump 10 is communicated with the first cavity D of pumping oil cylinder 20, and fuel tank is communicated with the 3rd cavity F of pumping oil cylinder 20; In the time that three position four-way directional control valve 32 is positioned at meta, closed rotary pump 10 is communicated with fuel tank; In the time that three position four-way directional control valve 32 is positioned at left position, closed rotary pump 10 is communicated with the 3rd cavity F of pumping oil cylinder 20, and fuel tank is communicated with the first cavity D of pumping oil cylinder 20.
In the time adopting three position four-way directional control valve, when its conducting, identical with the conduction mode of two-position four-way valve 31, this is no longer going to repeat them, unique difference of this three position four-way directional control valve and above-mentioned two-position four-way valve 31 has been to increase the cut-off position of meta, in the time that above-mentioned three position four-way directional control valve is positioned at meta, closed rotary pump 10 is communicated with fuel tank, now, closed rotary pump 10 is unloaded, the first cavity D and the 3rd cavity F of the first pumping oil cylinder 40 and the second pumping oil cylinder 50 are all cut off, thereby while having ensured that closed rotary pump 10 is unloaded, the first pumping oil cylinder 40 and the second pumping oil cylinder 50 can keep oil pressure, the situation of cylinder of avoiding occurring slipping occurs, improve Security.
Embodiment 2
In the present embodiment, effective oil pressure area of the first cavity D and effective oil pressure area of the 3rd cavity F can adopt identical, also can adopt not identically, and its concrete structure is determined according to actual situation.
As shown in Figure 5, in said structure, the selector valve 30 adopting is three position four-way directional control valve 32, the first hydraulic fluid port of three position four-way directional control valve 32 is communicated with closed rotary pump 10, the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity D of pumping oil cylinder 20, and the 4th hydraulic fluid port is communicated with the 3rd cavity F of pumping oil cylinder 20; In the time that three position four-way directional control valve 32 is positioned at left position, closed rotary pump 10 is communicated with the 3rd cavity D of pumping oil cylinder 20, and fuel tank is communicated with the first cavity D of pumping oil cylinder 20; In the time that three position four-way directional control valve 32 is positioned at meta, closed rotary pump 10 is communicated with fuel tank; In the time that three position four-way directional control valve 32 is positioned at right position, closed rotary pump 10 is communicated with the 3rd cavity F and the first cavity D of pumping oil cylinder 20.
The first hydraulic fluid port of selector valve 30 is P mouth, the second hydraulic fluid port is T mouth, the 3rd hydraulic fluid port is A mouth, and the 4th hydraulic fluid port is B mouth, in the time of concrete connection, two selector valves 30 are respectively the 3rd selector valve and the 4th selector valve, wherein, the P mouth of the 3rd selector valve is connected to a hydraulic fluid port of closed rotary pump 10, and T mouth is connected with fuel tank, A mouth is connected with the first cavity D of the first pumping oil cylinder 40, and B mouth is connected with the 3rd cavity F of the first pumping oil cylinder 40.The P mouth of the 4th selector valve is connected to another hydraulic fluid port of closed rotary pump 10, and T mouth is connected with fuel tank, and A mouth is connected with the first cavity D of the second pumping oil cylinder 50, and B mouth is connected with the 3rd cavity F of the second pumping oil cylinder 50.
In the time of specific works, original state is: the piston rod 25 of the first pumping oil cylinder 40 bounces back, the piston rod 25 of the second pumping oil cylinder 50 reaches working position, when with high pressure pumping, two selector valves 30 are all positioned at right position, and now, the P mouth of selector valve 30 and A mouth and B mouth are communicated with, a hydraulic fluid port that is closed rotary pump 10 is communicated with the first cavity D and the 3rd cavity F of the first pumping oil cylinder 40 simultaneously, and another hydraulic fluid port is communicated with the first cavity D and the 3rd cavity F of the second pumping oil cylinder simultaneously.In the time of specific works, when closed rotary pump 10 forward, closed rotary pump 10 is to the first cavity D and the 3rd cavity F fuel feeding of the first pumping oil cylinder 40, under the effect of oil pressure, piston rod 25 stretches out, now, oil in the second cavity E of the first pumping oil cylinder 40 is pressed in the second cavity E of the second pumping oil cylinder 50, under the effect of the oil pressure in the second cavity E, the piston rod 25 of the second pumping oil cylinder 50 bounces back, now, oil in the first cavity D and the 3rd cavity F of the second pumping oil cylinder 50 is pressed in closed rotary pump 10, in the time that piston rod 25 contractions of the second pumping oil cylinder 50 put in place, closed rotary pump 10 reverses, closed rotary pump 10 is to the first cavity D and the 3rd cavity F fuel feeding of the second pumping oil cylinder 50, the second pumping oil cylinder 50 repeats the action of above-mentioned the first pumping oil cylinder 40, complete a pump cycles, in whole high pressure pumping procedure, by the continuous commutation of closed rotary pump 10, the pumping of periodically having stretched of the flexible rod of realizing the first pumping oil cylinder 40 and the second pumping oil cylinder 50.
When with low pressure pumping, selector valve 30 is positioned at left position, a hydraulic fluid port of closed rotary pump 10 is communicated with the 3rd cavity F of the first pumping oil cylinder 40, the 3rd cavity F of another hydraulic fluid port and the second pumping oil cylinder 50 is communicated with, and the first cavity D of the first pumping oil cylinder 40 and the first cavity D of the second pumping oil cylinder 50 are communicated with fuel tank respectively.In the time of closed rotary pump 10 forward, closed rotary pump 10 is to the 3rd cavity F fuel feeding of the first pumping oil cylinder 40, promoting piston rod 25 stretches out forward, oil in fuel tank flow in the first cavity D of the first pumping oil cylinder 40, and the oil in the second cavity E of the first pumping oil cylinder 40 is pressed in the second cavity E of the second pumping oil cylinder 50, the piston rod 25 that promotes the second pumping oil cylinder 50 bounces back, the oil of the 3rd cavity F of the second pumping oil cylinder 50 flow in closed rotary pump 10, oil in the first cavity D in the second pumping oil cylinder 50 flow in fuel tank, closed rotary pump 10 reverses afterwards, the piston rod 25 of the second pumping oil cylinder 50 stretches out, the piston rod 25 of the first pumping oil cylinder 40 bounces back, complete a circulation.
In the time not needing pumping, selector valve 30 can be adjusted to meta, now, closed rotary pump 10 is communicated with fuel tank, and the first cavity D and the 3rd cavity F of two pumping oil cylinders 20 are cut off, thereby have avoided occurring slipping the situation of cylinder, have improved the Security while use.
Can find out by foregoing description, selector valve 30 in the hydraulic system that the present embodiment provides and the cavity area of pumping oil cylinder 20 can change according to the actual requirements, in the time specifically arranging, can select voluntarily according to demand pattern and the corresponding selector valve 30 of pumping.
The utility model embodiment also provides a kind of concrete pumping machinery, and this concrete pumping machinery comprises the concrete pumping machinery hydraulic system described in above-mentioned any one.
In the above-described embodiments, by selecting above-mentioned hydraulic system, thereby simplify the structure of the hydraulic system in whole concrete pumping machinery, reduced difficulty when high low pressure is changed, improved the working efficiency of equipment.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if these amendments of the present utility model and within modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (7)
1. a concrete pumping machinery hydraulic system, is characterized in that, comprising: two pumping oil cylinders and there is the closed rotary pump of two hydraulic fluid ports, wherein,
Described pumping oil cylinder comprises cylinder body, be arranged on the piston rod with hollow cavity in described cylinder body, and be sleeved on the hollow plunger in the hollow cavity of described piston rod, and described hollow plunger is fixedly connected with described cylinder body, and the cavity of described hollow plunger is communicated with described hollow cavity; Wherein, the cavity of cylinder body is divided into the first cavity and the second cavity by the piston being connected with described piston rod, and the cavity at described piston rod place is the second cavity, and another cavity is the first cavity, and the hollow cavity in described piston rod is the 3rd cavity;
The second cavity of described two pumping oil cylinders is communicated with, the first cavity of one of them pumping oil cylinder and the 3rd cavity all can optionally be connected with hydraulic fluid port or the fuel tank of closed rotary pump by selector valve, and the first cavity of another pumping oil cylinder all can optionally be connected with another hydraulic fluid port or the fuel tank of closed rotary pump by selector valve with the 3rd cavity.
2. concrete pumping machinery hydraulic system as claimed in claim 1, is characterized in that,
Described hydraulic system comprises high pressure pumping state and low pressure pumping state;
In the time of high pressure pumping state, described closed rotary pump is at least one the cavity fuel feeding in the first cavity and the 3rd cavity of a described pumping oil cylinder wherein, and in the time adopting to a cavity fuel feeding in the first cavity and the 3rd cavity, effective oil pressure area of the cavity of described employing is greater than effective oil pressure area of another cavity, and another cavity is communicated with fuel tank;
In the time of low pressure pumping state, described closed rotary pump is an effective little cavity fuel feeding of oil pressure area in the first cavity of a described pumping oil cylinder and the 3rd cavity wherein.
3. concrete pumping machinery hydraulic system as claimed in claim 2, it is characterized in that, described selector valve is two-position four way change valve, the first hydraulic fluid port of described two-position four way change valve is communicated with closed rotary pump, the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of pumping oil cylinder; In the time that described two-position four way change valve is positioned at right position, described closed rotary pump is communicated with the first cavity of described pumping oil cylinder, the 3rd cavity of described fuel tank and described pumping oil cylinder; In the time that described two-position four way change valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder.
4. concrete pumping machinery hydraulic system as claimed in claim 2, it is characterized in that, described selector valve is three position four-way directional control valve, the first hydraulic fluid port of described three position four-way directional control valve is communicated with closed rotary pump, the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of described pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at right position, described closed rotary pump is communicated with the first cavity of described pumping oil cylinder, and described fuel tank is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at meta, described closed rotary pump is communicated with described fuel tank; In the time that described three position four-way directional control valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder.
5. concrete pumping machinery hydraulic system as claimed in claim 2, it is characterized in that, described selector valve is three position four-way directional control valve, the first hydraulic fluid port of described three position four-way directional control valve is communicated with closed rotary pump, the second hydraulic fluid port is communicated with fuel tank, the 3rd hydraulic fluid port is communicated with the first cavity of described pumping oil cylinder, and the 4th hydraulic fluid port is communicated with the 3rd cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at left position, described closed rotary pump is communicated with the 3rd cavity of described pumping oil cylinder, and described fuel tank is communicated with the first cavity of described pumping oil cylinder; In the time that described three position four-way directional control valve is positioned at meta, described closed rotary pump is communicated with described fuel tank; In the time that described three position four-way electromagnetic valve is positioned at right position, described closed rotary pump is communicated with the 3rd cavity and first cavity of described pumping oil cylinder.
6. the concrete pumping machinery hydraulic system as described in claim 1～5 any one, it is characterized in that, described pumping oil cylinder also comprises: be arranged on the one end at described piston rod place and the front cover that also described cylinder body is fixedly connected with, be fixed on the gland on described front cover, and be arranged on one end relative with described piston rod and be fixedly connected with described cylinder body rear end cover.
7. a concrete pumping machinery, is characterized in that, comprises the concrete pumping machinery hydraulic system as described in claim 1～6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420487293.6U CN204003763U (en) | 2014-08-27 | 2014-08-27 | Hydraulic system of concrete pumping machine and concrete pumping machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420487293.6U CN204003763U (en) | 2014-08-27 | 2014-08-27 | Hydraulic system of concrete pumping machine and concrete pumping machine |
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| Publication Number | Publication Date |
|---|---|
| CN204003763U true CN204003763U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420487293.6U Expired - Lifetime CN204003763U (en) | 2014-08-27 | 2014-08-27 | Hydraulic system of concrete pumping machine and concrete pumping machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971862A (en) * | 2016-05-24 | 2016-09-28 | 北汽福田汽车股份有限公司 | Pumping system reversing control method and device |
| CN108561345A (en) * | 2018-01-12 | 2018-09-21 | 中国石油大学(华东) | A kind of positioning power-assisted one-piece cylinder and work system |
| WO2020113952A1 (en) * | 2018-12-03 | 2020-06-11 | 三一汽车制造有限公司 | Pumping mechanical hydraulic system |
-
2014
- 2014-08-27 CN CN201420487293.6U patent/CN204003763U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971862A (en) * | 2016-05-24 | 2016-09-28 | 北汽福田汽车股份有限公司 | Pumping system reversing control method and device |
| CN108561345A (en) * | 2018-01-12 | 2018-09-21 | 中国石油大学(华东) | A kind of positioning power-assisted one-piece cylinder and work system |
| WO2020113952A1 (en) * | 2018-12-03 | 2020-06-11 | 三一汽车制造有限公司 | Pumping mechanical hydraulic system |
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